Plate-shaped part and annular closing processing device for preventing pin from falling out
By setting an annular closure in the pin hole and designing a special processing device, using structures such as protruding teeth and avoiding grooves, the problem of pin removal is solved, cost savings and space savings of infinite parts are achieved, and the stability of parts is improved.
Patent Information
- Application Number
- CN201911156154.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-11-22
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2039-11-22
AI Technical Summary
In the prior art, the fit between the pin and the hole makes the pin easily disengaged when multiple parts are assembled, and limiting parts are required to limit axial displacement, increasing cost and space.
By providing an annular closing opening at one end of the pin hole, and designing a processing device including a punch, a lower pad and a protective pin, a structure such as protruding teeth, a avoiding groove, a boss and a guide groove are used to form an annular closing opening to limit the pin Axial displacement to avoid adding limit parts.
It realizes that the axial displacement of the pin is effectively limited without adding limiting parts, reducing cost and space occupation, and at the same time, the stability of the parts is improved through the formation of an annular closure.
Smart Images
Figure CN110748543B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of mechanical processing, and in particular relates to a plate-shaped part for preventing a pin from falling out and an annular closing processing device thereof. Background Art
[0002] At present, the assembly of pins and holes is mainly divided into clearance fit, overfit and interference fit. In the absence of special requirements, the assembly of pins and holes is clearance fit. When multiple parts are assembled and positioned by pins, since the pins and each part are clearance fit, the pins can be displaced axially or even fall out after assembly. At present, in order to limit the axial displacement of the pins, it is necessary to add limiters at both ends of the pins, which increases costs and takes up space. Summary of the invention
[0003] The purpose of the present invention is to provide a plate-like part and an annular closing processing device thereof for preventing a pin from falling out, wherein the part limits the axial displacement of the pin through the annular closing, does not need to add a limiter, reduces costs, and saves space.
[0004] The technical solution adopted by the present invention is:
[0005] A plate-shaped part for preventing a pin from falling out is provided on the part, wherein a pin hole is provided on the part, and a ring-shaped closing opening is provided at one end of the pin hole. When the pin is fitted in the pin hole, it is axially limited by the ring-shaped closing opening.
[0006] A processing device for processing the annular closing on the above-mentioned plate-like parts, including a punch, a lower pad and a protective pin passing through the lower pad, which are arranged on a press machine. The punch and the protective pin are directly opposite to each other and are coaxial. The protective pin can cooperate with the pin hole of the part and is provided with a chamfer at the top. The bottom surface of the punch is provided with an avoidance groove and a circle of protruding teeth for avoiding the protective pin. When the part is placed on the lower pad and the pin hole is matched and passed through the protective pin, the inner side of the upper end opening of the pin hole and the chamfer form a hollow. When the press drives the punch to move down into place, the protruding teeth are pressed into the part at the outer circle position of the pin hole.
[0007] Furthermore, the cross section of the protruding tooth is V-shaped.
[0008] The second processing device for processing the annular closing on the above-mentioned plate-like parts includes a punch, a lower pad, and a protective pin passing through the lower pad, which are arranged on a press. The punch and the protective pin are directly opposite and coaxial up and down. The protective pin can cooperate with the pin hole of the part and the end face is provided with a boss. The bottom surface of the punch is provided with an avoidance groove for avoiding the boss, and the diameter is larger than the diameter of the pin hole of the part. When the part is placed on the lower pad and the pin hole is matched and passed through the protective pin, the upper surface of the part is higher than the end face of the protective pin, thereby forming a hollow inside the upper end opening of the pin hole. When the press drives the punch to move down into place, the bottom surface of the punch presses the part inside and outside the pin hole.
[0009] Further, the avoidance groove can cooperate with the boss.
[0010] The third type of processing device for processing the annular closing on the above-mentioned plate-like parts includes a punch, a lower pad, and a protective pin passing through the lower pad, which are arranged on a press. The punch and the protective pin are directly opposite and coaxial up and down. The punch is provided with a guide groove that can cooperate with the protective pin. The diameter of the protective pin is smaller than the initial hole diameter of the part. The diameter of the punch is larger than the initial hole diameter of the part and equal to the pin hole diameter of the part. When the part is placed on the lower pad and the initial hole is passed through the protective pin, the protective pin passes through the part and forms a hollow with the inner side of the initial hole. When the press drives the punch to move downward, the punch is fitted on the protective pin through the guide groove and then pressed into the hole wall of the initial hole.
[0011] Furthermore, the bottom end of the punch is provided with a smooth chamfer.
[0012] The beneficial effects of the present invention are:
[0013] The part limits the axial displacement of the pin by means of an annular closing, and does not require the addition of a limiter, thereby reducing costs and saving space. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the processing device in the first embodiment of the present invention (the press is omitted).
[0015] Figure 2 It is a cross-sectional view of the part obtained by processing in the first embodiment of the present invention.
[0016] Figure 3 It is a matching diagram of the parts and pins processed in the first embodiment of the present invention.
[0017] Figure 4 It is a schematic diagram of the structure of the processing device in the second embodiment of the present invention (the press is omitted).
[0018] Figure 5 It is a schematic diagram of the structure of the processing device in the third embodiment of the present invention (the press is omitted).
[0019] In the figure: 11-screw; 12-upper die seat; 13-upper pad; 14-punch; 15-protection pin; 16-lower pad; 17-lower die seat; 21-punch; 22-protection pin; 23-lower pad; 31-punch; 32-protection pin; 33-lower pad. DETAILED DESCRIPTION
[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] The present invention provides a plate-shaped part for preventing a pin from coming out, wherein a pin hole is provided on the part, and a ring-shaped closing is provided at one end of the pin hole. When the pin is fitted in the pin hole, the ring-shaped closing is used to limit the axial displacement of the pin. The part limits the axial displacement of the pin by the ring-shaped closing, and does not need to add a limiting part, thereby reducing costs and saving space.
[0022] Embodiment 1
[0023] like Figures 1 to 3 As shown, the processing device for processing the annular closing on the above-mentioned plate-like parts includes a punch 14, a lower pad 16 and a protective pin 15 passing through the lower pad 16, which are arranged on a press. The punch 14 and the protective pin 15 are directly opposite to each other and are coaxial. The protective pin 15 can cooperate with the pin hole of the part and has a chamfer on the top. The bottom surface of the punch 14 is provided with an avoidance groove and a circle of protruding teeth for avoiding the protective pin 15. When the part is placed on the lower pad 16 and the pin hole is matched and passed through the protective pin 15, the inner side of the upper end of the pin hole and the chamfer form a hollow. When the press drives the punch 14 to move down into place, the protruding teeth are pressed into the part at the outer circle position of the pin hole. When the protruding teeth are pressed into the parts, part of the material flows from the riveting surface to the non-riveting surface, and the other part of the material flows inside and outside the riveting line. Due to the hollowness in the pin hole, the material flow resistance is small, and the material mainly flows into the pin hole, thereby forming an annular closure at the end. At the same time, the protective pin 15 controls the shape of the material forming and reduces the deformation of the bottom hole.
[0024] like Figure 1 As shown, in the first embodiment, the cross section of the protruding teeth is V-shaped, which can quickly press into the parts and guide the material into the hole. Of course, the cross section of the protruding teeth is not limited to V-shaped, and can also be other shapes, such as inverted U-shaped.
[0025] Embodiment 2
[0026] like Figure 4 As shown, the processing device for processing the annular closing on the plate-like parts mentioned above comprises a punch 21, a lower pad 23, and a protection pin 22 passing through the lower pad 23, the punch 21 and the protection pin 22 are directly opposite and coaxial, the protection pin 22 can cooperate with the pin hole of the part and the end face is provided with a boss, the bottom face of the punch 21 is provided with an avoidance groove for avoiding the boss, and the diameter is larger than the diameter of the pin hole of the part, when the part is placed on the lower pad 23 and the pin hole is matched and passed through the protection pin 22, the upper surface of the part is higher than the end face of the protection pin 22, so that a hollow is formed inside the upper end of the pin hole, and when the punch 21 is driven by the press to move down to the position, the bottom face of the punch 21 presses into the part inside and outside the pin hole. When the bottom face of the punch 21 is pressed into the part, the part is plastically deformed, and due to the hollow in the pin hole, the material flow resistance is small, and the material mainly flows into the pin hole, so as to form an annular closing at the end.
[0027] like Figure 4As shown, in the second embodiment, the avoidance groove can cooperate with the boss, and when the press drives the punch 21 to move down to the right position, the boss plays a guiding role.
[0028] Embodiment 3
[0029] like Figure 5 As shown, the processing device for processing the annular closing on the above-mentioned plate-like parts includes a punch 31, a lower pad 33, and a protective pin 32 passing through the lower pad 33, which are arranged on a press. The punch 31 and the protective pin 32 are directly opposite to each other and coaxial. The punch 31 is provided with a guide groove that can cooperate with the protective pin 32. The diameter of the protective pin 32 is smaller than the initial hole diameter of the part. The diameter of the punch 31 is larger than the initial hole diameter of the part and equal to the pin hole diameter of the part. When the part is placed on the lower pad 33 and the initial hole is passed through the protective pin 32, the protective pin 32 passes through the part and forms a hollow with the inner side of the initial hole. When the press drives the punch 31 to move downward, the punch 31 is fitted on the protective pin 32 through the guide groove and then pressed into the hole wall of the initial hole. When the punch 31 is pressed into the part, the material on the wall of the initial hole is plastically deformed. Since the protective pin 32 and the inner side of the initial hole are hollow, the material flow resistance is small, so the material mainly flows downward, forming an annular closure at the bottom and simultaneously forming a pin hole.
[0030] like Figure 5 As shown, in the third embodiment, the bottom end of the punch 31 is provided with a smooth chamfer to avoid stress concentration and damage to the annular closure.
[0031] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.
Claims
1. A device for processing an annular closing on a plate-like part to prevent a pin from falling out, characterized in that: The part is provided with a pin hole, and a circle of annular closing is provided at the hole opening at one end of the pin hole. When the pin is fitted in the pin hole, it is axially limited by the annular closing; the device includes a punch, a lower pad and a protective pin passing through the lower pad arranged on the press, the punch and the protective pin are directly opposite and coaxial up and down, the protective pin can be matched with the pin hole of the part and the top end is provided with a chamfer, the bottom surface of the punch is provided with an avoidance groove and a circle of protruding teeth for avoiding the protective pin, when the part is placed on the lower pad and the pin hole is fitted and passed on the protective pin, the inner side of the upper end hole opening of the pin hole and the chamfer form a hollow, when the press drives the punch to move down to the position, the protruding teeth are pressed into the part at the outer circle position of the pin hole; when the protruding teeth are pressed into the part, part of the material flows from the riveting surface to the non-riveting surface, and the other part of the material flows inside and outside the riveting line. Due to the hollowness in the pin hole, the material flow resistance is small, and the material mainly flows into the pin hole, thereby forming an annular closing at the end, and at the same time, the protective pin controls the shape of the material forming to reduce the deformation of the bottom hole.
2. The device for machining an annular closing on a plate-like part to prevent a pin from falling out according to claim 1, characterized in that: The protruding teeth have a V-shaped cross section.
3. A device for processing an annular closing on a plate-like part to prevent a pin from falling out, characterized in that: The part is provided with a pin hole, and a circle of annular closing is provided at the hole opening at one end of the pin hole. When the pin is fitted in the pin hole, it is axially limited by the annular closing; the device comprises a punch, a lower pad, and a protective pin passing through the lower pad, which are arranged on the press. The punch and the protective pin are directly opposite and coaxial up and down. The protective pin can fit with the pin hole of the part and the end face is provided with a boss. The bottom face of the punch is provided with an avoidance groove for avoiding the boss, and the diameter is larger than the pin hole diameter of the part. When the part is placed on the lower pad and the pin hole is fitted and passed through the protective pin, the upper surface of the part is higher than the end face of the protective pin, thereby forming a hollow inside the upper end hole opening of the pin hole. When the press drives the punch to move down into place, the bottom face of the punch presses into the part at the inner and outer sides of the pin hole; when the bottom face of the punch is pressed into the part, the part is plastically deformed. Due to the hollowness in the pin hole, the material flow resistance is small, and the material mainly flows into the pin hole, thereby forming an annular closing at the end.
4. The device for machining an annular closing on a plate-like part to prevent a pin from falling out according to claim 3, characterized in that: The avoidance groove can cooperate with the boss.
5. A device for processing an annular closing on a plate-like part to prevent a pin from falling out, characterized in that: It includes a punch, a lower pad, and a protective pin that passes through the lower pad, which are arranged on a press. The punch and the protective pin are directly opposite to each other and are coaxial. The punch is provided with a guide groove that can cooperate with the protective pin. The diameter of the protective pin is smaller than the diameter of the initial hole of the part. The diameter of the punch is larger than the diameter of the initial hole of the part and equal to the diameter of the pin hole of the part. When the part is placed on the lower pad and the initial hole is passed through the protective pin, the protective pin passes through the part and forms a hollow with the inner side of the initial hole. When the press drives the punch downward, the punch is fitted on the protective pin through the guide groove and then pressed into the hole wall of the initial hole. When the punch is pressed into the part, the material on the wall of the initial hole is plastically deformed. Since the protective pin and the inner side of the initial hole are hollow, the material flow resistance is small, so the material mainly flows downward, thereby forming an annular closure at the bottom, and the pin hole is formed synchronously.
6. The device for machining an annular closing on a plate-like part to prevent a pin from falling out according to claim 5, characterized in that: The bottom end of the punch is provided with a smooth chamfer.