JP2020171933A - Method and structure for joining dissimilar metal member - Google Patents

Abstract

To provide a joining method and a joining structure of dissimilar metal members, that further simplify joining while maintaining a high degree of adhesion.SOLUTION: Provided is a joining method for joining a joining member 2 made of a desired metal material, and a member 3 to be joined made of a softer metal material than the joining member 2. In the joining method, the shaft-like joining member 2 is fitted to a cylindrical part 31 of the member 3 to be joined, and the circumference of this part is restrained in this state, and by compressing the member 3 to be joined in this state, both peripheral wall surfaces of these members are crimped and joined in a state that end faces of the cylindrical part 31 of the member 3 to be joined and the joining member 2 are aligned on the same plane. Accordingly, the joining member 2 and the member 3 to be joined can be easily joined with a high degree of adhesion. Further, by aligning the end faces of both members, external force hardly acts on the joining member 2, and the high degree of adhesion of both members can be maintained for a long period of time.SELECTED DRAWING: Figure 1

Description

The present invention relates to a joining method and joining structure of dissimilar metal members for joining metal members of different materials with a high degree of adhesion.

Conventionally, as a method of joining metal members of different materials and a joining structure thereof, for example, a joining method and a joining structure of metal members shown in Patent Document 1 are known. In this joining method and structure, the protrusion of the joining member is fitted with the hole of the member to be joined made of a softer material, and the protrusion of the joining member is undercut by compressing the member to be joined. It is deformed into a portion, and the surplus thickness of the member to be joined can wrap around the undercut portion well, the adhesion between the joint member and the member to be joined is improved, and the joint member can be firmly prevented from coming off. In addition, serrations, threads, etc. are provided at the protrusions of the joining member, and the surplus thickness of the joining member is tightly wrapped around the protrusions so that the joining member and the joining member can be prevented from rotating. There is.

JP-A-2018-1209

According to the above-mentioned conventional joining method and joining structure, it is possible to increase the degree of adhesion between the joining member and the member to be joined, and also to enhance the mutual pull-out prevention effect and rotation prevention effect, but the undercut portion and serrations There is a problem that the design work and process design related to plastic working, such as the compressive force of the member to be joined and the restraint structure for wrapping the surplus thickness around the screw thread, become precise. In general, there are joint parts that do not require strong retaining or rotation prevention using undercuts or serrations, so a simpler joining method and joining structure that maintains a high degree of adhesion between the joining member and the member to be joined. Needed to be developed.

The present invention has been created in view of the above problems, and an object of the present invention is to provide a joining method and joining structure of dissimilar metal members, which are easier to join while maintaining a high degree of adhesion. In order to achieve this object, the present invention is a joining method for joining a joining member made of a desired metal material and a joined member made of a metal material softer than the joining member, and the joined member is solid. A hollow cylindrical cylindrical portion is formed at the tip of the shaft portion, and the joining member is configured in a shaft shape having an outer diameter and a length substantially equal to the hollow hole of the cylindrical portion of the member to be joined. By restraining the outer periphery of the portion while being fitted to the cylindrical portion of the member to be joined and compressing the solid shaft portion in this state, the cylindrical portion of the member to be joined and the end face of the joint member are aligned on the same surface. It is characterized in that these peripheral wall surfaces are crimped to each other in a state of being joined.

Further, in order to achieve the above object, the present invention has a joining structure for joining a joining member made of a desired metal material and a joined member made of a metal material softer than the joining member, and the joined member. Is a structure in which a hollow cylindrical cylindrical portion is formed at the tip of a solid shaft portion, and the joining member is configured in a shaft shape having an outer diameter and a length substantially equal to the hollow hole of the cylindrical portion of the member to be joined. The joining member is fitted into a cylindrical portion of the member to be joined, and the peripheral wall surfaces of the joining member and the member to be joined are crimped to each other in a state of being aligned on the same surface. But also.

In the above-mentioned joining method or structure, it is desirable that an engaging portion is provided on the outer peripheral portion of the joining member. As a result, the engaging portion is filled with the surplus wall of the member to be joined, and the member to be joined and the member to be joined can be joined more firmly.

According to the present invention, in a state where the joint member is fitted to the cylindrical portion of the softer joint member, the outer circumference of the portion is restrained and the joint member is compressed, so that the end faces of the joint member and the joint member are formed. Since both are crimped and joined so that they are arranged on the same surface, there is an advantage that it is possible to easily perform joining with an extremely high degree of adhesion between the joining member and the member to be joined as in the conventional case. .. Further, since the end faces of the joining member and the member to be joined are arranged on the same surface, the meat of the member to be joined wraps around the chamfered portion on the periphery of the end face of the joining member at the time of joining, whereby the joining member can be prevented from coming off. Since it is difficult for an external force, particularly a moment, to act on the joint member, there is an advantage that the degree of adhesion between the joint member and the member to be joined can be maintained in a high state. Further, by providing a recess on the outer periphery of the joining member, there is an advantage that the meat of the material to be joined can wrap around the recess and both members can be more firmly prevented from coming off.

(A) is a cross-sectional view of a main part of a dissimilar metal member bonded product according to the present invention, (b) is an enlarged view of a part A thereof, and (c) is a perspective view thereof. It is a perspective view which shows the material of the joint member and the joint member of the dissimilar metal joint part which concerns on this invention. It is explanatory drawing which shows the joining method of the dissimilar metal member which concerns on this invention, (a) is the sectional view which shows the state which disassembled the joining member and the member to be joined, (b) is the sectional view which shows the state which combined both members. It is a figure. It is explanatory drawing which shows the joining method of the dissimilar metal member which concerns on this invention, (a) is the sectional view which shows the state which the material of the joining member and the member to be joined is arranged in the receiving die, (b) is the receiving die It is sectional drawing which shows the state which compressed and joined in the inside.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1A to 1C, reference numeral 1 denotes a joining member 2 made of steel such as carbon steel and a member to be joined made of an aluminum alloy which is an example of a metal material softer than the joining member 2. It is a dissimilar metal member bonded product (hereinafter, referred to as a dissimilar material bonded product 1) formed by integrally joining 3 and.

As shown in FIGS. 1A and 2, the joining member 2 has a solid shaft shape, and is engaged with the outer periphery of one end portion on the inner side of the member to be joined 3 over the entire circumference. An annular groove-like recess 21 which is an example of the portion is formed. Further, as shown in FIG. 1B, a chamfered portion 22 is formed on the other end surface of the joining member 2 located on the same surface as the end surface of the member 3 to be joined. The chamfered portion 22 is formed by cutting or forging the peripheral edge portion of the other end surface of the joining member 2.

As shown in FIG. 1A, the member 3 to be joined has a hollow cylindrical cylindrical portion 31 into which the joining member 2 is inserted, and one end of the cylindrical portion 31 is formed in FIG. 1A and As shown in FIG. 3C, it is formed into a flange portion 32 that extends circularly in the outer peripheral direction. One end of the joining member 2 is located inside the flange portion 32, and the recess 21 there is densely filled with the meat of the joining member 3. Further, the other end of the member 3 to be joined, that is, the open end of the cylindrical portion 31, is located on the same surface as the other end of the joint member 2 as shown in FIG. 1 (b), and the end of the cylindrical portion 31. The surplus thickness of the portion is configured to cover the chamfered portion 22 of the joining member 2.

Next, a joining method for joining the joining member 2 and the member to be joined 3 to obtain a dissimilar material bonded product 1 will be described with reference to FIGS. 2 to 4. As shown in FIGS. 2 and 3, the member 3 to be joined before joining has a solid shaft portion 33 that becomes the flange portion 32 after molding, and the cylindrical portion 31 is attached to the solid shaft portion 33. The structure is integrally connected (see FIG. 3A). Further, the joining member 2 is configured to have an outer diameter and a length substantially equal to the inner diameter and the length of the hollow hole 31a of the cylindrical portion 31 of the cylindrical portion 31 of the member to be joined 3 in this blank state.

At the time of joining, as shown in FIG. 3B, the joining member 2 is inserted into the cylindrical portion 31 of the member to be joined 3, and the fitting portion is fitted into the molding hole 41 of the mold 4. At this time, a knockout pin Np having the same diameter as the molding hole 41 and slidable along the molding hole 41 is arranged at a predetermined position in the back of the molding hole 41, and the cylindrical portion is formed by the molding hole 41 and the knockout pin Np. The entire outer circumference including the end face of the fitting portion between the 31 and the joining member 2 is restrained, and the solid shaft portion 33 connected to the cylindrical portion 31 is not restrained (see FIG. 4A). The molding hole 41 of the receiving mold 4 is configured to have the same diameter as the outer diameter of the cylindrical portion 31, so that the cylindrical portion 31 fits into the molding hole 41 with a fit of about a clearance fit.

Subsequently, when the solid shaft portion 33 is pressed by the punch P and compressed, the solid shaft portion 33 is plastically deformed into a circular collar shape and formed into the collar portion 32, and the flow of the material generated thereby causes the recess 21 to be formed. Is densely filled with the surplus thickness of the member to be joined 3 (see FIG. 4B). At this time, since the cylindrical portion 31 side is constrained by the receiving mold 4 and the knockout pin Np, the open end surface of the cylindrical portion 31 and the other end surface of the joining member 2 are accurately aligned on the same surface and are slightly aligned. The surplus thickness of the member to be joined 3 flows into the gap between the chamfered portion 22 and the cylindrical portion 31, which is a gap, and is densely filled. At the other parts of the cylindrical portion 31 and the joining member 2, the peripheral wall surface of the hollow hole 31a of the cylindrical portion 31 is pressed against the outer peripheral wall surface of the joining member 2 and crimped. As a result, the joining member 2 can be prevented from coming off in the cylindrical portion 31, and the joining member 2 and the member to be joined 3 can be joined with an extremely high degree of adhesion.

In the dissimilar material bonded product 1 joined as described above, since the end face of the cylindrical portion 31 of the member 3 to be joined and the end face of the joining member 2 are aligned on the same surface, an external force is applied to the joining member 2 in particular. The moment is hard to act on, and the degree of adhesion between the joining member 2 and the member to be joined 3 can be maintained for a long period of time in a high state. Moreover, since the interface between the cylindrical portion 31 and the joining member 2 is tightly crimped and joined, the contact resistance between them is high, and the structure in which the above-mentioned moment does not easily act is combined with this alone, so that the joining member 2 and the joint member 2 are covered. It is possible to obtain a constant retaining effect and a rotation preventing effect between the joining members 3.

In the present embodiment, the concave portion 21 is provided in the joining member 2, but it is obtained from the surplus thickness that wraps around the chamfered portion 22 and the degree of adhesion of the interface between the cylindrical portion 31 and the joining member 2 even if the concave portion 21 is not provided. Depending on the contact resistance, a certain anti-removal effect and anti-rotation effect can be obtained. Therefore, when a strong retaining effect or rotation preventing effect is not required, the shape of the joining member 2 can be made even simpler without providing the recess 21. As a result, the joining member 2 and the member to be joined 3 can be joined more easily. Further, the joining member 2 is made of steel and the joining member 3 is made of an aluminum alloy, but the material is not limited to these, and the material forming the joining member 3 is more than the material forming the joining member 2. If it is softer, it is possible to select any of the metallic materials in which the material can flow due to plastic deformation. Further, as the engaging portion, a shape other than the recess 21 can be adopted as long as the shape is such that the surplus thickness of the member to be joined 3 is rotated to cause catching.

1 Dissimilar metal member joined product 2 Joined member 21 Recessed part 22 Chamfered part 3 Jointed member 31 Cylindrical part 31a Hollow hole 32 Collar part 33 Solid shaft part 4 Receiving type 41 Molding hole Np knockout pin P punch

Claims (4)

A joining method for joining a joining member made of a desired metal material and a member to be joined made of a metal material softer than this joining member.
The member to be joined has a structure in which a hollow cylindrical cylindrical portion is formed at the tip of the solid shaft portion, and the joint member is configured to have a shaft shape having an outer diameter and a length substantially equal to the hollow hole of the cylindrical portion of the member to be joined. By restraining the outer periphery of the portion in a state where the joint member is fitted to the cylindrical portion of the member to be joined and compressing the solid shaft portion in this state, the cylindrical portion of the member to be joined and the end face of the joint member are used. A method for joining dissimilar metal members, which comprises crimping and joining these peripheral wall surfaces in a state where they are aligned on the same surface. The method for joining dissimilar metal members according to claim 1, wherein an engaging portion is provided on the outer peripheral portion of the joining member. A joining method for joining a joining member made of a desired metal material and a member to be joined made of a metal material softer than this joining member.
The member to be joined has a structure in which a hollow cylindrical cylindrical portion is formed at the tip of the solid shaft portion, and the joint member is configured to have a shaft shape having an outer diameter and a length substantially equal to the hollow hole of the cylindrical portion of the member to be joined. And
A different type of joint member, wherein the joint member is fitted into a cylindrical portion of the member to be joined, and the peripheral wall surfaces of the joint member and the member to be joined are crimped to each other in a state of being aligned on the same surface. Joint structure of metal members. The joining structure for dissimilar metal members according to claim 3, wherein an engaging portion is provided on the outer peripheral portion of the joining member.

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