A special friction stir welding tool for CNC machining center

Abstract

The utility model relates to the technical field of friction welding, and discloses a special friction stir welding tool for a CNC machining center, wherein the stirring end includes a shoulder shaft, and a stirring head is provided at the bottom end of the shaft of the shoulder shaft, and the bottom friction surface of the stirring head is an inner concave surface, and the edge of the inner concave surface is provided with internal threads arranged along its circumference, and a stirring needle is provided in the middle of the inner concave surface, and the needle body surface of the stirring needle is provided with stirring threads. The friction stir welding tool for a CNC machining center of the utility model adjusts the morphology of the traditional friction stir welding tool shoulder, and adjusts the original inner concave and concentric ring style to a combination of inner concave and spiral grooves, and under the matching combination of the spiral stirring needle, it has a more excellent and adaptive friction stir welding performance, greatly reduces the defect rate, and the welding surface molding effect is better than that of the traditional friction stir welding tool, increases the service life of the stirring head, and reduces the equipment investment cost.

Description

Technical Field

[0001] The utility model relates to the technical field of friction welding, in particular to a special friction stirring welding tool for a CNC machining center. Background Art

[0002] Friction welding refers to a welding method that uses the heat generated by the friction between the contact surfaces of the workpieces as a heat source to cause the workpieces to undergo plastic deformation under pressure. Compared with traditional fusion welding, friction welding has the advantages of high quality welded joints, which can achieve weld strength equal to that of the base material, high welding efficiency, stable quality, good consistency, and can realize welding of dissimilar materials.

[0003] With the continuous promotion and application of friction stir welding (FSW) technology, more and more mechanical parts are fixed by friction welding. Due to the diversity of mechanical parts, manufacturers usually need to purchase special friction stir welding equipment, but the high cost is not cost-effective. Therefore, many manufacturers usually directly use CNC for friction stir welding. However, CNC is not like friction stir welding equipment, which has no welding inclination angle. Therefore, the special friction stir welding tools on the market are all equipped with special equipment, and there is no friction stir welding tool specially used for CNC machining center, which leads to poor welding and unstable welding in friction welding. To this end, the technicians in this field provide a special friction stir welding tool for CNC machining center to solve the problems raised in the above background technology. Utility Model Content

[0004] The main purpose of the utility model is to provide a special friction stir welding tool for a CNC machining center, which can effectively solve the problems of poor welding and unstable welding in the existing friction stir welding tools for CNC machining centers in the background technology.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a special friction stir welding tool for a CNC machining center, comprising a stirring end and a clamping end that are mutually buckled and installed, and two sets of clamping sleeves that are symmetrically clamped on the mating ends of the stirring end and the clamping end;

[0006] The stirring end comprises a shoulder shaft, a stirring head is arranged at the bottom end of the shaft of the shoulder shaft, the bottom friction surface of the stirring head is an inner concave surface, the edge of the inner concave surface is arranged with internal threads along its circumference, and a stirring needle is arranged in the middle of the inner concave surface, and the needle body surface of the stirring needle is provided with stirring threads;

[0007] The clamping end comprises a clamping shaft, the bottom end of the shaft of the clamping shaft is provided with a flat push slot, and the top end of the shaft of the shoulder shaft is provided with a flat push buckle which is horizontally aligned with the flat push slot.

[0008] As a further solution of the utility model: the concave angle of the concave surface of the stirring head is between 6° and 10°.

[0009] As a further solution of the utility model: the internal thread is a double spiral groove or a triple spiral groove.

[0010] As a further solution of the present invention: the stirring needle is a truncated cone structure, and the root of the stirring needle is in the form of an excessive rounded corner.

[0011] As a further solution of the utility model: the horizontal push buckle and the horizontal push slot are both L-shaped structures, and the stirring end and the clamping end are connected in one piece through the horizontal push buckle and the horizontal push slot.

[0012] As a further solution of the utility model: the top end of the shaft of the shoulder shaft is symmetrically provided with a limit slot A, and the bottom end of the shaft of the clamping end is symmetrically provided with a limit slot B aligned with the limit slot A;

[0013] The middle part of the clamping sleeves of the two groups of clamping sleeves is provided with a limiting buckle matched with the limiting slot A and the limiting slot B.

[0014] As a further solution of the utility model: the two groups of clamping sleeves are integrally screwed and fixed by tightening bolts installed on both sides of the shaft sleeves.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The friction stir welding tool for CNC machining center of the utility model adjusts the shoulder shape of the traditional friction stir welding tool from the original concave and concentric ring style to a combination of concave and spiral grooves. In combination with the spiral stirring needle, it has more excellent and suitable friction stir welding performance, greatly reduces the defect rate, and the welding surface forming effect is better than that of the traditional friction stir welding tool, which increases the service life of the stirring head and reduces the equipment investment cost.

[0017] The friction stir welding tool for a CNC machining center has good disassembly and assembly performance. The friction stir welding tool in an assembled form is formed by utilizing the horizontal clamping of the stirring end and the clamping end and utilizing the clamping sleeve to vertically clamp the mating end of the stirring end and the clamping end. After the stirring head of the subsequent stirring end is scrapped, only the stirring end needs to be disassembled and replaced without disassembling and replacing the overall structure, thereby reducing the manufacturing and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a special friction stir welding tool for a CNC machining center of the utility model;

[0019] Figure 2 This is a first explosion diagram of a friction stir welding tool for a CNC machining center of the utility model;

[0020] Figure 3 This is the second explosion diagram of a special friction stir welding tool for a CNC machining center of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of a stirring end in a friction stir welding tool dedicated to a CNC machining center of the utility model;

[0022] Figure 5 The utility model is a structural schematic diagram of a clamping end in a special friction stir welding tool for a CNC machining center.

[0023] In the figure: 1. Stirring end; 11. Shoulder shaft; 12. Limiting slot A; 13. Push buckle; 14. Stirring head; 15. Internal thread; 16. Stirring needle; 17. Stirring thread; 2. Clamping end; 21. Clamping shaft; 22. Limiting slot B; 23. Pushing slot; 3. Clamping sleeve; 4. Tightening bolt; 5. Limiting buckle. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figure 1-5As shown, a special friction stir welding tool for a CNC machining center comprises a stirring end 1 and a clamping end 2 which are mounted with a snap fit, and two sets of clamping sleeves 3 which are symmetrically sleeved on the mating ends of the stirring end 1 and the clamping end 2. The stirring end 1 comprises a shoulder shaft 11, and a stirring head 14 is arranged at the bottom end of the shaft of the shoulder shaft 11. The bottom friction surface of the stirring head 14 is an inner concave surface, and the edge of the inner concave surface is arranged with an internal thread 15 along its circumferential direction. The inner concave angle of the inner concave surface of the stirring head 14 is between 6° and 10°, and the internal thread 15 is a double spiral groove or a triple spiral groove. By setting the friction surface of the stirring head 14 to an inner concave surface form and arranging the inner thread 15 with a double spiral groove or a triple spiral groove around the inner concave surface, the stirring head 14 has a more excellent rotational friction performance, can improve the CNC friction stir welding effect and the service life of the friction stir welding tool, reduce the instability caused by the reversal work process of the CNC machining center, and improve the compatibility with the CNC machining center.

[0028] A stirring needle 16 is arranged in the middle of the inner concave surface, and a stirring thread 17 is arranged on the needle surface of the stirring needle 16. The stirring needle 16 is a truncated cone structure, and the root of the stirring needle 16 is in an excessively rounded form. By setting the stirring thread 17 of the stirring needle 16 to a left-hand spiral and setting its root to an excessively rounded form, its stirring performance is faster and more stable, which can reduce the wear caused by hard friction and increase the service life of the stirring head.

[0029] The clamping end 2 includes a clamping shaft 21, and a flat push slot 23 is provided at the bottom end of the shaft of the clamping shaft 21, and a flat push buckle 13 is provided at the top end of the shaft of the shoulder shaft 11 for horizontally engaging with the flat push slot 23. Both the flat push buckle 13 and the flat push slot 23 are L-shaped structures, and the stirring end 1 and the clamping end 2 are integrally connected through the flat push buckle 13 and the flat push slot 23. Based on the flat push buckle of the flat push buckle 13 and the flat push slot 23, the stirring end 1 and the clamping end 2 are assembled as a whole in a sub-assembly form. After the stirring head of the stirring end 1 is scrapped, it is only necessary to disassemble and assemble the stirring end 1 without disassembling and assembling the overall structure from the CNC machining center equipment, which reduces the replacement strength while reducing the manufacturing cost.

[0030] The top end of the shaft of the shoulder shaft 11 is symmetrically provided with a limit slot A12, and the bottom end of the shaft of the clamping end 2 is symmetrically provided with a limit slot B22 aligned with the limit slot A12. The middle part of the sleeves of the two sets of clamping sleeves 3 are provided with limit buckles 5 matched with the limit slot A12 and the limit slot B22. The two sets of clamping sleeves 3 are integrally screwed and fixed by tightening bolts 4 installed on both sides of their sleeves. After the stirring end 1 and the clamping end 2 are spliced ​​and assembled, the two sets of clamping sleeves 3 are clamped at the matching end positions of the stirring end 1 and the clamping end 2, and the limit buckle 5 is adapted to the buckles of the two sets of limit slots to integrally clamp and limit the stirring end 1 and the clamping end 2, and then the matching tightening bolts 4 are screwed and fixed on the clamping sleeve 3.

[0031] The working principle of the utility model is as follows: when the friction stir welding tool is assembled in one piece in the CNC machining center, the stirring end 1 and the clamping end 2 are assembled in one piece in the form of subassembly based on the flat push buckle 13 and the flat push slot 23, and then the two sets of clamping sleeves 3 are clamped at the matching end positions of the stirring end 1 and the clamping end 2, and the limiting buckle 5 is adapted to the buckles of the two sets of limiting slots to limit and fix the stirring end 1 and the clamping end 2 in one piece, and then the matching tightening bolt 4 is screwed and fixed on the clamping sleeve 3, so that it can form an integrated friction welding tool, and after the stirring head of the stirring end 1 is scrapped, it is only necessary to disassemble the stirring end 1 without disassembling the overall structure from the CNC machining center equipment;

[0032] When the friction welding tool is used later, its clamping end 2 is installed on the driving end of the CNC machining center equipment, and the friction surface in the form of the inner concave surface of the stirring head 14 and the inner thread 15 with double spiral grooves or triple spiral grooves arranged around the inner concave surface are used to provide more excellent rotational friction performance, which can improve the CNC friction stir welding effect and the service life of the friction stir welding tool, reduce the instability caused by the reverse working process of the CNC machining center, and improve the compatibility with the CNC machining center. In addition, by arranging a left-handed spiral stirring thread 17 on the stirring needle 16 and setting an excessive fillet at its root, its stirring performance is faster and more stable, which can reduce the wear caused by hard friction and increase the service life of the stirring head;

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A special friction stir welding tool for CNC machining center, characterized in that: It comprises a stirring end (1) and a clamping end (2) which are mounted in a mutually buckled manner, and two sets of clamping sleeves (3) which are symmetrically clamped on the mating ends of the stirring end (1) and the clamping end (2); The stirring end (1) comprises a shoulder shaft (11), a stirring head (14) is arranged at the bottom end of the shaft of the shoulder shaft (11), the bottom friction surface of the stirring head (14) is an inner concave surface, the edge of the inner concave surface is provided with internal threads (15) arranged along its circumference, and a stirring needle (16) is arranged in the middle of the inner concave surface, and the needle body surface of the stirring needle (16) is provided with stirring threads (17); The clamping end (2) comprises a clamping shaft (21), the bottom end of the shaft of the clamping shaft (21) is provided with a horizontal push slot (23), and the top end of the shaft of the shoulder shaft (11) is provided with a horizontal push buckle (13) which is horizontally aligned with the horizontal push slot (23).

2. A friction stir welding tool for a CNC machining center according to claim 1, characterized in that: The concave angle of the inner concave surface of the stirring head (14) is between 6° and 10°.

3. A friction stir welding tool for CNC machining center according to claim 1, characterized in that: The internal thread (15) is a double helical groove or a triple helical groove.

4. The friction stir welding tool for CNC machining center according to claim 1, characterized in that: The stirring needle (16) is a truncated cone-shaped structure, and the root of the stirring needle (16) is in the form of an excessively rounded corner.

5. The friction stir welding tool for CNC machining center according to claim 1, characterized in that: The horizontal push buckle (13) and the horizontal push slot (23) are both L-shaped structures, and the stirring end (1) and the clamping end (2) are integrally connected via the horizontal push buckle (13) and the horizontal push slot (23).

6. The friction stir welding tool for CNC machining center according to claim 1, characterized in that: The top end of the shaft of the shoulder shaft (11) is symmetrically provided with a limit slot A (12), and the bottom end of the shaft of the clamping end (2) is symmetrically provided with a limit slot B (22) aligned with the limit slot A (12); The middle part of the clamping sleeves of the two sets of clamping sleeves (3) is provided with a limiting buckle (5) which is matched with the limiting slot A (12) and the limiting slot B (22).

7. The friction stir welding tool for CNC machining center according to claim 1, characterized in that: The two sets of clamping sleeves (3) are integrally screwed and fixed via tightening bolts (4) installed on both sides of the shaft sleeves.

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