Axial thrust unloading mechanism for a friction welding tool

Abstract

The utility model discloses an axial thrust unloading mechanism for friction welding stir head, including motorized spindle part, bearing box part, stir head part, bearing box part input and motorized spindle part are connected, and output and stir head part are connected, and motorized spindle part drives stir head part rotation through bearing box part, bearing box part still links connecting rod part one end, and connecting rod part other end connects equipment rack, the stir head part includes clamping handle and stir head, and clamping handle one end with stir head is detachably connected, and clamping handle other end passes bearing box part and is fixedly connected with motorized spindle part, connecting rod part is at least two groups of connecting rods, and the connecting rod is arranged respectively in bearing box part both sides, the utility model discloses the bearing box through internal bearing group and accepts axial thrust, and then the thrust is transmitted to the casing of self, and then through the connecting rod of bearing box outer wall connection, and finally the thrust is transmitted to the equipment rack, realizes the complete unloading of axial thrust from bearing box to external rack.

Description

Technical Field

[0001] This utility model belongs to the field of material deformation technology, and in particular relates to an axial thrust unloading mechanism for a friction welding stirring head. Background Technology

[0002] During friction stir welding and processing (FSW / P), a continuous axial thrust is generated when the stirring head contacts the workpiece and performs stirring operations. If this axial thrust is directly borne by the electric spindle bearing, long-term action will lead to accelerated wear of precision components inside the electric spindle (such as spindle bearings and transmission structures), which will not only shorten the service life of the electric spindle but also affect its rotational accuracy, resulting in unstable weld joint quality (such as uneven weld nugget depth and joint forming defects).

[0003] Traditional solutions often rely on enhancing the rigidity of the electric spindle itself or using a single bearing to bear the thrust. However, the former increases equipment cost and size, while the latter is prone to overload failure due to the limited load-bearing capacity of a single bearing. This solution, through the design of a dedicated thrust transmission and unloading structure, transfers the axial thrust generated by the stirring head from the electric spindle to an external independent load-bearing system, achieving "zero axial thrust load-bearing" during electric spindle operation, thus ensuring equipment accuracy and service life. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An axial thrust unloading mechanism for a friction welding stirring head includes an electric spindle, a bearing housing, and a stirring head. The input end of the bearing housing is connected to the electric spindle, and the output end is connected to the stirring head. The electric spindle drives the stirring head to rotate through the bearing housing. The bearing housing is also hinged to one end of a connecting rod, and the other first end of the connecting rod is connected to the equipment frame. The stirring head includes a clamp and a stirring head. One end of the clamp is detachably connected to the stirring head, and the other end of the clamp passes through the bearing housing and is fixedly connected to the electric spindle. The connecting rod section comprises at least two sets of connecting rods, which are respectively located on both sides of the bearing housing section.

[0005] Furthermore, the bearing housing includes a bearing housing body and an end cap that matches the bearing housing body. The bearing housing body is provided with at least four sets of bearing elements, namely a first bearing element, a second bearing element, a third bearing element, and a fourth bearing element. The four sets of bearing elements can respectively support bidirectional axial force and radial force.

[0006] Furthermore, the stirring head also includes a collet and a locking buckle. The locking buckle is an elastic buckle, and rotating the collet can clamp the locking buckle inward, thereby fixing the stirring head.

[0007] Furthermore, the stirring head also includes a connecting bolt, one end of which is connected to the electric spindle and the other end is connected to the clamp.

[0008] Furthermore, the first and fourth bearing elements are thrust roller bearings, and the second and third bearing elements are tapered roller bearings, with the two sets of tapered roller bearings arranged opposite each other in the axial force direction.

[0009] Furthermore, the bearing housing is provided with a pin hole, and the connecting rod is rotatably hinged to the pivot hole via the pin.

[0010] The beneficial effects of this utility model are: The axial thrust generated by the stirring head of this invention is first transmitted to the front end of the electric spindle connected to it, and then directly acts on the thrust roller bearing and tapered roller bearing in the bearing housing. The two sets of bearings jointly bear the entire axial thrust, realizing the "separation of thrust from the electric spindle to the bearing set", thus avoiding damage to the electric spindle bearing due to axial force. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 This is a cross-sectional schematic diagram of the bearing housing of this utility model; Figure 4 This is an exploded view of the stirring head of this utility model; Explanation of reference numerals in the attached figures: 1. Electric spindle section; 2. Bearing housing section; 21. First bearing element; 22. Second bearing element; 23. Third bearing element; 24. Fourth bearing element; 25. Bearing housing; 26. End cap; 3. Connecting rod section; 4. Stirring head; 41. Clamp handle; 42. Stirring head; 43. Rotary collet; 44. Lock; 45. Connecting bolt. Detailed Implementation

[0013] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention. Specific Implementation Example 1: like Figures 1 to 4 As shown, an axial thrust unloading mechanism for a friction welding stirring head includes an electric spindle 1, a bearing housing 2, and a stirring head 4. The input end of the bearing housing 2 is connected to the electric spindle 1, and the output end is connected to the stirring head 4. The electric spindle 1 drives the stirring head 4 to rotate through the bearing housing 2. The bearing housing 2 includes a bearing housing body 25 and an end cap 26 that matches the bearing housing body 25. The bearing housing body 25 is provided with a pin hole 27, and the connecting rod is rotatably hinged to the pin hole 27 through a pin. The bearing housing body 25 is provided with at least four sets of bearing elements, namely a first bearing element 21, a second bearing element 22, a third bearing element 23, and a fourth bearing element 24. The four sets of bearing elements can respectively support bidirectional axial force and radial force. The first bearing element 21 and the fourth bearing element 24 are thrust roller bearings, and the second bearing element 22 and the third bearing element 23 are tapered roller bearings. The two sets of tapered roller bearings are arranged opposite each other in the axial force direction.

[0015] The stirring head 4 includes a handle 41 and a stirring head 42. One end of the handle 41 is detachably connected to the stirring head, and the other end of the handle 41 passes through the bearing housing 2 and is fixedly connected to the electric spindle 1. The stirring head 4 also includes a collet 43 and a latch 44. The latch 44 is an elastic latch; rotating the collet 43 can clamp the latch 44 inward, thereby fixing the stirring head 42. The stirring head 4 also includes a connecting bolt 45, one end of which is connected to the electric spindle 1, and the other end is connected to the handle 41.

[0016] The bearing housing 2 is also hinged to one end of the connecting rod 3, and the other first end of the connecting rod 3 is connected to the equipment frame; the connecting rod 3 consists of at least two sets of connecting rods, which are respectively located on both sides of the bearing housing 2.

[0017] The axial thrust F1 generated by the stirring head is transmitted to the thrust roller bearing and tapered roller bearing in the shaft box through mechanical contact. The two sets of bearings share the load of F1, and the electric spindle does not contact F1. The axle box converts F1 into a force F2 on the housing, which is then transmitted to the frame via the connecting rod to complete the thrust unloading. Throughout the process, the electric spindle only bears the radial force generated by its own rotation (which is negligible), without any axial thrust, thus achieving the design goal of "not bearing axial thrust during operation".

[0018] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An axial thrust unloading mechanism for a friction welding stirring head, characterized in that: It includes an electric spindle (1), a bearing housing (2), and a stirring head (4). The input end of the bearing housing (2) is connected to the electric spindle (1), and the output end is connected to the stirring head (4). The electric spindle (1) drives the stirring head (4) to rotate through the bearing housing (2). The bearing housing (2) is also hinged to one end of a connecting rod (3), and the other end of the connecting rod (3) is connected to the equipment frame. The stirring head (4) includes a handle (41) and a stirring head (42). One end of the handle (41) is detachably connected to the stirring head, and the other end of the handle (41) passes through the bearing housing (2) and is fixedly connected to the electric spindle (1). The connecting rod section (3) consists of at least two sets of connecting rods, which are respectively located on both sides of the bearing housing section (2).

2. The axial thrust unloading mechanism for a friction welding stirring head according to claim 1, characterized in that: The bearing housing (2) includes a bearing housing (25) and an end cap (26) that matches the bearing housing (25). The bearing housing (25) is provided with at least four sets of bearing elements, namely a first bearing element (21), a second bearing element (22), a third bearing element (23), and a fourth bearing element (24). The four sets of bearing elements can respectively support bidirectional axial force and radial force.

3. The axial thrust unloading mechanism for a friction welding stirring head according to claim 1, characterized in that: The stirring head (4) also includes a collet (43) and a latch (44). The latch (44) is an elastic latch. Rotating the collet (43) can clamp the latch (44) inward, thereby fixing the stirring head (42).

4. The axial thrust unloading mechanism for a friction welding stirring head according to claim 3, characterized in that: The stirring head (4) also includes a connecting bolt (45), one end of which is connected to the electric spindle (1), and the other end is connected to the clamp (41).

5. The axial thrust unloading mechanism for a friction welding stirring head according to claim 2, characterized in that: The first bearing element (21) and the fourth bearing element (24) are thrust roller bearings, and the second bearing element (22) and the third bearing element (23) are tapered roller bearings. The two sets of tapered roller bearings are arranged opposite each other in the axial force direction.

6. The axial thrust unloading mechanism for a friction welding stirring head according to claim 2, characterized in that: The bearing housing (25) is provided with a pin hole (27), and the connecting rod is rotatably hinged to the pin hole (27) through a pin.

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