CN213969484U

CN213969484U - Static shaft shoulder friction stir welding tool

Info

Publication number: CN213969484U
Application number: CN202022268741.1U
Authority: CN
Inventors: 李继忠; 张标
Original assignee: Foxway Welding Technology Shanghai Co ltd
Current assignee: Fosway Technology (Jiashan) Co.,Ltd.
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-08-17
Anticipated expiration: 2030-10-13

Abstract

The utility model discloses a quiet shoulder friction stir welding instrument relates to the welding technology field. The device comprises a stirring head, a first bearing, a second bearing, a bearing retainer ring, a bearing fastener and a fixed shaft shoulder sleeve; 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, retaining ring and second bearing are installed on the bearing installation department in proper order, first bearing and second bearing adopt back to back or face-to-face combination mode installation, the bearing fastener is installed and is carried on spacingly in order being used for to first bearing and second bearing on the bearing fastener installation department, the dead axle shoulder cover is equipped with interior cylinder, interior cylinder and the outer cylinder interference fit installation of first bearing and second bearing. The utility model provides a pair of bearing and dead axle shoulder friction stir welding instrument can be convenient when realizing that the welding seam does not have to reduce and thin and do not have overlap, guarantees the gyration precision of bearing, and then improves stability and the life-span that the instrument used.

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 line thinning and flash, but because the static shaft shoulder friction stir welding tool has a relatively complex structure and works in a high-temperature environment for a long time, when the static shaft shoulder friction stir welding tool works for a long time, the problems of reduction of rotation precision, deterioration of welding precision and obvious reduction of service life are easy to occur, how to improve the uneven stress of the static shaft shoulder friction stir welding tool and ensure the rotation precision of the static shaft shoulder friction stir welding tool is of great significance for improving the precision and the service life of the static shaft shoulder friction stir 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 bearing and quiet shoulder friction stir welding instrument for quiet shoulder friction stir welding instrument, can conveniently realize that the welding seam does not have to reduce thin and do not have the overlap in, guarantees the gyration precision of bearing, and then stability and the life-span that the improvement instrument used.

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

a static shaft shoulder friction stir welding tool comprises a stirring head, a first bearing, a second bearing, a bearing retainer ring, a bearing fastener and a static shaft shoulder sleeve; the stirring head is provided with a step positioning surface, a bearing mounting part and a bearing fastener mounting part, the step positioning surface is used for positioning the first bearing, the bearing mounting part is used for mounting the first bearing, the bearing retainer ring and the second bearing, the first bearing and the second bearing are sequentially mounted on the bearing mounting part, the first bearing and the second bearing are mounted in a back-to-back or face-to-face combination mode, the bearing fastener is mounted on the bearing fastener mounting part and used for limiting the first bearing and the second bearing, the static shaft shoulder sleeve is provided with an inner cylindrical surface, and the inner cylindrical surface is mounted with outer cylindrical surfaces of the first bearing and the second bearing in an interference fit mode;

the first bearing and the second bearing respectively comprise an outer ring, an inner ring, a roller, a retainer and a sealing cover, an accommodating space is formed between the outer ring and the inner ring and the sealing cover, the roller and the retainer are arranged in the accommodating space between the outer ring and the inner ring, the retainer is provided with a pocket hole, the roller is assembled in the pocket hole, and the accommodating space is filled with graphite powder for lubrication; the outer circumference of the inner ring is provided with two annular grooves, one end of the sealing cover is provided with a bending part, the bending part is inserted into the annular grooves, the annular grooves are filled with high-temperature-resistant lubricating grease for lubrication and sealing, the other end of the sealing cover is coiled into a ring-shaped structure, the inner circumference of the outer ring is provided with a semicircular groove matched with the ring-shaped structure, and the other end of the sealing cover is embedded into the semicircular groove.

Optionally, the roller is one of a cylindrical roller, a needle roller, and a tapered roller.

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 is in clearance fit with the axle shoulder, and the diameter difference between the dead axle shoulder hole and the axle 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.

The utility model provides a pair of quiet shoulder friction stir welding instrument owing to adopted the lubricated bearing of graphite powder, has effectively improved the lubricated effect under the high temperature condition, improves the stability and the instrument life-span of welding process. It is through setting up sealed lid between outer lane and inner circle for form the accommodation space with sealed lid between outer lane and the inner circle, and pack in the accommodation space and be used for lubricated graphite powder, make the graphite powder can keep good lubrication action and effect under the high temperature state at the bearing, thereby guarantee the gyration precision that adopts the quiet shoulder friction stir welding instrument of this bearing, improve the stability and the life-span that the instrument used, and then improve production efficiency.

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 bearing for the static shoulder friction stir welding tool of FIG. 1;

FIG. 3 is a cross-sectional schematic view of a stationary shoulder sleeve for use with the stationary shoulder friction stir welding tool of FIG. 1;

fig. 4 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. 3 is a cross-sectional schematic view of a stationary shoulder sleeve for use with the stationary shoulder friction stir welding tool of FIG. 1. Fig. 4 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 4. 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 first bearing 2 and the second bearing 4 are both bearings as described above. And the inside of the first bearing 2 and the second bearing 4 is lubricated at high temperature by adopting encapsulated graphite powder. Because the graphite powder used for lubrication is filled in the accommodating space, the graphite powder can keep good lubrication and effect under the high-temperature state of the bearing, the rotation precision of the static shaft shoulder friction stir welding tool adopting the bearing is ensured, the use stability and the service life of the tool are improved, and the production efficiency is further improved.

As shown in fig. 2, each of the first bearing 2 and the second bearing 4 may include an outer ring 101, an inner ring 102, rollers 104, a cage 105, and a seal cover 103. An accommodating space is formed between the outer ring 101 and the inner ring 102 and the sealing cover 103. The rollers 104 and the cage 105 are disposed in the accommodation space between the outer ring 101 and the inner ring 102. The cage 105 is provided with pockets in which the rollers 104 are fitted. The roller 104 is one of a cylindrical roller, a needle roller, and a tapered roller. The accommodating space is filled with graphite powder for lubrication. Because the graphite powder has the effect of high temperature resistance, can make the utility model discloses a bearing still can keep good lubricated effect under the high temperature condition. Optionally, the graphite powder filled in the accommodating space is nano-scale graphite powder so as to have better lubricating effect.

Specifically, the outer circumferential surface of the inner race 102 is provided with two annular grooves 106. One end of the sealing cover 103 is provided with a bending part 108, the bending part 108 is inserted into the annular groove 106, and the annular groove 106 is filled with high-temperature grease for lubrication and sealing. Therefore, the graphite powder is sealed in the accommodating space between the outer ring 101 and the inner ring 102 through the high-temperature-resistant lubricating grease, and the graphite powder is prevented from overflowing. In addition, during the operation of the bearing, the sealing cover 103 rotates synchronously with the outer ring 101, and in the annular groove 106, the bent part 108 is not in direct contact with the inner ring 102, but is isolated by high temperature grease and plays a lubricating role, so that the friction force when the sealing cover 103 rotates is reduced. The other end of the sealing cover 103 is coiled into a ring-shaped structure 109, the inner circular surface of the outer ring 101 is provided with a semicircular groove matched with the ring-shaped structure 109, and the ring-shaped structure 109 at the other end of the sealing cover 103 is embedded into the semicircular groove. In an alternative embodiment, the semicircular grooves can be filled with high-temperature grease for isolation and sealing.

Specifically, the stirring 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 utility model provides a pair of quiet shoulder friction stir welding instrument owing to adopted the lubricated bearing of graphite powder, has effectively improved the lubricated effect under the high temperature condition, improves the stability and the instrument life-span of welding process.

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; the stirring head is provided with a step positioning surface, a bearing mounting part and a bearing fastener mounting part, the step positioning surface is used for positioning the first bearing, the bearing mounting part is used for mounting the first bearing, the bearing retainer ring and the second bearing, the first bearing and the second bearing are sequentially mounted on the bearing mounting part, the first bearing and the second bearing are mounted in a back-to-back or face-to-face combination mode, the bearing fastener is mounted on the bearing fastener mounting part and used for limiting the first bearing and the second bearing, the static shaft shoulder sleeve is provided with an inner cylindrical surface, and the inner cylindrical surface is mounted with outer cylindrical surfaces of the first bearing and the second bearing in an interference fit mode;

2. The static shoulder friction stir welding tool of claim 1 wherein said roller is one of a cylindrical roller, a needle roller, a tapered roller.

3. The friction stir welding tool of claim 2 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.

4. A static shoulder friction stir welding tool as set forth in claim 3 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.

5. 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.

6. 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.

7. 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.

8. The static shoulder friction stir welding tool of claim 7, 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.

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