Spacing-adjustable friction stir welding double-shaft-shoulder stirring head

Abstract

The utility model discloses a friction stir welding double-shaft-shoulder stirring head with an adjustable distance, which relates to the technical field of friction welding and comprises a stirring needle, an upper shoulder shaft and a lower shoulder shaft, the upper shoulder shaft is mounted on the outer side of one end of the stirring needle, and a connecting end is mounted on the outer side of the upper shoulder shaft; the connecting base is connected with the other end of the stirring needle, and a plurality of fixing columns are installed on the side, facing the upper shoulder shaft, of the connecting base; and the lower shoulder shaft is slidably connected to the outer side of the stirring needle, at least one hydraulic assembly is installed between the lower shoulder shaft and the connecting base, and a plurality of sliding grooves are formed in the side, facing the connecting base, of the lower shoulder shaft. After the lower shaft shoulder is assembled, the lower shaft shoulder can be adjusted through the hydraulic assembly between the lower shaft shoulder and the connecting base, and the lower shaft shoulder slides along the stirring needle during adjustment, so that the distance between the lower shaft shoulder and the upper shoulder shaft is changed, and the lower shaft shoulder can be suitable for welding materials with different thicknesses.

Description

Technical Field

[0001] The utility model relates to the technical field of friction welding, in particular to a friction stir welding double-shaft shoulder stirring head with adjustable spacing. Background Art

[0002] Friction stir welding is a solid-state welding technology that uses a high-speed rotating stirring head to insert into the joint of the materials to be welded. The heat generated by the rotating friction is used to make the material reach a plastic state, and then the weld is formed through stirring and material flow.

[0003] The stirring head is the core tool of friction stir welding, which usually includes a single-axis shoulder and a double-axis shoulder. The double-axis shoulder stirring head has two shoulders (upper shoulder and lower shoulder) to ensure that the upper and lower surfaces of the material are evenly heated and plastically deformed during the welding process.

[0004] A Chinese patent (publication number: CN212264865U) discloses a multi-shouldered, double-telescopic friction stir welding stirring head. The patent includes a handle and a head. The bottom surface of the handle forms a first axially upward mounting hole, and the bottom surface of the handle forms a first lower shoulder. The head includes an upper head and a lower head. The top surface of the upper head extends axially upward to form an upper stirring needle with a reduced diameter. The upper stirring needle can be telescopically inserted and fixed in the first mounting hole. The top surface of the upper head forms an upper shoulder. The bottom surface of the upper head forms a second axially upward mounting hole, and the bottom surface of the upper head forms a second lower shoulder.

[0005] In the prior art, the lower shoulder needs to be in contact with the lower surface of the welding material to provide frictional heat and pressure to ensure that the lower surface material is fully heated and plastically deformed like the upper surface material. Therefore, when welding materials of different thicknesses, the distance of the lower shoulder needs to be easily adjusted to improve applicability. The utility model proposes a stir friction welding double-shoulder stirring head with adjustable spacing. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a stir friction welding double-axis shoulder stirring head with adjustable spacing, which solves the problem.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a double-shaft shoulder stirring head for friction stir welding with adjustable spacing, comprising a stirring needle, an upper shoulder shaft and a connecting base respectively mounted at both ends of the stirring needle, a connecting end mounted on the outer side of the upper shoulder shaft, and a lower shoulder shaft mounted on the side of the connecting base facing the upper shoulder shaft via at least one set of hydraulic components;

[0008] The upper shoulder shaft, the stirring needle and the lower shoulder shaft are coaxially distributed, and the connecting end is connected to the power output part of the stir friction welding device to drive the upper shoulder shaft, the stirring needle and the lower shoulder shaft to rotate coaxially;

[0009] During operation, the lower shoulder shaft can be adjusted to move along the stirring needle through the hydraulic assembly, thereby changing the distance between the upper shoulder shaft and the lower shoulder shaft, and the lower shoulder shaft can better contact the lower surface of the welding material.

[0010] Preferably, a plurality of sliding grooves are provided on the side of the lower shoulder shaft facing the connection base;

[0011] A plurality of fixing columns are installed on the side of the connecting base facing the lower shoulder shaft;

[0012] The distribution positions and sizes of the plurality of fixing posts correspond to the distribution positions and sizes of the sliding slots, and each fixing post is slidably connected to a group of sliding slots.

[0013] Preferably, a cavity is provided in the fixing column, one side of the bottom end of the cavity is connected to the outside, and the connecting portion is provided between the gap between the lower shoulder shaft and the connecting base;

[0014] When the fixed column slides along the sliding groove, air compression between the sliding groove and the fixed column is avoided.

[0015] Preferably, the lower shoulder shaft is located on the outer side of the hydraulic assembly and is provided with a structural groove;

[0016] The hydraulic assembly includes a piston rod and a hydraulic pipe;

[0017] The bottom end of the hydraulic pipe is connected to the connection base, and the hydraulic pipe is slidably connected to the corresponding structural groove;

[0018] The top of the piston column is connected to the corresponding structural groove, and the bottom of the piston column is embedded in the corresponding hydraulic pipe. A piston part is provided at the bottom of the piston column, and a sealing assembly is provided on the outside of the piston part for sealing with the inner wall of the hydraulic pipe.

[0019] Preferably, a plurality of elastic members are installed between the connecting base and the lower shoulder shaft, which are used to cooperate with the piston column and the hydraulic pipe to support and limit the lower shoulder shaft and the connecting base.

[0020] Preferably, a cavity is provided in the lower shoulder shaft for sleeve-mounting the lower shoulder shaft on the outside of the stirring pin and sliding along the stirring pin;

[0021] A side groove is provided on the inner side of one end of the cavity facing away from the connection base, and a rubber ring is installed inside the side groove to seal the sliding part of the lower shoulder shaft and the stirring needle to prevent debris and impurities generated during welding from entering the sliding part of the lower shoulder shaft and the stirring needle.

[0022] Beneficial effects

[0023] The utility model provides a friction stir welding dual-shaft shoulder stirring head with adjustable spacing. Compared with the existing technology, it has the following advantages:

[0024] After assembly, the lower shoulder of the utility model can be adjusted by the hydraulic assembly connected to the base. During adjustment, it slides along the stirring needle, thereby changing the distance between it and the upper shoulder shaft, thereby being suitable for welding materials of different thicknesses.

[0025] Furthermore, the utility model can stably provide friction heat and pressure to the lower side of the welding material through the hydraulic assembly during welding, so that the lower side of the welding material is fully heated and plastically deformed, thereby improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the utility model;

[0027] Figure 2 This is a schematic diagram of the connection structure of the upper shoulder shaft, connecting base, lower shoulder shaft and stirring needle in the utility model;

[0028] Figure 3 It is a cross-sectional view of the lower shoulder shaft in the utility model.

[0029] In the figure: 1. stirring needle; 2. upper shoulder shaft; 3. connecting base; 4. lower shoulder shaft; 5. connecting end; 6. hydraulic assembly; 7. sliding groove; 8. fixed column; 9. side groove; 61. piston column; 62. hydraulic pipe; 63. elastic part. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-3 The utility model provides a technical solution: a double-shaft shoulder stirring head for stir friction welding with adjustable spacing, comprising a stirring needle 1, an upper shoulder shaft 2 and a connecting base 3 respectively mounted on both ends of the stirring needle 1, a connecting end 5 mounted on the outer side of the upper shoulder shaft 2, in this embodiment, a plurality of communicating threaded holes are provided between the upper shoulder shaft 2 and the connecting end 5, during assembly, the threaded holes in the upper shoulder shaft 2 are aligned with the threaded holes in the connecting end 5 respectively, and are assembled and fixed with fixing bolts, and a lower shoulder shaft 4 is mounted on the side of the connecting base 3 facing the upper shoulder shaft 2 through a plurality of hydraulic components 6;

[0032] The upper shoulder shaft 2, the stirring needle 1 and the lower shoulder shaft 4 are coaxially distributed, and the connecting end 5 is connected to the power output part of the friction stir welding device to drive the upper shoulder shaft 2, the stirring needle 1 and the lower shoulder shaft 4 to rotate coaxially;

[0033] During operation, the lower shoulder shaft 4 can be moved along the stirring needle 1 by adjusting the hydraulic assembly 6, thereby changing the distance between the upper shoulder shaft 2 and the lower shoulder shaft 4, and the lower shoulder shaft 4 can better contact the lower surface of the welding material.

[0034] See also Figure 2 , a plurality of sliding grooves 7 are opened on the side of the lower shoulder shaft 4 facing the connection base 3;

[0035] A plurality of fixing columns 8 are installed on one side of the connecting base 3 facing the lower shoulder shaft 4;

[0036] The distribution positions and sizes of the plurality of fixing posts 8 correspond to the distribution positions and sizes of the sliding slots 7 , and each fixing post 8 is slidably connected to a group of sliding slots 7 .

[0037] A cavity is provided in the fixing column 8, one side of the bottom end of the cavity is connected to the outside, and the connecting portion is provided between the gap between the lower shoulder shaft 4 and the connecting base 3;

[0038] When the fixed post 8 slides along the sliding groove 7 , air compression between the sliding groove 7 and the fixed post 8 is avoided.

[0039] The lower shoulder shaft 4 is located on the outside of the hydraulic assembly 6 and has a structural groove;

[0040] The hydraulic assembly 6 includes a piston rod 61 and a hydraulic pipe 62;

[0041] The bottom end of the hydraulic pipe 62 is connected to the connection base 3, and the hydraulic pipe 62 is slidably connected to the corresponding structural groove;

[0042] The top of the piston column 61 is connected to the corresponding structural groove, and the bottom of the piston column 61 is embedded in the corresponding hydraulic pipe 62. A piston part is provided at the bottom of the piston column 61, and a sealing assembly is provided on the outside of the piston part for sealing with the inner wall of the hydraulic pipe 62.

[0043] A plurality of elastic members 63 are installed between the connecting base 3 and the lower shoulder shaft 4 to cooperate with the piston column 61 and the hydraulic pipe 62 to support and limit the lower shoulder shaft 4 and the connecting base 3 .

[0044] The hydraulic pipe 62 is connected to the external liquid supply component, and its connection method and structure can adopt any mature solution in the existing technology. After the liquid supply component inputs the hydraulic oil between the piston part at the bottom of the piston column 61 and the hydraulic pipe 62, it cooperates with the elastic part 63 to fix the position of the lower shoulder shaft 4 and provide stable pressure when the lower shoulder shaft 4 contacts the lower surface of the welding material.

[0045] See also Figure 3 A cavity is provided in the lower shoulder shaft 4 for sleeve-mounting the lower shoulder shaft 4 on the outside of the stirring needle 1 and sliding along the stirring needle 1;

[0046] A side groove 9 is provided on the inner side of one end of the cavity facing away from the connection base 3, and a rubber ring is installed inside the side groove 9 to seal the sliding part of the lower shoulder shaft 4 and the stirring needle 1 to prevent debris and impurities generated during welding from entering the sliding part of the lower shoulder shaft 4 and the stirring needle 1.

[0047] While working:

[0048] First, assemble the rubber ring from the cavity of the lower shoulder shaft 4 to the side groove 9, and then assemble the lower shoulder shaft 4 from the bottom end of the stirring needle 1 until the connecting base 3 and the bottom of the stirring needle 1 are fixed;

[0049] Subsequently, the hydraulic oil is supplied to the hydraulic pipe 62 by the hydraulic supply assembly. The lower shoulder shaft 4 moves based on the piston rod 61 according to the amount of hydraulic oil supplied. When the lower shoulder shaft 4 moves, the elastic members 63 are stretched. When the amount of hydraulic oil supplied decreases, the elastic members 63 return the lower shoulder shaft 4 to its original position.

[0050] When the lower shoulder shaft 4 moves, the cavity inside it slides along the stirring needle 1, and each sliding groove 7 inside it slides along the corresponding fixed column 8. When the fixed column 8 slides along the sliding groove 7, the air between the fixed column 8 and the sliding groove 7 is discharged along the cavity inside the fixed column 8;

[0051] During operation, the lower shoulder shaft 4 applies pressure to the lower surface of the welding material through the top based on the hydraulic assembly 6 inside the lower shoulder shaft 4 .

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] 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 friction stir welding double-shouldered stirring head with adjustable spacing, comprising a stirring needle (1), characterized in that: An upper shoulder shaft (2) is mounted on the outer side of one end of the stirring needle (1); A connecting base (3) is connected to the other end of the stirring needle (1), and a plurality of fixing columns (8) are installed on the side of the connecting base (3) facing the upper shoulder shaft (2); A lower shoulder shaft (4) is slidably connected to the outside of the stirring needle (1), and at least one set of hydraulic components (6) is installed between the lower shoulder shaft (4) and the connecting base (3), and a plurality of sliding grooves (7) are formed on a side of the lower shoulder shaft (4) facing the connecting base (3); Each fixed column (8) is slidably connected to a group of sliding grooves (7).

2. The distance-adjustable friction stir welding dual-shoulder stirring head according to claim 1, characterized in that: The fixing column (8) is provided with a cavity, one side of the bottom end of the cavity is connected to the outside, and the connecting portion of the cavity is provided between the gap between the lower shoulder shaft (4) and the connecting base (3).

3. The distance-adjustable friction stir welding dual-shoulder stirring head according to claim 1, characterized in that: The lower shoulder shaft (4) is located on the outer side of the hydraulic assembly (6) and is provided with a structural groove; The hydraulic assembly (6) includes a piston rod (61) and a hydraulic pipe (62); The bottom end of the hydraulic pipe (62) is connected to the connection base (3), and the hydraulic pipe (62) is slidably connected to the corresponding structural groove; The top of the piston column (61) is connected to the corresponding structural groove, and the bottom of the piston column (61) is embedded in the corresponding hydraulic pipe (62), and the bottom of the piston column (61) is provided with a piston part, and a sealing component is provided on the outside of the piston part.

4. The distance-adjustable friction stir welding dual-shoulder stirring head according to claim 3, characterized in that: A plurality of elastic members (63) are installed between the connecting base (3) and the lower shoulder shaft (4).

5. The distance-adjustable friction stir welding dual-shoulder stirring head according to claim 1, characterized in that: A cavity is provided in the lower shoulder shaft (4); A side groove (9) is provided on the inner side of one end of the cavity facing away from the connection base (3), and a rubber ring is installed inside the side groove (9).

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