Claims:WE CLAIM:

1. A device for edge preparation of thin wall pipes with different angle of chamfering comprising bottom guide channel (2) supporting grinding wheel assembly (9), which moves to and fro by ‘V’ guide roller (15) sliding on the flanges of the bottom guide channel (2), wherein the grinding wheel (9) is locked to the desired angle for loading; and

bottom guide channel (14) supporting work piece (11) holding assembly, which moves to and fro by ‘V’ guide roller (16) secured to the flanges of said bottom guide channel (14), in which both the bottom guide channels (2, 14) are placed adjacent to each other.

2. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1, wherein the work piece (11) to be edge prepared is placed on driver wheel (10) at one end and driven wheel (12) at another end.

3. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 2, wherein the work piece (11) is secured to stopper (13) at one extreme end facing away from the grinding wheel (9).

4. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claims 1-3, wherein the grinding wheel (9) is positioned nearer to the work piece by moving the cross way movement stud (1) and locked with loading nut (17).

5. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1-4, wherein the grinding wheel (9) is locked to the desired angle by measuring in the angle measuring plate (4) and locked with the help of the lock nut (5) for loading at the desired angle.

6. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1-5, wherein depending upon the diameter of the work piece (11), the longitudinal control stud with handle (3) is adjusted and when the grinding wheel motor is switched on.

7. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1-6, wherein once the grinding wheel (9) rotates, necessary feed is given by the angular control stand with handle (6) by moving inward until the desired edge preparation is carried out.

8. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1-7 comprises grinding wheel fixing nut (8) that ensures the grinding wheel (9) in horizontal position during the operation.

9. The device for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1-8, comprising cross way movement stud with handle (1) so as to move the grinding wheel assembly perpendicular to the axis of the work piece, in which said stud is self locking stud, and comprising vertical height adjustment nut (7) in order to move the grinding wheel (9) upward and downward at the desired position to suit the various diameter of the work piece (11) to be edge prepared.

10. A method for edge preparation of thin wall pipes with different angle of chamfering as claimed in claim 1 comprising steps of:-

- placement of work piece (11) to be edge prepared on driver wheel (10) and driven wheel (12),
- fixing of stopper (13) at one extreme end of the work piece (11) followed by rotation of the work piece (11) by motor (10),
- locking of grinding wheel (9) to the desired angle,
- positioning of the wheel (9) nearer to the work piece followed by locking of the wheel,
- adjustment of the longitudinal control stud with handle (3) according to the diameter of the workpiece (11),
- giving necessary feed by the angular control stand with handle (6) by moving inward until the desired edge preparation is carried out, once the grinding wheel rotates.
, Description:A device and method for edge preparation of thin wall pipes with different angle of chamfering
FIELD OF INVENTION
[001] The field of invention is in general relating to edge preparation of pipes to make suitable for butt welding. More particularly, the invention relates to edge preparation of thin wall pipes used for water lines in the high pressure steam generators. Still more particularly, the invention relates to a device developed for edge preparation of thin wall pipes with different angle of chamfering.

BACKGROUND OF THE INVENTION

[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[003] The pipelines are used with different length which are to be joined with butt welding methods. It is required to have edge preparation before butt welding of pipes for better joining of metal. There are conventional edge preparation machine for high thickness pipe to make different angles of chamfering known as edge preparation. Otherwise for low thickness pipes called as thin walled pipes are to be chamfered by using conventional lathe or manual grinding process. The conventional lathe process is less productive and using grinding machine is more productive. But Manual grinding process is time consuming and less accurate. Moreover, the process is unsafe to the operator. In the case of mass production, when the number of edge preparation is more, there is a need for alternate method for edge preparation.

[004] In view of the above, a suitable machine/device is required to be developed using grinding wheel for the edge preparation which can be more productive and at the same time, it can avoid the drawback of environment contamination due to chips.

OBJECTS OF THE INVENTION

[005] An object of the invention is to propose a device for edge preparation of thin wall pipes with different angle of chamfering which obviates drawbacks of prior arts.

[006] Another object of the invention is to propose a device for edge preparation of thin wall pipes with different angle of chamfering having low thickness of 6.3 mm to 19 mm.

[007] Still another object of the present invention is to provide a device for edge preparation of thin wall pipes with different angle of chamfering to make different angles of edge preparation ranging from 10 degrees to 170 degrees.

[008] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.

SUMMARY OF THE INVENTION

[009] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.

[010] The work piece to be edge prepared is placed on the driver wheel and driven wheel and the position is depending upon the length of the work piece, the stopper is fixed on the one end. The motor is switched on for the rotation of the work piece. The grinding wheel is locked to the desired angle by measuring in the angle measuring plate and locked with the help of the lock nut for loading as the desired angle. The grinding wheel is positioned nearer to the work piece by moving the cross way movement stud and locked with loading nut. Depending upon the diameter of the work piece the longitudinal control stud with handle is adjusted and when the grinding wheel motor switched on. Once the grinding wheel stands to rotate, necessary feed is given by the angular control stand with handle by moving inward until the desired edge preparation is carried out. During the operation the grinding wheel fixing nut is ensured the grinding wheel in horizontal position.

[011] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

[012] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.

[013] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[014] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein: -
Figure 1 shows: the isometric view of the two sub-assemblies of A and B of a device for edge preparation of thin wall pipes with different angle of chamfering according to present invention, wherein
Detail A in Figure 1 shows the details of the grinding wheel attachment with angular measuring device and clamping mechanisms of present invention.
Detail B in Figure 1 shows the work piece (pipe) holding device with stopper arrangement on one end and with driving mechanism of present invention.
[015] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAIL DESCRIPTION OF THE PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF PREFERRED EMBODIMENTS

[016] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[017] The present invention teaches regarding a technology pertaining to a device and method for edge preparation of thin wall pipes with different angle of chamfering. The device as illustrated in the accompanying figures involves the following parts: -

[018] Item No:1 cross way movement stud with handle.

[019] This is used to move the grinding wheel assembly perpendicular to the axis of the work piece and there is no locking required as it is self-locking stud.

[020] Item No: 2 Bottom guide channel

[021] Bottom guide channel for grinding tool assembly is used as base for the grinding wheel assembly and the ‘V’ guide (15) slides on the flanges of the channel.

[022] Item No: 3 Longitudinal control stud with handle.

[023] This moves parallel to the axis of the pipe (work piece) and it is used to move the grinding wheel to and fro, so that necessary feed can be given for edge preparation.

[024] Item No:4 Angle measuring plate.

[025] In this plate, the angular measurement is engraved ranging from 0 degree to 180degrre to tilt the grinding wheel to the desired angle of edge preparation.

[026] Item no:5 Lock nut for locating at desired angle.

[027] This is used only to hold the grinding tool either vertical or horizontal and locked at the respective position.

[028] Item No:6 Angular control stud with handle

[029] This is used to give parallel movement of the grinding to the self-desired angle.

[030] Item No:7 Vertical height adjustment nut

[031] This is used to move the grinding wheel upward and downward at the desired position to suit the various diameter of the work piece to be edge prepared.

[032] Item No:8 Grinding wheel fixing nut

[033] This is used to ensure the grinding wheel in horizontal position after locking with the nut (7).

[034] Item No:9 Grinding wheel

[035] This is the grinding tool used to remove the material from pipe to set the desired angle of edge preparation.

[036] Item No:10 Motor with roller to rotate the work piece

[037] This is used to rotate the work piece either in the clockwise or anticlockwise direction to the desired rotation need.

[038] Item No:11 Work piece

[039] It is the work piece which is to be edge prepared with desired angle.

[040] Item No:12 Driven rollers

[041] Driven roller supports the other end of the pipe and at the same time rotates the work piece activating as driven rollers.

[042] Item No:13 Stopper arrangement

[043] It is used to arrest the movement of the work piece at the backside while edge preparation is carried out at the front end.

[044] Item No:14 Bottom guide channel

[045] This is the base in which the work piece holding device is moved to and fro through ‘V’ guide fixed on the flanges of the channel

[046] Item No:15 ‘V’ Guide slide

[047] It is the ‘V’ guide roller sliding on the flanges of the bottom guide channel (2) for the to and fro motion of the grinding wheel assembly.

[048] Item No:16 ‘V’ guide slide

[049] It is the ‘V’ guide roller sliding on the flange of bottom guide channel (14) for the to and fro motion of the work piece holding assembly.

[050] Item No:17 Allen screw

[051] It is used to lock the movement perpendicular to the axis of the work piece.

[052] According to this invention, there is provided a device for edge preparation of thin wall pipes with different angle of chamfering comprising bottom guide channel (2) supporting grinding wheel assembly (9), which moves to and fro by ‘V’ guide roller (15) sliding on the flanges of the bottom guide channel (2), wherein the grinding wheel (9) is locked to the desired angle for loading; and

bottom guide channel (14) supporting work piece (11) holding assembly, which moves to and fro by ‘V’ guide roller (16) secured to the flanges of said bottom guide channel (14), in which both the bottom guide channels (2, 14) are placed adjacent to each other.

[053] The work piece (11) to be edge prepared is placed on driver wheel (10) at one end and driven wheel (12) at another end.

[054] The work piece (11) is secured to stopper (13) at one extreme end facing away from the grinding wheel (9).

[055] The grinding wheel (9) is positioned nearer to the work piece by moving the cross way movement stud (1) and locked with loading nut (17).

[056] The grinding wheel (9) is locked to the desired angle by measuring in the angle measuring plate (4) and locked with the help of the lock nut (5) for loading at the desired angle.

[057] Depending upon the diameter of the work piece (11), the longitudinal control stud with handle (3) is adjusted and when the grinding wheel motor is switched on.

[058] Once the grinding wheel (9) rotates, necessary feed is given by the angular control stand with handle (6) by moving inward until the desired edge preparation is carried out.

[059] It comprises grinding wheel fixing nut (8) that ensures the grinding wheel (9) in horizontal position during the operation.

[060] It comprises cross way movement stud with handle (1) so as to move the grinding wheel assembly perpendicular to the axis of the work piece, in which said stud is self locking stud, and comprises vertical height adjustment nut (7) in order to move the grinding wheel (9) upward and downward at the desired position to suit the various diameter of the work piece (11) to be edge prepared.

[061] A method for edge preparation of thin wall pipes with different angle of chamfering comprising steps of: -
- placement of work piece (11) to be edge prepared on driver wheel (10) and driven wheel (12),
- fixing of stopper (13) at one extreme end of the work piece (11) followed by rotation of the work piece (11) by motor (10),
- locking of grinding wheel (9) to the desired angle,
- positioning of the wheel (9) nearer to the work piece followed by locking of the wheel,
- adjustment of the longitudinal control stud with handle (3) according to the diameter of the workpiece (11),
- giving necessary feed by the angular control stand with handle (6) by moving inward until the desired edge preparation is carried out, once the grinding wheel rotates.

[062] Method of the edge preparation on machine is described hereinbelow:

[063] The work piece (11) to be edge prepared is placed on the driver wheel (10) and driven wheel (12) and the position depends upon the length of the work piece (11). The stopper (13) is fixed at one end. The motor (10) is switched on for the rotation of the work piece (11). The grinding wheel (9) is locked at the desired angle by measuring in the angle measuring plate (4) and locked with the help of the lock nut (5) for loading at the desired angle. The grinding wheel (9) is positioned nearer to the work piece by moving the cross way movement stud (1) and locked with loading nut (17). Depending upon the diameter of the work piece (11), the longitudinal control stud with handle (3) is adjusted and when the grinding wheel motor is switched on. Once the grinding wheel stands to rotate, necessary feed is given by the angular control stand with handle (6) by moving inward until the desired edge preparation is carried out. During the operation, the grinding wheel fixing nut (8) ensures the grinding wheel (9) in horizontal position.

[064] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.

[065] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

[066] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogues to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.

[067] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.

[068] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.

[069] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.

[070] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.