JPS61245934A - Joining method for metal member - Google Patents

Abstract

PURPOSE:To increase a joining strength in plastic flow parts by forming joining groove parts positioned at the end of the impressing direction of a pushing force to have inclined planes approaching the extension line of the impressing direction of the pushing force as the groove parts are nearer to the end. CONSTITUTION:Both joining faces A and B are opposite to each other and a joining space C is formed between a change gear 1 and a clutch cone 2 when the gear 1 and cone 2 are joined in a specified joining relation. The joining space C consists of inclined planes having a gradually larger width toward an aperture C1, in other words, both the joining faces A and B are inclined planes which gradually approach the extension line of the applying direction of the pushing force F causing plastic flow as the faces A and B are nearer to the end of the applying direction. A joining material 3 is pushed into the joining space C from the aperture C1 side by the specified pushing force F by a punch to be flowed plastically, to be expanded in the crossing direction to the pushing direction, that is, the lateral direction, and to be flowed and to be filled in the joining grooves 4a, 4b, 5a, and 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of joining metal members using plastic flow.

(Prior art) As a method of joining two metal members together,
- As shown in Japanese Patent No. 8895, there is a device that utilizes plastic flow deformation of a connecting member.

That is, in the one described in the above publication, one metal member and the other metal member each having a coupling groove are combined so that the coupling surfaces having the coupling grooves face each other,
A joint space with one end open and the other end closed is formed between the two metal members, and the joint member is pushed into the joint space from the one end open side to cause plastic flow deformation. The two metal members are coupled to each other via a coupling member that is filled in the coupling space with the portion flowing into the coupling groove.

In this way, the plastically flowed metal member and the metal member that receives the plastically flowed portion are joined together, and as this plastically flowed metal member, it is possible to connect them separately as described above. When using members (metallic members for joining),
Two other metal members required to be joined are joined via this joining member. Furthermore, if one of the two metal members required to be joined is used as the metal member subjected to plastic flow, the two metal members can be joined together without using a separate metal member for joining. That will happen.

(Problem to be Solved by the Invention) Recently, in order to further improve the bonding strength in the plastic flow portion, it has been considered to form the bonding groove in multiple stages in the direction of applying the pushing force for plastic flow. It is being However, when this coupling groove is formed in multiple stages, the metal member that is subjected to plastic flow due to the stress caused by the pushing force becomes smaller as it approaches the end in the pushing force application direction. Sufficient plastic flow did not take place within the joint groove located at the joint, and as a result, it was not always possible to obtain a satisfactory joint strength improvement. That is, the inflow action of the metal member receiving the pushing force into the coupling groove becomes weaker toward the end in the application direction, resulting in the above-mentioned problem.

Therefore, an object of the present invention is to apply a pushing force that is less likely to cause plastic flow in the connection between a first metal member having a plurality of coupling grooves and a second metal member that undergoes plastic flow in response to a push force. It is an object of the present invention to provide a method for joining metal members, which allows sufficient plastic flow to occur even in the joint grooves located at the ends in the direction, thereby further improving the joint strength at the plastic flow portions.

(Means and operations for solving the problem) In order to achieve the above-mentioned object, in the present invention, the coupling surface of the first metal member having a plurality of coupling grooves in the pushing force application direction is The coupling groove portion located at the end in the force application direction is an inclined surface that approaches the extension line in the application direction as it goes toward the end in the pushing force application direction.

With this configuration, the metal member that receives the pushing force becomes smaller as it goes toward the end in the direction of application of the pushing force, so that the lateral spacing (cross-sectional area perpendicular to the direction of application) becomes smaller. As a result, a larger stress is applied, and sufficient plastic flow occurs even in the coupling groove located at the end.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

In this specification, a metal member having a coupling groove will be described as a first metal member, and a metal member that undergoes plastic flow under a pushing force will be described as a second metal member.

Figures 1 and 2 show a first embodiment of the present invention, in which a second metal member that undergoes plastic flow is used separately for two tJS1 metal members that are required to be connected to each other. ing. Reference numeral 1 designates an annular transmission gear as a first metal member, and 2 also represents an annular clutch cone as a first metal member. The method of the present invention for obtaining such a conjugate is shown in FIGS. 2 and 3.
This will be explained with reference to the figures.

The transmission gear 1 has a coupling surface A formed on the outer circumferential surface of the boss portion 1a, and a coupling surface B formed on the inner circumferential surface of the clutch claw 72 that is fitted onto the outer circumference of the boss portion 1a.

When the transmission gear l and the clutch cone 2, each of which is a first metal member, are fitted in a predetermined coupling relationship, the refitting surfaces A and B are opposed to each other, and the two 2 (
A coupling space C is formed between A and B). One end of the coupling space C is opened as an opening C1 toward one side plate surface of the transmission gear 1 serving as the first metal member, while the other end is closed. The coupling space C has an inclined surface whose width gradually increases toward the opening C1. That is, as the recombination surfaces A and B move toward the end in the direction of application of the pushing force F for plastic flow (second
The tapered surface gradually approaches the extension line of the above-mentioned application direction (as it goes downward in the figure).

The coupling surface A of the transmission gear 1 has two coupling grooves 4a and 4b formed in its axial direction, and similarly the coupling surface B of the clutch cone 2 has two coupling grooves 5a and 5b formed therein. ing. These coupling grooves 4a, 4b, 5a, and 5b are respectively formed in an annular shape centered on the axis of the transmission gear 1 (7), and the coupling grooves 4a and 5a near the opening CI face each other. , the coupling groove 4 further away from this opening Ct.
b and 5b are facing each other.

The coupling member 3 has an annular shape centered on the axis of the transmission gear I, and is pushed into the coupling space C from the opening C1 side by a predetermined pushing force F using a punch (not shown). Since the coupling member 3 to be pushed in has a volume almost equal to the volume of the coupling space C, the coupling member 3 that is pushed in has a volume that is approximately equal to the volume of the coupling space C. The coupling member 3 pushed in by the pushing force F (see Fig. 3) expands in the direction intersecting the pushing direction, that is, in the lateral direction, while plastically flowing, and forms the coupling grooves 4a, 4b, 5a, 5.
It will flow and be filled in b. During this plastic flow, the coupling grooves 4a and 5a on the side closer to the opening C1, which is the pushing side,
In this case, since this pushing force is sufficiently transmitted, that is, the stress applied to the coupling member 3 at this portion is sufficiently ensured, the coupling member 3 is sufficiently inflowed and filled.

On the other hand, the coupling grooves 4b and 5b on the side remote from the opening C1
Also, due to the slope mentioned above,
After all, it is possible to generate sufficient stress in the joining member 3, so that the joining member 3 is sufficiently flowed and filled.

Here, in order to investigate the bond strength by the method of the present invention, the following test was conducted. The test conditions are as follows.

Transmission gear 1: 5CR420H is carburized and quenched, and the outer diameter φ1 of the connecting surface A is 50 mm.

Clutch cone 2: Carburized and quenched 5CR420H, and the inner diameter φ2 of the coupling surface B is 56 mm.

Coupling member 3: 525G Coupling grooves 4a, 4b, 5a, 5b: As shown in FIG. 2, the shape is triangular in cross section, the opening angle θ is 90'', and the depth t is 0.75.
mm, and the length shown in Figure 2 is 3 mm.

Pushing force F of connecting member 3: 60 tons Inclination angle of bonding surfaces A and B: They are shown as α in FIG. 2, and each angle is 30°.

The strength of the connection between the transmission gear l and the clutch cone 2 when they are connected under the above conditions, that is, the torque when they are rotated in the opposite direction and the connection is released is 504 kg.
It was m. For comparison, a test was conducted under the same conditions as above except that bonding surfaces A and B were made parallel, and the bonding strength was 360 kgm.

FIGS. 3 and 4 show other embodiments of the present invention, and the same components as in the previous embodiments are given the same reference numerals and their explanations will be omitted.

In this embodiment, one of the two metal members required to be connected to each other is used as a metal member (second metal member) that is plastically flowed by receiving a pushing force.

In FIG. 3, 11 is a transmission gear as a second metal member, 12 is a transmission gear as a first metal member, and both transmission gears 11 and 12 are directly coupled using plastic flow. . That is, in a state in which the annular transmission gear 12 having the gear portion 12a is fitted to the outer periphery of the cylindrical transmission gear 11 having the gear portion 11a, both gears are connected by using plastic flow described later in this fitted portion. 11 and 12 are combined.

To explain the method of the present invention for coupling both the gears 11 and 12, a tapered inclined surface 11b is formed on the outer peripheral surface of the transmission gear 11, while a tapered coupling is formed on the inner peripheral surface of the transmission gear 12. A surface 12b is formed so that both gears 11 and 1
2 are fitted and assembled, the inclined surface flb and the coupling surface 12b are in contact with each other. That is, both surfaces 11b and 12b are tapered surfaces whose diameter gradually increases from the bottom to the top in FIG. 1, and the transmission gear 12 is fitted into the transmission gear 11 from the bottom in FIG. When the two surfaces 11b and 12b are in contact with each other, the normal assembly position is determined.

Two coupling grooves 13 and 14 are formed in the coupling portion 12b. Of these two coupling grooves, the coupling groove 13 corresponds to the coupling groove 5a in the above embodiment, and the coupling groove 14 corresponds to the coupling groove 5a in the above embodiment.
corresponds to the coupling groove 5b in the embodiment described above, and has an annular shape centered on the axis of the transmission gear 11 (transmission gear 12).

As described above, when the pushing force F is applied to the upper end of the transmission gear 11 in the vicinity of the inclined surface 11b, as shown in FIG. This neighboring portion undergoes plastic flow and flows into the reconnection groove 13.14, thereby directly connecting both transmission gears 11 and 12. In addition, in the wooden embodiment as well, due to the inclination of the bonding surface 12b, sufficient plastic flow is caused also to the bond #114 located on the end side in the direction of application of the pushing force F, as in the previous embodiment. .

In the above embodiments, the joint surface having multiple stages of joint grooves is inclined as a whole, but the slope in order to increase the stress for plastic flow is in the joint groove located at the end in the direction of application of pushing force. It is good to have only a portion. In addition, the above-mentioned inclination angle α is preferably large in terms of stress generation for plastic flow, and small in order to perform smooth pushing.
It is preferable to set it in the range of 0'' to 45 degrees.

(Effects of the Invention) As is clear from the above description, the present invention can further strengthen the connection of plastic flow parts. As a result, the range of applications for products that require high bonding strength is expanded, while for products that require the same bonding strength, the bonding load, that is, the pushing force for plastic flow, can be made smaller. Therefore, it is possible to improve the precision of the metal members after joining.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a bonded product obtained by the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1, showing a joint portion due to plastic flow. FIG. 3 shows another embodiment of the present invention and is a sectional view corresponding to FIG. 1. FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 3, showing a joint portion due to plastic flow. l: Transmission gear (first metal member) 2: Craft cone (first metal member) 3: Coupling member (second metal member) 4a, 4b, 5a, 5b: Coupling groove A, B: Coupling surface ゛C: Coupling space C1: Opening F: Pushing force ll: Speed change gear (second metal member) 12: Speed change gear (first metal member) 12b: Coupling surface 13: Coupling groove 14: Coupling groove

Claims (1)

[Claims] (1) Bonding of metal members in which both metal members are bonded by plastically flowing the second metal member into a bonding groove formed in the first metal member using a pushing force from one predetermined direction. In the method, a plurality of coupling grooves are formed in the coupling surface of the first metal member in the direction in which the pushing force is applied, and a coupling groove portion of the plurality of coupling grooves is located at an end in the direction in which the pushing force is applied. By making the bonding surface an inclined surface that approaches the extension line in the application direction as it goes toward the end in the pushing force application direction, when the second metal member is made to plastically flow, in the vicinity of the inclined surface. A method for joining metal members, characterized in that a large stress is applied to the second metal member.