JPH0663775A - Method for joining annular member and shaft member - Google Patents

Abstract

PURPOSE:To firmly join both members by friction welding by forming a plane part over the total length of axial direction that an end surface total of a shaft member is abutted on the outer circumferential surface of an annular member. CONSTITUTION:In the case of joining an end surface of a shaft member 2 to the outer circumferential surface of an annular member 1 by the friction welding method, a pair of plane parts 1a, 1a where the end surface total of the shaft member 2 is abutted and the phase difference is 180 degree is preliminarily formed over the total length of axial direction on the outer circumferential surface of the annular member 1. This plane parts 1a, 1a are formed by the drawing method at the time of manufacturing the annular member 1. In such a way, the annular member 1 is positioned and fixed a fixing jig 3. Therefore, the strong joint of the annular member 1 and the shaft member 2 can be obtaned by the remarkably simple and inexpensive method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining an annular member and a shaft-like member by using a friction welding method.

[0002]

2. Description of the Related Art Welding is well known as a conventional method for joining objects together, but in welding, welding defects such as blowholes occur and the dimensional accuracy decreases due to thermal strain. However, there are problems such as the need for pre-welding processes such as groove and spigot, the inability to join dissimilar metals and non-ferrous metals, and sparks and gas generation.

Therefore, in recent years, as a method for joining objects, a friction joining method has been developed in which frictional heat energy generated when objects are frictionally brought into contact with each other is effectively used and the objects are joined together by applying higher pressure. Has been done.

In the joining of the annular member and the shaft-shaped member by the friction joining method, as shown in FIG. 3, the end surface 2a of the shaft-shaped member 2 is subjected to a constant pressure against the outer peripheral surface of the fixed annular member 1. And a friction heating step in which the shaft-shaped member 2 is rotated as indicated by an arrow M in that state, and in the friction heating step, the temperature of the contact surface between the two rises due to friction heat, and a high temperature layer is formed between them. After the rotation of the shaft-shaped member 2 is suddenly stopped at the time point where the
It is supposed to be performed by an upset pressurizing step of joining the two by pressing (that is, upset pressure).

[0005]

As described above, when the annular member 1 and the shaft member 2 are joined by the friction joining method, the end face of the shaft member 2 is pressed against the outer peripheral surface of the annular member 1. Therefore, depending on the relationship between the outer diameter D of the annular member 1 and the outer diameter d of the shaft-shaped member 2, sufficient contact between the end surface of the shaft-shaped member 2 and the outer peripheral surface of the annular member 1 cannot be obtained. Occurs, a heating effect can be obtained in a portion where they are in contact with each other, but a cooling action is exerted in a portion where they are not in contact with each other, resulting in insufficient joint strength.

Therefore, it has been conventionally desired to set the ratio of the outer diameter D of the annular member 1 to the outer diameter d of the shaft-shaped member 2 to 5: 1 or more. Therefore, when determining the product shape as a component obtained by friction welding, the constraint of D / d ≧ 5 is imposed, and there is a problem that the degree of freedom of the product shape cannot be obtained.

In order to eliminate the above-mentioned problems, it is conceivable to preliminarily process the annular member 1 or the shaft-shaped member 2 as shown in FIGS.

In the case of the method shown in FIG. 4, only the end portion on the joining side of the shaft-shaped member 2 having the outer diameter d ₁ (d ₁ > d) is cut to have the outer diameter d. In this case, there is a problem that additional processing is required for the shaft-shaped member 2 and the strength of the joint portion is reduced with respect to the strength of the shaft-shaped member 2.

In the case of the method shown in FIG. 5, a convex portion 1a having an outer diameter d of the shaft-shaped member 2 is integrally formed on the outer periphery of the annular member 1, and the annular member 1 is used in this case. When manufacturing, a casting method or the like must be adopted, which causes a problem of cost increase.

The present invention has been made in view of the above points, and it is an object of the present invention to make it possible to firmly join an annular member and a shaft-like member by using a friction joining method by an extremely simple and low-cost method. It is intended.

[0011]

In the present invention, as a method for solving the above-mentioned problems, in joining the end surface of the shaft-shaped member to the outer peripheral surface of the annular member by friction welding, the outer periphery of the annular member is A flat surface portion with which the entire end surface of the shaft-shaped member can come into contact is previously formed on the surface over the entire axial length.

[0012]

In the present invention, the following actions are obtained by the above method.

That is, when the annular member is manufactured, the flat portion can be easily formed on the outer peripheral surface of the annular member and the wall pressure of the annular member can be easily adjusted only by adopting the drawing method or the cold forging method. .

[0014]

According to the present invention, when the end surface of the shaft-shaped member is joined to the outer peripheral surface of the annular member by the friction welding method, the entire end surface of the shaft-shaped member contacts the outer peripheral surface of the annular member. Since the flat part that can contact is preformed over the entire length in the axial direction, the desired annular member shape can be obtained by simply adopting the drawing method or the cold forging method when manufacturing the annular member. It is easy to control the wall pressure of the member, and there is an excellent effect that extremely strong frictional joining can be obtained without performing additional processing on the material unlike the conventional example.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the case of this embodiment, as shown in FIGS. 1 and 2, when the end surface of the shaft-shaped member 2 is joined to the outer peripheral surface of the annular member 1 by the friction welding method, the annular member 1 is used.
A pair of flat surface portions 1a, 1a with which the entire end surface of the shaft-shaped member 2 can come into contact with the outer peripheral surface are formed in advance over the entire axial length with a phase difference of 180 °.

The flat portions 1a, 1a are formed by forming the annular member 1
It is carried out by adopting a drawing method or a cold forging method when manufacturing the. That is, by devising the cross-sectional shape of the die used when manufacturing the annular member 1, the flat surface portions 1a, 1a can be obtained without additional processing.

The annular member 1 obtained as described above is positioned and fixed by the fixing jig 3, but at this time, it can be positioned with reference to the flat surface portion 1a located on the opposite side of the joining portion. After that, when the shaft member 2 is rotated at high speed in the direction of the arrow M while the end face of the shaft member 2 is pressed against the flat surface 1a of the annular member 1, the entire end surface of the shaft member 2 is rotated with respect to the flat part 1a. Are friction-welded in contact with each other, and the frictional heat energy generated in the contact portion raises the temperature of the joint portion to form a high temperature layer therebetween. Therefore, after the rotation of the shaft-shaped member 2 is suddenly stopped, the shaft-shaped member 2 is pressed with a high pressure (that is, upset pressure) in the direction indicated by the arrow P, and the two are joined. Thus, a product in which the annular member 1 and the shaft-shaped member 2 are integrally joined is obtained.

As described above, according to this embodiment, the pair of flat surface portions 1a, 1a with which the entire end surface of the shaft-shaped member 1 can contact the outer peripheral surface of the annular member 1 have a phase difference of 180 °. Since it is formed in advance over the entire length in the axial direction, a desired annular member shape can be obtained and a desired annular member shape can be obtained only by adopting a drawing method or a cold forging method when manufacturing the annular member 1. The adjustment of the wall pressure becomes easy, and extremely strong friction welding can be obtained without performing additional processing on the material as in the conventional example.

Further, since the pair of flat portions 1a, 1a are formed on the outer peripheral surface of the annular member 1 with a phase difference of 180 °, when fixing the annular member 1 during friction welding,
Positioning can be performed with reference to the flat surface portion 1a located on the opposite side of the joining portion, which facilitates process control when performing friction joining.

In the above embodiment, a pair of flat portions is formed on the outer periphery of the annular member, but it may be a flat portion having only one surface, or a plurality of flat portions (in other words, may be formed). The outer peripheral shape of the annular member may be polygonal).

[Brief description of drawings]

FIG. 1 is a side view showing a specific example of a method for joining an annular member and a shaft-shaped member according to the present invention.

FIG. 2 is a perspective view of the annular member and the shaft-shaped member in the method of joining the annular member and the shaft-shaped member according to the present invention.

FIG. 3 is a side view for explaining one example of a conventional method for joining an annular member and a shaft-shaped member.

FIG. 4 is a side view for explaining another example of the conventional method for joining the annular member and the shaft-shaped member.

FIG. 5 is a side view for explaining another example of the conventional method for joining the annular member and the shaft-shaped member.

[Explanation of symbols]

 Reference numeral 1 is an annular member, 1a is a flat surface portion, and 2 is an axial member.

Claims (1)

[Claims] 1. When joining an end surface of a shaft-shaped member to an outer peripheral surface of an annular member by a friction welding method, a flat surface portion on which the entire end surface of the shaft-shaped member can abut is provided on the outer peripheral surface of the annular member. A method for joining an annular member and a shaft-shaped member, characterized in that they are formed in advance over the entire length in the direction.