Novel end face point-torsion die for press riveting nut

Abstract

The utility model relates to the field of hydraulic punch press stamping forming, in particular to a novel press riveting nut end face torsion point die, including the lower die plate (1), the lower die plate (1) on sliding fit has the upper die plate (2), be equipped with at least one spacing contour block (3) between the upper die plate (2) with the lower die plate (1). The utility model structure design is simple, only needs a few changes to can significantly simplify installation debugging process, reduces operation difficulty and personnel burden, effectively promotes production efficiency. Meanwhile, the special structure design of the application can not only accurately guarantee the depth size and position precision of the nut end face torsion point, improve the product qualified rate, but also can significantly reduce the production cost, enhance the comprehensive economic benefit of the product, have greater market promotion value.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic press stamping, and in particular to a novel die for the end face twist point of a rivet nut. Background Technology

[0002] Currently, many domestic manufacturers use large-tonnage stamping presses (such as 80-ton presses) with simple stamping dies, or small benchtop hydraulic presses (such as 5-ton / 10-ton presses) with split dies for twist point pressing. Both methods heavily rely on the press stroke to control the twist point depth. However, the stroke control of existing technologies is inherently inaccurate and fluctuates greatly; coupled with the difficulty in ensuring absolute accuracy and verticality of the position each time the die is placed and adjusted manually, this leads to two key problems: firstly, the twist point depth is inconsistent between batches of products; and secondly, the twist point position is prone to skewness.

[0003] The direct consequence of these two process defects is a very large fluctuation range in the torque value of the nut. This is because even slight differences in the depth and position of the torque point directly determine the torque performance. Unstable torque directly increases the defect rate, causing significant quality and economic losses.

[0004] Therefore, those skilled in the art are dedicated to developing a new type of riveting nut end face twist point mold that is simple to operate and has high riveting accuracy. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide a new type of mold for the twist point of the end face of the press-fit nut.

[0006] To achieve the above objectives, this utility model provides a novel die for the twist point of the end face of a press-fit nut, including a lower template, an upper template that is slidably fitted on the lower template, and at least one limiting height block between the upper template and the lower template.

[0007] Preferably, two limiting height blocks are provided, with one end of each limiting height block connected to the lower template and the other end extending in a direction close to the upper template.

[0008] Preferably, the lower template is provided with a first guide hole, a precision guide sleeve is provided in the first guide hole, one end of the precision guide sleeve is provided with a skirt, and the bottom of the skirt abuts against the top of the lower template.

[0009] Preferably, the upper template is provided with an oil groove guide post, which slides in conjunction with the first guide hole.

[0010] Preferably, the upper mold plate includes an upper mold pad and an upper mold clamping plate. The upper mold clamping plate has a receiving hole for the oil groove guide post to pass through. The receiving hole is provided with a relief step. The oil groove guide post is provided with a snap-fit ​​protrusion that cooperates with the relief step.

[0011] Preferably, the lower mold plate is provided with a lower mold base on the side away from the upper mold plate, and the lower mold base includes a first base plate and a second base plate spaced apart, with at least one support plate between the first base plate and the second base plate.

[0012] Preferably, the first base plate is provided with a second guide hole that coincides with the axis of the first guide hole, and the oil groove guide post can slide freely within the first guide hole and the second guide hole.

[0013] Preferably, the oil tank guide post is provided with several annular grooves at intervals.

[0014] Preferably, the upper template is provided with an upper mold joint on the side away from the lower template, and the upper mold joint is connected to the main shaft of the stamping machine.

[0015] Preferably, the upper template is further provided with an integral pressing blade block on the side near the lower template, and the lower template is provided with a lower mold core that cooperates with the integral pressing blade block.

[0016] The beneficial effects of this utility model are as follows: The structure of this utility model is simple, requiring only minor modifications to significantly simplify the installation and debugging process, reduce operational difficulty and personnel burden, and effectively improve production efficiency. Furthermore, the special structural design of this application not only accurately guarantees the depth and positional precision of the torsion point on the nut end face in riveting products, improving product qualification rate, but also significantly reduces production costs, enhances the overall economic benefits of the product, and has significant market promotion value. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0018] Figure 2 This is a side view of a specific embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of AA.

[0020] Figure 4 yes Figure 3 A magnified structural diagram at point B in the middle.

[0021] Figure 5 This is a schematic diagram of the assembly of the upper mold pad and the upper mold clamping plate in a specific embodiment of this utility model.

[0022] Figure 6 This is a schematic diagram of the upper mold clamping plate in a specific embodiment of this utility model.

[0023] Figure 7This is an assembly diagram of the lower template and the lower mold base in a specific embodiment of this utility model.

[0024] 1. Lower mold plate; 11. First guide hole; 12. Precision guide sleeve; 12a. Skirt; 13. Lower mold base; 13a. First base plate; 13a1. Second guide hole; 13b. Second base plate; 13c. Support plate; 14. Lower mold core; 2. Upper mold plate; 21. Oil groove guide post; 21a. Snap-fit ​​protrusion; 21b. Annular groove; 22. Upper mold pad; 23. Upper mold clamping plate; 23a. Accommodation hole; 23a1. Clearance step; 24. Upper mold joint; 25. Integral pressure point knife block; 3. Limiting height block. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] like Figure 1-4 As shown, a novel die for the end face twist point of a press-fit nut includes a lower template 1, an upper template 2 slidably fitted on the lower template 1, and at least one limiting height block 3 between the upper template 2 and the lower template 1. Specifically, the lower template 1 serves as the mounting base and has a first guide hole 11. In this embodiment, two first guide holes 11 are provided, located at opposite ends of the lower template 1. Precision guide sleeves 12 are provided within each of the two first guide holes 11, serving a precise positioning function. Further, one end of the precision guide sleeve 12 has a skirt 12a, the bottom of which abuts against the top of the lower template 1, fixing the precision guide sleeve 12 within the first guide hole 11. Even further, the inner wall of the precision guide sleeve 12 is provided with several oil grooves. These oil grooves reduce the risk of wear caused by direct contact with foreign objects when accommodating impurities or contaminants, extending the service life of the mating parts.

[0027] like Figure 7As shown, a lower mold base 13 is provided on the side of the lower mold 1 away from the upper mold 2, providing an installation foundation for the lower mold 1. Specifically, the lower mold base 13 includes a first base plate 13a and a second base plate 13b spaced apart, with at least one support plate 13c between the first base plate 13a and the second base plate 13b. In this embodiment, three support plates 13c are provided; in other embodiments, other numbers of support plates 13c may be provided as needed. Further, a second guide hole 13a1 is provided on the first base plate 13a, coinciding with the axis of the first guide hole 11, allowing the oil groove guide post 21 to slide freely within the first guide hole 11 and the second guide hole 13a1. Furthermore, the inner diameter of the second guide hole 13a1 is larger than the inner diameter of the precision guide sleeve 12 but smaller than the inner diameter of the first guide hole 11. This design ensures that the oil groove guide post 21 only contacts the inner wall of the precision guide sleeve 12 when sliding within the first guide hole 11 and the second guide hole 13a1, thereby effectively reducing the frictional force when the oil groove guide post 21 slides.

[0028] like Figure 5-6 As shown, the upper mold plate 2 is provided with an oil groove guide post 21, which slides in conjunction with the first guide hole 11 and the second guide hole 13a1. Specifically, the upper mold plate 2 includes an upper mold pad 22 and an upper mold clamping plate 23. In this embodiment, both the upper mold pad 22 and the upper mold clamping plate 23 are flat. The upper mold pad 22 is located above the upper mold clamping plate 23. The upper mold clamping plate 23 has a receiving hole 23a for accommodating the oil groove guide post 21. A clearance step 23a1 is provided in the receiving hole 23a. The oil groove guide post 21 is provided with a snap-fit ​​protrusion 21a that cooperates with the clearance step 23a1. The side wall of the snap-fit ​​protrusion 21a abuts against the clearance step 23a1. The snap-fit ​​cooperation between the clearance step 23a1 and the snap-fit ​​protrusion 21a fixes the oil groove guide post 21, preventing it from sliding out of the receiving hole 23a. Furthermore, the oil groove guide post 21 is provided with several annular grooves 21b at intervals. The annular grooves 21b serve to accommodate impurities and wear debris. At the same time, lubricating oil / grease can be stored in the annular grooves 21b. When the oil groove guide post 21 reciprocates, the lubricating oil is evenly carried to the contact surface, maintaining the oil film thickness and reducing dry friction.

[0029] In this embodiment, two limiting height blocks 3 are provided. In other embodiments, other numbers of limiting height blocks 3 may be provided as needed. One end of each limiting height block 3 is connected to the lower template 1, and the other end extends along the direction close to the upper template 2. By setting the limiting height blocks 3, the movement stroke of the upper template 2 is limited, thereby ensuring that the riveting accuracy is in place.

[0030] In this embodiment, the upper template 2 is provided with an upper die connector 24 on the side away from the lower template 1. The upper die connector 24 is connected to the main shaft of the stamping machine (not shown in the figure) for power transmission. Furthermore, the upper template 2 is also provided with an integral pressing blade block 25 on the side near the lower template 1. The integral pressing blade block 25 is used to press the required working surface. Even further, the lower template 1 is provided with a lower die core 14 that cooperates with the integral pressing blade block 25. In specific implementation, the lower die core 14 can be made into a square, with holes drilled along the diagonal to prevent assembly errors. By setting the lower die core 14, a base for placing the workpiece is provided, preventing the torsion point position from shifting.

[0031] In use, place the mold described in this application on the worktable of a 5T or 10T benchtop hydraulic punch press, align the upper mold connector 24 with the center hole of the punch press spindle, and install and fix it. Then adjust the punch press stroke (it must be ensured that the oil groove guide post 21 penetrates the upper template 2 and the lower template 1 by more than 10mm, and that it does not come out of the precision guide sleeve 12). After adjusting the punch press stroke, use a pressure block or bolts to fix the lower mold base 13 on the worktable surface (not shown in the figure), and then start the equipment. At this time, place the workpiece to be processed into the lower mold core 14, press the start button of the punch press, and the punch press spindle pushes the upper template 2 and the oil groove guide post 21 to move synchronously through the upper mold connector 24. The oil groove guide post 21 slides in the precision guide sleeve 12 until the bottom of the lower template 1 abuts against the end of the limit equalization block 3. At this time, under the action of the limit equalization block 3, the upper template 2 stops moving, and the integral pressing point block 25 also completes the pressing and riveting operation on the workpiece to be processed in the lower mold core 14.

[0032] This application features a simple structural design that requires only minor modifications to significantly simplify the installation and commissioning process, reduce operational difficulty and personnel burden, and effectively improve production efficiency. Furthermore, the unique structural design of this application, when used in press-fit products, not only precisely ensures the depth and positional accuracy of the nut end face torsion point, improving product qualification rate, but also significantly reduces production costs, enhances the overall economic benefits of the product, and possesses significant market promotion value.

[0033] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A novel die for the twist point on the end face of a press-fit nut, characterized in that: It includes a lower template (1), an upper template (2) is slidably fitted on the lower template (1), and at least one limiting height block (3) is provided between the upper template (2) and the lower template (1).

2. The novel press-fit nut end face twist point mold as described in claim 1, characterized in that: The limiting height block (3) is set to two, with one end of the two limiting height blocks (3) connected to the lower template (1), and the other end extending in the direction close to the upper template (2).

3. The novel press-fit nut end face twist point mold as described in claim 1, characterized in that: The lower template (1) is provided with a first guide hole (11), and a precision guide sleeve (12) is provided in the first guide hole (11). One end of the precision guide sleeve (12) is provided with a skirt (12a), and the bottom of the skirt (12a) abuts against the top of the lower template (1).

4. The novel press-fit nut end face twist point mold as described in claim 3, characterized in that: The upper template (2) is provided with an oil groove guide post (21), which slides in conjunction with the first guide hole (11).

5. The novel press-fit nut end face twist point mold as described in claim 4, characterized in that: The upper template (2) includes an upper template pad (22) and an upper template clamping plate (23). The upper template clamping plate (23) has a receiving hole (23a) for the oil groove guide post (21) to pass through. The receiving hole (23a) is provided with a relief step (23a1). The oil groove guide post (21) is provided with a snap-fit ​​protrusion (21a) that cooperates with the relief step (23a1).

6. The novel die for the twist point on the end face of a press-fit nut as described in claim 1, 2, or 3, characterized in that: The lower template (1) is provided with a lower mold base (13) on the side away from the upper template (2). The lower mold base (13) includes a first base plate (13a) and a second base plate (13b) spaced apart. At least one support plate (13c) is provided between the first base plate (13a) and the second base plate (13b).

7. The novel press-fit nut end face twist point mold as described in claim 6, characterized in that: The first base plate (13a) is provided with a second guide hole (13a1) that coincides with the axis of the first guide hole (11), and the oil groove guide post (21) can slide freely in the first guide hole (11) and the second guide hole (13a1).

8. The novel press-fit nut end face twist point mold as described in claim 4, characterized in that: The oil tank guide post (21) is provided with several annular grooves (21b) at intervals.

9. The novel die for the twist point on the end face of a press-fit nut as described in claim 1, characterized in that: The upper template (2) is provided with an upper mold joint (24) on the side away from the lower template (1), and the upper mold joint (24) is connected to the main shaft of the stamping machine.

10. The novel press-fit nut end face twist point mold as described in claim 1, characterized in that: The upper template (2) is also provided with an integral pressing knife block (25) on the side near the lower template (1), and the lower template (1) is provided with a lower mold core (14) that cooperates with the integral pressing knife block (25).

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