CN220679653U - Lower electrode structure for projection welding bolt - Google Patents
Lower electrode structure for projection welding bolt Download PDFInfo
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- CN220679653U CN220679653U CN202321884750.0U CN202321884750U CN220679653U CN 220679653 U CN220679653 U CN 220679653U CN 202321884750 U CN202321884750 U CN 202321884750U CN 220679653 U CN220679653 U CN 220679653U
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- electrode body
- welding
- projection welding
- lower electrode
- face
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- 238000003466 welding Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 abstract description 17
- 238000009825 accumulation Methods 0.000 abstract description 5
- 239000010953 base metal Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Arc Welding In General (AREA)
Abstract
A lower electrode structure for projection welding bolts comprises an electrode body and an insulating positioning sleeve; the electrode body is provided with a central hole, an insulating positioning sleeve is screwed in the central hole of the electrode body, and axial flat processing surfaces are symmetrically arranged on the outer side wall of the electrode body; the method is characterized in that: the upper end face of the electrode body is provided with an arc surface groove, and the upper end face of the insulating positioning sleeve is flush with the bottom face of the arc surface groove of the upper end face of the electrode body. The utility model realizes the control of the splashing direction of welding slag by improving the end face structure of the lower electrode of the projection welding machine, and achieves the aims of avoiding the accumulation of welding slag at the threaded part of the projection welding bolt and improving the appearance quality of a welding workpiece.
Description
Technical Field
The utility model relates to a projection welding machine, in particular to a lower electrode structure of the projection welding machine for projection welding bolts on steel components.
Background
In a high-profile automotive vehicle type, projection weld bolts are provided in a body sill beam assembly, which function as a baffle for positioning a seat belt. In the prior art, when the projection welding bolt is welded with an automobile threshold beam part, the projection welding bolt is influenced by splashing of welding slag, more welding slag exists at the threaded part of the projection welding bolt, so that the defective rate of the appearance of a welding procedure is greatly improved, and the problem of customer complaints is caused.
Aiming at the problems, related quality control personnel apply quality tools, and the existing problems are found out through analysis of all links of people, machines, materials, methods and rings, because the structural design of the lower electrode of the projection welding machine is unreasonable, welding slag splashes in the thread direction of the projection welding bolt in the welding process, and in order to solve the problems, the lower electrode structure of the existing projection welding machine needs to be optimally designed.
Disclosure of Invention
The utility model provides a lower electrode structure for a projection welding bolt, and aims to realize the control of the splashing direction of welding slag by improving the end face structure of the lower electrode of the projection welding machine, so as to achieve the aims of avoiding the accumulation of welding slag at the threaded part of the projection welding bolt and improving the appearance quality of a welding workpiece.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a lower electrode structure for projection welding bolts comprises an electrode body and an insulating positioning sleeve; the electrode body is provided with a central hole, an insulating positioning sleeve is screwed in the central hole of the electrode body, and axial flat processing surfaces are symmetrically arranged on the outer side wall of the electrode body; the method is characterized in that: the upper end face of the electrode body is provided with an arc surface groove, and the upper end face of the insulating positioning sleeve is flush with the bottom face of the arc surface groove of the upper end face of the electrode body.
In the lower electrode structure for the projection welding bolt, the depth h=0.7 mm of the arc surface groove on the upper end face of the electrode body.
In the lower electrode structure for the projection welding bolt, the distance B=2 mm between the outer edge of the arc surface groove on the upper end surface of the electrode body and the outer edge of the electrode body.
In the lower electrode structure for the projection welding bolt, the radius R=69 mm of the arc surface groove on the upper end surface of the electrode body.
According to the lower electrode structure for the projection welding bolt, the insulation positioning sleeve is a KCF ferrochrome positioning sleeve.
The utility model provides a lower electrode structure for a projection welding bolt, wherein during the welding process of the projection welding bolt and a base metal, the interface of the welding part is quickly melted in a short time, the heat quantity of metal is instantaneously increased, melted liquid is not cooled, liquid is sprayed out of a molten core under the action of pressure to generate welding slag, when the contact point of the welding surface of the bolt and the welding base metal is arranged at the outer side of the contact point of the welding base metal and the lower electrode, molten liquid is splashed inwards and outwards, and the welding slag is adhered on the bolt because the molten liquid splashes to cover the thread position; when the contact point of the bolt welding surface and the welding base material is at the inner side of the contact point of the welding base material and the lower electrode, the molten liquid splashes to the outside; therefore, in order to avoid the influence of the spatter slag on the thread of the projection welding bolt, the direction of the spatter of the molten metal needs to be controlled. According to the utility model, the upper end surface of the electrode body is designed into an arc surface groove structure, so that the contact point of the bolt welding surface and the welding base material is positioned at the inner side of the contact point of the welding base material and the lower electrode, and the phenomenon of welding slag accumulation at the thread position of the projection welding bolt is avoided by interference of welding splashing direction under the action of the pressure of the electrode, and the appearance quality of a welding workpiece is improved. Proved by trial use, the technical scheme of the utility model is adopted to weld the projection welding bolt of the automobile threshold beam part, the defective rate of the appearance quality is reduced to 1.0% from 84.7%, the acceptance of customers is obtained, and the improvement of the stock electrode can be realized by numerical control processing of the end face of the existing lower electrode, so that the production cost is reduced.
Drawings
FIG. 1 is a schematic view of a prior art projection welder bottom electrode structure and spatter of slag during welding;
FIG. 2 is a schematic illustration of the present utility model;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic view of the cross-sectional structure A-A of FIG. 3;
FIG. 5 is a schematic illustration of the spatter of slag during a welding process according to the present utility model.
The reference numerals in the drawings are defined as follows:
1 is a lower electrode body, 1-1 is an arc surface groove, and 1-2 is a flat processing surface;
2 is a projection welding bolt;
3 is a welding parent metal;
and 4 is an insulating positioning sleeve.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific examples.
Referring to fig. 1, in a high-profile automotive vehicle type, a projection welding bolt 2 is provided in a body sill beam assembly, which functions as a shield for positioning a seat belt. In the prior art, when an automobile threshold beam part is welded with a projection welding bolt, the upper end face of a lower electrode of the projection welding machine is of a plane structure, the contact point of the welding face of the projection welding bolt 2 and a welding base metal 3 is arranged on the outer side of the contact point I of the welding base metal 3 and the lower electrode, molten liquid can splash inwards and outwards, welding slag is accumulated at the thread position of the projection welding bolt 2, and therefore the defective rate of the appearance of a welding procedure reaches 84.7%, and the defective rate of the appearance of the welding procedure is caused by the defective condition and complaint of customers.
Referring to fig. 2, 3 and 4, in order to solve the problem of slag accumulation at the thread position of a projection welding bolt 2, the utility model provides a lower electrode structure for the projection welding bolt, which comprises an electrode body 1 and an insulating positioning sleeve 4; the electrode body 1 is provided with a central hole, an insulating positioning sleeve 4 is screwed in the central hole of the electrode body 1, the insulating positioning sleeve 4 is preferably made of KCF ferrochrome, and axial flat processing surfaces 1-2 are symmetrically arranged on the outer side wall of the electrode body 1; the utility model is characterized in that: the upper end face of the electrode body 1 is provided with an arc surface groove 1-1, as a preferred embodiment, the depth h=0.7 mm of the arc surface groove 1-1, the distance b=2 mm between the outer edge of the arc surface groove 1-1 and the outer edge of the electrode body, the radius r=69 mm of the arc surface groove 1-1, and the upper end face of the insulating positioning sleeve 4 is flush with the bottom face of the arc surface groove 1-1 of the upper end face of the electrode body 1.
Referring to fig. 5, the lower electrode structure for the projection welding bolt of the utility model designs the upper end surface of the electrode body 1 into an arc surface groove 1-1 structure, so that the contact point of the welding surface of the projection welding bolt 2 and the welding base metal 3 is positioned at the inner side of the contact point I of the welding base metal 3 and the lower electrode, the contact point of the welding surface of the projection welding bolt 2 and the welding base metal 3 can move towards the bottom surface direction of the arc groove 1-1 under the action of the pressure of the electrode, a guiding surface with the inner low and the outer high is formed at the contact point of the projection welding bolt 2 and the welding base metal 3, and the welding slag is guided to splash outside, thereby avoiding the phenomenon of slag accumulation at the thread position of the projection welding bolt 2 and improving the appearance quality of a welding workpiece. The welding parameters are also required to be optimized in the welding process by matching with the lower electrode structure of the projection welding machine, wherein the pressurizing time is set as follows: 50 ms, the pre-compaction time is set to: 300. 20ms of soil, the welding pressure is set as follows: 1.8 Shi 1KN, the welding time is set as: 200. 20ms of soil, the welding current is set as follows: 18 th 1KA.
Claims (5)
1. A lower electrode structure for projection welding bolts comprises an electrode body (1) and an insulating positioning sleeve (4); the electrode body (1) is provided with a central hole, an insulating positioning sleeve (4) is screwed in the central hole of the electrode body (1), and axial flat processing surfaces (1-2) are symmetrically arranged on the outer side wall of the electrode body (1); the method is characterized in that: the upper end face of the electrode body (1) is provided with an arc surface groove (1-1), and the upper end face of the insulating positioning sleeve (4) is flush with the bottom face of the arc surface groove (1-1) of the upper end face of the electrode body (1).
2. The lower electrode structure for projection welding bolts according to claim 1, wherein: the depth h=0.7 mm of the arc surface groove (1-1) on the upper end surface of the electrode body (1).
3. The lower electrode structure for projection welding bolts according to claim 2, wherein: the distance B=2 mm between the outer edge of the arc surface groove (1-1) on the upper end surface of the electrode body (1) and the outer edge of the electrode body.
4. A lower electrode structure for projection welding bolts according to claim 3, characterized in that: the radius R=69 mm of the arc surface groove (1-1) of the upper end surface of the electrode body (1).
5. The lower electrode structure for projection welding bolts according to any one of claims 1 to 4, characterized in that: the insulation positioning sleeve (4) is a KCF ferrochrome positioning sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321884750.0U CN220679653U (en) | 2023-07-18 | 2023-07-18 | Lower electrode structure for projection welding bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321884750.0U CN220679653U (en) | 2023-07-18 | 2023-07-18 | Lower electrode structure for projection welding bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220679653U true CN220679653U (en) | 2024-03-29 |
Family
ID=90373268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321884750.0U Active CN220679653U (en) | 2023-07-18 | 2023-07-18 | Lower electrode structure for projection welding bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220679653U (en) |
-
2023
- 2023-07-18 CN CN202321884750.0U patent/CN220679653U/en active Active
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