A cold heading structure for assisting in forming and positioning

Abstract

The present invention provides a cold heading structure for auxiliary forming positioning, which is used to improve the problem that the coaxiality of the contact is affected due to the offset of the forming punch during forming caused by the uneven flow of materials during cold heading forming. When the heading equipment is closed, this structure can perform positioning and correction of the positions of the forming punch and the fixed table in the Z direction and the Y direction by relying on the cooperating inclined surfaces, reducing the influence of the deflection of the moving slider position towards the sliding gap when the materials flow unevenly, thereby improving the forming dimensional accuracy of the contact.

Description

Technical Field

[0001] The present invention belongs to the field of metal cold heading forming, and particularly relates to a cold heading structure for auxiliary forming and positioning. Background Art

[0002] When using a general double-metal composite contact cold heading machine to cold heading contacts, due to the inherent characteristics of wire shearing and the influence of the bonding position of the two metals, the uneven flow of materials during contact forming is caused. In addition, for a general cold heading structure, as Figure 1 shown, when the fixed table 2 installed on the fixed base 1 and the forming punch 5 installed on the cross 6 finally cold heading the contact, the lateral force generated by the uneven flow of materials will act on the forming punch 5, causing the forming punch to have a tendency to deflect laterally. Since the forming punch 5 is fixed on the cross 6, the cross 6 is firmly connected to the moving slider 7, and the moving slider 7 and the Z-direction slider guide block have a sliding gap in the Y direction of the coordinate system 11 as shown in Figure 1 , and the combination of the moving slider 7 and the Z-direction sliding guide block 8 all slides in the X direction following the main slider 9. Therefore, there is a sliding gap between the main slider 9 and the X-direction sliding guide block in the Z direction of the coordinate system as shown in Figure 1 . Since the sliding gap of the general cold heading equipment is 0.02 mm, during contact forming, due to the uneven flow of materials, the forming punch 5 will deflect and misalign, and the maximum value is times the sliding gap, that is, 0.031 mm, which is reflected in the coaxiality of the contact as ◎0.06 mm. Adding the manufacturing tolerance of the forming accessories, the general coaxiality requirement for the contact is ◎0.10 mm. With the requirement of high-speed automation of relay contact riveting, the dimensional accuracy requirement for the contact is getting higher and higher. Generally, it is required to control the coaxiality of the contact within ◎0.06 mm to avoid scratching when the contact rod is inserted into the corresponding hole of the material tape and affecting the riveting quality.

[0003] In view of the fact that in the prior art, the lateral force generated by the uneven flow of materials acts on the forming punch, causing the forming punch to have a tendency to deflect laterally and affecting the coaxiality of the processed contact, and with the requirement of high-speed automation of relay contact riveting, it is necessary to design an auxiliary structure to reduce or eliminate the adverse effects brought by the lateral force generated by the uneven flow of materials. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a cold heading structure for auxiliary forming and positioning to improve the deflection phenomenon caused by the uneven flow of materials and the existence of sliding gaps during contact forming, thereby improving the dimensional accuracy and stability of contact forming.

[0005] The technical solution of the present invention is as follows:

[0006] A cold heading structure for auxiliary forming positioning, comprising a fixed base component and a moving slider component. The fixed base component includes a fixed base, an outwardly protruding fixed table, an inwardly concave Z-direction correction insert, and a first cavity and a second cavity formed in the fixed base for installing the fixed table and the Z-direction correction insert respectively. The outer shapes of the cavities for installing the first cavity and the second cavity match the shapes of the fixed table and the Z-direction correction insert respectively, which can prevent the fixed table and the Z-direction correction insert from rotating relative to the fixed base after installation. The moving slider component includes an installation cross, an outwardly protruding preforming punch, an inwardly concave forming punch, and a third cavity and a fourth cavity formed in the installation cross for installing the preforming punch and the forming punch respectively. The outer shapes of the third cavity and the fourth cavity match the shapes of the preforming punch and the forming punch respectively, which can prevent the preforming punch and the forming punch from rotating relative to the installation cross after installation. The outwardly protruding fixed table cooperates with the inwardly concave forming punch to limit the displacement of the fixed base component and the moving slider component in the Y-axis direction. The inwardly concave Z-direction correction insert cooperates with the outwardly protruding preforming punch to limit the displacement of the fixed base component and the moving slider component in the Z-axis direction.

[0007] Furthermore, the fixed table is integrally cylindrical, with a first positioning straight surface for installation positioning on one side and a first outwardly protruding V-shaped meshing inclined surface at its front end. The forming punch is integrally rectangular, with a first inwardly concave V-shaped inner concave structure opened at its front end head, and its shape and size match the first outwardly protruding V-shaped meshing inclined surface of the fixed table. The Z-direction correction insert is integrally cylindrical, with a second inwardly concave V-shaped inner concave structure at its front end, and an avoidance hole for a thimble extending from the preforming punch is opened at the center of the cylinder. A second positioning straight surface for installation positioning is arranged on one side of the cylinder. The head of the preforming punch is a second outwardly protruding V-shaped meshing inclined surface, and its shape and size match the second inwardly concave V-shaped inner concave structure of the Z-direction correction insert.

[0008] The opening angle range of the second inwardly concave V-shaped inner concave structure where the inwardly concave Z-direction correction insert meshes with the outwardly protruding preforming punch is 60 - 120 degrees. The angle range of the first outwardly protruding V-shaped meshing inclined surface of the outwardly protruding fixed table that meshes with the inwardly concave forming punch is 60 - 120 degrees.

[0009] Preferably, the opening angle of the second inwardly concave V-shaped inner concave structure where the inwardly concave Z-direction correction insert meshes with the outwardly protruding preforming punch is 60 degrees. The angle of the first outwardly protruding V-shaped meshing inclined surface of the outwardly protruding fixed table that meshes with the inwardly concave forming punch is 60 degrees.

[0010] Furthermore, the installation position of the concave Z-direction calibration insert is above the installation position of the convex fixing table; the installation position of the convex pre-forming punch is above the installation position of the concave forming punch.

[0011] Furthermore, the tail of the concave forming punch includes a small section of cylinder for clamping during polishing.

[0012] At the pre-forming station, the fixing table and the pre-forming punch are on the same horizontal plane and are located at opposite positions on the same axis, and the second concave V-shaped structure and the second convex V-shaped meshing inclined surface are arranged opposite to each other.

[0013] At the forming station, the fixing table and the forming punch are on the same horizontal plane and are located at opposite positions on the same axis, and the first convex V-shaped meshing inclined surface and the first V-shaped concave structure are arranged opposite to each other.

[0014] The beneficial effects of the present invention are as follows: The cold heading structure for auxiliary forming and positioning can effectively solve the problem in the general cold heading structure that due to the uneven flow of materials, the moving slider component swings to one side of the sliding gap, resulting in an increase in the coaxiality of the contact points. By means of the V-shaped meshing of the corresponding fittings during forming, the swing is eliminated, and the position accuracy of the head and the rod of the contact point during forming is improved.

[0015] The structure of the present invention is simple and convenient for modification. It can eliminate the swing phenomenon caused by the uneven flow of materials and the existence of sliding gaps during the forming of the contact points, improve the dimensional accuracy and stability of the contact point forming, and thus improve the quality of the contact points. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the general cold heading structure of the existing heading equipment.

[0017] Figure 2 It is a schematic diagram of the cold heading structure for auxiliary forming and positioning of the present invention.

[0018] Figures 3-1 to 3-7 It is a schematic diagram of the working process of the cold heading structure for auxiliary forming and positioning of the invention. Among them Figure 3-1 It is a schematic diagram before pre-forming, Figure 3-2 It is a schematic diagram of pre-forming, Figure 3-3 It is a schematic diagram after pre-forming, Figure 3-4 It is a schematic diagram of the moving slider moving up to the forming station, Figure 3-5 It is a schematic diagram of forming, Figure 3-6 It is a schematic diagram after forming, Figure 3-7 It is a schematic diagram of the moving slider moving down to the pre-forming station.

[0019] Figures 4-1 to 4-6 They are meshing fittings at the pre-forming station; among them, Figure 4-1 , Figure 4-2 andFigure 4-3 The three - view drawings of the Z - direction calibration insert Figure 4-4 、 Figure 4-5 and Figure 4-6 are the three - view drawings of the V - shaped pre - forming punch.

[0020] Figures 5-1 to 5-6 is the meshing fitting at the forming station; among them, Figure 5-1 、 Figure 5-2 and Figure 5-3 are the three - view drawings of the V - shaped fixed table, Figure 5-4 、 Figure 5-5 and Figure 5-6 are the three - view drawings of the V - shaped forming punch.

[0021] Among them, the components referred to by the numerical markings in the attached drawings are as follows:

[0022] 1. Fixed base; 2. Fixed table; 3. Avoidance hole on the fixed base; 4. Pre - forming punch; 5. Forming punch; 6. Cross; 7. Moving slider; 8. Z - direction sliding guide block; 9. Main slider; 10. X - direction sliding guide block; 11. Coordinate system; 12. V - shaped fixed table; 13. Z - direction calibration insert; 14. V - shaped pre - forming punch; 15. V - shaped forming punch; 16. Installation cross; 17. Silver material; 18. Copper material; 19. Alignment of copper - silver materials; 20. Contact pre - form; 21. Formed contact. Specific embodiments

[0024] The present proprietary technology will be further described in conjunction with the attached drawings and specific implementation manners.

[0025] As Figure 2 shown, a cold - heading structure for auxiliary forming positioning mainly includes a fixed - base component and a moving - slider component.

[0026] The fixed - base component is mainly composed of a fixed base 1, a V - shaped fixed table 12, a Z - direction calibration insert 13, etc. Compared with the general cold - heading structure, the V - shaped fixed table 12 has redesigned the outer shape of the fixed table 2 shown in Figure 1 into the shape shown in Figure 5-1 , adding an installation and positioning straight surface on the fixed base 1 and an outward - convex meshing inclined surface with a 60° angle that meshes with the V - shaped forming punch 15 shown in Figure 5-4 . Then, at the position of the avoidance hole 3 on the fixed base 1 of the original general cold - heading structure shown in Figure 1 , a Z - direction calibration insert 13 is newly designed and added, as shown in Figure 2 . The Z - direction calibration insert 13 contains a thimble avoidance hole for fitting the V - shaped pre - forming punch 14, and has an installation and positioning straight surface on the fixed base 1 and an inward - concave meshing inclined surface with a 60° angle that meshes with the V - shaped pre - forming punch 14 shown in Figure 4-4 .

[0027] The moving slider component mainly consists of a V-shaped preforming punch 14, a V-shaped forming punch 15, a mounting cross 16, etc. Compared with the general cold heading structure, the V-shaped preforming punch 14 redesigned the outer shape of the preforming punch 4 shown in Figure 1 into the shape shown in Figure 4-4 . Its cavity with the mounting cross 16 is a rectangular four-sided transitional fit for positioning. Its tail contains a small section of cylinder for clamping during polishing. Its head is designed as an outward convex meshing inclined plane with a 60° angle that meshes with the Z-direction correction insert 13 shown in Figure 4-1 ; The V-shaped forming punch 15 redesigned the outer shape of the forming punch 5 shown in Figure 1 into the shape shown in Figure 5-4 . Its cavity with the mounting cross 16 is a rectangular four-sided transitional fit for positioning. Its tail contains a small section of cylinder for easy clamping during polishing. Its head is designed as an inward concave meshing inclined plane with a 60° angle that meshes with the V-shaped fixed table 12 shown in Figure 5-1 .

[0028] The opening angle range of the above-mentioned meshing inclined plane can be selected from 60 - 120°. This angle range is convenient for the production of the punch and the fixed seat, and has a good meshing effect. It can effectively prevent the device from moving relative to the Y-direction during the entire cold heading process, that is, it meets the requirements of process production and also achieves the positioning effect during the auxiliary cold heading forming process. The 60° embodiment shown in the figure is only one of the realizable ways and should not be construed as a limitation of the present invention.

[0029] As shown in Figures 3-1 to 3-7 , which is a schematic diagram of the working process of the auxiliary forming and positioning cold heading structure of the present invention. When the silver material 17 and the copper material 18 are centered in front of the V-shaped fixed table 12, the moving slider component moves to the preforming position in the Z-direction. At this time, the V-shaped preforming punch 14 and the V-shaped fixed table 12 are on the same axis. The moving slider component moves along the X-axis towards the fixed base component, as shown in Figure 3-1 .

[0030] When the main slider 9 moves to the front dead center, the silver material 17 and the copper material 18 are combined, and their positions are as shown in Figure 3-2 .

[0031] The equipment continues to operate. The main slider 9 drives the moving slider component to retreat along the X-axis to the rear dead center. The contact preform 20 remains on the V-shaped fixed table under the action of the ejector rod of the preforming punch, and its state is as shown in Figure 3-3 .

[0032] The equipment continues to operate. The moving slider component rises along the Z-axis to the forming station. At this time, the V-shaped forming punch 15 and the V-shaped fixed table 12 are on the same axis, and the V-shaped preforming punch 14 and the Z-direction correction insert 13 are on the same axis. The main slider 9 drives the moving slider component to move forward again along the X-axis, as shown inFigure 3-4 as shown

[0033] When the main slider 9 moves to the front dead center again, the V-shaped forming punch 15 meshes with the V-shaped fixed table 12, and this combination restricts the yaw of the contact head in the Y direction during forming; and at this time, the V-shaped pre-forming punch 14 meshes with the Z-direction correction insert 13, and this combination restricts the yaw of the forming contact head in the Z direction. At this station, the contact completes cold heading forming, and its state is as Figure 3-5 as shown

[0034] The equipment continues to run, and the main slider 9 drives the moving slider component to retreat along the X axis to the rear dead center. The forming contact 21 remains on the V-shaped fixed table 12 under the friction force between the contact rod part and the cavity, and its state is as Figure 3-6 as shown

[0035] The equipment continues to run, and the moving slider component descends along the Z axis to the pre-forming station. At the same time, the ejection mechanism of the equipment ejects and collects the forming contact 21 on the V-shaped fixed table 12. The equipment continues to run, and the shearing and conveying of the equipment cuts the silver material 17 and the copper material 18 from the shearing position and axially conveys them to the V-shaped fixed table for centering, as Figure 3-7 shown. At this time, the contact completes one forming cycle

[0036] Then the equipment continues to run, and the contact enters the next forming cycle

[0037] When the equipment runs to the pre-forming station, the outwardly convex V-shaped pre-forming punch and the outwardly convex V-shaped fixed table complete the pre-forming of the contact. At this time, the inwardly concave V-shaped forming punch does not interfere with the fixed base; when the equipment runs to the forming station, the outwardly convex V-shaped pre-forming punch on the moving slider meshes with the Z-direction correction insert with an inwardly concave V-shaped shape on the fixed base, restricting the yaw of the moving slider in the Z direction, and the inwardly concave V-shaped forming punch on the moving slider meshes with the outwardly convex V-shaped fixed table on the fixed base, restricting the yaw of the moving slider in the Y direction. In this way, the coaxiality deviation of the contact caused by the sliding gap can be effectively reduced

[0038] The present invention mainly claims to protect the cold heading structure for auxiliary positioning during forming. As long as the contact forming fitting has a snap-fit and a structure that plays a role in forming correction during contact forming, it belongs to the patent protection scope of the cold heading structure for the present new type of auxiliary forming positioning

Claims

1. A cold heading structure for auxiliary forming positioning, comprising a fixed base component and a moving slider component, characterized in that: The fixed base component includes a fixed base, an outwardly convex fixed table, an inwardly concave Z-direction correction insert, and a first cavity and a second cavity opened in the fixed base for installing the fixed table and the Z-direction correction insert respectively. The cavity shapes of the first cavity and the second cavity for installation are respectively matched with the shapes of the fixed table and the Z-direction correction insert, which can prevent the installed fixed table and Z-direction correction insert from rotating relative to the fixed base; The moving slider component includes an installation cross, an outwardly convex pre-forming punch, an inwardly concave forming punch, and a third cavity and a fourth cavity opened in the installation cross for installing the pre-forming punch and the forming punch respectively. The cavity shapes of the third cavity and the fourth cavity are respectively matched with the shapes of the pre-forming punch and the forming punch, which can prevent the installed pre-forming punch and forming punch from rotating relative to the installation cross; A ejector rod is provided on the pre-forming punch; The ejector rod is used to leave the contact pre-form on the V-shaped fixed table; The outwardly convex fixed table cooperates with the inwardly concave forming punch to limit the displacement of the fixed base component and the moving slider component in the Y-axis direction; The inwardly concave Z-direction correction insert cooperates with the outwardly convex pre-forming punch to limit the displacement of the fixed base component and the moving slider component in the Z-axis direction.

2. The cold heading structure according to claim 1, wherein: The fixed table is integrally cylindrical, with a first positioning straight surface for installation and positioning on one side, and a first outwardly convex V-shaped meshing inclined surface at its front end; The forming punch is integrally rectangular, with a first V-shaped concave structure opened at the front end head thereof, and its shape and size are matched with the first outwardly convex V-shaped meshing inclined surface of the fixed table; The Z-direction correction insert is integrally cylindrical, with a second inwardly concave V-shaped concave structure at its front end, and an avoidance hole for the ejector pin extending from the pre-forming punch is opened at the center of the cylinder; A second positioning straight surface for installation and positioning is arranged on one side of the cylinder; The head of the pre-forming punch is a second outwardly convex V-shaped meshing inclined surface, and its shape and size are matched with the second inwardly concave V-shaped concave structure of the Z-direction correction insert.

3. The cold heading structure according to claim 2, characterized in that: The opening angle range of the second inwardly concave V-shaped concave structure where the inwardly concave Z-direction correction insert meshes with the outwardly convex pre-forming punch is 60 - 120 degrees; The angle range of the first outwardly convex V-shaped meshing inclined surface of the outwardly convex fixed table meshing with the inwardly concave forming punch is 60 - 120 degrees.

4. The cold heading structure according to claim 3, characterized in that: The opening angle of the second inwardly concave V-shaped concave structure where the inwardly concave Z-direction correction insert meshes with the outwardly convex pre-forming punch is 60 degrees; The angle of the first outwardly convex V-shaped meshing inclined surface of the outwardly convex fixed table meshing with the inwardly concave forming punch is 60 degrees.

5. The cold heading structure according to claim 2 or 3, characterized in that: The installation position of the inwardly concave Z-direction correction insert is above the installation position of the outwardly convex fixed table; The installation position of the outwardly convex pre-forming punch is above the inwardly concave forming punch.

6. The cold heading structure according to claim 2 or 3, characterized in that: The tail of the concave forming punch includes a short section of cylinder for clamping during polishing.

7. The cold heading structure according to claim 2 or 3, characterized in that: At the preforming station, the Z-direction calibration insert and the preforming punch are on the same horizontal plane and in a coaxial relative position, and the second concave V-shaped concave structure and the second convex V-shaped meshing inclined surface are arranged opposite to each other.

8. The cold heading structure according to claim 2 or 3, characterized in that: At the forming station, the fixed table and the forming punch are on the same horizontal plane and in a coaxial relative position, and the first convex V-shaped meshing inclined surface and the first V-shaped concave structure are arranged opposite to each other.

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