FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the invention: COLD FORMING MACHINE
2. Applicant(s)
NAME NATIONALITY ADDRESS
TAL MANUFACTURING SOLUTIONS LIMITED Indian PDO Building, Tata Motors Campus, Chinchwad Pune, India
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

TECHNICAL FIELD
[0001] The subject matter described herein, in general, relates to cold forming, and in particular relates to a cold forming machine and a method for operating the cold forming machine.
BACKGROUND
[0002] Sheet metal rolling is a very common though vital process in aerospace manufacturing industry. The sheet metal rolling is a process in which a sheet metal is bent along an axis under a pre-set pressure, a pre-set speed and roller adjustments. The process alters a material from the sheet to a shell as the sheet metal passes through a series of rollers achieving desired product requirements.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The following detailed description references the drawings, wherein:
[0004] FIG. 1 shows a front sectional view of a cold rolling machine, as per an implementation of the present subject matter;
[0005] FIG. 2 shows a side sectional view of the cold rolling machine, as per an implementation of the present subject matter;
[0006] FIG.3 shows a side sectional view of the cold rolling machine indicating rollers adjustments directions, during operation, as per an implementation of the present subject matter;
[0007] FIG.4 shows a front partial perspective view of the cold rolling machine having a handle, as per an implementation of the present subject matter; and
[0008] FIG.5 shows a front perspective view of the cold rolling machine, as per an implementation of the present subject matter.
[0009] Conventional roll bending machines have thickness and process limitations to achieve desired level of precision and repeatability as per aerospace product requirements. The number of processing steps to achieve the desired outcome affects the physical and material properties, which in turn adversely affects the final material integrity and component requirements. The physical, material and dimensional requirements add to the criticality as thin sheets are converted to the required rolled part. The rolling process for aerospace sector becomes extremely critical and stringent due to the involvement of flying parts and product integrity requirements throughout the engine life cycle.
[0010] The conventional roll bending machine comprises three rollers. One roller of the three rollers is a master roller and two rollers of the three rollers are side rollers. The master roller is adjustable and the two side rollers are fixed. The fixed side rollers are slave rollers. The diameter of the master roller is greater than the diameters of the slave rollers. Further, a pre-set distance between the master and the slave rollers and a pre-set rolling pressure from the master roller are used to achieve the required dimensions of an end product. In operation, a thin sheet is loaded between the master roller and the slave rollers and the master roller is pressed with the pre-set pressure against the thin sheet to be bent. Based on the initial adjustment of the pre-set distance between the master and the slave rollers as per the end product dimensional requirements, the rollers are rotated to complete first pass. Once the initial shape of the thin sheet is achieved, the thin sheet is repeatedly passed between the master roller and the slave rollers until required rolled end product is obtained.
[0011] However, due to very high strength to density ratio for aerospace materials like Titanium, the rolling process with conventional cold rolling machines becomes extremely difficult due to variety of issues like spring back, strain hardening of material, physical distortion etc. During the rolling process establishment, the spring back behaviour is difficult to estimate and can only be compensated to get required quality of the end product. In the conventional rolling machines, the master roller gets damaged while operating on the high spring back materials.
[0012] Further, the end product requirements like low thickness and required diameter after the cold rolling and surface condition requirements after the cold rolling make the rolling process highly challenging and difficult. Due to such problems with the conventional rolling machines, achieving required diameter of the end product is difficult. Further, the conventional rolling machines can be used for very limited thickness of sheet material and can be used to achieve limited range of diameter of end products.
[0013] To this end, a cold rolling machine is proposed, which results into efficient processing of sheet materials with extremely low effect on material properties and gives a desired assembly set up very precisely and repetitively.
[0014] An implementation of the present subject matter describes that the cold rolling machine includes a base supporting frame, a first side supporting frame disposed on the base supporting frame, a second side supporting frame disposed on the base supporting frame at a distance from the first side supporting frame, and a third side supporting frame disposed on the second side supporting frame. Further, a driver master roller, to apply a pre-set pressure on a sheet metal, is disposed on a first shaft coupled between the first side supporting frame and the third side supporting frame. A first driven side roller is positioned below the driver master roller and offset to one side of the driver master roller. The first driven side roller is disposed on a second shaft coupled between the first side supporting frame and the second supporting frame. A second driven side roller is positioned below the driver master roller and offset to another side of the driver master roller. The second driven side roller is disposed on a third shaft coupled between the first side supporting frame and the second side supporting frame. The first driven side roller and the second driven side roller are to move the sheet metal after application of the pre-set pressure by the driver master roller. Further, a driven clamping roller is positioned below the first driven side roller and the second driven side roller. The driven clamping roller is disposed on a fourth shaft coupled between the first side supporting frame and the second side supporting frame. The driven clamping roller is to support the sheet metal from bottom.
[0015] In an implementation of the present subject matter, positions of the driver master roller, the first driven side roller, the second driven side roller and the driven clamping roller are adjustable with respect to each other. In one example, the cold rolling machine is a cold forming machine.
[0016] Another implementation of the present subject matter discloses a method for operating the cold rolling machine. Considering specific end product dimensional requirement, the driver master roller, the first driven side roller, the second driven side roller and the driven clamping roller are set to respective initial positions. Further, the driver master roller may be set at a prespecified distance from a top end of the first slider and a top end of the second slider for a first pass of the sheet metal. The first driven side roller may be set at a prespecified distance from a side most end of a third slider and a side most end of a fourth slider for the first pass of the sheet metal. The second driven side roller may be set at a prespecified distance from a side most end of the fifth slider and a side most end of a sixth slider for the first pass of the sheet metal. The driven clamping roller may be further set at a prespecified distance from a lower end of a seventh slider and a lower end of an eighth slider for the first pass of the sheet metal.
[0017] The sheet metal may be passed via the driver master roller, the first driven side roller, the second driven side roller and the driven clamping roller, and the driver master roller exerts a specific pressure onto the passing sheet metal for bending of the passing sheet metal during the first pass of the sheet metal.
[0018] Further, the driver master roller may be set at another prespecified distance from the top end of the first slider and the top end of the second slider for a subsequent pass of the sheet metal. Further, the first driven side roller may be set at the another prespecified distance from the side most end of the third slider and the side most end of the fourth slider for the subsequent pass of the sheet metal, and the second driven side roller may be set at the another prespecified distance from the side most end of the fifth slider and the side most end of the sixth slider for the subsequent pass of the sheet metal. Furthermore, the driven clamping roller may be set at the another prespecified distance from the lower end of the seventh slider and the lower end of the eighth slider for the subsequent pass of the sheet metal.
[0019] Further, the sheet metal is passed via the driver master roller, the first driven side roller, the second driven side roller and the driven clamping roller. The driver master roller exerts another specific pressure onto the passing sheet metal for bending of the passing sheet metal. Further, the bend sheet metal may be unloaded from the cold rolling machine by detaching a third side supporting frame.
[0020] In one implementation of the present subject matter, the cold rolling machine is designed in such a way that only single variable is involved to ensure process repeatability and product integrity requirements. Hence, the cold rolling machine of the present subject matter controls only distance which in turn help to maintain particular pressure depending upon the final dimensions to be achieved.
[0021] The subject matter described in the previous embodiments can be embodied in many ways as would be obvious to a person skilled in the art. For example, the components of the cold rolling machine can be made in different shapes and sizes. The dimensions of the sliders can be same or different as known to a person skilled in the art.
[0022] With the above disclosed implementations of the present subject matter, the cold rolling machine may bend thin aerospace grade sheets like Titanium and Alloy Steels into rolls of lower diameters. In one example, the cold rolling machine may bend thin aerospace grade sheets like Titanium and Alloy Steels having thickness up to 0.91 mm into rolls of diameters as low as 100 mm. In another example, the cold rolling machine of the present subject matter may achieve the dimensional requirements within 50 microns. The number of processing steps as per the dimensional requirements of the end product are reduced from 20-25 to 1-3, when compared with the conventional cold rolling
machines without affecting the product integrity requirements and ultimately minimise the material wastage, time, and cost incurred thereof. [0023] The cold rolling machine of the present subject matter may be used for different grades of Aerospace materials. The cold rolling machine of the present
# subject matter is portable that easily sits in an area of 1000 mm * 1000 mm and require no energy consumption for the operation. The cold rolling machine of the present subject matter can be used for variety of sheet thickness, material grades and can achieve large range of diameter products/parts. The four rollers of the cold rolling machine of the present subject matter are adjustable and thus leads to
# accommodate variety of parts to be processed. [0024] These and other advantages of the present subject matter would be described in a greater detail in conjunction with the FIGS. 1-5 in the following description. The manner in which the cold rolling machine is implemented and used shall be explained in detail with respect to the FIGS. 1-5.
# [0025] It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope. Furthermore, all examples recited herein are intended only to aid
# the reader in understanding the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects and implementations of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0026] FIG. 1 shows a front sectional view of a cold rolling machine 100, as
# per an implementation of the present subject matter, and FIG. 2 shows a side sectional view of the cold rolling machine 100, as per an implementation of the present subject matter. FIG. 1 and FIG. 2 are described in conjunction with each other hereinafter. In one example, the cold rolling machine 100 is a cold forming machine 100. The cold rolling machine 100 includes a base supporting frame 102,
# a first side supporting frame 104 disposed on the base supporting frame 102, a second side supporting frame 106 disposed on the base supporting frame 102 at adistance from the first side supporting frame 104, and a third side supporting frame 108. The third side supporting frame 108 is disposed on the second side supporting frame 106 and is detachable. In one example, the third side supporting frame 108 is detachable for unloading of the end product. In one example, the base supporting frame 102 is a base plate. Further, the cold rolling machine 100 includes a driver master roller 110, a first driven side roller 112, a second driven side roller 202 and a driven clamping roller 114, which cold form very low thickness aerospace grade Titanium and Alloy Steels into rolls. In one example, the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114 may be collectively referred to as rollers. The driver master roller 110 applies a pre-set pressure on a sheet metal (not shown) to be rolled. The driver master roller 110 is disposed on a first shaft 204 coupled between the first side supporting frame 104 and the third side supporting frame 108. In one example, the driver master roller 110 is an uppermost roller of the cold rolling machine 100.
[0027] The first driven side roller 112 is positioned below the driver master roller 110 and offset to one side of the driver master roller 110. The first driven side roller 112 is disposed on a second shaft 206 coupled between the first side supporting frame 104 and the second supporting frame 106. The first driven side roller 112 is a slave roller and is freely rotatable. The first driven side roller 112 is to move the sheet metal out of the cold rolling machine 100 after application of the pre-set pressure by the driver master roller 110.
[0028] Further, the second driven side roller 202 is positioned below the driver master roller 110 and offset to another side of the driver master roller 110. The second driven side roller 202 is disposed on a third shaft 208 coupled between the first side supporting frame 104 and the second side supporting frame 106. The second driven side roller 202 is a slave roller and is freely rotatable. The second driven side roller 202 is to move the sheet metal out of the cold rolling machine 100 after application of the pre-set pressure by the driver master roller 110.
[0029] Furthermore, the driven clamping roller 114 is positioned below the first driven side roller 112 and the second driven side roller 202. The driven clamping roller 114 is disposed on a fourth shaft 210 coupled between the first side supporting frame 104 and the second side supporting frame 106. The driven clamping roller 114 is a slave roller and is freely rotatable. The driven clamping roller 114 supports the sheet metal from bottom when passing through the cold rolling machine 100. The driven clamping roller 114 is a lowermost roller of the cold rolling machine 100.
[0030] In an implementation of the present subject matter, the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114 are adjustable in terms of their position with respect to each other, based on the thickness and specific dimensional requirements of an end product to be obtained after cold rolling of the sheet metal.
[0031] In one implementation of the present subject matter, the diameter of the driver master roller 110 is smaller than the diameter of the first driven side roller 112 and the diameter of the second driven side roller 202. In one example, the diameter of the driver master roller 110 is smaller than the diameter of the driven clamping roller 114.
[0032] During operation of the cold rolling machine 100, the driver master roller 110 applies the pre-set pressure on the sheet metal to conduct the rolling operation. The first driven side roller 112 and the second driven side roller 202 move the sheet metal after application of the pre-set pressure from the driver master roller 110. Further, the driven clamping roller 114 is used for supporting the sheet metal from the bottom. The driven clamping roller 114 is an additional attachment given to support the sheet metal and to reduce the overhang of the sheet metal to be rolled. In one example, during the operation of the cold rolling machine 100, the driver master roller 110 rotates in clockwise direction and at the same time the s first driven side roller 112 and the second driven side roller 202 rotate in an anti-clockwise direction. The driver master roller 110 is synchronized with the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114 in such a way that centres of all rollers form a quadrilateral structure at steady state. For obtaining a desired roller part, the quadrilateral structure at steady state is necessary. The first driven side roller 112 and the second driven side roller 202 are used for setting diameters, and the driven clamping roller 114 is used for supporting the sheet metal.
[0033] The first side supporting frame 104, the second side supporting frame 106 and the third side supporting frame 108 are directly or indirectly disposed on the base supporting frame 102 along with the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114. The base supporting frame 102 supports the entire cold rolling machine 100. The first side supporting frame 104 is a complete one frame which supports all four rollers from one side. The third side supporting frame 108 is supported by a swing arm 118 and a clamp (not shown) with the help of a hinge pin (not shown). The detachable third side supporting frame 108 ensures that the finished end product is safely unloaded from the driver master roller 110. The detachable third side supporting frame 108 ensures safety to the cold rolling machine 100.
[0034] In one example, not necessarily, but the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114 are made up of case-hardened steel. The rollers made of the case-hardened steel ensures good surface finish to the end product. The case-hardened steel increases durability and repeatability of the rollers. Further, crack propagation of rollers is avoided by the usage of the case-hardened steel. The rollers made of the case-hardened steel improve creep and fatigue strength and enhances wear resistance properties of the rollers.
[0035] In an implementation of the present subject matter, the cold rolling machine 100 includes spherical bearings (not shown) for free movement of the rollers. The spherical bearings are beneficial for cone rolling and are adjusted easily with required angles. The spherical bearings permit the rotation of rollers
with low friction and permit better roller settings. The spherical bearings are capable of heavy load carrying capacity.
[0036] Further, the cold rolling machine 100 includes a first slider 212, a second slider (not shown), a third slider 214, a fourth slider (not shown), a fifth slider 216, a sixth slider (not shown), a seventh slider 218 and an eighth slider (not shown) for adjusting the positions of the rollers with respect to each other. The first side supporting frame 104 includes the first slider 212, which is connected to one end of the first shaft 204, the third slider 214 connected to one end of the second shaft 206, the fifth slider 216 connected to one end of the third shaft 208 and the seventh slider 218 connected to one end of the fourth shaft 210. Further, the second side supporting frame 106 includes a fourth slider connected to another end of the second shaft 206, the sixth slider connected to another end of the third shaft 208, and the eighth slider connected to another end of the fourth shaft 210. Furthermore, the third side supporting frame 106 includes the second slider connected to another end of the first shaft 204.
[0037] The cold rolling machine 100 further includes respective slots within the respective frames for each of the first slider 212, the second slider, the third slider 214, the fourth slider, the fifth slider 216, the sixth slider, the seventh slider 218 and the eighth slider so that each of the first slider 212, the second slider, the third slider 214, the fourth slider, the fifth slider 216, the sixth slider, the seventh slider 218 and the eighth slider may slide within the respective slot for adjusting the position of the respective roller within the cold rolling machine 100.
[0038] In an implementation of the present subject matter, the cold rolling machine 100 includes a first nut and screw arrangement 220, a second nut and screw arrangement (not shown), a third nut and screw arrangement 222, a fourth nut and screw arrangement (not shown), a fifth nut and screw arrangement 224, a sixth nut and screw arrangement (not shown), a seventh nut and screw arrangement 226, and an eighth nut and screw arrangement (not shown), which can be collectively referred to as nut and screw arrangements.
[0039] In an example, the first side supporting frame 104 includes the first nut and screw arrangement 220 coupled to the first slider 212 to control sliding movement of the first slider 212 within the respective slot of the first side supporting frame 104, the third nut and screw arrangement 222 coupled to the third slider 214 to control sliding movement of the third slider 214 within the respective slot of the first side supporting frame 104, the fifth nut and screw arrangement 224 coupled to the fifth slider 216 to control sliding movement of the fifth slider 216 within the respective slot of the first side supporting frame 104, and the seventh nut and screw arrangement 226 coupled to the seventh slider 218 to control sliding movement of the seventh slider 218 within the respective slot of the first side supporting frame 104.
[0040] Further, the second side supporting frame 106 includes the fourth nut and screw arrangement coupled to the fourth slider to control sliding movement of the fourth slider within the respective slot of the second side supporting frame 106, the sixth nut and screw arrangement coupled to the sixth slider to control sliding movement of the sixth slider within the respective slot of the second side supporting frame 106, and the eighth nut and screw arrangement coupled to the eighth slider to control sliding movement of the eighth slider within the respective slot of the second side supporting frame 106.
[0041] Furthermore, the third side supporting frame 108 includes the second nut and screw arrangement coupled to the second slider to control sliding movement of the second slider within the respective slot of the third side supporting frame 108.
[0042] In one example, the nut and screw arrangements may be controlled using a spanner (not shown). In one example, a hand knob (not shown) may be used for sliding the respective slider in the respective slot. Such an arrangement leads to a sliding movement of the rollers.
[0043] In an implementation of the present subject matter, the first supporting frame 104 may include a handle 402 as clearly depicted in FIG. 4. FIG.4 shows a front partial perspective view of the cold rolling machine 100. In FIG. 4, the first side supporting frame 104 includes the handle 402. The handle 402 may be attached to one end of the first shaft 118 of the driver master roller 110. In operation, the first shaft 118 of the driver master roller 110 may be manually rotated using the handle 402 for cold rolling the sheet metal. In one example, the first shaft 204 of the driver master roller 110 may be connected to an electric motor (not shown) on one end, which can electrically rotate the first shaft 204 of the driver master roller 110 for cold rolling the sheet metal. In one example, FIG. 4 depicts the first side supporting frame 104 which is a complete one frame which supports all four rollers on one side and is disposed on the base supporting frame 102.
[0044] Further FIG.3 shows the side sectional view of the cold rolling machine 100 indicating rollers adjustments directions, during operation, as per an implementation of the present subject matter. While operation of the cold rolling machine 100, the thickness of the sheet metal and required bend radius (product diameter) to be rolled control the distance adjustments between the driver master roller 110 and the first and second driven side rollers 112, 202. To this end, a sheet bending angle controls the diameter of an end product 302. In one example, for achieving more bending angle (Lesser the end product diameter), distance between the driver master roller 110 and the first and second driven side rollers 112, 202 is reduced. In another example, for achieving lesser bending angle (More the end product diameter), distance between the driver master roller 110 and the first and second driven side rollers 112, 202 is increased. Different possibilities of the rollers movements are shown in FIG. 3 by arrows 304-1, 2, 3 and 4.
[0045] Based on the thickness of the sheet metal and the required bending radius of the sheet metal, the rollers can slide forward and backward. The sliding of the rollers may be controlled by the nut and screw arrangements. In one example, for less thickness and more bending radius of the sheet metal, the rollers are to be moved forward so that the distance between the rollers is minimum as per the pre-specified requirements. In another example, for more thickness and less bending radius of the sheet metal, the rollers are to be moved backward so that the distance between the rollers is predominately large. In yet another example, for the sheet metal carrying high spring back property, the distance between the rollers is adjusted so that the sheet metal may be deformed plastically. Further, for sheet metal having high spring back property, the distance between the rollers is optimal or sheet metal is to be over bend, which requires the master roller to slide in the downward direction.
[0046] FIG.5 shows a perspective view of the cold rolling machine 100, as per an implementation of the present subject matter. FIG.5 depicts the disposition of the first side supporting frame 104 on the base supporting frame 102, the second side supporting frame 106 on the base supporting frame 102 at a distance from the first side supporting frame 104, the third side supporting frame 108 on the second side supporting frame 106. The first driven side roller 112 is shown coupled to a first-hand knob 502 and a second-hand knob 504 for controlling the third slider 204 and the fourth slider connected thereto.
[0047] The cold rolling machine 100 of FIGS. 1-5 may be operated as per an implementation of the present subject matter. In an exemplary operation of the cold rolling machine 100 of the present subject matter, considering specific end product dimensional requirement, the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114 are set to respective initial positions.
[0048] Further, the driver master roller 110 may be set at a prespecified distance from a top end of the first slider 212 and a top end of the second slider for a first pass of the sheet metal. The first driven side roller 112 may be set at a prespecified distance from a side most end of a third slider 214 and a side most end of a fourth slider for the first pass of the sheet metal. The second driven side roller 202 may be set at a prespecified distance from a side most end of the fifth slider 216 and a side most end of a sixth slider for the first pass of the sheet metal. The driven clamping roller 114 may be further set at a prespecified distance from
a lower end of a seventh slider 218 and a lower end of an eighth slider for the first pass of the sheet metal.
[0049] The sheet metal is introduced while rotating the handle manually for the first pass. During the first pass, the sheet metal may be passed via the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114. The driver master roller 110 exerts a specific pressure onto the passing sheet metal for bending of the passing sheet metal. Further, the bend sheet metal may be taken out from the cold rolling machine 100.
[0050] For a subsequent pass of the sheet metal, the driver master roller 110 may be set at another prespecified distance from the top end of the first slider 212 and the top end of the second slider. Further, the first driven side roller 112 may be set at the another prespecified distance from the side most end of the third slider 214 and the side most end of the fourth slider for the subsequent pass of the sheet metal, and the second driven side roller 202 may be set at the another prespecified distance from the side most end of the fifth slider 216 and the side most end of the sixth slider for the subsequent pass of the sheet metal. Furthermore, the driven clamping roller 114 may be set at the another prespecified distance from the lower end of the seventh slider 218 and the lower end of the eighth slider for the subsequent pass of the sheet metal.
[0051] The sheet metal is further introduced into the cold rolling machine 100 while rotating the handle manually for the subsequent pass. Further, the sheet metal is passed via the driver master roller 110, the first driven side roller 112, the second driven side roller 202 and the driven clamping roller 114. The driver master roller 110 exerts another specific pressure onto the passing sheet metal for bending of the passing sheet metal. Further, the bend sheet metal may be taken out from the cold rolling machine 100 may be unloaded from the cold rolling machine 100 by detaching a third side supporting frame 108.
[0052] In one example, the distance of the driver master roller 110 is further adjusted for second pass and the distance of the driver master roller 110 is furthermore adjusted for third pass. For all the passes of the sheet metal through the rollers, the handle is rotated manually, which rotate the driver master roller 110 for carrying out the operation. In one example, the distance of the driver master roller 110 can be further adjusted for subsequent passes of the sheet metal from the rollers.
[0053] In one example, for obtaining a roll having 152.04 mm outer diameter, the pre-set distance of the driver master roller 110 is at 27.5 mm from the top end of the respective sliders for first pass, 30 mm for second pass and 32.5 mm for third pass, and the pre-set distances of the driven side rollers 112, 202 are at 75 mm from the respective side most ends of the respective sliders. In another example, for obtaining a roll or a shell having 136.05 mm outer diameter, the pre¬set distance of the driver master roller 110 is 28.5 mm from the top end of the respective slider for first pass, 30.5 mm for second pass, and 33.4 mm for third pass, and the pre-set distances of the driven side rollers 112, 202 are at 75 mm from the respective side most ends of the respective sliders.
[0054] Although implementations for the cold rolling machine are described, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features are disclosed as implementations.

I/We Claim:
1. A cold rolling machine (100) comprising:
a base supporting frame (102);
a first side supporting frame (104) disposed on the base supporting frame (102);
a second side supporting frame (106) disposed on the base supporting frame (102) at a distance from the first side supporting frame (104);
a third side supporting frame (108) disposed on the second side supporting frame (106);
a driver master roller (110) to apply a pre-set pressure on a sheet metal, wherein the driver master roller (110) is disposed on a first shaft (204) coupled between the first side supporting frame (104) and the third side supporting frame (108);
a first driven side roller (112) positioned below the driver master roller (110) and offset to one side of the driver master roller (110), wherein the first driven side roller (112) is disposed on a second shaft (206) coupled between the first side supporting frame (104) and the second supporting frame (106);
a second driven side roller (202) positioned below the driver master roller (110) and offset to another side of the driver master roller (110), wherein the second driven side roller (202) is disposed on a third shaft (208) coupled between the first side supporting frame (104) and the second side supporting frame (106), wherein the first driven side roller (112) and the second driven side roller (202) are to move the sheet metal after application of the pre-set pressure by the driver master roller (110); and
a driven clamping roller (114) positioned below the first driven side roller (112) and the second driven side roller (202), wherein the driven clamping roller (114) is disposed on a fourth shaft (210) coupled between the first side supporting frame (104) and the second side supporting frame (106), wherein the driven clamping roller (114) is to support the sheet metal from bottom;
wherein positions of the driver master roller (110), the first driven side roller (112), the second driven side roller (202) and the driven clamping roller (114) are adjustable with respect to each other.
2. The cold rolling machine (100) as claimed in claim 1, wherein the diameter of the driver master roller (110) is smaller than the diameter of the first driven side roller (112) and the diameter of the second driven side roller (202).
3. The cold rolling machine (100) as claimed in claim 1, wherein the diameter of the driver master roller (110) is smaller than the diameter of the driven clamping roller (114).
4. The cold rolling machine (100) as claimed in claim 1, wherein the driver master roller (110), the first driven side roller (112), the second driven side roller (202) and the driven clamping roller (114) are made of case-hardened steel.
5. The cold rolling machine (100) as claimed in claim 1, wherein the third supporting frame (108) is detachable.
6. The cold rolling machine (100) as claimed in claim 1, wherein the first side supporting frame (104) comprises a first slider (212) connected to one end of the first shaft (204), wherein the third side supporting frame (108) comprises a second slider connected to another end of the first shaft (204), and wherein the first slider (212) and the second slider are to adjust the position of the driver master roller (110).
7. The cold rolling machine (100) as claimed in claim 1, wherein the first side supporting frame (104) comprises a third slider (214) connected to one end of the second shaft (206), wherein the second side supporting frame (106) comprises a fourth slider connected to another end of the second shaft (206), and wherein the third slider (214) and the fourth slider are to adjust the position of the first driven side roller (112).
8. The cold rolling machine (100) as claimed in claim 1, wherein the first side supporting frame (104) comprises a fifth slider (216) connected to one end of the third shaft (208), wherein the second side supporting frame (106) comprises a sixth slider connected to another end of the third shaft (208), and wherein the fifth slider (216) and the fourth slider are to adjust the position of the second driven side roller (202).
9. The cold rolling machine (100) as claimed in claim 1, wherein the first side supporting frame (104) comprises a seventh slider (218) connected to one end of the fourth shaft (210), wherein the second side supporting frame (106) comprises an eighth slider connected to another end of the fourth shaft (210), and wherein the seventh slider (218) and the eighth slider are to adjust the position of the driven clamping roller (114).
10. The cold rolling machine (100) as claimed in claim 6, wherein the first side
supporting frame (104) comprises a first nut and screw arrangement (220)
coupled to the first slider (212) to control sliding movement of the first slider
(212) within the first side supporting frame (104), and wherein the third side
supporting frame (108) comprises a second nut and screw arrangement coupled to
the second slider to control sliding movement of the second slider within the third
side supporting frame (108).
11. The cold rolling machine (100) as claimed in claim 7, wherein the first side
supporting frame (104) comprises a third nut and screw arrangement (222)
coupled to the third slider (214) to control sliding movement of the third slider
(214) within the first side supporting frame (104), and wherein the second side
supporting frame (106) comprises a fourth nut and screw arrangement coupled to
the fourth slider to control sliding movement of the fourth slider within the second
side supporting frame (106).
12. The cold rolling machine (100) as claimed in claim 8, wherein the first side
supporting frame (104) comprises a fifth nut and screw arrangement (224)
coupled to the fifth slider (216) to control sliding movement of the fifth slider
(216) within the first side supporting frame (104), and wherein the second side
supporting frame (106) comprises a sixth nut and screw arrangement coupled to the sixth slider to control sliding movement of the sixth slider within the second side supporting frame (106).
13. The cold rolling machine (100) as claimed in claim 9, wherein the first side supporting frame (104) comprises a seventh nut and screw arrangement (226) coupled to the seventh slider (218) to control sliding movement of the seventh slider (218) within the first side supporting frame (104), and wherein the second side supporting frame (106) comprises an eighth nut and screw arrangement coupled to the eighth slider to control sliding movement of the eighth slider within the second side supporting frame (106).
14. A method for operating a cold rolling machine (100) as claimed in the claims 1-13, the method comprising:
setting a driver master roller (110), a first driven side roller (112), a second driven side roller (202) and a driven clamping roller (114) to respective initial positions;
setting the driver master roller (110) at a prespecified distance from a top end of a first slider (212) and a top end of a second slider for a first pass of a sheet metal;
setting the first driven side roller (112) at a prespecified distance from a side most end of a third slider (214) and a side most end of a fourth slider for the first pass of the sheet metal;
setting the second driven side roller (202) at a prespecified distance from a side most end of a fifth slider (216) and a side most end of a sixth slider for the first pass of the sheet metal;
setting the driven clamping roller (114) at a prespecified distance from a lower end of a seventh slider (218) and a lower end of an eighth slider for the first pass of the sheet metal;
passing the sheet metal via the driver master roller (110), the first driven side roller (112), the second driven side roller (202) and the driven clamping roller (114);
exerting a specific pressure onto the passing sheet metal, by the driver master roller (110), for bending of the passing sheet metal;
setting the driver master roller (110) at another prespecified distance from the top end of the first slider (212) and the top end of the second slider for a subsequent pass of the sheet metal;setting the first driven side roller (112) at the another prespecified distance from the side most end of the third slider (214) and the side most end of the fourth slider for the subsequent pass of the sheet metal;
setting the second driven side roller (202) at the another prespecified distance from the side most end of the fifth slider (216) and the side most end of the sixth slider for the subsequent pass of the sheet metal;
setting the driven clamping roller (114) at the another prespecified distance from the lower end of the seventh slider (218) and the lower end of the eighth slider for the subsequent pass of the sheet metal;
passing the sheet metal via the driver master roller (110), the first driven side roller (112), the second driven side roller (202) and the driven clamping roller (114);
exerting another specific pressure onto the passing sheet metal, by the driver master roller (110), for bending of the passing sheet metal; and
unloading the bent sheet metal by detaching a third side supporting frame (108).
15. The method as claimed in claim 14, wherein a centre of the driver master roller (110) is synchronized with a centre of the first driven side roller (112), a centre of the second driven side roller (202) and a centre of the driven clamping roller (114) to form a quadrilateral structure at steady state.