JPH02299784A - Friction welding method - Google Patents

Abstract

PURPOSE:To prevent the generation of incomplete penetration and defective joining and to perform sure and efficient friction welding by rotating the axial center of rotation of a member to be joined while shifting it by the desired distance with respect to the axial center of rotation of the other member to be joined. CONSTITUTION:A motor 5 is rotated in a state with the members 15 and 16 to be joined located at a distance and when it attains the prescribed rotating speed, the member 16 to be joined is moved in the left direction and brought into contact with the member 15 to be joined by a pressurizing cylinder 6. In the early stage, the members 15 and 16 to be joined are brought into contact with each other so that the axial centers of these members are brought in line with each other. Welding is performed while adjusting the axial center of the member 16 to be joined by adjusting cylinders 6 and 8 so as to generate uniform frictional heat on the whole of joining faces. The axial center of the member 16 to be joined is adjusted so as to be displaced to two from one, to three from two, to four from three, to one from four. By this method, the whole of joining faces is heated uniformly and the generation of incomplete penetration and defective joining is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to friction welding used for joining tools such as drills and reamers, gears, shafts, pump shafts, etc., and in particular, to prevent welding defects peculiar to friction welding. The present invention relates to a friction welding method that can efficiently perform reliable pressure welding by preventing such problems.

In friction welding, the joint surfaces of base materials are brought together and rotated, and the rotation l! that occurs at the joint is generated. ! 't = A method of pressure welding using heat; the range of heat influence during bonding is narrow, the mechanical properties of the joint are good, pressure welding is possible even between dissimilar metals, or dimensional accuracy is possible. Because of its advantages such as high corrosion resistance, it is often used to join various mechanical elements.

2. Description of the Related Art Conventional friction welding involves the use of a plurality of systems to be welded coaxially arranged. (
are fixed with bearings, and one or both bearings are rotated to impart rotational motion to the materials, and a hydraulic cylinder or the like applies pressure between the materials to heat and press them together.

Problems to be Solved by the Present Invention In the above-mentioned problems, poor weld penetration occurs on the joint surfaces, especially near the axis of the materials to be joined, and the entire joint is not heated uniformly, resulting in partial alloying. There was a problem in that poor bonding occurred without any change in temperature. This is because the materials are rotated on the same axis during pressure welding, so frictional heat due to rotation is not generated uniformly over the joint surface. In other words, when materials are rotated on the same axis, almost no frictional heat is generated at the axis, but on the contrary, the rotational speed increases as the distance from the axis increases, and more frictional heat is generated. If poor penetration or poor bonding occurs, the mechanical strength of the bonded surface will be extremely reduced, the yield will be high, and productivity will be reduced.

Therefore, a technical object of the present invention is to provide a reliable and efficient friction welding method that prevents the occurrence of poor penetration and poor joining.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to abut and rotate the joint surfaces of a plurality of joint members,
In a method of pressure welding using frictional heat generated on joint surfaces, the rotational axis of at least one of the plurality of joining members is shifted by a desired distance with respect to the rotational axis of the other joining members. It is characterized by including a rotating process.

By rotating the working joint member by shifting it by a desired distance without rotating it on the same axis, it is possible to generate almost no frictional heat at the axial center or generate polynomial frictional heat as it moves away from the axial center. Frictional heat is generated almost uniformly over the entire joint surface.

Effects of the Invention According to the present invention, the entire joint surface can be pressure-welded with almost uniform frictional heat, and there is no problem of poor penetration near the axis.
It is possible to perform reliable and efficient friction welding without causing a partial joint failure on the joint surface.

EXAMPLE An example showing a specific example of the present invention will be described (see FIG. 1 and FIG. 2).

Holding bearing for holding joining member 15.16] 7°18,
An electric motor 5 that applies rotational motion to the joining member 15, a hydraulic pressure cylinder 6 that applies pressing force to the joining member 15, 16, and a hydraulic adjustment cylinder 7° that adjusts the axis of the holding bearing 1B. Friction welding is performed using 8. The rotation of the electric motor 5 is transmitted to the joining member 15 via the transmission belt 10. The joining member 15.16 is the holding bearing 17.18
It is held by the jack part 11.12. Adjustment cylinder 7
．． 8 are arranged perpendicularly to each other and also orthogonally to the holding bearing 18, so that the axis of the holding bearing 18 can be adjusted as desired. 13 is a damper for absorbing the movement of the axis of the holding bearing 18.

As shown in FIG. 1, the electric motor 5 is rotated with the joining members 15, 16 separated. When the joining member 15 reaches a predetermined rotational speed, the joining member 16 is moved leftward by the pressure cylinder 6 and brought into contact with the joining member 15. In the initial stage, contact is made so that the axes of the joining members 15 and 16 are aligned.

FIG. 2 is an enlarged view of the bonding surface of the bonding member 15. Initially, the bonding member 16 is brought into contact so that its axis 1 is aligned with the axis of the bonding member 15. The pressurizing force of the joining members 15, 16 is appropriately adjusted by the pressurizing cylinder 6. Pressure welding is performed after adjusting the axis of the joining member 16 with the Isobushi cylinder 7°8 so that uniform frictional heat is generated over the entire joining surface. (Second
As shown in the figure, the axis of the joining member 16 is adjusted so as to be displaced from 1 to 2, from 2 to 3, from 3 to 4, and from 4 to 1. ) By suitably adjusting the axis of the joining member 16, the entire joining surface is heated uniformly, and poor penetration and poor joining do not occur.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is an enlarged view of a main part in FIG. 1. 5: Electric motor 6: Pressure cylinder 7.8: Adjustment cylinder 15.16: Joint member 17.18: Holding bearing

Claims (1)

[Claims] 1. In a method in which the joint surfaces of a plurality of joint members are abutted and rotated, and the frictional heat generated on the joint surfaces is used for pressure welding, the rotation axis of at least one joint member among the plurality of joint members is A friction welding method comprising the step of rotating a joining member while shifting it by a desired distance with respect to the rotational axis.