JP2002001461A - Manufacturing method for metal jointing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a metal jointing body having high jointing strength by a simple solid phase method. SOLUTION: The manufacturing method of a metal jointing body is a method for performing pressed jointing and purification at the same time and at a simple manner. In the case of obtaining a circular metal jointing body, the manufacturing method comprises a process for obtaining a multi-layered circular body 10A in which a plurality of circular metallic members 11 and 12 having a different diameter are fitted in each other, a process for bringing an adjacent inner and outer periphery surfaces of each circular metallic member forming the multi-layered circular body into close contact with each other while enlarging the outer diameter of the entire multi-layered circular body, and a process for the inner and outer periphery surfaces in close contact in a solid phase state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for joining metal-based materials, and more particularly, to a technique for manufacturing a metal joined body based on solid-state joining.

[0002]

2. Description of the Related Art There is a solid-state joining method as one means for joining surfaces of various metallic materials and metalized surfaces of ceramic materials to each other. In this joining method, the joining surfaces of the two materials are appropriately pressed while being in close contact with each other, so that the joining surfaces are joined in a solid state without melting. Therefore, in such a solid-phase joining method, a fusion-solidified portion does not occur in the joined portion, and precise joining with a small amount of deformation can be performed. For this reason, when manufacturing a relatively small and precise metal bonded body (all materials having a metal-to-metal bonded portion; the same applies hereinafter) for various industrial applications, a bonding means between the constituent members (members to be bonded). The solid-phase bonding method described above is often used.

[0003] The success or failure of such solid-phase bonding (diffusion bonding, pressure welding, etc.) largely depends on the degree of the diffusion of atoms and the effect of attractive forces between atoms generated at the joint between the two members to be joined. That is, in order to obtain good joining strength by solid phase joining, it is necessary to keep the adhesion between joining surfaces as high as possible. If the adhesion is low, diffusion of atoms and attractive action between atoms become insufficient, and as a result, high-strength solid-state bonding cannot be realized. In order to improve the adhesion between the joining surfaces, the joining surface is cleaned (that is, the surface where the original metal substrate is exposed by destroying / removing an oxide film or the like formed on the metal surface (hereinafter, referred to as a surface). "New surface") is important. Conventionally, in order to obtain a relatively small and precise metal bonded body, in order to clean such a bonded surface, a mechanical polishing process (such as wire brushing) or an electrical A chemical polishing process (such as electrolytic polishing) has been performed.

[0004]

According to various polishing processes before the above-mentioned bonding process, a new surface can be formed by temporarily removing an oxide film or the like on the bonding surface. The oxidizing gas in the atmosphere (typically atmospheric oxygen) immediately initiates the formation of a new oxide layer on the new surface. For this reason, in order to prevent the formation of such a new oxide film, it was necessary to carry out a solid-phase bonding treatment in a reducing or inert gas atmosphere or in a vacuum (for example, see Japanese Patent Application Laid-Open No. Hei 4-284984). However, performing solid phase bonding while setting and maintaining such environmental conditions requires expensive special equipment, complicates the bonding process itself, and further increases the cost associated with solid phase bonding. Is not preferred.

Accordingly, the present invention has been made to solve the above-mentioned problems relating to solid-state joining, and an object of the present invention is to provide a simple solid-state joining method for a metal joined body having high joining strength. Is to provide a method of manufacturing. Another aspect related to the object of the present invention is to provide a metal joined body manufactured by the manufacturing method, and to provide a solid-state bonding method performed in the manufacturing method.

[0006]

MEANS TO SOLVE THE PROBLEM, EFFECTS AND EFFECTS According to one aspect of the present invention, there is provided a method for manufacturing a metal joined body, in which a plurality of annular metal members having different diameters are fitted to each other. A step of obtaining a multilayer annular body constituted by the above, while increasing the outer diameter of the entire multilayer annular body, the adjacent inner peripheral surface and outer peripheral surface of each annular metal member constituting the multilayer annular body are mutually The method includes a step of bringing the inner peripheral surface into close contact and a step of solid-phase joining the inner peripheral surface and the outer peripheral surface of the closely adhered.

In the manufacturing method having this configuration (hereinafter referred to as "first manufacturing method of the present invention"), a multilayer annular body (ring material) manufactured by fitting a plurality of annular metal members (ring materials) having different diameters from each other. By increasing the diameter of the multiple ring member), the adjacent outer peripheral surface and inner peripheral surface of each of the annular metal members constituting the multiple ring members can be strongly adhered to each other. At the same time, as the surface area of the outer peripheral surface and the inner peripheral surface of each annular metal member increases due to the increase in diameter, the oxide film and other dirt adhered to the outer peripheral surface and the inner peripheral surface are destroyed / separated or Can be peeled. This is because the oxide film and other stains do not increase in accordance with the increase in the surface area. For this reason, in the first manufacturing method of the present invention, advanced cleaning of each joint surface (that is, generation of a new metal surface without an oxide film or the like) and mutual contact between the joint surfaces can be performed without complicated work or special equipment. Strong adhesion can be realized at the same time. That is, a suitable solid-phase joining can be generated between the joined surfaces that have been cleaned. Therefore, according to the first manufacturing method of the present invention, a ring-shaped metal joined body in which the above-described ring-shaped metal members are mutually solid-phase bonded to each other with high strength (that is, a metallic bond such as an interatomic bond) is easily manufactured. be able to.

[0008] In one of the preferable methods as the first production method of the present invention, the above-mentioned close contacting step and the joining step are performed in such a manner that a non-oxidizing gas (inert gas or reducing gas) is applied to the contact portion between the inner peripheral surface and the outer peripheral surface. ). According to the manufacturing method of this aspect, it is possible to prevent the oxide film from being newly formed on the newly formed surfaces formed on the inner peripheral surface and the outer peripheral surface. Therefore, according to the present manufacturing method,
An annular metal joined body in which the annular metallic members are solid-phase joined to each other with high strength can be manufactured more efficiently.

Another object of the present invention, which is provided to achieve the above object, is to provide a method for manufacturing a metal joined body in which an insertion hole formed in a member to be inserted has a cross-sectional shape (with respect to the insertion direction). A step of press-fitting at least a part of an insertion member having a substantially circular cross-section in a direction perpendicular to the rotation direction in a rotational state relative to the inserted member; This is a method including a step of solid-phase joining the press-fitted outer wall surface of the insertion member and the inner wall surface of the insertion port of the inserted member.

According to the manufacturing method having this configuration (hereinafter referred to as "the second manufacturing method of the present invention"), suitable solid-phase joining between the inserted member and the inserted member can be easily realized. That is, in the second manufacturing method of the present invention, the insertion member having a substantially circular cross section (including a member having a distortion that does not hinder rotation in the insertion slot) is relatively rotated, that is, With the insertion member and / or the member to be inserted being rotated about the insertion direction as a rotation axis, at least a part of the insertion member is pressed into the insertion port. Thereby, it is possible to plastically deform the outer wall surface of the insertion member and the inner wall surface of the inserted member while causing friction. As a result, the oxide film and other dirt adhering to both joint surfaces (ie, the outer wall surface and the inner wall surface) can be destroyed and removed by the physical action and the thermal action based on the friction. At the same time, the two joining surfaces can be strongly adhered to each other by plastic deformation of the two members accompanying the press-fitting. That is, in the second manufacturing method of the present invention, both of the joint surfaces are highly purified (that is, a new metal surface without an oxide film or the like) and the joint surfaces are strong without any complicated work or special equipment. Adhesion can be achieved at the same time. Thereby, a suitable solid-phase bonding can be generated between the cleaned bonding surfaces. Therefore, according to the second manufacturing method of the present invention, a metal joined body in which the inserting member and the inserted member are mutually solid-phase bonded to each other with high strength (that is, metallic bonding such as interatomic bonding) can be easily manufactured. can do.

One of the preferable methods as the second manufacturing method of the present invention further comprises a step of supplying a powdery abrasive to the outer wall surface of the insertion member and / or the inside of the insertion port at the time of the press-fitting. Include. According to the manufacturing method of this aspect, removal and peeling of the oxide film or the like at the time of press-fitting can be performed more efficiently. For this reason, according to this manufacturing method, it is possible to more reliably and easily manufacture a metal joined body in which the insertion member and the inserted member are solid-phase joined to each other with high strength.

Another object of the present invention is to provide a method for manufacturing a metal joined body according to the present invention, which comprises inserting an insertion hole formed in a member to be inserted with a higher hardness than the member to be inserted. A step of press-fitting the insertion member, and a step of solid-phase bonding at least a part of the outer wall surface of the pressed-in insertion member and the inner wall surface of the insertion opening of the inserted member, wherein the press-fitting step includes the step of inserting In the process of press-fitting the member, at least a part of the inner wall surface of the insertion port has acquired a higher hardness than the hardness of the outer wall surface of the insertion member due to local plastic deformation based on the press-fit, and has obtained the high hardness. The method is characterized in that at least a part of the outer wall surface of the insertion member, which is subsequently press-fitted by the portion, is cleaned.

According to the manufacturing method having this configuration (hereinafter, referred to as "third manufacturing method of the present invention"), suitable solid-state joining between the inserted member and the inserted member can be easily realized. That is, in the third manufacturing method of the present invention, by performing the press-fitting step of the above aspect, a part of the outer wall surface of the insertion member and the inner wall surface of the insertion port of the inserted member (typically, Part including the part adjacent to)
The level of hardness is reversed between and. This hardness reversal is caused by the fact that the hardness of the part of the inner wall surface of the insertion opening of the inserted member becomes higher than the hardness of the outer wall surface of the insertion member (work hardening) due to local and continuous plastic deformation due to press-fitting of the insertion member. It is. Therefore, according to the third manufacturing method of the present invention, first, the inner wall surface of the insertion opening of the inserted member is plastically deformed by press-fitting the insertion member, and an oxide film and other dirt attached to the surface are destroyed / removed and a new surface is generated. Can be done. Furthermore, after the hardness of a part of the inner wall surface of the insertion opening of the inserted member becomes higher than the hardness of the outer wall surface of the insertion member due to the plastic deformation based on the press-fitting, the outer wall surface of the insertion member which is subsequently pressed-in is changed to the high hardness. The plasticized portion is plastically deformed by the oxidized portion, and an oxide film and other dirt attached to the surface can be destroyed and removed to form a new surface.
That is, a new surface from which the oxide film has been removed can be generated on the wall surfaces of both members. Thus, by continuing the press-fitting, the two new surfaces can be strongly adhered to each other. For this reason, in the third manufacturing method of the present invention, high-level cleaning of both joint surfaces (that is, generation of a new metal surface without an oxide film or the like) and mutual contact between the joint surfaces can be performed without complicated work or special equipment. Strong adhesion can be realized at the same time. This allows
Suitable solid-state bonding can be generated between the cleaned bonding surfaces. Therefore, according to the third manufacturing method of the present invention, a metal joined body in which the insertion member and the inserted member are mutually solid-phase bonded with high strength (that is, a metallic bond such as an interatomic bond) can be easily manufactured. can do.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can be typically implemented as follows. In practicing the present invention, setting of conditions and selection of materials (members to be joined) other than the specific contents described in detail below are generally adopted in the plastic working technology field and / or the welding / joining technology field. What is performed is not particularly limited.

First, a preferred embodiment of the first manufacturing method of the present invention will be described. In the first production method of the present invention, the multilayer annular body is made of various materials (iron-based materials such as steel, or alloy materials such as copper-based, aluminum-based, nickel-based, cobalt-based, and titanium-based) that can be plastically worked. And can be obtained by various methods. For example, when a small-diameter annular metal member (hereinafter, referred to as an “inner annular member”) is fitted into a large-diameter annular metal member (hereinafter, referred to as an “outer annular member”), the outer diameter of the inner annular member is changed to the outer annular member. When the hole diameter is equal to or slightly smaller than the hole diameter of the member, a multilayer annular body (in this case, a two-layer annular body) can be obtained by directly inserting the inner annular member into the hole of the outer annular member. At this stage, a high degree of adhesion is not required. On the other hand, when the outer diameter of the inner annular member is larger than the hole diameter of the outer annular member, conventional fitting methods such as shrink fitting and cold fitting which can be appropriately selected according to the properties of the annular metal member to be used. By applying a proper fitting technique, a desired multilayer annular body can be obtained.

In the first manufacturing method of the present invention, the diameter of the multilayer annular body is increased while the adjacent inner and outer peripheral surfaces of each annular metal member are brought into close contact with each other. This is to perform destruction, separation, or peeling of the oxide film or the like existing on the surface, and at the same time, achieve high adhesion between the newly formed metal surfaces. Various rolling means and rotary forging means suitable for this purpose can be adopted as the diameter increasing / adhering means according to the present invention. Particularly preferred diameter increasing / adhering means is to increase the diameter of the multilayer annular body by ring rolling. This is a method in which an adjacent outer peripheral surface and an inner peripheral surface of each annular metal member are brought into close contact with each other (form 1-1). FIG. 1 is a diagram schematically illustrating a typical example of a manufacturing method according to embodiment 1-1. As shown in FIG. 1, in this embodiment, a multilayer annular body 10A (a two-layer annular body including an inner annular member 11 and an outer annular member 12 in this case).
Is set in a general ring rolling mill, and the multilayer annular body 10 </ b> A is rolled between the main roll 1 and the mandrel (working roll) 2. That is, the main roll 1 and the mandrel 2 are rotated under predetermined pressurizing and heating conditions (typically, not shown, such as a centering roll, an axial roll, etc.) as in the case of ordinary ring rolling for forming various flanges and gear blanks. And rolling is performed while rotating the multilayer annular body 10A synchronously.
Thereby, the relatively small-diameter multilayer annular body 10A as shown in FIG. 2A can be initially enlarged as shown in FIG. 2B. Then, the surface area of the boundary surface 13 between the inner annular member 11 and the outer annular member 12 (that is, the outer peripheral surface of the inner annular member 11 and the inner peripheral surface of the outer annular member 12) is increased due to the increase in the diameter. The oxide film of the present invention can be broken and divided to form a new surface where the original metal material is exposed. In addition, the inner ring-shaped member 11
And the newly formed surfaces formed on the inner peripheral surface of the outer annular member 12 are strongly adhered to each other. The pressure (surface pressure) is typically 400 to 700 M, although it is not particularly limited since it may vary depending on the material of each annular member used.
Temperature in Pa: 800 ° C. or less (preferably room temperature to 300 ° C.)
2C) for a suitable time (typically 0.5 to 2 hours) under the condition of
As shown in (c), it is possible to obtain a joined body in which the boundary surface 13 has disappeared, that is, various flanges, gear blanks and other annular metal joined bodies 10B in which the respective annular metal members are sufficiently metallically joined.

A particularly preferable method as the first manufacturing method of the present invention is that a non-contact portion (that is, the joining surface 13) between the outer peripheral surface of the inner annular member 11 and the inner peripheral surface of the outer annular member 12 is not formed. This is a method characterized by performing the ring rolling while blowing an oxidizing gas (form 1-2). As a typical example, as shown in FIG. 3, the method according to the embodiment 1-2 is based on the multilayer annular body 10 set on a ring rolling mill.
A blow nozzle 3 is arranged near A, and a non-oxidizing gas is blown from the nozzle 3 toward a joining surface 13 (typically, a joining portion directly rolled by the main roll 1 and the mandrel 2). Can be performed. Accordingly, it is possible to highly suppress the generation of a new oxide film on the new surface generated on the bonding surface 13. As the non-oxidizing gas to be blown, various inert gases (Ar or the like) which act to suppress the formation of the oxide film are used.
Or a reducing gas (such as H ₂ ) may be used. Reducing gases such as hydrogen gas are particularly preferred for this purpose.

Next, a preferred embodiment of the second manufacturing method of the present invention will be described. In carrying out the second manufacturing method of the present invention, a part of the insertion member having a substantially circular cross section (typically, one end of a long member formed in an axial shape) is rotated relatively. The shape and material of these members are not particularly limited as long as they can be press-fitted into the insertion opening of the inserted member. In addition to iron-based materials such as general steel, alloy materials such as copper-based, aluminum-based, nickel-based, cobalt-based, and titanium-based materials or ceramic materials having a metalized surface (joining surface) with these metals are used. Insertion members and inserted members can be used in the practice of the present invention. Typically,
As shown in FIG. 4, the end (that is, the illustrated portion) of the long-axis-shaped insertion member 21 is press-fitted into an insertion port 22 b provided in the inserted member 22. At this time, one or both of the insertion member 21 and the inserted member 22 are rotated with the insertion direction as the rotation axis direction (see the rotation arrow in the figure). Typically, such a rotary press-fitting process can be realized by engaging the other end of the insertion member 21 with various rotary driving devices. Then, the insertion member 21 rotated at a predetermined rotation speed is inserted into the insertion port 22 of the insertion target member 22.
b (Form 2-1). Alternatively, the inserted member 22 is fixedly arranged in advance on a mandrel (rotary pedestal) (not shown), and the mandrel is operated at a predetermined rotation speed, and the inserted member 22 is rotated in the opposite direction to the insertion opening 22b of the inserted member 22. The inserted or rotated insertion member 21 may be pressed (form 2-2). The rotational speed and the pressing force at the time of press-fitting are not particularly limited, but when the material of the inserted member 22 and the inserted member 21 is a general carbon steel or an aluminum alloy, the friction pressure is 20 MPa or more. It is preferable to set the rotational speed and other press-fitting conditions so as to be about 50 MPa. In addition, it is preferable to set the press-fitting condition so that the friction time is continued for a predetermined time (typically, 5 seconds or more).

By performing the rotary press-fitting process as described above, friction is generated between the outer wall surface 21a of the insertion member 22 and the inner wall surface 22a in the insertion opening 22b of the inserted member 22, and the frictional heat is generated by the friction. Occurs. By these,
Outer wall surface 21a of inserted member and inner wall surface 22 of inserted member
The oxide film adhering to a can be destroyed and removed. At the same time, both joining surfaces (that is, the outer wall surface 21a of the insertion member and the inner wall surface 22a of the inserted member) can be strongly adhered to each other by plastic deformation of both members accompanying the press-fitting.

Then, in the process of the rotary press-fitting, a metallic connection between both members is realized. That is, by such a rotary press-fitting process, a joined body in which a clear boundary surface does not exist between the inserting member 21 and the inserted member 22 as shown in FIG. 5, that is, a metal joined body in which both members are sufficiently metallically joined. 2
0 can be obtained. Although it is an additional process and is not a particularly necessary process, solid phase bonding such as diffusion bonding may be performed subsequent to the above-described rotary press fitting.

A particularly preferable method as the second production method of the present invention is a method of supplying a powdery abrasive to the outer wall surface of the insertion member during the above-mentioned rotary press-fitting process (typically immediately before press-fitting). It is. Preferably, as shown in FIG. 6 as a typical example, the inserted member is inserted so that the powdery abrasive P can be supplied to the outer wall surface 21a of the inserted member immediately before press-fitting and / or the insertion opening 22b of the inserted member 22. One or a plurality of powdery abrasive supply nozzles 4a and 4b are arranged near the insertion port 22b of the nozzle 22 (form 2-3). According to this embodiment, an appropriate amount of the powdery abrasive P can be supplied and adhered to the inside (the inner wall surface 22a) of the outer wall surface 21a of the insertion member and the insertion opening 22b of the inserted member. This makes it possible to more efficiently remove and peel off the oxide film and generate a new surface in the rotary press-fitting process. The nozzles 4a, 4
The powdery abrasive P supplied from b can be appropriately selected depending on the material of the inserted member and the inserted member. Preferred powdery abrasives for carrying out the present invention include silicon carbide, boron carbide,
A material mainly containing a high-hardness non-oxide such as boron nitride or silicon nitride and having an average particle size of about 100 μm or less can be used.

Next, a preferred embodiment of the third manufacturing method of the present invention will be described. In carrying out the third manufacturing method of the present invention, a part of the outer wall surface of the insertion member and a part of the inner wall surface of the insertion port of the inserted member (typically adjacent to the opening of the insertion port) in the middle of press-fitting the insertion member into the inserted member. The conditions for reversing the level of hardness between the part and the part (including a part) are set in advance, and the press-fitting step is performed in a manner according to the conditions. Other than iron-based materials such as general steel, copper-based, aluminum-based,
An insertion member and a member to be inserted made of a nickel-based, cobalt-based, titanium-based alloy material or the like can be used in the embodiment of the present invention. FIG. 7 is an explanatory diagram graphically showing the transition of the hardness reversal suitable for implementing the third manufacturing method of the present invention. The horizontal axis of this figure indicates the press-in stroke of the insertion member (the distance of the press-fitted insertion member from the insertion port), and the vertical axis indicates the change in the press-in stroke (that is, the progress of the press-in) and the vicinity of the insertion port. It shows the transition of the hardness of the inner wall surface of the inserted member (plot B in the figure) and the change in the hardness of the outer wall surface of the insertion member (A plot in the figure) located immediately before the insertion opening.

In the case where the press-fitting step is carried out according to the above-mentioned condition, the hardness of the inserted member is higher than that of the inserted member before the press-fitting process. As a result, the press-fitting process covers the entire inner wall surface of the inserted member. To break and divide the oxide film,
A new surface can be generated there. On the other hand, as the press-fitting proceeds, the work hardening of the inner wall surface of the inserted member in the vicinity of the insertion port progresses (see the B plot in the figure). Then, at a predetermined time, the hardness of the inner wall surface of the inserted member near the insertion opening exceeds the hardness of the outer wall surface of the inserted member (point R in the figure). That is,
Hardness reversal can occur in such portions. Thus, after such a hardness reversal occurs (that is, at a time after point R where the hardness of B in FIG. 7 exceeds the hardness of A), the outer wall surface of the insertion member inserted into the insertion port is reversed. In addition, the inner wall surface of the hardened inserted member undergoes plastic deformation, and the oxide film on the outer wall surface side of the inserted member is broken / cut to generate a new surface there.

Thus, a new surface in which the original metal substrate is exposed can be formed on both surfaces of the outer wall surface of the insertion member and the inner wall surface of the inserted member. At the same time, both new surfaces can be brought into close contact with each other by a strong pressing force based on the press-fitting.
Thereby, suitable solid-phase bonding (metallic bonding such as interatomic bonding) is generated between the two adhering new surfaces, and a metal bonded body having high bonding strength can be obtained. In addition, although it may vary depending on the material of the inserted member and the inserted member to be used, for example, when using the inserted member and the inserted member made of normal carbon steel, the pressure condition of 400 to 700 MPa and the normal temperature to 300 ° C. It is preferable to set the shape of the member to be used and the press-fitting conditions so that the interference of the insertion member is preferably 0.1 to 1.0 mm under the temperature condition.

In setting the press-fitting conditions according to the third manufacturing method of the present invention, as shown in FIG. 7 described above, the press-fitting of the insertion member is substantially in the middle of the process (ie, almost the entire press-fitting stroke). It is particularly preferable to set a condition such that the hardness of the inner wall surface of the inserted member is higher than the hardness of the outer wall surface of the inserted member at the intermediate position (point R in the drawing). According to such conditions, substantially half of the outer wall surface of the insertion member (ie, close to the insertion port) of the outer wall surface of the insertion member press-fitted by the inner wall surface (that is, the portion near the insertion port) of the inserted member whose hardness is increased by work hardening based on plastic deformation. Side region), a new surface can be generated. As a result, as shown in FIG. 8, strong adhesion between the newly formed surfaces is realized in a substantially half area of the joining surface 33 between the press-fitted insertion member 31 and the inserted member 32 (ie, a region on the root side close to the insertion port 32b). can do. Thus, by performing such press-fitting processing, a bonded body in which a clear boundary surface does not exist between the insertion member 31 and the inserted member 32 in a region on the root side close to the insertion port 32b as shown in FIG. It is possible to obtain a metal joined body 30 in which both members are sufficiently metallically connected. Further, although it is an additional step and is not a particularly necessary processing step, a solid-phase bonding processing such as a diffusion bonding may be performed following the press-fitting processing as described above.

Also, a particularly preferable method as the third manufacturing method of the present invention is characterized in that knurls and other irregularities are formed in a portion of the insertion member to be press-fitted.
1). One typical example is shown in FIG. In the method of the embodiment 3-1, the insertion member 3 is inserted into the insertion opening 32b of the insertion target member 32.
The knurl (irregularity) forming portion 31a at one end is press-fitted under appropriate conditions. Due to the formation of the knurls (irregularities), the contact area between the inner wall surface 32a in the insertion opening 32b and the outer wall surface 31a of the insertion member 31 (that is, the knurl forming portion shown in the drawing) can be increased. The generation area of the new surface on the wall surface 31a and the contact area between the new surfaces can be increased. As a result, it is possible to obtain a metal joined body in which a portion where both members are sufficiently metallically joined to each other is enlarged and the joining strength is more excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a first manufacturing method of the present invention.

FIG. 2 is a diagram illustrating a manufacturing process of a metal joined body manufactured by a first manufacturing method of the present invention. (A)
FIG. 3 is a cross-sectional view showing the diameter of the multilayer annular body before the ring rolling treatment, (b) is a cross-sectional view showing the diameter of the multilayer annular body after the ring rolling treatment, and (c) is an annular shape obtained after the solid phase bonding. It is sectional drawing which shows the state of a metal joined body.

FIG. 3 is an explanatory view showing one embodiment of the first manufacturing method of the present invention.

FIG. 4 is an explanatory view showing one embodiment of a second manufacturing method of the present invention.

FIG. 5 is a sectional view showing a state of a metal joined body obtained by a second manufacturing method of the present invention.

FIG. 6 is an explanatory view showing one embodiment of a second manufacturing method of the present invention.

FIG. 7 is a graph illustrating the relationship between the press-fitting stroke of a preferred insertion member and the hardness of the outer wall surface of the insertion member and the inner wall surface of the inserted member in the third manufacturing method of the present invention.

FIG. 8 is a cross-sectional view showing a state of a metal joined body obtained by a third manufacturing method of the present invention.

FIG. 9 is an explanatory view showing one embodiment of a third manufacturing method of the present invention.

[Explanation of symbols]

 Reference Signs List 10A Multilayer annular body 10B, 20, 30 Metal joined body 11 Inner annular member 12 Outer annular member 13, 33 Joining surface 21, 31 Inserted member 22, 32 Inserted member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tokujiro Konishi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Hiroshi Inoshi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F Terms (reference) 4E067 AA01 BA03 DA01 DB02 EC02 EC06

Claims (5)

[Claims] 1. A step of obtaining a multilayer annular body formed by fitting a plurality of annular metal members having mutually different diameters to each other, and increasing the outer diameter of the entire multilayer annular body while reducing the outer diameter of the multilayer annular body. Production of a metal joined body including a step of closely adhering an adjacent inner peripheral surface and an outer peripheral surface of each annular metal member to be configured, and a step of solid-phase joining the adhered inner peripheral surface and the outer peripheral surface. Method. 2. The method according to claim 1, wherein the contacting step and the joining step are performed while blowing a non-oxidizing gas onto a contact portion between the inner peripheral surface and the outer peripheral surface. 3. A step of press-fitting at least a part of an insertion member having a substantially circular cross section in a rotation state relative to the insertion member into an insertion opening formed in the insertion member. And a step of solid-phase bonding the outer wall surface of the insertion member press-fitted in the rotating state and the inner wall surface of the insertion opening of the inserted member. 4. The manufacturing method according to claim 3, further comprising a step of supplying a powdery abrasive to the outer wall surface of the insertion member and / or the inside of the insertion port at the time of the press-fitting. 5. A step of press-fitting an insertion member having a higher hardness than the inserted member into an insertion opening formed in the inserted member,
And a step of solid-phase bonding at least a part of the outer wall surface of the press-fitted insertion member and the inner wall surface of the insertion port of the inserted member, wherein the press-fitting step is a step of press-fitting the insertion member. At least a portion of the inner wall surface of the insertion port acquires a hardness higher than the hardness of the outer wall surface of the insertion member due to local plastic deformation based on the press-fitting, and is subsequently press-fitted by the portion having the high hardness. A method for producing a metal joined body, wherein the method is performed in such a manner that at least a part of an outer wall surface of the insertion member is cleaned.