A friction stir welding tail hole structure

Abstract

The utility model discloses a kind of stir friction welding tail hole structures, including body and water-cooled plate, the body is provided with multiple reinforcing ribs, multiple the reinforcing rib is formed with water cavity with the water-cooled plate, the body and the water-cooled plate welding connection and form tail hole at welding retraction, reinforcing rib is set in the front surface of welding place Threaded hole, the water-cooled plate is set boss at the reverse of welding place, the boss can be embedded in the threaded hole. The utility model adds boss and threaded hole, makes tail hole position (retraction point) deviate weld, so that its weld forms a closed area, does not destroy the sealing property of weld, satisfies the performance and functional requirement of part after welding.

Description

Technical Field

[0001] This utility model relates to the friction stir welding (FSW) process for the three-electric system of new energy vehicles, specifically a friction stir welding tail hole structure. Background Technology

[0002] This part connects two water-cooled plates and the main body together using the FSW process. After the water-cooled plates and the main body are welded, a cavity is created in the middle. This cavity is used to circulate the coolant, so after welding, the welded position must be 100% connected and there must be no leakage.

[0003] However, due to the specific welding method and welding trajectory, leakage is prone to occur at the tail hole position. The retraction point (tail hole) stays on the weld, which damages the weld structure, affects the integrity of the weld, affects the airtightness of the part, and causes the part to leak.

[0004] Due to product structure limitations, the tail hole can only be placed on the weld, forming the weakest point of the entire part, which greatly increases the difficulty of welding and the risk of leakage. Utility Model Content

[0005] To address the shortcomings of the existing technology, this invention provides a tail hole structure for friction stir welding. This invention adds a boss and a countersunk hole, offsetting the tail hole position (retraction point) from the weld, so that the weld forms a closed area without compromising the weld's sealing performance, thus meeting the performance and functional requirements of the welded parts.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solution: a tail hole structure for friction stir welding, comprising a body and a water-cooled plate, wherein the body is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs and the water-cooled plate form a water cavity, the body and the water-cooled plate are welded together and a tail hole is formed at the welding retraction point, the reinforcing ribs are provided with countersunk holes on the front side of the welding point, and the water-cooled plate is provided with bosses on the back side of the welding point, the bosses being able to be embedded in the countersunk holes.

[0007] The depth of the countersunk hole is 3 mm.

[0008] The height is 3mm, the length is 6mm, and the width is 4mm.

[0009] In summary, this utility model achieves the following technical effects: This invention combines the current part structure with the process characteristics of FSW (Free Welding), offsetting the tail hole position (retraction point) from the weld seam. A process platform is added to the cooling plate and the main body. During welding, the tool retracts onto the process platform, not onto the weld seam, forming a closed area and preserving the weld's seal, thus meeting the performance and functional requirements of the welded part. Because the welded part is a lap weld, the part itself already has significant limitations, making it impossible to use better welding processes, increasing the difficulty and making the process harder to control. Therefore, this application does not change the welding process but uses the addition of a boss and countersunk hole to offset the tail hole position (retraction point) from the weld seam. Attached Figure Description

[0010] Figure 1 This is a front view of the water-cooled plate and the main body connected together using the FSW process; Figure 2 It corresponds to the previous structure. Figure 1 A sectional view; Figure 3 yes Figure 2 Enlarged portion A; Figure 4 This is the structure corresponding to this application. Figure 1 A sectional view; Figure 5 yes Figure 4 Enlarged diagram of section B; Figure 6 It is a top view of the main body; Figure 7 This is a bottom view of the water-cooled plate. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to the accompanying drawings.

[0012] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0013] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0017] Example: A tail hole structure for friction stir welding includes a body 1 and a water-cooled plate 2. The body 1 is provided with multiple reinforcing ribs, which together with the water-cooled plate 2 form a water cavity 11. The body 1 and the water-cooled plate 2 are welded together and a tail hole is formed at the welding retraction point. The reinforcing ribs are provided with countersunk holes 12 on the front side of the welding point, and the water-cooled plate 2 is provided with bosses 21 on the back side of the welding point. The bosses 21 can be embedded in the countersunk holes 12.

[0018] Specifically, Figure 1 This is a front view of the water-cooled plate 2 and the main body 1 connected together using the FSW process. Figure 2 It corresponds to the previous structure. Figure 1 sectional view, Figure 3 yes Figure 2The enlarged schematic diagram of part A shows that the water-cooled plate 2 and the main body 1 are welded together by a mixer 3. When the mixer 3 retracts, it leaves a tail hole at the end position (the hole left after the lower end of the mixer 3 retracts). The tail hole is close to the water cavity, forming a weak point. The cooling water in the water cavity will leak outward from the weld (weak point) (tail hole), causing leakage.

[0019] Figure 4 This is the structure corresponding to this application. Figure 1 sectional view, Figure 5 yes Figure 4 The enlarged schematic diagram of part B shows that this utility model adds a boss 21 and a countersunk hole 12 at the retraction position, which are correspondingly embedded to... Figure 3 The weld shown descends from the lower end of mixer 3 to... Figure 5 At the countersunk hole 12 shown, the position of the mixer 3 remains unchanged, and the weld position is pulled down a certain distance, thereby increasing the distance between the water cavity 11 and the tail hole, reducing the impact of water flow in the water cavity on the tail hole, and preventing leakage.

[0020] Figure 6 This is a top view of the main body, and the depth of the countersunk hole 12 is 3mm.

[0021] Figure 7 This is a bottom view of the water-cooled plate. The boss 21 has a height of 3mm, a length of 6mm, and a width of 4mm.

[0022] This invention modifies the structure of the parts by creating a boss on the water-cooling plate and a countersunk hole on the main body. The two work together, and after welding, the tail hole remains on the boss, offsetting the weld seam, which can avoid potential quality problems caused by the tail hole.

[0023] Before the structural adjustment, the product had a high risk of quality and leakage. After the adjustment in this application, the leakage risk can be resolved, the quality risk can be reduced, and the yield rate can be improved. This invention optimizes the welding strength and improves the bonding quality by adjusting the structure of the part and the FSW process.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A tail hole structure for friction stir welding, comprising a body (1) and a water-cooled plate (2), wherein the body (1) is provided with a plurality of reinforcing ribs, the plurality of reinforcing ribs and the water-cooled plate (2) forming a water cavity (11), the body (1) and the water-cooled plate (2) are welded together and a tail hole is formed at the welding retraction point, characterized in that: The reinforcing rib has a countersunk hole (12) on the front side of the weld, and the water-cooled plate (2) has a boss (21) on the back side of the weld, and the boss (21) can be embedded in the countersunk hole (12).

2. The tail hole structure for friction stir welding according to claim 1, characterized in that: The depth of the countersunk hole (12) is 3 mm.

3. The tail hole structure for friction stir welding according to claim 1, characterized in that: The boss (21) has a height of 3mm, a length of 6mm, and a width of 4mm.

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