JP7333426B2 - Manufacturing method for shaft member having flange and shaft member having flange - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a shaft member having a flange and a shaft member having a flange.

In Patent Document 1, it consists of a cylindrical member (shaft component) and an annular member (gear component) having a through hole to which the cylindrical member can be attached. A technique for diffusion bonding the bonding surfaces of the is disclosed.

JP 2014-91125 A

As disclosed in Patent Document 1, when a cylindrical member is press-fitted into a through-hole of an annular member for diffusion bonding, it is necessary to improve the processing accuracy of the outer peripheral surface of the cylindrical member and the inner peripheral surface of the annular member. In addition, the press-fitting work is also time-consuming, which increases the cost accordingly.

The present invention provides an unprecedented method for manufacturing a shaft member having a flange and a shaft member having a flange, which enables more efficient diffusion bonding of a cylindrical member and an annular member that constitute the shaft member. for the purpose.

The gist of the present invention will be described with reference to the accompanying drawings.

A method for manufacturing a shaft member A having a collar portion 1, comprising:
A cylindrical member 3 having an outer peripheral surface formed with a male threaded portion 2 and an annular member 5 having an inner peripheral surface provided with a female threaded portion 4 to be screwed into the male threaded portion 2 are prepared. a preparatory process to
A fitting step of fitting the annular member 5 onto the cylindrical member 3;
A first flat surface 6 provided in the vicinity of the male screw portion 2 of the cylindrical member 3 and a second flat surface 6 provided in the vicinity of the female screw portion 4 of the annular member 5 and facing the first flat surface 6 a screwing step of screwing the female threaded portion 4 and the male threaded portion 2 so as to bring the flat surface 7 into contact;
The first flat surface 6 is heated while the contact between the first flat surface 6 and the second flat surface 7 is maintained by screwing the male screw portion 2 and the female screw portion 4 together. and a diffusion bonding step of diffusion bonding the second flat surface 7 ,
A shaft member having a flange, characterized in that the cylindrical member 3 has a projection 8 projecting in the outer peripheral direction of the cylindrical member 3 and the first flat surface 6 is formed on the projection 8. It relates to a manufacturing method.

Further, in the method of manufacturing a shaft member having a flange according to claim 1, the first flat surface 6 is the first tapered surface 6, and the second flat surface 7 is the second tapered surface 7. The present invention relates to a method for manufacturing a shaft member having a flange, characterized by:

Further, in the method of manufacturing a shaft member having a flange portion according to any one of claims 1 and 2 , the annular member 5 has the annular second flat surface 7 on the end face in the longitudinal direction. The present invention relates to a method for manufacturing a shaft member having a characteristic flange.

Further, in the method for manufacturing a shaft member having a flange portion according to any one of claims 1 to 3 , the diffusion bonding step includes a first step of performing only diffusion bonding treatment, and a step performed after the first step. The present invention relates to a method for manufacturing a shaft member having a flange, characterized by including a second step of performing diffusion bonding treatment and carburizing and quenching treatment at the same time.

Further, in the method for manufacturing a shaft member having a flange according to any one of claims 1 to 4 , the first flat surface 6 and the second flat surface 7 have a surface roughness Rz of 2 μm or less. The present invention relates to a method for manufacturing a shaft member having a flange, characterized by:

Further, the shaft member A having the collar portion 1,
A cylindrical member 3 having an outer peripheral surface formed with a male threaded portion 2, and an annular member 5 having an inner peripheral surface provided with a female threaded portion 4 to be screwed into the male threaded portion 2 and serving as the collar portion 1. ,
A first flat surface 6 is provided in the vicinity of the male screw portion 2 of the cylindrical member 3, and the first flat surface 6 is a protruding portion 8 protruding in the outer peripheral direction of the cylindrical member 3. is formed in
A second flat surface 7 is provided in the vicinity of the female screw portion 4 of the annular member 5,
The annular member 5 is fitted over the cylindrical member 3, the female screw portion 4 is screwed into the male screw portion 2, and the first flat surface 6 and the second flat surface 7 are diffusion-bonded. The present invention relates to a shaft member having a flange, characterized in that

Further, in the shaft member having a flange according to claim 6 , the first flat surface 6 is the first tapered surface 6, and the second flat surface 7 is the second tapered surface 7. The present invention relates to a shaft member having a characteristic flange.

Further, in the shaft member having a collar portion according to any one of claims 6 and 7 , the annular member 5 has the annular second flat surface 7 on the end surface in the longitudinal direction. The present invention relates to a shaft member having a flange.

According to the present invention, as described above, a novel method for manufacturing a shaft member having a collar portion and a collar portion that enable diffusion bonding of a cylindrical member and an annular member constituting the shaft member to be performed more efficiently are provided. It becomes a shaft member having.

It is a schematic explanatory perspective view of a present Example. It is explanatory drawing of the manufacturing process of a present Example. It is explanatory drawing of the manufacturing process of a present Example. It is explanatory drawing of the manufacturing process of a present Example. It is explanatory drawing of the hardening process of a present Example. It is explanatory drawing of the tempering process of a present Example. It is a schematic explanatory sectional drawing which shows another example.

A preferred embodiment of the present invention will be briefly described with reference to the drawings showing the operation of the present invention.

The annular member 5 is fitted onto the cylindrical member 3, the female threaded portion 4 of the annular member 5 is screwed into the male threaded portion 2 of the cylindrical member 3, and the second flat surface 6 is secured to the first flat surface 6 by tightening by screwing. By pressing the flat surface 7 of this screw engagement, the contact between the first flat surface 6 and the second flat surface 7 is maintained, and in this state (the state in which they are pressed together), the flat surface 6・Diffusion bonding of 7 members is performed.

Therefore, the first flat surface 6 and the second flat surface 7 are pressed against each other without performing troublesome press-fitting work or high-precision machining of the outer peripheral surface of the cylindrical member 3 and the inner peripheral surface of the annular member 5. It is possible to manufacture the shaft member A having the flange portion 1 (flange portion) simply and efficiently without using a separate jig or the like for creating the state.

A specific embodiment of the present invention will be described with reference to the drawings.

This embodiment is a method of manufacturing a shaft member A having a flange portion 1 as shown in FIG.

Specifically, a cylindrical member 3 having a male threaded portion 2 formed on its outer peripheral surface and an annular member provided with a female threaded portion 4 screwed to the male threaded portion 2 on its inner peripheral surface to serve as the collar portion 1 a preparation step of preparing the member 5; a fitting step of fitting the annular member 5 onto the cylindrical member 3; and the female screw portion 4 and the male screw portion 2 are brought into contact with the second flat surface 7 provided in the vicinity of the female screw portion 4 of the annular member 5 and facing the first flat surface 6. and the screwing of the male screw portion 2 and the female screw portion 4 while maintaining the abutment between the first flat surface 6 and the second flat surface 7. A diffusion bonding step of heating and diffusion bonding the first flat surface 6 and the second flat surface 7 is included.

The cylindrical member 3 may be either a solid material or a hollow material. A hollow member is adopted in this embodiment. The cylindrical member 3 is made of a suitable alloy steel, and for example, an SCM material having a C content of about 0.20% or less among various alloy steels can be used.

In this embodiment, for example, a pipe material is used which is obtained by punching a solid material cut into a billet from a long material such as SCM420. In addition, you may employ|adopt a pipe material, such as commercially available SCM420.

The annular member 5 has a flange shape as shown in FIG. 2, and is made of an appropriate alloy steel, for example, an SCM material having a C content of about 0.20% or less among various alloy steels, similar to the cylindrical member 3. etc. can be adopted. Also, considering the degree of adhesion at the time of diffusion bonding, a material having a smaller thermal expansion than the material of the cylindrical member 3 (for example, SUS430 material, etc.) may be adopted.

In this embodiment, a cut pipe material such as SCM420 is used. It should be noted that a billet cut out from a long material such as SCM420 and subjected to a perforating process may be employed.

A male screw portion 2 is provided in a predetermined range at a position a predetermined distance away from one end of the outer peripheral surface of the cylindrical member 3, and the first flat surface 6 is provided on the entire periphery of the terminal end of the male screw portion 2 in the screwing direction. A first tapered surface 6 of is provided. The first tapered surface 6 has an annular shape and is formed by subjecting a protruding portion 8 protruding like a flange from the outer peripheral surface of the cylindrical member 3 to an appropriate tapering process.

Also, the cylindrical member 3 is a pipe with a step on one side. In addition, you may apply other machining suitably. For example, keyway machining or spline rolling may be applied.

A female screw portion 4 is provided on the inner peripheral surface of the annular member 5 . A second tapered surface 7 serving as the second flat surface 7 is provided on the entire circumference of the starting end of the female screw portion 4 in the screwing direction. The second tapered surface 7 has an annular shape and is provided on the end surface of the annular member 5 on the side facing the first tapered surface 6. Specifically, the circumference (entire circumference) of the through hole is tapered. It is formed by

The surface roughness Rz (surface roughness, maximum height) of the first flat surface 6 and the second flat surface 7 (the first tapered surface 6 and the second tapered surface 7) is 2 μm or less, preferably 0 .4 μm to 1.6 μm is preferable. This is because if the thickness is less than 0.4 μm, a dramatic improvement in bonding quality cannot be expected in spite of the high processing difficulty, and if it exceeds 1.6 μm, the bonding quality deteriorates. In this embodiment, Rz is set to 1 μm.

In this embodiment, in order to increase the bonding area as much as possible, the first and second flat surfaces 6 and 7 are formed as the first and second flat surfaces 6 and 7, as shown in the enlarged cross-sectional view of FIG. Although the first and second tapered surfaces 6 and 7 are used, vertical surfaces may be used as shown in FIG. 7 instead of tapered surfaces. For example, one end surface of the projecting portion 8 is the first flat surface 6 which is a vertical surface, and as shown in FIG. A certain second flat surface 7 may be provided, or a vertical second flat surface 7 may be provided flush with the end surface of the annular member 5 as shown in FIG. 7(b).

In this embodiment, the annular member 5 configured as described above is fitted to the cylindrical member 3, the female threaded portion 4 of the annular member 5 is screwed into the male threaded portion 2 of the cylindrical member 3, and tightened by screwing. The second tapered surface 7 is pressed against the first tapered surface 6, and by tightening the screw engagement, the contact between the first tapered surface 6 and the second tapered surface 7 is maintained (both are pressed together). state), the tapered surfaces 6 and 7 are integrated by performing diffusion bonding (see FIG. 3).

Therefore, the annular member 5 that forms the collar portion 1 is firmly attached by not only screwing the threaded portion but also diffusion bonding of the tapered surfaces to prevent rotation. , the flange 1 can be used favorably for positioning and supporting the rotor.

The diffusion bonding process of this embodiment is performed in a heat treatment furnace 9 capable of heat treatment in a vacuum atmosphere or an inert atmosphere as shown in FIG. Further, in this embodiment, carburizing and quenching are performed in the same heat treatment furnace 9 together with diffusion bonding. That is, it includes a first step in which only diffusion bonding is performed, and a second step, after the first step, in which diffusion bonding and carburizing and quenching are performed at the same time.

Specifically, as shown in FIG. 5, after being placed in the heat treatment furnace 9, it waits until a vacuum atmosphere of about 10 ⁻³ Pa to 10 ¹ Pa is reached, and is heated from 900 to 1000° C. degree), and the degree of vacuum and the temperature are kept constant (soaking) for a predetermined time (several tens of minutes to several hours) to perform diffusion bonding (first step).

After that, the carbon-containing gas is introduced into the heat treatment furnace 9 while maintaining the temperature, and the carbon-containing gas concentration and temperature are kept constant for a predetermined time (several tens of minutes to several hours) to perform carburizing treatment (at this time, diffusion The temperature is lowered, held at about 850° C. for a predetermined time (several tens of minutes), cooled with oil, and quenched (second step).

Therefore, by simultaneously performing the carburizing and quenching process in the same heat treatment furnace 9 in the latter half of the diffusion bonding process, efficient treatment is possible even when using alloy steels that require carburizing and quenching.

After being oil-cooled in the heat treatment furnace 9, the shaft member A is moved to an open-air furnace and heated to about 200° C. in the open-air furnace as shown in FIG. ) is held and tempered (tempering step).

The manufacturing process will be described in more detail below.

The cylindrical member 3 configured as described above is manufactured, and the annular member 5 configured as described above is manufactured (preparation step).

Subsequently, the cylindrical member 3 is inserted into the through-hole of the annular member 5 to fit the annular member 5 onto the cylindrical member 3 and moved to the vicinity of the male screw portion 2 (fitting step).

Subsequently, the annular member 5 is rotated to screw the female threaded portion 4 into the male threaded portion 2, and when the screwing is completed such that the starting end of the female threaded portion 4 in the threading direction approximately reaches the terminal end of the male threaded portion 2 in the threading direction. The first tapered surface 6 and the second tapered surface 7 are brought into close contact (threading step).

The degree of close contact due to screwing is appropriately adjusted, and the degree of contact (surface pressure) between the tapered surfaces 6 and 7 is adjusted. For example, the surface pressure can be managed and adjusted by tightening torque (for example, about 20 to 100 N·m).

Then, the tapered surfaces 6 and 7 are introduced into the heat treatment furnace 9 in a state where the tapered surfaces 6 and 7 are pressed against each other with a predetermined pressure, and the inside of the heat treatment furnace 9 is heated in a vacuum atmosphere or an inert atmosphere to perform diffusion bonding and carburizing and quenching. (Diffusion bonding step including first step and second step).

After the diffusion bonding process, the shaft member A is oil-cooled, taken out from the heat treatment furnace 9, introduced into an atmosphere open furnace, and tempered (tempering process).

After the tempering process, the shaft member A is taken out from the open-air furnace to obtain the shaft member A having the collar portion 1 according to this embodiment.

After the above process, the outer surface of the shaft member A is subjected to finishing such as cutting and polishing, and the inner surface of the cylindrical member 3 is subjected to finishing such as cutting and polishing to remove irregularities and the like. may

In this embodiment, the case of using an alloy steel that requires carburizing and quenching has been described, but the shaft member A having the collar portion 1 according to this embodiment may be manufactured using an alloy steel that does not require carburizing and quenching. In this case, the second step of the diffusion bonding step (introduction of the carbon-containing gas) and the tempering step are unnecessary.

Since this embodiment is constructed as described above, the first tapered surface 6 and the second tapered surface 6 can be formed without performing troublesome press-fitting and high-precision machining of the outer peripheral surface of the cylindrical member 3 and the inner peripheral surface of the annular member 5. There is no need to separately use a jig or the like for creating a state in which the two tapered surfaces 7 are pressed against each other, and it is possible to manufacture the shaft member A having the collar portion 1 (flange portion) simply and efficiently. becomes.

In addition, since the cylindrical member 3 and the annular member 5 are manufactured separately, the material yield is high. Further, even when carburizing is required, diffusion bonding can be performed at the same time, so the line configuration can be simplified. , the cost is low.

In addition, compared with the case where the flange portion 1 is formed by cold forging, the flexibility of the material is high, and the strength can be increased. Moreover, compared to cold forging, it consumes less energy and does not require bonder treatment, thus reducing environmental impact. In addition, it is easier to increase the size of the collar portion 1 as compared with cold forging.

Therefore, the present embodiment provides a novel method for manufacturing a shaft member having a flange portion, which enables more efficient diffusion bonding of the cylindrical member and the annular member that constitute the shaft member.

1 collar portion 2 male screw portion 3 cylindrical member 4 female screw portion 5 annular member 6 first flat surface (first tapered surface)
7 second flat surface (second tapered surface)
8 projecting portion A shaft member

Claims (8)

A method for manufacturing a shaft member having a flange, comprising:
a preparation step of preparing a cylindrical member having an outer peripheral surface formed with a male threaded portion, and an annular member having an inner peripheral surface provided with a female threaded portion to be screwed to the male threaded portion and serving as the flange;
a fitting step of fitting the annular member to the cylindrical member;
A first flat surface provided in the vicinity of the male screw portion of the cylindrical member and a second flat surface provided in the vicinity of the female screw portion of the annular member and facing the first flat surface are brought into contact with each other. a screwing step of screwing the female threaded portion and the male threaded portion so that the
The first flat surface and the second flat surface are heated while the contact between the first flat surface and the second flat surface is maintained by screwing the male screw portion and the female screw portion together. A diffusion bonding step of diffusion bonding with a flat surface ,
A method of manufacturing a shaft member having a flange, wherein the cylindrical member has a flange-like protruding portion that protrudes in an outer peripheral direction of the cylindrical member, and the first flat surface is formed on the protruding portion. 2. The method of manufacturing a shaft member having a flange according to claim 1, wherein the first flat surface is a first tapered surface, and the second flat surface is a second tapered surface. A method for manufacturing a shaft member having a flange. 2. The method of manufacturing a shaft member having a flange according to claim 1 , wherein said annular member has said second flat surface annularly on an end face in the longitudinal direction thereof. A method for manufacturing a shaft member having a portion. 4. The method for manufacturing a shaft member having a flange according to claim 1 , wherein said diffusion bonding step comprises a first step of performing only diffusion bonding treatment, and a diffusion bonding treatment performed after said first step. A method of manufacturing a shaft member having a collar, comprising a second step of simultaneously performing a joining treatment and a carburizing and quenching treatment. The method for manufacturing a shaft member having a flange according to any one of claims 1 to 4 , characterized in that the first flat surface and the second flat surface have a surface roughness Rz of 2 μm or less. A method for manufacturing a shaft member having a flange that A shaft member having a flange,
A cylindrical member having an outer peripheral surface formed with a male threaded portion, and an annular member having an inner peripheral surface provided with a female threaded portion that is screwed to the male threaded portion and serving as the flange,
A first flat surface is provided in the vicinity of the male screw portion of the cylindrical member, and the first flat surface is formed on a protruding portion protruding in a flange shape in the outer peripheral direction of the cylindrical member,
A second flat surface is provided in the vicinity of the female screw portion of the annular member,
The annular member is fitted onto the cylindrical member, the female screw portion is screwed onto the male screw portion, and the first flat surface and the second flat surface are diffusion-bonded. A shaft member having a collar portion. 7. A shaft member having a flange according to claim 6 , wherein said first flat surface is a first tapered surface and said second flat surface is a second tapered surface. A shaft member having. 8. The shaft member having a collar according to claim 6 , wherein said annular member has said annular second flat surface on a longitudinal end surface thereof. shaft member.

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