Spoke forming combined die capable of preventing excessive thinning of spoke corner

Abstract

The spoke forming combined die capable of preventing the corner of the spoke from being excessively thinned comprises a positive drawing die, a first pressing die and a second pressing die, the positive drawing die comprises a positive drawing upper die body, a first pressing die body, a second pressing die body, a positive drawing lower die body, a positive drawing male die body and an ejector plate, and the first pressing die body and the second pressing die body are fixedly arranged at the bottom end of the positive drawing upper die body. The first pressing die is located in the center of the bottom end of the positive drawing upper die, and the second pressing die is located on the periphery of the first pressing die. The positive drawing male die and the ejector plate are arranged at the top end of the positive drawing lower die, the surface of the positive drawing male die is conical, the positive drawing male die is located at the bottom end of the first pressing die, and the ejector plate is located at the bottom end of the second pressing die; and the positive pulling upper die moves downwards to pre-press and mold the cake plane steel plate into a pre-finished product, the pre-finished product is molded into a primary finished product through the first pressing die, and the primary finished product is molded into a semi-finished product through the second pressing die. The front drawing die has the advantages that the round cake plane steel plate is firstly preformed through the front drawing die, and the phenomenon that the corner of the surface of the spoke is seriously thinned is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wheel production, in particular to a spoke forming combined die for preventing excessive thinning at spoke corners. Background Art

[0002] At present, the main processes for producing steel wheel spokes include: blanking, primary forming, trimming, flanging, punching screw holes, extruding screw holes, punching center holes and punching air holes. The production of steel wheel spokes generally involves first shearing long sheets into circular flat steel plates through a shearing and blanking process, and then performing multiple stamping processes on the circular flat steel plates to form spokes.

[0003] The existing spoke forming combined mold includes a first pressing mold, a second pressing mold, a trimming and punching mold, a screw hole punching mold, a screw hole extrusion mold and a vent mold. Fig.13 and Fig.14 As shown, the circular flat steel plate is processed into a spoke pre-finished product by a first pressing die, and then the surface of the spoke finished product is trimmed to remove excess material by a trimming and punching die, and then the spoke pre-finished product is processed into a spoke semi-finished product by a second pressing die, and finally the spoke semi-finished product is processed into a spoke finished product by a screw hole punching die, a screw hole extrusion die and a vent hole die.

[0004] The existing spoke forming combined die is used to form a circular flat steel plate into a finished spoke. The corners of the spoke surface produced are severely thinned, and the qualified rate of the finished spoke is low, which needs to be improved. Utility Model Content

[0005] The utility model aims to provide a spoke forming combined die which can avoid serious thinning phenomenon at the corners of the formed spoke surface.

[0006] The utility model proposes a spoke forming combined die for preventing excessive thinning at the spoke corners, comprising a positive drawing die, a first pressing die and a second pressing die, the positive drawing die comprising a positive drawing upper die, a first pressing die, a second pressing die, a positive drawing lower die, a positive drawing punch and a top plate, the first pressing die and the second pressing die are fixedly arranged at the bottom end of the positive drawing upper die, the first pressing die is located at the bottom end center of the positive drawing upper die, the second pressing die is located at the periphery of the first pressing die and is arranged concentrically with the first pressing die; the positive drawing punch and the top plate are arranged at the top end of the positive drawing lower die, the surface of the positive drawing punch is arranged in a conical shape, the positive drawing punch is located at the bottom end of the first pressing die, and the top plate is located at the bottom end of the second pressing die; a circular flat steel plate is positioned and installed on the positive drawing punch, the positive drawing upper die descends so that the first pressing die and the second pressing die pre-press the circular flat steel plate into a pre-finished product, the first pressing die forms the pre-finished product into a primary finished product, and the second pressing die forms the primary finished product into a semi-finished product.

[0007] Preferably, a positioning column is provided at the center of the top end of the positive drawing punch, and the positioning column is passed through the center hole of the circular flat steel plate to achieve positioning.

[0008] Preferably, a punching block is slidably arranged in the first pressing die, a spring is arranged between the punching block and the positive drawing upper die, and two ends of the spring are respectively connected and fixed to the positive drawing upper die and the punching block.

[0009] Preferably, a receiving groove is formed at the top of the beating block, and one end of the spring is inserted into the receiving groove and fixed to the beating block.

[0010] Preferably, a first pad is fixedly arranged between the first pressure die and the positive pulling upper die, a second pad is fixedly arranged between the second pressure die and the positive pulling upper die, a limiting groove is formed between the first pressure die, the first pad and the positive pulling upper die, a limiting portion is arranged on the peripheral side of the top end of the punching block, and the limiting portion is embedded in the limiting groove.

[0011] Preferably, the first pressing die includes a first upper die, a first lower die, a first punch and a first die; the first punch is fixedly arranged at the top center position of the first lower die, and a plurality of molding grooves are formed on the top surface of the first punch; the first die is fixedly arranged at the bottom center position of the first upper die, and a plurality of molding protrusions are formed on the bottom surface of the first die.

[0012] Preferably, the second pressing die comprises a second upper die, a core die, a second concave die, a second lower die and a second convex die, the core die and the second concave die are fixedly arranged at the bottom end of the second upper die, the core die is located at the center of the bottom end of the second upper die, and the second concave die is sleeved on the periphery of the core die and is arranged concentrically with the core die;

[0013] The second punch is fixedly set at the top center of the second lower mold, the spoke preliminary product is positioned and installed on the second punch, the second upper mold moves downward to drive the core mold to abut against the spoke preliminary product, and the second die moves downward to bend the circumferential side of the spoke preliminary product to fit with the outer surface of the second punch.

[0014] Preferably, a discharge plate is provided between the core mold and the second die, a plurality of punching rods are fixedly provided on the top of the discharge plate, a plurality of punching holes are formed on the surface of the second upper mold, the punching rods are passed through the punching holes and maintain a lifting and sliding connection with the second upper mold.

[0015] Preferably, it also includes a trimming and punching die, a screw hole punching die, a screw hole extrusion die and a wind hole die. The trimming and punching die is used to eliminate the uneven distribution of material on the spoke surface, the screw hole punching die punches screw holes on the spoke surface, the screw hole extrusion die extrudes screw holes on the spoke surface, and the wind hole die processes wind holes on the spoke surface.

[0016] Preferably, the air hole mold includes a punching upper mold, a punching lower mold, a punch and a punching die, the punching die is fixedly arranged at the bottom center of the punching lower mold, and the punch is fixedly arranged at the bottom end of the punching upper mold by bolt locking.

[0017] From the above description of the utility model, it can be seen that the utility model has the following beneficial effects:

[0018] 1. Before the circular flat steel plate is processed into the spoke preliminary finished product by the first pressing die, the circular flat steel plate is first preformed by a positive drawing die, and the number of spoke forming steps is increased to avoid severe thinning at the corners of the spoke surface.

[0019] 2. Use a punch with a diameter greater than 65mm and fix it on the bottom of the punching upper die of the air hole die, so that the diameter of the air holes on the spoke surface formed by punching is larger, which reduces the rigidity of the spoke surface and moves the position on the spoke surface that is prone to cracking outward, thereby increasing the service life of the spoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a positive drawing die of an embodiment;

[0021] Figure 2 It is an embodiment Figure 1 A partial enlarged view in the middle;

[0022] Figure 3 is a cross-sectional view of a punching block of an embodiment;

[0023] Figure 4 is a cross-sectional view of a first compression mold of the embodiment;

[0024] Figure 5 It is an embodiment Figure 4 A partial enlarged view of point B in the middle;

[0025] Figure 6 is a cross-sectional view of the trimming and punching die of the embodiment;

[0026] Figure 7 is a cross-sectional view of the second pressing mold of the embodiment;

[0027] Figure 8 is a top view of the second compression mold of the embodiment;

[0028] Fig. 9 is a cross-sectional view of a screw hole punching die in an embodiment;

[0029] Fig.10 is a cross-sectional view of a screw hole extrusion die of an embodiment;

[0030] Fig.11 is a cross-sectional view of the air hole mold of the embodiment;

[0031] Fig.12 is a front view of a pre-finished product of the embodiment;

[0032] Fig.13 It is a front view of the finished product of the embodiment;

[0033] Fig.14 It is a cross-sectional view of a semi-finished product of the embodiment.

[0034] Figure numerals: 1, positive drawing die; 11, positive drawing upper die; 12, first pressing die; 13, second pressing die; 14, positive drawing lower die; 15, positive drawing punch; 151, positioning column; 16, ejector plate; 17, first pad; 171, limiting groove; 18, second pad; 19, punching block; 191, receiving groove; 192, spring; 193, limiting part; 2, first pressing die; 21, first upper die; 22, first lower die; 23, first punch ; 231, forming groove; 24, first concave die; 241, forming protrusion; 3, trimming and punching die; 4, second embossing die; 41, second upper die; 411, punching hole; 42, core die; 43, second concave die; 44, second lower die; 45, second convex die; 46, unloading plate; 47, punching rod; 5, screw hole punching die; 6, screw hole extrusion die; 7, air hole die; 71, punching upper die; 72, punching lower die; 73, punching concave die; 74, punch. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the following is a summary of the technical problems, technical solutions and beneficial effects to be solved by the present invention. Figure 1-14 It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Reference Figure 1-Figure 11 A spoke forming combined die for preventing excessive thinning at spoke corners comprises a positive drawing die 1, a first pressing die 2, a trimming and punching die 3, a second pressing die 4, a screw hole punching die 5, a screw hole extrusion die 6 and a vent hole die 7. A round flat steel plate is processed in sequence by the positive drawing die 1, the first pressing die 2, the trimming and punching die 3, the second pressing die 4, the screw hole punching die 5, the screw hole extrusion die 6 and the vent hole die 7.

[0037] Reference Figure 1 , Figure 2 and Figure 3, wherein the positive drawing die 1 includes a positive drawing upper die 11, a first die 12, a second die 13, a positive drawing lower die 14, a positive drawing punch 15 and a top plate 16, the first die 12 and the second die 13 are both arranged in a ring shape, the first die 12 is fixedly arranged at the bottom center of the positive drawing upper die 11, the second die 13 is arranged on the periphery of the first die 12 and fixed to the bottom end of the positive drawing upper die 11, and the second die 13 is kept concentric with the first die 12; a first pad 17 is fixedly arranged between the first die 12 and the positive drawing upper die 11, and the outer diameter size of the first pad 17 is equal to the outer diameter size of the first die 12; a second pad 18 is fixedly arranged between the second die 13 and the positive drawing upper die 11, and the outer diameter size of the second pad 18 is equal to the outer diameter size of the second die 13. The first pad 17 and the second pad 18 are arranged to protect the first upper die 21 and the second upper die 41 respectively. The positive drawing punch 15 and the ejector plate 16 are both arranged at the top of the positive drawing lower die 14. The positive drawing punch 15 is located at the top center of the positive drawing lower die 14, and the ejector plate 16 is sleeved on the periphery of the positive drawing punch 15. The positive drawing punch 15 is arranged in a cone shape, and a positioning column 151 is fixedly arranged at the center position of the top surface of the positive drawing punch 15. The circular flat steel plate is positioned on the positive drawing punch 15 so that the positioning column 151 is embedded in the center hole of the circular flat steel plate.

[0038] The first die 12 is set to be annular, and a punching block 19 is set in the first die 12. A receiving groove 191 is formed at the top of the punching block 19, and a spring 192 is set in the receiving groove 191. The two ends of the spring 192 are pulled together to fix the upper die 11 and the punching block 19. Under the action of the spring 192, the punching block 19 rises and falls and slides along the inner wall of the first die 12. The first pad 17 is also arranged to be annular, and the inner diameter of the first pad 17 is made larger than the inner diameter of the first die 12. After the first pad 17 is fixedly installed between the positive pull upper die 11 and the first die 12, a limiting groove 171 is formed between the first pad 17, the positive pull upper die 11 and the first die 12. Correspondingly, a limiting portion 193 is formed on the top peripheral side of the punching block 19, and the limiting portion 193 on the top peripheral side of the punching block 19 is embedded in the limiting groove 171, thereby limiting the punching block 19.

[0039] Reference Figure 4 , Figure 5 and Figure 6The first pressing die 2 includes a first upper die 21, a first lower die 22, a first convex die 23 and a first concave die 24, wherein the first convex die 23 is fixedly arranged at the top center of the first lower die 22, and the first concave die 24 is fixedly arranged at the bottom center of the first upper die 21; and a plurality of forming grooves 231 are formed on the top surface of the first convex die 23, and a plurality of forming convex dies corresponding to the forming grooves 231 are formed on the bottom surface of the first concave die 24, so that the top surface of the first convex die 23 and the bottom surface of the first concave die 24 complement each other. The spoke pre-finished product formed in the positive drawing die 1 is positioned and installed on the first convex die 23 of the first pressing die 2, and as the first concave die 24 and the first convex die 23 are molded together, the surface of the spoke pre-finished product is molded into a corresponding product shape, so that the spoke pre-finished product is processed to be molded into a spoke primary product. The spoke surface is molded twice by the positive drawing die 1 and the first pressing die 2, so as to reduce the thinning phenomenon at the corner of the molded spoke. Subsequently, the uneven material formed on the surface of the spoke pre-finished product is eliminated by the trimming and punching die 3.

[0040] Reference Figure 7 and Figure 8 The second pressing die 4 includes a second upper die 41, a core die 42, a second die 43, a second lower die 44, a second punch 45 and a stripper plate 46, wherein the second punch 45 is fixedly arranged at the top center of the second lower die 44, the core die 42 is fixedly arranged at the bottom center of the second upper die 41, the second die 43 is annular, the second die 43 is sleeved on the periphery of the core die 42 and fixed to the bottom end of the second upper die 41, so that the second die 43 and the core die 42 are concentrically arranged. In addition, the stripper plate 46 is lifted and slidably arranged between the second die 43 and the core die 42, and a plurality of punching rods 47 are vertically fixedly arranged at the top of the stripper plate 46, and a plurality of punching holes 411 are correspondingly opened and formed on the surface of the second upper die 41, and the plurality of punching rods 47 are respectively inserted into the punching holes 411 on the surface of the second upper die 41, so that the punching rods 47 and the second upper die 41 maintain a lifting and sliding connection. The spoke pre-finished product with the surface uneven material eliminated is inverted on the second punch 45, and the unloading plate 46 abuts against the surface of the spoke pre-finished product under the action of gravity. As the upper mold descends, the core mold 42 abuts against the center position of the surface of the spoke pre-finished product, and the second die 43 descends to bend the circumferential side of the surface of the spoke pre-finished product until it abuts against the outer surface of the second punch 45, thereby bending the spoke to form a semi-finished spoke.

[0041] Reference Fig. 9 , Fig.10 and Fig.11Finally, the processed spoke semi-finished product is processed through the punching hole die 5, the extruding hole die 6 and the air hole die 7 in sequence to form a spoke finished product. The air hole die 7 includes a punching upper die 71, a punching lower die 72, a punching die 73 and a punch 74. The punching die 73 is fixedly arranged at the center of the top surface of the punching lower die 72. The punch 74 is detachably fixed at the center of the bottom end of the punching upper die 71 by bolt locking, so that the punch 74 corresponds to the position of the punching die 73. The spoke semi-finished product is positioned and installed on the punching die 73. As the punching upper die 71 moves downward, the punch 74 punches the surface of the spoke semi-finished product, thereby completing the air hole punching on the spoke surface. A punch 74 with a diameter of 65 mm is selected and detachably fixedly installed on the bottom end of the punching upper die 71, so that the diameter of the air holes punched on the spoke surface is larger, the rigidity of the spoke surface is greater, and the increase in the air holes on the spoke surface causes the position of the cracks on the spoke surface to move outward, thereby increasing the service life of the spoke.

[0042] Reference Fig.12 , Fig.13 and Fig.14 The specific implementation principle of the embodiment of the present application is as follows: when the combined die is needed to form the circular flat steel plate into a spoke product, the circular flat steel plate is positioned and installed on the positive drawing punch 15 of the positive drawing die 1, so that the positioning column 151 on the surface of the positive drawing punch 15 is inserted into the center hole of the circular flat steel plate; then the positive drawing upper die 11 moves downward, so that the first pressing die 12 and the punching block 19 abut against the surface of the circular flat steel plate, and the second pressing die 13 bends the circumference of the circular flat steel plate, so that the circumference of the circular flat steel plate is bent to abut against the outer circumference of the positive drawing punch 15 and the surface of the ejector plate 16, so as to form the circular flat steel plate into a spoke pre-finished product. After the positive drawing upper die 11 moves upward, the punching block 19 demoulds the spoke pre-finished product under the action of the spring 192.

[0043] The spoke pre-finished product is positioned and installed on the first convex die 23. As the first concave die 24 and the first convex die 23 are molded together, the surface of the spoke pre-finished product forms a product shape, so that the spoke pre-finished product is formed into a spoke pre-finished product. Then the spoke pre-finished product is positioned and installed in the trimming and punching die 3, and the uneven material formed on the surface of the spoke pre-finished product is eliminated by the trimming and punching die 3. Then, the spoke pre-finished product processed by the trimming and punching die 3 is inverted on the second convex die 45 of the second pressing die 4. The stripper plate 46 abuts against the surface of the spoke pre-finished product under the action of gravity. As the second upper die 41 moves downward to drive the core die 42 to abut against the surface of the spoke pre-finished product, the second concave die 43 is driven to bend the circumference of the spoke pre-finished product to fit the outer surface of the second convex die 45, so that the spoke pre-finished product is bent and processed by the second pressing die 4 to form a spoke semi-finished product.

[0044] Finally, the spoke semi-finished product is processed through the punching hole die 5, the screw hole die 6 and the air hole die 7 in sequence to form a spoke finished product. When punching the spoke semi-finished product through the air hole die 7, a punch 74 with a diameter matching the air hole to be punched is selected, and the punch 74 is fixed to the punching upper die 71 by bolts. After the spoke semi-finished product is positioned and installed on the punching concave die 73, the punch 74 is driven downward by the punching upper die 71, so that the surface of the spoke semi-finished product is punched with air holes to form a spoke finished product. The diameter of the air hole punched on the spoke surface by the air hole die 7 is 65 mm. The larger diameter of the air hole punched on the spoke surface reduces the rigidity of the spoke surface, so that the position of the spoke surface that is prone to cracking moves outward, thereby increasing the service life of the spoke.

[0045] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all protected by the utility model.

Claims

1. A spoke forming assembly die for preventing excessive thinning at spoke corners, characterized in that: It comprises a positive drawing die, a first pressing die and a second pressing die, wherein the positive drawing die comprises a positive drawing upper die, a first pressing die, a second pressing die, a positive drawing lower die, a positive drawing convex die and a top plate, wherein the first pressing die and the second pressing die are fixedly arranged at the bottom end of the positive drawing upper die, the first pressing die is located at the center of the bottom end of the positive drawing upper die, and the second pressing die is located at the periphery of the first pressing die and is arranged concentrically with the first pressing die; The positive drawing punch and the ejector plate are arranged at the top end of the positive drawing lower die, the surface of the positive drawing punch is arranged to be conical, the positive drawing punch is located at the bottom end of the first die, and the ejector plate is located at the bottom end of the second die; The round flat steel plate is positioned and installed on the positive pulling punch, and the positive pulling upper die moves downward so that the first pressing die and the second pressing die pre-press the round flat steel plate into a pre-finished product. The first pressing die presses the pre-finished product into a preliminary finished product, and the second pressing die presses the preliminary finished product into a semi-finished product.

2. A spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 1, characterized in that: A positioning column is arranged at the center of the top end of the positive drawing punch, and the positioning column is penetrated into the center hole of the circular flat steel plate to achieve positioning.

3. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 1, characterized in that: A punching block is slidably arranged in the first pressing die, a spring is arranged between the punching block and the positive drawing upper die, and two ends of the spring are respectively connected and fixed to the positive drawing upper die and the punching block.

4. A spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 3, characterized in that: A receiving groove is formed at the top of the punching block, and one end of the spring is inserted into the receiving groove and fixed to the punching block.

5. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 3, characterized in that: A first pad is fixedly arranged between the first pressing die and the positive pulling upper die, a second pad is fixedly arranged between the second pressing die and the positive pulling upper die, a limiting groove is formed between the first pressing die, the first pad and the positive pulling upper die, a limiting portion is arranged on the peripheral side of the top end of the punching block, and the limiting portion is embedded in the limiting groove.

6. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 1, characterized in that: The first pressing die includes a first upper die, a first lower die, a first punch and a first die. The first punch is fixedly arranged at the top center position of the first lower die, and a plurality of molding grooves are formed on the top surface of the first punch; the first die is fixedly arranged at the bottom center position of the first upper die, and a plurality of molding protrusions are formed on the bottom surface of the first die.

7. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 1, characterized in that: The second pressing die comprises a second upper die, a core die, a second concave die, a second lower die and a second convex die, wherein the core die and the second concave die are fixedly arranged at the bottom end of the second upper die, the core die is located at the center of the bottom end of the second upper die, and the second concave die is sleeved on the periphery of the core die and is arranged concentrically with the core die; The second punch is fixedly set at the top center of the second lower mold, the spoke preliminary product is positioned and installed on the second punch, the second upper mold moves downward to drive the core mold to abut against the spoke preliminary product, and the second die moves downward to bend the circumferential side of the spoke preliminary product to fit with the outer surface of the second punch.

8. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 7, characterized in that: A discharge plate is arranged between the core die and the second die, a plurality of punching rods are fixedly arranged on the top of the discharge plate, a plurality of punching holes are formed on the surface of the second upper die, the punching rods are passed through the punching holes and maintain a lifting and sliding connection with the second upper die.

9. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 1, characterized in that: It also includes a trimming and punching die, a screw hole punching die, a screw hole extrusion die and a wind hole die. The trimming and punching die is used to eliminate the uneven distribution of material on the spoke surface, the screw hole punching die punches screw holes on the spoke surface, the screw hole extrusion die extrudes screw holes on the spoke surface, and the wind hole die processes wind holes on the spoke surface.

10. The spoke forming assembly die for preventing excessive thinning at spoke corners according to claim 9, characterized in that: The air hole die comprises a punching upper die, a punching lower die, a punch and a punching die. The punching die is fixedly arranged at the bottom center of the punching lower die, and the punch is fixedly arranged at the bottom end of the punching upper die by bolt locking.

Images