Invention titles: process design system, process design method, and process design program
Technical field
[0001]
The present invention relates to a technique for designing a process plan including a die plan in a die forging process.
Background technology
[0002]
In die forging, in which a work piece (hereinafter sometimes referred to as a work) is formed into a predetermined part shape using a press facility, the shape is complicated and the work cannot be filled in the die, and the load is restricted to the press facility. If it is difficult to form in one step due to the above, a multi-step forging process for forming in a plurality of steps is required.
[0003]
In order to execute the multi-process forging process, it is necessary to design the number of processes required for forging and the mold shape used in each process.
[0004]
As a technique related to the design of the forging process, for example, the technique disclosed in Patent Document 1 is known.
Prior art literature
Patent documents
[0005]
Patent Document 1: Japanese Patent Application Laid-Open No. 2008-110398
Outline of the invention
Problems to be solved by the invention
[0006]
When designing a multi-process forging process, the number of processes required to form the parts (hereinafter referred to as the target shape) that are aimed at forging by forging and the die shape used in each process are unknown. In particular, the mold shape has an enormous degree of freedom in design, and it is difficult to design the process including the design of the mold shape.
[0007]
Here, for example, the design of a multi-process forging process for forming the target shape F110 as shown in FIG. 1 from the work F120 as shown in FIG. 2 will be described. Note that FIG. 1 shows a top view, a side view, and a cross-sectional view taken along the line AA of the target shape F110 from above. The target shape F110 has an axisymmetric (symmetrical with respect to the central axis) and a vertically symmetric shape, but this is an example, and the target shape does not have to be axisymmetric and is vertically symmetrical. It does not have to be.
[0008]
For the die used in one process in the multi-process forging process for forming such a target shape F110, the shape to be used in each process is determined from all free curved surfaces if there is no design guideline for the die shape. Since it has to be done, the degree of design freedom is high and the number of steps required for design is enormous. The mold used in one step can be, for example, a shape as shown in FIG.
[0009]
In the design of such a multi-process forging process, the process design including the design of the die is examined by trial and error, and the time required for the design, the molding accuracy of the target shape by the multi-process forging process, and the manufacturing cost are examined. Etc. depended heavily on the know-how of the designer.
[0010]
Due to the decrease in the number of skilled workers in the manufacturing industry in recent years, it is required to be able to easily and appropriately perform process design including mold design.
[0011]
For the problems in the design of such a multi-process forging process, none of the techniques disclosed in Patent Document 1 targets the design of a forging process composed of a plurality of processes. Therefore, it is not possible to use these techniques to design the process including the design of the die in the multi-process forging process.
[0012]
The present invention has been made in view of the above circumstances, and an object thereof is to easily and appropriately determine a process plan constituting a mold forging process for forming a desired target shape and a die plan used in the process plan. It is to provide the technology that can be done.
Means to solve problems
[0013]
In order to solve the above problems, the process design system according to one viewpoint is a process design system including a processor and generating a process plan including one or more steps of forming a work into a predetermined target shape, and the processor is a process design system. Accepting the input of the shape of the work and the target shape, based on the shape of the work and the target shape, determine the process plan including the mold plan to be used in each process, and when deciding the process plan, each process A virtual die composed of a plurality of virtual die blocks is defined, and a simulation of forging by the virtual die in each process of the process plan is executed and analyzed.
The invention's effect
[0014]
According to the present invention, it is possible to easily and appropriately determine a process plan constituting a mold forging process for forming a desired target shape and a die plan to be used in the process plan.
A brief description of the drawing
[0015]
FIG. 1 is a diagram showing an example of a target shape aimed at molding in a multi-process forging process.
[Fig. 2] Fig. 2 is a cross-sectional view of a work before forging and a target shape.
FIG. 3 is a diagram showing an example of a die used in one step of a multi-step forging process.
[FIG. 4] FIG. 4 is a diagram illustrating a type of a partial mold.
FIG. 5 is a diagram illustrating a region of a partial mold in a virtual mold.
FIG. 6 is a diagram showing an example of a virtual mold configured by combining partial molds.
FIG. 7 is a diagram illustrating a die plan used in a process plan of a mold forging process.
FIG. 8 is a cross-sectional view showing a deformation process of a work in a mold forging process.
FIG. 9 is an overall configuration diagram of a computer system according to an embodiment.
FIG. 10 is a block diagram of a process design computer according to an embodiment.
FIG. 11 is a flowchart of a process design process according to an embodiment.
FIG. 12 is a cross-sectional view showing a deformation process of a work when a final target shape is generated from the work through an intermediate target shape.
[Fig. 13] Fig. 13 is a diagram showing an example of a process plan for generating an intermediate target shape from a raw work.
FIG. 14 is a cross-sectional view showing a deformation process of a work in a mold forging process.
Embodiment for carrying out the invention
[0016]
The embodiment will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the invention according to the claims, and all of the elements and combinations thereof described in the embodiments are indispensable for the means for solving the invention. Is not always.
[0017]
Here, in the present specification, forging processing performed on a work using the same die is one step, and for example, the same die is continuously used a plurality of times under other conditions (different temperature conditions, etc.). When the forging process is performed by using the forging process, these multiple forging processes are regarded as one step.
[0018]
The mold shape can be designed based on innumerable free curved surfaces, but if it is designed based on innumerable free curved surfaces, the number of possible mold shapes becomes enormous, and the man-hours required for designing become enormous. Therefore, in the present embodiment, the mold is composed of a plurality of partial molds (virtual mold blocks), and each partial mold has a shape corresponding to any of a plurality of functions, and these partial molds are formed. By combining the molds, a mold (virtual mold) that is a candidate for the mold proposal is created.
[0019]

Here, with respect to the types of functions (roles) of the partial mold, an example assuming the case of generating the target shape F110 shown in FIG. 1 will be described.
[0020]
FIG. 4 is a diagram illustrating the types of partial molds.
[0021]
As the partial mold, for example, a mold having a partial mold number of 0, 1-1, 2-1, 2-2, and 3 can be considered. It should be noted that these functions are functions required in the mold forging process for generating the target shape F110, and can be extracted with reference to the design results of the past forging process.
[0022]
The function of the partial die with the partial die number "0" is to prevent the partial die from coming into contact with the work intentionally in consideration of the reduction of the load (forging load) in the forging of the press equipment and the fluidity of the work. Is. The function of the partial mold having the partial mold number “1-1” is a function of transforming the work into the shape of the region of the target shape corresponding to the partial mold. The shape of the partial mold having this function is a transfer of the shape of the region of the corresponding target shape. The function of the partial mold having the partial mold number “2-1” is a function of expanding the diameter of the work without causing the work to be deformed to the target shape F110. The shape of the partial mold having this function is, for example, a flat shape. The function of the partial mold of the partial mold number "2-2" is a function of expanding the diameter of the work without transferring the work to the target shape F110. The shape of the partial mold having this function is, for example, a tapered shape. The function of the partial mold of the partial mold number “3” is a function of restraining the deformation of the work in the radial direction.
[0023]
By appropriately assigning these functions to the partial mold, it is possible to generate the mold plan required in the process of generating the target shape F110. Further, by combining a plurality of partial molds having any one of these functions, it is possible to generate molds that are candidates for mold proposals in a limited number to some extent. As a result, it is possible to reduce the calculation process for determining the mold plan described later, and it is possible to shorten the calculation time. From a different point of view, it can be said that a relatively good mold plan can be effectively generated.
[0024]
The function of the partial mold is not limited to the example shown in FIG. 4, and may be a wide variety of functions.
[0025]

Next, the partial mold in the virtual mold will be explained.
[0026]
FIG. 5 is a diagram illustrating a region of a partial mold in a virtual mold. FIG. 6 is a diagram showing an example of a virtual mold configured by combining partial molds. In addition, each number described on the partial mold (F141 to F145) in FIG. 6 indicates the partial mold number shown in FIG.
[0027]
The region of the partial mold in the virtual mold is determined based on, for example, the region of the target shape F110. In the present embodiment, as shown in FIG. 5, in the target shape F110, at least a part of the portion where the height changes is set as the boundary of the region, and the region (part) of the mold corresponding to the region is used as the partial mold. There is. Specifically, the regions A1 to A5 are designated in order from the center of the target shape F110, and as shown in FIG. 6, the regions of the mold F140 corresponding to those regions (opposing those regions) are designated as the partial molds F141 to F145. .. Specifically, the region A1 corresponds to the partial mold F141, the region A2 corresponds to the partial mold F142, the region A3 corresponds to the partial mold F143, and the region A4 corresponds to the partial mold F143. The mold F144 corresponds to the region A5, and the partial mold F145 corresponds to the region A5. The region A1 has a circular upper surface, the other regions A2 to A5 have an annular upper surface, and the partial molds F141 to F145 corresponding to these regions have the same upper surface. It has become. In this way, if the region of the partial mold corresponds to a circle or an annular shape, the same function can be assigned to the entire partial mold when the target shape is axisymmetric.
[0028]
In the present embodiment, a plurality of virtual molds can be easily generated by associating any of the functions of the partial molds shown in FIG. 4 with the partial molds F141 to F145. In the example of FIG. 6, the partial mold F141 is a partial mold having the function of the partial mold number “0”, and the partial molds F142 and F143 have the function of the partial mold number “1-1”. It is a partial mold, and the partial molds F144 and F145 are partial molds having the function of the partial mold number “2-1”.
[0029]
In the present embodiment, the mold F140 is configured by combining the partial molds F141 to F145, but the mold F140 is a virtual mold used for detecting an appropriate mold plan. It is a type. Therefore, when actually generating the target shape, a mold in which the shape of the mold F140 is integrally molded may be manufactured and used, and a partial mold may be combined like the mold F140. The configured mold may be manufactured and used.
[0030]

Next, an example of a mold forging process plan composed of a plurality of processes for generating the target shape F110 from the work F120 will be described.
[0031]
FIG. 7 is a diagram illustrating a die plan used in the process plan of the mold forging process.
[0032]
The mold forging process plan F145 consists of a forging process (first step) by the mold plan F150, a forging process (second step) by the mold plan F160, and a forging process (third step) by the mold plan F170. It consists of two forging processes.
[0033]
The mold plan F150 is composed of partial molds F151 to F155 corresponding to the areas A1 to A5. A partial mold corresponding to the partial mold number "1-1" is assigned to the partial mold F151, and a partial mold corresponding to the partial mold number "2-1" is assigned to the partial molds F152 to F155. Is assigned. Therefore, the mold plan F150 is a mold having a flat surface on the entire work side.
[0034]
The mold plan F160 is composed of partial molds F161 to F165 corresponding to the areas A1 to A5. A partial mold corresponding to the partial mold number "0" is assigned to the partial mold F161, and a partial mold corresponding to the partial mold number "1-1" is assigned to the partial molds F162 and F163. The partial molds F164 and F165 are assigned partial molds corresponding to the partial mold number “2-1”. Therefore, the mold plan F160 is a mold for transferring the groove shape based on the target shape F110 to the inner peripheral side of the work side.
[0035]
The mold plan F170 is composed of partial molds F171 to F175 corresponding to the areas A1 to A5. A partial mold corresponding to the partial mold number "0" is assigned to the partial molds F171 to F173, and a partial mold corresponding to the partial mold number "1-1" is assigned to the partial mold F174. The partial mold F175 is assigned a partial mold corresponding to the partial mold number “3”. Therefore, the mold plan F170 is a mold that realizes shape transfer of the outer peripheral portion of the work and deformation restraint of the outermost peripheral portion.
[0036]
The amount of the die (the amount of sandwiching the upper and lower dies) corresponding to the die plan of each process is the amount of the work realized by pushing with the partial die corresponding to the partial die number "1-1". The pushing amount required to make the thickness the same as the target shape F110 is set.
[0037]
Next, the deformation process of the work according to the mold forging process plan F145 shown in FIG. 7 will be described.
[0038]
FIG. 8 is a cross-sectional view showing the deformation process of the work in the mold forging process.
[0039]
First, in the first step using the die corresponding to the die plan F150, the work F120 before forging is deformed into the shape of the work F190. Specifically, in the first step, the region A1 of the work F120 is formed into the shape of the target shape F110 by the partial mold F151 of the partial mold number “1-1”, and the partial mold number “2-1”. By the partial molds F152 to F155, the regions A2 to A5 are not formed into the shape of the target shape F110, and the diameter is expanded.
[0040]
Next, in the second step using the mold corresponding to the mold plan F160, the work F190 is deformed into the shape of the work F200. Specifically, in the second step, the regions A2 and A3 of the work F190 are formed into the shape of the target shape F110 by the partial molds F162 and F163 of the partial mold number "1-1", and the partial mold number " By the partial molds F164 and F165 of 2-1 ”, the regions A4 and A5 are not formed into the shape of the target shape F110, and the diameter is expanded. In the region A1 formed into the target shape F110 in the first step, the partial die F161 having the partial die number “0” does not come into contact with the work F190, so that the effect of reducing the load in the press mechanism can be obtained. Be done.
[0041]
Next, in the third step using the mold corresponding to the mold plan F170, the work F200 is deformed into the shape of the work F210, that is, a shape that matches the target shape F110. Specifically, in the second step, the region A4 is formed into the shape of the target shape F110 by the partial mold F174 of the partial mold number “1-1”, and the partial mold F175 of the partial mold number “3” is formed. As a result, the region A5 is restrained from being deformed in the radial direction, and the outermost peripheral portion is formed. In the regions A1 to A3 already formed into the target shape F110 in the first step and the second step, the partial dies F171 to F173 having the partial die number "0" do not come into contact with the work F200, so that they are pressed. The effect of reducing the load in the mechanism can be obtained.
[0042]

Next, the configuration of the computer system according to the embodiment will be described.
[0043]
FIG. 9 is an overall configuration diagram of a computer system according to an embodiment.
[0044]
The computer system F10 includes a process design computer F40 as an example of a process design system, a management computer F20, and one or more display computers F30. The process design computer F40 and the management computer F20 are connected to each other via the network F11. Further, the process design computer F40 and the display computer F30 are connected to each other via the network F11.
[0045]
The process design computer F40 is, for example, a server equipped with a storage resource F44 (see FIG. 10) and a CPU F41 (see FIG. 10) at a minimum, and a process design program F441 (see FIG. 10) described later is installed. The storage resource F44 stores CAD data indicating the work shape and target shape, which are input conditions of the process design program F441, calculation execution conditions, a schematic diagram of the process plan after calculation execution, and an analysis result file of finite element analysis. Has been done.
The management computer F20 is a computer used by the system administrator of the process design computer F40. By using the management computer F20, the system administrator monitors the storage medium capacity of the process design computer F40, the usage rate of each user, and the like, and operates the service.
[0046]
The display computer F30 is a computer used by a user who uses the process design computer F40. The display computer F30 accesses the process design computer F40, and the multi-process automatic design conditions input by the user to the GUI F442 (see FIG. 10) of the process design computer F40, and the maximum value of the allowable forging load. Information in text format such as, and CAD data such as target shape and work shape are transmitted. The conditions input by the user are stored in the storage resource F44 of the process design computer F40, and the process design computer F40 performs the process design based on the stored data. Further, the display computer F30 displays the process plan obtained as a result of the process design via the GUI F442 of the process design computer F40. As a result, the process plan can be viewed by the user.
[0047]
<< Hardware >>
Next, the configuration of the process design computer according to one embodiment will be described.
[0048]
FIG. 10 is a configuration diagram of a process design computer according to an embodiment.
[0049]
The process design computer F40 is, for example, a personal computer and a general-purpose computer. The process design computer F40 includes a CPU F41 as an example of a processor, a network interface F42 (abbreviated as Net I / F in the figure), a user interface F43 (User I / F in the figure), and a storage resource F44 as an example of a storage unit. And the internal network connecting these components.
[0050]
The CPU F41 can execute the program stored in the storage resource F44. The storage resource F44 stores a program to be executed by the CPU F41, various information used in this program, CAD data, and the like. In this embodiment, the storage resource F44 stores the process design program F441. The storage resource F44 may be, for example, a semiconductor memory, a flash memory, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or the like, and may be a volatile type memory or a non-volatile type memory.
[0051]
The network interface F42 is an interface for communicating with an external device (for example, a management computer F20, a display computer F30, etc.) via the network F11.
[0052]
The user interface F43 is, for example, a touch panel, a display, a keyboard, a mouse, or the like, but may be another device as long as it can accept operations from a worker (user) and display information. The user interface F43 may be composed of these a plurality of devices.
[0053]
<<< Program that runs on the process design computer >>>

The process design program F441 includes a GUI (Graphical User Interface) F442, an optimum process determination module F443, and an optimum process design module F444.
[0054]
The GUI F442 is executed by the CPU F41 to perform input processing of design conditions and presentation processing of a process plan satisfying a target value.
[0055]
The GUI F442 displays the design condition input screen and accepts the input of the following information. It is not necessary to accept the input of each information or some items of each information.
* Maximum number of processes to design in process design
* Definition of design variables, for example, type of partial mold, allocation area of ​​partial mold
* Specifying the finite element simulation solver to be used
* Work shape
* Target shape. The target shape is the target shape in the design of this process plan, and may be the shape of the final product in the forging process, or may be an intermediate target shape (intermediate target shape) in the forging process.
* Definition of objective function. As the definition of the objective function, for example, an evaluation method such as minimizing the shape error between the forged shape forged in the process plan and the target shape and minimizing the forging load may be specified.
* Constraints. The constraint conditions may include, for example, the forging load of the press mechanism to be used, the wear of the die, and the like.
* Maximum number of calculations for finite element simulation
* Mesh size in finite element simulation
* Target value. The target value is an evaluation value related to the objective function, and is, for example, an allowable shape error value (for example, a maximum value), a forging load value allowed in the press mechanism (for example, a maximum value), and the like.
[0056]
Further, the GUI F442 presents a result screen for a process plan that satisfies the target value by being executed by the CPU F41. The result screen may include the following information.
* A diagram showing the outline of the obtained process plan
* A link to the analysis result file (link for viewing) to display the outline process plan in detail. The user can access the analysis result file by selecting the browsing link by the display computer F30, and can evaluate the contents of the analysis result (for example, forging load, stress, strain, etc.). Access to the analysis result file and evaluation of the analysis result may be performed using the result display function of the finite element simulation software in the display computer F30, and spreadsheet software may be used for the text data of the analysis result file. You may use such as.
[0057]
The optimum process determination module F443 is executed by the CPU F41 to specify the number of processes in the process plan and determine whether or not the optimum process is possible. The optimum process determination module F443 specifies a fixed number within the range of the maximum number of processes or less specified by the GUI F442. In the determination of whether or not the optimum process is possible, the optimum process determination module F443 evaluates whether the optimum process determined by the optimum process design module F444 satisfies the target values ​​such as the shape accuracy specified by the GUI F442, thereby performing the optimum process. Is a process plan that satisfies the target value.
[0058]
The optimum process design module F444 is executed by the CPU F41 to generate process information such as a mold shape, generate a finite element model, execute a simulation, and search for an optimum design condition based on the simulation result. Specific processing by the optimum process design module F444 will be described later with reference to FIG.
[0059]
In the process design computer F40, when the GUI F442 receives an input of design conditions and an instruction to start automatic design from the user, the input conditions are passed to the optimum process determination module F443, and the optimum process determination module F443 determines the number of processes. And design conditions to the optimum process design module F444 input. The optimum process design module F444 searches for an optimum process based on the input number of processes and design conditions, and returns the derived optimum process to the optimum process determination module F443. The optimum process determination module F443 returns a process plan that satisfies the target value to the GUI F442 if the returned optimum process satisfies the target value, and makes the result of the returned optimum process available to the user. .. On the other hand, if the optimum process returned by the optimum process design module F444 does not satisfy the target value, the optimum process determination module F443 resets the number of processes (increases the number of processes by 1), and the optimum process design module F444 is reset. Redesign the optimum process based on the number of processes.
[0060]
According to the above process design computer F40, the user can easily design the optimum process by inputting the design conditions to the GUI F442 without trial and error. Moreover, since the GUI F442 is used, the user can perform the operation intuitively.
[0061]
Next, the processing operation in the process design computer F40 according to the embodiment will be described.
[0062]
<< Process design process >>
[0063]
FIG. 11 is a flowchart of the process design process according to the embodiment.
[0064]
The GUI F442 of the process design computer F40 accepts user input about design conditions such as the maximum number of processes, the type of partial mold, the allocation area of ​​the partial mold, and the finite element simulation solver (step (1)). Next, the optimum process determination module F443 sets the number of processes (candidate values) of the processes for determining the optimum process to 1 (an example of the first value) (step (2)), and the optimum process design module F444 is as follows. By executing the iterative process (steps (3-1), (3-2), (3-2)), the process of determining the optimum process is executed (step (3)).
[0065]
In the iterative process, the optimum process design module F444 determines the conditions for the allocation of the partial mold in the iterative process, and generates a mold plan according to the conditions for the allocation of the partial mold (step (3-1)). .. Here, the condition for the allocation of the partial mold is which function the partial mold has for the allocation area of ​​each partial mold to be allocated (set), and in the generation of this condition, The optimum process design module F444 may be performed using an optimization solver, or the allocation conditions may be determined by any method.
[0066]
Next, in the optimum process design module F444, the work thickness in the region of the partial mold to which the partial mold numbers “1-1” and “1-2” of the mold shape are assigned becomes the thickness of the target shape. The condition of the pushing amount of the process is generated (step (3-2)). Next, the optimum process design module F444 analyzes the finite element simulation based on these conditions, and determines the shape error between the forged shape forged by the process according to these conditions and the target shape, the forging load in this process, and the like. Calculate the analysis result (step (3-3)).
[0067]
In step (3), the optimum process design module F444 executes the above-mentioned iterative process and determines the process that minimizes the predetermined target value based on the results obtained by the iterative process. The optimum process in the specified number of processes is derived, and the derived optimum process is notified to the optimum process determination module F443. Here, the target value is, for example, a value related to a shape error with the target shape under the load constraint of the press equipment (target shape accuracy), that is, the degree of coincidence between the shape of the forged work and the target shape. It may be a value related to.
[0068]
Next, the optimum process determination module F443 determines whether or not the notified optimum process satisfies a predetermined target value (target shape accuracy, etc.) (step (4)). As a result, when it is determined that the optimum process does not satisfy the predetermined target value (step (4): No), the optimum process determination module F443 increases the number of processes for determining the optimum process by 1 to perform the optimum process. The process design module F444 is notified (step (5)), and the process proceeds to step (3). As a result, in step (3), the process of determining the optimum process is performed with respect to the value obtained by increasing the number of processes by 1 (an example of the second value).
[0069]
On the other hand, when it is determined that the optimum process satisfies the predetermined target value (step (4): Yes), the optimum process determination module F443 performs the optimum process satisfying the target value in the process. It is passed to the GUI F442 as the optimum process plan, and the GUI D442 presents the process plan to the user by outputting the process plan (step (6)), and ends the process.
[0070]
According to the above process design process, the user can appropriately design the process plan including the mold plan without trial and error. Further, in the present embodiment, the number of processes for deriving the optimum process is set in order from 1, the optimum process is derived with the set number of processes, and it depends on whether or not the derived optimum process satisfies the target value. By making the optimum process plan in the process for obtaining the target shape, the number of processes for obtaining the target shape can be minimized, and the number of processes can be reduced compared to the conventional trial and error process plan. It may be reduced. As a result, it is possible to reduce the cost by reducing the number of dies used for actual processing, and it is possible to shorten the manufacturing lead time by reducing the number of processes.
[0071]

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
[0072]
<< Generation of target shape via intermediate target shape >>
When generating a target shape from a raw work, for example, depending on the forging load of the press mechanism, the target shape may be generated via a predetermined intermediate target shape. For example, when the work F190 cannot be generated from the raw work F120 in one step as shown in FIG. 8, the raw work F120 is once set as an intermediate target shape.
[0073]
FIG. 12 is a cross-sectional view showing the deformation process of the work when the final target shape in the forging process is generated from the work through the intermediate target shape.
[0074]
When the final target shape F110 is generated from the work F120, the intermediate target shape F215 is generated from the work F120 by one or more steps, and the target shape F110 is generated from the intermediate target shape F215 by one or more steps. ..
[0075]
Here, a process for generating a process plan when generating the final target shape F210 in forging from the work F120 via the intermediate target shape F215 will be described.
[0076]
First, the process design computer F40 generates a process plan of the mold forging process for generating the intermediate target shape F215 from the raw work F120 by executing the process design process shown in FIG. Here, in this process design process, instead of the conditions for the target shape and the target shape, the conditions for the intermediate target shape and the intermediate target shape are input.
[0077]
By this process design process, a process plan that is the optimum process for generating the intermediate target shape F215 from the work F120 is determined. According to this process design process, for example, a process plan composed of one process shown in FIG. 13 is determined.
[0078]
FIG. 13 is a diagram showing an example of a process plan for generating an intermediate target shape from a raw work.
[0079]
The process plan F216 is one process, and the mold plan F220 is used in this process. The mold plan F220 is composed of partial molds F221 to F225 corresponding to the regions A1 to A5. The partial molds F221 to F225 are assigned partial molds corresponding to the partial mold number “1-1”. Therefore, the mold plan F220 is a mold having a flat shape on the entire surface on the work side. The pushing amount in this step is the pushing amount required to make the thickness of the work realized by pushing by the partial die corresponding to the partial die number "1-1" the same as the intermediate target shape F215. Set.
[0080] [0080]
Next, the process design computer F40 generates a process plan of the mold forging process for generating the target shape F210 from the intermediate target shape F215 by executing the process design process shown in FIG. Here, in this process design process, an intermediate target shape is input instead of the work shape.
[0081]
By this process design process, a process plan that is the optimum process for generating the target shape F210 from the intermediate target shape F215 is determined. According to this process design process, for example, a process plan F145 composed of three processes shown in FIG. 7 is determined.
[0082]
Next, the process design computer F40 has not yet prepared a process plan that combines a process plan F216 for generating the intermediate target shape F215 from the raw work F120 and a process plan F145 for generating the target shape F210 from the intermediate target shape F215. It is a process plan for generating the target shape F210 from the machining work F120. This process plan consists of four processes using four types of molds F220, F150, F160, and F170, respectively.
[0083]
As explained above, it is possible to easily design a process plan in the process of generating a target shape from an unprocessed work via an intermediate target shape.
[0084]
Next, the deformation process of the work in the process plan that combines the process plan F216 and the process plan F145 will be described.
[0085]
FIG. 14 is a cross-sectional view showing a deformation process of the work in the mold forging process.
[0086]
First, in the first step, a mold corresponding to the mold F220 is used, and the work F120 before processing is transformed into the intermediate target shape F215. Specifically, in the first step, the regions A1 to A5 of the work F120 are formed into the shape of the intermediate target shape F215 by the partial molds F221 to F225 of the partial mold number “1-1”.
[0087]
From now on, as already explained with reference to FIG. 8, the target intermediate shape F215 is formed into the target shape F210 via the work F190 and the work F200.
[0088]
<< Partial mold >>
In the above embodiment, the region of the partial mold is determined based on the target shape, but the region of the partial mold is not limited to this, and may be any region regardless of the target shape. For example, the radial width of the partial mold corresponding to the region on the central side of the target shape may be increased as it is closer to the central axis of the target shape and smaller as it is farther from the central axis. Further, in the above embodiment, the upper surface shape of the partial mold is circular or annular, but the upper surface shape of the partial mold is not limited to this, and may be any shape. For example, the partial mold may be an octahedron (for example, an octahedron having a hexagonal top surface).
[0089]
Further, the number of partial molds in the mold (virtual mold) may be arbitrarily determined. Further, for example, the number of partial molds may be fixedly determined, or when the target value is not satisfied in the process design process (step (4): No), the number is changed to a larger number. May be good.
[0090]
<< Others >>
Further, in the above embodiment, the process design computer F40 is provided with an execution function of the finite element simulation, and an example of using the execution function of the finite element simulation has been shown. However, the present invention is not limited to this, and the present invention is not limited to this. The execution does not necessarily have to be performed in the process design computer F40. For example, the generation of a finite element model is executed by the process design computer F40, and the finite element is generated.As for the simulation, for example, the analysis may be executed using the finite element simulation software already owned by the user in the display computer F30, and the obtained analysis result may be returned to the process design computer F40. In this case, since it is not necessary to execute the finite element simulation in the process design computer F40, the load on the process design computer F40 can be reduced. Further, if the user's cost burden is incurred when the finite element simulation software in the process design computer F40 is executed, the process design computer F40 does not need to execute the finite element simulation software. The cost of using the design computer F40 can be reduced.
[0091]
Further, in the above embodiment, an example in which the process design system is configured by one process design computer F40 is shown, but the present invention is not limited to this, and the process design system may be configured by a plurality of computers. good.
[0092]
For example, the function of the partial mold is not limited to the above embodiment, and may be various functions. For example, it may include a function of aligning the work before forging. By increasing the types of functions of the partial mold, it is possible to determine a process plan including an appropriate mold plan in consideration of operating conditions, formability, material characteristics of the work, and the like.
[0093]
Further, in the above embodiment, the axially symmetric target shape has been described as an example, but the present invention is not limited to this, and can be applied to the case where the target shape is a three-dimensional complicated shape. Further, although the vertically symmetrical target shape has been described as an example, the vertically symmetrical shape does not have to be used. In this case, the shape of the upper mold and the shape of the lower mold may be considered separately. For example, a partial mold of the upper mold and a partial mold of the lower mold may be considered. The width of the corresponding region (width in the radial direction) may be different, or the number of partial molds constituting the mold may be different.
[0094]
Further, in the above embodiment, a part or all of the processing performed by the CPU F41 may be performed by the hardware circuit. Further, the program in the above embodiment may be installed from the program source. The program source may be a program distribution server or a non-volatile storage medium (eg, a portable storage medium).
Code description
[0095]
F10 ... computer system, F11 ... network, F20 ... management computer, F30 ... display computer, F40 ... process design computer, F41 ... CPU, F42 ... network interface, F43 ... user interface, F44 ... storage resource
The scope of the claims
[Claim 1]
It is a process design system equipped with a processor and generating a process plan including one or more processes for forming a work into a predetermined target shape.
The processor is
Accepting the input of the shape of the work and the target shape,
Based on the shape of the work and the target shape, determine the process plan including the mold plan to be used in each process.
When deciding the process plan, a virtual die composed of a plurality of virtual die blocks is defined for each process, and a simulation for forging with the virtual die in each process is executed and analyzed.
Process design system.
[Claim 2]
The process design system according to claim 1.
Multiple roles that can be assigned to the virtual mold block are preset.
The processor is
The shape of the virtual mold block is determined based on the role assigned to the virtual mold block and the target shape.
Process design system.
[Claim 3]
The process design system according to claim 1.
The processor is
The virtual mold in all processes where the analysis result by the simulation satisfies the predetermined target value is determined as the mold plan.
Process design system.
[Claim 4]
The process design system according to claim 3.
The target value is
It is a value related to the degree of coincidence between the shape of the work obtained from the analysis result and the target shape.
Process design system.
[Claim 5]
The process design system according to claim 3.
The processor is
Set as the first value as a candidate value for the number of processes in the process plan,
Define the virtual mold in each process of the number of processes corresponding to the candidate value,
When the analysis result in the number of steps corresponding to the candidate value does not satisfy the predetermined target value, the process is repeated with the second value larger than the first value as a new candidate value.
Process design system.
[Claim 6]
The process design system according to claim 1.
The target shape is symmetrical with respect to the central axis.
The virtual mold block corresponds to a circular or annular region centered on the central axis.
Process design system.
[Claim 7]
The process design system according to claim 2.
The roles that can be assigned to the virtual mold block include at least a plurality of no pressurization on the work, transfer of the target shape to the work, expansion of the diameter of the work, or restraint of deformation of the work in the radial direction.
Process design system.
[Claim 8]
It is a process design method that generates a process plan including one or more processes for forming a work into a predetermined target shape.
Accepting the shape of the work and the target shape,
Based on the shape of the work and the target shape, determine the process plan including the mold plan to be used in each process.
When deciding the process plan, a virtual die composed of a plurality of virtual die blocks is defined for each process, and a simulation for forging with the virtual die in each process is executed and analyzed.
Process design method.
[Claim 9]
The process design method according to claim 8.
Multiple roles that can be assigned to the virtual mold block are preset.
The shape of the virtual mold block is determined based on the role assigned to the virtual mold block and the target shape.
Process design method.
[Claim 10]
The process design method according to claim 8.
The virtual mold in each process for which the analysis result by the simulation satisfies a predetermined target value is determined as a mold plan.
Process design method.
[Claim 11]
The process design method according to claim 10.
The target value is
It is a value related to the degree of coincidence between the shape of the work obtained from the analysis result and the target shape.
Process design method.
[Claim 12]
The process design method according to claim 10.
Set as the first value as a candidate value for the number of processes in the above process plan,
Define the virtual mold in each process of the number of processes corresponding to the candidate value,
When the analysis result in the number of steps corresponding to the candidate value does not satisfy a predetermined target value, the process is repeated with the second value larger than the first value as a new candidate value.
Process design method.
[Claim 13]
The process design method according to claim 8.
The target shape is symmetrical with respect to the central axis.
The virtual mold block corresponds to a circular or annular region centered on the central axis.
Process design method.
[Claim 14]
The process design method according to claim 9.
The roles that can be assigned to the virtual mold block include at least a plurality of no pressurization on the work, transfer of the target shape to the work, expansion of the diameter of the work, or restraint of deformation of the work in the radial direction.
Process design method.
[Claim 15]
A process design program for causing a computer to execute the process design method according to any one of claims 8 to 14.