A stamping method for automobile swing arm shaft sleeve connecting plate

Abstract

The present invention relates to the field of automobile parts stamping technology, specifically a stamping method for automobile swing arm shaft sleeve connecting plate, including a base, a spacer and a top seat, and also including an upper die assembly, a side thrust assembly, a punching hole, a lower die assembly and a positioning column, wherein the top seat is arranged above the base, the surface of the base is structured with a stamping groove, the spacer is arranged on the surface of the base, and the spacer is located in the middle of the stamping groove, the bottom surface of the top seat is structured with a slot adapted to the spacer, the upper die assembly is mounted on the top seat, the side thrust assembly is mounted on the base, and the bottom surface of the top seat is mounted with a fitting block located directly above the side thrust assembly. The present invention fully guarantees the stamping accuracy of the aluminum alloy blank and the strength of the automobile swing arm shaft sleeve connecting plate by pre-puncturing the stamping part to form a notch, and simultaneously applying pressure to the aluminum alloy blank from the upper and lower sides.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts stamping, in particular to a stamping method for an automobile swing arm shaft sleeve connecting plate. Background Art

[0002] The automobile swing arm bushing connection plate is an important component in the automobile suspension system, which plays a connecting role between the control arm and the vehicle chassis or frame. The swing arm bushing connection plate is located at one end of the control arm and is usually fixed to the vehicle chassis or frame by several bolts. It carries the force of the control arm and allows the control arm to move in a direction perpendicular to the axle.

[0003] The automobile swing arm shaft sleeve connecting plate is divided into an upper swing arm shaft sleeve connecting plate and a lower swing arm shaft sleeve connecting plate. The upper swing arm shaft sleeve connecting plate connects the upper control arm and the vehicle body and is located at the upper part of the suspension system. The design needs to consider that it bears a large vertical load and the lateral force of the suspension system. The lower swing arm shaft sleeve connecting plate connects the lower control arm and the vehicle body and is located at the lower part of the suspension system. The design needs to consider the forces that the shock absorber and suspension system are subjected to during acceleration, braking and cornering. For the lower swing arm shaft sleeve connecting plate, in consideration of the lightweight design of the automobile and to ensure the rigidity and durability of the lower swing arm shaft sleeve connecting plate, the lower swing arm shaft sleeve connecting plate is usually made of high-strength aluminum alloy through a stamping process.

[0004] The stamping process of the lower arm sleeve connecting plate is divided into a drawing process, a trimming process, a punching process and a flanging process in order. In the punching process, the punching accuracy is very important. If the punching position is not accurate enough, it will cause the lower arm sleeve connecting plate to be unable to align during assembly or affect the suspension geometry. In order to ensure the punching accuracy, conventional means can ensure the punching accuracy by limiting the blank. For example, a stamping forming device for an automobile arm part with application number CN201822143504.5 ensures the stamping accuracy by limiting the stamping part. Compared with traditional steel, the high-strength aluminum alloy selected to ensure the strength of the lower arm sleeve connecting plate has higher hardness and strength as well as tensile strength and yield strength, and the difficulty and complexity of plastic deformation during stamping are higher. Since high-strength aluminum alloys have higher hardness and strength, they can withstand large stress when subjected to force. Therefore, it is difficult for high-strength aluminum alloys to evenly distribute stress when they are locally deformed. In addition, during the stamping process, the aluminum alloy material has local uneven hardness and tiny defects. These defects will cause stress concentration in certain areas, which in turn causes cracks to form and expand during the stamping of high-strength aluminum alloy, resulting in deviations in the size of the round holes after stamping. The cracks also make it impossible to guarantee the strength of the lower arm sleeve connecting plate.

[0005] Therefore, a stamping method for a connecting plate of an automobile swing arm sleeve is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a stamping method for an automobile swing arm shaft sleeve connecting plate, which solves the problem of local stress concentration caused by uneven local hardness of aluminum alloy materials during stamping and formation of cracks in the subsequent stamping process. By pre-puncturing the stamping position to form a notch and applying pressure to the aluminum alloy blank from the upper and lower sides at the same time, the stamping accuracy of the aluminum alloy blank and the strength of the automobile swing arm shaft sleeve connecting plate are fully guaranteed.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The invention relates to a stamping device for a connecting plate of an automobile swing arm shaft sleeve, comprising a base, a spacer and a top base, and also comprising an upper die assembly, a side push assembly, a punching hole, a lower die assembly and a positioning column, wherein the top base is arranged above the base, the surface of the base is structured with a punching groove, the spacer is arranged on the surface of the base, and the spacer is located in the middle of the punching groove, the bottom surface of the top base is structured with a slot adapted to the spacer, the upper die assembly is mounted on the top base, the side push assembly is mounted on the base, a fitting block located directly above the side push assembly is mounted on the bottom surface of the top base, the fitting block presses the top of the side push assembly downward during the process of the top base moving down and fitting with the base, the side push assembly pushes the aluminum alloy blank to fit tightly against the edge of the punching groove, the surface of the base is structured with a punching hole connected to the punching groove, a lower die assembly moving vertically along the punching hole is mounted on the base, the side push assembly drives the lower die assembly to move upward to the inside of the punching hole, the positioning column is mounted on the surface of the base, and the bottom surface of the top base is structured with a positioning groove adapted to the positioning column.

[0009] Taking into account the characteristics of high-strength aluminum alloy materials, due to their high hardness and strength, a greater stamping force is required to form the desired shape during the stamping process; due to their high material hardness, tensile strength and yield strength, the difficulty and complexity of plastic deformation during stamping increase. The above reasons are superimposed on each other, resulting in stamping aluminum alloys requiring higher blanking pressures and more complex blanking processes. However, when high blanking pressures are applied, it is very difficult to adjust the blanking pressure during the blanking process. Therefore, by applying higher blanking pressures to stamp high-strength aluminum alloys, on the one hand, the blanking process design is difficult, and on the other hand, the stamping parts of the high-strength aluminum alloy blanks will have fault-like cracks, and the punched holes are not round enough.

[0010] In the present technical scheme, during the process of the top seat moving down and fully fitting with the base, the aluminum alloy blank is pushed horizontally at a uniform speed with the help of the side push assembly. When the upper die assembly contacts the aluminum alloy blank, the stamping part of the aluminum alloy blank is punctured and broken, thereby avoiding local stress concentration at the stamping part of the aluminum alloy blank. In addition, during stamping, the lower die assembly moves up slightly to extrude the aluminum alloy blank from the inside of the stamping part from bottom to top. When the aluminum alloy blank located between the inner periphery of the circular hole and the outer periphery of the extrusion ring moves down and is involved under the extrusion action of the punch, the extrusion ring pushes the stamping part of the aluminum alloy blank from bottom to top, thereby avoiding the high blanking pressure acting on the edge of the stamping part to cause the deformation error of the stamping edge of the aluminum alloy blank to expand, thereby ensuring the accuracy and strength requirements of the automobile swing arm sleeve connecting plate stamped from high-strength aluminum alloy material.

[0011] After the aluminum alloy blank has been drawn and trimmed, its surface and bottom are both flat. To prevent the aluminum alloy blank from moving during stamping, the aluminum alloy blank needs to be fixed in position. There are many ways to fix the aluminum alloy blank in position. For example, the mold can be slotted and the aluminum alloy blank can be placed in the slot. The aluminum alloy blank can also be clamped and fixed by a clamp. The above methods all require the aluminum alloy blank to be placed precisely, and the aluminum alloy blank must be taken out of the slot or the clamp must be released after the stamping is completed, which takes a lot of time and has a significant negative impact on the stamping efficiency of the automobile swing arm sleeve connecting plate. For this reason, the present technical solution adopts the method of pushing the aluminum alloy blank from the side.

[0012] Preferably, the side thrust assembly includes a limit frame, a transverse rod, a stopper, a vertical rod, a first gear, a second gear, an end block and an extrusion plate. The limit frame is fittedly mounted on the surface of the base, and a matching vertical groove is constructed between the limit frame and the surface of the base. The transverse rod is slidably mounted inside the limit frame, and a horizontal tooth groove is constructed at the bottom of the transverse rod. The stopper is mounted between the inner walls of the limit frame, and the stopper is arranged on the side of the transverse rod close to the vertical groove. The vertical rod is slidably mounted in the vertical groove, and a vertical tooth groove is constructed on the side wall of the vertical rod. The first gear and the second gear are both mounted on the bottom of the limit frame, and the first gear and the second gear are respectively meshed with the vertical tooth groove and the horizontal tooth groove. The first gear and the second gear are connected by a chain transmission. The end block is mounted on the end of the transverse rod, and the extrusion plate is mounted on the end of the end block.

[0013] After the aluminum alloy blank is quickly placed in the stamping groove, during the downward movement of the top seat, there is still a certain distance between the aluminum alloy blank and the arc-shaped edge of the stamping groove. In order to press the aluminum alloy blank against the arc-shaped edge of the stamping groove, the transverse rod moves horizontally during the downward movement of the vertical rod, thereby pressing the aluminum alloy blank tightly against the arc-shaped edge of the stamping groove. When the aluminum alloy blank is stamped, the aluminum alloy blank is effectively prevented from shaking, thereby helping to protect the stamping accuracy of the aluminum alloy blank.

[0014] Preferably, the lower mold assembly includes a bottom bar, an extrusion ring, a vertical rack, a guide column, a third gear, a first connecting shaft, a fourth gear, a fifth gear and a second connecting shaft. The guide column is installed inside the base, the bottom bar is fixed between the tops of the guide columns, the extrusion ring is fitted on the surface of the bottom bar, the vertical rack is symmetrically installed on the bottom of the bottom bar, the first connecting shaft is installed inside the base, the third gear is sleeved on the outer periphery of the first connecting shaft, and the third gear is meshed with the vertical rack, the fourth gear is sleeved on the end of the first connecting shaft, the second connecting shaft passes through the inner periphery of the first gear, the fifth gear is sleeved on the end of the second connecting shaft, and the fifth gear is meshed with the fourth gear.

[0015] When the upper die assembly moves downward to stamp the aluminum alloy blank, the lower die assembly moves upward from the inside of the stamping part, reversely extruding the aluminum alloy blank moving downward, thereby reducing the deformation of the stamping part of the aluminum alloy blank, thereby further ensuring the stamping accuracy of the aluminum alloy blank.

[0016] Preferably, the upper die assembly includes a positioning block, an annular sleeve, a cylindrical rod, a circular ring, a coil spring, an arc plate, a punch, an extrusion head and a fixing stud, the positioning block is embedded in the surface of the top seat, the fixing stud passes through the positioning block and is screwed to the top seat, the annular sleeve is fitly installed on the inner circumference of the positioning block, the cylindrical rod is slidably fitted on the inner circumference of the annular sleeve, the top seat is structured with a circular hole adapted to the cylindrical rod, the circular ring and the coil spring are both arranged in the circular hole, and the circular ring is fixed on the outer circumference of the cylindrical rod, the top end of the coil spring abuts against the circular ring, the arc plate is installed at the bottom of the cylindrical rod, the punch and the extrusion head are both installed at the bottom of the arc plate, and the bottom of the extrusion head extends to below the punch.

[0017] When the aluminum alloy blank has local uneven hardness and tiny defects, and the defects cause stress concentration in certain areas, the upper die assembly moves downward with the top seat, and the extrusion head first pierces the aluminum alloy blank. Then, when the side push assembly pushes the aluminum alloy blank horizontally, the aluminum alloy blank is continuously broken, so that a notch exists on the inner side of the stamping part of the aluminum alloy blank, thereby avoiding local stress concentration that causes cracks to form and crack propagation during stamping of the aluminum alloy blank.

[0018] Preferably, a limiting block is installed on the surface of the limiting frame, and a side wall of the vertical rod is constructed with a limiting groove adapted to the limiting block.

[0019] During the horizontal movement of the side thrust assembly, the end block can slide along the limiting slide groove, thereby limiting the movement trajectory of the end block, which is beneficial to maintaining the stability of the end block during movement.

[0020] Preferably, a connecting block is installed on the side wall of the vertical rod, and a tension spring is installed between the connecting block and the limiting block.

[0021] When the top seat returns to its original position, under the action of the tension spring, the tension spring contracts to assist the vertical rod to move upward and return to its original position.

[0022] Preferably, a limiting slide groove is constructed on the surface of the base, the limiting slide groove is located on the side of the partition bar away from the side thrust assembly, the bottom of the end block is in contact with the limiting slide groove, the side wall of the partition bar is constructed with a limiting through groove, and the transverse rod passes through the limiting through groove.

[0023] Preferably, the extrusion head is configured to be arc-shaped, and the bottom of the extrusion head is configured to be wedge-shaped.

[0024] The extrusion cross-sectional area of ​​the arc-shaped extrusion head is small, and the resistance encountered during the horizontal movement of the extrusion head driven by the side push assembly is small. In addition, the extrusion head with a wedge-shaped bottom can easily pierce the aluminum alloy blank, thereby avoiding the problem of local stress concentration in the aluminum alloy blank causing cracks and crack propagation during subsequent stamping.

[0025] Preferably, the extrusion head is arranged on the inner periphery of the punch close to one side of the partition bar.

[0026] The extrusion head is arranged on the inner periphery of the punch near the spacer bar, so that a crack as large as possible can be formed at the stamping part of the aluminum alloy blank when the aluminum alloy blank moves to fit closely with the edge of the stamping groove.

[0027] A stamping method comprises the following steps:

[0028] S1. Placing the aluminum alloy blank after the drawing and trimming process in the stamping groove, and keeping the straight edge of the aluminum alloy blank in contact with the side wall of the partition bar;

[0029] S2. The top seat is driven downward by an external lifting device. During the bonding process between the top seat and the base, the bonding block first contacts the top of the vertical rod, and the vertical rod moves downward along the vertical groove. The vertical rod controls the horizontal movement of the transverse rod through the vertical tooth groove, the transverse rod, the horizontal tooth groove, the first gear and the second gear. The transverse rod pushes the aluminum alloy blank to move toward the arc edge of the stamping groove through the end block and the extrusion plate.

[0030] S3. When the aluminum alloy blank is about to fit with the arc edge of the stamping groove, the extrusion head in the upper die assembly is at the lowest point, and the wedge-shaped extrusion head first contacts the edge of the stamping part on the surface of the aluminum alloy blank, pierces the surface of the aluminum alloy blank from the inside of the stamping part, and continues to break the aluminum alloy blank during the subsequent movement of the aluminum alloy blank;

[0031] S4. When the aluminum alloy blank is completely pressed against the arc edge of the stamping groove, the bottom surface of the arc plate contacts the surface of the aluminum alloy blank. At this time, the punch extrude the aluminum alloy blank downward along the edge of the annular punching part, and the lower die assembly slowly moves upward through the side push assembly. The extrusion ring extrude the aluminum alloy blank from the bottom of the aluminum alloy blank. Since the extrusion ring is located on the inner side of the punch, it prevents the stamping part from deforming beyond the range when the aluminum alloy blank is stamped.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention provides an upper die assembly and a side push assembly. When the top seat drives the upper die assembly downward, the extrusion head can pierce the aluminum alloy blank, and the top seat applies pressure to the side push assembly, and the transverse rod extends to push the aluminum alloy blank to move horizontally, thereby forming a notch on the inner side of the stamping part of the aluminum alloy blank. During subsequent stamping, it is avoided that the stress cannot be evenly distributed during stamping of the aluminum alloy blank due to local stress concentration in the aluminum alloy blank, thereby avoiding the formation and expansion of cracks during stamping of the aluminum alloy blank, and fully ensuring the stamping accuracy of the aluminum alloy blank and the strength of the automobile swing arm shaft sleeve connecting plate formed by stamping.

[0034] 2. The present invention provides a lower die assembly and a side push assembly. When the side push assembly is acted upon by the top seat, the side push assembly drives the lower die assembly to move upward, and the extrusion ring in the lower die assembly extrude the aluminum alloy blank from the inner side of the stamping part of the aluminum alloy blank, thereby offsetting the effect of the stamping part of the aluminum alloy blank extending downward due to the downward movement of the punch, thereby avoiding the over-range deformation of the stamping part and causing the punching size error.

[0035] 3. The present invention provides an upper die assembly and a lower die assembly. When the upper die assembly moves downward, the lower die assembly moves upward, and the aluminum alloy blank is stamped from the top and bottom of the aluminum alloy blank at the same time. While quickly cutting off the aluminum alloy material at the stamping part, the deformation of the stamping part can be greatly reduced, so as to control the deformation of the stamping part within a controllable range, thereby helping to ensure the stamping accuracy of the aluminum alloy blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 An exploded view of the overall structure of the present invention;

[0038] Figure 3 An exploded view of the base of the present invention;

[0039] Figure 4 is a cross-sectional view of the top seat of the present invention;

[0040] Figure 5 It is a structural schematic diagram of the side thrust assembly of the present invention;

[0041] Figure 6 is a cross-sectional view of a thrust assembly of the present invention;

[0042] Figure 7 is a state diagram of the thrust assembly of the present invention;

[0043] Figure 8 It is a structural schematic diagram of the lower mold assembly of the present invention;

[0044] Fig. 9 It is a structural schematic diagram of the curved plate of the present invention;

[0045] Fig.10 It is a schematic diagram of the process of the side thrust assembly of the present invention.

[0046] In the figure: 1, base; 2, spacer; 3, top seat; 4, upper die assembly; 41, positioning block; 42, annular sleeve; 43, cylindrical rod; 44, ring; 45, spiral spring; 46, arc plate; 47, punch; 48, extrusion head; 49, fixing stud; 5, side thrust assembly; 51, limit frame; 52, transverse rod; 521, horizontal tooth groove; 53, stopper; 54, vertical rod; 541, vertical tooth groove; 55, limit block; 551, tension spring; 552, connection Block; 56, first gear; 57, second gear; 58, end block; 59, extrusion plate; 6, limit slide groove; 7, punching hole; 8, lower die assembly; 81, bottom bar; 82, extrusion ring; 83, vertical rack; 84, guide column; 85, third gear; 86, first connecting shaft; 87, fourth gear; 88, fifth gear; 89, second connecting shaft; 9, positioning column; 10, straight groove; 11, limit through groove; 12, vertical groove; 13, fitting block; 14, stamping groove. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figures 1 to 10 The present invention provides a stamping method for a connecting plate of a swing arm sleeve of an automobile, and the technical scheme is as follows:

[0049] A stamping device for a connecting plate of an automobile swing arm sleeve comprises a base 1, a spacer 2 and a top seat 3, and also comprises an upper die assembly 4, a side thrust assembly 5, a punching hole 7, a lower die assembly 8 and a positioning column 9. The top seat 3 is arranged above the base 1, and the top seat 3 is controlled to move up and down by an external lifting device. The external lifting device can be one or more of an electric lifting rod and a hydraulic cylinder. The specific design and selection can be made according to the actual stamping requirements, and no further description is given here. A stamping groove 14 is constructed on the surface of the base 1, and the spacer 2 is arranged on the surface of the base 1, and the spacer 2 is located in the middle of the stamping groove 14. The bottom surface of the top seat 3 is constructed with a straight groove 10 adapted to the spacer 2. The upper die assembly Part 4 is installed on the top seat 3, and the side push assembly 5 is installed on the base 1. The bottom surface of the top seat 3 is installed with a fitting block 13 located directly above the side push assembly 5. The fitting block 13 presses the top of the side push assembly 5 downward when the top seat 3 moves down and fits with the base 1. The side push assembly 5 pushes the aluminum alloy blank to fit tightly against the edge of the punching groove 14. The surface of the base 1 is configured with a punching hole 7 connected to the punching groove 14. A lower die assembly 8 that moves vertically along the punching hole 7 is installed on the base 1. The side push assembly 5 drives the lower die assembly 8 to move up to the inside of the punching hole 7. The positioning column 9 is installed on the surface of the base 1, and the bottom surface of the top seat 3 is configured with a positioning groove that is adapted to the positioning column 9.

[0050] After the aluminum alloy blank has been drawn and trimmed, its surface and bottom surface are both flat. In order to prevent the aluminum alloy blank from moving during stamping, the aluminum alloy blank needs to be limited and fixed. As an embodiment of the present invention, refer to Figure 2 and Figure 5-7The side thrust assembly 5 includes a limit frame 51, a transverse rod 52, a stopper 53, a vertical rod 54, a first gear 56, a second gear 57, an end block 58 and an extrusion plate 59. The limit frame 51 is fitted on the surface of the base 1, and a matching vertical groove 12 is constructed between the limit frame 51 and the surface of the base 1. The transverse rod 52 is slidably installed inside the limit frame 51, and a horizontal tooth groove 521 is constructed at the bottom of the transverse rod 52. The stopper 53 is installed between the inner walls of the limit frame 51, and the stopper 53 is arranged on the side of the transverse rod 52 close to the vertical groove 12. The vertical rod 54 is slidably arranged in the vertical groove 12, and a vertical tooth groove 541 is constructed on the side wall of the vertical rod 54. The first gear 56 and the second gear 57 are both installed at the bottom of the limit frame 51, and the first gear 56 and the second gear 57 are respectively meshed with the vertical tooth groove 541 and the horizontal tooth groove 521. The first gear 56 and the second gear 57 are connected through a chain transmission, the end block 58 is installed at the end of the transverse rod 52, and the extrusion plate 59 is installed at the end of the end block 58. After the aluminum alloy blank is quickly placed in the stamping groove 14, the top seat 3 moves downward under the action of the external lifting equipment. When the top seat 3 moves to a certain height, the bottom surface of the bonding block 13 is bonded with the top of the vertical rod 54. Subsequently, when the top seat 3 moves downward, the vertical rod 54 is subjected to the downward pressure and moves downward along the vertical groove 12. The vertical rod 54 drives the first gear 56 to rotate through the vertical tooth groove 541, and the first gear 56 drives the second gear 57 to rotate through the chain. At this time, the second gear 57 drives the transverse rod 52 to move horizontally through the horizontal tooth groove 521, and the end block 58 and the extrusion plate 59 move horizontally with the transverse rod 52, pushing the aluminum alloy blank toward the arc edge side of the stamping groove 14.

[0051] After the bottom of the upper die assembly 4 contacts the aluminum alloy blank, the aluminum alloy blank continues to move toward the arc edge side of the punching groove 14 under the action of the side push assembly 5. Fig.10 The moving trajectory of the aluminum alloy billet is shown in the figure. During the subsequent movement of the aluminum alloy billet, since the vertical position of the extrusion head 48 remains unchanged and the aluminum alloy billet continues to move horizontally, a notch will be formed at the stamping portion of the aluminum alloy billet, and since the extrusion head 48 is located on the inner side of the punch 47, the length of the notch formed will be smaller than the diameter of the stamping portion.

[0052] In order to avoid the local stress concentration in the aluminum alloy blank, which may cause cracks to form and spread in the stamping part during stamping, as an embodiment of the present invention, refer to Figure 3 and Figure 8The lower mold assembly 8 includes a bottom bar 81, an extrusion ring 82, a vertical rack 83, a guide column 84, a third gear 85, a first connecting shaft 86, a fourth gear 87, a fifth gear 88 and a second connecting shaft 89. The guide column 84 is installed inside the base 1, the bottom bar 81 is fixed between the tops of the guide columns 84, the extrusion ring 82 is fitted on the surface of the bottom bar 81, the vertical rack 83 is symmetrically installed at the bottom of the bottom bar 81, the first connecting shaft 86 is installed inside the base 1, the third gear 85 is sleeved on the outer periphery of the first connecting shaft 86, and the third gear 85 is meshed with the vertical rack 83, the The fourth gear 87 is sleeved on the end of the first connecting shaft 86, the second connecting shaft 89 passes through the inner circumference of the first gear 56, the fifth gear 88 is sleeved on the end of the second connecting shaft 89, and the fifth gear 88 is meshed with the fourth gear 87. When the first gear 56 rotates, the second connecting shaft 89 rotates coaxially with the first gear 56, so that the fifth gear 88 rotates accordingly, and the fifth gear 88 drives the third gear 85 to rotate through the fourth gear 87 and the first connecting shaft 86. Under the action of the third gear 85, the vertical rack 83 moves upward, so that the bottom bar 81 moves upward together with the extrusion ring 82. When the bottom of the aluminum alloy blank contacts, pressure is applied from below the aluminum alloy blank to reversely extrude the aluminum alloy blank moving downward, thereby reducing the deformation of the stamping portion of the aluminum alloy blank. The top of the extrusion ring 82 is an annular wedge shape. When the top of the extrusion ring 82 contacts the aluminum alloy blank, the aluminum alloy blank can be quickly cut open. At this time, since the stamping portion of the aluminum alloy blank passes through the notch pre-formed by the upper die assembly 4, the length of the connected portion between the materials of the stamping portion of the aluminum alloy blank is effective. When the extrusion ring 82 and the punch 47 apply pressure to the stamping portion together, the aluminum alloy blank material at the stamping portion can be quickly cut off to prevent In order to prevent the stamping parts of the aluminum alloy blank from being entangled and causing the size of the stamping parts to be larger than the designed stamping size, the base 1 is internally constructed with a cavity which can fully accommodate the lower die assembly 8. The shape of the cavity is designed to ensure that the bottom strip 81 can move vertically in the cavity as much as possible to ensure that the extrusion ring 82 and the punching hole 7 keep moving in the same vertical direction so that the extrusion ring 82 can smoothly enter the punching hole 7. At the same time, the first connecting shaft 86 and the second connecting shaft 89 are both limited and fixed by the bearings to avoid displacement of the first connecting shaft 86 and the second connecting shaft 89 during rotation, which may cause misalignment between gears and lose the transmission effect.

[0053] As an embodiment of the present invention, refer to Figure 1 , Figure 2 , Figure 4 and Fig. 9The upper die assembly 4 includes a positioning block 41, an annular sleeve 42, a cylindrical rod 43, a ring 44, a coil spring 45, an arc plate 46, a punch 47, an extrusion head 48 and a fixing stud 49. The positioning block 41 is embedded in the surface of the top seat 3. The fixing stud 49 passes through the positioning block 41 and is screwed to the top seat 3. The annular sleeve 42 is fitted on the inner circumference of the positioning block 41. The cylindrical rod 43 is slidably fitted on the inner circumference of the annular sleeve 42. The top seat 3 is constructed with a circular hole adapted to the cylindrical rod 43. The ring 44 and the coil spring 45 are both arranged in the circular hole, and the ring 44 is fixed on the cylindrical rod 4 3, the top of the coil spring 45 abuts against the ring 44, the arc plate 46 is installed at the bottom of the cylindrical rod 43, the punch 47 and the extrusion head 48 are both installed at the bottom of the arc plate 46, and the bottom of the extrusion head 48 extends to the bottom of the punch 47. When the upper die assembly 4 moves downward with the top seat 3, the extrusion head 48 first pierces the aluminum alloy blank, and then when the side push assembly 5 pushes the aluminum alloy blank horizontally, the aluminum alloy blank is continuously broken, so that there is a notch inside the stamping part of the aluminum alloy blank, thereby avoiding the formation of cracks and crack propagation when the aluminum alloy blank is stamped due to local stress concentration. The extrusion head 48 is configured to be arc-shaped, and the bottom of the extrusion head 48 is configured to be wedge-shaped. The extrusion cross-sectional area of ​​the arc-shaped extrusion head 48 is small, and the resistance encountered during the horizontal movement of the extrusion head 48 driven by the side push assembly 5 is small. In addition, the extrusion head 48 with a wedge-shaped bottom can easily pierce the aluminum alloy blank, thereby avoiding the problem of local stress concentration in the aluminum alloy blank, which may cause cracks in the stamping part of the aluminum alloy blank during subsequent stamping and the problem of crack propagation. The extrusion head 48 is configured to be close to the partition bar 2 on the inner periphery of the punch 47. The extrusion head 48 is configured to be close to the partition bar 2 on the inner periphery of the punch 47. In the process of moving to fit tightly with the edge of the stamping groove 14, a gap as large as possible is formed at the stamping part of the aluminum alloy billet. The bottom of the extrusion head 48 is wedge-shaped. In the process of the upper die assembly 4 moving downward together with the top seat 3, the bottom of the extrusion head 48 first contacts the surface of the aluminum alloy billet. Combined with the shape setting of the extrusion head 48, a puncture hole can be formed on the surface of the aluminum alloy billet. In the subsequent process of the top seat 3 continuing to move downward, the transverse rod 52 in the side push assembly 5 continues to move toward the arc-shaped edge of the stamping groove 14. At this time, the side of the extrusion head 48 contacts the aluminum alloy billet and breaks the edge of the aluminum alloy billet to form a gap.

[0054] As an embodiment of the present invention, refer to Figure 1 and Figure 2 A limit block 55 is installed on the surface of the limit frame 51, and the side wall of the vertical rod 54 is constructed with a limit groove adapted to the limit block 55. When the transverse rod 52 moves horizontally, the end block 58 can slide along the limit slide groove 6, thereby limiting the moving trajectory of the end block 58 and maintaining the stability of the end block 58 when moving.

[0055] As an embodiment of the present invention, refer to Figure 6A connecting block 552 is installed on the side wall of the vertical rod 54, and a tension spring 551 is installed between the connecting block 552 and the limit block 55. Under the action of the tension spring 551, the tension spring 551 in the tension state contracts, and the auxiliary vertical rod 54 moves upward to return to its original position.

[0056] As an embodiment of the present invention, refer to Figure 2 and Fig.10 The surface of the base 1 is constructed with a limiting groove 6, and the limiting groove 6 is located on the side of the partition bar 2 away from the side thrust assembly 5. The bottom of the end block 58 is in contact with the limiting groove 6, and the side wall of the partition bar 2 is constructed with a limiting through groove 11. The transverse rod 52 passes through the limiting through groove 11. During the horizontal movement of the transverse rod 52, the limiting through groove 11 can limit the moving trajectory of the transverse rod 52 to ensure that the transverse rod 52 moves in a straight line.

[0057] A stamping method comprises the following steps:

[0058] S1, placing the aluminum alloy blank after the drawing and trimming process in the stamping groove 14, and keeping the straight edge of the aluminum alloy blank in contact with the side wall of the partition bar 2;

[0059] S2. The top seat 3 is driven downward by an external lifting device. During the bonding process between the top seat 3 and the base 1, the bonding block 13 first contacts the top of the vertical rod 54. The vertical rod 54 moves downward along the vertical groove 12. The vertical rod 54 controls the horizontal movement of the transverse rod 52 through the vertical tooth groove 541, the transverse rod 52, the horizontal tooth groove 521, the first gear 56 and the second gear 57. The transverse rod 52 pushes the aluminum alloy blank to move toward the arc edge of the stamping groove 14 through the end block 58 and the extrusion plate 59.

[0060] S3, when the aluminum alloy blank is about to fit with the arc edge of the stamping groove 14, the extrusion head 48 in the upper die assembly 4 is at the lowest point, and the extrusion head 48 with a wedge-shaped bottom first contacts the edge of the stamping part on the surface of the aluminum alloy blank, pierces the surface of the aluminum alloy blank from the inside of the stamping part, and continues to break the aluminum alloy blank during the subsequent movement of the aluminum alloy blank;

[0061] S4. When the aluminum alloy blank is completely pressed against the arc edge of the stamping groove 14, the bottom surface of the arc plate 46 contacts the surface of the aluminum alloy blank. At this time, the punch 47 extrude the aluminum alloy blank downward along the edge of the annular punching hole 7. The lower die assembly 8 slowly moves upward through the side push assembly 5. The extrusion ring 82 extrude the aluminum alloy blank from below the aluminum alloy blank. Since the extrusion ring 82 is located on the inner side of the punch 47, it prevents the stamping part from deforming beyond the range when the aluminum alloy blank is stamped.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stamping device for a connecting plate of a swing arm shaft sleeve of an automobile, comprising a base (1), a spacer bar (2) and a top seat (3), characterized in that: The invention also comprises an upper die assembly (4), a side thrust assembly (5), a punching hole (7), a lower die assembly (8) and a positioning column (9); the top seat (3) is arranged above the base (1); the surface of the base (1) is provided with a punching groove (14); the spacer bar (2) is arranged on the surface of the base (1), and the spacer bar (2) is located in the middle of the punching groove (14); the bottom surface of the top seat (3) is provided with a slot (10) adapted to the spacer bar (2); the upper die assembly (4) is mounted on the top seat (3); the side thrust assembly (5) is mounted on the base (1); and the bottom surface of the top seat (3) is provided with a fitting located directly above the side thrust assembly (5). The bonding block (13) presses the top of the side push assembly (5) downwards when the top seat (3) moves downwards and fits with the base (1), and the side push assembly (5) pushes the aluminum alloy blank to fit tightly against the edge of the punching groove (14). The surface of the base (1) is provided with a punching hole (7) connected to the punching groove (14). The base (1) is provided with a lower die assembly (8) that moves vertically along the punching hole (7). The side push assembly (5) drives the lower die assembly (8) to move upwards to the inside of the punching hole (7). The positioning column (9) is installed on the surface of the base (1), and the bottom surface of the top seat (3) is provided with a positioning groove that matches the positioning column (9). The upper die assembly (4) comprises a positioning block (41), an annular sleeve (42), a cylindrical rod (43), a circular ring (44), a coil spring (45), an arc plate (46), a punch (47), an extrusion head (48) and a fixing stud (49); the positioning block (41) is embedded in the surface of the top seat (3); the fixing stud (49) penetrates the positioning block (41) and is screwed to the top seat (3); the annular sleeve (42) is fitted on the inner circumference of the positioning block (41); the cylindrical rod (43) is slidably fitted on the annular sleeve (42) inner circumference, the top seat (3) is constructed with a circular hole adapted to the cylindrical rod (43), the circular ring (44) and the coil spring (45) are both arranged in the circular hole, and the circular ring (44) is fixed on the outer circumference of the cylindrical rod (43), the top end of the coil spring (45) abuts against the circular ring (44), the arc plate (46) is installed on the bottom of the cylindrical rod (43), the punch (47) and the extrusion head (48) are both installed on the bottom of the arc plate (46), and the bottom of the extrusion head (48) extends to below the punch (47); The extrusion head (48) is configured to be arc-shaped, and the bottom of the extrusion head (48) is configured to be wedge-shaped; The extrusion head (48) is arranged on the inner periphery of the punch (47) and close to the spacer bar (2); The side thrust assembly (5) comprises a limit frame (51), a transverse rod (52), a stopper (53), a vertical rod (54), a first gear (56), a second gear (57), an end block (58) and a pressing plate (59); the limit frame (51) is fitted on the surface of the base (1); a matching vertical groove (12) is formed between the limit frame (51) and the surface of the base (1); the transverse rod (52) is slidably mounted inside the limit frame (51); a horizontal tooth groove (521) is formed at the bottom of the transverse rod (52); the stopper (53) is mounted between the inner walls of the limit frame (51); and the stopper (53) is provided with a plurality of teeth. The first gear (56) and the second gear (57) are both mounted on the bottom of the limit frame (51), and the first gear (56) and the second gear (57) are respectively meshed with the vertical tooth groove (541) and the horizontal tooth groove (521). The first gear (56) and the second gear (57) are connected by a chain transmission. The end block (58) is mounted on the end of the transverse rod (52), and the extrusion plate (59) is mounted on the end of the end block (58); The lower mold assembly (8) comprises a bottom bar (81), an extrusion ring (82), a vertical rack (83), a guide column (84), a third gear (85), a first connecting shaft (86), a fourth gear (87), a fifth gear (88) and a second connecting shaft (89), wherein the guide column (84) is installed inside the base (1), the bottom bar (81) is fixed between the tops of the guide columns (84), the extrusion ring (82) is fitted on the surface of the bottom bar (81), and the vertical rack (83) is symmetrically installed on the bottom bar (81). The first connecting shaft (86) is installed inside the base (1), the third gear (85) is sleeved on the outer circumference of the first connecting shaft (86), and the third gear (85) is meshed with the vertical rack (83), the fourth gear (87) is sleeved on the end of the first connecting shaft (86), the second connecting shaft (89) passes through the inner circumference of the first gear (56), and the fifth gear (88) is sleeved on the end of the second connecting shaft (89), and the fifth gear (88) is meshed with the fourth gear (87).

2. The automobile swing arm sleeve connecting plate stamping equipment according to claim 1, characterized in that: A limiting block (55) is mounted on the surface of the limiting frame (51), and a side wall of the vertical rod (54) is provided with a limiting groove adapted to the limiting block (55).

3. The automobile swing arm sleeve connecting plate stamping equipment according to claim 2 is characterized in that: A connecting block (552) is installed on the side wall of the vertical rod (54), and a tension spring (551) is installed between the connecting block (552) and the limiting block (55).

4. The automobile swing arm sleeve connecting plate stamping equipment according to claim 3 is characterized in that: The surface of the base (1) is structured with a limiting slide groove (6), the limiting slide groove (6) is located on the side of the partition bar (2) away from the side thrust assembly (5), the bottom of the end block (58) is in contact with the limiting slide groove (6), the side wall of the partition bar (2) is structured with a limiting through groove (11), and the transverse rod (52) passes through the limiting through groove (11).

5. A stamping method, applicable to a stamping device for a connecting plate of an automobile swing arm sleeve as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1, placing the aluminum alloy blank after the drawing and trimming process in the stamping groove (14), and keeping the straight edge of the aluminum alloy blank in contact with the side wall of the partition bar (2); S2, the top seat (3) is driven downward by an external lifting device. During the bonding process between the top seat (3) and the base (1), the bonding block (13) first contacts the top of the vertical rod (54). The vertical rod (54) moves downward along the vertical groove (12). The vertical rod (54) controls the horizontal movement of the transverse rod (52) through the vertical tooth groove (541), the transverse rod (52), the horizontal tooth groove (521), the first gear (56) and the second gear (57). The transverse rod (52) pushes the aluminum alloy blank toward the arc-shaped edge of the stamping groove (14) through the end block (58) and the extrusion plate (59); S3, when the aluminum alloy blank is about to fit into the arc edge of the punching groove (14), the extrusion head (48) in the upper die assembly (4) is at the lowest point, and the extrusion head (48) with a wedge-shaped bottom first contacts the edge of the punching portion on the surface of the aluminum alloy blank, pierces the surface of the aluminum alloy blank from the inside of the punching portion, and continues to break the aluminum alloy blank during the subsequent movement of the aluminum alloy blank; S4. When the aluminum alloy blank is completely pressed against the arc edge of the punching groove (14), the bottom surface of the arc plate (46) contacts the surface of the aluminum alloy blank. At this time, the punch (47) extrude the aluminum alloy blank downward along the edge of the annular punching hole (7). The lower die assembly (8) slowly moves upward through the side push assembly (5), and the extrusion ring (82) extrude the aluminum alloy blank from below the aluminum alloy blank. Since the extrusion ring (82) is located on the inner side of the punch (47), it prevents the stamping part from deforming beyond the range when the aluminum alloy blank is stamped.

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