CN213410783U

CN213410783U - Static shaft shoulder friction stir welding tool

Info

Publication number: CN213410783U
Application number: CN202022267521.7U
Authority: CN
Inventors: 李继忠; 张标
Original assignee: Foxway Welding Technology Shanghai Co ltd
Current assignee: Foxway Welding Technology Shanghai Co ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-06-11
Anticipated expiration: 2030-10-13

Abstract

The utility model discloses a quiet shoulder friction stir welding instrument relates to the welding technology field. Including the stirring head, first bearing and second bearing, the retaining ring, bearing fastener and quiet shaft shoulder cover, the stirring head is equipped with the step locating surface that is used for fixing a position first bearing, bearing installation department and bearing fastener installation department, first bearing, the retaining ring is installed on the bearing installation department with the second bearing in proper order, first bearing and second bearing adopt back to back or face-to-face combination mode installation, the bearing fastener is installed in order to be used for carrying on spacingly to first bearing and second bearing on the bearing fastener installation department, quiet shaft shoulder cover is equipped with the inner cylinder face, the outer cylinder face interference fit installation of inner cylinder face and first bearing and second bearing. The utility model provides a pair of quiet shoulder friction stir welding instrument can improve its atress inequality, guarantee its gyration precision, improves welding instrument's precision and life.

Description

Static shaft shoulder friction stir welding tool

Technical Field

The utility model relates to the field of welding technique, especially, relate to a quiet shoulder friction stir welding instrument.

Background

Friction Stir Welding (FSW) is a new solid phase joining technique invented in 1991 by The Welding Institute, TWI. The process is that a stirring head consisting of a shaft shoulder and a stirring needle is inserted into a welding seam and moves forwards while rotating at a high speed, materials to be welded are plasticized by utilizing friction heat, plastic flow is generated under the driving of the stirring head, the welding seam is formed under the forging and pressing action of the shaft shoulder, and solid-phase connection is realized.

The stirring head is a core component of friction stir welding, provides heat required by material plasticization in the welding process through friction with workpieces, and is a carrier for directional material flow in a welding seam area. In the friction stir welding process, due to the rotation and extrusion of the stirring head, plastic materials in the welding line can overflow out of the welding line area to form 'flash', so that the welding line area is slightly thinner than the base metal, and the surface quality and the joint performance of the welding line are not facilitated. At present, in industrial production, mechanical polishing is often needed to remove flash, so that the production efficiency is reduced, and the surface quality of a welded workpiece is easily damaged.

The design and manufacture of the stirring head are key technologies for realizing friction stir welding, and related mechanisms at home and abroad carry out a great deal of research on the aspects of shape design, material selection, processing technology and the like of the stirring head. At present, there are two main ways to eliminate flash: firstly, designing the end surface of a shaft shoulder of a special stirring head, and firstly, changing the end surface of the shaft shoulder of the stirring head; secondly, a device or a structure is additionally arranged on the stirring head, for example, a cutting head or the outer edge of a shaft shoulder is added to be processed into a cutting groove. However, both methods do not eliminate the burrs well, and the first method can reduce the amount of the burrs but cannot completely eliminate the burrs, and the second method causes poor weld surface quality due to the adhesion of the burrs to the stirring head due to the high temperature of the burrs. The static shaft shoulder friction stir welding tool and the method thereof can solve the problems of weld thinning and flash, but the radial stress of the static shaft shoulder sleeve is uneven due to the existence of the inclination angle and the advancing resistance of a stirring head in the welding process, so that the end face circle of the static shaft shoulder sleeve is not concentric with a stirring pin, and the rotation precision is reduced. How to improve the uneven stress of the welding tool and ensure the rotation precision of the welding tool has important significance for improving the precision of the welding tool and prolonging the service life of the welding tool.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model discloses a main aim at provides a quiet shoulder friction stir welding instrument can improve its atress inequality, guarantee its gyration precision, improves welding instrument's precision and life.

In order to achieve the above purpose, the technical solution of the present invention is as follows:

the utility model provides a quiet shoulder friction stir welding instrument, includes stirring head, first bearing and second bearing, retaining ring, bearing fastener and quiet shoulder cover, the stirring head is equipped with and is used for the location step locating surface, bearing installation department and the bearing fastener installation department of first bearing, retaining ring and second bearing are installed in proper order on the bearing installation department, first bearing with the second bearing adopts back to back or face-to-face combination mode to install, the bearing fastener install in it is right to be used for on the bearing fastener installation department first bearing and second bearing carry on spacingly, quiet shoulder cover is equipped with the inner cylinder face, the inner cylinder face with the outer face of cylinder interference fit installation of first bearing and second bearing.

Optionally, the first bearing and the second bearing are both angular contact bearings, tapered roller bearings or deep groove ball bearings.

Optionally, an inner positioning surface is arranged in the dead axle shoulder sleeve, and the inner positioning surface is in close contact with the end surface of the second bearing.

Optionally, the length of the bearing mounting portion is no greater than the sum of the lengths of the first bearing, the bearing retainer ring and the second bearing.

Optionally, the bearing fastener mounting portion is provided with a threaded formation for mounting a bearing fastener.

Optionally, the stirring head is further provided with a clamping handle for clamping the stirring head, and a clamping face convenient for clamping the stirring head is arranged on the clamping handle.

Optionally, the mixing head is further provided with a shaft shoulder for eliminating flash and a mixing needle arranged on the shaft shoulder, the static shaft shoulder is sleeved with a static shaft shoulder hole, and the shaft shoulder penetrates through the static shaft shoulder hole.

Optionally, the dead axle shoulder hole and the shaft shoulder are in clearance fit, and the diameter difference between the dead axle shoulder hole and the shaft shoulder is 0.05-0.5 mm.

Optionally, the shaft shoulder penetrates through and extends out of the dead shaft shoulder hole by 0.1-0.8 mm.

Optionally, the end face of the shaft shoulder is a plane, a concave shape or a spiral line structure.

The utility model provides a pair of quiet shoulder friction stir welding instrument is through being equipped with step locating surface, bearing installation department and the bearing fastener installation department that is used for fixing a position first bearing at the stirring head, first bearing, bearing retainer ring and second bearing are installed in proper order on the bearing installation department, first bearing with the second bearing adopts back to back or face-to-face combination mode to install, the bearing fastener install in order being used for on the bearing fastener installation department right first bearing and second bearing carry on spacingly to better axial force and the radial force who bears the welding process guarantee the gyration precision of instrument in the welding process, improve the stability and the instrument life of welding process.

The utility model provides a pair of quiet shoulder friction stir welding instrument has following advantage:

1. the generation of flash can be effectively avoided in the welding process, and a high-quality welding seam with a smooth surface is obtained;

2. the end face of the dead axle shoulder sleeve is extruded, so that the welding seam material is extruded into the welding seam as much as possible, the welding seam thinning is reduced or avoided, and the mechanical property of the joint is improved;

3. the axial force and the radial force in the welding process are better borne, the rotation precision of the tool in the welding process is ensured, the stability in the welding process is improved, and the service life of the tool is prolonged;

4. the welding process has no flash, the surface of the welding seam is smooth, the manual polishing process is reduced, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is an exploded schematic view of a static shoulder friction stir welding tool according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a stationary shoulder sleeve of a stationary shoulder friction stir welding tool according to FIG. 1;

fig. 3 is a schematic structural diagram of a static shoulder friction stir welding tool provided by an embodiment of the present invention after assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 is an exploded schematic view of a static shoulder friction stir welding tool according to an embodiment of the present invention. FIG. 2 is a cross-sectional schematic view of a stationary shoulder sleeve of a stationary shoulder friction stir welding tool according to FIG. 1. Fig. 3 is a schematic structural diagram of a static shoulder friction stir welding tool provided by an embodiment of the present invention after assembly. A static shoulder friction stir welding tool according to the present invention will be described in detail with reference to fig. 1 to 3. The utility model discloses a quiet shoulder friction stir welding instrument, generally, can include stirring head 1, first bearing 2 and second bearing 4, retaining ring 3, bearing fastener 5 and quiet shoulder cover 6. The mixing head 1 is provided with a step positioning surface 11 for positioning the first bearing 2, a bearing mounting portion 12 and a bearing fastener mounting portion 13. When assembled, the first bearing 2, the retainer ring 3, and the second bearing 4 are mounted on the bearing mounting portion 12 in this order. One end of the first bearing 2 far away from the second bearing 4 is abutted against the step positioning surface 11. The first bearing 2 and the second bearing 4 are installed in a back-to-back or face-to-face combination mode, so that the axial upsetting force in the welding process and the radial force generated by the inclination angle and the advancing resistance are borne by the combination of the first bearing 2 and the second bearing 4, the back-to-back or face-to-face combination mode can better bear the axial force and the radial force in the welding process, the rotation precision of a tool in the welding process is guaranteed, and the stability in the welding process and the service life of the tool are improved. The bearing fastener 5 is mounted on the bearing fastener mounting portion 13. The bearing fastener 5 is used for limiting the first bearing 2 and the second bearing 4 and preventing the first bearing 2 and the second bearing 4 from moving. The length of the bearing mounting part 12 is not more than the sum of the lengths of the first bearing 2, the bearing retainer 3 and the second bearing 4, so that the bearing fastener 5 can be ensured to be screwed on the bearing fastener mounting part 13 to limit the axial movement of the bearing. The bearing fastener 5 is assembled without interfering with the inner cavity of the dead axle shoulder sleeve 6. The static shaft shoulder sleeve 6 is provided with an inner cylindrical surface 61, and the inner cylindrical surface 61 and the outer cylindrical surfaces (21 and 41) of the first bearing 2 and the second bearing 4 are installed in an interference fit mode, so that when the stirring head 1 drives the shaft shoulder 16 and the stirring needle 17 to rotate in the welding process, the static shaft shoulder sleeve 6 is in a static non-rotating state.

Specifically, each of the first bearing 2 and the second bearing 4 may employ any one of an angular contact bearing, a tapered roller bearing, or a deep groove ball bearing. The outer diameters of the first bearing 2 and the second bearing 4 are slightly larger than the diameter of the inner cylindrical surface 61 of the stationary shaft shoulder sleeve 6, so that the first bearing 2 and the second bearing 4 are in interference fit after being assembled. The interference fit can be installed by the principle of expansion with heat and contraction with cold.

Further, an inner positioning surface 62 is arranged in the dead axle shoulder sleeve 6. After assembly, the inner positioning surface 62 is in close contact with the end surface 42 of the second bearing 4, so that the static shaft shoulder sleeve 6 can be more firmly and tightly mounted with the first bearing 2 and the second bearing 4, and the service life is prolonged.

In a particular embodiment, the bearing fastener mounting portion 13 is provided with a threaded configuration for mounting the bearing fastener 5. Corresponding threads are arranged in the bearing fastening piece 5, so that the bearing fastening piece 5 is screwed and installed.

In a particular embodiment, the pin 1 is further provided with a clamping handle 14 for clamping the pin 1. The clamping handle 14 is provided with a clamping surface 15 which is convenient for clamping the stirring head 1. The arrangement of the clamping handle 14 and the clamping surface 15 enables the static shoulder friction stir welding tool to be conveniently installed on a workbench.

In another specific embodiment, as shown in fig. 2 and 3, the dead axle shoulder sleeve 6 is provided with a dead axle shoulder hole 63. The shaft shoulder 16 is arranged in the dead shaft shoulder hole 63 in a penetrating way. The dead axle shoulder hole 63 is in clearance fit with the shaft shoulder 16, and the diameter difference between the dead axle shoulder hole 63 and the shaft shoulder 16 is 0.05-0.5 mm. The length of the dead axle shoulder hole end face 64, through which the shaft shoulder 16 penetrates and extends out of the dead axle shoulder hole 63, is 0.1-0.8 mm. The design can extrude the welding seam material into the welding seam as much as possible through the extrusion effect of the end surface of the shaft shoulder 16 of the static shaft shoulder sleeve 6, thereby reducing or avoiding the thinning of the welding seam, improving the mechanical property of the joint, effectively avoiding the generation of flash and obtaining the high-quality welding seam with smooth surface. Optionally, the end surface of the shoulder 16 is planar, concave or helical.

The utility model provides a pair of quiet shoulder friction stir welding instrument, each part of its welding instrument installation matches each other, and duplex bearing combination inner circle is fixed good on stirring head 1, and bearing inner race and quiet shoulder cover 6 are fixed good, have guaranteed the relative position of shaft shoulder terminal surface with quiet shoulder terminal surface to and stirring head shoulder diameter is even for clearance fit with quiet shoulder hole, improves welding instrument's among the welding process gyration precision.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A static shaft shoulder friction stir welding tool is characterized by comprising a stirring head, a first bearing, a second bearing, a bearing retainer ring, a bearing fastener and a static shaft shoulder sleeve, wherein the stirring head is provided with a step positioning surface, a bearing mounting part and a bearing fastener mounting part which are used for positioning the first bearing; the first bearing and the second bearing are both one of an angular contact bearing, a tapered roller bearing or a deep groove ball bearing.

2. The friction stir welding tool of claim 1 wherein said stationary shoulder sleeve has an inner locating surface disposed therein, said inner locating surface being in intimate contact with an end surface of said second bearing.

3. A static shoulder friction stir welding tool as set forth in claim 1 wherein said bearing mounting portion has a length no greater than the sum of the lengths of said first bearing, said retainer ring and said second bearing.

4. A static shoulder friction stir welding tool as set forth in claim 1 wherein said bearing fastener mounting portion is provided with a threaded formation for mounting a bearing fastener.

5. The static shoulder friction stir welding tool of claim 1 wherein said tool head further comprises a clamping shank for clamping said tool head, said clamping shank having a clamping surface for facilitating clamping of said tool head.

6. The static shoulder friction stir welding tool of claim 1, wherein the pin tool further comprises a shoulder for flash elimination and a pin tool disposed on the shoulder, the static shoulder is sleeved with a static shoulder hole, and the shoulder is inserted into the static shoulder hole.

7. The static shoulder friction stir welding tool of claim 6, wherein said static shoulder bore is clearance fit with said shoulder, and the diameter difference between said static shoulder bore and said shoulder is 0.05-0.5 mm.

8. The static shoulder friction stir welding tool of claim 6, wherein said shoulder extends through and beyond said static shoulder hole by 0.1-0.8 mm.

9. A friction stir welding tool as set forth in claim 6 wherein said shoulder end surface is planar, concave or helical.