Lower die provided with automatic blowing mechanism and suitable for projection welding of nuts

Abstract

The utility model belongs to the field of stamping part welding, and particularly relates to a lower die with an automatic blowing mechanism suitable for a projection welding nut. An electrode holder is arranged above the bottom plate, the upper portion of the electrode holder is connected with a lower electrode through a connecting block, a cavity is formed in the connecting position of the connecting block and the lower electrode, a spring is arranged in the cavity, a ventilation pipeline is arranged below the cavity, a quick connector of the ventilation pipeline is connected with an external air source, and a KCF positioning pin is arranged above the spring and penetrates through the lower electrode. The upper half part of the KCF positioning pin is exposed outside, and a gap is arranged between the KCF positioning pin and the inner wall of the lower electrode. The projection welding tool is slightly different from a traditional projection welding tool, the blowing device is additionally arranged, the structure is simple, performance is excellent, debugging and maintenance are convenient, and the service life of the lower electrode and the KCF positioning pin can be effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of stamping part welding, and particularly relates to a lower die with an automatic air blowing mechanism for projection welding nuts. Background Art

[0002] With the cost control in the manufacturing industry, higher requirements are put forward for projection welding tooling. It is often required that the tooling can not only meet the normal operation in the workshop, but also ensure the durability of the tooling and the requirements of easy adjustment and replacement. The existing lower die is applicable to the projection welding of some nuts and is not applicable to all projection welding operations. When welding nuts and parts, the welding slag and garbage generated during projection welding are likely to fall into the inner wall of the electrode, causing great damage to the electrode and KCF positioning pins, and seriously affecting the service life of the lower electrode and KCF positioning pins. Summary of the Invention

[0003] In order to solve the above problems, the utility model provides a mechanism that not only reduces costs but also ensures the stability of the tooling.

[0004] To achieve the above object, the technical solution adopted in this patent is as follows: A lower die with an automatic air blowing mechanism for projection welding nuts, an electrode holder is arranged above the bottom plate, the lower electrode is connected above the electrode holder through a connecting block, a cavity is arranged at the connection of the connecting block and the lower electrode, a spring is arranged in the cavity, a ventilation pipeline is arranged below the cavity, the quick connector of the ventilation pipeline is connected with an external air source, a KCF positioning pin is arranged above the spring, the KCF positioning pin passes through the lower electrode, the upper half of the KCF positioning pin is exposed outside, and a 0.1 mm gap is arranged between the KCF positioning pin and the inner wall of the lower electrode.

[0005] In the above-mentioned lower die with an automatic air blowing mechanism for projection welding nuts, an interconnected water pipeline is arranged in the bottom plate, the electrode holder and the connecting block, and a water connection head Ⅰ and a water connection head Ⅱ are arranged on the water pipeline.

[0006] In the above-mentioned lower die with an automatic air blowing mechanism for projection welding nuts, a rubber sleeve is arranged at the connection of the water pipeline.

[0007] In the above-mentioned lower die with an automatic air blowing mechanism for projection welding nuts, a protective sleeve is arranged outside the electrode holder.

[0008] In the utility model, the KCF positioning pin is used to position parts and nuts, the lower electrode supports the parts, the springs built in the lower electrode and the connecting block play a buffering role, the quick connector is located on the side of the connecting block for ventilation to blow out the welding slag and garbage generated during projection welding from the inner wall of the electrode. The electrode holder and the connecting block are connected by a taper, and a protective sleeve (heat treatment) is installed outside the electrode holder to prevent the electrode holder from deforming during long-term operation. A cooling water channel is arranged between the electrode holder and the bottom plate to play a role in cooling. A rubber sleeve is built in the connection to prevent water leakage. This lower die has a simple structure, complete functions, convenient replacement of the lower electrode, and high utilization rate.

[0009] Advantages of this patent:

[0010] 1. By adding a blowing function, the accumulation of welding slag and garbage in the lower electrode is reduced. Compared with traditional manipulators, not only the service life of the lower electrode is increased, but also the service life of the KCF positioning pin is indirectly increased. This structure is simple to process, convenient to debug, and has excellent performance.

[0011] 2. The electrode seat and the connecting block of the present utility model adopt a taper connection, which is convenient for processing. It can be processed by a lathe, a drill press, and a grinding machine.

[0012] 3. The overall structure of the present utility model is simple. It not only adds a blowing structure, but also adds a protective cover outside the motor seat, which not only ensures durability but also increases stability. And the blowing structure greatly improves the service life of the lower electrode and the KCF positioning pin. Description of the drawings

[0013] Figure 1 State diagram of a lower die with an automatic blowing mechanism for projection welding nuts before welding.

[0014] Figure 2 State diagram of a lower die with an automatic blowing mechanism for projection welding nuts after welding.

[0015] Figure 3 is Figure 2 Enlarged view of part I in the figure.

[0016] The marks in the figure are: 1 - spring, 2 - protective cover, 3 - electrode seat, 4 - bottom plate, 5 - rubber sleeve, 6 - water connection head I, 7 - water connection head II, 8 - quick connector, 9 - connecting block, 10 - lower electrode, 11 - KCF positioning pin, 12 - nut, 13 - part. Detailed implementation manners

[0017] As Figures 1-3 shown, a lower die with an automatic blowing mechanism for projection welding nuts, an electrode seat 3 is arranged above the bottom plate 4, a protective cover 2 is arranged outside the electrode seat 3, the electrode seat 3 is connected to the lower electrode 10 through a connecting block 9 above, the connecting block 9 and the lower electrode 10 are connected by threads, a cavity is arranged at the connection of the connecting block 9 and the lower electrode 10, a spring 1 is arranged in the cavity, a ventilation pipeline is arranged below the cavity, the quick connector 8 of the ventilation pipeline is connected to an external air source, a KCF positioning pin 11 is arranged above the spring 1, the KCF positioning pin 11 passes through the lower electrode, the upper half of the KCF positioning pin 11 is exposed outside, and a gap of 0.1 mm is arranged between the side of the KCF positioning pin 11 and the inner wall of the lower electrode 10. Interconnected water pipelines are arranged in the bottom plate 4, the electrode seat 3 and the connecting block 9, and a water outlet 6 and a water inlet 7 are arranged on the water pipeline. A rubber sleeve 5 is arranged at the connection of the water pipeline.

[0018] The utilization rate of the electrode head is increased. A spring 1 and a quick connector 8 are built inside the connecting block 9. The spring 1 facilitates the positioning and stripping of the product. After the quick connector 8 is connected to the air source and blows air, the garbage and welding slag attached to the inner wall of the lower electrode are cleaned. The advantage of this structure is that the utilization rate of the lower electrode can be greatly increased compared with the traditional projection welding tooling lower die.

[0019] This structure can increase the service life of each lower electrode 10 and the KCF positioning pin 11, and reduce the deformation caused by the impact of the upper die and the heat of the current.

[0020] This device adopts the method of automatic air blowing to fully clean the garbage and welding slag generated during the welding process, and avoid the blockage of the welding slag on the inner wall of the electrode, which causes the KCF to not rebound.

[0021] The usage method is as follows: The KCF positioning pin 11 passes through the part 13 and is placed on the upper surface of the lower electrode 10. The nut 12 is placed on the KCF positioning pin 11. Since the diameter of the upper part of the KCF positioning pin 11 is smaller than that of the lower part, the nut 12 is located at the upper part of the KCF positioning pin 11 and is at a certain distance from the part 13. During welding, the nut 12 moves downward to press against the part 13 for welding. The quick connector 8 is connected to the air source and blows air upward, so that the welding slag and garbage in the inner wall of the lower electrode 10 are blown away in time, without affecting the service life of the lower electrode. At the same time, the water connection head I 6 and the water connection head II 7 are used as the water inlet and outlet to connect the water source, which plays a good cooling role for the high temperature generated by continuous operation.

Claims

1. A lower die with an automatic air blowing mechanism suitable for projection welding nuts, characterized in that: An electrode holder (3) is arranged above the bottom plate (4), and the electrode holder (3) is connected to a lower electrode (10) via a connecting block (9). A cavity is arranged at the connection between the connecting block (9) and the lower electrode (10), and a spring (1) is arranged in the cavity. A ventilation pipeline is arranged below the cavity, and a quick connector (8) of the ventilation pipeline is connected to an external gas source. A KCF positioning pin (11) is arranged above the spring (1), and the KCF positioning pin (11) passes through the lower electrode. The upper half of the KCF positioning pin (11) is exposed to the outside, and a gap is arranged between the KCF positioning pin (11) and the inner wall of the lower electrode (10).

2. A lower die with an automatic air blowing mechanism suitable for projection welding nuts according to claim 1, characterized in that: Interconnected water pipelines are provided inside the bottom plate (4), the electrode seat (3) and the connecting block (9), and a water connection head I (6) and a water connection head II (7) are provided on the water connection pipeline.

3. A lower die with an automatic air blowing mechanism suitable for projection welding nuts according to claim 2, characterized in that: A rubber sleeve (5) is provided at the connection of the water pipe.

4. A lower die with an automatic air blowing mechanism suitable for projection welding nuts according to claim 1, characterized in that: A protective cover (2) is provided outside the electrode holder (3).

5. A lower die with an automatic air blowing mechanism suitable for projection welding nuts according to claim 1, characterized in that: The electrode holder (3) and the connection block (9) are connected in a taper manner.

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