A precision small-hole punching die applicable to special-shaped and complex curved surface pipe fittings

Abstract

The present invention discloses a precision small-hole punching die applicable to special-shaped complex curved surface pipe fittings, which relates to the technical field of precision small-hole punching for special-shaped complex curved surface pipe fittings. It includes an upper template, a concave die assembly and a base. The upper template is connected to the base through guide columns. The upper template is provided with a pressing plate and a punch fixing plate. The punch fixing plate is provided with a punch. One end of the base is provided with a concave die fixing seat. The concave die fixing seat is provided with a groove. The concave die assembly is arranged below the punch. The concave die assembly includes a concave die body and a connecting body that cooperates with the groove. The concave die body includes an upper movable block, a left baffle and a side movable block. The connecting body is respectively movably connected to the upper movable block and the side movable block. The left side of the upper movable block is fixedly connected to the left baffle. The side movable block and the left baffle are connected by a rectangular spring. The present invention is applicable to punching operations on the curved surface of special-shaped complex curved surface pipe fittings, has a simple structure, relatively low cost, and functions such as anti-misalignment and high precision.

Description

Technical Field

[0001] The present invention relates to the technical field of precision small hole punching for special-shaped complex curved surface pipe fittings, and specifically to a precision small hole punching die suitable for special-shaped complex curved surface pipe fittings. Background Art

[0002] For a long time, manufacturing high-precision automotive parts requires complex process equipment. However, the processing technology for small holes on the curved surfaces of special-shaped complex curved surface pipe fittings has always been a bottleneck in the automotive part manufacturing process, affecting the processing quality and efficiency of products.

[0003] Currently, advanced laser cutting technology is used to cut φ6mm round holes in special-shaped complex curved surface pipe fittings. Due to the complex curved surface of the product and the too small hole diameter, first, the starting point of the laser beam cannot be controlled (the starting point refers to when using a laser cutting machine for sheet metal processing, the laser beam hits the metal sheet and forms a concave pit. With the ejection of air flow, the material forms a hole, which is the so-called laser cutting piercing point, that is, the starting point of processing). Second, the cutting posture of the manipulator on the curved surface cannot completely coincide with the normal direction of the curved surface. Therefore, it is very easy to cause overburning and out-of-roundness of the round holes cut in the product (overburning means that during laser cutting processing, due to the high temperature value of the inner side material of the small hole, slag hanging appears on the inner side). Based on this, a precision small hole punching die for such products is designed, which ensures the processing quality of the round holes in the product and improves the forming efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a precision small hole punching die suitable for special-shaped complex curved surface pipe fittings.

[0005] The object of the present invention is achieved through the following technical solutions: A precision small-hole punching die suitable for special-shaped complex curved surface pipe fittings. The die includes an upper template, a concave die assembly, and a base. The upper template is connected to the base through guide columns. The upper template is provided with a pressure plate and a punch fixing plate. The punch fixing plate is arranged below the pressure plate and fixedly connected to the pressure plate. The punch fixing plate is provided with a punch. One end of the base is provided with a concave die fixing seat. The concave die fixing seat is provided with a groove. The concave die assembly is arranged below the punch. The concave die assembly provides rigid support for the punch to prevent the punch from losing roundness or the center line from shifting due to its poor rigidity on the holes of the special-shaped complex curved surface pipe (if the concave die assembly cannot closely fit the inner surface of the special-shaped complex curved surface pipe, the concave die assembly will be suspended during punching, and the special-shaped complex curved surface pipe will sink under the action of the punch). The concave die assembly includes a concave die body and a connecting body that matches the groove. The concave die body includes an upper movable block, a left baffle, and a side movable block. The connecting body is respectively movably connected to the upper movable block and the side movable block. The upper movable block prevents over-positioning of the upper plane of the concave die assembly due to the surface change of the special-shaped complex curved surface pipe (that is, the concave die assembly around the hole cannot closely fit the special-shaped complex curved surface pipe). The left side of the upper movable block is fixedly connected to the left baffle. The side movable block is connected to the left baffle through a rectangular spring, and the rectangular spring facilitates the reset of the side movable block.

[0006] Preferably, the upper movable block is provided with a through waste hole. The punch is arranged directly above the waste hole. The upper movable block is also provided with a through waste channel, and the waste channel is connected to the waste hole. After punching, the punched waste falls through the waste hole and waste channel of the concave die assembly, which is convenient for collection and cleaning.

[0007] Further, a first positioning block is arranged at the other end of the base. A second positioning block is arranged on one side of the concave die fixing seat. The second positioning block is provided with a positioning pin, which is convenient for positioning the special-shaped complex curved surface pipe.

[0008] Preferably, the concave die fixing seat is also provided with a pressure sensor for controlling the punching operation of the punching machine.

[0009] Further, the concave die fixing seat is also provided with a positioning plate. The positioning plate is sleeved on the connecting body. The positioning plate is provided with a positioning block, and the positioning block is arranged above the concave die body for positioning the placement position of the special-shaped complex curved surface pipe.

[0010] Preferably, the punch fixing plate is fixedly connected to the pressure plate, and the second positioning block is fixedly connected to the base through hex socket head cap screws. The outside of the screw head of the hex socket head cap screw is round, and the middle is a concave hexagon. Hex socket head cap screws are commonly used in machinery and mainly have the advantages of being convenient for fastening, disassembly, and not easily slipping.

[0011] Further, a die handle is provided at the top of the upper template, and a guide bushing is sleeved on the guide post to facilitate the protection of the guide post.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. By closely fitting the inner surface of the special-shaped complex curved tube with the concave die assembly, the present invention solves the problem of poor processing quality in the laser cutting process, including overburning, inability to adjust the starting point, and unstable cutting quality caused by the curved surface of the semi-finished product during processing.

[0014] 2. Through the pressure sensor, the present invention can effectively prevent the punching deviation caused by the improper placement of the semi-finished product, and overcomes the drawback of the hole center deviation when the concave part of the product is more than 50% of the circumference of the round hole of the entire punching during non-concave die punching.

[0015] 3. The mold of the present invention has high efficiency and a simple structure, and is a precision punching mold. Description of the Drawings

[0016] Figure 1 is the structural schematic diagram of the present invention;

[0017] Figure 2 is Figure 1 the left view of

[0018] Figure 3 is Figure 1 the sectional structural schematic diagram of

[0019] Figure 4 is the structural schematic of the concave die assembly of the present invention Figure 1 ;

[0020] Figure 5 is the structural schematic of the concave die assembly of the present invention Figure 2 ;

[0021] Figure 6 is the structural schematic diagram of the concave die fixing seat of the present invention;

[0022] Figure 7 is Figure 6 the left view of

[0023] Figure 8 is the structural schematic diagram of the guide post of the present invention;

[0024] In the figure: 1 - connecting body, 2 - base, 3 - side movable block, 6 - guide pillar, 7 - pressure sensor, 8 - female die fixing seat, 9 - positioning plate, 10 - female die assembly, 11 - positioning stop block, 12 - die shank, 13 - punch fixing plate, 14 - pressing plate, 15 - upper template, 16 - punch, 17 - left baffle, 18 - waste hole, 19 - waste channel, 20 - groove, 21 - female die body, 22 - guide bushing, 23 - upper movable block, 24 - first positioning block, 25 - second positioning block, 26 - positioning pin. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] As Figures 1-8As shown in the figure, a precision small-hole punching die for special-shaped complex curved surface pipe fittings is provided. The die includes an upper template 15, a concave die assembly 10, and a base 2. The upper template 15 is connected to the base 2 through guide columns 6. The upper template 15 is provided with a pressing plate 14 and a punch fixing plate 13. The punch fixing plate 13 is arranged below the pressing plate 14 and fixedly connected to the pressing plate 14. The punch fixing plate 13 is provided with a punch 16. One end of the base 2 is provided with a concave die fixing seat 8. The concave die fixing seat 8 is provided with a groove 20. The concave die assembly 10 is arranged below the punch 16. The concave die assembly 10 includes a concave die body 21 and a connecting body 1 that cooperates with the groove 20. The concave die body 21 includes an upper movable block 23, a left baffle 17, and a side movable block 3. The connecting body 1 is movably connected to the upper movable block 23 and the side movable block 3 respectively. The left side of the upper movable block 23 is fixedly connected to the left baffle 17. The side movable block 3 and the left baffle 17 are connected by a rectangular spring. When the upper template 15 is opened, the material is placed (that is, the end of the special-shaped complex curved surface pipe that needs to be punched is sleeved on the concave die body 21). At the same time, the pipe surface on the side that needs to be punched is placed between the concave die body 21 and the punch 16. The concave die assembly 10 adopts a combined floating structure. The upper movable block 23 moves downward under the influence of the gravity of the special-shaped complex curved surface pipe. The side movable block 3 is squeezed by the pipe body of the special-shaped complex curved surface pipe and moves in the direction of the left baffle 17, causing the curved surface of the concave die body 21 to change and fitting the inner curved surface of the special-shaped complex curved surface pipe to the greatest extent. This not only avoids the appearance of flanging burrs during punching but also prevents the curved surface of the special-shaped complex curved surface pipe from being deformed due to stamping. At the same time, it improves the positioning accuracy caused by the surface fluctuation of the special-shaped complex curved surface pipe. The punching press starts to work, and the pressing plate 14 is controlled to move downward. The punch 16 is driven to press against the special-shaped complex curved surface pipe for punching, forming a φ6mm hole. After punching, the pressing plate 14 drives the punch 16 to reset, and the processed product is taken out. At the same time, the upper movable block 23 and the side movable block 3 are reset, waiting for the next feeding.

[0028] The upper movable block 23 is provided with a through waste hole 18. The punch 16 is arranged directly above the waste hole 18. The upper movable block 23 is also provided with a through waste channel 19. The waste channel 19 is connected to the waste hole 18. After punching, the punched waste falls through the waste hole 18 and the waste channel 19 of the concave die assembly 10, which is convenient for collection and cleaning.

[0029] At the other end of the base 2, a first positioning block 24 is provided. On one side of the female die fixing seat 8, a second positioning block 25 is provided. The second positioning block 25 is provided with a positioning pin 26. The female die fixing seat 8 is further provided with a pressure sensor 7. The female die fixing seat 8 is further provided with a positioning plate 9. The positioning plate 9 is sleeved on the connecting body 1. The positioning plate 9 is provided with a positioning stop block 11. The positioning stop block 11 is arranged above the female die body 21. When putting in the material, after the special-shaped complex curved surface pipe touches the positioning stop block 11, it is put down. The special-shaped complex curved surface pipe adopts a right reference hole and V-shaped positioning (that is, positioned within the range of the positioning pin 26, the first positioning block 24 and the second positioning block 25). At this time, the pressure sensor 7 emits a signal, and the punching machine performs the next operation. If the special-shaped complex curved surface pipe is not within the range of the positioning pin 26, the first positioning block 24 and the second positioning block 25, the pressure sensor 7 does not emit a signal, and the punching machine cannot perform the punching operation.

[0030] The punch fixing plate 13 and the pressure plate 14, and the second positioning block 25 and the base 2 are fixedly connected by hexagon socket head cap screws. A die shank 12 is arranged at the top of the upper template 15. The guide pillar 6 is sleeved with a guide bush 22. The guide bush 22 is used to protect the guide pillar 6.

[0031] The quality statistics table of the prior art processing and the processing of this die is shown in Table 1. After using this die for processing, the probabilities of hole out-of-roundness, overburning on the hole surface, and burrs are greatly reduced, and the hole qualification rate is significantly improved (the qualification rate after the prior art processing is 84%-92%, and the qualification rate after the processing of this die is 99%-100%).

[0032]

[0033] Table 1 Quality Statistics Table

[0034] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as an exclusion of other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A precision small-hole punching die applicable to special-shaped complex curved surface pipe fittings, characterized in that: It includes an upper template (15), a female die assembly (10) and a base (2). The upper template (15) is connected to the base (2) by guide columns (6). The upper template (15) is provided with a pressing plate (14) and a punch fixing plate (13). The punch fixing plate (13) is arranged below the pressing plate (14) and fixedly connected to the pressing plate (14). The punch fixing plate (13) is provided with a punch (16). One end of the base (2) is provided with a female die fixing seat (8). The female die fixing seat (8) is provided with a groove (20). The female die assembly (10) is arranged below the punch (16). The female die assembly (10) adopts a combined floating structure. The female die assembly (10) includes a female die body (21) and a connecting body (1) that cooperates with the groove (20). The female die body (21) includes an upper movable block (23), a left baffle (17) and a side movable block (3). The connecting body (1) is movably connected to the upper movable block (23) and the side movable block (3) respectively. The left side of the upper movable block (23) is fixedly connected to the left baffle (17). The side movable block (3) and the left baffle (17) are connected by a rectangular spring.

2. The precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 1, wherein: The upper movable block (23) is provided with a through waste hole (18). The punch (16) is arranged directly above the waste hole (18).

3. The precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 2, wherein: The upper movable block (23) is further provided with a through waste channel (19). The waste channel (19) is connected to the waste hole (18).

4. The precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 1, wherein: The other end of the base (2) is provided with a first positioning block (24). One side of the female die fixing seat (8) is provided with a second positioning block (25). The second positioning block (25) is provided with a positioning pin (26).

5. The precision small hole punching die for special-shaped complex curved surface pipe fittings according to claim 4, characterized in that: The female die fixing seat (8) is further provided with a pressure sensor (7).

6. The precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 5, wherein: The female die fixing seat (8) is further provided with a positioning plate (9). The positioning plate (9) is sleeved on the connecting body (1).

7. A precision small hole punching die for special-shaped complex curved surface pipe fittings according to claim 6, characterized in that: The positioning plate (9) is provided with a positioning block (11). The positioning block (11) is arranged above the female die body (21).

8. A precision small hole punching die for special-shaped complex curved surface pipe fittings according to claim 4, characterized in that: The punch fixing plate (13) and the pressing plate (14), the second positioning block (25) and the base (2) are all fixedly connected by hexagon socket head cap screws.

9. The precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 1, wherein: The top of the upper template (15) is provided with a shank (12).

10. A precision small-hole punching die for special-shaped complex curved surface pipe fittings according to claim 1, characterized in that: The guide columns (6) are sleeved with guide bushes (22).

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