Rim shrinking die

Abstract

The utility model provides a rim shrinkage die, including upper die portion, lower die portion and shrinkage portion, the upper die portion includes shrinkage die basin body and shrinkage basin body backing plate, the shrinkage basin body backing plate is in the cone-shaped cylinder structure that has conical inner wall and is connected integrally, and the shrinkage basin body backing plate is in the cone-shaped cylinder structure that has conical inner wall. The shrinkage mold basin body is sleeved on the periphery of the shrinkage basin body base plate and is in interference fit with the shrinkage basin body base plate; the contraction part comprises a sliding plate, an elastic seat and a plurality of contraction sliding block sets, and the contraction sliding block sets are distributed in the circumferential direction, attached to the conical inner wall of the contraction basin body base plate and matched with the sliding plate in a radial sliding mode through guide keys; and the elastic seat applies outward elastic reset force to the guide key in the radial direction. The produced product is stable in quality, and the comprehensive use cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel molds, in particular to a rim shrinkage mold. Background Art

[0002] The wheel rim, commonly known as the wheel rim, is the part around the wheel that mounts and supports the tire. Together with the spokes, it forms the wheel. After the wheel rim is formed, it needs to be shaped in a shrinking die to eliminate dimensional tolerances.

[0003] The basic structure of an existing rim shrinking mold consists of a shrinking mold basin connected to the lower end of an upper mold plate. A set of shrinking basin pads are evenly spaced along the inner side of the shrinking mold basin. A guide key is embedded between every two adjacent shrinking basin pads, and each guide key is equipped with a shrinking slider that slidably engages with it. These shrinking basin pads are designed to be divided into multiple small pieces after processing and then assembled into the shrinking mold basin. This structure has the disadvantage that the shrinking basin pads can deform and loosen after being divided into small pieces, significantly reducing the mold's service life, failing to meet mold precision requirements, and resulting in high maintenance costs. Furthermore, the quality of the produced rims is unstable. Utility Model Content

[0004] Therefore, in order to solve the above problems, the utility model provides a rim shrinking die.

[0005] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0006] A rim shrinkage mold comprises an upper mold part, a lower mold part and a shrinkage part, the upper mold part and the lower mold part are arranged correspondingly in the upper and lower directions, the upper mold part has an upper mold inner cavity, and the shrinkage part is arranged in the upper mold inner cavity; the upper mold part comprises a shrinkage mold basin and a shrinkage basin pad, the shrinkage basin pad is an integrally connected conical cylindrical structure with a conical inner wall, and the conical inner cavity of the shrinkage basin pad is a part of the upper mold inner cavity; the shrinkage mold basin is sleeved on the outer periphery of the shrinkage basin pad and forms an interference fit; the shrinkage part comprises a sliding plate, an elastic seat and a plurality of shrinkage slider groups, the plurality of shrinkage slider groups are circumferentially distributed and fit on the conical inner wall of the shrinkage basin pad, and can be radially slidably fitted on the sliding plate through a guide key; the elastic seat applies a radially outward elastic reset force to the guide key.

[0007] Furthermore, the outer circumferential surface of the shrinkage basin pad is formed with multiple step surfaces from top to bottom, or the outer circumferential surface of the shrinkage basin pad is a smooth conical surface, the inner wall of the shrinkage mold basin body is adapted to the outer circumferential surface of the shrinkage basin pad, and the inner wall of the shrinkage mold basin body is also provided with abutting bottom surface; when the shrinkage mold basin body is sleeved on the outer circumference of the shrinkage basin pad, the positioning is achieved by abutting the bottom surface against the upper end surface of the shrinkage basin pad.

[0008] Furthermore, the upper mold part also includes a transition ring and an upper template, the transition ring is fixed to the upper end of the shrinkage mold basin body, and the upper template is fixed to the upper end of the transition ring; the inner cavity of the transition ring is connected to the inner cavity of the shrinkage mold basin body and the shrinkage basin body pad and together constitute the inner cavity of the upper mold; the shrinkage part also includes a hanging plate, which is fixedly connected to the sliding plate and is located in the inner cavity of the transition ring, and the upper end of the hanging plate is provided with a radially outward-protruding limiting protrusion. When the shrinkage part is reset downward into position, the limiting protrusion of the hanging plate abuts against the upper end surface of the shrinkage mold basin body to achieve limiting.

[0009] Furthermore, an elastic buffer block is provided at the upper end of the hanging plate. When the shrinking part is pushed upward by the lower mold part, a buffering contact is formed with the upper mold plate through the elastic buffer block.

[0010] Furthermore, the elastic seat includes a seat body and a plurality of springs assembled on the outer circumference of the seat body. The seat body is fixed on the sliding plate. The plurality of springs correspond to the guide keys one by one and apply radially outward reset elastic force to the guide keys.

[0011] Furthermore, the plurality of shrinking slider groups are evenly distributed in the circumferential direction, and an elastic member is provided between two adjacent shrinking slider groups.

[0012] Furthermore, the elastic member is arranged at a position below two adjacent contraction slider groups.

[0013] Furthermore, the retracting slider group includes a sliding block and a retracting block, the inclination of the outer side surface of the sliding block is the same as the inclination of the conical inner wall of the retracting basin body pad and can be slidably fitted to the conical inner wall of the retracting basin body pad; the sliding block can be radially slidably fitted on the sliding plate through a guide key; the retracting block is detachably fixed to the inner side surface of the sliding block.

[0014] Furthermore, a positioning step is provided on the inner side surface of the sliding block, and a positioning boss is provided on the shrinking block. The shrinking block is positioned and assembled by abutting the positioning boss against the positioning step of the sliding block.

[0015] Furthermore, the shrinking block and the sliding block are detachably fixed by screwing with bolts.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] When the rim shrinking mold of the present application is used, the rim is placed between multiple shrinking slider groups, and the lower mold part pushes upward against the multiple shrinking slider groups, so that the shrinking part moves upward as a whole, and the integrally connected shrinking basin pad only plays a role in converting the direction of the multiple shrinking slider groups. That is, when the shrinking slider groups move upward, the multiple shrinking slider groups are synchronously retracted by the cooperation of the conical inner wall of the shrinking basin pad, and the radial guidance of the multiple shrinking slider groups is achieved by the guide key that can be radially slidably engaged on the sliding plate. This avoids the deformation and looseness caused by dividing the shrinking basin pad into multiple small pieces and then assembling them on the shrinking mold basin, as well as the subsequent high maintenance costs and unstable rim quality problems. This ensures that the quality of products produced by the rim shrinking mold of the present application is stable and the overall cost of use is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure shows a cross-sectional view of the structure of the rim shrinkage mold in the embodiment in the mold opening state;

[0019] Figure 2 The figure shows a cross-sectional view of the structure of the rim shrinkage mold in the embodiment in the mold closing state;

[0020] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the shrinkable basin body pad in the embodiment. DETAILED DESCRIPTION

[0021] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0022] In the description of the present invention, terms such as "up", "down", "left", "right", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0023] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0024] Reference Figures 1 to 3As shown, the present embodiment provides a rim shrinkage mold, comprising an upper mold part 10, a lower mold part 20 and a shrinkage part 30. The upper mold part 10 and the lower mold part 20 are arranged correspondingly in the upper and lower parts. The upper mold part 10 has an upper mold inner cavity, and the shrinkage part 30 is arranged in the upper mold inner cavity. Specifically, the lower mold part 20 can adopt the existing technology, which will not be described in detail here.

[0025] Specifically, the upper mold part 10 includes a shrink mold basin 11 and a shrink basin pad 12, as shown in FIG. Figure 3 As shown, the shrinkage basin pad 12 is a conical cylindrical structure with a conical inner wall 121 that is connected as a whole. The conical inner cavity of the shrinkage basin pad 12 is part of the inner cavity of the upper mold. The shrinkage mold basin 11 is sleeved on the outer periphery of the shrinkage basin pad 12 and forms an interference fit; that is, the interference fit setting of the shrinkage mold basin 11 and the shrinkage basin pad 12 permanently integrates the two, so that the mold will not deform or loosen; further, the interference fit value between the shrinkage basin pad and the shrinkage mold basin is preferably 3-4mm. At the same time, the shrinkage basin pad 12 can be refined again to achieve a certain degree of precision and have a more stable performance state.

[0026] Specifically, for the convenience of explanation, the circumferential and radial directions in the following description are described with reference to the shrinkage basin pad 12, that is, the radial direction is the direction perpendicular to the central axis of the shrinkage basin pad 12, and the circumferential direction is the direction around the central axis of the shrinkage basin pad 12.

[0027] The contraction portion 30 includes a sliding plate 32, an elastic seat 33, and a plurality of contraction slider groups 31. The plurality of contraction slider groups 31 are circumferentially distributed and affixed to the conical inner wall 121 of the contraction basin backing plate 12. Specifically, the outer surfaces of the plurality of contraction slider groups 31 have the same slope as the conical inner wall 121 of the contraction basin backing plate 12. This affixing is surface-to-surface contact; in other directions, the conical inner wall 121 of the contraction basin backing plate 12 does not restrict the contraction slider groups 31. The plurality of contraction slider groups 31 are radially slidably engaged with the sliding plate 32 via guide keys 34 (e.g., I-shaped keys). The elastic seat 33 applies a radially outward elastic restoring force to the guide keys 34. In other words, the plurality of contraction slider groups 31 are connected to the sliding plate 32 and affixed to the conical inner wall 121 of the contraction basin backing plate 12 under the radially outward elastic force applied by the elastic seat 33.

[0028] During use, the rim 1 is placed between multiple shrinking slider groups 31, and the lower mold part 20 pushes upward against the multiple shrinking slider groups 31, causing the shrinking part 30 to move upward as a whole. The integrally connected shrinking basin pad 12 only plays a role in converting the direction of the multiple shrinking slider groups 31, that is, when the shrinking slider groups 31 move upward, they shrink inward synchronously through the cooperation of the conical inner wall 121 of the shrinking basin pad 12, thereby shrinking and shaping the rim 1. This arrangement avoids the deformation and looseness caused by dividing the shrinking basin pad 12 into multiple small pieces and then assembling them on the shrinking mold basin 11 in the prior art, as well as the subsequent high maintenance costs and unstable rim quality. This ensures that the quality of the products produced by the rim shrinking mold of this application is stable, and the overall cost of use is greatly reduced.

[0029] Specifically, when the contraction portion 30 is moved downward as a whole to reset, the multiple contraction slider groups 31 move radially outward under the drive of the elastic seat 33, thereby ensuring that they fit on the conical inner wall 121 of the contraction basin pad 12 and are reset to their original position.

[0030] Furthermore, in this embodiment, the outer circumference of the shrinkage basin backing plate 12 is formed with a plurality of stepped surfaces 122 from top to bottom. The inner wall of the shrinkage mold basin 11 is adapted to the outer circumference of the shrinkage basin backing plate 12. This increases the contact area between the shrinkage mold basin 11 and the shrinkage basin backing plate 12, and the interference fit is more secure. Of course, in other embodiments, the contact surface between the shrinkage basin backing plate 12 and the shrinkage mold basin 11 is not limited to this. For example, the outer circumference of the shrinkage basin backing plate 12 is a smooth conical surface, and the inner wall of the shrinkage mold basin 11 is also a conical inner wall adapted to the outer circumference of the shrinkage basin backing plate 12.

[0031] At the same time, the inner wall of the shrinkage mold basin body 11 is also provided with an abutting bottom surface 111; when the shrinkage mold basin body 11 is sleeved on the outer periphery of the shrinkage basin body pad 12, the abutting bottom surface 111 is abutted against the upper end surface of the shrinkage basin body pad 12 to achieve positioning, thereby achieving precise assembly of the shrinkage basin body pad 12 and the shrinkage mold basin body 11.

[0032] The upper mold part 10 also includes a transition ring 13 and an upper mold plate 14, the transition ring 13 is fixed on the upper end of the shrink mold basin body 11, and the upper mold plate 14 is fixed on the upper end of the transition ring 13; the inner cavity of the transition ring 13 is connected to the inner cavity of the shrink mold basin body 11 and the shrink basin body pad 12 and together constitute the inner cavity of the upper mold; the shrink part 30 also includes a hanging plate 35, the hanging plate 35 is fixedly connected to the sliding plate 32 and is located in the inner cavity of the transition ring 13, and the upper end of the hanging plate 35 is provided with a radially outwardly protruding limit protrusion 351, when the shrink part 30 is reset to its position downward, the limit protrusion 351 of the hanging plate 35 abuts against the upper end surface of the shrink mold basin body 11 to achieve limitation; that is, the setting of the transition ring 13 is used to limit the lifting and lowering movement range of the shrink part 30. Specifically, an elastic buffer block 36 is provided at the upper end of the hanging plate 35. When the contracting portion 30 is pushed upward by the lower mold portion, the elastic buffer block 36 forms a buffering contact with the upper mold plate 14. That is, when the contracting portion 30 moves upward and the multiple contracting slider groups 31 are retracted to their full positions, the elastic buffer block 36 abuts against the upper mold plate 14, achieving a buffering contact and protecting the various components from damage caused by rigid impact. More specifically, the elastic buffer block 36 can be a rubber block with elastic buffering properties, or a spring or other elastically deformable device.

[0033] Furthermore, the elastic seat 33 includes a seat body and multiple springs mounted on the outer periphery of the seat body. The seat body is fixed to the sliding plate 32. The multiple springs correspond to the guide keys 34 one by one and apply a radially outward return elastic force to the guide keys 34. This structure is simple and easy to implement. Of course, in other embodiments, the structure of the elastic seat 33 is not limited to this.

[0034] Specifically, multiple retractable slider groups 31 are evenly distributed in the circumferential direction. Since only the upper portion of the retractable slider group 31 is limited by the guide key 34, and other positions (such as the middle and lower portions) are not limited, the retractable slider group 31 is prone to deflection, swinging, and becoming stuck during actual operation. To this end, in this embodiment, an elastic member is provided between two adjacent retractable slider groups 31. This allows both sides of each retractable slider group 31 to be supported and limited by the elastic member, allowing the multiple retractable slider groups 31 to retract and expand synchronously, thus preventing deflection and swinging. Further preferably, the elastic member is provided below two adjacent retractable slider groups 31 to achieve a better limiting effect. More specifically, the elastic member is a spring.

[0035] The retracting slider group 31 includes a sliding block 311 and a retracting block 312. The inclination of the outer side surface of the sliding block 311 is the same as the inclination of the inner wall surface of the retracting basin pad 12 (i.e., the conical inner wall 121) and can be slidably fitted on the conical inner wall 121 of the retracting basin pad; the sliding block 311 can be radially slidably fitted on the sliding plate 32 through the guide key 34; the retracting block 312 is detachably fixed to the inner side surface of the sliding block 311; in this way, the retracting blocks can be replaced separately according to different models of rims 1, avoiding the overall disassembly and assembly of the retracting slider group 31; the replacement efficiency is faster, and the debugging after the overall replacement of the retracting slider group 31 is also eliminated.

[0036] The inner side of the sliding block 311 is provided with a positioning step, and the retracting block 312 is provided with a positioning boss. The retracting block 312 is positioned and assembled by the positioning boss abutting against the positioning step of the sliding block 311, ensuring installation accuracy. Furthermore, the retracting block 312 and the sliding block 311 are detachably fixed via bolts, making assembly and disassembly simple.

[0037] Of course, in other embodiments, the structure of the retractable slider assembly 31 is not limited thereto. For example, the retractable slider assembly 31 may also be an integrally connected structure.

[0038] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A rim shrinking mold, comprising an upper mold portion, a lower mold portion, and a shrinking portion, wherein the upper mold portion and the lower mold portion are arranged in a corresponding upper and lower manner, the upper mold portion has an upper mold cavity, and the shrinking portion is arranged in the upper mold cavity; characterized in that: The upper mold part includes a shrinkage mold basin body and a shrinkage basin pad. The shrinkage basin pad is an integrally connected conical cylindrical structure with a conical inner wall. The conical inner cavity of the shrinkage basin pad is a part of the upper mold inner cavity; the shrinkage mold basin body is sleeved on the outer periphery of the shrinkage basin pad and forms an interference fit; the shrinkage part includes a sliding plate, an elastic seat and a plurality of shrinkage slider groups, the plurality of shrinkage slider groups are circumferentially distributed and fit on the conical inner wall of the shrinkage basin pad, and can be radially slidably fitted on the sliding plate through a guide key; the elastic seat applies a radially outward elastic reset force to the guide key.

2. The rim shrinking mold according to claim 1, characterized in that: The outer circumferential surface of the shrinkage basin pad is formed with multiple step surfaces from top to bottom, or the outer circumferential surface of the shrinkage basin pad is a smooth conical surface, the inner wall of the shrinkage mold basin is adapted to the outer circumferential surface of the shrinkage basin pad, and the inner wall of the shrinkage mold basin is also provided with a contact bottom surface; when the shrinkage mold basin is sleeved on the outer circumference of the shrinkage basin pad, the contact bottom surface is pressed against the upper end surface of the shrinkage basin pad to achieve positioning.

3. The rim shrinking mold according to claim 1, characterized in that: The upper mold part also includes a transition ring and an upper template, the transition ring is fixed on the upper end of the shrink mold basin body, and the upper template is fixed on the upper end of the transition ring; the inner cavity of the transition ring is connected to the inner cavity of the shrink mold basin body and the shrink basin body pad and together constitute the inner cavity of the upper mold; the shrink part also includes a hanging plate, the hanging plate is fixedly connected to the sliding plate and is located in the inner cavity of the transition ring, the upper end of the hanging plate is provided with a radially outward-protruding limiting protrusion, and when the shrink part is reset downward into position, the limiting protrusion of the hanging plate abuts against the upper end surface of the shrink mold basin body to achieve limiting.

4. The rim shrinking mold according to claim 3, characterized in that: An elastic buffer block is provided at the upper end of the hanging plate. When the shrinking part is pushed up by the lower mold part, a buffering contact is formed with the upper mold plate through the elastic buffer block.

5. The rim shrinking mold according to claim 1, characterized in that: The elastic seat includes a seat body and a plurality of springs assembled on the outer circumference of the seat body. The seat body is fixed on the sliding plate. The plurality of springs correspond to the guide keys one by one and apply radial outward reset elastic force to the guide keys.

6. The rim shrinking mold according to claim 1, characterized in that: The plurality of shrinking slider groups are evenly distributed in the circumferential direction, and an elastic member is provided between two adjacent shrinking slider groups.

7. The rim shrinking mold according to claim 6, characterized in that: The elastic member is arranged at a position below two adjacent contraction slider groups.

8. The rim shrinking mold according to claim 1, characterized in that: The retracting slider group includes a sliding block and a retracting block. The inclination of the outer side surface of the sliding block is the same as the inclination of the conical inner wall of the retracting basin body pad and can be slidably fitted to the conical inner wall of the retracting basin body pad; the sliding block can be radially slidably fitted on the sliding plate through a guide key; the retracting block is detachably fixed to the inner side surface of the sliding block.

9. The rim shrinking mold according to claim 8, characterized in that: The inner side surface of the sliding block is provided with a positioning step, and the shrinking block is provided with a positioning boss. The shrinking block is positioned and assembled by the positioning boss abutting against the positioning step of the sliding block.

10. The rim shrinking mold according to claim 8, characterized in that: The shrinking block and the sliding block are detachably fixed by screwing with bolts.

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