JP2013024324A - Method of manufacturing composite member and the composite member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite member in which a first member can be accurately and strongly fixed to a second member, the composite member being configured by making the second member penetrate the through hole of the first member, so that the first member can be fixed to the second member, and a method of manufacturing the composite member.SOLUTION: According to a method, in a first member 11, a through hole 13 larger than a second member 12 is provided and the second member 12 is made to penetrate the through hole 13. By iteratively generating shearing stress while generating compression stress in the second member 12 within the through hole 13, the second member 12 is partially thickened and by bringing the thickened portion of the second member 12 into pressure-contact with the through hole 13, the first member 11 is fixed to the periphery of the second member 12. A small diameter hole portion 23, a large diameter hole portion 24, and an annular hole inner surface step portion 26 between the small diameter hole portion 23 and the large diameter hole portion 24 are provided in the through hole 13. The second member 12 includes a small diameter shaft portion 33, a large diameter shaft portion 34 and an annular shaft outer surface step portion 22 opposed to the hole inner surface step portion 21 between the small diameter shaft portion 33 and the large diameter shaft portion 34. While bringing the hole inner surface step portion 21 into pressure-contact with the shaft outer surface step portion 22, the second member 12 is thickened.

Description

  The present invention fixes the first member around the second member by passing the second member through the through hole of the first member, partially enlarging the second member, and press-contacting the inner surface of the through hole. The present invention relates to a composite member manufacturing method and a composite member.

  2. Description of the Related Art In recent years, various so-called shaft enlargement techniques have been investigated in which a metal member is enlarged by repeatedly generating shear stress while causing compressive stress.

For example, Patent Document 1 below proposes manufacturing a composite member by joining a metal fitting member having a through hole and a metal shaft having a diameter smaller than the through hole by a shaft enlargement technique.
In Patent Document 1, a shaft is inserted into a through hole of a member to be fitted, and a shearing stress is repeatedly generated while generating a compressive stress on the shaft, and the enlarged shaft penetrates the member to be fitted. By pressing the inner surface of the hole, a member to be fitted is joined to the shaft to produce a composite member.

  In the method of manufacturing a composite member using such a shaft enlargement technique, when a shear stress is repeatedly generated while generating a compressive stress on the shaft, the shaft enlargement rate can be adjusted in a wide range by appropriately adjusting conditions. Therefore, it can be firmly fixed by sufficiently enlarging the shaft with respect to the through hole of the fitted member.

JP 2009-178732 A

However, in the manufacturing method of the composite member using the conventional shaft enlargement technology, there is a case where a slight misalignment or inclination occurs in the fitted member with respect to the shaft during the enlargement processing, and the composite material is stably and highly accurately combined. The member could not be manufactured.
In addition, when the enlargement rate is insufficient for the through-hole of the mating member, the bonding strength between the mating member and the shaft may decrease. The position of the member may be displaced. Further, in such a case, when various heat treatments such as carburizing treatment are performed, it is considered that the position of the fitted member is displaced with respect to the shaft at high temperature.

  Therefore, according to the present invention, when the second member passes through the through hole of the first member and the second member is partially enlarged and fixed, the first member can be accurately and firmly fixed to the second member. It aims at providing the manufacturing method of a composite member, and a composite member. It is another object of the present invention to provide a composite member manufacturing method and a composite member that can prevent the first member from being displaced relative to the second member.

  In the method of manufacturing a composite member of the present invention that achieves the above object, the second member is passed through the through hole of the first member, and a gap is formed in at least a part between the inner surface of the through hole and the outer surface of the second member. The second member is partially enlarged by repeatedly generating shear stress while generating compressive stress in the second member in the through hole, and the enlarged portion of the second member is in pressure contact with the through hole. In the manufacturing method of the composite member that fixes the first member around the two members, the through hole includes a small-diameter hole portion, a large-diameter hole portion, and an annular hole inner surface step portion between the small-diameter hole portion and the large-diameter hole portion. And the second member has a small-diameter shaft portion disposed in the small-diameter hole portion, a large-diameter shaft portion disposed in the large-diameter hole portion, and a hole inner surface step between the small-diameter shaft portion and the large-diameter shaft portion. A ring-shaped outer surface step portion facing the portion, and the second member is enlarged while the hole inner surface step portion and the outer shaft step portion are pressed against each other. It is characterized in that.

In this manufacturing method, the portion of the second member on the small diameter shaft portion side from the stepped portion on the shaft outer surface and the hole inner surface stepped portion of the first member, and the shaft outer surface stepped portion on the larger diameter shaft portion side from the shaft outer surface stepped portion of the second member. It is preferable to generate a compressive stress by applying a compressive load between the part separated from the part.
In that case, the small diameter shaft portion side portion of the second member is held in the one side holder, the large diameter shaft portion side portion of the second member is held in the other side holder, and the one side holder and the outer shaft surface of the second member It is preferable to generate a compressive stress by applying a compressive load between the one side holder and the other side holder with the first member sandwiched between the stepped portion.

Preferably, the large-diameter hole portion is provided with a retaining hole portion having a shape that is smaller on the end opening side of the through hole than the inner surface stepped portion side, and the second member is enlarged to correspond to the retaining hole portion. A retaining shaft is formed.
It is preferable to form a fitting projection corresponding to the fitting recess by providing a fitting recess on the inner surface of the through hole and enlarging the second member.

In this manufacturing method, after enlarging the second member, at least one surface of the first member and the second member can be cut into a predetermined shape.
After enlarging the second member, heat treatment may be applied to at least one of the first member and the second member.

  The composite member of the present invention includes a first member having a through-hole and a second member penetrated by the through-hole, and a fixing portion formed by partially enlarging the second member is formed on the inner surface of the through-hole. In the composite member in which the first member is fixed around the second member by pressure contact, the through hole is formed in an annular shape between the small diameter hole portion, the large diameter hole portion, and the small diameter hole portion and the large diameter hole portion. The second member includes a small-diameter shaft portion disposed in the small-diameter hole portion, a large-diameter shaft portion disposed in the large-diameter hole portion, a small-diameter shaft portion, and a large-diameter shaft portion. An annular off-axis step portion facing the hole inner surface step portion is provided, and the hole inner step portion and the outer shaft step portion are in pressure contact with each other.

In this composite member, the inner surface of the through hole is provided with a retaining hole having a shape in which the cross-sectional shape perpendicular to the axis is smaller than the inner surface stepped portion side on the end opening side of the through hole, and the second member has the retaining hole. It is preferable to provide a retaining shaft portion having a shape corresponding to the portion.
Preferably, the inner surface of the through hole is provided with a fitting recess, and the fixing portion of the second member is provided with a fitting protrusion having a shape corresponding to the fitting recess.

  According to the method for manufacturing a composite member of the present invention, the first member is provided with an annular hole inner surface step portion between the small diameter hole portion and the large diameter hole portion, and the second member is opposed to the hole inner surface step portion. An outer surface step portion is provided in an annular shape, and the second member is enlarged while the inner surface step portion and the outer surface step portion are pressed against each other. Therefore, when enlarging, it is possible to prevent the first member from being displaced or inclined with respect to the second member, and to manufacture a composite member in which the first member is arranged with high accuracy with respect to the second member. it can.

  According to the composite member of the present invention, the first member has an annular hole inner surface step portion between the small diameter hole portion and the large diameter hole portion, and the second member has an annular shaft facing the hole inner surface step portion. An outer surface step portion is provided, and the hole inner surface step portion and the shaft outer surface step portion are in pressure contact. Therefore, there is no position shift or inclination of the first member with respect to the second member, and a composite member in which the first member is arranged with high accuracy with respect to the second member can be provided.

It is sectional drawing of the composite member manufactured by 1st Embodiment of this invention. (A) shows the 1st member and 2nd member which are prepared in the manufacturing method concerning a 1st embodiment, and (b) shows the state where the 2nd member was penetrated to the penetration hole of the 1st member of (a). It is a fragmentary sectional view. (A)-(c) is sectional drawing explaining the process process which enlarges the 2nd member in the manufacturing method which concerns on 1st Embodiment. (A) is a figure explaining the state after enlarging the 2nd member in the manufacturing method which concerns on 1st Embodiment, (b) is a fragmentary sectional view which shows the enlarged part of the 2nd member. (A) is a fragmentary sectional view which shows the state before the enlargement of the 2nd member which concerns on 2nd Embodiment of this invention, (b) is a fragmentary sectional view which shows the state after the enlargement of the 2nd member. (A) is the fragmentary sectional view in another position which shows the state before the enlargement of the 2nd member which concerns on 2nd Embodiment of this invention, (b) is AA sectional drawing of (a).

Hereinafter, several embodiments according to the present invention will be described with reference to the drawings.
[First Embodiment]
First, the composite member manufactured in this embodiment will be described.
As shown in FIG. 1, the composite member 10 includes a first member 11 having a through hole 13 and a second member 12 that is penetrated through the through hole 13 of the first member, and is provided in the second member 12. The first member 11 is fixed around the fixed portion 14.

  The first member 11 is a member provided with a through hole 13 penetrating in a uniaxial direction, and has a sufficient strength against the pressure applied to the inner surface of the through hole 13 when fixed to the second member 12. In this embodiment, the 1st member 11 is a metal rotary body which provided the through-hole 13 in the center, For example, a disc, a pulley, a gear etc. may be sufficient. The through hole 13 has a circular cross section perpendicular to the axis C.

  The 2nd member 12 is a member longer than the through-hole 13 of the 1st member 11, and consists of a material which can be enlarged by repeatedly producing a shearing stress, producing a compressive stress in an axial direction. The second member 12 is, for example, a metal solid or hollow shaft, a pipe, or the like. In this embodiment, the second member 12 is a solid shaft body and has a circular cross section perpendicular to the axis C.

  The fixing part 14 of the second member 12 has a cross-sectional shape orthogonal to the axis C by enlarging the second member by repeatedly generating shear stress while generating compressive stress by a manufacturing method described later. It is the part which did.

Next, a method for manufacturing such a composite member 10 will be described.
In this manufacturing method, as shown in FIGS. 2A and 2B, the first member 11 and the second member 12 having a predetermined shape are prepared, and the second member 12 is passed through the through hole 13. ) To (c), set on the one side holder 16 and the other side holder 17 to give the second member 12 partially enlarged, as shown in FIGS. The first member 11 is fixed around the second member 12. In this embodiment, after that, cutting and heat treatment are performed to manufacture the composite member 10 as shown in FIG.

In the preparation step shown in FIG. 2A, the first member 11 and the second member 12 are prepared.
The first member 11 is provided with a through hole 13 along the axis C. Boss portions 18 and 19 projecting in the center are provided on both end surfaces of the first member 11, and the through hole 13 is provided through the boss portions 18 and 19. The end surface of the boss portion 18 on one side is preferably a surface orthogonal to the axis C. The first member 11 can be prepared in advance.

2B, the through-hole 13 is provided with a small-diameter hole 23 on one side along the axis C, and has a larger diameter than the small-diameter hole 23 on the other side along the axis C. A diameter hole 24 is provided. Further, on the inner surface of the through hole 13 between the small diameter hole portion 23 and the large diameter hole portion 24, a hole inner surface step portion 21 having a shape that decreases from the large diameter hole portion 24 side to the small diameter hole portion 23 side is provided. The hole inner surface step portion 21 is formed in an annular shape and is continuous with the entire inner surface of the through hole 13.
The hole inner surface stepped portion 21 may be formed by a plane orthogonal to the axis C or an appropriate curved surface, but here it is a tapered surface inclined at a constant angle with respect to the axis C.

The large-diameter hole portion 24 is provided with a retaining hole portion 26 having a shape that becomes smaller on the end opening side of the boss portion 19 of the through-hole 13 than on the inner surface level difference portion 21 side.
The retaining hole portion 26 may be provided on a part of the inner surface of the through-hole 13, but here is a tapered surface that extends from the hole inner surface step portion 21 to the entire length of the large-diameter hole portion 24. The diameter of the end opening of the retaining hole 26 is equal to or larger than the diameter of the small diameter hole 23 of the through hole 13.

  In such a first member 11, the hole inner surface stepped portion 21 and the retaining hole portion 26 are formed so that the cross-sectional shapes are reduced in the opposite directions along the axis C. A fitting recess recessed from the retaining hole 26 on the entire circumference is formed.

On the other hand, the second member 12 is provided with a small-diameter shaft portion 33 disposed in the small-diameter hole portion 23 of the through-hole 13 on one side in the direction along the axis C, and the second member 12 penetrates on the other side in the direction along the axis C. A large-diameter shaft portion 34 disposed in the large-diameter hole portion 24 of the hole 13 is provided.
The cross-sectional shape of the small-diameter shaft portion 33 may be any shape as long as it can be disposed in the small-diameter hole portion 23. However, the small-diameter shaft portion 33 of the present embodiment is narrower than the small-diameter hole portion 23 and has a constant cross-sectional shape continuously along the axis C. Yes.
The large-diameter shaft portion 34 is larger than the small-diameter shaft portion 33 and the small-diameter hole portion 23 and has a circular cross-sectional shape corresponding to the large-diameter hole portion 24 of the through-hole 13 and is slightly narrower than the large-diameter hole portion 24. The constant cross-sectional shape is continuous in the direction along C.
The clearance between the small-diameter shaft portion 33 and the small-diameter hole portion 23 of the through-hole 13 and the clearance between the large-diameter shaft portion 34 and the large-diameter hole portion 24 can be appropriately set as long as the later-described enlargement processing is possible. It is. By setting at least one of the fitting accuracy of the small-diameter shaft portion 33 and the small-diameter hole portion 23 and the fitting accuracy of the large-diameter shaft portion 34 and the large-diameter hole portion 24, the mounting operation is performed in an enlargement process described later. It is possible to prevent parts from falling off or shifting during transportation or transportation work.

Between the small-diameter shaft portion 33 and the large-diameter shaft portion 34, an outer-axis step portion 22 that is opposed to the hole inner surface step portion 21 of the first member 11 in the direction along the axis C is provided. The off-axis surface step portion 22 is preferably provided so as to be annularly continuous around the entire side surface of the second member 12.
The outer-axis surface step portion 22 has a shape that decreases from the large-diameter shaft portion 34 side toward the small-diameter shaft portion 33 side, and is formed in a shape that can contact the inner surface step portion 21 in the direction along the axis C. The off-axis surface step portion 22 may be formed by a plane orthogonal to the axis C or an appropriate curved surface, but here it is formed as a tapered surface inclined at a constant angle with respect to the axis C.

  Next, in order to perform the enlargement process using the first member 11 and the second member 12, the second member 12 penetrates the through hole 13 of the first member 11 as shown in FIG. The hole inner surface step portion 21 of the first member 11 is brought into contact with the outer shaft step portion 22 of the second member 12.

  In the enlargement process, as shown in FIGS. 3A to 3C, the second member 12 is generated by repeatedly generating shear stress while generating compressive stress in the second member 12 disposed in the through hole 13. Partially enlarged. In this embodiment, the first member 11 and the second member 12 are held by the one side holder 16 and the other side holder 17, respectively, and a load is applied to the second member 12 via the one side holder 16 and the other side holder 17. Thus, compressive stress and shear stress are generated. An appropriate configuration can be selected for the one side holder 16 and the other side holder 17, and detailed illustration of the configuration is omitted here.

  The one side holder 16 used in this enlargement process holds the boss portion 18 of the first member 11 and one side of the second member 12 protruding from the through hole 13 of the first member 11. Such a one-side holder 16 is configured to be able to load a load along the axis C on one side of the first member 11 and the second member and to be rotatable.

  The other side holder 17 used in the enlargement process holds the other side of the second member 12 so as not to move in the axis C direction. The other side holder 17 can be rotationally driven while holding the other side of the second member 12, and the angle of the second side holder 17 can be adjusted with respect to the second member 12 held by the one side holder 16. In this embodiment, the angle of the other holder 17 can be adjusted around a point on the axis C of the second member 12 disposed in the through hole 13 of the first member 11.

In order to partially enlarge the second member 12 using the one side holder 16 and the other side holder 17, as shown in FIG. 3A, the first member 11 is placed on the one side holder 16 and the other side holder 17. And the 2nd member 12 is hold | maintained and it sets so that the axis line C may become a straight line.
At this time, the end surface of the other holder 17 is disposed at a position separated from the first member 11. The gap between the other side holder 17 and the first member 11 is equal to or greater than the contraction amount of the length of the second member 12 due to enlargement of the second member 12. Thereby, the part arrange | positioned in the through-hole 13 of the 1st member 11 among the 2nd members 12 can fully be enlarged.

  As shown in FIG. 3A, the other side holder 17 is rotationally driven to rotate the first member 11 and the second member 12 together with the one side holder 16 and the other side holder 17 and pressurize by the one side holder 16. Thus, a compressive load is applied to the second member 12.

When a compressive load is applied between the one side holder 16 and the other side holder 17, the first member 11 is held by the one side holder 16, and therefore the inner surface step of the through hole 13 provided in the first member 11. The portion 21 and the off-axis surface step portion 22 of the second member 12 are in pressure contact with each other.
Thereby, the periphery of the hole inner surface step portion 21 and the small diameter hole portion 23 of the first member 11 is sandwiched between the one side holder 16 and the outer-axis step portion 22 of the second member 12, and the pressing force of the one side holder 16 is Is transmitted to the shaft outer surface step portion 22 via the first member 11. The portion on the small diameter shaft portion 33 side of the second member 12 on the outer shaft step portion 22 and the hole inner surface step portion 21 of the first member 11 and the outer shaft step portion 22 of the second member 12 on the larger diameter shaft portion 34 side. A compressive load is applied between the portion spaced from the stepped portion 22 on the shaft outer surface.

Further, as shown in FIG. 3B, the angle θ of the other side holder 17 is changed while continuing the pressurization and rotation. As a result, a shear stress is generated in the second member 12 in a direction intersecting the axis C with the portion disposed in the through hole 13 of the first member 11 as the center. Since the second member 12 is rotating, shear stress that changes in the entire circumferential direction of the second member 12 is repeatedly generated in the second member 12 as the second member 12 rotates. Since the second member 12 is rotated while maintaining the other side holder 17 at a predetermined angle θ with respect to the one side holder 16, a predetermined shear stress that changes periodically is generated evenly in the entire circumferential direction of the second member 12. .
The bending angle θ of the axis C of the part held by the other side holder 17 of the second member 12 is preferably selected according to the material.

  By repeatedly generating the shear stress while generating the compressive stress, the portion disposed in the through hole 13 of the second member 12 is gradually enlarged. During the enlargement process, the state in which the hole inner surface step portion 21 of the first member 11 is in pressure contact with the outer shaft step portion 22 of the second member 12 is maintained.

  As shown in FIG. 3C, after the large-diameter shaft portion 34 of the second member 12 is enlarged over the entire inner surface of the large-diameter hole portion 24 of the through hole 13, the entire axis C of the second member 12 is a straight line. The angle of the other-side holder 17 is changed so that the compression load is released, and the enlargement process is terminated.

Thereafter, as shown in FIG. 4A, the composite member 10 in a state in which the first and second members 12 are integrated from the one side holder 16 and the other side holder 17 is taken out.
In the composite member 10, the enlarged portion of the second member 12 is in pressure contact with the through hole 13, so that the first member 11 is firmly fixed around the second member 12.
As shown in FIG. 4B, the second member 12 is enlarged in the entire through hole 13 in the through hole 13 of the first member 11 as a result of being sufficiently enlarged in the enlargement process. 12 is deformed into a shape corresponding to the inner surface of the through hole 13, and the second member 12 is pressed against the inner surface of the through hole 13 to form the fixed portion 14. Further, a retaining shaft portion 27 corresponding to the retaining hole portion 26 is formed in the fixed portion 14, and a fitting protrusion is formed on the entire circumference between the retaining shaft portion 27 and the shaft outer surface step portion 22.

In this embodiment, after fixing the first member 11 to the second member 12, machining is performed to cut the surfaces of the first member 11 and the second member 12 into a predetermined shape. At this time, as shown in FIG. 4B, the portion 35 and the boss portions 18 and 19 which are enlarged on the outside of the through hole 13 of the first member 11 are removed, and each portion is processed into a desired shape and accuracy. be able to. Further, the first member 11 and the second member 12 can be subjected to a heat treatment such as a quenching process or a carburizing process, and thereafter, additional machining can be performed with a predetermined accuracy.
Thereby, the composite member 10 as shown in FIG. 1 is completed.

In the composite member 10 manufactured in this way, as shown in FIG. 1, the inner surface of the through hole 13 of the first member 11 is provided with an annular hole inner surface step portion 21, and the second member 12 has a hole inner surface step portion 21. The hole inner surface step portion 21 and the shaft outer surface step portion 22 are in pressure contact with each other.
Further, in this composite member 10, as shown in FIG. 4B, a fitting recess is provided on the inner surface of the through hole 13 of the first member 11, and the fixing portion 14 of the second member 12 corresponds to the fitting recess. A fitting protrusion is provided. Further, the inner surface of the through hole 13 of the first member 11 is provided with a retaining hole portion 26 having a shape in which the cross-sectional shape of the through hole 13 decreases toward the other side, and the second member 12 has a retaining hole portion 26. A retaining shaft portion 27 having a corresponding shape is provided.

  When the composite member is manufactured as described above, the first member 11 is provided with the hole inner surface step portion 21 formed in an annular shape between the small diameter hole portion 23 and the large diameter hole portion 24, and the second member 12 Is provided with a ring-shaped outer surface stepped portion 22 opposite to the hole inner surface stepped portion 21, and the second member 12 is enlarged while the hole inner surface stepped portion 21 and the shaft outer surface stepped portion 22 are pressed. For this reason, the first member 11 is maintained in a specific position with respect to the second member 12 during the enlargement process, and the first member 11 can be accurately positioned with respect to the second member 12 to be enlarged. As a result, the first member 11 can be prevented from being displaced or inclined with respect to the second member 12, and the first member 11 is arranged with high accuracy and firmly fixed to the second member 12. The member 10 can be manufactured.

  In this manufacturing method, a compression load is applied in a state where the first member 11 is sandwiched between the one-side holder 16 that holds one side of the second member 12 and the shaft outer surface step portion 22 of the second member 12. Compressive stress is generated. Therefore, the hole inner surface step portion 21 and the off-axis surface step portion 22 can be pressed against each other by a compressive load, and the hole inner surface step portion 21 of the first member 11 is firmly attached to the off-axis surface step portion 22 of the second member 12 when enlarged. Can be pressed. The positional deviation and inclination of the first member 11 with respect to the second member 12 can be prevented more reliably.

  The portion on the small diameter shaft portion 33 side from the off-axis surface step portion 22 of the second member and the hole inner surface step portion 21 of the first member 11, and the shaft outer surface on the large diameter shaft portion 34 side from the off-axis surface step portion 22 of the second member 12. A compressive stress is generated by applying a compressive load between the portion separated from the stepped portion 22. Therefore, the first member 11 can be held at a predetermined position with respect to the second member 12 with a simple configuration. Further, even if the second member 12 is provided with the off-axis surface step portion 22, the entire second member 12 in the through hole 13 can be caused to generate a compressive stress in a balanced manner, and the second member 12 can be uniformly enlarged. Can do.

The large-diameter hole portion 24 is provided with a retaining hole portion 26 that is smaller on the end opening side of the through-hole 13 than the hole inner surface step portion 21 side, and the second member 12 is enlarged to prevent the retaining hole portion 26. A retaining shaft portion 27 corresponding to the above is formed. For this reason, it is possible to prevent the first member 11 from coming off from the second member 12 and coming off after the enlargement.
In particular, a sufficient fitting recess is provided on the inner surface of the through-hole 13 and the second member 12 is enlarged to form a sufficient fitting protrusion. Therefore, the first member 11 can be firmly fixed to the second member 12 after enlargement, and can be reliably prevented from coming off.

In this embodiment, after fixing the first member 11 to the second member 12, the surface of the first member 11 or the second member 12 is cut into a predetermined shape. Therefore, even when an unnecessary portion is enlarged or deformed when the first member 11 is enlarged, the composite member 10 having a desired shape can be obtained with high accuracy.
Moreover, the boss | hub part 18 is provided in the 1st member 11, and the boss | hub part 18 is cut and removed after enlargement. Therefore, the first member 11 can be stably held during the enlargement process, and the enlargement process is easy.
Here, the second member 12 is firmly pressed against the inner surface of the first member 11 as compared with shrink fitting or the like, and the hole inner surface step portion 21 and the shaft outer surface step portion 22 are pressed and locked to be removed. The stop hole portion 26 and the retaining shaft portion 27 are pressed and locked. Therefore, even if the outer surfaces of the first member 11 and the second member are cut, no positional deviation occurs.

  Further, after the first member 11 is enlarged and fixed around the second member 12, the first member 11 and the second member 12 are subjected to heat treatment. Here, the first member 11 is enlarged and fixed in a shape corresponding to the through hole 13 of the second member 12, and the hole inner surface step portion 21 and the shaft outer surface step portion 22 are firmly locked to prevent the hole from coming off. The portion 26 and the retaining shaft portion 27 are firmly locked. Therefore, even if the through hole 13 is expanded due to thermal expansion, the first member 11 is not detached from the second member 12 or is not displaced. Therefore, even if the 1st member 11 is fixed by enlarging the 2nd member 12, heat processing can be performed and desired hardness and a property can be realized.

[Second Embodiment]
2nd Embodiment is an example which manufactures the composite member 10 using the 1st member 11 from which the shape of the inner surface of the through-hole 13 differs from 1st Embodiment.
In the through hole 13 of the first member 11 of this embodiment, as shown in FIG. 5A, the retaining hole as a fitting recess is formed annularly along the inner periphery of the large diameter hole portion 24 of the first member 11. A groove 41 is provided, and the retaining hole 26 is constituted by a side wall on the other side of the retaining groove 41. Further, as shown in FIG. 6A, the large-diameter hole portion 24 of the through hole 13 is provided with a non-rotating groove 43 as a fitting concave portion having a cross-sectional arc shape. Others are the same as in the first embodiment.

The 1st member 11 and the 2nd member 12 which have such a penetration hole 13 can be joined by enlarging the 2nd member partially like 1st Embodiment.
Due to the enlargement of the second member, as shown in FIG. 5B, a retaining protrusion 42 as a fitting protrusion corresponding to the retaining groove 41 is formed, and the retaining protrusion corresponding to the retaining hole 26 is formed. A shaft portion 27 is formed. Further, the retaining protrusion 42 is pressed against the retaining groove 41, and the retaining shaft 27 is pressed against the retaining hole 26. Further, as shown in FIG. 6B, a rotation preventing projection 44 as a fitting projection corresponding to the rotation preventing groove 43 is formed, and the rotation preventing projection 44 comes into pressure contact with the rotation preventing groove 43. Thereby, the composite member 10 can be manufactured.

  Even in such a method of manufacturing a composite member according to the second embodiment, the same effects as those of the first embodiment can be obtained. In addition, since the anti-rotation protrusion 44 is in pressure contact with the anti-rotation groove 43, the first member 11 can be reliably prevented from being displaced in the circumferential direction with respect to the second member 12.

  The first embodiment and the second embodiment can be appropriately changed within the scope of the present invention. In the above description, an example in which the first member 11 and the second member are members each having a circular cross-section perpendicular to the axis C has been described. However, if the first member 11 has a predetermined through-hole 13, the shape is There is no particular limitation. In the above description, the cross-sectional shape orthogonal to the through-hole 13 of the first member 11 and the axis C of the second member 12 is circular. However, the first member 11 can be enlarged by partially enlarging the second member. The present invention can be applied to other shapes as long as the inner surface of the through-hole 13 can be pressed.

In the first embodiment, the retaining hole portion 26 is provided on the entire inner surface of the through hole 13. However, if possible, it can be provided on a part of the inner surface of the through hole 13 in the circumferential direction. In that case, it is possible to obtain both a retaining effect and a rotation preventing effect at the same time.
In the first and second embodiments, the shear stress is repeatedly generated by rotating the second member 12 while maintaining the predetermined angle. However, the shear stress is generated by other methods such as a vibration generator and ultrasonic vibration. It can also be generated repeatedly.

Examples of the present invention will be described below.
Using the first member 11 and the second member 12 of the first embodiment, similarly to the first embodiment, the composite member 10 of the example joined by repeatedly generating shear stress while generating compressive stress, and the shear stress The composite member 10 of the comparative example joined by generating a compressive stress without causing the bonding was confirmed, and the bonding strength was confirmed.

The first member 11 is made of SCr420H, the length of the through-hole 13 is 40 mm, the diameter of the small-diameter hole 23 is 45 mm, the length is 48 mm, the angle of the hole inner surface step portion 21 with respect to the axis C is 45 degrees, and the large-diameter hole The diameter of 24 open ends was 51 mm and the taper angle was about 2 degrees.
The second member 12 was made of SCr420H, the diameter of the small-diameter shaft portion 33 was 48 mm, the diameter of the large-diameter shaft portion 34 was 50 mm, and the angle of the outer-axis surface step portion 22 with respect to the axis C was 45 degrees.

In the embodiment, with the compression load of 600 kN being applied, the angle of the other side holder 17 is changed from 0 degree to 2 degrees, the compression load is increased to 800 kN, and the other side holder 17 is set to 0 degree after a predetermined time. Returned and enlarged.
In the comparative example, enlargement was performed in the same manner as in the example except that the angle of the other holder 17 was not changed.

A similar impact force was applied to the end of the small-diameter shaft portion 33 of the second member 12 with a hammer in the direction of the axis C, and the joining force was compared.
As a result, in the composite member 10 of the comparative example, the second member 12 was easily detached from the first member 11, but in the composite member 10 of the example, the first member 11 was completely displaced with respect to the second member 12. There wasn't.

C axis line 10 composite member 11 first member 12 second member 13 through hole 14 fixing part 16 one side holder 17 other side holder 18, 19 boss portion 21 hole inner surface step portion 22 shaft outer surface step portion 23 small diameter hole portion 24 large diameter hole Part 26 retaining hole part 27 retaining shaft part 33 small-diameter shaft part 34 large-diameter shaft part 41 retaining groove 42 retaining protrusion 43 retaining groove 44 retaining protrusion 44

Claims (10)

The second member is passed through the through hole of the first member, and a gap is provided in at least a part between the inner surface of the through hole and the outer surface of the second member, and compressed to the second member in the through hole. The second member is partially enlarged by repeatedly generating a shear stress while generating a stress, and the enlarged portion of the second member is pressed against the through-hole so that the second member is formed around the second member. In the method of manufacturing a composite member for fixing one member,
The through hole is provided with a small-diameter hole, a large-diameter hole, and a hole inner surface stepped portion formed annularly between the small-diameter hole and the large-diameter hole,
The second member is annularly formed between the small diameter shaft portion disposed in the small diameter hole portion, the large diameter shaft portion disposed in the large diameter hole portion, and the small diameter shaft portion and the large diameter shaft portion. And an off-axis surface step portion facing the hole inner surface step portion,
A method for producing a composite member, wherein the second member is enlarged while the hole inner surface step portion and the shaft outer surface step portion are in pressure contact with each other.   The portion of the second member closer to the smaller diameter shaft than the stepped portion on the outer shaft and the hole inner surface stepped portion of the first member, and the portion of the second member closer to the larger diameter shaft than the stepped outer surface of the second member. The method for producing a composite member according to claim 1, wherein the compressive stress is generated by applying a compressive load between a portion separated from the stepped portion on the outer surface of the shaft.   The one side holder holds the portion on the small diameter shaft portion side of the second member, the other side holder holds the portion on the large diameter shaft portion side of the second member, and the one side holder and the second member The first member is sandwiched between a stepped portion on the outer surface of the shaft and the compressive stress is generated by applying the compressive load between the one side holder and the other side holder. The manufacturing method of the composite member of Claim 2.   The large-diameter hole is provided with a retaining hole having a shape that is smaller on the end opening side of the through-hole than the inner surface stepped portion, and the second member is enlarged to form the retaining hole. 4. The method for manufacturing a composite member according to claim 1, wherein a corresponding retaining shaft portion is formed.   The fitting protrusion corresponding to the said fitting recessed part is formed by providing a fitting recessed part in the inner surface of the said through-hole, and enlarging a said 2nd member, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The manufacturing method of the composite member as described in any one of.   6. The composite member according to claim 1, wherein after enlarging the second member, at least one surface of the first member and the second member is cut into a predetermined shape. Production method.   The method of manufacturing a composite member according to claim 1, wherein after the second member is enlarged, at least one of the first member and the second member is subjected to heat treatment. A first member having a through-hole and a second member penetrating through the through-hole, and pressing a fixing portion formed by partially enlarging the second member against the inner surface of the through-hole; In the composite member in which the first member is fixed around the second member,
The through-hole includes a small-diameter hole, a large-diameter hole, and a hole inner surface stepped portion formed annularly between the small-diameter hole and the large-diameter hole,
The second member is annularly formed between the small-diameter shaft portion disposed in the small-diameter hole portion, the large-diameter shaft portion disposed in the large-diameter hole portion, and the small-diameter shaft portion and the large-diameter shaft portion. And an off-axis surface step portion opposed to the hole inner surface step portion,
The composite member, wherein the hole inner surface step portion and the shaft outer surface step portion are in pressure contact.   The inner surface of the through-hole is provided with a retaining hole having a shape that is smaller on the end opening side of the through-hole than the inner-surface stepped portion side, and the second member has a shape corresponding to the retaining hole. The composite member according to claim 8, further comprising a retaining shaft portion.   The inner surface of the through hole is provided with a fitting recess, and the fixing portion of the second member is provided with a fitting protrusion having a shape corresponding to the fitting recess. Composite member.

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