A spoke stamping combined die

Abstract

The present technology relates to the field of cold working tooling, and provides a spoke stamping processing combined die, which can complete the four sub-processes of outer circle blanking, stretching, center hole blanking, and flanging in the spoke stamping process at one time; a spoke stamping processing combined die, including a lower die and an upper die that are horizontally set and have a coaxial center line, the upper die includes an upper die frame, an upper die pressing block, a center punching upper punch, and an upper die core with a spherical pit at the bottom, and the upper die core and the center punching upper punch are fixedly connected Below the upper die frame, the upper die pressing block is movably arranged on the center punching upper punch and located in the upper die core; the lower die includes a lower die frame, a lower die core with a spherical boss on the top, a center punching lower punch, a pressure ring and an outer cylindrical punching tool holder, the lower die core and the outer cylindrical punching tool holder are fixedly connected to the upper part of the lower die frame, the pressure ring is movably arranged on the lower die core and located in the outer cylindrical punching tool holder, the center punching lower punch is embedded in the top end of the lower die core, and an outer cylindrical punching knife is fixedly connected to the top end of the outer cylindrical punching tool holder.

Description

Technical Field

[0001] The present technology relates to the field of cold working tooling and provides a spoke stamping processing combined die, which can be used to complete the four sub-processes of spoke stamping processing, namely, outer circle punching, stretching, center hole punching, and flanging at one time. Background Art

[0002] Spokes are the parts of a wheel that connect the rim and the hub. As a device that protects the rim and spokes of a vehicle wheel, the spokes are one of the important components of the wheel. They are characterized by a pair of circular cover plates, the diameter of which is close to the diameter of the rim, a hole larger than the wheel axis in the center of the cover plate, an opening near the edge of the cover plate, and an annular wheel plate at the edge of the cover plate, the curved surface of which can fit closely with the curved surface of the rim.

[0003] In the prior art, the spokes are mostly made of plates with good ductility, and are mainly cold-processed through three processes, namely, punching, stretching, and flanging. The thickness of the plates is 3 to 5 mm, but plates with a thickness of 4 mm are most commonly used.

[0004] The machine tools used to complete the above three processes are mostly presses.

[0005] In the blanking process, with the help of the blanking die (tool), the blank with the required contour shape and size is separated from the sheet material to prepare for the spoke processing. In essence, blanking is to use the cutting edge of the blanking die to shear the sheet material along the set contour line and separate it. This blank can be called a stretched blank.

[0006] In the stretching process, with the help of the stretching die (tool), the stretching blank is directly subjected to deformation force in the die and plastically deformed, so as to obtain a product part with a certain shape, size and performance to provide a blank for flanging. This blank can be called a flanging blank.

[0007] In the flanging process, the outer edge of the flanging blank is turned into a full edge by means of a flanging die (tool) to complete the stamping process of the spoke. In this process, the plastic flow of the material can be improved to avoid cracking or wrinkling.

[0008] The spokes processed through the above process have their constituent materials' tensile thinning and stress effectively reduced, and the stress tends to be balanced.

[0009] Although the above processing technology can meet the process requirements, it is divided into three processing steps, which requires three sets of molds to correspond to each other. During the processing, three workstations are also required to meet the needs, which increases the production cost, reduces the production efficiency, and is even more unsuitable for large-scale processing requirements.

[0010] In addition, based on the above processing methods, the consistency of the product is poor. Summary of the invention

[0011] The purpose of this technology is to provide a spoke stamping processing combined die, which can be used to complete the four sub-processes of spoke stamping processing, namely, outer circle punching, stretching, center hole punching, and flanging, at one time, and the product consistency is good.

[0012] The purpose of this technology is to achieve the following technical solutions:

[0013] A spoke stamping processing combined die, comprising a lower die and an upper die which are arranged horizontally and have a coaxial centerline, wherein the upper die is movably arranged on the upper part of the lower die; the upper die comprises an upper die frame with a coaxial centerline, an upper die pressing block, a center punching upper punch and an upper die core with a spherical pit at the bottom, the upper die core and the center punching upper punch are fixedly connected to the bottom of the upper die frame, the upper die pressing block is movably arranged on the center punching upper punch and is located in the upper die core; the lower die comprises a lower die frame with a coaxial centerline, a lower die core with a spherical boss on the top, a center punching lower punch, a pressure ring and an outer circle punching tool holder, the lower die core and the outer circle The punching tool holder is fixedly connected to the top of the lower die frame, the pressure ring is movably set on the lower die core and located in the outer cylindrical punching tool holder, the center punching lower punch is embedded in the top of the lower die core, and the outer cylindrical punching knife is fixedly connected to the top of the outer cylindrical punching tool holder; the outer edge of the bottom of the upper die core is used in conjunction with the outer cylindrical punching knife to form the spoke outer cylindrical punching die, and the center punching upper punch and the center punching lower punch are used in conjunction with the spoke center hole punching die; the inner edge of the bottom of the upper die core is used in conjunction with the spherical boss of the lower die core to form the spoke drawing die; the spoke drawing die is used in conjunction with the pressure ring to form the spoke flanging die.

[0014] When using:

[0015] The upper die is fixedly connected to the lower plane of the slider of the press through the upper die frame, and the lower die is fixedly connected to the lower table of the machine tool through the lower die frame. The press is started, and the upper die follows the slider upward. The upper die pressing block moves downward relative to the upper die frame, and part of it extends into the spherical pit. The blank holder moves upward until the upper end face of the blank holder is at the same height as the upper end face of the outer cylindrical blanking knife, and then the sheet metal is placed on the blank holder and the outer cylindrical blanking knife; the machine tool slider moves downward, and the upper die core moves downward along with the upper die frame. The outer edge of the upper die core first contacts the sheet metal, pressing the sheet metal against the upper plane of the blank holder and the outer cylindrical blanking knife and continuing to move downward to work with the outer cylindrical blanking knife to complete the spoke outer cylindrical blanking process and form a stretched blank; the machine tool slider continues to move downward, and the inner edge of the bottom of the upper die core continues to press down the stretched blank and press the blank holder downward. The spherical boss of the lower die core touches the stretched blank, and the stretched blank begins to stretch and deform. Continuing downward, the material stretching continues, and the outer circle of the stretched blank shrinks inward until the outer circle of the stretched blank is completely pulled into the gap groove inside the upper die core and outside the lower die core to form a flanged blank, completing the flanging process. At the same time, the upper die pressing block begins to contact and gradually press the flanging blank; the machine tool slide continues to descend, and the flanging blank begins to flanging, the upper die pressing block retracts, the center blanking upper punch extends out and contacts the center part of the flanging blank, continues to descend, and works together with the center punching lower punch to complete the spoke center hole punching process, and then the flanging blank is completely pressed into the cavity formed by the upper and lower die cores and the pressure ring to complete the flanging process of the flanging blank.

[0016] The beneficial effects of this technology are:

[0017] By using the above-mentioned spoke stamping processing combined die, four sub-processes of spoke stamping processing, namely, outer circle punching, stretching, center hole punching, and flanging, can be completed at one time, and the consistency of the product is good.

[0018] As an improvement of this technology, an upper die seat is fixedly connected between the upper die core and the upper die frame, a center punching upper punch seat is fixedly connected between the center punch and the upper die frame, a lower die seat is fixedly connected between the lower die core and the lower die frame, a blank holder ring seat is fixedly connected under the blank holder ring, and the outer circle blanking knife is a segmented outer circle blanking knife.

[0019] When the blank holder moves up to the highest point, the upper surface of the blank holder is at the same height as the upper end surface of the external cylindrical punching cutter but not lower than the spherical boss of the lower die core; the sum of the heights of the center punching upper punch and the center punching upper punch seat and the height of the upper die pressing material block is not less than one material thickness, and the central part of the upper end surface of each segmented external cylindrical punching cutter is lower in height than the two sides by one material thickness; one material thickness is 3~5mm, and the thickness is taken as 4mm.

[0020] As a further improvement of the present technology, the guide sleeve fixedly connected to the upper mold frame is movably arranged on the guide column fixedly connected to the lower mold frame.

[0021] The above improvement utilizes the advantages of the guide post slider pair so that the upper die is moved and arranged on the lower die to have a precise guiding effect.

[0022] As a further improvement to the present technology, a compression spring is further provided between the upper die base and the upper die pressing block.

[0023] This improvement provides pressure from the upper die block to the flanged blank by a compression spring. As the spring compression increases, the pressure also increases, pressing the flanged blank against the lower die core, reliably positioning the flanged blank, and facilitating subsequent processing.

[0024] As a further improvement of the present technology, the top end of a movable ejector rod movably arranged in the lower die frame abuts against the bottom surface of the blank holder seat.

[0025] This improvement can utilize the hydraulic pad of the press machine to provide power for the lifting and lowering of the blank holder seat and the blank holder ring, and is easy to implement.

[0026] As a further improvement of the present technology, a center punching hole penetrating the lower die core, the lower die seat and the lower die frame is opened on the lower die, and the hole diameter of the center punching hole is not less than the inner diameter of the center punching lower punch.

[0027] This improvement provides a conveying channel for the waste generated by the center hole punching process, which is beneficial to improving production efficiency.

[0028] The upper die frame and the lower die frame are both provided with threaded holes for connecting with the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural schematic diagram of a spoke stamping processing combined die.

[0030] Figure 2 It is a schematic diagram of the working state of a spoke stamping combined die.

[0031] Figure 3 yes Figure 2 AA view of the . DETAILED DESCRIPTION

[0032] The present technology is further described below in conjunction with the accompanying drawings:

[0033] See also Figure 1 , Figure 2 , Figure 3 A spoke stamping combined die shown comprises a lower die and an upper die which are arranged horizontally and have coaxial center lines, and the upper die is movably arranged above the lower die.

[0034] The upper die includes an upper die frame 1 with a coaxial centerline, an upper die pressing block 7, a center punching upper punch 9 and an upper die core 11 with a spherical pit at the bottom. The upper die core 11 and the center punching upper punch 9 are fixedly connected to the bottom of the upper die frame 1, and the upper die pressing block 7 is movably set on the center punching upper punch 9 and located in the upper die core 11.

[0035] The lower die includes a lower die frame 2 with a coaxial centerline, a lower die core 12 with a spherical boss on the top, a center punching lower punch 13, a pressure ring 15 and an outer cylindrical punching tool holder 17. The lower die core 12 and the outer cylindrical punching tool holder 17 are fixedly connected to the upper surface of the lower die frame 2. The pressure ring 15 is movably set on the lower die core 12 and is located in the outer cylindrical punching tool holder 17. The center punching lower punch 13 is embedded in the top end of the lower die core 12, and an outer cylindrical punching tool 18 is fixedly connected to the top end of the outer cylindrical punching tool holder 17.

[0036] The main bodies of the upper mold frame 1 and the lower mold frame 2 are both rectangular plate structures. A vertical guide column 3 is arranged at each of the four corners of the lower mold frame 2. A vertical light hole is opened at each of the four corners of the upper mold frame 1 to embed a guide sleeve 4 to cooperate with the guide column 3. The upper mold frame 1 and the lower mold frame 2 are connected through the guide column 3 and the guide sleeve 4.

[0037] The upper die frame 1 and the lower die frame 2 are both provided with threaded holes (not shown in the figure) for connection with a press.

[0038] A center positioning countersunk hole 101 for positioning and installing the center punching upper punch seat 8 and a positioning countersunk hole 102 for positioning and installing the upper die seat 5 are opened in the center of the lower part of the upper die frame 1, and a plurality of installation countersunk holes 103 for installing the compression spring 10 are provided which are centrally and symmetrically distributed.

[0039] The upper die seat 5 of an annular structure is fixed to the bottom surface of the upper die frame 1 by screws.

[0040] The center blanking upper punch seat 8 is arranged in the through hole 701 on the upper mold pressing block 7; the upper end of the center blanking upper punch seat 8 is fixed to the center positioning countersunk hole 101 opened in the center of the upper mold frame 1 by screws, and the other end is equipped with the center blanking upper punch 9.

[0041] A through hole 701 is provided at the center of the upper die pressing material block 7, a plurality of mounting countersunk holes 702 are provided on the upper end surface and are symmetrically distributed in the center, and a step 703 is provided on the upper part of the outer wall in the circumferential direction. The upper die pressing material block 7 and the center punching upper punch seat 8 form a guide column slider pair through the through hole 701 and the center punching upper punch seat 8, and the upper die pressing material block 7 is movably arranged on the center punching upper punch seat 8 and is located in the upper die seat 5.

[0042] A plurality of compression springs 10 have one end vertically disposed in the mounting countersunk hole 103 of the upper mold frame 1 and the other end abutting against the mounting countersunk hole 702 on the upper end surface of the upper mold pressing block 7 .

[0043] The upper mold core 11 is fixed to the upper mold base 5 by screws, and a countersunk hole 111 is provided at the upper part of the inner hole of the upper mold core 11, which corresponds to the circumferential boss 703 on the upper part of the outer wall of the upper mold pressing block 7. The circumferential boss 703 and the countersunk hole 111 together constitute the limit position limit device for the upper mold pressing block 7 to move downward in the upper mold base 5 and the upper mold core 11.

[0044] A spherical pit matching the outer side of the spoke is provided at the bottom of the upper die core 11. In fact, the bottom surface of the upper die core 11 is annular, the outer edge of the annular shape is the upper cutter of the spoke outer circle punching cutter, and the inner edge of the annular shape is the upper die of the spoke stretching die.

[0045] A central through hole 201 is provided at the center of the lower mold frame 2 , a central positioning countersunk hole 202 is provided at the center of the upper portion of the central through hole 201 , and four mounting through holes 203 are symmetrically distributed on the outer side of the central through hole 201 .

[0046] A center positioning countersunk hole 204 corresponding to the center positioning countersunk hole 202 is opened at the bottom of the ring-shaped lower mold base 6, and a positioning ring 19 is embedded in the center positioning countersunk hole 204 and the center positioning countersunk hole 202 to accurately position the lower mold base 6 on the lower mold frame 2, and the lower mold base 6 is fixedly installed on the lower mold frame 2 by screws.

[0047] The lower mold core 12 with a through hole in the center is fixed to the lower mold base 6 by screws.

[0048] The top of the lower mold core 12 is spherical, and its outer contour matches the inner side surface of the spoke.

[0049] The center punching lower punch 13 is fixedly buried at the top of the lower die core 12. The top surface of the center punching lower punch 13 is not higher than the top surface of the lower die core 12. Conventionally, the top surface of the center punching lower punch 13 is equal to the top surface of the lower die core 12.

[0050] The blank pressing ring seat 14 is sleeved outside the lower die seat 6 and the lower die core 12. A shoulder is convexly arranged on the outer edge of the lower end of the blank pressing ring seat 14, and a blank pressing ring 15 is fixedly connected to the top of the screw used by the blank pressing ring seat 14.

[0051] Four movable ejector rods 16 are movably arranged in the mounting through holes 203 on the lower die frame 2. The upper ends of the movable ejector rods 16 abut against the lower end surface of the blank holder 14, and the other ends are connected to the hydraulic pad ejector rods of the press.

[0052] The outer cylindrical blanking tool holder 17 is sleeved outside the blank holder seat 14 and the blank holder 15 and is fixedly connected to the lower die frame 2 by screws. A step 171 is protruded inwardly at the top of the outer cylindrical blanking tool holder 17, corresponding to the shoulder 141 protruded at the outer edge of the lower end of the blank holder seat 14, which is used to limit the upper limit position of the blank holder 15 in the outer cylindrical blanking tool holder 17.

[0053] An outer cylindrical punching knife 18 is fixedly connected to the top of the outer cylindrical blanking knife holder 17 . The outer cylindrical punching knife 18 is a segmented outer cylindrical punching knife. A plurality of segmented outer cylindrical punching knives 18 are fixedly buried in the outer cylindrical punching knife holder 17 by screws.

[0054] The difference between the sum of the heights of the center punch upper punch 9 and the center punch upper punch seat 8 and the height of the upper die pressing material block 7 is not less than one material thickness. Figure 3 As shown, there is a material thickness difference between the central part of the upper end surface of the segmented outer circle blanking cutter 18 and the two sides in the height direction, and the material thickness is 3 to 5 mm, and the commonly used thickness is 4 mm.

[0055] When the blank holder 15 moves upward to the limit position in the external cylindrical blanking tool holder 17 , the upper surface of the blank holder 15 is at the same height as the upper end surface of the segmented external cylindrical blanking tool 18 but not lower than the spherical boss of the lower mold core 12 .

[0056] In fact, there is a through hole that runs through the lower mold core 12, the lower mold base 6, and the lower mold frame 2. The diameter of the through hole is not less than the inner diameter of the center punching lower punch 13. The through hole is the center punching hole, which is used to provide a conveying channel for the waste generated by the center hole punching process.

[0057] The above-mentioned spoke stamping processing combined die, the outer edge of the bottom of the upper die core 11 is used in conjunction with the outer cylindrical punching knife 18 to form a spoke outer cylindrical punching die, the center punching upper punch 9 and the center punching lower punch 13 are used in conjunction with the spoke center hole punching die; the inner edge of the bottom of the upper die core 11 and the spherical boss of the lower die core 12 are used in conjunction with the spoke stretching die; the spoke stretching die is used in conjunction with the pressure ring 15 to form a spoke flanging die.

[0058] The following is a detailed description of the method of using this technology in conjunction with the accompanying drawings:

[0059] When in use, the upper die frame 1 is connected to the lower plane of the slide block of the press by using the threaded hole, and the lower die frame 2 is connected to the lower table of the press. At the same time, the hydraulic pad push rod of the press is connected to the movable push rod 16.

[0060] Start the press, the upper die part follows the slider upward, and the upper die pressing block 7 moves downward relative to the upper die frame 1 in an ejected state under the action of the compression spring 10. The hydraulic pad push rod of the press acts on the four movable push rods 16 to make the blank holder seat 14 and the blank holder 15 of the lower die move upward relative to the lower die frame. The blank holder 15 extends to the same height as the upper plane of the blank holder 15 and the upper plane of the external cylindrical punching knife 18, and the sheet 20 is placed on the upper planes of the blank holder 14 and the external cylindrical punching knife 18.

[0061] The slide of the press moves downward, and the upper die core 11 moves downward along with the upper die frame 1. The lower plane of the outer edge of the upper die core 11 first contacts the sheet 20, pressing the sheet 20 against the upper plane of the blank holder 15 and the upper plane of the outer cylindrical blanking knife 18, and continues to move downward to complete the outer cylindrical blanking process of the spoke, forming a stretched blank.

[0062] The machine tool slide continues to descend, and the inner edge of the bottom of the upper mold core 11 continues to press down the stretched blank and compress the blank holder 15, the blank holder seat 14, the movable ejector rod 16 and the machine tool hydraulic pad downward, and the spherical boss of the lower mold core 12 touches the stretched blank, and the stretched blank begins to undergo material stretching deformation. As the upper mold core continues to descend to continue the material stretching, the outer circle of the stretched blank shrinks inward until the outer circle of the stretched blank is completely pulled into the gap between the upper mold core 11 and the lower mold core 12 to form a flanging blank, completing the flanging process, and at the same time, the upper mold pressing block 7 begins to contact and gradually compacts the flanging blank.

[0063] The machine tool slider continues to descend and starts flanging the flanged blank. The upper die pressing block 7 is compressed and the compression spring 10 retracts. The center blanking upper punch 9 extends out and contacts the center part of the flanged blank and continues to descend to cooperate with the center punching lower punch 13 to complete the spoke center hole punching process. Then the flanged blank is completely pressed into the cavity formed by the upper die core 11, the lower die core 12 and the pressure ring 15 to complete the flanging process of the flanged blank.

[0064] The stamping process of one spoke is completed.

[0065] The press slide moves upward to carry out the next operation cycle.

[0066] The beneficial effects of this technology are:

[0067] By using the above-mentioned spoke stamping processing combined die, four sub-processes in the spoke stamping processing, namely, outer circle punching, stretching, center hole punching, and flanging, can be completed at one time, with a high degree of automation and good product consistency.

Claims

1. A spoke stamping combined die, comprising a lower die and an upper die arranged horizontally and coaxially with respect to the center line, wherein the upper die is movably arranged above the lower die, and wherein: The upper die comprises an upper die frame with a coaxial center line, an upper die pressing block, a center punching upper punch and an upper die core with a spherical pit at the bottom. The upper die core and the center punching upper punch are fixedly connected to the bottom of the upper die frame. The upper die pressing block is movably arranged on the center punching upper punch and is located in the upper die core. The lower die comprises a lower die frame with a coaxial center line, a lower die core with a spherical boss on the top, a center punching lower punch, a blank holder and an outer cylindrical blanking tool holder. The lower die core and the outer cylindrical blanking tool holder are fixedly connected to the top of the lower die frame. The blank holder is movably arranged on the The lower die core is located in the outer circle punching tool holder, the center punching lower punch is embedded in the top of the lower die core, and the outer circle punching tool holder is fixedly connected with the outer circle punching tool at the top; the outer edge of the bottom of the upper die core is used in conjunction with the outer circle punching tool to form the spoke outer circle punching die, and the center punching upper punch and the center punching lower punch are used in conjunction with each other to form the spoke center hole punching die; the inner edge of the bottom of the upper die core is used in conjunction with the spherical boss of the lower die core to form the spoke stretching die; the spoke stretching die is used in conjunction with the blank holder to form the spoke flanging die; As the upper die core continues to move downward to stretch the material, the outer circle of the stretched blank shrinks inward until the outer circle of the stretched blank is completely pulled into the gap between the upper die core and the outer groove of the lower die core to form a flanging blank; the flanging blank is completely pressed into the cavity surrounded by the upper die core, the lower die core and the pressure ring to complete the flanging of the flanging blank.

2. The spoke stamping assembly die according to claim 1, characterized in that: An upper die seat is fixedly connected between the upper die core and the upper die frame, a center punching upper punch seat is fixedly connected between the center punching upper punch and the upper die frame, a lower die seat is fixedly connected between the lower die core and the lower die frame, a blank holder ring seat is fixedly connected under the blank holder ring, and the outer circle blanking knife is a segmented outer circle blanking knife.

3. The spoke stamping assembly die according to claim 1 or 2, characterized in that: When the blank holder moves up to the highest point, the upper surface of the blank holder is at the same height as the upper end surface of the external cylindrical punching cutter but not lower than the spherical boss of the lower die core; the sum of the heights of the center punching upper punch and the center punching upper punch seat and the height of the upper die pressing material block is not less than one material thickness, and the central part of the upper end surface of each segmented external cylindrical punching cutter is lower in height than the two sides by a material thickness; one material thickness is 3~5mm.

4. The spoke stamping assembly die according to claim 1, characterized in that: The guide sleeve fixedly connected to the upper die frame is movably arranged on the guide column fixedly connected to the lower die frame.

5. The spoke stamping assembly die according to claim 1, characterized in that: A compression spring is also arranged between the upper die seat and the upper die pressing block.

6. The spoke stamping assembly die according to claim 1, characterized in that: The top end of a movable ejecting rod movably arranged in the lower die frame abuts against the bottom surface of the blank holder ring seat.

7. The spoke stamping assembly die according to claim 1, characterized in that: A central punching hole penetrating the lower die core, the lower die seat and the lower die frame is provided on the lower die. The diameter of the central punching hole is not less than the inner diameter of the central punching lower punch.

8. The spoke stamping assembly die according to claim 1, characterized in that: The upper die frame and the lower die frame are both provided with threaded holes for connecting with the machine tool.

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