CN114951480A - Technology for forming wheel rim by using plate - Google Patents

Abstract

The present application proposes a sheet metal forming process for wheel rims, which includes the following steps: S1, welding the sheet metal into a cylindrical shape; S2, molding a blank cylinder with a large end portion, a small end portion and a straight portion by using a first die; S3, Flanging the small end part to form a lock groove by using the inner rotating wheel and the outer rotating wheel; S4, using the spinning wheel to roll the straight cylinder part; S5, using the second die to press and finish the large end part. The dimensional accuracy of the formed rim can be improved.

Description

A sheet metal forming process for wheel rims

technical field

The present application relates to the field of wheel rim manufacturing, in particular to a sheet metal forming process for wheel rims.

Background technique

In the related art, after the sheet is rolled, the rim can be formed by hot pressing or cold pressing. The hot pressing process requires a large amount of equipment. Although the cold pressing process can reduce the equipment investment, the existing cold pressing process is in pressing the lock groove. When the thickness of the lock groove is thin, and the radial width of the small end part is difficult to meet the design requirements, resulting in a low dimensional accuracy of the final formed rim.

SUMMARY OF THE INVENTION

The present application aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, the purpose of this application is to propose a sheet metal forming process for wheel rims, which can improve the dimensional accuracy of the formed rims.

In order to achieve the above purpose, an embodiment of the present application proposes a sheet metal forming process for a wheel rim, which includes the following steps:

S1. Weld the plate into a cylindrical shape;

S2, using the first die to press to form a blank tube having a large end portion, a small end portion and a straight portion;

S3. Use the inner rotation wheel and the outer rotation wheel to flang the small end part to form a lock groove;

S4, use the spinning wheel to roll the straight cylinder part;

S5, using the second die to press and finish the big end portion.

According to the sheet metal forming wheel rim process proposed in the embodiment of the present application, the small end portion is rolled and flanged by the inner and outer rotation wheels to form the lock groove, which can ensure that the wall thickness of the lock groove and the width of the flange meet the requirements of Design requirements can improve machining accuracy and efficiency.

In addition, the sheet forming wheel rim process proposed by the present application may also have the following additional technical features:

Further, the step S1 also includes: S11, cutting the large flat plate into the specifications required before the wheel rim is formed; S12, rolling the cut flat plate through a rolling machine; S13, cutting the two ends of the cylindrical plate Flatten the flattened end; S14, use flash resistance welding to butt weld the flattened end.

Further, the outer diameter of the small end portion is smaller than the inner diameter of the straight cylindrical portion.

Further, the first mold includes a first outer mold sleeved on the outside of the first inner mold.

Further, the first outer mold has a first forming portion for molding the small end portion.

Further, in the step S3, the outer rotation wheel abuts against the groove of the outer wall of the small end portion, and the inner rotation wheel abuts against the inner wall of the small end portion.

Further, in the step S3, the outer rotation wheel and the inner rotation wheel are rotated under the driving of the blank cylinder.

Further, in the step S3, the outer diameter of the flange is equal to the outer diameter of the straight cylindrical portion.

Further, the second mold includes a second outer mold sleeved on the outside of the second inner mold.

Further, the second outer mold has a second forming portion for forming the curvature of the bending portion of the large end portion by molding.

Description of drawings

Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application rather than limit the scope of the present application. In the accompanying drawings:

1 is a flowchart of a sheet metal forming process for a wheel rim according to an embodiment of the present application;

2 is a schematic diagram of a sheet metal forming process for a wheel rim according to an embodiment of the present application;

3 is a schematic diagram of a first mold according to an embodiment of the present application;

4 is a schematic diagram of the arrangement of the flanging process for the small end portion according to an embodiment of the present application;

5 is a schematic diagram of a rolled big end portion according to an embodiment of the present application;

6 is a schematic diagram of a second mold according to an embodiment of the present application;

Reference number:

10. Blank tube;

11. Little endian part;

12. Straight cylinder part;

13. Big end part;

131. Bending part;

14. Lock slot;

15. Flanging part;

21. The first outer mold;

211. The first forming part;

22. The first inner mold;

221. The first inner forming part;

31. External rotation wheel;

32. Internal rotation wheel;

41. Spinning wheel;

51. The second inner mold;

52. The second outer mold;

521. A second forming part.

Detailed ways

The preferred embodiments of the present application will be described in detail below with reference to examples. However, those skilled in the art should understand that these exemplary embodiments are not meant to form any limitation to the present application. Furthermore, the features in the embodiments of the present application may be combined with each other without conflict. In different drawings, the same components are denoted by the same reference numerals, and other components are omitted for the sake of brevity, but this does not mean that other components cannot be included. It should be understood that the dimensions, proportions and numbers of components in the drawings are not intended to limit the present application.

As used herein, unless otherwise stated, "axial" means the direction of extension of the axis of rotation about which the blank 10 rotates, "radial" means the radial direction relative to the axis of rotation, and "circumferential" means relative to the axis of rotation The circumferential direction with respect to the axis of rotation, that is, the direction around the axis of rotation.

As shown in FIGS. 1 to 6 , the sheet metal forming process for a wheel rim according to an embodiment of the present application includes the following steps: S1. Welding the sheet a into a cylindrical shape; Part 11 and the blank cylinder 10 of the straight cylinder part 12; S3, use the inner rotation wheel 32 and the outer rotation wheel 31 to flang the small end part 11 to form the lock groove 14; S4, use the spinning wheel 41 to roll the straight cylinder part 12; S5, The large end portion 13 is press-molded with a second die.

In the related art, after the sheet is rolled, the rim can be formed by hot pressing or cold pressing. The hot pressing process requires a large amount of equipment. Although the cold pressing process can reduce the equipment investment, the existing cold pressing process is in pressing the lock groove. When the thickness of the lock groove is thin, and the radial width of the small end part is difficult to meet the design requirements, resulting in a low dimensional accuracy of the final formed rim.

For this reason, in a sheet metal forming wheel rim process of the present application, firstly, the cylindrical raw material d is molded by a first mold, so as to form a blank cylinder 10 having a small end portion 11, a large end portion 13 and a straight cylinder portion 12, which can ensure The wall thickness of the small end portion 11 is roughly equal to the thickness of the plate a; then the small end portion 11 is rolled and flanged by the inner rotation wheel 32 and the outer rotation wheel 31 to form the lock groove 14, which ensures that the lock groove 14 is formed after the lock groove 14 is formed. , the wall thickness at the lock groove 14 is roughly equal to the thickness of the plate a, and the width of the flange portion 15 can be more easily controlled, so that the wall thickness at the lock groove 14 and the radial width of the flange portion 15 can meet the design requirements Require.

According to an embodiment of the present application, step S1 further includes: S11, cutting the large flat plate into the specifications required before the wheel rim is formed, to form plate a; S12, rolling the plate a through a rounding machine to form a semi-finished product a b; S13, flatten the two ends of the semi-finished product 1 b to form the semi-finished product 2 c; S14, use flash resistance welding to butt-weld the ends of the semi-finished product 2 c to form the semi-finished product 3 d.

The semi-finished product 3 d is molded e by the first mold to form the blank tube 10; And the outer diameter of the small end portion 11 < the outer diameter of the straight cylindrical portion 12 < the outer diameter of the large end portion 13 .

It should be noted that the small end portion 11 is in the shape of a straight cylinder as a whole, and the large end portion 13 is in the shape of a trumpet as a whole. Arc transitions smoothly.

It should also be noted that the small end portion 11 of the blank tube 10 and the straight tube portion 12 have substantially the same wall thickness, and both are substantially the same as the thickness of the plate a.

In this embodiment, the first mold includes a first inner mold 22 and a first outer mold 21 , the first outer mold 21 and the first inner mold 22 are coaxially arranged, and the first outer mold 21 is sleeved outside the first inner mold 22 , the blank tube 10 is pressed between the first outer mold 21 and the first inner mold 22 .

It should be noted that a first forming part 211 is formed on the inner circumference of the first outer mold 21, and a first inner forming part 221 adapted to the first forming part 211 is formed on the outer circumference of the first inner mold 22. The cooperation of the first formed portion 211 and the first inner formed portion 221 can form the small end portion 11 .

After the blank tube 10 is formed, the first outer mold 21 is removed, and then the small end portion 11 is flanged by using the outer rotation wheel 31 and the inner rotation wheel 32 .

When flanging the small end portion 11, the inner rotation wheel 32 abuts against the inner wall of the small end portion 11, the outer rotation wheel 31 abuts against the groove of the outer wall of the small end portion 11, and the blank tube 10 is in the first The inner mold 22 is driven to rotate, and the inner rotation wheel 32 and the outer rotation wheel 31 are rotated under the driving of the blank cylinder 10 .

It should be noted that, when flanging the small end portion 11, the top height of the first inner mold 22 needs to be appropriately reduced, so that the small end portion 11 is higher than the top surface of the first inner mold 22, so that the inner rotation wheel 32 Provide enough room for action.

In this embodiment, the first inner mold 22 is formed by stacking a plurality of coaxially arranged modules. When flanging the small end portion 11, the first inner mold 22 can be lowered by removing the module above the first inner mold 22. 22 overall height.

It should be noted that, in order to facilitate the control of the radial width of the flanging portion 15, the axial length of the small end portion 11 can be controlled within an appropriate range during the process of forming the blank cylinder 10, that is, it can be ensured that the small end portion 11 can be flanged after being flanged. The radial width of the formed flange portion 15 can meet the design requirements.

It should also be noted that during the process of flanging the small end portion 11 with the inner rotation wheel 32 and the outer rotation wheel 31 to form the lock groove 14, the wall thickness of the small end portion 11 remains unchanged as a whole, so the final forming The wall thickness of the locking groove 14 and the wall thickness of the flanged portion 15 are substantially equal to the thickness of the plate a.

In addition, it should be noted that the outer diameter of the flanged portion 15 is substantially equal to the outer diameter of the straight cylindrical portion 12 .

It should be understood that, in the present application, the small end portion 11 with a certain axial length is formed by pre-pressing, and then the small end portion 11 is flanged by rolling, so that the wall of the lock groove 14 can be finally formed. The thickness and the width of the flanging portion 15 meet the design requirements at the same time, and the use of this forming process can improve the processing efficiency of the forming of the rim i, and at the same time ensure the dimensional accuracy of the rim i.

After the locking groove 14 is formed by flanging, the straight cylinder part 12 is rolled with the spinning wheel 41 to reduce the wall thickness of the straight cylinder part 12 and make it meet the design requirements.

Since the curvature of the bent portion 131 of the big end portion 13 cannot be finished by spinning, a second die is needed to finish the big end portion 13 h, and the spinning wheel 41 is driven by the blank cylinder 10 to rotate.

The second mold includes a second inner mold 51 and a second outer mold 52, the second inner mold 51 and the second outer mold 52 are kept coaxially arranged, and the blank tube 10 is clamped between the second inner mold 51 and the second outer mold 52. During this time, a second forming portion 521 is formed on the inner circumference of the second outer mold 52, and the bending portion 131 of the large end portion 13 can be pressed into an arc that meets the design requirements by using the second forming portion 521.

It should be noted that the second inner mold 51 and the first inner mold 22 in this embodiment are the same set of molds, but the height of the second inner mold 51 is smaller than the height of the first inner mold 22 . The mold 22 is formed by stacking a plurality of modules, so when finishing the large end portion 13 , it is only necessary to reduce the height of the first inner mold 22 again.

In this embodiment, the height of the first inner mold 22 when pressing the blank tube 10 > the height of the first inner mold 22 when flanging the small end portion 11 > the height of the second inner mold 51 when finishing the large end portion 13 .

It should be noted that, in this embodiment, the first outer mold 21 is mainly used to form the general outline of the blank cylinder 10 , and the second outer mold 52 is mainly used to press the bent portion 131 of the large end portion 13 . The mold can use the same set of molds, and the equipment designed by the forming process of the present application has the advantages of low cost and reduced manufacturing, and greatly reduces the equipment investment for rim forming.

According to the sheet metal forming wheel rim process proposed in the embodiment of the present application, the small end portion is rolled and flanged by the inner and outer rotation wheels to form the lock groove, which can ensure that the wall thickness of the lock groove and the width of the flange meet the requirements of Design requirements can improve machining accuracy and efficiency.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and alterations.

Claims (10)

1. a sheet metal forming wheel rim technology, is characterized in that, comprises the following steps: S1. Weld the plate into a cylindrical shape; S2, using the first die to press to form a blank tube having a large end portion, a small end portion and a straight portion; S3. Use the inner rotation wheel and the outer rotation wheel to flang the small end part to form a lock groove; S4, use the spinning wheel to roll the straight cylinder part; S5, using the second die to press and finish the big end portion. 2. The sheet metal forming wheel rim process according to claim 1, characterized in that, The step S1 further includes: S11, cutting the large flat plate into the specifications required before the wheel rim is formed; S12, rolling the cut flat plate through a rounding machine; S13, flattening the two ends of the cylindrical plate ; S14, use flash resistance welding to butt weld the flattened ends. 3. The sheet metal forming wheel rim process according to claim 2, characterized in that, The outer diameter of the small end portion is smaller than the inner diameter of the straight cylindrical portion. 4. The sheet metal forming wheel rim process according to claim 3, characterized in that, The first mold includes a first outer mold sleeved on the outside of the first inner mold. 5. The sheet metal forming wheel rim process according to claim 4, characterized in that, The first outer mold has a first forming portion for molding the small end portion. 6. The sheet metal forming wheel rim process according to claim 5, characterized in that, In the step S3, the outer rotation wheel abuts against the groove of the outer wall of the small end portion, and the inner rotation wheel abuts against the inner wall of the small end portion. 7. The sheet metal forming wheel rim process according to claim 6, characterized in that, In the step S3, the outer rotation wheel and the inner rotation wheel are rotated under the driving of the blank cylinder. 8. The sheet metal forming wheel rim process according to claim 7, characterized in that, In the step S3, the outer diameter of the flange is equal to the outer diameter of the straight cylindrical portion. 9. The sheet metal forming wheel rim process according to claim 8, characterized in that, The second mold includes a second outer mold sleeved on the outside of the second inner mold. 10. The sheet metal forming wheel rim process according to claim 9, characterized in that, The second outer mold is provided with a second forming portion for forming the camber of the large end portion by molding.

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