Forming die for ascending pipe on automobile seat

Abstract

The utility model provides a forming die for an ascending pipe on an automobile seat, which is characterized in that a concave die plate is arranged in the center of the top end of a lower die plate, and a concave die mounting groove is formed in the center of the top of the concave die plate; the assembled female die and the discharging positioning module are clamped in the female die mounting groove; the upper die plate is located over the assembled female die and the discharging positioning module, the male die plate is arranged at the bottom of the upper die plate, the combined forming male die is arranged in the center of the bottom of the male die plate, and the locking positioning module is arranged between the lower die plate and the upper die plate. A material plate of an ascending pipe on an automobile seat of a plane part is placed on the side wall bending forming female die block with the higher height, the left side of the material plate is limited through the female die and the material positioning rod, and the female die and the right side of the material positioning rod are bent so that the side wall bending forming female die block on the other side of the bottom of the material positioning rod can make contact. During stamping, the male die plate is downwards combined with the female die plate along the guide rod, the machining precision is high, the machining efficiency is high, and the stamping die is suitable for batch production.

Description

Technical Field

[0001] The utility model relates to the field of mold design, in particular to the field of forming processing technology for the rising pipe on an automobile seat, and specifically relates to a forming mold for the rising pipe on an automobile seat. Background Art

[0002] When processing the rising pipe on an automobile seat, it is necessary to bend and shape the blank plate after blanking so that it changes from a flat part to a three-dimensional part. Since the shape of the rising pipe on the automobile seat is complex, the heights on the left and right sides are different, and two through holes need to be opened at the top. If manual bending or bending with a bending machine is used for forming, multiple processes are required, the processing is relatively cumbersome, and the processing accuracy is low, which is not suitable for mass production. Therefore, it is necessary to design a one-time stamping forming mold for the rising pipe on an automobile seat. Summary of the Invention

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a forming mold for the rising pipe on an automobile seat to solve the difficulties of the prior art.

[0004] To achieve the above purpose and other related purposes, the present utility model provides a forming mold for the rising pipe on an automobile seat, including:

[0005] A lower template 1, a concave template 11 is connected and arranged at the center of the top end of the lower template 1 through bolts, and a die cavity installation groove 12 is arranged at the center of the top of the concave template 11;

[0006] A split-type die cavity and a blank feeding and positioning module 2, which is clamped in the die cavity installation groove 12;

[0007] An upper template 3, which is located directly above the split-type die cavity and the blank feeding and positioning module 2. A convex template 31 is connected and arranged at the bottom of the upper template 3 through bolts, and a punch installation groove 32 is arranged at one side of the center of the top of the convex template 31;

[0008] A combined forming punch 4, which is connected and arranged at the center of the bottom of the convex template 31 through bolts, and one side of the combined forming punch 4 is clamped in the punch installation groove 32;

[0009] A stop positioning module 5, which is connected and arranged between the lower template 1 and the upper template 3 through bolts, and the stop positioning module 5 is located on the left and right sides of the concave template 11 and the convex template 31.

[0010] According to the preferred solution, the split-type die cavity and the blank feeding and positioning module 2 include:

[0011] Bottom forming female die 21, the top of the bottom forming female die 21 is arranged at the center of the bottom of the female die installation groove 12, the bottom of the bottom forming female die 21 passes through the female die plate 11 and is connected to the lower template 1 by bolts, and two material collecting holes 22 are spaced apart at the top of the bottom forming female die 21;

[0012] Female die installation positioning holes 23, the female die installation positioning holes 23 are opened at the bottom of the female die installation groove 12 around the bottom forming female die 21;

[0013] Female die and material positioning rod 24, the female die and material positioning rod 24 is L-shaped with a vertical rod at the bottom and a horizontal rod at the top. The bottom of the vertical rod in the female die and material positioning rod 24 is clamped in the female die installation positioning hole 23. A side wall bending forming female die block 25 is sleeved on the top of the vertical rod in the female die and material positioning rod 24. The bottom of the side wall bending forming female die block 25 is clamped at the four corners around the female die installation groove 12. The bottom of the side wall bending forming female die block 25 is connected to the female die plate 11 by bolts. The side of the side wall bending forming female die block 25 close to the center line of the female die installation groove 12 is joined with the bottom forming female die 21, and the top horizontal rod of the female die and material positioning rod 24 is connected to the side wall bending forming female die block 25 by bolts.

[0014] According to the preferred scheme, one side of the female die formed by the bottom forming female die 21 and the side wall bending forming female die block 25 is higher than the other side. The height of the side wall bending forming female die block 25 on the side close to the punch installation groove 32 is greater than the height of the other side wall bending forming female die block 25.

[0015] According to the preferred scheme, the combined forming punch 4 includes:

[0016] Groove forming punch rod 41, there are 3 groove forming punch rods 41, and the 3 groove forming punch rods 41 are arranged at intervals at the center of the top of the punch plate 31. One side of the groove forming punch rod 41 is arranged in the female die installation groove 12. The tops of the 3 groove forming punch rods 41 pass through the punch plate 31 and the upper template 3 in sequence. The bottom of the groove forming punch rod 41 is a quadrilateral punch head, and the outer diameter of the middle rod body of the groove forming punch rod 41 is smaller than the outer diameter of the top round clamping platform;

[0017] Punching punch rod 42, the punching punch rod 42 is located directly above the material collecting hole 22. The punching punch rods 42 are arranged at the center of the top of the punch plate 31. The punching punch rods 42 are located between the adjacent groove forming punch rods 41. One side of the punching punch rod 42 is arranged in the female die installation groove 12. The tops of the punching punch rods 42 pass through the punch plate 31 and the upper template 3 in sequence. A chamfer is provided at the lower end of the punch head at the bottom of the punching punch rod 42, and the outer diameter of the middle rod body of the punching punch rod 42 is smaller than the outer diameter of the top round clamping platform;

[0018] The first punching block 43 is clamped in the die mounting groove 12. The first punching block 43 is sleeved outside the groove forming punch rod 41 and the punching punch rod 42. The bottom of the first punching block 43 is connected to the convex template 31 by bolts;

[0019] The second punching block 44 is arranged on the top of the convex template 31 on one side of the first punching block 43. One side surface of the second punching block 44 is attached to the side surface of the first punching block 43. The bottom of the second punching block 44 is connected to the convex template 31 by bolts. The second punching block 44 is sleeved outside the groove forming punch rod 41 and the punching punch rod 42. Forming punch platforms 45 are arranged on the front and rear sides of the second punching block 44. The bottom of the forming punch platform 45 is engaged with the side wall bending forming die block 25 directly below.

[0020] According to the preferred solution, the second punching block 44 and the forming punch platform 45 are an integral body.

[0021] According to the preferred solution, the stop positioning module 5 includes:

[0022] The guide blocks 51 are arranged on the left and right sides of the convex template 31 and the concave template 11. The top of the guide blocks 51 arranged on both sides of the convex template 31 is connected to the upper template 3 by bolts. The bottom of the guide blocks 51 arranged on both sides of the concave template 11 is connected to the lower template 1 by bolts. A guide groove 52 is arranged on the side of the guide block 51 away from the convex template 31 or the concave template 11;

[0023] The guide rods 53 are clamped in the guide grooves 52. The guide rods 53 are connected to the guide blocks 51 arranged on both sides of the concave template 11 by bolts;

[0024] There are two groups of stop columns 54. The two groups of stop columns 54 are sequentially arranged on the sides of the upper template 3 and the lower template 1 close to each other by bolts. The stop columns 54 are located around the convex template 31 or the concave template 11. The bottom end of the stop column 54 arranged on the upper template 3 contacts the stop column 54 arranged on the top end of the lower template.

[0025] The utility model adopts a lower template, a split-type female die and a blank feeding and positioning module, an upper template, a combined forming male die and a stop positioning module. The blank of the riser pipe on the automobile seat of the planar part is placed on the side wall bending forming female die block with a higher height. The front and rear sides on the left side of the blank are limited by the female die and the material positioning rod. The right side of the female die and the material positioning rod is bent so that the bottom thereof contacts the side wall bending forming female die block with a lower height. The front and rear sides on the right side thereof are limited by the female die and the material positioning rod. During stamping, the convex template moves downward along the guide rod to close the die with the concave template, and the blank of the riser pipe on the automobile seat is pressed into the forming cavity formed by the side wall bending forming female die block and the bottom forming female die. The processing precision is high, the forming process is completed in one process, and the processing efficiency is high, which is suitable for mass production.

[0026] In the following, the optimal embodiments for implementing the utility model will be described in more detail with reference to the accompanying drawings, so as to easily understand the features and advantages of the utility model. Brief Description of the Drawings

[0027] Figure 1 Showing a three-dimensional structural schematic diagram of the utility model;

[0028] Figure 2 Showing an enlarged three-dimensional structural schematic diagram of the split-type female die and the blank feeding and positioning module in the utility model;

[0029] Figure 3 Showing an enlarged three-dimensional structural schematic diagram of the concave template in the utility model;

[0030] Figure 4 Showing an enlarged three-dimensional structural schematic diagram of the combined forming male die in the utility model;

[0031] Figure 5 Showing an enlarged three-dimensional structural schematic diagram of the convex template in the utility model;

[0032] Figure 6 Showing an enlarged three-dimensional structural schematic diagram of the groove forming punch rod and the punching punch rod in the utility model;

[0033] Figure 7 Showing a schematic diagram when the blank of the riser pipe on the automobile seat to be processed by the utility model is placed for feeding;

[0034] Figure 8 Showing a schematic diagram of the formed part of the riser pipe on the automobile seat to be processed;

[0035] Label Description

[0036] 1. Lower template; 11. Concave template; 12. Female die installation groove;

[0037] 2. Assembled female die and blank feeding and positioning module; 21. Bottom forming female die; 22. Aggregate hole; 23. Female die installation and positioning hole; 24. Female die and material positioning rod; 25. Side wall bending forming female die block;

[0038] 3. Upper template; 31. Convex template; 32. Punch installation groove;

[0039] 4. Composite forming punch; 41. Groove forming punch rod; 42. Punching punch rod; 43. First punch block; 44. Second punch block; 45. Forming punch table;

[0040] 5. Stopping and positioning module; 51. Guide block; 52. Guide groove; 53. Guide rod; 54. Stopping column; Detailed implementation manners

[0041] In order to make the objectives, technical solutions and advantages of the technical solutions of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings of the specific embodiments of the present utility model. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0042] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present utility model may have fewer components, have other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0043] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this utility model pertains. The terms "first", "second" and similar terms used in the description and claims of this utility model patent application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily denote a quantity limitation. Terms such as "comprising" or "including" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] The present utility model provides a forming die for a riser tube on an automotive seat, which is used in the one-time forming process of the riser tube on the automotive seat. The lower template 1, the assembled female die and the blanking positioning module 2, the upper template 3, the combined male die 4 and the stop positioning module 5 are particularly suitable for the stamping process of the riser tube on the automotive seat.

[0045] Generally speaking, the forming die for the riser tube on the automotive seat proposed by the present utility model mainly includes: the lower template 1, the assembled female die and the blanking positioning module 2, the upper template 3, the combined male die 4 and the stop positioning module 5. Among them, reference can be made to Figure 1 , which shows the layout relationship of the lower template 1, the assembled female die and the blanking positioning module 2, the upper template 3, the combined male die 4 and the stop positioning module 5.

[0046] When the forming die for the riser tube on the automotive seat proposed by the present utility model is in use, the lower template 1 and the upper template 3 are installed on a stamping machine, and then as Figure 7 shown, the blanking plate of the riser tube on the automotive seat of the flat part is placed on the side wall bending forming concave module 25 with a higher height. The front and rear sides on the left side of the blanking plate are limited by the female die and the material positioning rod 24. The right side of the female die and the material positioning rod 24 is bent so that its bottom contacts the side wall bending forming concave module 25 with a lower height. The front and rear sides on the right side of it are limited by the female die and the material positioning rod 24. During stamping, the convex template 31 moves downward along the guide rod 53 to close the die with the concave template 11, and the blanking plate of the riser tube on the automotive seat is pressed into the forming cavity formed by the side wall bending forming concave module 25 and the bottom forming female die 21, completing as Figure 8The forming process of the material plate of the riser pipe on the vehicle seat has high processing accuracy and can complete the forming process in one step. It should be noted that the heights on the left and right sides of the riser pipe on the vehicle seat are different, so the heights on the left and right sides of the corresponding combined forming punch 4 are also different. The side with the lower height is U-shaped, so the second punch block 44 and the forming punch table 45 are correspondingly designed. The groove forming punch rod 41 and the punching punch rod 42 are separately arranged because if the forming groove and the punching area are designed integrally, the wear of the punch block is relatively fast and the cost of replacing the punch block is relatively high. The separately arranged groove forming punch rod 41 and punching punch rod 42 have a low cost.

[0047] The above-mentioned assembled female die and the blank feeding and positioning module 2 are clamped in the female die installation groove 12. The assembled female die and the blank feeding and positioning module 2 include: a bottom forming female die 21, a female die installation positioning hole 23, a female die and a material positioning rod 24, and a side wall bending forming female die block 25. Among them, the top of the bottom forming female die 21 is arranged at the center of the bottom of the female die installation groove 12. The bottom of the bottom forming female die 21 passes through the female die plate 11 and is connected to the lower template 1 by bolts. Two collecting holes 22 are arranged at intervals on the top of the bottom forming female die 21 for collecting the blank after punching. The female die installation positioning hole 23 is opened at the bottom of the female die installation groove 12 around the bottom forming female die 21. The female die and the material positioning rod 24 is L-shaped, with a vertical rod at the bottom and a horizontal rod at the top. The vertical rod at the bottom of the female die and the material positioning rod 24 is clamped in the female die installation positioning hole 23. A side wall bending forming female die block 25 is sleeved on the top of the vertical rod of the female die and the material positioning rod 24. The bottom of the side wall bending forming female die block 25 is clamped at the four corners around the female die installation groove 12. The bottom of the side wall bending forming female die block 25 is connected to the female die plate 11 by bolts. The side of the female die formed by the bottom forming female die 21 and the side wall bending forming female die block 25 has a height greater than that of the other side. The height of the side wall bending forming female die block 25 close to the punch installation groove 32 is greater than the height of the other side wall bending forming female die block 25. When using the assembled female die, if there is a jam during blank taking, the side wall bending forming female die block 25 can be disassembled for blank taking.

[0048] The above-mentioned combined forming punch 4 is arranged at the center of the bottom of the punch template 31 through bolt connection. One side of the combined forming punch 4 is clamped in the punch mounting groove 32. The combined forming punch 4 includes: a groove forming punch rod 41, a punching punch rod 42, a first punch block 43, a second punch block 44 and a forming punch table 45. Among them, there are 3 groove forming punch rods 41. The 3 groove forming punch rods 41 are arranged at intervals at the center of the top of the punch template 31. One side of the groove forming punch rod 41 is arranged in the die mounting groove 12. The tops of the 3 groove forming punch rods 41 sequentially pass through the punch template 31 and the upper template 3. The bottom of the groove forming punch rod 41 is a quadrilateral punch head. The outer diameter of the middle rod body of the groove forming punch rod 41 is smaller than the outer diameter of the top circular clamping platform. The punching punch rod 42 is located directly above the aggregate hole 22. The punching punch rods 42 are arranged at the center of the top of the punch template 31. The punching punch rods 42 are located between adjacent groove forming punch rods 41. One side of the punching punch rod 42 is arranged in the die mounting groove 12. The tops of the punching punch rods 42 sequentially pass through the punch template 31 and the upper template 3. A chamfer is provided at the low end of the punch head at the bottom of the punching punch rod 42. The outer diameter of the middle rod body of the punching punch rod 42 is smaller than the outer diameter of the top circular clamping platform, which is convenient for installation. The first punch block 43 is clamped in the die mounting groove 12. The first punch block 43 is sleeved on the outside of the groove forming punch rod 41 and the punching punch rod 42. The bottom of the first punch block 43 is connected to the punch template 31 through a bolt. The punch block is divided into a first punch block 43 and a second punch block 44. Among them, the stamping depth of the first punch block 43 is deeper and the wear is faster than that of the second punch block 44. If wear occurs, only the first punch block 43 needs to be replaced to reduce the maintenance and replacement cost. The second punch block 44 is arranged on the top of the punch template 31 on one side of the first punch block 43. One side of the second punch block 44 is attached to the side of the first punch block 43. The bottom of the second punch block 44 is connected to the punch template 31 through a bolt. The second punch block 44 is sleeved on the outside of the groove forming punch rod 41 and the punching punch rod 42. Forming punch tables 45 are arranged on the front and rear sides of the second punch block 44. The bottom of the forming punch table 45 is engaged with the side wall bending forming die block 25 directly below.

[0049] The above-mentioned stop positioning module 5 is arranged between the lower template 1 and the upper template 3 through bolt connection. The stop positioning module 5 is located on the left and right sides of the concave template 11 and the convex template 31. The stop positioning module 5 includes: a guide block 51, a guide rod 53 and a stop column 54. Among them, the guide block 51 is arranged on the left and right sides of the convex template 31 and the concave template 11. The tops of the guide blocks 51 arranged on both sides of the convex template 31 are connected to the upper template 3 by bolts, and the bottoms of the guide blocks 51 arranged on both sides of the concave template 11 are connected to the lower template 1 by bolts. A guide groove 52 is arranged on one side of the guide block 51 away from the convex template 31 or the concave template 11. The guide rod 53 is clamped in the guide groove 52, and the guide rod 53 is connected to the guide blocks 51 arranged on both sides of the concave template 11 by bolts, playing a guiding role during mold closing, and technicians can directly observe whether there is a deviation in the positions of the lower template 1 and the upper template 3 before mold closing. There are two groups of stop columns 54 to prevent overshoot during mold closing. The two groups of stop columns 54 are sequentially arranged on the sides of the upper template 3 and the lower template 1 close to each other through bolt connection. The stop columns 54 are located around the convex template 31 or the concave template 11. The bottom ends of the stop columns 54 arranged on the upper template 3 are in contact with the stop columns 54 arranged at the top end of the lower template.

[0050] The above embodiments only illustratively explain the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A forming mold for a riser pipe on an automotive seat, characterized in that, Comprising: A lower template (1), in the center of the top end of the lower template (1), a concave template (11) is arranged through bolt connection, and in the center of the top of the concave template (11), a concave die installation groove (12) is arranged; A assembled concave die and a feeding positioning module (2), the assembled concave die and the feeding positioning module (2) are clamped in the concave die installation groove (12); An upper template (3), the upper template (3) is located directly above the assembled concave die and the feeding positioning module (2), on the bottom of the upper template (3), a convex template (31) is arranged through bolt connection, and on one side of the center of the top of the convex template (31), a punch installation groove (32) is arranged; A combined forming punch (4), the combined forming punch (4) is arranged through bolt connection at the center of the bottom of the convex template (31), and on one side of the combined forming punch (4), it is clamped in the punch installation groove (32); A stop positioning module (5), the stop positioning module (5) is arranged through bolt connection between the lower template (1) and the upper template (3), and the stop positioning module (5) is located on the left and right sides of the concave template (11) and the convex template (31).

2. The forming die for the riser pipe on an automotive seat according to claim 1, wherein The assembled concave die and the feeding positioning module (2) include: A bottom forming concave die (21), the top of the bottom forming concave die (21) is arranged at the center of the bottom of the concave die installation groove (12), the bottom of the bottom forming concave die (21) passes through the concave template (11) and is connected to the lower template (1) through bolts, and two collecting holes (22) are spaced apart on the top of the bottom forming concave die (21); Concave die installation positioning holes (23), the concave die installation positioning holes (23) are arranged at the bottom of the concave die installation groove (12) around the bottom forming concave die (21); A concave die and a material positioning rod (24), the concave die and the material positioning rod (24) is L-shaped with a vertical rod at the bottom and a horizontal rod at the top, the bottom of the vertical rod in the concave die and the material positioning rod (24) is clamped in the concave die installation positioning hole (23), a side wall bending forming concave module (25) is sleeved on the top of the vertical rod in the concave die and the material positioning rod (24), the bottom of the side wall bending forming concave module (25) is clamped at the four corners around the concave die installation groove (12), the bottom of the side wall bending forming concave module (25) is connected to the concave template (11) through bolts, one side of the side wall bending forming concave module (25) close to the center line of the concave die installation groove (12) is joined with the bottom forming concave die (21), and the top horizontal rod of the concave die and the material positioning rod (24) is connected to the side wall bending forming concave module (25) through bolts.

3. The forming die for the riser pipe on an automotive seat according to claim 2, characterized in that, One side height of the concave die formed by the bottom forming concave die (21) and the side wall bending forming concave module (25) is greater than the other side height, and the height of the side wall bending forming concave module (25) on the side close to the punch installation groove (32) is greater than the height of the other side wall bending forming concave module (25).

4. The forming die for the riser pipe on the vehicle seat according to claim 3, characterized in that, The combined forming punch (4) includes: Groove-forming punching rod (41), there are 3 groove-forming punching rods (41) provided, and the 3 groove-forming punching rods (41) are arranged at intervals in the middle of the top of the convex template (31). One side of the groove-forming punching rod (41) is arranged in the die mounting groove (12). The tops of the 3 groove-forming punching rods (41) sequentially pass through the convex template (31) and the upper template (3). The bottom of the groove-forming punching rod (41) is a quadrilateral punch head, and the outer diameter of the middle rod body of the groove-forming punching rod (41) is smaller than the outer diameter of the top circular clamping platform; Punching rod (42), the punching rod (42) is located directly above the aggregate hole (22). The punching rods (42) are arranged in the middle of the top of the convex template (31). The punching rod (42) is located between adjacent groove-forming punching rods (41). One side of the punching rod (42) is arranged in the die mounting groove (12). The top of the punching rod (42) sequentially passes through the convex template (31) and the upper template (3). A chamfer is provided at the lower end of the punch head at the bottom of the punching rod (42). The outer diameter of the middle rod body of the punching rod (42) is smaller than the outer diameter of the top circular clamping platform; First punch block (43), the first punch block (43) is clamped in the die mounting groove (12). The first punch block (43) is sleeved on the outside of the groove-forming punching rod (41) and the punching rod (42). The bottom of the first punch block (43) is connected to the convex template (31) by bolts; Second punch block (44), the second punch block (44) is arranged on the top of the convex template (31) on one side of the first punch block (43). One side surface of the second punch block (44) is attached to the side surface of the first punch block (43). The bottom of the second punch block (44) is connected to the convex template (31) by bolts. The second punch block (44) is sleeved on the outside of the groove-forming punching rod (41) and the punching rod (42). Forming punch platforms (45) are provided on the front and rear sides of the second punch block (44). The bottom of the forming punch platform (45) is engaged with the side wall bending forming die block (25) directly below; 5. The forming die for the riser pipe on the vehicle seat according to claim 4, characterized in that, The second punch block (44) and the forming punch platform (45) are an integral body.

6. The forming die for the riser pipe on the vehicle seat according to claim 5, characterized in that, The stop and positioning module (5) includes: Guide blocks (51), the guide blocks (51) are arranged on the left and right sides of the convex template (31) and the concave template (11). The tops of the guide blocks (51) arranged on both sides of the convex template (31) are connected to the upper template (3) by bolts. The bottoms of the guide blocks (51) arranged on both sides of the concave template (11) are connected to the lower template (1) by bolts. A guide groove (52) is provided on the side of the guide block (51) away from the convex template (31) or the concave template (11); Guide rods (53), the guide rods (53) are clamped in the guide grooves (52). The guide rods (53) are connected to the guide blocks (51) arranged on both sides of the concave template (11) by bolts; Stopping columns (54), there are two groups of the stopping columns (54), the two groups of the stopping columns (54) are sequentially arranged on the side close to each other of the upper template (3) and the lower template (1) through bolt connection, the stopping columns (54) are located around the convex template (31) or the concave template (11), and the bottom end of the stopping column (54) arranged on the upper template (3) contacts the stopping column (54) arranged at the top end of the lower template.

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