CN111922499A

CN111922499A - Nut seat projection welding electrode assembly tool and projection welding method thereof

Info

Publication number: CN111922499A
Application number: CN202011106142.8A
Authority: CN
Inventors: 张磊; 张莉; 张�诚; 车前; 邵强
Original assignee: SHAANXI WANFANG AUTO PARTS CO Ltd
Current assignee: SHAANXI WANFANG AUTO PARTS CO Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2020-11-13

Abstract

The invention belongs to the technical field of welding, and relates to a nut seat projection welding electrode assembly tool and a projection welding method thereof. The welding tool and the welding method provided by the invention have the advantages of accurate positioning, stable welding quality and high production efficiency, and effectively improve the projection welding capacity of the nut seat and the production efficiency of products.

Description

Nut seat projection welding electrode assembly tool and projection welding method thereof

Technical Field

The invention belongs to the technical field of welding, and relates to a nut seat projection welding electrode assembly tool and a projection welding method thereof.

Background

With the rapid advance of the automobile industry, the high-level and high-speed production of automobiles is the development trend, and the projection welding process is widely applied to the manufacturing of automobile bodies so as to improve the processing efficiency and quality and meet the requirements of mass assembly production of the automobiles.

The traditional nut seat welding adopts manual welding of resistance welding equipment, welding positioning accuracy is difficult to guarantee, welding quality is poor, welding efficiency is low, and due to the fact that the nut seat is small in structure, a workpiece to be welded is complex in structure and small in space, and manual welding is difficult to weld. How to provide a welding tool and a welding method with accurate welding positioning, stable welding quality and high welding production efficiency is always concerned by automobile manufacturers.

Disclosure of Invention

The invention aims to solve the technical problem of providing a nut seat projection welding electrode assembly tool and a projection welding method thereof, which thoroughly solve the problems that the welding positioning precision is difficult to ensure, the welding quality is poor and the welding efficiency is low when the conventional resistance welding equipment is used for manual welding.

The technical scheme adopted by the invention for solving the technical problem is as follows: a nut seat projection welding electrode assembly tool comprises an upper electrode body 1 and a lower electrode body 2, wherein an upper electrode fixing part 11 is arranged above the upper electrode body 1, a pressing part 12 is arranged below the upper electrode body 1, a bearing part 21 is arranged above the lower electrode body 2, a lower electrode fixing part 22 is arranged below the lower electrode body 2, the upper electrode fixing part 11 is fixedly connected with a projection welding machine cylinder, the lower electrode fixing part 22 is fixedly connected with a projection welding machine mounting seat 3, the pressing part 12 is positioned right above the bearing part 21, and the pressing part 12 is abutted to the bearing part 21 when the projection welding machine cylinder is pressed down to a welding position; a U-shaped groove 13 with a downward opening is radially arranged on the pressing surface of the pressing part 12, the width of the U-shaped groove 13 is larger than that of the nut seat 4, the height of the U-shaped groove 13 is smaller than that of the nut seat 4, an upper positioning pin hole 14 is arranged at the top of the U-shaped groove 13, and an upper insulating pin 15 is arranged in the upper positioning pin hole 14; the pressing part 12 is provided with a horizontal through hole 16 along the radial direction, the through hole 16 is positioned above the U-shaped groove 13, and a magnet 17 is arranged in the through hole 16; a lower positioning pin hole 23 is formed in the pressing surface of the bearing part 21, and a lower insulating pin 24 is arranged in the lower positioning pin hole 23; the nut seat 4 and the workpiece 5 to be welded are respectively provided with a positioning hole; the upper electrode body 1 and the lower electrode body 2 are made of conductive materials, and the upper insulating pin 15 and the lower insulating pin 24 are made of insulating materials.

Preferably, the through hole 16 is arranged in parallel with the U-shaped groove 13.

Preferably, the number of the upper positioning pin holes 14 is multiple, and the upper positioning pin holes 14 are linearly and equidistantly distributed.

Preferably, the lower positioning pin hole 23 is provided in plurality.

Preferably, two side walls of the U-shaped groove 13 are provided with insulating cushion blocks 18 for clamping the nut seat.

Preferably, the insulating cushion block 18 comprises a nylon cushion block, a rubber cushion block and a plastic cushion block.

Preferably, the magnet 17 comprises an electromagnet.

The invention also provides a projection welding method of the nut seat, which comprises the following steps:

the method comprises the following steps: selecting a required lower positioning pin hole 23 according to the size requirement of a welding position, and then inserting a lower insulating pin 24 into a positioning hole of the workpiece 5 to be welded and the lower positioning pin hole 23 to position the workpiece 5 to be welded on the pressing surface of the bearing part 21 so as to complete the positioning of the workpiece 5 to be welded;

step two: selecting a required upper positioning pin hole 14 according to the size requirement of a welding position, then inserting an upper insulating pin 15 into a positioning hole of the nut seat 4 and limiting the top arc of the nut seat 4 by the upper positioning pin hole 14, limiting two sides of the nut seat 4 by insulating cushion blocks 18, and adsorbing the nut seat 4 by the magnetic force of a magnet 17 to complete the positioning of the nut seat 4;

step three: starting a projection welder cylinder, driving the upper electrode body 1 to simultaneously press downwards, stopping pressing downwards after a welding leg below the nut seat 4 to be welded contacts with the workpiece 5 to be welded, and keeping a preset pressure;

step four: starting a welding power supply to apply current for welding, closing the welding power supply to stop welding after the nut seat 4 and the workpiece 5 to be welded are welded for a period of time, and continuously keeping the pressure unchanged;

step five: and maintaining for a period of time after the welding is stopped, stopping applying pressure, lifting the cylinder of the projection welding machine, taking out the welded workpiece, and finishing the welding process.

Preferably, the welding current in the fourth step is 15KA to 18KA, and the welding time is 80ms to 180 ms.

Preferably, the pressure value in step three is 2-2.5 Kgf/cm.

The invention has the beneficial effects that:

1. the method comprises the steps of firstly positioning a workpiece to be welded through different lower positioning pin holes, enabling the welding position of the workpiece to be welded to be opposite to the position of a pressing part when the pressing part is pressed downwards, completing primary positioning, secondly positioning the welding position of a nut seat through different upper positioning pin holes, simultaneously preventing the nut seat from generating lateral position deviation through an insulating cushion block, preventing the nut seat from generating vertical position deviation through a magnet adsorbing nut seat, and simultaneously preventing the nut seat from falling off due to free falling bodies when a welding machine cylinder is pressed downwards to influence the precision of the welding position; because the primary positioning welding workpiece, the secondary positioning nut seat and the upper positioning pin hole are distributed in a straight line and at equal intervals, accurate positioning welding positions before and after welding are realized.

2. The method ensures the stability of welding quality by the method of positioning, pressing down the cylinder and keeping pressure, keeping the pressure unchanged after welding is finished, and stopping applying the pressure after the welding is stopped and kept for a period of time.

3. According to the invention, during batch welding, the positions of the upper positioning pin and the lower positioning pin are sequentially adjusted, secondary adjustment is not required during welding, and the workpiece to be welded and the nut seat are directly positioned and placed respectively, so that the production efficiency of batch welding is improved, and the positioning accuracy and the welding quality stability during batch welding are ensured.

Drawings

FIG. 1 is a front view and a cross-sectional view of a nut seat projection welding electrode assembly tooling;

FIG. 2 is a schematic view of a welding process for projection welding a nut socket;

fig. 3 is a partially enlarged view of fig. 2.

In the figure: 1. an upper electrode body; 2. a lower electrode body; 3. a projection welder mount; 4. a nut seat; 5. a workpiece to be welded; 11. an upper electrode fixing part; 12. a press-fit portion; 13. a U-shaped groove; 14. an upper positioning pin hole; 15. an upper insulating pin; 16. a through hole; 17. a magnet; 18. insulating cushion blocks; 21. a bearing part; 22. a lower electrode fixing portion; 23. a lower positioning pin hole; 24. and a lower insulating pin.

Detailed Description

The related art in the present invention will be described clearly and completely with reference to the accompanying drawings in the following embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, a nut seat projection welding electrode assembly fixture includes an upper electrode body 1 and a lower electrode body 2, wherein an upper electrode fixing portion 11 is disposed above the upper electrode body 1, a pressing portion 12 is disposed below the upper electrode body 1, a bearing portion 21 is disposed above the lower electrode body 2, a lower electrode fixing portion 22 is disposed below the lower electrode body 2, the upper electrode fixing portion 11 is fastened to a projection welding machine cylinder, the lower electrode fixing portion 22 is fastened to a projection welding machine mounting seat 3, the pressing portion 12 is located right above the bearing portion 21, and the pressing portion 12 abuts against the bearing portion 21 when the projection welding machine cylinder is pressed down to a welding position; a U-shaped groove 13 with a downward opening is radially arranged on the pressing surface of the pressing part 12, the width of the U-shaped groove 13 is larger than that of the nut seat 4, the height of the U-shaped groove 13 is smaller than that of the nut seat 4, an upper positioning pin hole 14 is arranged at the top of the U-shaped groove 13, and an upper insulating pin 15 is arranged in the upper positioning pin hole 14; the pressing part 12 is provided with a horizontal through hole 16 along the radial direction, the through hole 16 is positioned above the U-shaped groove 13, and a magnet 17 is arranged in the through hole 16; a lower positioning pin hole 23 is formed in the pressing surface of the bearing part 21, and a lower insulating pin 24 is arranged in the lower positioning pin hole 23; the nut seat 4 and the workpiece 5 to be welded are respectively provided with a positioning hole; the upper electrode body 1 and the lower electrode body 2 are made of conductive materials, and the upper insulating pin 15 and the lower insulating pin 24 are made of insulating materials.

Further, the through hole 16 is arranged in parallel with the U-shaped groove 13.

Furthermore, a plurality of upper positioning pin holes 14 are arranged, and the upper positioning pin holes 14 are linearly distributed at equal intervals.

Further, the lower positioning pin hole 23 is provided in plurality.

Furthermore, two side walls of the U-shaped groove 13 are provided with insulating cushion blocks 18 for clamping the nut seat.

Further, the insulating blocks 18 include nylon blocks, rubber blocks, and plastic blocks.

Further, the magnet 17 includes an electromagnet.

Furthermore, the welding current in the fourth step is 15KA to 18KA, and the welding time is 80ms to 180 ms.

Further, the pressure value in the third step is 2-2.5 Kgf/cm.

Examples

This embodiment adopts two to go up locating pin holes, two locating pin holes down, U type groove both sides wall to adopt the nylon cushion to adopt the electro-magnet as insulating cushion, magnet. When the method is specifically implemented, firstly, a proper lower positioning pin hole is selected for a workpiece to be welded according to the requirement of the size of a welding position, then the lower positioning pin penetrates through the positioning hole in the workpiece to be welded and is inserted into the lower positioning pin hole, so that the welding position of the workpiece to be welded is positioned right below the pressing position of the projection welding machine cylinder, and the positioning of the workpiece to be welded is completed. Secondly, selecting an upper positioning pin hole for a nut seat for welding according to the requirement of the size of a welding position, inserting an upper positioning pin into the upper positioning pin hole after the upper positioning pin penetrates through the positioning hole of the nut seat, limiting the horizontal movement of the nut seat, simultaneously clamping the upper positioning pin between the nut seat and the side wall of the U-shaped groove through a nylon cushion block, further limiting the degree of freedom of the nut seat in the horizontal direction, and finally adsorbing the upper part of the nut seat through a magnetic field generated by electrifying an electromagnet, so that the upper part of the nut seat is tightly attached to the top of the U-shaped groove, limiting the degree of freedom of the nut seat in the vertical direction, and completing the. And thirdly, starting a cylinder of the projection welding machine, driving the upper electrode body and the nut seat to simultaneously press down by the cylinder, and enabling a welding leg below the nut seat to contact a workpiece to be welded according to the size of a welding position and keep a preset pressure. Fourthly, the welding power supply is started to carry out welding, and the welding power supply is closed and the pressure is kept unchanged after the welding is finished. Because the upper electrode body and the lower electrode body are made of conductive materials, and the upper insulating pin and the lower insulating pin are made of insulating materials, welding current only flows into a workpiece to be welded through a welding leg below the nut seat, and the stability of welding quality is ensured. Fifthly, after the welding is stopped and maintained for a period of time, the application of pressure on the welding piece is stopped, meanwhile, the power supply of the electromagnet is turned off, the cylinder of the projection welding machine is lifted, the welded workpiece stays on the upper surface of the bearing part due to the fact that the magnetism of the electromagnet disappears, an operator takes out the welded workpiece, and the welding process of the wheel is finished.

If batch welding is needed, the positioning positions of the upper positioning pin and the lower positioning pin do not need to be adjusted again, and welding can be carried out only after a new workpiece to be welded and a new nut seat are positioned and placed in the confirmed positioning hole.

In conclusion, the invention provides the nut seat projection welding electrode assembly tool and the projection welding method thereof, which thoroughly solve the problems that the welding positioning precision is difficult to ensure, the welding quality is poor and the welding efficiency is low when the conventional resistance welding equipment is used for manual welding, and therefore, the invention has wide application prospect.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A nut seat projection welding electrode assembly tool is characterized by comprising an upper electrode body (1) and a lower electrode body (2), wherein an upper electrode fixing part (11) is arranged above the upper electrode body (1), a pressing part (12) is arranged below the upper electrode body (1), a bearing part (21) is arranged above the lower electrode body (2), a lower electrode fixing part (22) is arranged below the lower electrode body (2), the upper electrode fixing part (11) is fixedly connected with a projection welding machine cylinder, the lower electrode fixing part (22) is fixedly connected with a projection welding machine mounting seat (3), the pressing part (12) is positioned right above the bearing part (21), and the pressing part (12) is abutted against the bearing part (21) when the projection welding machine cylinder is pressed down to a welding position;

a U-shaped groove (13) with a downward opening is formed in the radial direction of the pressing surface of the pressing part (12), the width of the U-shaped groove (13) is larger than that of the nut seat (4), the height of the U-shaped groove (13) is smaller than that of the nut seat (4), an upper positioning pin hole (14) is formed in the top of the U-shaped groove (13), and an upper insulating pin (15) is arranged in the upper positioning pin hole (14); a horizontal through hole (16) is formed in the pressing part (12) in the radial direction, the through hole (16) is located above the U-shaped groove (13), and a magnet (17) is arranged in the through hole (16);

a lower positioning pin hole (23) is formed in the pressing surface of the bearing part (21), and a lower insulating pin (24) is arranged in the lower positioning pin hole (23); positioning holes are respectively formed in the nut seat (4) and the workpiece (5) to be welded;

the upper electrode body (1) and the lower electrode body (2) are made of conductive materials, and the upper insulating pin (15) and the lower insulating pin (24) are made of insulating materials.

2. A nut seat projection welding electrode assembly tooling as claimed in claim 1, characterized in that said through hole (16) is arranged in parallel with the U-shaped groove (13).

3. A nut seat projection welding electrode assembly tooling as claimed in claim 1, characterized in that said upper dowel hole (14) is provided in plurality, and said plurality of upper dowel holes (14) are arranged in a straight line and at equal intervals.

4. A nut seat projection welding electrode assembly tooling as claimed in claim 3, characterized in that said lower dowel hole (23) is provided in plurality.

5. A nut seat projection welding electrode assembly tool according to claim 1, characterized in that two side walls of the U-shaped groove (13) are provided with insulating cushion blocks (18) for clamping the nut seat (4).

6. A nut seat projection welding electrode assembly tooling as claimed in claim 5, characterized in that said insulating spacer (18) comprises nylon, rubber, plastic spacers.

7. A nut seat projection welding electrode assembly tooling as claimed in claim 1, characterized in that said magnet (17) comprises an electromagnet.

8. A projection welding method for a nut seat adopts the projection welding electrode assembly tool for the nut seat as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:

the method comprises the following steps: selecting a required lower positioning pin hole (23) according to the size requirement of a welding position, and then inserting a lower insulating pin (24) into a positioning hole of a workpiece (5) to be welded and the lower positioning pin hole (23) to position the workpiece (5) to be welded on a press-fit surface of a bearing part (21) so as to complete the positioning of the workpiece (5) to be welded;

step two: selecting a required upper positioning pin hole (14) according to the size requirement of a welding position, then inserting an upper insulating pin (15) into a positioning hole of the nut seat (4) and limiting the top arc of the nut seat (4) by the upper positioning pin hole (14), limiting two sides of the nut seat (4) through an insulating cushion block (18), and adsorbing the nut seat (4) through the magnetic force of a magnet (17) to complete the positioning of the nut seat (4);

step three: starting a projection welder cylinder, driving the upper electrode body (1) to simultaneously press downwards, stopping pressing downwards after a welding leg below the nut seat (4) to be welded is contacted with a workpiece (5) to be welded, and keeping a preset pressure;

step four: starting a welding power supply to apply current for welding, closing the welding power supply to stop welding after the nut seat (4) and the workpiece (5) to be welded are welded for a period of time, and continuously keeping the pressure unchanged;

9. A method of projection welding a nut seat as defined in claim 8, wherein said welding current in step four is 15KA to 18KA and the welding time is 80ms to 180 ms.

10. A nut seat projection welding method according to claim 8, characterized in that said pressure value in step three is 2-2.5 Kgf/cm.