A punching die for square holes with different hole edge distances of the drive rear axle oil retaining disc and its process

Abstract

The present invention relates to a punching die for driving a rear axle oil baffle with different hole margins and a process thereof. The die comprises an upper die part and a lower die part. The upper die part comprises a die handle, an upper die plate, a guide sleeve, an upper pad, a punch fixing plate, a punch, a discharge rubber and a discharge plate; the lower die part comprises: an anti-error pin, a die pull plate, a die, a guide column, a movable rod, a limit spring, a limit plate, a die fixing plate, a positioning pin, a lower fixing plate, a lower die plate, a support seat, a guide sleeve, a positioning tooth, a positioning plate and a positioning plate pressure plate; the present invention adopts the rotation and positioning of structures such as movable rods, positioning teeth and positioning plates to drive the rotation and positioning of products, optimizes the traditional two-step punching process into a single-step punching process, improves production efficiency by 86%, and saves the die development fee of a set of processes. Or the traditional punching multi-hole process is to use a punching die with an inclined wedge structure for punching instead of using a punching die with a universal structure for punching, the die life is increased by 6 times, and the product quality is stable.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical equipment, and relates to a manufacturing die for an oil baffle, in particular to a die and process for punching square holes with different hole edge distances on a driving rear axle oil baffle. Background Art

[0002] The oil baffle is a disc-shaped part installed inside the brake hub of the driving rear axle of an automobile and closely attached to the bearing oil seal. Its main function is to prevent dust and foreign objects from entering the bearing oil seal, thereby protecting the normal operation of the bearing. The traditional production method of the oil baffle is processed in nine processes. The process flow is: blanking → blanking - punching → drawing 1 → drawing 2 → drawing 3 → trimming → punching → punching square hole 1 → punching square hole 2 to meet the product design requirements. Since the production batch of the oil baffle is large and the product square holes need to be punched in two times, and the hole edge distances of the two square holes are different, it is necessary to design two sets of punching square hole dies. In this way, it is necessary to install the die one more time and perform material distribution one more time, resulting in low production efficiency and long production time. Or, the punching of the square hole of the oil baffle is carried out by using a punching die with a wedge structure, so the die structure is complex and the die life is short (because the die is stressed unilaterally).

[0003] In addition, Chinese Patent No. CN205147106U with the publication number discloses a punching-trimming die for an automobile driving axle oil baffle, including an upper die and a lower die. The upper die includes a die shank, an upper template, an upper backing plate, an upper fixing plate, a connecting washer and a trimming female die; six bolt hole punches are uniformly arranged around the inside of the upper fixing plate, and one mounting hole punch is arranged in the middle. A cavity is arranged inside the trimming female die; the lower die includes a punching-trimming composite die, a lower backing plate and a lower template. The middle of the punching-trimming composite die is in a groove structure, and the inner cavity surface of the groove is consistent with the outer cavity surface of the oil baffle; an upper unloading mechanism is arranged between the trimming female die and the upper fixing plate; the trimming station is between the inner side of the cavity of the trimming female die and the outer side of the punching-trimming composite die, and the punching station is between the bolt hole punches and the punching holes of the punching-trimming composite die. Although this die has the punching function for the automobile driving axle oil baffle, it cannot process two square holes with different hole edge distances simultaneously;

[0004] Based on the consideration of the optimizability of the existing production process, the present invention designs a die for punching square holes with multiple different hole edge distances on the oil baffle, that is, converting the punching direction of the square hole of the oil baffle into the vertical direction and rotating the die positioning structure to drive the product to rotate, so that two square holes with different hole edge distances can be punched on the same die for the product, and the process of punching the square hole of the product is stable. Therefore, it is very necessary to design a die for punching square holes with multiple different hole edge distances on the driving rear axle oil baffle of an automobile to improve the production efficiency and product quality of the product. Summary of the Invention

[0005] The purpose of the present invention is to solve the defects of the prior art and provide a punching die for different hole margins of a driving rear axle oil baffle plate and a process thereof.

[0006] One of the purposes of the present invention is to provide a square hole die for punching multiple holes with different hole margins on the oil baffle plate of a rear axle of an automobile, which improves the die precision, production efficiency and product quality by using structures such as movable rods, positioning teeth and positioning plates to drive the product to rotate and position. The square hole die for punching multiple holes with different hole margins is installed on a press to punch multiple square holes on the oil baffle plate.

[0007] The second purpose of the present invention is to design a square hole die for punching multiple holes with different hole margins using the oil baffle plate, and use the same square hole punching die to punch two square holes with different hole margins on the oil baffle plate, so as to replace the traditional process of punching holes through two single-step dies or the process of punching holes using a square hole punching die with an inclined wedge structure.

[0008] The technical solution adopted to achieve one of the purposes of the present invention is as follows:

[0009] A punching die for punching square holes with different hole margins of a driving rear axle oil baffle plate comprises an upper die part and a lower die part, wherein the upper die part comprises a die handle, an upper die plate, a guide sleeve, an upper pad, a punch fixing plate, a punch, a discharge rubber and a discharge plate;

[0010] The lower die part of the mold includes: anti-error pin, die pull plate, die, guide column, movable rod, limit spring, limit plate, die fixing plate, positioning pin, lower fixing plate, lower template, support seat, guide sleeve, positioning teeth, positioning plate and positioning plate pressure plate;

[0011] The punch is installed in the fixed cavity of the punch fixing plate through interference fit, and the upper end surface is connected to the upper pad through bolts, the die handle is installed in the die handle hole of the upper template through interference fit, the guide sleeve is installed in the guide sleeve holes on both sides of the upper template through interference fit, the upper template and the upper pad are connected to the punch fixing plate through bolts and positioning pins, the unloading rubber is pre-compressed and installed on the punch, and the unloading plate is movably connected to the unloading rubber, the punch fixing plate, the upper pad, and the upper template through unloading bolts;

[0012] The female die is installed in the fixed cavity of the female die fixing plate through interference fit and is connected to the female die pull plate by bolts. The guide sleeve is installed in the guide sleeve hole of the support seat through interference fit. The female die fixing plate and the support seat are installed in the corresponding fixed cavities of the lower fixing plate through interference fit and are respectively connected to the lower template by bolts at their lower end faces. Four limit springs are pre-compressed and installed in the corresponding limit holes of the female die fixing plate. The limit plate is sleeved on the female die through clearance fit and is movably connected to the limit spring, the female die fixing plate, and the female die pull plate by a blanking bolt. The anti-misalignment pin is installed in the anti-misalignment pin hole of the movable rod through interference fit. Two positioning pins are installed in the respective positioning pin holes of the movable rod through interference fit. Two positioning teeth are installed on the front and rear surfaces of the support seat by bolts and positioning pins. The movable rod is sleeved in the guide sleeve hole of the guide sleeve through clearance fit. The positioning disk is installed on the fixed boss of the movable rod through interference fit and is connected to the positioning disk pressing plate by bolts. The guide posts are installed in the guide post holes on both sides of the lower template through interference fit. The lower template is connected to the lower fixing plate by bolts and positioning pins.

[0013] Further, the positioning disk is provided with a first "V"-shaped tooth and a second "V"-shaped tooth. The included angle of the "V"-shaped teeth is the included angle between two square holes of the product. The height difference between the first "V"-shaped tooth and the second "V"-shaped tooth is the difference in the hole edge distances from the two square holes of the product to the end face. The product is fixed on the movable rod, and the product is driven to rotate in the female die by rotating the positioning disk and the movable rod. The "V"-shaped teeth of the positioning teeth and the positioning disk are precisely positioned to ensure the included angle of each square hole and the hole edge distance of the square hole of the product, so as to punch out square holes with multiple different hole edge distances on the product.

[0014] Further, the movable rod and the guide sleeve are in clearance fit, and the double-sided clearance is 0.12 - 0.14 mm. The movable rod is provided with a guide hole, and the depth of the outer circle introduced to the right end face of the female die during blanking is 15 mm. The guide hole of the movable rod and the outer circle of the female die are in clearance fit, and the double-sided clearance is 0.16 - 0.18 mm.

[0015] Further, the limit plate and the outer circle of the female die are in clearance fit, and the double-sided clearance is 0.16 - 0.18 mm, ensuring the accuracy of the limit plate for limiting the end face of the product.

[0016] Further, the movable rod is provided with an anti-misalignment pin, and the anti-misalignment pin prevents the product from being mispositioned.

[0017] Further, the female die is made of die material Cr12MoV1, and the quenching hardness is HRC59 - 61.

[0018] Further, the double-sided clearance for punching the die is 0.11 - 0.13 mm, and the guide sleeve and the guide post are in clearance fit, and the double-sided clearance is 0.08 - 0.10 mm.

[0019] The technical solution adopted to achieve the second object of the present invention is as follows:

[0020] A process for punching square holes with different hole margins of a rear axle oil baffle plate includes the following steps:

[0021] Step 1: Rotate the square hole punching die with different hole margins of the rear drive axle oil baffle plate by 90° so that the back of the positioning plate faces the operator, making it convenient for the operator to rotate and hold the positioning plate, and install the die on the 63T press;

[0022] Step 2: Pull the movable rod backward by dragging the positioning plate with your hand. After completing the processes of blanking, blanking-punching, first drawing, second drawing, third drawing, trimming, and punching, place the prefabricated oil baffle plate on the positioning surface of the movable rod, and use positioning pins to fix the two inner holes of the product, and use anti-error pins to prevent errors;

[0023] Step 3: Use your hand to drag the positioning plate to push the movable rod forward, guide the inner hole of the product that has been positioned on the movable rod into the die, and make the two first "V"-shaped teeth on the positioning plate completely match the positioning teeth on both sides, then press the positioning plate with your hand to prevent the positioning plate from moving backward and affecting the hole margin of the product square hole. Under the pressure of the limit spring, the limit plate will make the end face of the product close to the positioning surface of the movable rod;

[0024] Step 4: Start the press, the upper template moves downward along with the worktable on the bed, the unloading plate first presses the product with the die under the pressure of the unloading rubber, and then as the punch continues to move downward, it completes the punching process of the first square hole of the product with the die;

[0025] Step 5: After the first square hole of the product is punched, the upper slide of the press drives the upper die part of the mold to return to its original position, and the unloading plate unloads the product under the force of the unloading rubber. The punching waste leaks out from the lower die and the lower workbench of the machine tool. Then, the positioning plate is pulled back a short distance by hand and rotated 45° counterclockwise. Then, the positioning plate is pushed forward to make the two second "V"-shaped teeth on the positioning plate completely match the positioning teeth on both sides, and then the positioning plate is pressed by hand. That is, after the positioning plate rotates from the first "V"-shaped tooth to the second "V"-shaped tooth, the positioning plate rotates 45°, and the positioning plate drives the movable rod to rotate 45°, and the movable rod drives the product to rotate 45° on the die. The first "V"-shaped tooth and the second "V"-shaped tooth on the positioning plate have different tooth depths, so the hole margins of the two punched square holes are also different, and the limit plate presses the end face of the product against the positioning surface of the movable rod under the pressure of the limit spring;

[0026] Step 6: Start the press, the upper template moves downward along with the worktable on the bed, the unloading plate first presses the product with the die under the pressure of the unloading rubber, and then as the punch continues to move downward, it completes the punching process of the second square hole of the product with the die;

[0027] Step 7: After the punching process of the second square hole of the product, the upper slider of the press drives the upper part of the mold to return. Then, hold the positioning plate by hand and pull the movable rod backward, that is, the inner hole of the product should be separated from the female mold, and take out the product with both square holes punched and place it in the material box. The punching waste leaks out from the lower die and the lower workbench of the machine tool. In this way, the product completes the punching of square holes with two different hole margins;

[0028] Step 8: Repeat the operations in Step 2 to Step 7 to manufacture the next product.

[0029] The beneficial effects of the present invention are as follows: After using this mold, the relevant dimensions of each square hole of the drive axle oil baffle are within the tolerance range, which can continuously and stably ensure that the drive axle oil baffle of the automobile meets the design requirements of the product drawing. And the traditional two-step square hole punching process is optimized to a one-step square hole punching process, the production efficiency is increased by 86%, and the mold development cost of one set of process is saved. The traditional punching process for multiple holes is changed from using a punching die with a swivel wedge structure to using a punching die with a general structure. The mold uses structures such as a movable rod, positioning teeth, and a positioning plate to rotate and position to drive the rotation and positioning of the product, thereby increasing the mold life by 6 times, reducing production costs, and ensuring stable workpiece quality. Description of the Drawings

[0030] Figure 1 is the front view structural schematic diagram of the mold in the embodiment of the present invention;

[0031] Figure 2 is the top view structural schematic diagram of the lower die part in the embodiment of the present invention;

[0032] Figure 3 is the structural schematic diagram of the female mold of the mold in the embodiment of the present invention;

[0033] Figure 4 is the structural schematic diagram of the movable rod of the mold in the embodiment of the present invention;

[0034] Figure 5 is the side view schematic diagram of the movable rod of the mold in the embodiment of the present invention;

[0035] Figure 6 is the structural schematic diagram of the positioning teeth of the mold in the embodiment of the present invention.

[0036] Figure 7 is the structural schematic diagram of the positioning plate of the mold in the embodiment of the present invention.

[0037] Figure 8 is the structural schematic diagram of the processed oil baffle in the embodiment of the present invention.

[0038] In the figure: shank 1, upper template 2, guide bushing 3, upper backing plate 4, punch holder 5, punch 6, stripping rubber 7, stripper plate 8, anti-misalignment pin 9, die pull plate 10, die 11, guide pillar 12, movable rod 13, limit spring 14, limit plate 15, die holder 16, locating pin 17, lower holder 18, lower template 19, support seat 20, guide sleeve 21, locating tooth 22, locating disc 23, locating disc pressing plate 24, first "V"-shaped tooth 231, second "V"-shaped tooth 232, anti-misalignment pin hole 131, locating pin hole 132, guide hole 133. Detailed implementation

[0039] The present invention can be specifically implemented through the technical solution. The present invention can be further described through the following embodiments. However, the scope of the present invention is not limited to the following embodiments.

[0040] As Figures 1 to 8 shown, a punching die for square holes with different hole edge distances of a driving rear axle oil baffle includes an upper die part and a lower die part. The upper die part includes a shank 1, an upper template 2, a guide bushing 3, an upper backing plate 4, a punch holder 5, a punch 6, a stripping rubber 7 and a stripper plate 8;

[0041] The lower die part of the die includes: an anti-misalignment pin 9, a die pull plate 10, a die 11, a guide pillar 12, a movable rod 13, a limit spring 14, a limit plate 15, a die holder 16, a locating pin 17, a lower holder 18, a lower template 19, a support seat 20, a guide sleeve 21, a locating tooth 22, a locating disc 23 and a locating disc pressing plate 24;

[0042] The punch 6 is installed in the fixed cavity of the punch holder 5 by interference fit, and the upper end surface is connected to the upper backing plate 4 by bolts. The shank 1 is installed in the shank hole of the upper template 2 by interference fit. The guide bushing 3 is installed in the guide bushing holes on both sides of the upper template 2 by interference fit. The upper template 2 and the upper backing plate 4 are connected to the punch holder 5 by bolts and locating pins. The stripping rubber 7 is pre-compressed and installed on the punch 6. The stripper plate 8 is movably connected to the stripping rubber 7, the punch holder 5, the upper backing plate 4 and the upper template 2 by stripping bolts;

[0043] The female die 11 is installed in the fixed cavity of the female die fixing plate 16 through interference fit and is connected to the female die pulling plate 10 by bolts. The guide sleeve 21 is installed in the guide sleeve hole of the support seat 20 through interference fit. The female die fixing plate 16 and the support seat 20 are installed in the corresponding fixed cavities of the lower fixing plate 18 through interference fit, and their lower end faces are respectively connected to the lower template 19 by bolts. Four limit springs 14 are pre-compressed and installed in the corresponding limit holes of the female die fixing plate 16. The limit plate 15 is sleeved on the female die 11 through clearance fit and is movably connected to the limit spring 14, the female die fixing plate 16, and the female die pulling plate 10 by unloading bolts. The anti-misalignment pin 9 is installed in the anti-misalignment pin hole 131 of the movable rod 13 through interference fit. Two positioning pins 17 are installed in the respective positioning pin holes 132 of the movable rod 13 through interference fit. Two positioning teeth 22 are installed on the front and rear surfaces of the support seat 20 by bolts and positioning pins. The movable rod 13 is sleeved in the guide sleeve hole of the guide sleeve 21 through clearance fit. The positioning disk 23 is installed on the fixed boss of the movable rod 13 through interference fit and is connected to the positioning disk pressing plate 24 by bolts. The guide posts 12 are installed in the guide post holes on both sides of the lower template 19 through interference fit. The lower template 19 is connected to the lower fixing plate 18 by bolts and positioning pins.

[0044] Further, the positioning disk 23 is provided with a first "V"-shaped tooth 231 and a second "V"-shaped tooth 232. The included angle of the "V"-shaped teeth is the included angle between two square holes of the product. The height difference between the first "V"-shaped tooth 231 and the second "V"-shaped tooth 232 is the difference in the hole edge distances from the two square holes of the product to the end face. The product is fixed on the movable rod 13, and by rotating the positioning disk 23 and the movable rod 13, the product is driven to rotate in the female die 11. The positioning teeth 22 and the "V"-shaped teeth of the positioning disk 23 are accurately positioned to ensure the included angle and the hole edge distances of the square holes of the product, so as to punch out square holes with different hole edge distances on the product.

[0045] Among them, the movable rod 13 and the guide sleeve 21 have a clearance fit, and the double-sided clearance is 0.12 - 0.14 mm. The movable rod 13 is provided with a guide hole 133, and the depth of the outer circle introduced into the right end face of the female die 11 during blanking is 15 mm. The guide hole 133 of the movable rod 13 and the outer circle of the female die 11 have a clearance fit, and the double-sided clearance is 0.16 - 0.18 mm. This not only ensures the rotation accuracy of the movable rod 13, thus ensuring the positioning accuracy of the product, but also the guide hole of the movable rod 13 plays a role in supporting the female die 11 during the blanking process, thereby improving the strength and the die life of the female die 11.

[0046] The limit plate 15 and the outer circle of the female die 11 have a clearance fit, and the double-sided clearance is 0.16 - 0.18 mm, ensuring the accuracy of the limit plate 15 in limiting the end face of the product. In this way, the accuracy of the limit plate 15 in limiting the end face of the product (even if the end face of the product is closely attached to the positioning surface of the movable rod 13) is ensured, thereby improving the quality.

[0047] In addition, the movable rod 13 is provided with an anti-error pin 9, which prevents the product from being misplaced. The die 11 is made of Cr12MoV1, and the quenching hardness is HRC59-61, so as to improve the strength of the die 11 and thus improve the life of the die.

[0048] The double-sided clearance of the die punching is 0.11-0.13 mm, the guide sleeve 3 and the guide column 12 are matched with each other, and the double-sided clearance is 0.08-0.10 mm.

[0049] Furthermore, a process for punching square holes with different hole margins of a rear axle oil baffle plate includes the following steps:

[0050] Step 1: Rotate the square hole punching die with different hole margins of the rear drive axle oil baffle plate by 90° so that the reverse side of the positioning plate 23 faces the operator, making it convenient for the operator to rotate and hold the positioning plate 23, and install the die on the 63T press machine at the same time;

[0051] Step 2: Pull the movable rod 13 backward by dragging the positioning plate 23 by hand, and place the prefabricated oil baffle plate after completing the processes of blanking, blanking-punching, first drawing, second drawing, third drawing, trimming, and punching on the positioning surface of the movable rod 13, and use the positioning pin 17 to fix the two inner holes of the product, and use the anti-error pin 9 to prevent errors;

[0052] Step 3: Use your hand to drag the positioning plate 23 to push the movable rod 13 forward, guide the inner hole of the product that has been positioned on the movable rod 13 into the die 11, and make the two first "V"-shaped teeth 231 on the positioning plate 23 completely match the positioning teeth 22 on both sides, then press the positioning plate 23 by hand to prevent the positioning plate 23 from moving backward and affecting the hole margin of the product square hole. The limiting plate 15, under the pressure of the limiting spring 14, makes the end face of the product close to the positioning surface of the movable rod 13;

[0053] Step 4: Start the press, the upper template 2 moves downward with the workbench on the bed, the unloading plate 8 first presses the product with the die 11 under the pressure of the unloading rubber 7, and then as the punch 6 continues to move downward, it completes the punching process of the first square hole of the product with the die 11;

[0054] Step 5: After the punching of the first square hole of the product, the upper slider of the press drives the upper die part of the die to return. The stripper plate 8 ejects the product under the action of the stripping rubber 7. The punching waste leaks out from the lower die and the lower workbench of the machine tool. Then, drag the positioning plate 23 backward by hand for a short distance and rotate it counterclockwise by 45°. Then, push the positioning plate 23 forward so that the two second "V"-shaped teeth 232 on the positioning plate 23 are completely aligned with the positioning teeth 22 on both sides. Then, hold the positioning plate 23 by hand. That is, after the positioning plate 23 rotates from the first "V"-shaped tooth 231 to the second "V"-shaped tooth 232, the positioning plate 23 rotates 45°. The positioning plate 23 drives the movable rod 13 to rotate 45°. The movable rod 13 drives the product to rotate 45° on the female die 11. Since the depths of the first "V"-shaped tooth 231 and the second "V"-shaped tooth 232 on the positioning plate 23 are different, the hole edge distances of the two punched square holes are also different. The limiting plate 15 presses the end face of the product tightly against the positioning surface of the movable rod 13 under the pressure of the limiting spring 14;

[0055] Step 6: Start the press. The upper template 2 moves downward along with the lower workbench of the machine tool. The stripper plate 8 first presses the product tightly against the female die 11 under the pressure of the stripping rubber 7, and then completes the punching of the second square hole of the product with the punch 6 as it continues to move downward with the female die 11;

[0056] Step 7: After the punching of the second square hole of the product, the upper slider of the press drives the upper half of the die to return. Then, drag the positioning plate 23 backward by hand to pull the movable rod 13 backward, that is, the inner hole of the product needs to be separated from the female die 11. Take out the product with both square holes punched and place it in the material box. The punching waste leaks out from the lower die and the lower workbench of the machine tool. In this way, the product completes the punching of two square holes with different hole edge distances;

[0057] Step 8: Repeat the operations in Step 2 to Step 7 to manufacture the next product.

[0058] After using this die, all the relevant dimensions of the square holes of the oil baffle of the automotive drive rear axle are within the tolerance range, which can continuously and stably ensure that the oil baffle of the automotive drive rear axle meets the requirements of the product drawing design. The traditional two-step square hole punching process is optimized to a one-step square hole punching process, and the production efficiency is increased by 86%, and the mold development cost of one set of process is saved. Or the traditional punching process for multiple holes is changed from using a punching die with a wedge structure to using a punching die with a general structure. The die uses structures such as a movable rod, positioning teeth, and a positioning plate to rotate and position to drive the rotation and positioning of the product, thereby increasing the die life by 6 times, reducing the production cost, and ensuring the stability of the workpiece quality.

[0059] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A die for punching square holes with different hole margins for a rear axle oil baffle, comprising an upper die portion and a lower die portion, wherein the upper die portion comprises a die handle (1), an upper die plate (2), a guide sleeve (3), an upper pad (4), a punch fixing plate (5), a punch (6), a discharge rubber (7) and a discharge plate (8); The lower die part of the mold includes: Anti-error pin (9), die pull plate (10), die (11), guide column (12), movable rod (13), limit spring (14), limit plate (15), die fixing plate (16), positioning pin (17), lower fixing plate (18), lower template (19), support seat (20), guide sleeve (21), positioning teeth (22), positioning plate (23) and positioning plate pressure plate (24); The invention is characterized in that the punch (6) is installed in the fixed cavity of the punch fixing plate (5) by interference fit, and the upper end surface is connected to the upper pad (4) by bolts, the die handle (1) is installed in the die handle hole of the upper template (2) by interference fit, the guide sleeve (3) is installed in the guide sleeve holes on both sides of the upper template (2) by interference fit, the upper template (2) and the upper pad (4) are connected to the punch fixing plate (5) by bolts and positioning pins, the unloading rubber (7) is pre-compressed and installed on the punch (6), and the unloading plate (8) is movably connected to the unloading rubber (7), the punch fixing plate (5), the upper pad (4) and the upper template (2) by unloading bolts; The die (11) is installed in the fixed cavity of the die fixing plate (16) by interference fit, and is connected to the die pull plate (10) by bolts. The guide sleeve (21) is installed in the guide sleeve hole of the support seat (20) by interference fit. The die fixing plate (16) and the support seat (20) are installed in the corresponding fixed cavities of the lower fixing plate (18) by interference fit, and the lower end surfaces are connected to the lower template (19) by bolts. Four limit springs (14) are pre-compressed and installed in the corresponding limit holes of the die fixing plate (16). The limit plate (15) is sleeved on the die (11) by clearance fit, and is movably connected to the limit spring (14), the die fixing plate (16), and the die pull plate (10) by unloading bolts. The anti-error pin (9) is installed on the movable rod by interference fit. (13), two positioning pins (17) are installed in the positioning pin holes of the movable rod (13) through interference fit, two positioning teeth (22) are installed on the front and rear surfaces of the support seat (20) through bolts and positioning pins, the movable rod (13) is sleeved in the guide sleeve hole of the guide sleeve (21) through clearance fit, the positioning plate (23) is installed on the fixed boss of the movable rod (13) through interference fit, and is connected to the positioning plate pressure plate (24) through bolts, the guide column (12) is installed in the guide column holes on both sides of the lower template (19) through interference fit, and the lower template (19) is connected to the lower fixed plate (18) through bolts and positioning pins; The die (11) is made of mold material Cr12MoV1, and the quenching hardness is HRC59 to 61; The double-sided clearance of the die punching is 0.11-0.13 mm, and the clearance between the guide sleeve (3) and the guide column (12) is matched, and the double-sided clearance is 0.08-0.10 mm.

2. The punching die for square holes with different hole edge distances of the drive rear axle oil baffle according to claim 1, wherein The positioning plate (23) is provided with a first "V"-shaped tooth (231) and a second "V"-shaped tooth (232); the included angle of the "V"-shaped teeth is the included angle between the two square holes of the product; the height difference between the first "V"-shaped tooth (231) and the second "V"-shaped tooth (232) is the difference in hole margins between the two square holes of the product and the end surface; the product is fixed on the movable rod (13); the positioning plate (23) and the movable rod (13) are rotated to drive the product to rotate in the die (11); the positioning teeth (22) and the "V"-shaped teeth of the positioning plate (23) are accurately positioned to ensure the included angle and hole margin of the square holes of the product, thereby punching out a plurality of square holes with different hole margins on the product.

3. The punching die for square holes with different hole edge distances of the drive rear axle oil baffle according to claim 2, characterized in that, The movable rod (13) and the guide sleeve (21) are clearance matched, and the double-sided clearance is 0.12-0.14 mm. A guide hole is provided on the movable rod (13). The outer circle depth of the guide hole introduced into the right end surface of the die (11) during punching is 15 mm. The guide hole of the movable rod (13) and the outer circle clearance of the die (11) are clearance matched, and the double-sided clearance is 0.16-0.18 mm.

4. A die for punching square holes with different hole edge distances of the oil baffle of a driving rear axle, according to claim 2 or 3, characterized in that The limiting plate (15) and the outer circle of the die (11) are matched with each other in clearance, and the double-sided clearance is 0.16-0.18 mm, thereby ensuring the accuracy of the limiting plate (15) in limiting the end surface of the product.

5. The punching die for square holes with different hole edge distances of the driving rear axle oil retaining plate according to claim 4, characterized in that, The movable rod (13) is provided with an anti-error pin (9), which prevents the product from being positioned incorrectly.

6. A process for punching square holes with different hole edge distances on the oil baffle of the driving rear axle, characterized in that, The steps include: Step 1: Rotate the square hole punching die with different hole margins of the rear drive axle oil baffle plate by 90° so that the reverse side of the positioning plate (23) faces the operator, making it easier for the operator to rotate and hold the positioning plate (23), and install the die on the 63T press machine; Step 2: Pull the movable rod (13) backward by dragging the positioning plate (23) by hand, and place the prefabricated oil baffle plate after completing the blanking, blanking-punching, first drawing, second drawing, third drawing, trimming, and punching processes on the positioning surface of the movable rod (13), and use the positioning pin (17) to fix the two inner holes of the product, and use the anti-error pin (9) to prevent errors; Step 3: Use your hand to drag the positioning plate (23) to push the movable rod (13) forward, guide the inner hole of the product that has been positioned on the movable rod (13) into the die (11), and make the two first "V"-shaped teeth (231) on the positioning plate (23) completely match the positioning teeth (22) on both sides, then press the positioning plate (23) with your hand to prevent the positioning plate (23) from moving backward and affecting the hole margin of the product square hole. Under the pressure of the limit spring (14), the limit plate (15) makes the end face of the product close to the positioning surface of the movable rod (13); Step 4: Start the press machine, the upper platen (2) moves downward along with the worktable on the bed, the unloading plate (8) first presses the product with the die (11) under the pressure of the unloading rubber (7), and then the punch (6) continues to move downward to complete the punching process of the first square hole of the product with the die (11); Step 5: After the punching of the first square hole of the product, the upper slider of the press drives the upper die part of the mold to return. The stripper plate (8) ejects the product under the action of the stripping rubber (7). The punching waste leaks out from the lower die and the lower workbench of the machine tool. Then, drag the positioning disc (23) backward by hand for a short distance and rotate it counterclockwise by 45°. Then, push the positioning disc (23) forward so that the two second "V"-shaped teeth (232) on the positioning disc (23) are completely aligned with the positioning teeth (22) on both sides. Then, hold the positioning disc (23) by hand. That is, after the positioning disc (23) rotates from the first "V"-shaped tooth (231) to the second "V"-shaped tooth (232), the positioning disc (23) rotates 45°. The positioning disc (23) drives the movable rod (13) to rotate 45°. The movable rod (13) drives the product to rotate 45° on the female die (11). Since the depths of the first "V"-shaped tooth (231) and the second "V"-shaped tooth (232) on the positioning disc (23) are different, the hole edge distances of the two punched square holes are also different. The limiting plate (15) presses the end face of the product tightly against the positioning surface of the movable rod (13) under the pressure of the limiting spring (14). Step 6: Start the press. The upper template (2) moves downward with the lower workbench of the machine tool. The stripper plate (8) first presses the product tightly against the female die (11) under the pressure of the stripping rubber (7). Then, as the punch (6) continues to move downward, the second square hole of the product is punched with the female die (11). Step 7: After the punching of the second square hole of the product, the upper slider of the press drives the upper half of the mold to return. Then, drag the positioning disc (23) backward by hand to pull the movable rod (13) backward, that is, the inner hole of the product is to be separated from the female die (11). Take out the product with both square holes punched and place it in the material box. The punching waste leaks out from the lower die and the lower workbench of the machine tool. In this way, the product completes the punching of two square holes with different hole edge distances. Step 8: Repeat the operations in Step 2 to Step 7 to manufacture the next product.

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