Flattening mechanism for friction stir welding

Abstract

The utility model relates to the technical field of friction stir welding, and discloses a flattening mechanism for friction stir welding, which comprises a welding tool, a welding head arranged below the welding tool, a mounting plate arranged on one side of the outer part of the welding tool, and a first connecting seat arranged at the central position of the upper end surface of the mounting plate, a second connecting seat is arranged at one end of the operating rod, a knocking rod is movably connected into the second connecting seat, a first through hole is formed in one side of the mounting plate, a knocking hammer is arranged at the end, penetrating out of the first through hole, of the knocking rod, and a rolling wheel frame is arranged on one side of the bottom end of the mounting plate and provided with a flattening mechanism and a cooling mechanism. The flattening roller is driven to rotate through movement of the welding tool to preliminarily flatten the welding part of the thin plate, meanwhile, the U-shaped frame drives the operating rod to turn over with the first connecting base as the center, the knocking hammer is driven to further hammer and flatten the welding part, and the flattening effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of friction stir welding technology, and specifically relates to a friction stir welding flattening mechanism. BACKGROUND

[0002] Friction stir welding is a new solid-phase joining technology patented by the British Welding Institute (TWI) in 1991. Compared with traditional fusion welding, friction stir welding has the advantages of fine-grained joints, no pores, good fatigue performance, tensile performance and bending performance, no dust and spatter during welding, energy saving, no need for welding wire and protective gas, and small residual stress and deformation after welding.

[0003] During the welding process, the stirring needle is inserted into the joint of the thin plate welding part while rotating, and the friction heat between the rotating stirring head and the thin plate welding part causes the material in front of the welding head to undergo intense plastic deformation, and then the highly plastic deformed material is gradually deposited behind the stirring head as the welding head moves, thereby forming a friction stir welding seam. However, the existing equipment has a complex structure system and high cost, the stirring head vibrates during high-speed rotation, affecting the stirring and welding precision, and the height of the stirring head cannot be adjusted, so the welding object is not targeted and does not have wide applicability.

[0004] After searching, a friction stir welding device is disclosed in Chinese patent document

Publication No. CN207971562U

[0005] The utility model realizes the shock absorption function during the stirring friction process and the stable working performance of the protection device by fixing a damping gasket between the second linear motor and the crossbeam, and fixing a uniformly distributed shock absorber between the fixed plate and the shock-absorbing rubber pad on the positioning plate. The lateral displacement of the welded part is realized by the first linear motor, the longitudinal displacement of the stirring assembly is realized by the second linear motor, and the vertical displacement of the stirring assembly is realized by the telescopic structure of the first support rod. At the same time, the structure is simplified for easy maintenance and replacement.

[0006] The device disclosed in this patent still has some shortcomings. When performing stir friction welding on thin plates, this patent causes local and uneven heating of the weldment during the welding process, which leads to deformation of the thin plates. However, the device does not have a mechanical rolling device, so it cannot effectively eliminate the deformation of the thin plates caused by welding. Utility Model Content

[0007] The purpose of the utility model is to provide a flattening mechanism for stir friction welding. The utility model drives the flattening roller to rotate through the movement of the welding tool, and the flattening roller performs preliminary flattening on the welding part of the thin plate. When the flattening roller rotates, the U-shaped frame drives the control rod to slide back and forth up and down, and drives the operating rod to flip with the first connecting seat as the center, thereby driving the striking hammer to further hammer and flatten the welding part, and performing double flattening on the deformation of the welding part, so that the flattening effect is better.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a flattening mechanism for friction stir welding, comprising a welding tool, a welding head disposed below the welding tool, and a mounting plate disposed on one side of the outside of the welding tool, and further comprising:

[0009] A first connecting seat is provided at the center of the upper end surface of the mounting plate, an operating rod is rotatably connected in the first connecting seat, a second connecting seat is provided at one end of the operating rod, a knocking rod is movably connected in the second connecting seat, a first through-hole is provided on one side of the mounting plate, and a knocking hammer is provided at one end of the knocking rod passing through the first through-hole;

[0010] A roller frame is arranged on one side of the bottom end of the mounting plate, and the roller frame is provided with a flattening mechanism for flattening the welding portion and a cooling mechanism for cooling the welding portion.

[0011] Preferably, the flattening mechanism includes a flattening roller rotatably connected to the roller frame and a turntable rotatably connected to both sides of the outer side of the roller frame and coaxially connected to the flattening roller, and the upper parts of the two turntables are rotatably connected to a U-shaped frame.

[0012] Preferably, the diameter of the turntable is smaller than the diameter of the flattening roller.

[0013] Preferably, the top end of the U-shaped frame is rotatably connected to a control rod, a second through-hole is provided on one side of the mounting plate, a section of the control rod passing through the second through-hole is sleeved with a spring for buffering and shock absorption, a third connecting seat is provided at the top end of the control rod, and the other end of the operating rod is movably connected to the third connecting seat.

[0014] Preferably, the cooling mechanism includes a cooling head arranged on one side of the roller frame and a liquid nitrogen pump arranged at the bottom end of the mounting plate, and the liquid outlet of the liquid nitrogen pump is connected to the liquid inlet of the cooling head through a pipeline.

[0015] Preferably, one side and the bottom of the cooling head are provided with liquid outlet holes for discharging liquid nitrogen.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The utility model drives the flattening roller to rotate through the movement of the welding tool, and the flattening roller performs preliminary flattening on the welding part of the thin plate. When the flattening roller rotates, the U-shaped frame drives the control rod to slide back and forth in the second perforation, and drives the operating rod to flip back and forth with the first connecting seat as the center, so that the operating rod drives the knocking rod to slide in the first perforation, thereby driving the knocking hammer to further hammer and flatten the welding part, and performing double flattening on the deformation of the welding part, so that the flattening effect is better.

[0018] The utility model starts the liquid nitrogen pump synchronously when starting the welding tool to discharge the liquid nitrogen through the liquid outlet hole on the cooling head and drip it onto the welding part, thereby cooling the surrounding air and the welding part, and quickly dissipating the high temperature generated by welding, thereby reducing the problem of thin plate deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the mounting plate of the present utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the roller frame of the present utility model.

[0022] In the figure: 1. welding tool; 2. welding head; 3. mounting plate; 4. first connecting seat; 5. operating lever; 6. second connecting seat; 7. knocking rod; 8. first perforation; 9. knocking hammer; 10. roller frame; 11. flattening roller; 12. turntable; 13. U-shaped frame; 14. control lever; 140, spring; 15. second perforation; 16. third connecting seat; 17. cooling head; 18. liquid nitrogen pump; 19. liquid outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-3 As shown, a flattening mechanism for friction stir welding includes a welding tool 1, a welding head 2 mounted below the welding tool 1, and a mounting plate 3 fixedly mounted on the right side of the outside of the welding tool 1 by bolts. It also includes a first connecting seat 4 fixedly mounted on the center position of the upper end surface of the mounting plate 3 by bolts. An operating rod 5 is rotatably connected to the first connecting seat 4. A second connecting seat 6 is integrally provided at one end of the operating rod 5. A knocking rod 7 is movably connected to the second connecting seat 6. The second connecting seat 6 is provided with an elongated hole. The upper end of the knocking rod 7 is fixedly connected to a vertically penetrating pin. The pin passes through the elongated hole in the second connecting seat 6 and is in clearance fit with it. A first through-hole 8 is provided on the right side of the mounting plate 3. A knocking hammer 9 is fixedly mounted on the end of the knocking rod 7 that passes through the first through-hole 8.

[0025] A roller frame 10 is fixedly installed on the left side of the bottom end of the mounting plate 3 by bolts, and a flattening mechanism for flattening the weld portion and a cooling mechanism for cooling the weld portion are installed on the roller frame 10; the flattening mechanism includes a flattening roller 11 rotatably connected to the roller frame 10 and a turntable 12 installed on the front and rear surfaces of the outer side of the roller frame 10 and coaxially connected to the flattening roller 11, and the diameter of the turntable 12 is smaller than the diameter of the flattening roller 11.

[0026] The upper parts of the two turntables 12 are rotatably connected to a U-shaped frame 13, and the top of the U-shaped frame 13 is rotatably connected to a control rod 14. A second through-hole 15 is provided on the left side of the mounting plate 3. A section of the control rod 14 passing through the second through-hole 15 is sleeved with a spring 140 for buffering and shock absorption. The top of the control rod 14 is fixed with a third connecting seat 16 by bolts. The other end of the operating rod 5 is movably connected to the third connecting seat 16. A long hole is provided on the third connecting seat 16. The end of the operating rod 5 is provided with a vertically penetrating pin, which passes through the long hole on the third connecting seat 16 and is clearance-matched with it.

[0027] The cooling mechanism includes a cooling head 17 fixedly mounted on the right side of the roller frame 10 by bolts and a liquid nitrogen pump 18 fixedly mounted on the bottom end of the mounting plate 3 by bolts. The input end of the liquid nitrogen pump 18 is connected to the control end of the welding tool control center, the liquid inlet end of the liquid nitrogen pump 18 is connected to the liquid outlet end of the liquid nitrogen storage tank through a pipeline, and the liquid outlet end of the liquid nitrogen pump 18 is connected to the liquid inlet end of the cooling head 17 through a pipeline. The right side and bottom end of the cooling head 17 are provided with a liquid outlet hole 19 for discharging liquid nitrogen.

[0028] Working principle: The flattening roller 11 is driven to rotate by the movement of the welding tool 1, and the flattening roller 11 performs preliminary flattening on the thin plate welding part. When the flattening roller 11 rotates, the U-shaped frame 13 drives the control rod 14 to slide back and forth in the second through-hole 15, driving the operating rod 5 to flip back and forth with the first connecting seat 4 as the center, so that the operating rod 5 drives the knocking rod 7 to slide up and down in the first through-hole 8, thereby driving the knocking hammer 9 to further hammer and flatten the welding part, and perform double flattening on the deformation of the welding part, so that the flattening effect is better.

[0029] When the welding tool 1 is started, the liquid nitrogen pump 18 is started synchronously to discharge the liquid nitrogen through the liquid outlet 19 on the cooling head 17 and drip onto the welding part, thereby cooling the surrounding air and the welding part, and quickly dissipating the high temperature generated by welding, thereby reducing the problem of thin plate deformation.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flattening mechanism for friction stir welding, comprising a welding tool (1), a welding head (2) disposed below the welding tool (1), and a mounting plate (3) disposed on one side outside the welding tool (1), characterized in that: Also includes: A first connecting seat (4) is provided at the center of the upper end surface of the mounting plate (3), an operating rod (5) is rotatably connected in the first connecting seat (4), a second connecting seat (6) is provided at one end of the operating rod (5), a knocking rod (7) is movably connected in the second connecting seat (6), a first through hole (8) is provided on one side of the mounting plate (3), and a knocking hammer (9) is provided at one end of the knocking rod (7) passing through the first through hole (8); A roller frame (10) is arranged on one side of the bottom end of the mounting plate (3), and the roller frame (10) is provided with a flattening mechanism for flattening the welding portion and a cooling mechanism for cooling the welding portion.

2. The flattening mechanism for friction stir welding according to claim 1, characterized in that: The flattening mechanism comprises a flattening roller (11) rotatably connected to the roller frame (10) and a turntable (12) rotatably connected to the two outer sides of the roller frame (10) and coaxially connected to the flattening roller (11); the upper parts of the two turntables (12) are rotatably connected to a U-shaped frame (13).

3. The flattening mechanism for friction stir welding according to claim 2, characterized in that: The diameter of the rotating disk (12) is smaller than the diameter of the flattening roller (11).

4. The flattening mechanism for friction stir welding according to claim 2, characterized in that: The top end of the U-shaped frame (13) is rotatably connected to a control rod (14); a second through hole (15) is provided on one side of the mounting plate (3); a section of the control rod (14) passing through the second through hole (15) is sleeved with a spring (140) for buffering and shock absorption; a third connecting seat (16) is provided at the top end of the control rod (14); and the other end of the operating rod (5) is movably connected to the third connecting seat (16).

5. The flattening mechanism for friction stir welding according to claim 1, characterized in that: The cooling mechanism comprises a cooling head (17) arranged on one side of the roller frame (10) and a liquid nitrogen pump (18) arranged at the bottom end of the mounting plate (3); the liquid outlet of the liquid nitrogen pump (18) is connected to the liquid inlet of the cooling head (17) through a pipeline.

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