GB2242637A

GB2242637A - Adjusting device for a thread-rolling machine

Info

Publication number: GB2242637A
Application number: GB9007811A
Authority: GB
Inventors: Yun-Te Chang
Original assignee: FWU Kuang Enterprises Co Ltd
Current assignee: FWU Kuang Enterprises Co Ltd
Priority date: 1990-04-06
Filing date: 1990-04-06
Publication date: 1991-10-09
Also published as: GB9007811D0

Abstract

The adjusting device includes a first wedge 13 having a level top face and an inclined bottom face 12; a second wedge 23 having a level base portion 22 and a top inclined face 232 abutting the inclined bottom face 12 of the first wedge and a locking means 32, 33, 34 fixed to the machine and adjustably clamping the second wedge 23. The bottom end of a moving platen 4 of the machine abuts the level top face of the first wedge 13. The level base portion 22 of the second wedge 23 is slidably disposed on a movable carriage 5 of the machine. The first wedge 13 is raised or lowered when the second wedge 23 is moved on the carriage 5 to correspondingly change the height of the moving platen 4 relative to a stationary platen of the machine. <IMAGE>

Description

ADJUSTING DEVICE FOR A THREAD-ROLLING MACHINE This invention relates to a device for a threadrolling machine, more particularly to a device for adjusting the height of a moving grooved plate of a thread-rolling machine relative to a stationary grooved plate of the same.

A popular method of producing screw threads is by rolling under pressure. The part of a workpiece C to be threaded is rolled between a stationary grooved flat plate A and a moving grooved flat plate B that have the required form and pitch of the thread, as shown in Figures 1, 2. The moving plate B applies an effective torque on the workpiece C to rotate the same along the entire length of the stationary plate A to form the thread. The formation of the thread is done by plastic deformation and entails no removal of metal. The rolling operation involves a cold working process and thus improves the mechanical properties of the workpiece.

Figure 3 is . an illustration of a conventional tnread-rolling macnine. A movable carriage Bl has a recessed space for receiving the moving plate B. The moving plate B is clamped in the recessed space by a pressing means B2. A driving means B3 reciprocatingly moves the carriage B1. The moving plate B thus moves relative to the fixed plate A, which is Similarly clamped to a fixed support Al. During processing, the workpieces C are fed into the thread-rolling machine between the grooved plates A, B by a feeder D.

Figure 4 shows the proper positioning of the grooved plates A, B relative to each other. The peaks Al of the stationary plate A should be aligned with the valleys B1 of the moving plate B, and the valleys A2 of the stationary plate A should be aligned with the peaks B2 of the moving plate B. This is necessary in order to maintain the required form and pitch of the thread. The grooved plates A, B have a tendency to lose their alignment due to wear after a period of use. If the grooved plates A, B cannot be properly aligned, one or both of the grooved plates A, B are usually replaced with a new set. Some difficulty in aligning the peaks of one plate with the valleys of the other plate is usually encountered in the replacement of the grooved plates A, B.

Therefore, the object of this invention is to provide a means for adjusting the position of a moving grooved plate of a thread-rolling machine relative to a stationary grooved plate of the same, in order to align the valleys of the moving grooved plate with the peaks of the stationary grooved plate and vice-versa.

Accordingly, a height adjusting device for a threadrolling machine according to this invention comprises a first wedged support having a level top face and an inclining bottom face; a second wedged support having a wedge piece with a level base portion and a top inclining face that abuts with the inclining bottom face of the first wedged support; and a locking means fixed to the thread-rolling machine and adjustably clamping the second wedged support. The bottom end of a moving grooved plate of the thread-rolling machine abuts with the level top face of the first wedged support. The level base portion of the second wedged support is slidably disposed on a movable carriage of the thread-rolling machine.The first wedged support can be raised or lowered when the second wedged support is moved on the movable carriage to correspondingly change the position of the moving grooved plate relative to a stationary grooved plate of the threadrolling machine.

Other features and advantages of this invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, in which: Figure 1 is an illustration of a pair of grooved plates of a thread-rolling machine; Figure 2 illustrates the threading operation of the thread-rolling machine of Figure 1; Figure 3 is a perspective view of the thread-rolling machine of Figures 1, 2; Figure 4 shows the proper alignment of the grooved plates of Figure 1; Figure 5 is an exploded view of an adjusting device according to this invention; and Figures 6, 7 are schematic views of the preferred embodiment when used with the thread-rolling machine of Figure 3.

Referring to Figure 5, the preferred embodiment of an adjusting device according to this invention comprises a first wedged support 1, a second wedged support 2, and locking means 3.

The first wedged support 1 has a level top face 11 and an inclined bottom face 12. A first side face 13 is a rectangle which joins the top face 11 to the bottom face 12. A second side face 14 opposite the first side face 13 has an area substantially smaller than the first side face 13 and similarly joins the top face 11 to the bottom face 12.

The second wedged support 2 has a level base portion 21 with a limiting projection 22. The upper portion of the second wedged support 2 includes a wedge piece 23 and a mounting piece 24. The wedge piece 23 has a curving tapered end 231 and a top inclining face 232 in contact with the inclined bottom face 12 of the first wedged support 1. The mounting piece 24 is formed at one side of the wedge piece 23 opposite the curving end 231. The mounting piece 24 is a rectangle having a height and width bigger than that of the wedge piece 23. A threaded mounting hole 242 is formed at the portion 241 of the mounting piece 24 adjacent to the wedge piece 23.

The locking means 3 includes a threaded bolt 31, two clamping nut members 32, 33 and a locking nut member 34.

Figures 6, 7 illustrate how the preferred embodiment is assembled to a thread-rolling machine. A movable carriage 5 of the thread rolling machine has a first recessed portion for receiving a moving grooved plate 4. A second deep recessed portion 51 is formed in the movable carriage 5 below the moving grooved plate 4.

The movable carriage S further has a threaded cavity 52, with the axis thereof parallel to the surface 53 of the movable carriage 5, and an elongated slide groove 54 formed on the surface 53.

During assembly, the second wedged support 2 is slidably placed on the surface 53 of the movable carriage 5 in such a manner that the limiting projection 22 of the second wedged support 2 is slidably received by the elongated slide groove 54 of the movable carriage 5. The threaded bolt 31 passes through the mounting hole 242 of the second wedged support 2. An extreme end of the threaded bolt 31 is threaded into the threaded cavity 52. The clamping nut members 32, 33 are engaged with the threaded bolt 31 ana tightly abut with opposite sides of the mounting piece 24. The locking nut member 34 is similarly engaged with the threaded bolt 31 and abuts with a vertical face of the movable carriage 5. The second wedged support 2 is thus adjustably fixed relative to the movable carriage 5.

The inclined bottom face 12 of the first wedged support 1 abuts with the top inclining face 232 of the second wedged support 2. The moving grooved plate 4 has a flat base end in contact with the level top face 11 of the first wedged support 1. A pair of pressing means 61, 62 clamp the moving grooved plate 4 against the movable carriage 5.

Referring once more to Figure 5, the length of the inclined bottom face 12 is substantially shorter than that of the top inclining face 232 to allow movement of the first wedged support 1 along the top inclining face 232. The curving end 231 of the wedge piece 23 is received by the second recessed portion 51 of the movable carriage 5. The limiting projection 22 is of a size permitting movement of the limiting projection 22 along the elongated slide groove 54. The limiting protection 22 thus limits the movement of the second wedged support 2 on the movable carriage 5. The first side face 13 of the first wedged support 1 abuts with the movable carriage 5. The first wedged support 1 correspondingly moves up or down the top inclining face 232 in response to an inward or outward movement of the second wedged support 2. The position of the second wedged support 2 on the movable carriage 5 can be adjusted by loosening the clamping nut members 32, 33 and moving the second wedged support 2. The locking nut member 34 can be loosened for adjusting the threaded bolt 31. The height of the moving grooved plate 4 relative to a stationary grooved plate of the threadrolling machine can therefore be adjusted so that the peaks of one plate can be aligned with the valleys of the other plate, and vice-versa.

Claims

1. A height adjusting device for a thread-rolling machine including a stationary grooved plate, a movable carriage 5 having a recess, and a moving grooved plate 4 having a bottom end, said moving grooved plate 4 being detachably and replaceably received at said recess of-said movable carriage 5, said moving grooved plate 4 further having a first grooved face spaced from and facing a second grooved face of said stationary grooved plate, said movable carriage 5 carrying and reciprocatingly moving said moving grooved plate 4 relative to said stationary grooved plate, said adjustment device being mounted on said movable carriage 5 . below said moving grooved plate 4, and comprising:: a first wedged support 1 having a top face 11 and an inclining bottom face 12, said bottom end of said moving grooved plate 4 abutting with said top face 11 of said first wedged support 1; a second wedged support 2 having a wedge piece 23 with a level base portion 21 and a top inclining face 232 with a tapered end 231, said inclining bottom face 12 of said first wedged support 1 abutting with said top inclining face 232, said level base portion 21 abutting with said movable carriage 5, said wedge piece 23 being movable relative to said first wedged support 1; and a locking means 3 fixed to said movable carriage 5 and adjustably clamping said second wedged support 2; whereby, said first wedged support 1 is raised or lowered when said second wedged support 2 is moved to correspondingly change the position of said moving grooved plate 4 relative to said stationary grooved plate.

2. An adjusting device as claimed in Claim 1, wherein said top face 11 of said first wedged support 1 is a level surface.

3. An adjusting device as claimed in Claim 1, wherein said second wedged support 2 further comprises a mounting piece 24 connected to said wedge piece 23 opposite said tapered end 231 and having a height and width bigger than said wedge piece 23, said mounting piece 24 further having a mounting hole 242 adjacent to said wedge piece 23.

4. An adjusting device as claimed in Claim 3, wherein said locking means 3 comprises: a threaded bolt 31 adjustably fixed to said movable carriage 5, passing through said mounting hole 242 of said mounting piece 24, and extending longitudinally relative to said wedge piece 23; and a first and a second clamping nut member 32, 33 to be engaged with said threaded bolt 31 at opposite sides of said mounting piece 24.

5. An adjusting device as claimed in Claim 4, wherein said threaded bolt 31 has a portion threaded into said movable carriage 5, said locking means 3 further comprising a locking nut member 34 to lock said threaded bolt 31 against said movable carriage 5.

6. An adjusting device as claimed in Claim 1, wherein said level base portion 21 of said second wedged support 2 has a limiting projection 22 to limit the movement of said second wedged support 2 on said movable carriage 5.

7. An adjusting device as claimed in Claim 2, wherein said inclining bottom face 12 of said first wedged support 1 has a length substantially smaller than said top inclining face 232 of said second wedged support 2.

8. An adjusting device as substantially described hereinbefore with reference to the accompanying drawings.