Spoke special-shaped pressing die

Abstract

The utility model discloses a spoke special-shaped pressing die. The spoke special-shaped pressing die comprises an upper die, a lower die, an ejector rod and a nitrogen spring. The upper die comprises an upper die plate, an upper padding plate, a first die core, a pressing and wrapping male die, a second die core, a female die padding plate and a female pressing die, the nitrogen spring is arranged at the bottom end of the upper die plate, the upper padding plate is fixed to the nitrogen spring, and the first die core, the pressing and wrapping male die and the second die core are fixed to the bottom end of the upper padding plate; the female die base plate is arranged at the bottom end of the upper die plate, the peripheral side of the upper base plate extends to be provided with a limiting part, a limiting groove is formed between the female die base plate and the upper die plate, the limiting part is clamped and embedded in the limiting groove, and the concave pressing die is fixed to the bottom end of the female die base plate. The lower die comprises a lower die plate, a male die base, a first male die and a second male die, the male die base is arranged on the lower die plate, and the first male die and the second male die are both arranged on the male die base. The mold has the advantages that the mold can perform preforming, contour extrusion and convex hull appearance extrusion on the spoke, so that the spoke can be formed in one step, and the process cost and the mold cost are greatly saved.

Description

Technical Field

[0001] This utility model relates to the field of wheel spoke processing and forming technology, and in particular to a wheel spoke irregular shape pressing mold. Background Technology

[0002] Wheel spoke forming typically requires 2 to 5 forming processes, necessitating multiple molds for simultaneous processing. Referring to patent CN114309331A, existing wheel spoke forming molds first draw and punch the sheet metal to obtain an arched wheel spoke blank, with a pre-drilled hole in the center. The blank is then extruded and calibrated to obtain a semi-finished wheel spoke with a contoured surface and pre-set perpendicularity on its straight edges. The semi-finished wheel spoke is then stamped to form air holes and screw hole pilot holes. Finally, the stamped semi-finished wheel spoke is finished, and the screw hole pilot holes are extruded to the required dimensions to form the screw holes, resulting in the finished wheel spoke. The nitrogen spring in existing wheel spoke forming molds only functions for pressing and unloading the material, without any pre-forming function.

[0003] As can be seen from the above summary, the existing wheel spoke forming mold only performs pre-forming of the sheet metal by drawing, and the edge contour is not squeezed. Therefore, forming wheel spokes using the existing wheel spoke forming mold requires a process of squeezing the convex bulge, which involves many processes and high mold costs, and improvements are needed. Utility Model Content

[0004] The purpose of this invention is to propose a wheel spoke profile forming die that can complete wheel spoke preforming, extrusion contour and extrusion convex shape, so that wheel spokes can be formed in one step, greatly saving process and die costs.

[0005] This utility model proposes a spoke-shaped forming mold, comprising an upper mold, a lower mold, several ejector pins, and several nitrogen springs. The ejector pins are fixedly mounted on the top of the upper mold. The upper mold includes an upper template, an upper backing plate, a first mold core, a pressing punch, a second mold core, a die backing plate, and a concave mold. The nitrogen springs are disposed at the bottom of the upper template. The upper backing plate is located below the upper template and fixed to each nitrogen spring. The first mold core, the pressing punch, and the second mold core are fixed to the bottom of the upper backing plate. The concave mold... A backing plate is fixed to the bottom end of the upper template and surrounds the outer periphery of the upper backing plate. A limiting part is provided on the periphery of the upper backing plate. A limiting groove is formed between the die backing plate and the upper template. The limiting part is embedded in the limiting groove. The concave mold is fixed to the bottom end of the die backing plate. The lower mold includes a lower template, a punch seat, a first punch, and a second punch. The punch seat is fixedly disposed on the lower template. The first punch and the second punch are both fixedly disposed on the punch seat. The second punch surrounds the outer periphery of the first punch.

[0006] Preferably, a top plate is arranged around the periphery of the punch seat, and a plurality of first top springs are arranged between the top plate and the lower template, with the two ends of the first top springs being fixed to the top plate and the lower template respectively.

[0007] Preferably, a plurality of limiting blocks are vertically fixed on the lower template, and the plurality of limiting blocks are arranged around the periphery of the top plate and abut against the top plate.

[0008] Preferably, a number of positioning pins are fixedly provided on the bottom of the lower template and the upper template, and positioning grooves are formed in both the punch seat and the die pad.

[0009] Preferably, a second ejector spring is provided inside the first mold core and the upper pad, and a ejector bar is fixedly provided at the bottom end of the second ejector spring, the ejector bar passing through the bottom end of the first mold core.

[0010] Preferably, a third ejector spring is provided in the punch holder and the first punch, and a circular positioning pin is fixedly provided on the third ejector spring, the circular positioning pin passing through the surface of the first punch.

[0011] Preferably, the second punch is annular, and a limiting platform is formed on the inner peripheral side of the surface of the second punch, with the outer peripheral side of the bottom surface of the first punch resting on the limiting platform.

[0012] Preferably, the bottom surface of the lower template has a plurality of positioning holes for mold positioning.

[0013] Preferably, a guide sleeve is fixedly provided on the lower template, a guide post is fixedly provided at the bottom end of the upper template, a guide post pressure plate is provided around the guide post, and the guide post passes through the guide sleeve.

[0014] As can be seen from the above description of this utility model, this utility model has the following beneficial effects:

[0015] 1. The nitrogen spring in the mold enables the pre-forming of the spokes. The mold completely seals the edge contour of the spokes, enabling the pre-forming, extrusion of the contour and the extrusion of the convex shape of the spokes, so that the spokes can be formed in one step, which greatly saves process and mold costs.

[0016] 2. A second ejector spring is provided in the first mold core and the upper backing plate, and a ejector bar is fixedly provided at the bottom end of the second ejector spring. The ejector bar passes through the bottom end of the first mold core to eject the formed wheel spokes and prevent the wheel spokes from getting stuck in the concave mold.

[0017] 3. An ejector plate is arranged around the periphery of the punch seat. Several first ejector springs are arranged between the ejector plate and the lower die plate. Under the action of the ejector springs, the ejector plate separates the formed wheel spokes from the lower die, so as to facilitate the removal of the formed wheel spokes from the die. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a spoke-shaped forming die according to an embodiment;

[0019] Figure 2 This is a top view of an embodiment of a spoke-shaped die lifting mechanism;

[0020] Figure 3 This is an example. Figure 2 Sectional view at point AA;

[0021] Figure 4 This is an example. Figure 2 Sectional view at point BB;

[0022] Figure 5 This is a schematic diagram of the structure of the pad in the embodiment;

[0023] Figure 6 This is a partial cross-sectional view of the upper backing plate, the limiting part, and the die backing plate in the embodiment;

[0024] Figure 7 This is a partial structural schematic diagram of the second punch and the limiting stage in the embodiment;

[0025] Figure 8 This is a schematic diagram of the structure of the first punch and the disc positioning pin in the embodiment;

[0026] Figure 9 This is a cross-sectional view of the ejector bar and the second ejector spring in the embodiment.

[0027] Reference numerals: 1. Upper mold; 11. Upper template; 111. Locating pin; 112. Guide post; 113. Guide post pressure plate; 12. Upper pad; 121. Limiting part; 13. First mold core; 14. Pressing punch; 15. Second mold core; 16. Die pad; 161. Locating groove; 162. Limiting groove; 17. Concave pressing die; 18. Second ejector spring; 19. Ejector bar; 2. Lower mold; 21. Lower template; 211. Locating hole; 212. Guide sleeve; 22. Punch seat; 23. First punch; 24. Second punch; 241. Limiting platform; 25. Third ejector spring; 26. Circular locating pin; 27. Ejector plate; 28. First ejector spring; 29. ​​Limiting block; 3. Ejector rod; 4. Nitrogen spring. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer and more understandable, the following description is provided in conjunction with the appendix. Figure 1-9 The present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0029] Reference Figures 1-4 A spoke-shaped forming die includes an upper die 1, a lower die 2, several ejector pins 3, and several nitrogen springs 4. The ejector pins 3 are fixedly mounted on the upper die 1. The upper die 1 includes an upper template 11, an upper pad 12, a first mold core 13, a pressing punch 14, a second mold core 15, a concave mold pad 16, and a concave pressing die 17. The upper pad 12 is located at the bottom center of the upper template 11. Several nitrogen springs 4 are placed between the upper template 11 and the upper pad 12, and the two ends of the nitrogen springs 4 are fixed to the upper template 11 and the upper pad 12, respectively. The first mold core 13 is fixedly set at the bottom end of the upper pad 12. The pressing punch 14, the second mold core 15, the die pad 16 and the concave pressing die 17 are all annular. The pressing punch 14 is sleeved around the first mold core 13, and the pressing punch 14 is fixed to the bottom end of the upper pad 12 with bolts. The second mold core 15 is sleeved around the pressing punch 14, and the second mold core 15 is fixed to the bottom end of the upper pad 12 with bolts.

[0030] Reference Figure 4 , Figure 5 and Figure 6 The die pad 16 is fitted around the upper pad 12, and the die pad 16 is fixed to the upper template 11 with bolts. To ensure that the die pad 16 is accurately positioned at the bottom of the upper template 11, several positioning pins 111 are fixedly provided at the bottom of the upper template 11. Correspondingly, a positioning groove 161 is formed in the die pad 16, and the positioning pins 111 at the bottom of the upper template 11 pass into the positioning groove 161 of the die pad 16. To prevent the upper pad 12 from descending excessively under the influence of gravity, a limiting part 121 is provided on the outer periphery of the upper pad 12. Correspondingly, a limiting groove 162 is formed on the inner periphery of the die pad 16, and the limiting part 121 on the outer periphery of the upper pad 12 is engaged in the limiting groove 162 of the die pad 16, allowing the limiting part 121 to rise and fall within the limiting groove 162. The concave mold 17 is fixed to the bottom end of the concave mold pad 16, and the inner sidewall of the concave mold 17 abuts against the outer sidewall of the second mold core 15.

[0031] Reference Figure 4 and Figure 7The lower die 2 includes a lower template 21, a punch seat 22, a first punch 23, and a second punch 24. The punch seat 22 is fixed at the center of the lower template 21. To ensure precise positioning and installation of the punch seat 22 on the lower template 21, several positioning pins 111 are provided on the surface of the lower template 21. Correspondingly, several positioning grooves 161 are formed at the bottom end of the punch seat 22. When the punch seat 22 is installed on the lower template 21, the positioning pins 111 on the lower template 21 pass into the positioning grooves 161 at the bottom end of the punch seat 22. The first punch 23 is fixed at the center of the punch seat 22. The second punch 24 is annular and is fixed on the punch seat 22, with its inner sidewall abutting against the outer surface of the upper end of the punch seat 22. To facilitate the installation and disassembly of the lower die 2, a limiting platform 241 is formed on the inner circumference of the surface of the second punch 24. After the second punch 24 is installed on the punch seat 22, the surface of the limiting platform 241 is flush with the top surface of the punch seat 22. After the first punch 23 is fixedly installed on the punch seat 22, the outer circumference of the bottom surface of the first punch 23 rests on the limiting platform 241. After the first punch 23 is fixedly installed on the punch seat 22 with bolts, the second punch 24 can also be fixedly installed on the punch seat 22 by bolts.

[0032] The ejector rod 3 is engaged with the ejector cylinder of the equipment. The ejector cylinder drives the upper mold 1 to rise and fall, and then drives the upper mold 1 to fall, so that the upper mold 1 and the lower mold 2 can close together. In order to facilitate precise alignment of the mold with the top equipment, several positioning holes 211 are formed at the top of the lower template 21, and several positioning holes 211 are formed at the bottom of the lower template 21 for mold placement and positioning. Correspondingly, positioning pins are set on the processing table at the bottom of the equipment. After the mold is placed on the processing table, the positioning pins on the processing table pass into the positioning holes 211 at the bottom of the lower template 21, so that the mold is directly below the equipment. In order to achieve precise mold closing between the upper mold 1 and the lower mold 2, a guide sleeve 212 is fixedly set on the lower template 21, and a guide post 112 is fixedly set at the bottom of the upper template 11, with the guide post 112 passing through the guide sleeve 212. To ensure precise positioning and installation of the guide pillar 112 at the bottom of the upper mold plate 11, a guide pillar pressure plate 113 is fixedly installed at the bottom of the upper mold plate 11, and the guide pillar pressure plate 113 is sleeved around the guide pillar 112. In addition, the guide pillar pressure plate 113 can also withstand part of the impact force during the mold closing process of the upper mold 1 and the lower mold 2, so as to avoid damage to the mold during the mold closing process.

[0033] Reference Figure 8 and Figure 9When a disc needs to be shaped into spokes, a third ejector spring 25 is provided in the punch seat 22 and the first punch 23 to ensure precise positioning of the disc on the lower die 2. A disc positioning pin 26 is fixedly installed on the third ejector spring 25. The disc positioning pin 26 protrudes from the surface of the first punch 23 under the action of the third ejector spring 25. Correspondingly, a circular hole corresponding to the disc positioning pin 26 is formed in the disc. After the disc is installed on the first punch 23, the disc positioning pin 26 is inserted into the circular hole of the disc under the action of the spring, thus completing the precise positioning of the disc on the first punch 23. During the downward movement of the upper die 1, the upper pad 12, under the action of each nitrogen spring 4, allows the first die core 13, the pressing punch 14, and the second die core 15 to pre-shape the disc. As the upper die 1 continues to descend, the concave die 17 bends the periphery of the disc, while the first die core 13, the pressing punch 14, and the second die core 15 completely press the disc into shape to form the spokes.

[0034] To facilitate unloading of the press-formed wheel spokes, a second ejector spring 18 is formed within the first mold core 13 and the upper backing plate 12, and a ejector bar 19 is fixedly installed at the bottom end of the second ejector spring 18. As the upper mold 1 moves upward, the ejector bar 19 protrudes from the bottom surface of the first mold core 13 under the action of the second ejector spring 18, thereby separating the formed disc from the upper mold 1 and preventing the formed wheel spokes from getting stuck in the concave mold 17. In addition, an ejector plate 27 is provided around the punch base 22. The ejector plate 27 is annular and fits around the punch base 22, abutting against the outer side wall of the punch base 22. At the same time, a plurality of first ejector springs 28 are provided between the ejector plate 27 and the lower mold plate 21, with both ends of the plurality of first ejector springs 28 fixed to the ejector plate 27 and the lower mold plate 21, respectively. After the upper mold 1 and the lower mold 2 are closed together, the ejector plate 27 presses the first ejector spring 28. After the ejector cylinder of the equipment drives the upper mold 1 to rise, the ejector plate 27 lifts the formed wheel spoke under the action of the first ejector spring 28, thereby making the formed wheel spoke separate from the lower mold 2 so as to remove the formed wheel spoke from the mold.

[0035] In order to prevent the top plate 27 from shifting position during the rising process, which would prevent the spokes from being ejected smoothly, a number of limiting blocks 29 are fixedly installed on the lower template 21. The limiting blocks 29 are evenly distributed along the periphery of the top plate 27, so that the outer wall of the top plate 27 abuts against each limiting block 29. Thus, under the action of the first top spring 28, the top plate 27 rises along each limiting block 29.

[0036] The specific implementation principle of this application embodiment is as follows: When the spokes need to be processed into spokes using the spoke profile forming mold, the spoke profile forming mold is placed on the processing table, so that the positioning pin on the processing table passes into the positioning hole 211 at the bottom of the lower mold plate 21, thereby making the mold precisely correspond to the top equipment. The disc to be processed is placed on the first punch 23, and the disc is moved so that the disc positioning pin 26 passes into the disc's circular hole under the action of the third ejector spring 25, thereby making the disc precisely positioned on the lower mold 2.

[0037] The ejector rod 3, in conjunction with the ejector cylinder of the equipment, drives the upper mold 1 downwards, thereby causing the upper mold 1 and the lower mold 2 to close together. Under the action of the nitrogen springs 4, the upper backing plate 12 pre-forms the disc by the first mold core 13, the pressing plate, and the second mold core 15. At the same time, the ejector rod 19 contacts the disc and compresses the second ejector spring 18 to hide inside the first mold core 13. As the upper mold 1 continues to descend, the concave die 17 bends the outer periphery of the disc to fit against the outer wall of the second mold core 15. Simultaneously, the concave die 17 drives the ejector plate 27 to compress the first ejector spring 28 during its descent. After the upper mold 1 and the lower mold 2 are fully closed, the disc is precisely pressed into the spokes, and a protrusion is extruded on the surface of the spokes.

[0038] Subsequently, the ejector cylinder drives the upper mold 1 upward, while simultaneously, the ejector bar 19, under the action of the second ejector spring 18, separates the formed spokes from the upper mold 1 to prevent the formed spokes from getting stuck in the concave mold 17. The ejector plate 27 descends under the action of the first ejector spring 28, lifting the formed spokes so that the formed spokes are separated from the lower mold 2, thus facilitating the removal of the spokes from the mold. Several nitrogen springs 4 installed in this spoke profile forming mold have a pre-compression forming effect on the spokes. In this mold, pre-forming is achieved through nitrogen springs 4, and then the ejector cylinder drives the upper mold 1 downward to extrude the disc into a convex shape and contour. Pre-forming, convex extrusion, and contour forming are completed in one process, greatly saving process and mold costs, and the positional accuracy of the formed spokes is high.

[0039] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, shall be protected by the present invention.

Claims

1. A spoke-shaped forming die, characterized in that: It includes an upper mold, a lower mold, several ejector pins, and several nitrogen springs, with the ejector pins fixedly disposed at the top of the upper mold; The upper mold includes an upper template, an upper pad, a first mold core, a pressing punch, a second mold core, a concave mold pad, and a concave pressing mold. A plurality of nitrogen springs are disposed at the bottom end of the upper template. The upper pad is located below the upper template and is fixed to each nitrogen spring. The first mold core, the pressing punch, and the second mold core are fixed at the bottom end of the upper pad. The concave mold pad is fixed to the bottom end of the upper template and surrounds the outer periphery of the upper mold pad. A limiting part is provided on the circumferential side of the upper mold pad. A limiting groove is formed between the concave mold pad and the upper template. The limiting part is embedded in the limiting groove. The concave mold is fixed to the bottom end of the concave mold pad. The lower die includes a lower template, a punch seat, a first punch, and a second punch. The punch seat is fixedly mounted on the lower template, and both the first punch and the second punch are fixedly mounted on the punch seat. The second punch surrounds the periphery of the first punch.

2. The spoke profiled die according to claim 1, wherein: A top plate is arranged around the periphery of the punch seat, and a plurality of first top springs are arranged between the top plate and the lower template. The two ends of the first top springs are fixed to the top plate and the lower template, respectively.

3. The spoke profiled die of claim 2, wherein: Several limiting blocks are vertically fixed on the lower template, and the limiting blocks are arranged around the periphery of the top plate and abut against the top plate.

4. The spoke profiled die of claim 1 wherein: Several positioning pins are fixedly provided at the bottom of both the lower and upper templates, and positioning grooves are formed in both the punch seat and the die pad.

5. The spoke profiled die of claim 1 wherein: A second ejector spring is provided inside the first mold core and the upper backing plate. A ejector bar is fixedly provided at the bottom end of the second ejector spring, and the ejector bar passes through the bottom end of the first mold core.

6. The spoke profiled die of claim 1 wherein: A third ejector spring is provided in the punch holder and the first punch, and a circular positioning pin is fixedly provided on the third ejector spring. The circular positioning pin passes through the surface of the first punch.

7. The spoke profiled die of claim 1 wherein: The second punch is annular, and a limiting platform is formed on the inner circumferential side of the surface of the second punch. The outer circumferential side of the bottom surface of the first punch sits against the limiting platform.

8. The spoke profiled die of claim 1 wherein: The bottom surface of the lower template has several positioning holes for mold positioning.

9. The spoke profiled die of claim 1 wherein: A guide sleeve is fixedly installed on the lower template, and a guide post is fixedly installed at the bottom of the upper template. A guide post pressure plate is installed around the guide post, and the guide post passes through the guide sleeve.

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