JP2000288669A - Manufacture of unequally thick rim and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and its device for manufacturing unequally thick rim wherein a work is varied only in the width direction but not in the peripheral length direction. SOLUTION: In a method for manufacturing an unequally thick rim wherein a partial thinning process is inserted between a trimming process and a roll forming process and the partial thinning process is substituted for rotational working. This device is composed of a rotatable mandrel 21 arranged in the inner peripheral side of a work 20 and rollers 22 (22R, 22L) arranged in the outer peripheral side of the work 20. The mandrel 21 is divided into left and right mandrels 21R, 21L. Further, the mandrel 21 is composed of a single mandrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing unequal thickness rims and an apparatus used directly for carrying out the method.

[0002]

2. Description of the Related Art In a two-piece wheel in which a rim and a disk are welded to each other, a method for manufacturing an unequal thickness rim is to round a flat plate and butt-weld the ends to form a cylindrical element ring. In this step, a part of the axial direction is ring-rolled with a rotating roller that cannot move in the axial direction to reduce the wall thickness, and then roll-formed into a rim shape (for example, JP-A-6-227).
662, JP-A-8-293631), and a method in which a part of the width direction is reduced by rolling or drawing in a flat plate stage, the flat plate is then rounded, and the ends are butt-welded to form a cylindrical elementary ring (for example, JP-A-8-2925
85, JP-A-9-302178).

[0003]

Problems to be Solved When the ring is rolled at the stage of the cylindrical element ring to make the thicknesses uneven, there are the following problems. When partial reduction is performed by ring rolling, the width and perimeter change due to the movement of the removed material, but the ratio between the width change and the perimeter change is not constant. According to an experiment, in the case of a one-point reduction, only the width increases when the reduction width is about 15 mm or less, but when it exceeds that, the circumference also increases. In the case of two-point rolling, both the width and the circumferential length change, and in the case where the left and right rolling widths are different, there is a difference between the left and right circumferential lengths, which tends to form a trumpet shape. For this reason, it is not easy to obtain a product having a desired size in one step, and there is a restriction on a thinned portion, and multiple steps are required for thinning. In the case of three or more locations, a problem basically similar to the case of two or more locations occurs. In the case where the thickness is made uneven by rolling or drawing at the stage of the plate, the following problem occurs. The unequal-thickness material is then processed into a rim shape through a process of winding → butt welding → trimming of welding burrs, with the following problems. 1) When the cross-sectional shape is asymmetric, the end faces are likely to be misaligned or twisted during winding. 2) Trimming of the welding beam inside and outside the ring is performed in the circumferential direction because of the shape of the ring, but it is difficult to completely match the bite shape with the thinned shape, so there is no leftover or too much leftover. It is easy to occur and the appearance quality is deteriorated. An object of the present invention is to provide a method for manufacturing an unequal-thickness rim in which the cylindrical element ring changes only in the width direction (axial direction) and does not change in the circumferential direction when the cylindrical element ring is made unequal in the stage of the cylindrical element ring. It is to provide the device. Another object of the present invention is to provide an apparatus for manufacturing an unequal thickness rim which can quickly attach and detach a cylindrical element ring to and from an unequal thickness apparatus when unequal thickness is obtained at the stage of a cylindrical element ring. Is to provide.

[0004]

The present invention to achieve the above object is as follows. (1) A cylindrical element in which a flat plate is wound, the ends are butt-welded to form a cylindrical element ring, the welded portion is trimmed, and a portion of the cylindrical element ring in the axial direction is reduced in thickness, and the thickness is reduced in part. A method for producing an unequal thickness rim having a step of forming a rim shape by roll forming a ring, wherein the partial thickness reduction processing is performed by rotating. (2) An apparatus for manufacturing an unequal thickness rim used in a step of partially reducing the thickness of a cylindrical element ring in manufacturing an unequal thickness rim, wherein the rotatable mandrel is inserted into the inner peripheral side of the cylindrical element ring. An apparatus for manufacturing an unequal-thickness rim, comprising: a rotatable roller positioned on the outer peripheral side of the cylindrical element ring and pressed against the cylindrical element ring and moved in the axial direction of the cylindrical element ring. (3) The mandrel is composed of a left mandrel and a right mandrel divided into two in the axial direction of the cylindrical element ring, and the rollers are provided corresponding to a left roller and a right mandrel provided corresponding to the left mandrel. The rim manufacturing apparatus according to (2), further comprising a right roller. (4) The apparatus for manufacturing an unequal thickness rim according to (2), wherein the mandrel comprises a single mandrel.

In the method for manufacturing an unequal-thick rim (1) and the apparatus for manufacturing an unequal-thick rim described in (2) and (4), since the partial thickness reduction is performed by rotating, the roller and the work ( The contact area of the cylindrical element ring is small in the width direction of the cylindrical element ring, and the material movement caused by the reduction occurs only in the width direction of the cylindrical element ring. In other words, the width of the work increases in accordance with the thickness reduction, and the diameter does not change. Therefore, dimensional control is easy, and an unequal thickness cylindrical element ring having a desired shape and dimensions can be easily obtained. In the apparatus for manufacturing an unequal-thickness rim of the above (3), since the mandrel is divided into the left and right mandrels, the attachment and detachment of the work (cylindrical element ring) to and from the mandrel separates the left and right mandrels by the length of the work. This can be done more quickly than with a single mandrel.

[0006]

FIG. 1 shows a method for manufacturing an unequal thickness rim according to an embodiment of the present invention. FIGS. 2 and 3 show a first embodiment of an apparatus for manufacturing an unequal thickness rim according to the present invention. 4 and 5 show a second embodiment of the apparatus for manufacturing an uneven rim according to the present invention. Portions common or similar to all embodiments of the present invention are denoted by the same reference numerals throughout all embodiments of the present invention.

First, a method for manufacturing an unequal thickness rim according to an embodiment of the present invention will be described with reference to FIG. The method for manufacturing the unequal thickness rim for a two-piece wheel according to the embodiment of the present invention includes a step 1 of drawing a material from a coil of the material, a step 2 of cutting the drawn flat material into a fixed size, and a step 3 of winding. A step 4 of butt welding the both ends of the wound material to form a cylindrical elementary ring, a step 5 of trimming the welding burrs, a step 6 of removing the axial burrs of the welded parts with a side cutter, Step 7 of reducing the thickness of a part of the ring in the width direction (axial direction)
And a step 8 of flaring (expanding) both ends of the cylindrical element ring which has been partially reduced in thickness, # 1 forming (shaping) roll, # 2 forming (shaping) roll, # 3 forming (shaping) roll Steps 9 and 1 for forming a rim by roll forming sequentially
0, 11; a shaping step 12 of making the rim shape a perfect circle by an expander or shrinker; and a step 13 of performing air leakage and appearance inspection. However, the order of Step 7 and Step 8 may be reversed, and the roundness may be corrected after the roundness is corrected by flaring.

The width direction (axial direction) of the cylindrical element ring inserted between the trimming step and the rim roll forming step
Part of the thinning process is a rotary handling process. As shown in FIG. 2, FIG. 3 or FIG. 4, FIG. 5, the rotatable mandrel 2 is rotatable on the inner peripheral side of the cylindrical element ring 20.
1 from the outer peripheral side of the cylindrical element ring 20,
Is pressed to move the roller 22 in the width direction (axial direction) of the cylindrical element ring 20, while reducing the thickness of the cylindrical element ring 20. Rotating handling is a type of spinning. This rotation handling is a partial thickness reduction that is partially performed in the width direction (axial direction) of the cylindrical element ring 20. Thinning is applied to the portion of the rim corresponding to the drop.

The width of the roller 22 (in the direction of the cylindrical element ring) is set so that the length of the contact portion with the cylindrical element ring 20 (in the direction of the cylindrical element ring) is 15 mm or less. ,
As a result, the peripheral length of the cylindrical element ring 20 does not change during the thickness reduction processing but changes only in the width direction.

With regard to the operation of the method for manufacturing an unequal-thickness rim of the present invention, the contact area between the roller 22 and the work (cylindrical elementary ring) 20 is reduced because the partial thickness reduction processing is performed by rotary processing. The movement of the material which is small in the width direction of the cylinder 20 and caused by the reduction occurs only in the width direction of the cylindrical element ring 20. In other words, the width of the work increases in accordance with the thickness reduction, and the diameter does not change. Therefore, dimensional control is easy, and an unequal thickness cylindrical element ring 20 having a desired shape and dimensions can be easily obtained.

Next, an apparatus for manufacturing an unequal thickness rim according to an embodiment of the present invention will be described. First, the common or similar parts of the apparatus for manufacturing an unequal thickness rim according to the first embodiment of the present invention and the apparatus for manufacturing an unequal thickness rim according to the second embodiment of the present invention will be described with reference to, for example, FIGS. Then, I will explain. The apparatus for manufacturing an unequal thickness rim according to the embodiment of the present invention includes a cylindrical element ring 20 for manufacturing an unequal thickness rim.
And a rotatable mandrel 21 inserted into the inner peripheral side of the cylindrical element ring 20 and an outer peripheral side of the cylindrical element ring 20. And a rotatable roller 22 pressed against the cylindrical element ring 20 and moved in the axial direction of the cylindrical element ring 20. The width of the roller 22 (in the axial direction of the cylindrical element ring) is
The length of the contact part with 0 (in the direction of the cylindrical element ring axis) is 15 mm
The circumferential length of the cylindrical element ring 20 does not change during the thickness-reducing process, but changes only in the width direction.

With respect to the operation of the apparatus for manufacturing an unequal-thickness rim of the present invention, the contact area between the roller 22 and the work (cylindrical elementary ring) 20 is reduced because the partial thickness reduction processing is performed by rotary processing. The movement of the material which is small in the width direction of the cylinder 20 and caused by the reduction occurs only in the width direction of the cylindrical element ring 20. In other words, the width of the work increases in accordance with the thickness reduction, and the diameter does not change. Therefore, dimensional control is easy, and an unequal thickness cylindrical element ring 20 having a desired shape and dimensions can be easily obtained.

Next, a part unique to each embodiment of the apparatus for manufacturing an unequal thickness rim according to the present invention will be described. First, the first of the present invention
In the apparatus for manufacturing an unequal thickness rim according to the embodiment, as shown in FIGS. 2 and 3, the mandrel 21 is divided into two in the axial direction of the cylindrical element ring 20 and the left mandrel 21 </ b> L and the right mandrel 2.
1R, the roller 22 and the right mandrel 21 provided with the roller 22 corresponding to the left mandrel 21L.
And a right roller 22R provided corresponding to R.
The left roller 22L handles and processes the cylindrical element ring 20 while moving to the left from the divided portion of the mandrel 21, and the right roller 22R handles and processes the cylindrical element ring 20 while moving to the right from the divided portion of the mandrel 21. The left roller 22L and the right mandrel 21R are located on opposite sides of the mandrel, and balance the pressing force of the left roller 22L and the pressing force of the right mandrel 21R with each other to facilitate the support of the mandrel. is there.

The left mandrel 21L is fixed to an axially movable and rotatable left plate 23L and rotates integrally with the left plate 23L. The right mandrel 21R is axially movable and rotatable right. It is fixed to the plate 23R and rotates integrally with the right plate 23R. The left mandrel 21L and the right mandrel 21R are spigot-fitted to each other so as to be relatively movable in the mandrel axial direction. When the cylindrical element ring 20 is processed and extended in the axial direction, the distance between the left mandrel 21L and the right mandrel 21R increases, and the distance between the left plate 23L and the right plate 23R increases.
A left stripper 24L is provided between the left end of the cylindrical element ring 20 and the left mandrel 21L, and a right stripper 24R is provided between the right end of the cylindrical element ring 20 and the right mandrel 21R. Stripper 24L, 2
The 4R positions and fixes the cylindrical element ring (work) 20 at a predetermined position in the axial direction, and ejects the work when removing the work.

In the operation of the apparatus for manufacturing an unequal-thickness rim according to the first embodiment of the present invention, handling is performed as follows. While pressing the roller against the work, the left roller 22L is moved to the left from the mandrel dividing position, and the right roller 2L is moved.
2R is moved to the right from the mandrel split position. Since the width of the work 20 increases as the handling process progresses, the distance between the two side plates 23L and 23R is increased accordingly. As the method, there is a method in which a force is constantly applied in a direction in which the mandrel closes (a direction in which the mandrel closes relatively) and the work does not hinder the spread of the work, and the work is spread naturally by the spread of the work, and a hydraulic servo mechanism. There is a method of opening the position by controlling the position, for example, and either method may be used.

The work can be removed by the roller 22.
L and 22R are retracted, then left and right strippers 24
The left and right mandrels 21L and 21R are opened while pressing the L and 24R in the direction of the work. To mount the work, the rollers 22L and 22R are retracted and the left and right mandrels 21 are moved.
With the L and 21R open, the work is placed between the left and right mandrels 21L and 21R, the rollers 22L and 22R are advanced, and the left and right mandrels 21L and 21R are closed. In attaching and detaching the work, the work is attached to each of the left and right mandrels 21L and 21R.
Since it is only necessary to make the relative movement by the length of 21R, it is sufficient to make the relative movement by half of the case of a single mandrel (a mandrel having twice the length of the split mandrel), and the work can be attached to and detached from the mandrel. Can be done promptly.

In the apparatus for manufacturing an unequal thickness rim according to the second embodiment of the present invention, as shown in FIGS. 4 and 5, the mandrel 21 comprises a single mandrel, and the rollers 22 are provided corresponding to the mandrel. I have. A balance roller may be provided for the roller 22. In this case, it is desirable that the roller 22 and the balance roller be provided at positions opposite to each other with the mandrel interposed therebetween to facilitate the support of the mandrel. The mandrel 21 is fixed to a rotatable plate 23 and rotates integrally with the plate 23. A stripper 24 is provided between the plate 24 and the work end.

In the operation of the apparatus for manufacturing an unequal-thickness rim according to the second embodiment of the present invention, handling is performed as follows. The roller 22 is moved in the axial direction while being pressed against the work 20 to perform a working process. As the processing proceeds, the width of the work 20 increases, but one end of the work is not pressed in the axial direction so that the work 20 can freely escape. In order to prevent the work from slipping, one end of the work may be constantly pressed with a force that does not prevent the work from expanding in width.

To remove the work, the roller 22 is retracted, the stripper 24 is pressed in the direction of the work, and the work 20 is slid with respect to the mandrel 21 to remove it from the mandrel 21. The work is mounted by sliding the work with respect to the mandrel 21 while facing the end of the mandrel 21 with the roller 22 retracted.

[0020]

According to the method for manufacturing an unequal thickness rim according to the first aspect and the manufacturing apparatus for an unequal thickness rim according to the second and fourth aspects, since the partial thickness reduction is performed by rotary processing, the roller and the work ( The contact area of the cylindrical element ring is small in the width direction of the cylindrical element ring, and the material movement caused by the reduction occurs only in the width direction of the cylindrical element ring. In other words, the width of the work increases in accordance with the thickness reduction, and the diameter does not change. Therefore, dimensional control is easy, and an unequal thickness cylindrical element ring having a desired shape and dimensions can be easily obtained. According to the rim manufacturing apparatus of the third aspect, since the mandrel is divided into the left and right mandrels, the attachment and detachment of the work (cylindrical element ring) to and from the mandrel separates the left and right mandrels by the length of the work. And can be performed more quickly than with a single mandrel.

[Brief description of the drawings]

FIG. 1 is a process chart of a method for manufacturing an unequal thickness rim according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the apparatus for manufacturing an unequal-thickness rim according to the first embodiment of the present invention at the time of completion of handling.

FIG. 3 is a cross-sectional view of the apparatus for manufacturing an unequal thickness rim according to the first embodiment of the present invention when a workpiece is removed.

FIG. 4 is a cross-sectional view of a device for manufacturing an unequal-thickness rim according to a second embodiment of the present invention at the time of completion of handling.

FIG. 5 is a cross-sectional view of a device for manufacturing an unequal thickness rim according to a second embodiment of the present invention when a workpiece is removed.

[Explanation of symbols]

 Reference Signs List 20 cylindrical element ring 21 mandrel 21L left mandrel 21R right mandrel 22 roller 22L left roller 22R right roller 23 plate 24 stripper

Continued on the front page (72) Inventor Mitsunori Sugawara 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries, Ltd. (72) Inventor Shin Suzuki 5-9, Yonbancho, Chiyoda-ku, Tokyo Inside Topy Industries, Ltd. (72) Inventor Atsushi Sakuma 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries Co., Ltd. (72) Inventor Fumio Yayanagi 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries Ltd.

Claims (4)

[Claims] 1. A cylindrical plate which is formed by winding a flat plate, butt-welding the ends to form a cylindrical elementary ring, trimming the welded part, reducing the thickness of a part of the cylindrical elementary ring in the axial direction, and partially reducing the thickness. A method for producing an unequal thickness rim having a step of forming a rim shape by roll forming a shape element ring, wherein the partial thickness reduction processing is performed by rotation processing. 2. An apparatus for manufacturing an unequal thickness rim, which is used in a step of partially reducing the thickness of a cylindrical element ring in the production of an unequal thickness rim, wherein the rotatable member is inserted into the inner peripheral side of the cylindrical element ring. An apparatus for manufacturing an unequal-thickness rim, comprising: a mandrel; and a rotatable roller positioned on the outer peripheral side of the cylindrical element ring and pressed against the cylindrical element ring and moved in the axial direction of the cylindrical element ring. 3. The mandrel comprises a left mandrel and a right mandrel divided into two in the axial direction of the cylindrical elementary ring, and the rollers correspond to a left roller and a right mandrel provided corresponding to the left mandrel. 3. The apparatus for manufacturing an unequal thickness rim according to claim 2, comprising a right roller provided. 4. The apparatus according to claim 2, wherein said mandrel comprises a single mandrel.