CN105195891A - Static shaft shoulder stirring head with reduced viscosity - Google Patents

Abstract

The invention discloses a static shaft shoulder viscosity-reducing stirring head, which includes a stirring needle, a shaft shoulder and a thrust ball bearing, wherein the shaft shoulder and the thrust ball bearing are sequentially connected to the rear of the stirring needle, and the rear end of the stirring needle is connected to a transmission power component Fixed connection. The rear end of the stirring needle is fixedly connected with the power transmission component by screws. The front end of the stirring needle is a conical surface, and the conical surface is provided with protrusions or pits. The stirring needle is made of H13 steel. The height of the protrusions is in the range of 0.5mm-3mm, the distance between adjacent protrusions is in the range of 0.5-3mm; the depth of the pits is in the range of 0.5-3mm, and the distance between adjacent pits is in the range of 0.5-3mm; and The included angle between the linear arrangement of the protrusions or the pits and the axis of the stirring needle is in the range of 80°-88°. Beneficial effects: the welding heat input of the static shaft shoulder viscosity-reducing stirring head is small, the overall grain size of the welding seam area is small, and the comprehensive mechanical properties of the welding seam are high. Significantly reduce the adhesion of aluminum alloy to the stirring head, make the stirring head easy to maintain after welding, and improve the service life of the stirring head.

Description

A Static Shoulder Viscosity Reducing Stirring Head

technical field

The invention relates to a stirring head, in particular to a static shoulder viscosity-reducing stirring head.

Background technique

In recent years, with the introduction and continuous innovation of high-speed rail technology, my country's high-speed rail manufacturing industry is developing vigorously. Facing the big cake of the global high-speed rail market, the competition between countries is becoming more and more fierce, and the quality and safety of high-speed rail are the prerequisites for winning orders in the competition.

For the welding of important parts of aluminum alloy medium-thick plates such as the bolster beam and coupler seat of the high-speed rail car body, most domestic enterprises still use MIG multi-layer multi-pass welding. Not only does the welding process take a long time, the working conditions of the workers are poor, and there are many defects after welding. , Difficult to repair. Compared with traditional arc welding, the friction stir welding technology has greatly improved the mechanical properties of the weld, has fewer welding defects, and greatly improved the working conditions of workers. In the welding process of the existing single-shaft stirring head, the stirring and crushing effect of the stirring on the crystal grains makes the grains in the weld nugget area very fine and has high mechanical properties. However, the stirring and crushing effect of the shoulder on the base metal is small, and the heat input generated by the friction between the shoulder and the base metal is large, which makes the grains in the thermomechanical affected zone and heat affected zone larger and the mechanical properties lower. In addition, the groove on the surface of the stirring needle after welding is easy to stick to the aluminum alloy metal, which not only affects the quality of the weld, but also makes the maintenance of the stirring head after welding with aluminum difficult, reducing the service life of the stirring head. Therefore, it is imperative to design a static shoulder viscosity-reducing stirring head.

Contents of the invention

The object of the present invention is to provide a static shoulder viscosity-reducing stirring head for solving the problem of aluminum sticking to the stirring needle in the existing single shoulder friction stir welding.

The static shoulder viscosity-reducing stirring head provided by the present invention includes a stirring needle, a shaft shoulder and a thrust ball bearing, wherein the shaft shoulder and the thrust ball bearing are sequentially connected to the rear of the stirring needle, and the rear end of the stirring needle is fixedly connected to the transmission power component.

The rear end of the stirring needle is fixedly connected with the power transmission component by screws.

The front end of the stirring needle is a conical surface, and the conical surface is provided with protrusions or pits. The stirring needle is made of H13 steel.

The height of the protrusions is in the range of 0.5mm-3mm, the distance between adjacent protrusions is in the range of 0.5-3mm; the depth of the pits is in the range of 0.5-3mm, and the distance between adjacent pits is in the range of 0.5-3mm; and The included angle between the linear arrangement of the protrusions or the pits and the axis of the stirring needle is in the range of 80°-88°.

The shoulders are manufactured from hot work die steel.

Thrust ball bearings are model numbers 51100, 51101, 51102, 51103, 51104, 51105 or 51106.

Working principle of the present invention:

The static shaft shoulder viscosity-reducing stirring head provided by the invention can be applied to the welding of high-speed rail aluminum alloy car body bolsters, coupler seats and other medium-thick plates. During the welding process, only the power transmission parts, the upper end surface of the thrust ball bearing and the stirring needle rotate And the lower end face of shaft shoulder and thrust ball bearing all does not rotate. Since the shaft shoulder does not rotate, the welding heat input will be greatly reduced, and the range of the thermomechanical affected zone and heat affected zone will be significantly reduced. The weld seam is mainly composed of the nugget area produced by the traditional single-shaft shoulder stirring head welding. Due to the stirring and crushing effect of the stirring on the grains, the grains in the weld nugget area are very fine, and the overall mechanical properties of the weld are greatly improved. In addition, the conical surface at the front end of the stirring needle is processed with protrusions or pits in the shape of a spherical crown, a cylinder, a hexagon, a square, a rectangle or a rhombus. This bionic structure can significantly reduce the adhesion of the aluminum alloy to the stirring head, which not only makes the stirring head easy to maintain after welding, but also improves the service life of the stirring head.

Beneficial effects of the present invention:

During the welding process of the static shoulder vis-reducing stirring head provided by the present invention, only the stirring needle, the upper end surface of the thrust ball bearing and the transmission power components rotate, while the shaft shoulder and the lower end surface of the thrust ball bearing do not rotate. Compared with the single-shouldered stirring head with traditional structure, under the same welding parameters, the welding heat input of this static shoulder-viscosity-reducing stirring head is smaller, the overall grain size of the weld zone is smaller, and the comprehensive mechanical properties of the weld are higher . Moreover, the conical surface of the front end of the stirring needle is processed with convex hulls or pits in the shape of a spherical crown, a cylinder, a hexagon, a square, a rectangle or a rhombus. This bionic structure can significantly reduce the adhesion of the aluminum alloy to the stirring head, which not only makes the stirring head easy to maintain after welding, but also improves the service life of the stirring head.

Description of drawings

Fig. 1 is a schematic diagram of the explosion structure of the present invention.

Fig. 2 is a schematic diagram of the installation structure of the present invention.

1. Stirring needle 2. Shaft shoulder 3. Thrust ball bearing 4. Power transmission component 5. Screw 6. Protrusion 7. Dimple.

Detailed ways

Please refer to Figure 1 and Figure 2:

The static shoulder viscosity-reducing stirring head provided by the present invention includes a stirring needle 1, a shaft shoulder 2 and a thrust ball bearing 3, wherein the shaft shoulder 2 and the thrust ball bearing 3 are connected to the rear of the stirring needle 1 in sequence, and the rear end of the stirring needle 1 It is fixedly connected with the transmission power part 4.

The rear end of the stirring needle 1 is fixedly connected with the power transmission component 4 by a screw 5 .

The front end of the stirring needle 1 is a conical surface, and the conical surface is provided with protrusions 6 or pits 7, and the stirring needle 1 is made of H13 steel.

The height of the protrusions 6 is in the range of 0.5mm-3mm, and the distance between adjacent protrusions 6 is in the range of 0.5-3mm; the depth of the pits 7 is in the range of 0.5-3mm, and the distance between adjacent pits 7 is in the range of 0.5-3mm and the angle between the linear arrangement of the protrusions 6 or the pits 7 and the axis of the stirring needle 1 is within the range of 80°-88°.

The shoulder 2 is made of hot work die steel.

The model of the thrust ball bearing 3 is 51100, 51101, 51102, 51103, 51104, 51105 or 51106.

Working principle of the present invention:

The static shaft shoulder viscosity-reducing stirring head provided by the present invention can be applied to the welding of high-speed rail aluminum alloy car body bolsters, coupler seats and other medium-thick plates. In the welding process, only the upper end surface of the power transmission component 4, the thrust ball bearing 3 and the stirring pin 1 rotates, and the lower end surface of the shaft shoulder 2 and the thrust ball bearing 3 does not rotate. Since the shoulder 2 does not rotate, the welding heat input will be greatly reduced, so that the range of the thermomechanical affected zone and the heat affected zone will be significantly reduced. The weld seam is mainly composed of the nugget zone formed by traditional single-shaft shoulder stirring head welding. Due to the stirring and crushing effect of the stirring pin 1 on the crystal grains, the grains in the weld nugget area are very fine, and the overall mechanical properties of the weld seam are greatly improved. In addition, the conical surface at the front end of the stirring needle 1 is processed with protrusions 6 or pits 7 in the shape of a spherical crown, a cylinder, a hexagon, a square, a rectangle or a rhombus. This bionic structure can significantly reduce the adhesion of the aluminum alloy to the stirring head, which not only makes the stirring head easy to maintain after welding, but also improves the service life of the stirring head.

Claims (6)

1. A static shaft shoulder viscosity-reducing stirring head is characterized in that: it includes a stirring needle, a shaft shoulder and a thrust ball bearing, wherein the shaft shoulder and the thrust ball bearing are connected to the stirring needle rear portion successively, and the rear end of the stirring needle is connected to the transmission Power components are fixedly connected. 2 . The static-shaft-shoulder viscosity-reducing stirring head according to claim 1 , characterized in that: the rear end of the stirring pin is fixedly connected with the transmission power component by screws. 3 . 3. A static shaft shoulder viscosity-reducing stirring head according to claim 1, characterized in that: the front end of the stirring needle is a conical surface, and there are protrusions or pits on the conical surface, and the stirring needle adopts H13 Made of steel. 4. A static shaft shoulder viscosity-reducing stirring head according to claim 3, characterized in that: the height of the protrusions is in the range of 0.5mm-3mm, and the distance between adjacent protrusions is in the range of 0.5-3mm ; The depth of the pits is in the range of 0.5-3mm, and the distance between adjacent pits is in the range of 0.5-3mm; and the angle between the linear arrangement of the protrusions or pits and the axis of the stirring needle is in the range of 80°-88°. 5 . The static shaft shoulder viscosity-reducing stirring head according to claim 1 , wherein the shaft shoulder is made of hot work die steel. 5 . 6. A static shoulder viscosification stirring head according to claim 1, characterized in that: the model of the thrust ball bearing is 51100, 51101, 51102, 51103, 51104, 51105 or 51106.