Multi-linkage inclined wedge mechanism for eliminating negative angle

Abstract

The invention discloses a multi-linkage inclined wedge stamping mechanism for eliminating a negative angle, which belongs to the technical field of stamping dies, and is characterized in that the multi-linkage inclined wedge stamping mechanism comprises an upper die body, a suspension sliding block, an operation insert, a lower die body, a driving block and a cover plate, and the suspension sliding block is in sliding connection with the upper die body; the lower end of the suspension sliding block is connected with the second guide plate; a driving block is mounted on the lower body, the driving block is in sliding connection with the lower body, and the driving block is in sliding connection with the lower body; a first stroke guide plate is mounted at the other side end of the driving block; a base is installed on the lower body, and the two sides of the base are connected with the lower body in a sliding mode. Compared with the prior art, the device has the characteristics of reduced size and convenience in arrangement of the driving blocks.

Description

Technical Field

[0001] The invention relates to the technical field of stamping dies, in particular to a multi-linkage oblique wedge stamping mechanism for eliminating negative angles. Background Art

[0002] The manufacturing of automobiles requires four major processes: stamping, welding, painting, and assembly. During the stamping process, the coils used for automobile covers need to go through processes such as ribbon cutting, drawing, trimming, punching, flanging, and shaping to become sheet metal parts. Sheet metal parts often have negative angles due to the needs of assembly. In the flanging and shaping process, when the sheet forms a negative angle after the operation is completed, if the sheet is not avoided when taking out the sheet, it will be stuck in the negative angle and cannot be taken out. Therefore, when a negative angle is formed after the operation, a structure to avoid the negative angle needs to be designed on the mold structure.

[0003] In the current prior art, there are two main structures commonly used to eliminate negative angles in mold structure design: a rotating oblique wedge structure and a double-acting slider oblique wedge structure. Currently, these two structures have been widely used, but some problems have gradually been found in the actual use of these two oblique wedge structures.

[0004] When using a rotary bevel structure, the structural design eliminates interference at negative angles by rotating the axis at a certain angle, and the space occupied is relatively small. However, a series of problems were found during the processing: ① When machining a rotating shaft, it is necessary to design a counterweight for the rotating shaft in order to ensure the rotational balance of the shaft. That is, a casting that complements the existing rotating shaft is made to form a cylinder with the rotating shaft in order to maintain balance during rotation.

[0005] ② The diversity of materials of various parts of the rotating bevel. In order to avoid frequent rotation of the rotating shaft and adhesion of the contacting components during operation, the rotating shaft, base and cover plate are made of different materials; the material of the cover plate is also different depending on whether there is any work content.

[0006] ③ The biggest impact on the structure of the bevel wedge is the high processing cost. Different styles of rotating shafts are selected according to the different parts of the sheet metal. Some are through-shafts, some are single-sided through-shafts, some are tapered shafts, and some are stepped shafts. The requirements for mechanical processing are high, so the machining cost of the rotating bevel wedge has remained high.

[0007] When using a double-acting slider wedge, the structural design eliminates interference at the negative angle by retracting the slider for a certain distance. Although this structure solves the problem of high machining cost of the rotating axis, the entire structure occupies a relatively large space, which brings some difficulties in the structural design process: ① The structure occupies a large space, and some protruding structures, such as the drive block, are more likely to interfere with the robot arm that picks up parts during operation.

[0008] ② The structure occupies a large space, and it is difficult to design the structure for smaller sheet metal parts or smaller spaces.

[0009] ③ The double-slider bevel wedge needs to integrate the operating sequence of the slider, the pressing core and the suspended bevel wedge, and you need to be familiar with the entire operating sequence and the stroke diagram before you can use it. Summary of the invention

[0010] The purpose of the present invention is to address the deficiencies of the above prior art and provide a multi-linkage oblique wedge punching mechanism that eliminates negative angles, thereby solving the problem of difficult arrangement of the drive block.

[0011] The multi-linkage oblique wedge punching mechanism for eliminating negative angles provided by the present invention is characterized in that it includes an upper mold body, a suspension slider, an operating insert, a lower mold body, a driving block and a cover plate, wherein the suspension slider is slidably connected to the upper mold body, and the suspension slider and the upper mold body are connected by a first nitrogen spring; the lower end of the suspension slider is connected to the second guide plate, and during operation, the suspension slider contacts the guide sliding surface of the lower mold body through the second guide plate, and the operating insert installed on the suspension slider operates; a driving block is installed on the lower mold body, and both sides of the driving block are slidably connected to the lower mold body through a third guide plate, and the bottom of the driving block is slidably connected to the lower mold body through a fourth guide plate; the bottom of the driving block is connected to the lower mold body through a second nitrogen spring, and the top of the second nitrogen spring is connected to the lower mold body. On the driving block, a first stroke guide is installed at the end of the other side of the driving block; a base is installed on the lower mold body, and both sides of the base are slidably connected with the lower mold body, a second stroke guide is installed at one end of the base, the second stroke guide is in contact with the first stroke guide, and the second stroke guide and the first stroke guide are respectively provided with correspondingly arranged inclined surfaces, the base is slidably matched with the upper slider, the base is slidably connected with the lower mold body, the base is connected with a cover plate through a third nitrogen spring, and the third nitrogen spring is pressed on the cover plate; an upper slider is installed above the driving block, and both ends of the upper slider are slidably connected with the cover plate, the upper part of the upper slider is matched with the cover plate, and the lower part is matched with the driving block; a fourth nitrogen spring is installed on the upper part of the upper slider, and the other end of the fourth nitrogen spring is pressed on the cover plate, and the cover plate is fixed on the lower mold body.

[0012] Furthermore, two first pressure plates are installed on the upper mold body, the suspension slider is placed between the two first pressure plates, first guide plates are installed at both ends of the suspension slider, and the first guide plates are slidably connected to the upper mold body so that the suspension slider can only move in one direction relative to the upper mold body.

[0013] Furthermore, a first limit block is installed at the end of the upper body, and the first limit block limits the travel of the suspension slider.

[0014] Furthermore, a first V-shaped guide plate is installed on the lower body, a V-shaped slide groove is provided on the upper end of the suspension slider, and the first V-shaped guide plate is slidably matched with the V-shaped slide groove of the suspension slider.

[0015] Furthermore, a forced return hook is installed on the lower mold body, and the forced return hook is hooked on the two end walls of the suspension slider to prevent the suspension slider from directly rising for the return stroke after the operation is completed.

[0016] Furthermore, a second V-shaped guide plate is installed on the lower mold body, and a V-shaped groove is provided at the lower end of the driving block. The second V-shaped guide plate is placed in the V-shaped groove of the driving block, and the two are slidably matched. The second V-shaped guide plate performs motion guidance on the driving block and the lower mold body.

[0017] Furthermore, a second pressing plate is installed on the lower mold body, and a slide groove is formed between the second pressing plate and the lower mold body. The base is placed in the slide groove between the second pressing plate and the lower mold body, so that the base can only slide in one direction.

[0018] Compared with the prior art, the present invention has the following outstanding beneficial effects: 1. The present invention utilizes a combination of a suspended oblique wedge and a reverse oblique wedge to eliminate the negative angle of the product, and achieves positioning and operation in sequence according to the sequence of travel; 2. In the present invention, the multi-linkage oblique wedge is in place first before the pressing core contacts the plate, that is, AF>AJ. When the condition is not met, the stroke OB of the hanging oblique wedge can be increased to achieve early arrival of the multi-linkage oblique wedge, so as to avoid the pressing core pressing the plate first while the multi-linkage oblique wedge is not in place, causing the plate to be deformed due to stress; 3. The present invention adopts the form of suspension slider driving, cancels the independent driving form of the double-acting slider wedge, and solves the problem of difficult arrangement position of the driving block; 4. The present invention solves the problem that the mold storage height is too high and cannot enter the production line. When the mold is stored, the inclined wedge must be in the return state, and the driving block stroke of the double-acting slider inclined wedge is large. The nitrogen spring used for storage requires a large stroke to lift the upper mold body, resulting in a high mold storage height. When the mold enters the production line, it interferes with the door opening of the production line. The return state of the multi-linkage inclined wedge is not related to the mold storage height, avoiding this kind of interference problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the initial state of operation of the present invention; Figure 2 It is a structural schematic diagram of the operation completion state of the present invention; Figure 3 It is a structural schematic diagram of the suspension slider part of the present invention; Figure 4It is a structural schematic diagram of a partial working state of the suspension slider of the present invention; Figure 5 The structure of the drive block part of the present invention is schematically shown in FIG. Figure 1 ; Figure 6 The structure of the drive block part of the present invention is schematically shown in FIG. Figure 2 ; Figure 7 It is a schematic structural diagram of the base portion of the present invention; Figure 8 The structure of the upper slider of the present invention is shown in FIG. Figure 1 ; Fig. 9 The structure of the upper slider of the present invention is shown in FIG. Figure 2 ; Fig.10 It is a schematic diagram of the assembly structure of the upper slider of the present invention; Fig.11 It is a structural process diagram of the present invention; Among them, 1. upper body; 2. suspension slider; 3. working insert; 4. first guide plate; 5. first pressure plate; 6. forced return hook; 7. second guide plate; 8. first nitrogen spring; 9. first limit block; 10. lower body; 11. first V-shaped guide plate; 12. drive block; 13. third guide plate; 14. fourth guide plate; 15. second V-shaped guide plate; 16. second nitrogen spring; 17. polyurethane cushion; 18. fifth guide plate; 19. first stroke guide plate; 20. base; 21. sixth guide plate; 22. second pressure plate; 23. seventh guide plate; 24. third nitrogen spring; 25. second limit block; 26. eighth guide plate; 27. second stroke guide plate; 28. upper slider; 29. ​​ninth guide plate; 30. tenth guide plate; 31. cover plate; 32. eleventh guide plate; 33. positioning key; 34. fourth nitrogen spring. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0021] like Figure 1 and 2 As shown, the present invention includes an upper mold body 1, a suspension slider 2, a working insert 3, a lower mold body 10, a driving block 12 and a cover plate 31.

[0022] like Figure 3 and 4As shown, the suspension slider 2 is slidably connected to the upper mold body 1, two first pressure plates 5 are installed on the upper mold body 1, the suspension slider 2 is placed between the two first pressure plates 5, and first guide plates 4 are installed at both ends of the suspension slider 2. The first guide plates 4 are slidably connected to the upper mold body 1, so that the suspension slider 2 can only move in one direction relative to the upper mold body 1. The suspension slider 2 is connected to the upper mold body 1 through a first nitrogen spring 8. When the operation is completed, the suspension slider 2 is reset by the return stroke of the first nitrogen spring 8, and a first limit block 9 is installed at the end of the upper mold body 1. The first limit block 9 limits the stroke of the suspension slider 2.

[0023] The lower end of the suspension slider 2 is connected to the second guide plate 7. During operation, the suspension slider 2 contacts the guide surface of the lower mold body 10 through the second guide plate 7. The lower mold body 10 is equipped with a first V-shaped guide plate. The upper end of the suspension slider 2 is provided with a V-shaped slide groove. The first V-shaped guide plate 11 slides in cooperation with the V-shaped slide groove of the suspension slider 2. The working insert 3 installed on the suspension slider 2 performs operation. The lower mold body 10 is equipped with a forced return hook 6. The forced return hook 6 is hooked on the two end walls of the suspension slider 2 to prevent the suspension slider 2 from directly rising for return after the operation is completed.

[0024] like Figure 5 and 6 As shown, a driving block 12 is installed on the lower mold body 10, and the two sides of the driving block 12 are slidably connected to the lower mold body 10 through the third guide plate 13, and the third guide plate 13 limits the freedom of the driving block 12 to move left and right and rotate. The bottom of the driving block 12 is slidably connected to the lower mold body 10 through the fourth guide plate 14, and the fourth guide plate 14 limits the up and down freedom of the driving block 12. A second V-shaped guide plate 15 is installed on the lower mold body 10, and a V-shaped groove is provided at the lower end of the driving block 12. The second V-shaped guide plate is placed in the V-shaped groove of the driving block 12, and the two are slidably matched. The second V-shaped guide plate performs motion guidance on the driving block 12 and the lower mold body 10.

[0025] The driving block 12 is installed with a fifth guide plate 18 and a polyurethane buffer pad 17 on one side close to the suspension slider 2. The bottom of the driving block 12 is connected to the lower mold body 10 through a second nitrogen spring 16. The second nitrogen spring 16 is supported on the driving block 12. The first travel guide plate 19 is installed on the other end of the driving block 12.

[0026] like Figure 7As shown, a base 20 is installed on the lower mold body 10, and both sides of the base 20 are slidably connected with the lower mold body 10 through a sixth guide plate 21. A second pressing plate 22 is installed on the lower mold body 10, and the second pressing plate 22 and the lower mold body 10 form a slide groove. The base 20 is placed in the slide groove between the second pressing plate 22 and the lower mold body 10, so that the base 20 can only slide in one direction. A second stroke guide plate 27 is installed at one end of the base 20, and the second stroke guide plate 27 is in contact with the first stroke guide plate 19. The second stroke guide plate 27 and the first stroke guide plate 19 are respectively provided with correspondingly arranged inclined surfaces. An eighth guide plate 26 is installed at the other end of the base 20, and the base 20 is slidably connected with the lower mold body 10 through the seventh guide plate 23. The base 20 is connected with a cover plate 31 through a third nitrogen spring 24, and the third nitrogen spring 24 is pressed on the cover plate 31. A second limit block 25 is installed on the lower mold body 10, and the distance between the second limit block 25 and the base 20 is its stroke distance.

[0027] like Figures 8-10 As shown, an upper slider 28 is installed above the driving block 12, and both ends of the upper slider 28 are slidably connected with the cover plate 31 through the ninth guide plate 29 respectively. The ninth guide plate 29 limits the freedom of the upper slider 28 to move left and right. The upper part of the upper slider 28 is respectively installed with an eleventh guide plate 32, a positioning key 33 and a fourth nitrogen spring 34. The eleventh guide plate 32 cooperates with the cover plate 31, and the lower part is installed through the tenth guide plate 30 to cooperate with the driving block 12 to limit its freedom of up and down movement.

[0028] The base 20 is slidably matched with the upper slider 28 via the eighth guide plate 26 .

[0029] In order to make it move more accurately, a positioning key 33 is installed in the middle of the upper slider 28 to contact the cover plate 31. A fourth nitrogen spring 34 is installed on the upper part of the upper slider 28, and its other end is against the cover plate 31. The cover plate 31 is fixed on the lower mold body 10.

[0030] The operation process is as follows: Fig.11As shown, during operation, the upper mold body 1 moves downward with the suspension slider 2, and when the distance reaches 93.65MM from the closed state, the second guide plate 77 on the suspension slider 2 contacts the lower mold body 10, OC=93.65MM is the height at which the suspension slider 2 contacts the lower mold body 10, and the operating angle of the suspension slider 2 is 11°. As the height decreases, it moves along the guide sliding surface of the lower mold body 10, and the suspension slider 2 contacts the drive block 12 and pushes the drive block 12 to move. The retraction angle of the upper slider 28 is 8°. At this time, the operating angle of the suspension slider 2 is different from the retraction angle of the upper slider 28, and the suspension slider 22 is relative to the upper mold body. The movement stroke of 1 is OB=120MM, the structural angle of the suspension slider 2 is 50°, and the movement stroke relative to the lower mold body 10 is OA=95MM. The retreat angle of OA along the upper slider 28 is decomposed into OG and AG, AG=OA·COS(11°-8°)=94.87MM, that is, AG is used as the driving stroke of the driving block 12. The fourth guide plate 14 of the driving block 12 moves along the guide sliding surface of the lower mold body 10. The first stroke guide plate 19 of the driving block 12 contacts the second stroke guide plate 27 of the base 20 and pushes the base 20 to move in a direction perpendicular to the movement direction of the driving block 12. The seventh guide plate 27 of the base 20 23 moves along the guide sliding surface of the lower body 10, JH=40MM is the movement stroke of the base 20, the second nitrogen spring 16 of the driving block 12 and the third nitrogen spring 24 of the base 20 are compressed, the eighth guide plate 26 of the base 20 contacts the upper slider 28 and pushes it to move, the stroke of the upper slider 28 is HK=40MM, the tenth guide plate 30 under the upper slider 28 contacts the guide sliding surface of the driving block 12, the eleventh guide plate 32 contacts the guide sliding surface of the cover plate 31, the eighth guide plate 26, the tenth guide plate 30 and the eleventh guide plate 32 jointly restrict the upper slider 28 so that it can only move along the HK direction, the fourth nitrogen spring 3 4 compression, at this time, the upper slider 28 is in place, the upper slider 28 is aligned with the cover plate 31, and the working insert 3 has not yet contacted the upper slider 28 to work, so the suspension slider 2 needs to continue to move. When it is 50MM away from the closed height, the pressing core contacts the plate to press the material, and the suspension slider 2 continues to move. At this time, the base 20 and the upper slider 28 are in place and no longer move. The inclined surface movement of the first stroke guide plate 19 of the driving block 12 and the second stroke guide plate 27 of the base 20 ends and starts plane movement. The suspension slider 2 continues to move to form IL=54.87MM. At this time, the working insert 3 contacts the upper slider 28 to work. After the operation is completed, the upper body 1 rises, and the suspension slider 2 returns by the first nitrogen spring 8 with a stroke of OB=120MM. The driving block 12 also returns together with the second nitrogen spring 16. When the return stroke is within IL=54.87MM, the base 20 and the upper slider 28 remain stationary. When it is greater than IL=54.87MM, the base 20 is affected by the third nitrogen spring 24 and the upper slider 28 is affected by the fourth nitrogen spring 34 to return together.After the return stroke is completed, the suspension slider 2 leaves together with the upper body 1. At this time, the upper slider 28 returns to its position, and the polyurethane buffer pad 17 contacts the lower body 10 to play a buffering and limiting role. The second nitrogen spring 16, the third nitrogen spring 24 and the fourth nitrogen spring 34 are in a free state. The drive block 12, the base 20 and the upper slider 28 all return to their positions. At this time, the panel after the operation is completed can be taken out and the next operation can be carried out.

[0031] It should be noted that the specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes to the present invention without departing from the spirit and scope of the present invention are within the protection scope of the present invention.

Claims

1. A multi-linkage oblique wedge punching mechanism for eliminating negative angles, characterized in that: The invention comprises an upper mold body (1), a suspension slider (2), an operation insert (3), a lower mold body (10), a driving block (12) and a cover plate (31); the suspension slider (2) is slidably connected to the upper mold body (1); the suspension slider (2) and the upper mold body (1) are connected via a first nitrogen spring (8); the lower end of the suspension slider (2) is connected to a second guide plate (7); during operation, the suspension slider (2) contacts the guide surface of the lower mold body (10) via the second guide plate (7); and the suspension slider (2) is installed on the suspension slider (2). The working insert (3) performs the operation; a driving block (12) is installed on the lower mold body (10); the two sides of the driving block (12) are slidably connected to the lower mold body (10) through a third guide plate (13); the bottom of the driving block (12) is slidably connected to the lower mold body (10) through a fourth guide plate (14); the bottom of the driving block (12) is connected to the lower mold body (10) through a second nitrogen spring (16); the second nitrogen spring (16) is pressed against the driving block (12); the first travel guide is installed at the other end of the driving block (12) (19); A base (20) is mounted on the lower mold body (10), and both sides of the base (20) are slidably connected to the lower mold body (10). A second travel guide plate (27) is mounted on one end of the base (20), and the second travel guide plate (27) is in contact with the first travel guide plate (19). The second travel guide plate (27) and the first travel guide plate (19) are respectively provided with correspondingly arranged inclined surfaces. The base (20) is slidably matched with the upper slider (28), and the base (20) is slidably connected to the lower mold body (10). The base (20) is connected to the lower mold body (10). The third nitrogen spring (24) is connected with a cover plate (31), and the third nitrogen spring (24) is pressed against the cover plate (31); an upper slider (28) is installed above the driving block (12), and both ends of the upper slider (28) are slidably connected to the cover plate (31), the upper part of the upper slider (28) is matched with the cover plate (31), and the lower part is matched with the driving block (12); a fourth nitrogen spring (34) is installed on the upper part of the upper slider (28), and the other end of the fourth nitrogen spring (34) is pressed against the cover plate (31), and the cover plate (31) is fixed to the lower mold body (10).

2. A multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: Two first pressure plates (5) are installed on the upper mold body (1), and the suspension slider (2) is placed between the two first pressure plates (5). First guide plates (4) are installed at both ends of the suspension slider (2). The first guide plates (4) are slidably connected to the upper mold body (1), so that the suspension slider (2) can only move in one direction relative to the upper mold body (1).

3. The multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: A first limit block (9) is installed at the end of the upper body (1), and the first limit block (9) limits the travel of the suspension slider (2).

4. The multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: A first V-shaped guide plate (11) is mounted on the lower body (10), a V-shaped slide groove is provided at the upper end of the suspension slider (2), and the first V-shaped guide plate (11) is slidably matched with the V-shaped slide groove of the suspension slider (2).

5. The multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: A forced return hook (6) is installed on the lower mold body (10), and the forced return hook (6) is hooked on the two end walls of the suspension slider (2) to prevent the suspension slider (2) from directly rising for the return stroke after the operation is completed.

6. The multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: A second V-shaped guide plate (15) is installed on the lower mold body (10), and a V-shaped groove is provided at the lower end of the driving block (12). The second V-shaped guide plate (15) is placed in the V-shaped groove of the driving block (12), and the two are slidably matched. The second V-shaped guide plate (15) performs motion correction on the driving block (12) and the lower mold body (10).

7. The multi-linkage oblique wedge punching mechanism for eliminating negative angles according to claim 1, characterized in that: A second pressing plate (22) is mounted on the lower mold body (10), the second pressing plate (22) and the lower mold body (10) form a slide groove, and the base (20) is placed in the slide groove between the second pressing plate (22) and the lower mold body (10), so that the base (20) can only slide in one direction.

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