Filling wire friction stir welding stirring head

Abstract

The invention relates to the technical field of new energy battery boxes, and particularly discloses a filler wire friction stir welding stirring head which comprises an equipment installation clamping piece. The limiting structure plate is fixedly connected to the bottom end of the equipment mounting clamping piece; the stirring main body is mounted at the bottom end of the limiting structure plate; through the arrangement of the limiting structure plate, the stirring body, the welding wire stirring spiral groove and the wire feeding hole, after a welding wire is inserted into the welding wire stirring spiral groove, wire filling welding is adopted, the welding wire can be directly smashed and directly filled downwards, in the welding process, due to filling of the welding wire, the defect caused by no material filling cannot be caused, and the welding quality is improved. Therefore, scrapping, water leakage and gas leakage of the battery box are reduced, the quality defect occurring in the friction stir welding process is effectively overcome, the repair amount is reduced, the personnel safety is improved, the working environment is improved, and the production competitiveness of enterprises is further improved.

Description

Technical Field

[0001] This invention belongs to the field of new energy battery box technology, specifically relating to a stirring head for wire-filled friction stir welding. Background Technology

[0002] Against the backdrop of the rapid development of the new energy vehicle industry, the aluminum battery box, as a core load-bearing component, directly affects the safety and reliability of the entire vehicle through its welding quality. Currently, the industry generally adopts friction stir welding to connect aluminum alloy battery boxes. This technology has become the mainstream method for manufacturing lightweight aluminum alloy structural components due to its advantages such as low heat input, small deformation, and no welding defects.

[0003] However, welding aluminum battery boxes in actual production still faces significant challenges: the welding process based on the traditional stirring pin design has obvious limitations when dealing with the complex structure of the battery box. Specifically, the geometric parameters of the traditional stirring pin are not well matched with the actual gap of the aluminum battery box to be welded. When the diameter of the stirring pin does not match the gap of the weld, on the one hand, the pin cannot fully fill the gap area, resulting in insufficient plastic flow of the material during the welding process. The root of the weld is prone to forming an incompletely closed cavity (i.e., root hole defect). Such holes will significantly reduce the fatigue resistance of the weld. On the other hand, excessive cutting or uneven extrusion of the sheet metal by the stirring pin during the rotation and extrusion process will cause the metal in the heat-affected zone of the weld to be lost along the thickness direction, eventually forming a local thinning phenomenon, which directly affects the structural strength and pressure resistance of the battery box. Summary of the Invention

[0004] The purpose of this invention is to provide a stirring head for filler wire friction stir welding, in order to solve the problems mentioned in the background art, such as thinning of the product and root holes during traditional stirring pin welding, and the inability to match the stirring pin due to product gap issues, resulting in unqualified product quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A wire-filled friction stir welding head, comprising:

[0007] Equipment mounting clamps;

[0008] A limiting structure plate, which is fixedly connected to the bottom end of the equipment mounting clamp;

[0009] The mixing body is installed at the bottom of the limiting structure plate. The mixing body has a wire feeding hole inside, and a welding wire stirring spiral groove is inserted inside the wire feeding hole. The mixing body is provided with a limiting sleeve mounting seat on the outside. The limiting sleeve mounting seat has a mounting thread hole on the outside. The bottom end of the limiting sleeve mounting seat has a welding wire filling stirring pressing groove. A stirring needle is inserted at the bottom end of the welding wire filling stirring pressing groove.

[0010] Preferably, the stirring body is inserted and installed inside the limiting sleeve mounting base, and the inside of the welding wire stirring spiral groove is filled with welding wire.

[0011] Preferably, the mounting threaded hole is inserted through the outside of the limiting sleeve mounting base, and the limiting sleeve mounting base is a cylindrical hole groove.

[0012] Preferably, the device mounting clamp is welded to the top of the limiting structure plate, and a groove is formed on the outer side wall of the device mounting clamp.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention, through the design of a limiting structure plate, a stirring body, a welding wire stirring spiral groove, and a wire feeding hole, allows the welding wire to be directly agitated and filled downwards after being inserted into the welding wire stirring spiral groove during filler welding. This filler process prevents defects caused by insufficient material during welding, thereby reducing battery box scrap and leaks. It effectively solves quality defects occurring during friction stir welding, reduces rework, improves personnel safety, enhances the working environment, and further improves the company's production competitiveness. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the structure of the present invention.

[0017] In the diagram: 1. Equipment mounting clamp; 2. Limiting structure plate; 3. Mixing body; 4. Welding wire mixing spiral groove; 5. Wire feeding hole; 6. Mounting threaded hole; 7. Mixing needle; 8. Welding wire filling mixing pressing groove; 9. Limiting sleeve mounting base. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] Please see Figures 1-2 As shown, the filler wire friction stir welding head includes:

[0021] Equipment mounting clamp 1;

[0022] Limiting structure plate 2, which is fixedly connected to the bottom end of the equipment mounting clamp 1;

[0023] A mixing body 3 is installed at the bottom end of a limiting structure plate 2. The mixing body 3 has a wire feeding hole 5 inside, and a welding wire stirring spiral groove 4 is inserted inside the wire feeding hole 5. A limiting sleeve mounting seat 9 is provided on the outside of the mixing body 3. A mounting threaded hole 6 is provided on the outside of the limiting sleeve mounting seat 9. A welding wire filling stirring pressure groove 8 is provided at the bottom end of the limiting sleeve mounting seat 9. A stirring needle 7 is inserted at the bottom end of the welding wire filling stirring pressure groove 8. The mixing body 3 is inserted inside the limiting sleeve mounting seat 9. The welding wire stirring spiral groove 4 is filled with welding wire. The mounting threaded hole 6 is inserted through the outside of the limiting sleeve mounting seat 9. The limiting sleeve mounting seat 9 is a cylindrical slot. A device mounting clamp 1 is welded to the top end of the limiting structure plate 2. A groove is provided on the outer wall of the device mounting clamp 1.

[0024] Specifically, in the optimization practice of friction stir welding process for aluminum battery boxes, in order to systematically solve the quality defects such as thinning of weld and root holes caused by traditional stirring pin 7 welding, the stirring pin 7 body is first installed normally inside the sheath. After installation, the welding wire is fed into the wire feeding hole 5 in manual mode. Then, after the welding wire is installed, the equipment is driven to perform welding. The wire feeding frequency is controlled by the PLC and the equipment communication signal matching to control the welding speed and the amount of wire fed.

[0025] As described above, the standard-specification stirring needle 7 body is first precisely installed inside a special sheath. After mechanical assembly, the system switches to manual operation mode. A high-strength aluminum alloy welding wire with a diameter of 1.2mm is precisely fed into the pre-set wire feeding hole 5 at the tail of the stirring needle 7 via a high-precision wire feeding mechanism. Once the welding wire is in place, the automated welding program is started. At this time, the PLC control system collects welding speed sensor data in real time and interacts with the wire feeding drive module in a closed loop through a digital communication interface to dynamically match the welding travel speed with the welding wire supply, ensuring that the welding wire is inserted into the welding wire stirring spiral groove 4 at a uniform speed. During the welding process, the high-speed rotating stirring needle 7 fully breaks up the welding wire material and squeezes it downwards along the welding wire stirring spiral groove 4. The welding wire metal and the base material matrix achieve atomic-level metallurgical bonding under the action of frictional heat-mechanical coupling, forming a continuous and dense weld structure. This process effectively compensates for the material loss problem caused by the mismatch in the gap of the traditional stirring needle 7 through the active filling mechanism of the welding wire. On the one hand, the filler wire process directly replenishes the metal that is easily missing at the root of the weld, eliminating the root hole defect caused by incomplete material closure; on the other hand, the continuous material input compensates for the local metal thinning caused by the rotation and extrusion of the stirring pin 7, significantly improving the load-bearing capacity of the weld area; at the same time, the intelligent signal communication between the PLC and the equipment ensures the dynamic adaptability of welding parameters, and can maintain a stable process window when dealing with different wall thicknesses and assembly gaps of the battery box.

[0026] All standard parts used in this invention can be purchased commercially, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A filler wire friction stir welding tool characterized by, Include: Device installation clamping piece (1); Limiting structure plate (2), the limiting structure plate (2) is fixedly connected at the bottom end of the device installation clamping piece (1); The stirring body (3) is installed at the bottom end of the limiting structure plate (2), the inside of the stirring body (3) is provided with a wire feeding hole (5), the inside of the wire feeding hole (5) is provided with a welding wire stirring spiral groove (4), the outside of the stirring body (3) is provided with a limiting sheath mounting seat (9), the outside of the limiting sheath mounting seat (9) is provided with a mounting threaded hole (6), the bottom end of the limiting sheath mounting seat (9) is provided with a welding wire filling stirring pressure groove (8), the bottom end of the welding wire filling stirring pressure groove (8) is provided with a stirring needle (7).

2. The filled friction stir welding tool according to claim 1, wherein: The stirring body (3) is inserted and installed in the inside of the limiting sheath mounting seat (9), the inside of the welding wire stirring spiral groove (4) is filled with welding wire.

3. The filled friction stir welding tool according to Claim 1, wherein: The mounting threaded hole (6) is inserted and arranged outside the limiting sheath mounting seat (9), the limiting sheath mounting seat (9) is a cylindrical hole groove.

4. The filled friction stir welding tool according to Claim 1, wherein: The device installation clamping piece (1) is welded at the top end of the limiting structure plate (2), the outside wall of the device installation clamping piece (1) is provided with a groove.

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