CN110842334A

CN110842334A - Electrode assembly for projection welding of nut

Info

Publication number: CN110842334A
Application number: CN201911013245.7A
Authority: CN
Inventors: 李宁; 郝俏; 尤佳佳
Original assignee: Shandong Aolin Car Fittings Co Ltd
Current assignee: Shandong Aolin Car Fittings Co Ltd; Shanghai Aolin Car Fittings Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-02-28

Abstract

The invention relates to an electrode assembly for projection welding of nuts, which comprises an upper electrode, a lower electrode mounting seat, a working spring, a lower electrode and a positioning pin, wherein the upper electrode is connected with a cylinder of a welding machine; the lower electrode mounting base is arranged below the upper electrode and is provided with a positioning groove; the working spring is arranged in the positioning groove; the lower electrode is arranged above the lower electrode mounting seat; the locating pin includes link and location end, and the link is connected with operating spring, and the location end passes the bottom electrode and upwards stretches out, treats that the welded plate passes the locating pin through the preformed hole on it and places in the bottom electrode top, the location end on be equipped with the location arch, treat that the welded nut is placed in on the location arch. Compared with the prior art, the invention ensures that the nut thread area and the thread edge working area are in a protection state through the design of the positioning pin, and avoids the adhesion influence of liquefied metal splashing and spreading on the nut thread area and the thread edge working area.

Description

Electrode assembly for projection welding of nut

Technical Field

The present invention relates to an electrode assembly, and more particularly, to an electrode assembly for projection welding of nuts.

Background

With the rapid development of the automobile industry, the requirements for high efficiency and individuation are more and more obvious, in the automobile manufacturing process, the nut can be welded by adopting a projection welding process to accurately position the welding position of the nut, the welding quality is improved, and the harm of harmful gas to human bodies can be reduced correspondingly to carbon dioxide gas shielded welding, so that projection welding is widely applied to the automobile industry, but the welding defects caused by various factors in the welding process also bring great influence to the production environment.

The welding slag of the projection welding nut becomes a defect which is difficult to solve in the welding process, and the welding slag easily damages the thread and brings difficulty to the subsequent assembly of the nut. How to effectively prevent and control the welding slag defect of the nut has important significance for the projection welding of the nut.

CN202006351U discloses a projection nut welded positioner, aims at providing a projection nut welded positioner that the structure is succinct small and exquisite, convenient to use is nimble, can accurately fix a position and the direction of projection nut in welding process, and can effectually prevent that the welding slag from being detained. The positioning device comprises a handle and a positioning rod, wherein one end of the positioning rod is contained in the handle, and the other end of the positioning rod is provided with a threaded column. Its tip of bottom electrode among this technical scheme is not equipped with welding slag protective assembly, can't effectually avoid the influence of welding slag defect to the nut.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned drawbacks of the prior art and providing an electrode assembly for projection welding of nuts that avoids the drawbacks of welding slag.

The purpose of the invention can be realized by the following technical scheme:

the electrode assembly for projection welding of the nut comprises an upper electrode, a lower electrode mounting seat, a working spring, a lower electrode and a positioning pin, wherein the electrode assembly specifically comprises:

the upper electrode is connected with a welding machine cylinder, and the welding machine cylinder completes the pressing action;

the lower electrode mounting seat is arranged below the upper electrode and is provided with a positioning groove;

the working spring is arranged in the positioning groove;

the lower electrode is arranged above the lower electrode mounting seat;

the positioning pin comprises a connecting end and a positioning end, the connecting end is connected with the working spring, the positioning end penetrates through the lower electrode and extends upwards, the plate to be welded penetrates through the positioning pin through a preformed hole in the positioning pin and is arranged above the lower electrode, the positioning end is provided with a positioning bulge, and the nut to be welded is arranged on the positioning bulge.

Further, when the cylinder of the welding machine is not pressed down, the positioning pin jacks up the nut to be welded through the working spring, and the nut to be welded and the plate to be welded are in an isolated state.

Further, under the state that the cylinder of the welding machine is pressed downwards, a welding leg below the nut to be welded is in contact with the plate to be welded.

Furthermore, the positioning bulge is a cylinder which is coaxial with the positioning pin.

Further, the outer diameter of the positioning protrusion is smaller than that of the positioning pin.

Further, the outer diameter of the positioning pin is smaller than the distance from the welding leg of the nut to be welded to the axis of the nut. The structure ensures that the annular table surface is pressed against the lower part of the nut to be welded, and the contact surface of the annular table surface and the nut to be welded is completely sealed. Meanwhile, the outer wall surface of the positioning pin, the upper surface of the plate to be welded and the inner surface of the welding leg of the nut to be welded jointly form a cavity, the cavity becomes an important area for generating metal liquid spreading, and because the annular table surface is pressed against the sealing surface obtained by the nut to be welded, the threaded area of the nut and the working area of the thread edge are in a protection state.

Further, when the top of the positioning pin forms a downward pressing state of the cylinder of the annular table-board welding machine, the vertical height of the annular table-board is higher than the horizontal height of the upper surface of the plate to be welded.

Furthermore, the connecting end is provided with a spring fixing pin, the positioning groove is internally provided with a spring fixing groove, one end of the working spring is sleeved on the spring fixing pin, and the other end of the working spring is embedded in the spring fixing groove.

The working principle of the invention is as follows:

when the upper electrode is pressed down by a welding machine cylinder, the upper electrode is pressed on the nut to be welded, the nut to be welded is enabled to vertically displace downwards, the welding leg is enabled to be in contact with the upper surface of the plate to be welded, welding is started, the external pressure on a high-temperature welding area is reduced, a welding area cannot be enlarged in time, the heating speed is rapidly increased, liquefied metal cannot flow around due to the influence of the temperature, spraying of metal liquid is generated, the metal liquid radially spreads towards the two sides of the welding leg and along the positioning pin, and the liquefied metal cannot flow to the upper surface of the annular table top due to the fact that the vertical height of the annular table top is higher than the horizontal height of the upper surface of the plate to be welded, and the nut thread area and the thread edge working area are enabled to be.

Compared with the prior art, the invention ensures that the nut thread area and the thread edge working area are in a protection state through the design of the positioning pin, avoids the adhesion influence of liquefied metal splashing and spreading on the nut thread area and the thread edge working area, and can be used for timely springing up a welded product through the spring assembly, thereby obviously improving the efficiency of the blanking process.

Drawings

FIG. 1 is a schematic view showing the structure of an electrode assembly for nut projection welding according to the present invention;

FIG. 2 is a view illustrating a structure of a welding state of an electrode assembly for nut projection welding according to the present invention;

fig. 3 is an enlarged schematic view of a region a in fig. 2.

In the figure: 1. the welding electrode comprises an upper electrode, 2, a lower electrode mounting seat, 3, a positioning groove, 31, a spring fixing groove, 4, a working spring, 5, a lower electrode, 6, a positioning pin, 61, a connecting end, 611, a spring fixing pin, 62, a positioning end, 63, a positioning bulge, 64, an annular table board, 7, a plate to be welded, 8 and a nut to be welded.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

The electrode assembly for projection welding of the nut comprises an upper electrode 1, a lower electrode mounting base 2, a working spring 4, a lower electrode 5 and a positioning pin 6, wherein the upper electrode 1 is connected with a cylinder of a welding machine; the lower electrode mounting base 2 is arranged below the upper electrode 1, and the lower electrode mounting base 2 is provided with a positioning groove 3; the lower electrode 5 is disposed above the lower electrode mount 2.

The working spring 4 is arranged in the positioning groove 3, the connecting end 61 is provided with a spring fixing pin 611, the positioning groove 3 is internally provided with a spring fixing groove 31, one end of the working spring 4 is sleeved on the spring fixing pin 611, and the other end of the working spring is embedded in the spring fixing groove 31.

The positioning pin 6 comprises a connecting end 61 and a positioning end 62, the connecting end 61 is connected with the working spring 4, the positioning end 62 penetrates through the lower electrode 5 and extends upwards, the plate 7 to be welded penetrates through the positioning pin 6 through a preformed hole in the positioning pin and is arranged above the lower electrode 5, a positioning bulge 63 is arranged on the positioning end 62, and the nut 8 to be welded is arranged on the positioning bulge 63. And under the condition that the cylinder of the welding machine is not pressed down, the positioning pin 6 jacks up the nut 8 to be welded through the working spring 4, and the nut 8 to be welded and the plate 7 to be welded are in an isolated state. And under the state that the cylinder of the welding machine is pressed downwards, a welding leg below the nut 8 to be welded is contacted with the plate 7 to be welded.

The positioning projection 63 is a cylinder coaxial with the positioning pin 6. The outer diameter of the positioning projection 63 is smaller than the outer diameter of the positioning pin 6. The outer diameter of the locating pin 6 is smaller than the distance from the leg of the nut 8 to be welded to the nut axis. This construction ensures that the annular table 64 is pressed against the underside of the nut 8 to be welded and forms a complete seal with the contact surfaces between the two. Meanwhile, the outer wall surface of the positioning pin 6, the upper surface of the plate 7 to be welded and the inner surface of the welding leg of the nut 8 to be welded jointly form a cavity which is an important area for generating metal liquid spreading, and because the annular table surface 64 is pressed against the sealing surface obtained by the nut 8 to be welded, the threaded area and the threaded edge working area of the nut are in a protection state. The top of the positioning pin 6 forms an annular table surface 64, and the vertical height of the annular table surface 64 is higher than the horizontal height of the upper surface of the plate 7 to be welded under the state that the cylinder of the welding machine is pressed downwards.

In the specific operation process, when the upper electrode 1 is pressed down by a welding machine cylinder, the upper electrode 1 is pressed on the nut 8 to be welded, the nut 8 to be welded is enabled to vertically displace downwards, the welding leg is enabled to be in contact with the upper surface of the plate 7 to be welded, welding is started, the external pressure on a high-temperature welding area is reduced, the welding area cannot be enlarged in time, the heating speed is rapidly increased, liquefied metal cannot flow around due to the influence of temperature, spraying of metal liquid is generated, the metal liquid radially spreads to the two sides of the welding leg and along the positioning pin 6, and the liquefied metal cannot flow to the upper surface of the annular table board 64 due to the fact that the vertical height of the annular table board 64 is higher than the horizontal height of the upper surface of the plate 7 to be welded, and both a nut thread area and a thread edge working area are in a protection state.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. An electrode assembly for projection welding of nuts, comprising:

the upper electrode (1) is connected with a cylinder of the welding machine;

the lower electrode mounting seat (2) is arranged below the upper electrode (1), and the lower electrode mounting seat (2) is provided with a positioning groove (3);

the working spring (4) is arranged in the positioning groove (3);

the lower electrode (5) is arranged above the lower electrode mounting seat (2);

locating pin (6), including link (61) and location end (62), link (61) are connected with work spring (4), and location end (62) pass lower electrode (5) and upwards stretch out, wait to weld panel (7) and pass locating pin (6) and place in lower electrode (5) top through the preformed hole on it, location end (62) on be equipped with location arch (63), wait to weld nut (8) and place in on location arch (63).

2. An electrode assembly for projection welding of nuts, according to claim 1, characterized in that the positioning pin (6) lifts up the nut (8) to be welded by the working spring (4) in the non-depressed state of the cylinder of the welding machine, the nut (8) to be welded being separated from the sheet (7) to be welded.

3. An electrode assembly for projection welding of nuts, according to claim 2, characterized in that the weld leg under the nut (8) to be welded is in contact with the sheet (7) to be welded in the state of the welder cylinder being pressed down.

4. An electrode assembly for projection welding of nuts, according to claim 1, characterized in that the positioning projection (63) is a cylinder coaxial with the positioning pin (6).

5. An electrode assembly for projection welding of nuts, according to claim 4, characterized in that the outer diameter of the positioning projection (63) is smaller than the outer diameter of the positioning pin (6).

6. An electrode assembly for projection welding of nuts, according to claim 5, characterized in that the outer diameter of the positioning pin (6) is smaller than the distance of the leg of the nut (8) to be welded to the nut axis.

7. An electrode assembly for projection welding of nuts, according to claim 5, characterized in that the top of the positioning pin (6) forms an annular table (64) and the vertical height of the annular table (64) is higher than the horizontal height of the upper surface of the sheet (7) to be welded in the state that the cylinder of the welding machine is pressed down.

8. The electrode assembly for projection welding of nuts as claimed in claim 1, wherein the connection end (61) is provided with a spring fixing pin (611), the positioning groove (3) is provided with a spring fixing groove (31), and the working spring (4) has one end sleeved on the spring fixing pin (611) and the other end embedded in the spring fixing groove (31).