Riveting bushing device

Abstract

The utility model discloses a bushing riveting device which comprises a riveting male die used for forming a bushing on a product piece, the riveting male die comprises a punching plane and a flanging part arranged below the punching plane, the diameter of the flanging part is sequentially reduced from top to bottom, the flanging part and the punching plane are coaxially arranged, and the punching plane is provided with a punching hole. And the maximum diameter of the flanging part is smaller than or equal to the minimum diameter of the stamping plane. The riveting male die is designed, and the stamping plane for final forming and the flanging part for pre-flanging are both arranged on the riveting male die, so that during forming, the separated operation of flanging and stamping forming in sequence is not needed, the bushing riveting time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of riveting equipment, and in particular to a riveting bushing device. Background Art

[0002] Bushings are often used as a mating part in various workplaces, serving various functions such as adjusting clearances, mating parts, and protecting mating surfaces. According to existing riveting experience, the upright part of the bushing is usually folded about 45 degrees, and then flattened to obtain the final finished product.

[0003] Existing riveting generally requires two production steps: flanging first and then forming, before the bushing can be stably riveted to the product. Multiple operations such as demolding and repositioning are required in the middle, which is time-consuming and labor-intensive. To this end, we propose a riveting bushing device that can form the bushing in one step. Summary of the Invention

[0004] The purpose of this application is to provide a riveting bushing device that can form the bushing in one step.

[0005] In order to achieve the above purpose, the technical solution adopted in this application is: a riveted bushing device, comprising a riveting punch for forming the bushing on a product part, the riveting punch comprising a stamping plane and a flanging portion arranged below the stamping plane, the diameter of the flanging portion decreasing from top to bottom, and the flanging portion and the stamping plane being coaxially arranged, the maximum diameter of the flanging portion being less than or equal to the minimum diameter of the stamping plane.

[0006] Preferably, the riveting punch further includes a connecting portion, which is arranged between the stamping plane and the flanging portion, and the diameter of the bottom of the connecting portion is greater than or equal to the diameter of the top of the flanging portion, while the diameter of the top of the connecting portion is less than or equal to the minimum diameter of the stamping plane.

[0007] As a preference, a transition portion is formed between the connecting portion and the stamping plane, and the transition portion is a curved surface or an inclined surface.

[0008] As a preference, the flange portion is an arc surface or an inclined surface, and the angle between the outer side of the flange portion and the vertical surface is 10° to 45°.

[0009] As a preference, a wear-resistant portion having a diameter decay rate greater than the overall diameter decay rate of the flanging portion is formed at the bottom of the flanging portion, and the outer wall of the wear-resistant portion forms a smooth arc surface due to its diameter decay, and a smooth transition is formed between the smooth arc surface and the overall flanging portion.

[0010] As a preference, the riveted bushing device further comprises an upper template and a lower template, the riveting punch is mounted on the bottom of the upper template, and the upper template is further provided with a discharge portion, the discharge portion comprising an elastic member arranged inside the upper template.

[0011] As a preferred embodiment, the product includes an installation groove, the bushing is formed in the installation groove, and the lower template is provided with an elastically installed positioning portion. In the initial state, the positioning portion extends out of the top surface of the lower template, and the installation groove is inserted into the positioning portion during installation.

[0012] As a preferred embodiment, the side projection of the product part is a broken line shape, and a limiting sleeve is provided in the lower template, which limits the installation of the positioning part, and the top of the limiting sleeve extends out of the top surface of the lower template. When installed, the bottom of one side of the product part is exactly against the top surface of the limiting sleeve, and at the same time, the other side of the product part is against the top surface of the lower template; a limiting groove for the positioning part to extend is formed in the middle of the limiting sleeve, and the inner diameter of the limiting groove is the same as the diameter of the connecting part.

[0013] As a preference, the stamping body, the connecting portion and the flanging portion are integrally formed.

[0014] As a preference, the stamping body, the connecting portion and the flanging portion are installed in a detachable manner.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] By designing the riveting punch, the stamping plane used for final forming and the flanging portion used for pre-flanging are both arranged on the riveting punch, so that during forming, there is no need to perform separate operations such as flanging first and then stamping, which helps to reduce the time of riveting the bushing and thus improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0018] Figure 2 yes Figure 1 A cross-sectional view from one angle.

[0019] Figure 3 It is a structural diagram of the riveting punch.

[0020] Figure 4 Schematic diagram of the bushing 9 in the initial state.

[0021] Figure 5 It is a schematic diagram of the bushing 9 in the pre-flanged state.

[0022] Figure 6 It is a schematic diagram of the bushing 9 after molding.

[0023] In the figure: 1. Upper template; 2. Riveting punch; 22. Stamping body; 23. Stamping plane; 24. Transition part; 25. Connection part; 26. Flanging part; 3. Discharge part; 4. Product part; 5. Lower template; 6. Positioning part; 7. Spring; 8. Limit sleeve; 9. Bushing 9; 9a. Initial bushing 9; 9b. Flanging bushing 9; 9c. Finished bushing 9; 10. Mounting groove. DETAILED DESCRIPTION

[0024] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of this application.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0028] Example:

[0029] Reference Figures 1 to 6 This embodiment provides a riveting bushing device, comprising an upper template 1 and a lower template 5, and a riveting punch 2 for forming a bushing 9 on a product 4, wherein the riveting punch 2 is mounted on the bottom of the upper template 1, and the riveting punch 2 comprises a stamping plane 23 and a flange portion 26 disposed below the stamping plane 23. The flange portion 26 is used to perform a flange process on the bushing 9 before forming, so that the bushing 9 is Figure 4 Fold until the edges appear Figure 5 The state shown is the initial bushing 9a. At this time, the top of the bushing 9 is trumpet-shaped, that is, the flanged bushing 9b. Then, it is punched downward through the punching plane 23 to form the bushing 9a. Figure 6 The formed state shown is the finished bushing 9c.

[0030] Among them Figure 3 As shown, the diameter of the flange portion 26 decreases from top to bottom, and the flange portion 26 with a gradually decreasing diameter forms an inclined surface, which may be a curved surface or a flat surface. In order to ensure that the stamping can continue after the flange, the flange portion 26 and the stamping plane 23 are coaxially arranged. The maximum diameter of the flange portion 26 is less than or equal to the minimum diameter of the stamping plane 23. The minimum diameter of the stamping plane 23 is the minimum inner diameter of the bushing 9 when it is formed. As is obvious, Figure 2 and Figure 3 As shown, during the forming process, the flange portion 26 is inserted into the inner cavity of the bushing 9. During the stamping process, the inner cavity of the bushing 9 and the flange of the bushing 9 will not only bend but also deform. This deformation is generally caused by the flattening caused by the stamping process. Therefore, when the bushing 9 has not yet been flanged, the diameter of its inner cavity can be slightly smaller than the diameter of the bottom of the flange portion 26. The flange portion 26 can only act on the inner cavity of the bushing 9 when it descends, thereby gradually tilting outward and deforming through the action of the outer wall inclined surface of the flange portion 26, thereby forming a trumpet-shaped flange. In this embodiment, the riveting punch 2 is designed, and the stamping plane 23 for the final forming and the flange portion 26 for the pre-flanging are both arranged on the riveting punch 2. Therefore, during the forming process, there is no need to perform separate operations such as flanging first and then stamping, which helps to reduce the time of riveting the bushing and thus improve production efficiency.

[0031] like Figure 3 As shown, the riveting punch 2 further includes a connecting portion 25, which is arranged between the punching plane 23 and the flange portion 26. The diameter of the bottom of the connecting portion 25 is greater than or equal to the diameter of the top of the flange portion 26, and the diameter of the top of the connecting portion 25 is less than or equal to the minimum diameter of the punching plane 23. Figure 3As shown, it is cylindrical. Generally speaking, in order to facilitate flanging, the connecting portion 25 can also pass through the inner cavity of the bushing 9. The diameter of the connecting portion 25 is the same as the top diameter of the flanging portion 26. In this way, after the flanging portion 26 passes through the inner cavity of the bushing 9, the connecting portion 25 can also pass through naturally. Since the outer diameter of the flanging portion 26 is variable, after it passes through the inner cavity of the bushing 9, on the one hand, it is necessary to further extrude the diameter of the inner cavity of the bushing 9, and on the other hand, it is necessary to ensure that the inner cavity of the bushing 9 (the part below the flanging) has the same diameter, and the inclined surface on the outside of the flanging portion 26 is difficult to ensure this. Therefore, the provided connecting portion 25 can be appropriately extended, and its length can be 1.5 to 3 times the length of the flanging portion 26. In this way, after the flanging portion 26 is initially passed through for pre-forming, the connecting portion 25 can further homogenize the inner cavity of the bushing 9, thereby ensuring the quality during pre-forming.

[0032] like Figure 3 As shown, a transition portion 24 is formed between the connecting portion 25 and the punching plane 23. The transition portion 24 is a curved or inclined surface. The transition portion 24 is the position where the flanged bushing 9 is finally punched and formed when the upper mold plate 1 is lowered to a certain height. If the transition is performed at the right-angled transition portion 24 formed by the punching plane 23 and the connecting portion 25, significant wear will be generated during punching. Therefore, in this embodiment, a curved or inclined surface is set here to reduce wear on the riveting punch 2 and the bushing 9.

[0033] like Figure 3 As shown, the outer wall of the flange portion 26 is a curved surface or an inclined surface because the diameter decreases successively. The inclined surface is generated when the diameter decays at the same rate, while the curved surface is formed according to the function curve corresponding to the decay rate. Whether it is a curved surface or an inclined surface, the angle between the outer side of the flange portion 26 and the vertical surface is preferably 10° to 45°. When the outer side of the flange portion 26 is a curved surface, this angle refers to the angle between the top position of the flange portion 26 and the vertical surface. This angle corresponds to the corresponding flange angle formed. If this angle is too large, the flange angle formed will be too large, and if this angle is too small, the flange angle formed will be insufficient. Therefore, 10° to 45° is a more suitable angle range.

[0034] The bottom of the flange portion 26 is formed with a wear-resistant portion whose diameter decay rate is greater than the entire diameter decay rate of the flange portion 26. The outer wall of the wear-resistant portion forms a smooth arc surface due to its diameter decay. The smooth arc surface and the entire flange portion 26 form a smooth transition. Figure 3 As shown, the anti-wear portion is the position where the riveting punch 2 first acts on the top wall of the inner cavity of the bushing 9 when it descends. The smooth transition of the anti-wear portion here can ensure that the wear generated during the connection is small.

[0035] like Figure 1 、 Figure 2As shown, the upper template 1 is also provided with a discharge part 3, which includes an elastic part (the elastic part is not shown, and is generally selected as a spring) arranged inside the upper template 1. After the riveting punch 2 rivets the bushing 9 into shape, the bushing 9 and the product part 4 can be directly taken out through the interference fit between the bushing 9 and the bushing 9. At this time, the elastic part is reset and the discharge part 3 is extended to push the product part 4 out of the material.

[0036] like Figure 2 、 Figure 4 As shown, the product 4 includes a mounting groove 10, a bushing 9 is formed in the mounting groove 10, and the lower template 5 is provided with a positioning portion 6 for elastic installation, which can be Figure 2 As shown, the assembly utilizes springs 7 and is limited in position by the provision of stop sleeves 8. Initially, the positioning portion 6 extends beyond the top surface of the lower template 5. During installation, the mounting groove 10 is inserted into the positioning portion 6. This facilitates initial positioning of the bushing 9 and the product 4. During initial installation, the bushing 9 is inserted from the bottom of the mounting groove 10 on the product 4 and then positioned against the positioning portion 6 for positioning.

[0037] The preferred product part 4 of this embodiment is as follows Figure 4 As shown, it is usually used in the handle of the car seat, and its side projection can be referred to Figure 2 , forming a broken line configuration. A limiting sleeve 8 is provided within the lower template 5. The limiting sleeve 8 limits the installation of the positioning portion 6, and the top of the limiting sleeve 8 extends beyond the top surface of the lower template 5. During installation, the bottom of one side of the product part 4 is exactly against the top surface of the limiting sleeve 8, while the other side of the product part 4 is against the top surface of the lower template 5. A limiting groove is formed in the middle of the limiting sleeve 8 for the positioning portion 6 to extend. The inner diameter of the limiting groove is the same as the diameter of the connecting portion 25. By designing the shape of the limiting sleeve 8, it is possible to ensure that the product part 4 is in a relatively stable state after the initial positioning, so that it is not easy to shake during the subsequent riveting of the bushing 9.

[0038] The stamping body 22, the connecting portion 25 and the flange portion 26 of this embodiment can be integrally formed, which simplifies the production process.

[0039] The stamping body 22, the connecting portion 25 and the flanging portion 26 of this embodiment can also be separately formed and then installed in a detachable manner, which is convenient for subsequent maintenance and replacement of wearing parts.

[0040] The above describes the basic principles, main features, and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present application. Various changes and improvements may be made to the present application without departing from the spirit and scope of the present application. These changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A riveted bushing device, characterized in that: It includes a rivet punch for forming a bushing on a product part, the rivet punch includes a stamping plane and a flanging portion arranged below the stamping plane, the diameter of the flanging portion decreases from top to bottom, and the flanging portion and the stamping plane are coaxially arranged, and the maximum diameter of the flanging portion is less than or equal to the minimum diameter of the stamping plane.

2. The riveted bushing device according to claim 1, wherein: The riveting punch also includes a connecting portion, which is arranged between the stamping plane and the flanging portion. The diameter of the bottom of the connecting portion is greater than or equal to the diameter of the top of the flanging portion, and the diameter of the top of the connecting portion is less than or equal to the minimum diameter of the stamping plane.

3. The riveted bushing device according to claim 2, wherein: A transition portion is formed between the connecting portion and the stamping plane, and the transition portion is a curved surface or an inclined surface.

4. The riveted bushing device according to claim 1, wherein: The flange portion is a curved surface or an inclined surface, and the angle between the outer side of the flange portion and the vertical surface is 10° to 45°.

5. The riveted bushing device according to claim 1, wherein: The bottom of the flanging portion is formed with an anti-wear portion whose diameter decay rate is greater than the overall diameter decay rate of the flanging portion. The outer wall of the anti-wear portion forms a smooth arc surface due to its diameter decay, and a smooth transition is formed between the smooth arc surface and the flanging portion as a whole.

6. The riveted bushing device according to claim 2, wherein: It also includes an upper template and a lower template. The riveting punch is installed at the bottom of the upper template, and the upper template is also provided with a discharge part. The discharge part includes an elastic member arranged inside the upper template.

7. The riveted bushing device according to claim 6, wherein: The product part includes an installation groove, the bushing is formed in the installation groove, and the lower template is provided with an elastically installed positioning part. In the initial state, the positioning part extends out of the top surface of the lower template, and the installation groove is inserted into the positioning part during installation.

8. The riveted bushing device according to claim 7, wherein: The side projection of the product part is a broken line shape, and a limiting sleeve is provided in the lower template. The limiting sleeve limits the installation of the positioning part, and the top of the limiting sleeve extends out of the top surface of the lower template. When installed, the bottom of one side of the product part is exactly against the top surface of the limiting sleeve, and at the same time, the other side of the product part is against the top surface of the lower template; a limiting groove for the positioning part to extend is formed in the middle of the limiting sleeve, and the inner diameter of the limiting groove is the same as the diameter of the connecting part.

9. The riveted bushing device according to claim 2, wherein: The riveting punch further comprises a punching body, and the punching body, the connecting portion and the flanging portion are integrally formed.

10. The riveted bushing device according to claim 2, wherein: The riveting punch further includes a punching body, and the punching body, the connecting portion and the flanging portion are detachably mounted.

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