Pressing rivet screw connection forming die
By designing a press-rive screw connection forming mold for press-rive screw connection forming mold, the push rod and chamfer design form an annular groove, the material fills the groove under extrusion pressure and forms an inverted cone structure, and the upper and lower cone structure is realized. The biting connection of the lower sheet solves the problems of cumbersome riveting processes and low production efficiency, and realizes an efficient riveting process.
Patent Information
- Application Number
- CN202420390308.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-01
AI Technical Summary
The existing riveting process is complicated and requires multiple steps. The equipment investment is large and the equipment utilization rate is low, which increases the workload and cost of the operator and low production efficiency.
Design a press-rive screw connection forming mold, including a die, a bolt and a through groove. Riveting can be completed in one process. The push rod and chamfer design form an annular groove, and the material fills the groove under extrusion pressure and Form an inverted cone structure to achieve the joint connection between the upper and lower sheets.
The riveting is completed through one process, which saves equipment investment and personnel operation workload, improves equipment utilization and production efficiency, and greatly reduces production costs.
Smart Images
Figure CN222491766U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of riveting, in particular to a pressure riveting screw connection forming die. Background Art
[0002] The riveting screw connection forming technology is a physical connection technology that uses the principles of stamping and riveting to extrude connection points between plastically deformed plates (such as metal plates) through mold technology. The connection points formed by extrusion hardly damage the intrinsic properties of the material, and have excellent dynamic connection fatigue strength; it is easy to realize automated and large-scale production; it is easy to control product quality; the labor intensity is low; it is environmentally friendly and pollution-free.
[0003] The core of the riveting screw connection forming technology is to extrude appropriate dots on the sheet material to connect the upper and lower sheets together. The process of riveting the forming dots can be divided into four stages: initial pressing, initial forming, plastic forming and pressure holding. Most of the current riveting processes are relatively cumbersome, requiring multiple steps, large equipment investment, low equipment utilization, increased workload of operators, increased costs, and low production efficiency. Utility Model Content
[0004] The purpose of the utility model is to provide a self-clinching screw connection forming die to solve the above-mentioned problems. Parts can be obtained by riveting once in one process, which saves equipment investment, improves equipment utilization, reduces the workload of personnel operation, improves production efficiency, and greatly saves production costs.
[0005] Technical solution: The utility model provides a rivet screw connection forming die, including: a die and a punch, wherein a through slot is provided in the middle of the die; the punch is provided above the die; an upper sheet and a lower sheet are provided between the die and the punch from top to bottom, a push rod is provided in the through slot, the push rod faces the punch, the outer periphery of the upper top surface of the push rod is chamfered, and the contact position between the through slot inside the die and the lower sheet is rounded. The riveted nut can be fixed in the die and the product can be placed on the nut, and the part can be obtained by riveting once in one process, which is highly efficient.
[0006] Furthermore, in the above-mentioned self-clinching screw connection forming mold, the inner diameter of the through groove is the same as the outer diameter of the push rod.
[0007] Furthermore, in the above-mentioned self-clinching screw connection forming mold, the male mold includes: a push rod and a forming part, and the forming part is provided below the push rod, and the forming part is in the shape of a truncated cone.
[0008] Furthermore, in the above-mentioned self-clinching screw connection forming die, the forming portion is directly opposite to the push rod, and the top surface diameter of the forming portion is smaller than the top surface diameter of the push rod.
[0009] Furthermore, in the above-mentioned self-clinching screw connection forming mold, the bottom surface diameter of the forming part is smaller than the diameter of the push rod.
[0010] Furthermore, in the above-mentioned self-riveting screw connection forming die, the chamfer of the outer periphery of the upper top surface of the push rod forms an annular groove with the inner wall of the through groove. The annular groove has no restraining force on the fillet of the lower material, and the material first flows to the annular groove under the action of the extrusion force to fill the annular groove. Then, when the annular groove is in a full state, the resistance of the material flowing to the annular groove gradually increases, making the resistance on the side of the die relatively small, and the material in the upper sheet material begins to squeeze toward the annular groove and the side of the lower sheet material at the same time. In this process, since the upper contour of the connection point is formed by the self-riveting connection point in the initial forming stage, the tissue of the neck-shaped part of the upper sheet material becomes thinner and hardened, preventing its material from flowing upward in the direction of "minimum resistance". The material can only flow "outward", thereby forming an "inverted cone", so that the upper and lower sheets are "interlocked" with each other and connected together.
[0011] Furthermore, in the above-mentioned self-clinching screw connection forming mold, the upper plate material and the lower plate material are materials with plastic deformation.
[0012] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the rivet screw connection forming mold described in the utility model has a simple structure and is easy to operate. Parts can be obtained by riveting once in one process, which saves equipment investment, improves equipment utilization, reduces the workload of personnel operation, improves production efficiency, greatly saves production costs, meets the current consumer demand for high-end car parts, expands customer production capacity, and has good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the initial stage of pressing into the sheet material of a rivet screw connection forming die of the utility model;
[0014] Figure 2 This is a schematic diagram of the initial forming stage of the connection point of the rivet screw of the utility model;
[0015] Figure 3 It is a schematic diagram of the plastic forming stage of the connection point of the self-clinching screw of the utility model.
[0016] In the figure: a die 1, a punch 2, an upper sheet material 3, a lower sheet material 4, a push rod 5, a push rod 21, a forming portion 22, and an annular groove 51. DETAILED DESCRIPTION
[0017] Example 1
[0018] like Figure 1-3A rivet screw connection forming mold shown in the figure includes: a die 1 and a punch 2, wherein a through groove is provided in the middle of the die 1; the punch 2 is arranged above the die 1; an upper sheet 3 and a lower sheet 4 are provided from top to bottom between the die 1 and the punch 2, a push rod 5 is provided in the through groove, the push rod 5 faces the punch 2, the outer periphery of the upper top surface of the push rod 5 is chamfered, and the contact position between the through groove part inside the die 1 and the lower sheet 4 is rounded.
[0019] In this embodiment, the inner diameter of the through groove is the same as the outer diameter of the push rod 5; the punch 2 includes: a push rod 21 and a forming portion 22, a forming portion 22 is provided below the push rod 21, and the forming portion 22 is in the shape of a truncated cone; the forming portion 22 is directly opposite to the push rod 5, and the top surface diameter of the forming portion 22 is smaller than the top surface diameter of the push rod 5; the bottom surface diameter of the forming portion 22 is smaller than the diameter of the push rod 21.
[0020] In this embodiment, the upper plate material 3 and the lower plate material 4 are made of materials capable of plastic deformation.
[0021] like Figure 1 The rivet screw connection forming die shown in the figure, in the initial stage of pressing the rivet screw sheet, from the time when the forming part 22 of the punch 2 contacts the upper sheet 3, to the time when the push rod 5 reaches the dead point, the upper sheet 3 is bent and deformed under the extrusion force of the punch 2, and plastic deformation occurs locally. In this stage, the upper sheet 3 and the lower sheet 4 are mainly elastically deformed, accompanied by a small amount of plastic deformation.
[0022] like Figure 2 A type of forming die for forming a self-riveting screw connection is shown, wherein the chamfer of the outer periphery of the upper top surface of the push rod 5 and the inner wall of the through groove form an annular groove 51; in the initial forming stage of the self-riveting screw connection point, as the punch 2 moves downward, the upper sheet 3 and the lower sheet 4 are constrained by the top surface of the push rod 5, the upper part of the side surface of the die 1, the bottom surface of the forming part 22 and its conical surface, and the upper contour is formed under the combined action of elastic deformation and plastic deformation. In the initial forming stage of the self-riveting screw connection point, the tissue at the upper neck fillet of the upper sheet 3 and the lower sheet 4 is compressed and strengthened due to the extrusion of the punch 2, the die 1, and the push rod 5. At the same time, at the annular groove 51 formed by the die 1 and the push rod 5, since there is no constraint on the material, the material can expand and contract freely, which is helpful for the initial forming of the point and leaves space for the material deformation in the plastic forming stage of the self-riveting connection point.
[0023] like Figure 3In the illustrated embodiment of a rivet screw connection forming die, during the plastic forming stage of the rivet screw connection point, since the annular groove 51 has no restraining force on the fillet of the lower sheet 4, the material first flows to the annular groove 51 under the action of the extrusion force to fill the annular groove 51. Then, when the annular groove 51 is filled, the resistance of the material flowing to the annular groove 51 gradually increases, so that the resistance on the side of the die 1 becomes relatively small, and the material in the upper sheet 3 begins to squeeze toward the annular groove 51 and the side of the lower sheet 4 at the same time. In this process, since the upper contour of the connection point is formed at the initial forming stage of the rivet connection point, the tissue of the neck-shaped part of the upper sheet 3 becomes thinner and hardened, preventing its material from flowing upward in the direction of "minimum resistance", and the material can only flow "outward", thereby forming an "inverted cone", so that the upper sheet 3 and the lower sheet 4 "bite" each other and are connected together. When the punch 2 reaches the dead point, the rivet screw connection point is completely formed. In the final pressure holding stage, the mold continues to maintain pressure for a certain period of time, so that the upper sheet 3 and the lower sheet 4 can fully fill the annular groove 51 and the riveting connection point can be completely formed, thereby preventing the riveting connection point from rebounding.
[0024] It should be noted that the above is only a technical solution of the utility model and is not a limitation. Although the utility model is described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A rivet screw connection forming die, characterized in that: include: A concave die (1), wherein a through groove is provided in the middle of the concave die (1); A male mold (2), wherein the male mold (2) is arranged above the female mold (1); An upper plate (3) and a lower plate (4) are arranged between the die (1) and the punch (2) from top to bottom, a push rod (5) is arranged in the through groove, the push rod (5) is directly opposite to the punch (2), the outer periphery of the upper top surface of the push rod (5) is chamfered, and the contact position between the inner through groove part of the die (1) and the lower plate (4) is rounded.
2. The self-clinching screw connection forming die according to claim 1, characterized in that: The inner diameter of the through groove is the same as the outer diameter of the push rod (5).
3. The self-clinching screw connection forming die according to claim 1, characterized in that: The male mold (2) comprises: a push rod (21) and a forming portion (22); the forming portion (22) is provided below the push rod (21); and the forming portion (22) is in the shape of a truncated cone.
4. The self-clinching screw connection forming die according to claim 3, characterized in that: The forming portion (22) is directly opposite to the push rod (5), and the diameter of the top surface of the forming portion (22) is smaller than the diameter of the top surface of the push rod (5).
5. The self-clinching screw connection forming die according to claim 4, characterized in that: The bottom surface diameter of the forming portion (22) is smaller than the diameter of the top rod (21).
6. The self-clinching screw connection forming die according to claim 1, characterized in that: The chamfered outer periphery of the top surface of the push rod (5) and the inner wall of the through groove form an annular groove (51).
7. The self-clinching screw connection forming die according to claim 1, characterized in that: The upper plate material (3) and the lower plate material (4) are made of materials capable of plastic deformation.