Automobile fender forming device and use method

Abstract

The present invention discloses a car fender forming device and a method for using the same. The device comprises: an upper mold, a lower mold, two bearing plates, and a driving mechanism installed on a workbench. The top of the upper mold and the bottom of the lower mold are fixedly connected with a convex slider. A concave slot is provided on the side of the bearing plate. The convex slider is slidably inserted in the concave slot. A locking mechanism for locking the convex slider is provided inside the bearing plate. The convex slider provided on the upper mold and the lower mold cooperates with the concave slot provided on the bearing plate. When the upper mold and the lower mold are installed, it is only necessary to slide the convex slider into the concave slot, and then fix the convex slider in the concave slot through the locking mechanism to complete the fixing of the mold. When disassembling, it is only necessary to unlock the locking mechanism to remove the mold from the bearing plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile fender molding, and in particular relates to an automobile fender molding device and a use method thereof. Background Art

[0002] Car fenders are used to prevent mud, gravel or water from being blown onto the vehicle body when the vehicle is driving; especially for large trucks, which often drive on harsh mountain roads and mud roads, fenders are even more important.

[0003] The patent document with application number CN202121062681.6 discloses a fender stamping device, including a placing plate, on which a stamping structure and a clamping structure are provided; wherein the stamping structure includes: four support columns, a support plate, four guide rods, a hydraulic cylinder, a movable plate, an upper mold, a lower mold and a number of springs; the four support columns are installed at the four corners of the upper wall of the placing plate, the support plate is installed on the upper wall of the four support columns, the bottom ends of the four guide rods are installed on the wall of the placing plate, the top ends of the four guide rods are installed on the lower wall of the support plate, the four guide rods are located in the middle of the four support columns, and the bottom end of the hydraulic cylinder is installed on the lower wall of the support plate, which solves the problem of easy stamping deviation or inconvenience in picking up after stamping when stamping the fender.

[0004] However, when the above-mentioned fender stamping equipment is in use, it is inconvenient to disassemble and replace the upper mold and the lower mold. Summary of the Invention

[0005] In view of the problem in the prior art that it is inconvenient to disassemble and replace the upper mold and the lower mold, the present invention provides an automobile fender forming device and a method for using the device, which can quickly disassemble and assemble the upper mold and the lower mold.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0007] An automobile fender forming device, comprising:

[0008] An upper mold and a lower mold, wherein the top of the upper mold and the bottom of the lower mold are fixedly connected with a convex slider;

[0009] Two carrying plates are provided, one of which is fixed to the top of the workbench, and the other is fixed to the bottom of the driving mechanism and arranged above the workbench. A concave groove is provided on the side of the carrying plate, and the convex slider is slidably inserted into the inside of the concave groove. A locking mechanism for locking the convex slider is provided inside the carrying plate;

[0010] The upper mold is arranged on the bottom of the carrying plate connected to the driving mechanism, and the lower mold is arranged on the top of the carrying plate connected to the workbench;

[0011] The upper mold is located directly above the lower mold, and the driving mechanism is used to drive the upper mold to move up and down.

[0012] An automobile fender forming device adopting the above technical solution is composed of a driving mechanism, a workbench, an upper mold, a lower mold, a carrying plate and a locking mechanism arranged in the carrying plate. The convex sliders arranged on the upper mold and the lower mold cooperate with the concave slide grooves opened on the carrying plate. When the upper mold and the lower mold are installed, it is only necessary to slide the convex slider into the concave slide groove, and then fix the convex slider in the concave slide groove through the locking mechanism to complete the fixation of the mold. The operation is simple. When disassembling, it is only necessary to unlock the locking mechanism to remove the mold from the carrying plate.

[0013] Furthermore, the locking mechanism includes a worm wheel and a worm, a first assembly groove connected to one side of the concave slide groove is opened inside the supporting plate, the worm wheel and the worm are both rotatably arranged inside the first assembly groove, a rack is fixedly connected to one side of the convex slider, the worm wheel is meshed with the rack, the worm is meshed with the worm wheel, and an anti-rotation component is provided at one end of the worm.

[0014] Furthermore, the anti-rotation component includes a movable rod, a limiting toothed disc and an inner gear ring. A slot connected to the inside of the first assembly slot is opened on one side of the supporting plate, and an inner cavity is opened at one end of the worm. The movable rod is slidably inserted into the inside of the slot, and one end of the movable rod is slidably inserted into the inside of the inner cavity. A limiting groove is opened on the inner wall of the inner cavity, and the end of the movable rod close to the worm is fixedly connected to a limiting block, and the limiting block is slidably arranged inside the limiting groove. The inner gear ring is fixedly connected to the inside of the end of the slot away from the worm, the limiting toothed disc is fixedly connected to the end of the movable rod away from the worm, and the tooth head of the limiting toothed disc is inserted in the tooth groove of the inner gear ring.

[0015] Furthermore, a spring is provided inside the inner cavity, one end of the spring presses on one end of the movable rod, and the other end of the spring presses on the inner wall of one end of the inner cavity.

[0016] Furthermore, the surface of the movable rod is fixedly connected to one end of the elastic clamp, and an annular groove connected to the slot is opened inside the supporting plate, and the elastic clamp is slidably clamped inside the annular groove at one end away from the movable rod.

[0017] Furthermore, an operating hole communicating with the annular groove is provided on the surface of the supporting plate.

[0018] Furthermore, a second assembly groove is opened inside the supporting plate, and the interior of the second assembly groove is rotatably connected to a limit gear. The side of the convex slider away from the worm gear is also fixedly connected to the rack, and the limit gear is engaged with the rack on the side of the convex slider away from the worm gear.

[0019] Furthermore, a circular operating hole is provided at the bottom of the workbench and is connected to an operating hole on a supporting plate fixed on the top of the workbench.

[0020] Furthermore, the driving mechanism includes a hydraulic cylinder and a top plate, the four corners of the bottom of the top plate are fixedly connected to guide columns, the bottom of the guide columns is fixedly connected to the top of the workbench, the supporting plate connected to the upper mold is slidably mounted on the guide columns through a sliding sleeve, the hydraulic cylinder is fixed to the top of the top plate, and the bottom of the piston rod of the hydraulic cylinder slides through the top plate and is fixedly connected to the top of the supporting plate connected to the upper mold.

[0021] Furthermore, an inner hexagonal slot is formed at one end of the movable rod away from the worm.

[0022] The present invention also provides a method for using the automobile fender forming device, and the method for using the device is as follows:

[0023] S1. When installing the upper mold, insert the convex slider on the upper mold into the concave slide groove on the carrying plate;

[0024] S2. When the rack on the side of the convex slider touches the worm gear, the movable rod is pressed toward the worm gear, and the limiting toothed disc is squeezed out of the inner gear ring, completing the unlocking of the movable rod. At this time, the spring is in a compressed state.

[0025] S3. Continue to press the movable rod toward the worm gear. When you hear a click, the end of the elastic clamp away from the movable rod is inserted into the annular groove. The spring is now in a compressed state. This operation prevents the movable rod from rotating and inserting the limit gear disc into the inner gear ring again under the elastic force of the spring.

[0026] S4, rotating the movable rod clockwise, thereby driving the worm to rotate clockwise, and then the worm wheel drives the rack to move toward the inside of the convex slider;

[0027] S5. When the convex slider is fully inserted into the concave slide groove, use a cross pick or other rod-shaped object to insert into the operating hole, and clamp the end of the elastic clamp into the annular groove to squeeze it out of the annular groove. At this time, the movable rod moves away from the worm gear under the elastic force of the spring, and then the limit gear disc is inserted into the inner gear ring again, thus completing the installation of the upper mold;

[0028] S6, repeat the above steps S1-S5 to complete the installation of the lower mold;

[0029] S7, placing the fender blank to be stamped into the lower mold, and then controlling the piston rod of the hydraulic cylinder to extend, thereby closing the upper mold and the lower mold to stamp the fender blank;

[0030] S8. Control the piston rod of the hydraulic cylinder to retract, thereby separating the upper mold from the lower mold, and then take the stamped fender out of the lower mold.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention cooperates with the concave slide groove provided on the carrying plate by convex sliders provided on the upper mold and the lower mold. When the upper mold and the lower mold are installed, it is only necessary to slide the convex slider into the concave slide groove, and then fix the convex slider in the concave slide groove through the locking mechanism to complete the fixation of the mold. When disassembling, it is only necessary to unlock the locking mechanism to remove the mold from the carrying plate, and the fixing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the automobile fender forming device of the present invention;

[0034] Figure 2 A schematic structural diagram of the automobile fender forming device of the present invention from another perspective;

[0035] Figure 3 It is a schematic diagram of the exploded structure of the supporting plate and the upper mold of the automobile fender forming device of the present invention;

[0036] Figure 4 This is a schematic diagram of the cross-sectional structure of the support plate of the automobile fender forming device of the present invention;

[0037] Figure 5 This is a second schematic cross-sectional view of the supporting plate of the automobile fender forming device of the present invention;

[0038] Figure 6 This is a third schematic cross-sectional structural diagram of the support plate of the automobile fender forming device of the present invention;

[0039] Figure 7 for Figure 3 A schematic diagram of the enlarged structure of part A in FIG;

[0040] Figure 8 for Figure 5 Schematic diagram of the enlarged structure of part B;

[0041] Figure 9 for Figure 6 Schematic diagram of the enlarged structure of part C in.

[0042] Explanation of the marks in the figure: 1. Workbench; 2. Hydraulic cylinder; 3. Top plate; 4. Load-bearing plate; 5. Upper mold; 6. Lower mold; 7. Guide column; 8. Operating circular hole; 9. Convex slider; 10. Worm gear; 11. Worm; 12. First assembly groove; 13. Limit gear; 14. Second assembly groove; 15. Rack; 16. Concave slide; 17. Movable rod; 18. Spring; 19. Limit groove; 20. Limit block; 21. Slot; 22. Limit gear disc; 23. Inner gear ring; 24. Annular groove; 25. Elastic clamp; 26. Operating hole; 27. Hexagonal groove; 28. Inner cavity. DETAILED DESCRIPTION

[0043] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0044] like Figure 1-9 As shown, this embodiment provides an automobile fender forming device, including an upper mold 5, a lower mold 6 and two supporting plates 4, wherein the top of the upper mold 5 and the bottom of the lower mold 6 are fixedly connected with a convex slider 9, one of the supporting plates 4 is fixed to the top of the workbench 1, and the other supporting plate 4 is fixed to the bottom of the driving mechanism and is arranged above the workbench 1, and a concave groove 16 is provided on the side of the supporting plate 4, and the convex slider 9 is slidably inserted into the inside of the concave groove 16, and a locking mechanism for locking the convex slider 9 is provided inside the supporting plate 4.

[0045] The upper mold 5 is arranged on the bottom of the carrying plate 4 connected to the driving mechanism, and the lower mold 6 is arranged on the top of the carrying plate 4 connected to the workbench 1.

[0046] The upper mold 5 is located directly above the lower mold 6 , and the driving mechanism is used to drive the upper mold 5 to move up and down.

[0047] Specifically, the driving mechanism for driving the upper mold 5 to move up and down includes a hydraulic cylinder 2 and a top plate 3. The four corners of the bottom of the top plate 3 are fixedly connected to guide columns 7. The bottom of the guide columns 7 is fixedly connected to the top of the workbench 1. The supporting plate 4 connected to the upper mold 5 is slidably mounted on the guide columns 7 through a sliding sleeve. The hydraulic cylinder 2 is fixed on the top of the top plate 3. The bottom of the piston rod of the hydraulic cylinder 2 slides through the top plate 3 and is fixedly connected to the top of the supporting plate 4 connected to the upper mold 5. Through the above technical solution, when the fender blank is stamped, the fender blank to be stamped is placed in the lower mold 6, and then the piston rod of the hydraulic cylinder 2 is controlled to extend, so that the upper mold 5 and the lower mold 6 are closed to stamp the fender blank. After forming, the piston rod of the hydraulic cylinder 2 is controlled to retract, so that the upper mold 5 and the lower mold 6 are separated, and then the stamped fender can be taken out from the lower mold 6.

[0048] The worm gear 10 and the worm gear 11 are both rotatably arranged in the first assembly groove 12, and a rack 15 is fixedly connected to one side of the convex slider 9. The worm gear 10 is meshed with the rack 15, and the worm gear 11 is meshed with the worm gear 10. Through the above technical solution, when the mold is installed, the convex slider 9 on the upper mold 5 is inserted into the concave groove 16 on the carrying plate 4. When the rack 15 on the side of the convex slider 9 touches the worm gear 10, the worm gear 11 is rotated, thereby causing the worm gear 10 to rotate. Because the worm gear 10 is meshed with the rack 15, the worm gear 10 drives the rack 15 to move toward the inside of the convex slider 9. By providing a worm gear 10 and worm gear 11 with a self-locking function and cooperating with the rack 15, the convex slider 9 can be fixed in the concave groove 16.

[0049] Specifically, the worm 11 is meshed with the worm wheel 10, and an anti-rotation component is provided at one end of the worm 11, and the anti-rotation component includes a movable rod 17, a limiting toothed disc 22 and an inner gear ring 23. A slot 21 connected to the inside of the first assembly groove 12 is provided on one side of the carrying plate 4, and an inner cavity 28 is provided at one end of the worm 11. The movable rod 17 is slidably inserted into the inside of the slot 21, and one end of the movable rod 17 is slidably inserted into the inside of the inner cavity 28. A limiting groove 19 is provided on the inner wall of the inner cavity 28, and the end of the movable rod 17 close to the worm 11 is fixedly connected to the limiting block 20, and the limiting block 20 is slidably set in the limiting groove 19. The inner gear ring 23 is fixedly connected to the inside of the end of the slot 21 away from the worm 11, and the limiting toothed disc 22 is fixedly connected to the inner cavity 28. The movable rod 17 is away from one end of the worm 11, and the tooth head of the limiting toothed disc 22 is inserted into the tooth groove of the inner gear ring 23. The movable rod 17 is set to cooperate with the limiting toothed disc 22 and the inner gear ring 23. When there is no need to rotate the worm 11, it is only necessary to insert the limiting toothed disc 22 into the inner gear ring 23, and then the movable rod 17 can be limited, effectively preventing the movable rod 17 from rotating under external vibration. Because one end of the movable rod 17 is inserted into the limiting groove 19 in the inner cavity 28 of the worm 11 through the limiting block 20, it can effectively prevent the worm 11 from rotating, thereby improving the stability of the self-locking mechanism. When the worm 11 needs to be rotated, it is only necessary to press the limiting toothed disc 22 out of the inner gear ring 23, and then rotate the movable rod 17.

[0050] Specifically, an inner hexagonal slot 27 is formed at one end of the movable rod 17 away from the worm 11 , and the movable rod 17 can be rotated by using an inner hexagonal screwdriver.

[0051] Specifically, a spring 18 is provided inside the inner cavity 28, one end of the spring 18 is pressed on one end of the movable rod 17, and the other end of the spring 18 is pressed on the inner wall of one end of the inner cavity 28. The provision of the spring 18 can effectively prevent the movable rod 17 from moving inside the slot 21.

[0052] Specifically, the surface of the movable rod 17 is fixedly connected to one end of the elastic clamp 25, and an annular groove 24 connected to the slot 21 is opened inside the supporting plate 4. The elastic clamp 25 slides and is clamped in the annular groove 24 at one end away from the movable rod 17. Through the above technical solution, the elastic clamp 25 is set, and the elastic clamp 25 can be clamped into the annular groove 24 when the movable rod 17 is rotated, so as to prevent the movable rod 17 from inserting the limiting toothed disc 22 into the inner gear ring 23 again under the elastic force of the spring 18 when the movable rod 17 rotates.

[0053] Specifically, an operating hole 26 communicating with the annular groove 24 is opened on the surface of the supporting plate 4 . This limitation allows a screwdriver or other rod-shaped object to be inserted into the operating hole 26 to squeeze the elastic clamp 25 stuck in the annular groove 24 out of the annular groove 24 .

[0054] Specifically, a second assembly groove 14 is opened inside the supporting plate 4, and the internal rotation connection of the second assembly groove 14 is connected to the limit gear 13. The side of the convex slider 9 away from the worm gear 10 is also fixedly connected to the rack 15. The limit gear 13 is engaged with the rack 15 on the side of the convex slider 9 away from the worm gear 10. The above technical solution improves the smoothness of the movement of the convex slider 9 in the concave slide groove 16.

[0055] Specifically, an operating circular hole 8 is provided at the bottom of the workbench 1 and is connected to the operating hole 26 on the supporting plate 4 fixed on the top of the workbench 1. The elastic clamp 25 can be squeezed through the provided operating circular hole 8 to squeeze the supporting plate 4 installed on the top of the workbench 1.

[0056] This embodiment provides a method for using the above-mentioned automobile fender forming device, and the method for using it is as follows:

[0057] S1. When installing the upper mold 5, insert the convex slider 9 on the upper mold 5 into the concave slide groove 16 on the carrying plate 4;

[0058] S2. When the rack 15 on the side of the convex slider 9 touches the worm gear 10, the movable rod 17 is pressed toward the worm gear 10, thereby squeezing the limiting toothed disc 22 into the interior of the inner gear ring 23, completing the unlocking of the movable rod 17. At this time, the spring 18 is in a compressed state.

[0059] S3. Continue to press the movable rod 17 toward the worm gear 10. When you hear a click, the end of the elastic clamp 25 away from the movable rod 17 is inserted into the annular groove 24. When the movable rod 17 is rotated, the elastic clamp 25 rotates in the annular groove 24. At this time, the spring 18 is in a compressed state. This operation prevents the movable rod 17 from inserting the limit toothed disc 22 into the inner gear ring 23 again under the elastic force of the spring 18 when the movable rod 17 rotates.

[0060] S4. Insert a hexagonal screwdriver into the hexagonal slot 27 and rotate the movable rod 17 clockwise, thereby driving the worm 11 to rotate clockwise, so that the worm wheel 10 drives the rack 15 to move toward the inside of the convex slider 9;

[0061] S5. When the convex slider 9 is completely inserted into the concave slide groove 16, a cross pick or other rod-shaped object is inserted into the operating hole 26, and one end of the elastic clamp 25 is clamped into the annular groove 24 and squeezed out of the annular groove 24. At this time, the movable rod 17 moves away from the worm gear 10 under the elastic force of the spring 18, and then the limiting toothed disc 22 is inserted into the inner gear ring 23 again, thus completing the installation of the upper mold 5.

[0062] S6, repeat the above steps S1-S5 to complete the installation of the lower mold 6;

[0063] S7, placing the fender blank to be stamped into the lower mold 6, then controlling the piston rod of the hydraulic cylinder 2 to extend, thereby closing the upper mold 5 and the lower mold 6, and stamping the fender blank;

[0064] S8. Control the piston rod of the hydraulic cylinder 2 to retract, thereby separating the upper mold 5 from the lower mold 6, and then take the stamped fender out of the lower mold 6.

[0065] The above describes in detail the automobile fender forming device and method of use provided by this application. The description of the specific embodiments is intended only to facilitate understanding of the method and core concepts of this application. It should be noted that those skilled in the art may make various improvements and modifications to this application without departing from the principles of this application, and such improvements and modifications are also within the scope of protection of the claims of this application.

Claims

1. A vehicle fender forming device, characterized in that: include: An upper mold (5) and a lower mold (6), wherein the top of the upper mold (5) and the bottom of the lower mold (6) are both fixedly connected with a convex sliding block (9); A carrying plate (4), wherein two carrying plates (4) are provided, wherein one of the carrying plates (4) is fixed to the top of the workbench (1), and the other carrying plate (4) is fixed to the bottom of the driving mechanism and is arranged above the workbench (1), a concave sliding groove (16) is provided on the side of the carrying plate (4), the convex sliding block (9) is slidably inserted into the inside of the concave sliding groove (16), and a locking mechanism for locking the convex sliding block (9) is provided inside the carrying plate (4); The upper mold (5) is arranged on the bottom of the carrying plate (4) connected to the driving mechanism, and the lower mold (6) is arranged on the top of the carrying plate (4) connected to the workbench (1); The upper mold (5) is located directly above the lower mold (6), and the driving mechanism is used to drive the upper mold (5) to move up and down; The locking mechanism comprises a worm wheel (10) and a worm (11); a first assembly groove (12) connected to one side of the concave sliding groove (16) is provided inside the bearing plate (4); the worm wheel (10) and the worm (11) are both rotatably arranged inside the first assembly groove (12); a rack (15) is fixedly connected to one side of the convex sliding block (9); the worm wheel (10) is meshed with the rack (15); the worm (11) is meshed with the worm wheel (10); and an anti-rotation component is arranged at one end of the worm (11); The anti-rotation assembly comprises a movable rod (17), a limiting toothed disc (22) and an inner toothed ring (23); a slot (21) communicating with the interior of the first assembly slot (12) is provided on one side of the bearing plate (4); an inner cavity (28) is provided at one end of the worm (11); the movable rod (17) is slidably inserted into the interior of the slot (21); one end of the movable rod (17) is slidably inserted into the interior of the inner cavity (28); and a limiting slot (19) is provided on the inner wall of the inner cavity (28). ), one end of the movable rod (17) close to the worm (11) is fixedly connected to a limiting block (20), the limiting block (20) is slidably arranged inside the limiting slot (19), the inner gear ring (23) is fixedly connected inside the end of the slot (21) away from the worm (11), the limiting toothed disc (22) is fixedly connected to the end of the movable rod (17) away from the worm (11), and the tooth head of the limiting toothed disc (22) is inserted into the tooth groove of the inner gear ring (23).

2. The automobile fender forming device according to claim 1, characterized in that: A spring (18) is disposed inside the inner cavity (28), one end of the spring (18) is pressed against one end of the movable rod (17), and the other end of the spring (18) is pressed against an inner wall at one end of the inner cavity (28).

3. The automobile fender forming device according to claim 2, characterized in that: The surface of the movable rod (17) is fixedly connected to one end of the elastic clamp (25); an annular groove (24) communicating with the slot (21) is provided inside the bearing plate (4); and one end of the elastic clamp (25) away from the movable rod (17) is slidably clamped inside the annular groove (24).

4. The automobile fender forming device according to claim 3, characterized in that: An operating hole (26) communicating with the annular groove (24) is provided on the surface of the carrying plate (4).

5. The automobile fender forming device according to claim 4, characterized in that: A second assembly groove (14) is provided inside the bearing plate (4), and a limit gear (13) is rotatably connected inside the second assembly groove (14). The side of the convex slider (9) away from the worm gear (10) is also fixedly connected to the rack (15), and the limit gear (13) is meshed with the rack (15) on the side of the convex slider (9) away from the worm gear (10).

6. The automobile fender forming device according to claim 5, characterized in that: The bottom of the workbench (1) is provided with an operating circular hole (8) which is connected to an operating hole (26) on a supporting plate (4) fixed on the top of the workbench (1).

7. The automobile fender forming device according to claim 6, characterized in that: The driving mechanism comprises a hydraulic cylinder (2) and a top plate (3), the four corners of the bottom of the top plate (3) are fixedly connected to guide columns (7), the bottom of the guide columns (7) is fixedly connected to the top of the workbench (1), the bearing plate (4) connected to the upper mold (5) is slidably mounted on the guide columns (7) through a sliding sleeve, the hydraulic cylinder (2) is fixed to the top of the top plate (3), and the bottom of the piston rod of the hydraulic cylinder (2) slides through the top plate (3) and is fixedly connected to the top of the bearing plate (4) connected to the upper mold (5).

8. A method for using the automobile fender forming device according to claim 7, characterized in that: The steps include: S1. When installing the upper mold (5), insert the convex sliding block (9) on the upper mold (5) into the concave sliding groove (16) on the bearing plate (4); S2, when the rack (15) on the side of the convex slider (9) touches the worm wheel (10), the movable rod (17) is pressed in the direction close to the worm wheel (10), thereby squeezing the limit toothed disc (22) into the interior of the inner toothed ring (23), thereby completing the unlocking of the movable rod (17), and at this time, the spring (18) is in a compressed state; S3, continue to squeeze the movable rod (17) in the direction close to the worm gear (10), when a click sound is heard, the end of the elastic clamp (25) away from the movable rod (17) is inserted into the inner part of the annular groove (24), and the spring (18) is in a compressed state. This operation prevents the movable rod (17) from rotating and inserting the limit toothed disc (22) into the inner toothed ring (23) again under the elastic force of the spring (18); S4, rotating the movable rod (17) clockwise, thereby driving the worm (11) to rotate clockwise, thereby causing the worm wheel (10) to drive the rack (15) to move toward the inside of the convex slider (9); S5. When the convex slider (9) is completely inserted into the concave slide groove (16), a cross pick or other rod-shaped object is inserted into the operating hole (26) to clamp one end of the elastic clamp (25) into the annular groove (24) and squeeze it out of the annular groove (24). At this time, the movable rod (17) moves away from the worm wheel (10) under the elastic force of the spring (18), and then the limit toothed disc (22) is inserted into the inner toothed ring (23) again, thereby completing the installation of the upper mold (5); S6, repeat the above steps S1-S5 to complete the installation of the lower mold (6); S7, placing the fender blank to be stamped into the lower die (6), and then controlling the piston rod of the hydraulic cylinder (2) to extend, thereby closing the upper die (5) and the lower die (6), and stamping the fender blank; S8, control the piston rod of the hydraulic cylinder (2) to retract, thereby separating the upper mold (5) from the lower mold (6), and then taking the stamped fender out of the lower mold (6).

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