JPS6142475A - Method of joining metallic members - Google Patents

Abstract

PURPOSE:To improve strength of joining by plastically fluid-joing the titled metallic members by using a joining member whase outer surface is covered with brazing filler metal and then heating the metallic members and brazing them. CONSTITUTION:An annular joining member 6 is put in an annular recess 5 formed by pressing-in of a transmission gear 2 and a clutch cone 3. The member 6 is covered with brazing filler metal such as Cu-Sn alloy, etc. which melts at the carburizing temperature. A punch is applied to the joining member 6 from above, and the joining member 6 is made to plastically flow into grooves 9, 10 of metallic members 2, 3 and the two members 2, 3 are joined. Then, gears of joined metallic members 2, 3 are carburized and hardened. The brazing filler metal on the surface of the member 6 is melted at the carburizing temperature and brazing is performed. As joining of metallic members 2, 3 is made by plastic flow, and at the same time, brazing of the brazing filler metal is made, its joining strength is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for plastic flow bonding of two metal members via a coupling member.

(Prior Art) Conventionally, as a method of joining two metal members, there is a four-way method in which a metal with a lower melting point (so-called brazing material) is melted and added to the joining surfaces of the metal members to be joined. Although pecking methods are known, high bonding strength could not be expected.

However, in recent years, as a bonding method that can obtain high bonding strength,
A method of plastic flow bonding of two metal members via a coupling member (for example, see Tokkosho, No. 56-41♂g 5)
is proposed.

(Objective of the Invention) An object of the present invention is to improve the conventional plastic flow bonding method and provide a method for bonding metal members that can obtain even higher bonding strength.

(Structure of the Invention) In the method described above, the present invention coats the outer surface of the joining member with a metal brazing material, and after plastic flow joining is performed using this, the joined parts are heated to the brazing temperature. This method is characterized by brazing by heating and holding, and combines the advantages of the plastic flow bonding method and the brazing method.

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

The split mission gear 1 shown in FIG. 1 is formed by plastic flow coupling of two metal members, a mission gear 2 and a clutch cone 3, via a coupling portion 4 and brazing. Note that a recess 4a is formed in the upper surface of the joint portion 4 by press-fitting a punch 12, which will be described later.

Next, a method for manufacturing the split mission gear 1 will be described.

Process/ First, as shown in FIG. 2, the clutch cone 3 is press-fitted into the mission gear 2, and the mission gear 2 and the clutch cone 6 are inserted into the annular recess 5 formed between the two and 3 by the press-fitting. An annular coupling member 6 having a hardness smaller than that of the recess 5 and having a slightly smaller height than the depth of the recess 5 is inserted.

Opposing surfaces 7 and 8 forming the recess 5 of the mission gear 2 and the clutch cone 3 are provided with an annular groove 9 having a v-shaped cross section;
10 is recessed.

On the other hand, the coupling member 6 is made of a steel material such as 510c having a relatively low carbon content and low plastic deformation resistance, and its outer surface is entirely coated with a metal brazing material 11 such as a Cu-Sn alloy that melts at carburizing temperature. covered or partially covered.

Step 2 As shown in Figure 2, a punch 12 is applied to the coupling member B from above, and the coupling member 6 is plastically flowed into the grooves 9 and 10 of the transmission gear 2 and the clutch cone 3 with a low pressure. Then connect both 2゜3. In this case, since a low pressurizing force is sufficient, there is little influence on the mission gear 2 and the clutch gear 6, and almost no deformation occurs.

Carburizing and quenching as a treatment. In this case, since the carburizing and quenching temperature is comparable to the brazing temperature, brazing is performed by raising the temperature to the carburizing and quenching temperature.

At this time, the metal brazing material 11 melts and flows into the portions into which the joining member 6 is difficult to flow, such as the tip portions of the grooves 9 and 10, so that the joining strength is improved. In addition, due to the sealing effect caused by the inflow of the metal brazing filler metal 11, which looks like a double series, the pressure force that causes the joining member 6 to plastically flow can be made smaller than in the conventional plastic flow joining method. Deformation of the tooth portion can be reduced and accuracy can be improved.

In addition, no special heat treatment is required for brazing, so
This method is extremely efficient and requires less metal brazing material than the method of placing metal brazing material on the joint.

Note that since the metal brazing material 11 is coated on the joining member B and is already located within the joint, the surface diffusion range is narrow, and even if it diffuses, it will take time to diffuse, so the heat treatment is performed using #1. It has no effect.

Next, a case A in which the split mission gears 1 as described above are multi-connected by the method of the present invention, a case B in which the brazing process is omitted by the method of the present invention, and a case B in which the split mission gears 1 as described above are multi-connected by the conventional plastic flow bonding method. The test results comparing gear accuracy and connection strength with respect to C will be explained.

The dimensions of the mission gear 2 and clutch cone 3 constituting the sample dividing mission gear 1 are as shown in FIGS. 2 and 5. L1=jtIal, L2=611II.

L3=Q6wx, θ=2o0. The material for both 2°3 is chrome steel (SCR420H).

On the other hand, the base material of the bonding member 6 is 515c, and the outer surface is made of Cu! ? A metal brazing material 11 (approximately 7?) made of an alloy of 0Wt, Sn, and 2θwt is uniformly coated.

Carburizing and quenching treatment conditions 23θ℃XJ, 26hr carburizing treatment, ♂, 50℃→oil cooling quenching treatment. Note that the metal brazing material 11 melts at 250°C.

Test method By fixing one of the mission gear 2 and clutch cone 6 after they are combined and applying a rotational force to the other, the rotational force when both 2 and 3 are separated is determined as the binding force (torsional binding force). did.

The gear accuracy after coupling was in accordance with JISB770.2.

Test results The test results are shown in the table below.

Therefore, it can be seen that in case A of multiple coupling according to the method of the present invention, a large coupling force and high gear accuracy can be obtained.

(Effects of the Invention) Since the present invention is configured as described above, the bonding strength of the two metal members is significantly improved due to the synergistic effect of the bonding by plastic flow and the bonding by brazing.

Therefore, if a large bonding strength is not required, the pressure applied during plastic flow bonding can be reduced, and therefore accuracy can be improved.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a cross-sectional view of a split mission gear multiple-joined by the method of the present invention, FIG. 2 is an explanatory diagram of the process, and FIG. 3 is a longitudinal cross-sectional view of a joining member. , FIG. 7 is an explanatory diagram of step 2, and FIG. 5 is an explanatory diagram showing the shape of the groove. '1. L...Split mission gear, 2...
・Mission gear, 3...Clutch cone, 6
......Connecting member, 11...Metal brazing material

Claims (1)

[Claims] (1) In a method of plastic flow bonding of two metal members via a joining member, the outer surface of the joining member is coated with a metal brazing material, and after plastic flow joining is performed using this, the joining is performed. A method for joining metal members, characterized by brazing the parts by heating and holding them at a brazing temperature.