Nut welding spot precision forming cold heading device

Abstract

The utility model discloses a nut welding spot precision forming cold heading device which comprises a base, and a lower forming die assembly and an upper forming die assembly are fixed to the base. The lower forming die assembly comprises a bottom plate, a front row of lower forming die bases and a rear row of lower forming die bases are installed on the bottom plate, the lower forming die bases are detachable on the bottom plate, and the bottom plate can be driven by a driving mechanism to move front and back. The upper forming die assembly comprises a plurality of stand columns, a top plate is fixed to the tops of the stand columns, a cold heading air cylinder is fixed to the top plate, a connecting plate is fixed to the piston rod end of the cold heading air cylinder, a row of forming die heads are installed on the bottom face of the connecting plate, the forming die heads correspond to one row of the lower forming die base, and the forming die heads are detachably arranged on the connecting plate. Multiple nut welding spots can be subjected to cold heading forming machining at a time, and the efficiency is high; the two rows of lower forming die holders alternately carry out nut blank processing, so that the processing efficiency is further improved; the lower forming die base and the forming die head can be conveniently and rapidly assembled and disassembled while working stably, and precise cold heading machining of nut welding spots is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding nut processing, and particularly relates to a cold heading device for precision forming of welding points of nuts. Background Technique

[0002] The commonly used welding nut is the hexagonal welding nut, which is a hexagonal nut for welding. Its outer shape is hexagonal. One side is the same as that of a hexagonal nut, and the other side has three welding points and a boss. The three welding points are used for welding, and the boss is used for positioning.

[0003] When forming the welding points of the hexagonal welding nut, generally, a blank with a hole in the middle is directly placed in a single lower forming die, and then cold heading is directly formed by pressing down with an upper stamping die head. Since the wear of the die is relatively large during the cold heading forming process and the die is not easy to disassemble, during mass production and processing, considering the processing efficiency, the die is generally repaired and replaced only after being used for a long time. As a result, the worn die is still in use, resulting in poor forming accuracy of the nut welding points and low single processing efficiency. Summary of the Utility Model

[0004] The utility model provides a cold heading device for precision forming of welding points of nuts, which can perform cold heading forming processing on multiple nut welding points at one time with high efficiency; two rows of lower forming die seats alternately process nut blanks, further improving the processing efficiency; the lower forming die seats and the forming die heads can be conveniently installed and disassembled while working stably, which is beneficial to the precision cold heading processing of nut welding points, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a cold heading device for precision forming of welding points of nuts, including a base, on which a lower die assembly and an upper die assembly are fixed; the lower die assembly includes a bottom plate, on which there are two rows of lower forming die seats in the front and back. The lower forming die seats are detachable on the bottom plate, and the bottom plate can be driven to move back and forth by a driving mechanism; the upper die assembly includes multiple columns, at the top of which a top plate is fixed. A cold heading cylinder is fixed on the top plate, and a connecting plate is fixed at the piston rod end of the cold heading cylinder. A row of forming die heads is installed on the bottom surface of the connecting plate. The forming die heads correspond to one of the rows of the lower forming die seats, and the forming die heads are detachable on the connecting plate.

[0006] Preferably, the connecting plate and the column are slidably connected through linear bearings.

[0007] Preferably, the driving mechanism includes fixing plates on the front and back sides of the bottom plate. A lead screw is rotatably installed between the front and back fixing plates. The bottom plate is mounted on two guide rails in the front and back directions. A lead screw nut seat is fixed on the bottom surface of the bottom plate, and the lead screw nut seat is in screw drive connection with the lead screw. A servo motor is fixed on the rear fixing plate, and the servo motor is connected to the lead screw through a coupling.

[0008] Preferably, a positioning cylinder is installed on one side of the bottom plate. A positioning head is fixed to the piston rod of the positioning cylinder. The head end of the positioning head is of a conical structure. Two positioning holes corresponding to two rows of the lower forming die bases are provided on the side of the bottom plate.

[0009] Preferably, the lower forming die base can be detachably installed on the bottom plate through a positioning mechanism. The positioning mechanism includes an installation part provided at the bottom of the lower forming die base. A corresponding installation groove is provided on the bottom plate. A first positioning groove is provided on the installation part. A second positioning groove corresponding to the first positioning groove is provided in the installation groove. A compression spring and a positioning member are installed in the first positioning groove. The lower part of the positioning member is stuck in the second positioning groove under the extrusion of the compression spring. A through hole penetrating the second positioning groove is provided on the side of the bottom plate.

[0010] Preferably, the forming die head can be detachably installed on the connecting plate through the same positioning mechanism as that of the lower forming die base.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. Cold heading forming processing can be carried out on multiple nut welding points at one time, with high efficiency.

[0013] 2. The two rows of lower forming die bases alternately process nut blanks, further improving the processing efficiency.

[0014] 3. While the lower forming die base and the forming die head are working stably, they can be conveniently disassembled and assembled, which is beneficial to the precision cold heading processing of nut welding points. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view structural schematic diagram of the present utility model;

[0016] Figure 2 is the top view structural schematic diagram of the lower die assembly of the present utility model;

[0017] Figure 3 is the side view structural schematic diagram of the bottom plate of the present utility model;

[0018] Figure 4 is the side view sectional structural schematic diagram of the bottom plate and the lower forming die base of the present utility model;

[0019] Figure 5 is Figure 4 the enlarged structural schematic diagram at A of

[0020] In the figure: 1. Base; 2. Bottom plate; 3. Lower forming die base; 4. Column; 5. Top plate; 6. Cold heading cylinder; 7. Connecting plate; 8. Forming die head; 9. Linear bearing; 10. Fixed plate; 11. Lead screw; 12. Guide rail; 13. Lead screw nut seat; 14. Servo motor; 15. Positioning cylinder; 16. Positioning head; 17. Positioning hole; 18. Installation part; 19. First positioning groove; 20. Second positioning groove; 21. Compression spring; 22. Positioning part; 23. Through hole. Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-5 , the present invention provides a cold heading device for precision forming of nut solder joints, including a base 1, on which a lower die assembly and an upper die assembly are fixed; the lower die assembly includes a bottom plate 2, on which there are two rows of lower forming die bases 3 in the front and back. The lower forming die base 3 is detachable on the bottom plate 2, and the bottom plate 2 can be driven to move back and forth by a driving mechanism; the upper die assembly includes multiple columns 4, the top of the column 4 is fixed with a top plate 5, and a cold heading cylinder 6 is fixed on the top plate 5. The piston rod end of the cold heading cylinder 6 is fixed with a connecting plate 7, and a row of forming die heads 8 are installed on the bottom surface of the connecting plate 7. The forming die head 8 corresponds to one row of the lower forming die bases 3, and the forming die head 8 is detachable on the connecting plate 7; during use, nut blanks are placed into one row of the lower forming die bases 3 at a time, and then the bottom plate 2 is driven to move back and forth by the driving mechanism, so as to drive one row of the lower forming die bases 3 and the nut blanks to reach below the forming die heads 8. Control the cold heading cylinder 6 to drive the connecting plate 7 to descend, further drive the forming die heads 8 to descend to cold heading and form the nut solder joints. During this period, nut blanks can be placed in the other row of the lower forming die bases 3. After processing, the cold heading cylinder 6 drives the connecting plate 7 and the forming die heads 8 to rise and reset, and the driving mechanism drives the bottom plate 2 to move, so that the other row of the lower forming die bases 3 moves to below the forming die heads 8, then the cold heading cylinder 6 controls the forming die heads 8 to repeat the previous actions to form the solder joints of the nut blanks. During this period, the processed nuts in the other row can be taken out, and new nuts to be processed can be placed. The batch cold heading processing of nut solder joints is carried out in a cycle; at the same time, the lower forming die bases 3 and the forming die heads 8 can be conveniently installed and disassembled while working stably, which is beneficial to the precision cold heading processing of nut solder joints.

[0023] Specifically, the connecting plate 7 is slidably connected to the column 4 through a linear bearing 9; in this embodiment, the friction between the cold heading cylinder 6 driving the connecting plate 7 to move up and down and the column 4 is reduced, improving the overall cold heading processing accuracy.

[0024] Specifically, the driving mechanism includes fixing plates 10 located on the front and rear sides of the bottom plate 2. A lead screw 11 is rotatably installed between the front and rear fixing plates 10. The bottom plate 2 is mounted on two guide rails 12 running in the front and rear directions. A lead screw nut seat 13 is fixed to the bottom surface of the bottom plate 2. The lead screw nut seat 13 is in screw drive connection with the lead screw 11. A servo motor 14 is fixed to the rear fixing plate 10. The servo motor 14 is connected to the lead screw 11 through a coupling; in this embodiment, the servo motor 14 drives the lead screw 11 to rotate, and then cooperates with the lead screw nut seat 13 to drive the fixing plate 10 to move back and forth, realizing the alternating processing of two rows of lower forming die seats 3.

[0025] Specifically, a positioning cylinder 15 is installed on one side of the bottom plate 2. A positioning head 16 is fixed to the piston rod of the positioning cylinder 15. The head end of the positioning head 16 is of a conical structure. Two positioning holes 17 corresponding to two rows of the lower forming die seats 3 are provided on the side of the bottom plate 2; in this embodiment, when the two rows of lower forming die seats 3 are alternately processed, the positioning head 16 is driven by the positioning cylinder 15 to alternately insert into different positioning holes 17 to realize the positioning of the bottom plate 2 after alternation, further improving the processing accuracy.

[0026] Specifically, the lower forming die seat 3 can be detachably installed on the bottom plate 2 through a positioning mechanism. The positioning mechanism includes an installation part 18 provided at the bottom of the lower forming die seat 3. A corresponding installation groove is provided on the bottom plate 2. A first positioning groove 19 is provided on the installation part 18. A second positioning groove 20 corresponding to the first positioning groove 19 is provided in the installation groove. A compression spring 21 and a positioning member 22 are installed in the first positioning groove 19. The lower part of the positioning member 22 is stuck in the second positioning groove 20 under the extrusion of the compression spring 21. A through hole 23 penetrating the second positioning groove 20 is provided on the side of the bottom plate 2; in this embodiment, by inserting a rod through the through hole 23, the positioning member 22 can be completely pushed into the first positioning groove 19, and then the lower forming die seat 3 can be directly taken out for replacement. When installing a new lower forming die seat 3, the positioning member 22 is fully pressed in the first positioning groove 19, and then the installation part 18 of the lower forming die seat 3 is installed in the installation groove. After in place, the positioning member 22 is partially stuck in the second positioning groove 20 under the extrusion of the compression spring 21, locking the installation part 18.

[0027] Specifically, the forming die head 8 can be detachably installed on the connecting plate 7 through the same positioning mechanism as the lower forming die seat 3; in this embodiment, the lower forming die seat 3 and the forming die head 8 can be conveniently detached and installed while working stably, which is beneficial to the precision cold heading processing of nut solder joints.

[0028] For the convenience of understanding the above technical solutions of the present utility model, the working principle or operation mode of the present utility model in the actual process will be described in detail below.

[0029] Working principle: During use, the nut blanks are placed into a row of lower forming die bases 3 at one time, and then the driving mechanism drives the bottom plate 2 to move back and forth, so as to drive a row of lower forming die bases 3 and the nut blanks to reach below the forming die head 8. Control the cold heading cylinder 6 to drive the connecting plate 7 to descend, further drive the forming die head 8 to descend to cooperate with the lower forming die base 3 to cold heading and form the nut solder joints. During this period, the nut blanks of another row of lower forming die bases 3 can be placed. After the processing is completed, the cold heading cylinder 6 drives the connecting plate 7 and the forming die head 8 to rise and reset. The driving mechanism drives the bottom plate 2 to move, so that another row of lower forming die bases 3 moves to below the forming die head 8. Then the cold heading cylinder 6 controls the forming die head 8 to repeat the previous action to form the solder joints of the nut blanks. During this period, the processed nuts of another row can be taken out, and new nut blanks to be processed can be placed, and the batch cold heading processing of the nut solder joints is carried out in a cycle.

[0030] At the same time, by inserting a rod through the through hole 23, the positioning member 22 can be completely pushed into the first positioning groove 19, and then the lower forming die base 3 can be directly taken out for replacement. When installing a new lower forming die base 3, the positioning member 22 is fully pressed into the first positioning groove 19, and then the installation part 18 of the lower forming die base 3 is installed in the installation groove. After in place, the positioning member 22 is partially stuck in the second positioning groove 20 under the extrusion of the compression spring 21, locking the installation part 18. The forming die head 8 can be installed and disassembled by the same principle. The lower forming die base 3 and the forming die head 8 can be conveniently installed and disassembled while working stably, which is beneficial to the precision cold heading processing of the nut solder joints.

[0031] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A cold heading device for precision forming of solder joints of a nut, comprising a base (1), characterized in that, A lower die assembly and an upper die assembly are fixed on the base (1); the lower die assembly includes a bottom plate (2), on which two rows of lower forming die bases (3) are installed front and back. The lower forming die bases (3) are detachable on the bottom plate (2), and the bottom plate (2) can be driven to move back and forth by a driving mechanism; the upper die assembly includes a plurality of columns (4), at the top of which a top plate (5) is fixed. A cold heading cylinder (6) is fixed on the top plate (5), and a connecting plate (7) is fixed at the piston rod end of the cold heading cylinder (6). A row of forming die heads (8) is installed on the bottom surface of the connecting plate (7). The forming die heads (8) correspond to one of the two rows of the lower forming die bases (3), and the forming die heads (8) are detachable on the connecting plate (7).

2. The cold heading device for precise forming of solder joints of a nut according to claim 1, wherein, The connecting plate (7) is slidably connected with the column (4) through a linear bearing (9).

3. The cold heading device for precision forming of solder joints of a nut according to claim 1, wherein, The driving mechanism includes fixing plates (10) located on the front and rear sides of the bottom plate (2). A lead screw (11) is rotatably installed between the front and rear fixing plates (10). The bottom plate (2) is mounted on two guide rails (12) running front and back. A lead screw nut seat (13) is fixed on the bottom surface of the bottom plate (2), and the lead screw nut seat (13) is in screw drive connection with the lead screw (11). A servo motor (14) is fixed on the rear fixing plate (10), and the servo motor (14) is connected with the lead screw (11) through a coupling.

4. A cold heading device for precision forming of solder joints of a nut according to claim 1, characterized in that, A positioning cylinder (15) is installed on one side of the bottom plate (2). A positioning head (16) is fixed on the piston rod of the positioning cylinder (15). The head end of the positioning head (16) is of a conical structure. Two positioning holes (17) corresponding to the two rows of the lower forming die bases (3) are provided on the side of the bottom plate (2).

5. The cold heading device for precision forming of solder joints of a nut according to claim 1, characterized in that, The lower forming die base (3) can be detachably installed and disassembled on the bottom plate (2) through a positioning mechanism. The positioning mechanism includes an installation part (18) provided at the bottom of the lower forming die base (3). A corresponding installation groove is provided on the bottom plate (2). A first positioning groove (19) is provided on the installation part (18), and a second positioning groove (20) corresponding to the first positioning groove (19) is provided in the installation groove. A compression spring (21) and a positioning part (22) are installed in the first positioning groove (19). The lower part of the positioning part (22) is stuck in the second positioning groove (20) under the extrusion of the compression spring (21). A through hole (23) penetrating the second positioning groove (20) is provided on the side of the bottom plate (2).

6. The cold heading device for precision forming of solder joints of a nut according to claim 5, characterized in that The forming die head (8) can be detachably installed and disassembled on the connecting plate (7) through the same positioning mechanism as that of the lower forming die base (3).

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