JP6329720B2 - Composite member manufacturing method, composite member and composite member manufacturing apparatus - Google Patents

Description

  A method for producing a composite member for joining a first member and a second member by partially enlarging a portion of the second member accommodated in the first member and partially enlarging a part of the accommodated second member; The present invention relates to a composite member and a manufacturing apparatus for manufacturing the 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 that of 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 the shaft insertion portion is partially enlarged by repeatedly generating shear stress while generating compressive stress on the shaft, and the shaft is enlarged. Is press-contacted to the inner surface of the through hole of the fitted member, thereby joining the shaft and the fitted member.

JP 2009-178732 A

  However, in the manufacturing method of the composite member using the conventional shaft enlargement technology, the shaft is passed through the through-hole of the member to be fitted, and both ends of the shaft are supported and the compressive stress and shear stress are applied to the intermediate portion. Therefore, the member to be joined cannot be joined to the end portion of the shaft, and the shape of the composite member that can be manufactured is limited.

  Therefore, in the present invention, the first member can be joined to one end of the second member, and the composite member manufacturing method capable of improving the degree of freedom of the shape of the composite member that can be manufactured using the shaft enlargement technique, and such a shape are provided. It aims at providing the composite member which has, and the manufacturing apparatus for manufacturing the said composite member.

The manufacturing method of the composite member of the present invention that achieves the above object includes accommodating a part of the second member in the first member and repeatedly generating shear stress while generating compressive stress in the second member. Is a method of manufacturing a composite member that joins the first member and the second member by pressing the enlarged portion of the second member against the first member. A bottomed hole is formed in the first member. provided, is longer than the depth of the blind hole, the second consisting of the shaft member having one end side tapered shaft portion of the tapered shape is formed to extend in the axial direction, and the other end side extending in the axial direction, the One end side of the member is accommodated in the bottomed hole with a clearance in between, and the end on one end side is brought into contact with the bottom of the bottomed hole in a state where the other end side is disposed outside the bottomed hole, member and supporting the other end of the second member, pressing and rotating while much of the bottomed hole to the axis of the second member In by the load by repeatedly changing the load in the direction of compressing the second member by inclining each other such that the axis line of the first member bends, causing a compressive stress and shear stress on one side of the second member, An enlarged fixed portion is formed on the outer peripheral surface on one end side disposed inside the bottomed hole, and the first member and the second member are formed by pressing the fixed portion only on the inner peripheral surface and the bottom portion of the bottomed hole. you joining.
Even if at least one of the first member and the second member is a composite member made of a brittle material, it is applicable.

In the manufacturing method of the present invention, an annular jig surrounding the outer peripheral surface is disposed on the outer peripheral surface corresponding to the bottomed hole in the first member, and the load is applied by bringing the outer peripheral surface and the inner peripheral surface of the annular jig into contact with each other. to load is not good.

The taper angle α of the taper shaft is preferably in a range satisfying the following expression (1).
(Σ / σc) <(1-2 · (L / D) · tan α) 2 (1)
(Where α is the taper angle with respect to the axis of the second member, σ is the stress generated by the original diameter of the second member during processing, σc is the compressive fracture strength of the material of the second member, and L is accommodated in the bottomed hole. The length of the second member, D is the diameter of the original diameter .)

The composite member manufacturing apparatus of the present invention includes a first member having a bottomed hole, and a second member having one end accommodated in the bottomed hole, and an end on one end side of the second member has a bottomed hole. A fixed member formed by abutting the bottom and partially enlarging the second member is pressed against the inner peripheral surface of the bottomed hole to produce a composite member in which the first member and the second member are joined. A first holder that supports the first member, and a second holder that supports the other end of the second member, and applies a load in the compression direction between the first holder and the second holder. The first holder and the second holder can be rotated while the axis of the first member supported by the first holder and the axis of the second member supported by the second holder are inclined.
It is advantageous if an annular jig having an inner peripheral surface disposed on the outer peripheral surface corresponding to the bottomed hole in the first member and having an inner peripheral surface in contact with the outer peripheral surface is provided.

According to the composite member manufacturing method of the present invention, the first member is provided with a bottomed hole, the one end of the second member is accommodated in the bottomed hole, and the end on the one end is abutted against the bottom of the bottomed hole. In the state of contact, the load in the direction in which the second member is compressed is repeatedly changed between the first member and the other end of the second member. Therefore, a sufficient load can be applied to an appropriate position of the second member to generate a shear stress repeatedly while generating a compressive stress. Thereby, the one end side of the second member can be enlarged, and the one end side of the second member can be press-contacted to the bottomed hole of the first member.
Accordingly, the first member can be joined to one end of the second member, and the degree of freedom of the shape of the composite member that can be manufactured using the shaft enlargement technique can be improved.

According to the composite member of the present invention, the end portion of the second member is in contact with the bottom of the bottomed hole, and the fixing portion formed by partially enlarging the second member is on the inner peripheral surface of the bottomed hole. The first member is joined to the end of the second member by pressure contact. Therefore, by selecting the shape of the first member, it is possible to easily realize a shape that is difficult to form by the enlargement processing of the second member.
Therefore, it is possible to provide a composite member in which the first member having various shapes is joined to one end of the second member. Therefore, by providing various shapes at one end, it is possible to freely select the end shape of the composite member manufactured using the shaft enlargement technique, and the degree of freedom of the shape can be improved.

According to the composite member manufacturing apparatus of the present invention, the first holder for supporting the first member and the second holder for supporting the other end side of the second member are provided. A load in the compression direction can be applied between the first holder and the second holder, and the axis of the first member supported by the first holder and the axis of the second member supported by the second holder are inclined. In the state, the first holder and the second holder are rotatable. Therefore, the second member can be easily enlarged, and the first member having the bottomed hole and the second member having one end accommodated in the bottomed hole can be easily joined.
Therefore, the manufacturing apparatus which can manufacture easily the composite member by which the 1st member was joined to the end of the 2nd member can be provided.

It is sectional drawing of the composite member which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the fitting state of the 2nd member to the 1st member which concerns on 1st Embodiment. It is a general | schematic fragmentary sectional view of the manufacturing apparatus of the composite member which concerns on 1st and 2nd embodiment. It is a figure explaining the effect | action of the annular jig in the manufacturing apparatus of FIG. 3, (a) shows the state which does not use an annular jig, (b) shows the state which uses an annular jig. It is sectional drawing of the composite member which concerns on 2nd Embodiment. It is sectional drawing which shows the fitting state of the 2nd member to the 1st member which concerns on 2nd Embodiment.

Hereinafter, several embodiments according to the present invention will be described with reference to the drawings.
[First Embodiment]
The composite member 10 of 1st Embodiment is provided with the 1st member 11 which has the bottomed hole 13, and the 2nd member 21 by which the one end side was accommodated in the bottomed hole 13, as shown in FIG. The end 22 on the one end side of the second member 21 abuts on the bottom 14 of the bottomed hole 13, and the fixing portion 23 of the second member 21 is in pressure contact with the inner peripheral surface 15 of the bottomed hole 13. The first member 11 is joined to the end 22 side of 21.

The first member 11 has a bottomed hole 13 having a circular cross section perpendicular to the axis C, and the outer shape is arbitrary, but is larger than one end side of the second member 21.
In the second member 21, the depth of the bottomed hole 13 is longer, the one end side can be accommodated in the bottomed hole 13, and the cross section perpendicular to the axis C is circular. For example, it may be a solid or hollow shaft body, a pipe, or the like, and is a solid shaft body here.

  The fixing part 23 of the second member 21 is formed by enlarging one end side of the second member 21 and increasing the cross-sectional shape orthogonal to the axis C. The tissue of the fixed part 23 may be different from other parts by enlarging.

  The second member 21 is made of a material that can be enlarged by repeatedly generating a shear stress while generating an axial compressive stress. The first member 11 is made of a material having sufficient strength against the load applied from the second member 21 when the second member 21 is enlarged.

The first member 11 and the second member 21 may be made of different materials or the same material. In the first embodiment, the first member 11 and the second member 21 are examples made of a brittle material. The brittle material is a material that breaks without yielding a large plastic deformation after yielding. Examples thereof include tungsten, molybdenum, a quenching material, and various ceramics. In this embodiment, the brittle material is formed of tungsten.
When the first member 11 and the second member 21 are formed of a brittle material, when a shear stress is repeatedly generated while generating a compressive stress, the first member 11 or the second member 21 is easily damaged and is larger than a material such as a metal having a malleability. It is difficult to make it. However, in the present embodiment, the second member 21 is enlarged in the bottomed hole 13 of the first member 11 even if it is made of a brittle material by enlarging by the method described later. A composite member obtained by joining the second member 21 is obtained.

Next, a method for manufacturing such a composite member 10 will be described.
In this manufacturing method, as shown in FIG. 2, the first member 11 and the second member 21 having a predetermined shape are prepared, and one end side of the second member 21 is inserted into the bottomed hole 13, and as shown in FIG. The second member 21 is partially enlarged using the manufacturing apparatus 30 to join the first member 11 and the second member 21 together. In this embodiment, further processing and processing may be performed.

  In the preparation process of the first member 11 and the second member 21, the first member 11 having a desired outer shape and having the bottomed hole 13 along the axis C is prepared in advance. The shape of the bottomed hole 13 is a shape corresponding to one end side of the second member 21, and the bottom portion 14 is preferably formed of a plane orthogonal to the axis C. The depth can be appropriately set according to the outer shape and material of the first member 11, the thickness of the second member 21, the use of the composite member 10, and the like.

  As the second member 21, the other end side has a desired outer shape, one end side can be accommodated in the bottomed hole 13, and the end part 22 has a shape capable of contacting the bottom part 14 of the bottomed hole 13. prepare. The end portion 22 on the one end side of the second member 21 is preferably composed of a plane orthogonal to the axis C.

A tapered shaft portion 24 having a tapered shape may be provided on one end side of the second member 21 accommodated in the bottomed hole 13. When the 2nd member 21 consists of a brittle material like this embodiment, the reliable joining of the 1st member 11 and the 2nd member 21 is realizable by providing the taper shaft part 24. FIG.
That is, if the second member 21 has a straight shape without providing a tapered shaft at one end thereof, the vicinity of the mouth 16 of the bottomed hole 13 preferentially enlarges, and the vicinity of the bottom of the bottomed hole 13 enlarges. It's hard to make it. This is because compressive stress and shear stress are necessary for enlargement, but it is difficult to obtain sufficient shearing force on the end 22 side. Under the conditions that cause the same compressive stress, This is because it becomes difficult to enlarge. In an extreme case, only the vicinity of the mouth portion 16 of the bottomed hole 13 may be enlarged, and the enlargement of the bottom side of the bottomed hole 13 may not progress.
However, when the taper shape is used, even if the load applied to the second member 21 during processing is the same, the stress can be further increased by reducing the cross-sectional area on the end portion 22 side. The end 22 side can be easily enlarged by compressive stress necessary for enlargement in the vicinity of the mouth portion 16.

In this embodiment, by appropriately setting the taper angle α with respect to the axis C of the taper shaft portion 24, the second member 21 can be enlarged in a wide range while preventing damage to the second member 21 during the enlargement process.
The larger the taper angle α, the easier it is to enlarge the end 22 side. On the other hand, if the taper angle α is excessively large, the second member 21 may be broken. Therefore, the taper angle α is preferably set so that the following expression (1) is satisfied.
(Σ / σc) <(1-2 · (L / D) · tan α) ² (1)
(Where α is the taper angle with respect to the axis of the second member 21, σ is the stress generated at the original diameter at the other end of the second member 21 during enlargement processing, and σc is the compressive fracture strength of the material of the second member 21. , L is the length of the second member 21 accommodated in the bottomed hole 13, and D is the diameter of the original diameter of the second member 21.)

This condition is derived as follows. First, when the pressure P is applied to the diameter d of the tip of the second member 21, the tip is not damaged as follows.
P / ((πd ² ) / 4) <σc (2)
(Where σc is the compressive fracture strength of the material.)
The diameter d of the tip of the second member 21 can be expressed as follows using the original diameter D, the length L of the tapered portion, and the taper angle α.
d = D− (2 · L · tan α) (3)
Therefore, equation (2) can be expressed as follows.
P <σc · ((πd ² ) / 4) · (1-2 · (L / D) · tan α) ² (4)
Therefore, when the processing stress generated at the original diameter during the enlargement processing is σ, the above equation (1) is obtained.

  For example, when the second member 21 is tungsten, the compressive fracture strength (σc) is 1500 MPa, and the ratio of the original diameter (D) that is the diameter of the other end of the second member 21 to the depth (L) of the bottomed hole 13. Assuming that (L / D) is 1.5 and the stress (σ) generated in the original diameter by the load applied from the apparatus during the enlargement process is 850 MPa, the taper angle (α) on the one end side of the second member 21 is 4.5 degrees. Less than.

  The bottomed hole 13 of the first member 11 does not need to be tapered, but in this embodiment, a taper corresponding to the tapered shaft portion 24 is provided.

A clearance m may be provided between the inner peripheral surface of the bottomed hole 13 of the first member 11 and the outer peripheral surface on one end side of the second member 21. When the clearance m is provided, the second member 21 can be enlarged by an amount corresponding to the clearance m at the time of enlargement processing, and the second member 21 is surely enlarged, and the inside of the bottomed hole 13 of the first member 11 is increased. It can be pressed against the peripheral surface.
The size of the clearance m can be appropriately set according to the material and shape of the first member 11 and the second member 21, the use of the composite member 10, and the like.

  Next, in the enlargement processing step, a load is applied to one end side of the second member 21 using the manufacturing apparatus 30 for the composite member 10 as shown in FIG. 3 to enlarge the second member 21.

The manufacturing apparatus 30 includes a first holder 31 that supports the first member 11 and a second holder 32 that supports the other end of the second member 21.
The 1st holder 31 has the 1st holding part 36 which can support the edge part of the one end side of the 1st member 11, and the side peripheral surface of the 1st member 11 so that relative movement is impossible. The 2nd holder 32 has the 2nd holding part 37 which can support the edge part of the other end side of the 2nd member 21 so that relative movement is impossible. Appropriate configurations can be selected for the first holder 31 and the second holder 32, and the detailed configuration is not shown in FIG.

  The first holder 31 and the second holder 32 can be driven to rotate about the axis C. For example, when the second holder 32 is driven to rotate, the first holder 31 is rotated about the axis C following the second holder 32. To do. The first holder 31 can be inclined with respect to the second holder 32, and the first holder 31 is supported by the first holder 31 with respect to the axis C of the second member 21 supported by the second holder 32. It is possible to incline the axis C at a predetermined angle. Furthermore, in this embodiment, the second holder 32 can be pressurized toward the first holder 31 along the axis C.

  The manufacturing apparatus 30 includes an annular jig 33 that surrounds the outer peripheral surface corresponding to the bottomed hole 13 in the first member 11. The inner peripheral surface of the annular jig 33 is formed in a size that fits into the outer periphery of the first member 11 by hydraulic pressure or the like, and preferably has a length corresponding to the depth of the bottomed hole 13. The fitting holder 34 provided around the first holding portion 36 of the first holder 31 is supported so as not to move during the enlargement process.

The annular jig 33 is fitted to or tightened to the outer periphery of the first member 11 and applies a compressive load to the first member 11 from the outer periphery.
When a load is applied without mounting the annular jig 33, various stresses generated in the second member 21 disposed in the bottomed hole 13 are combined, and the stress distribution in the longitudinal direction is combined as shown in FIG. Occurs. Here, at the base portion 16 of the bottomed hole 13, it increases sharply due to Hertzian stress. Stress concentration due to Hertz stress in the mouth portion 16 of the bottomed hole 13 of the first member 11 causes cracking of the first member 11 and deformation of the mouth portion 16 of the bottomed hole 13.

  However, as shown in FIG. 4B, if the annular jig 33 is attached and a load is applied, the stress concentration due to the Hertz stress in the lip 16 can be canceled by the compressive load and relaxed. It is possible to moderate the stress distribution and prevent cracking of the first member 11 and deformation of the mouth 16 of the bottomed hole 13 during enlargement processing. Moreover, when the 2nd member 21 enlarges, when the internal pressure increases, the crack of the 1st member 11 and the deformation | transformation of the mouth part 16 of the bottomed hole 13 can be prevented.

In order to partially enlarge the second member 21 using such a manufacturing apparatus 30, the following is performed.
First, as shown in FIG. 2, one end of the second member 21 is accommodated in the bottomed hole 13, and the end 22 of the second member 21 is brought into contact with the bottom 14 of the bottomed hole 13.
As shown in FIG. 3, the other end side of the second member 21 is supported by the second holding portion 37 of the second holder 32, and the annular jig 33 is attached to the outer peripheral surface corresponding to the bottomed hole 13 in the first member 11. The first member 11 is supported by the first holding portion 36 of the first holder 31. Further, the annular jig 33 is received and supported in the fitting recess 34 of the first holder 31. As a result, the first member 11 and the second member 21 are set in the manufacturing apparatus 30 such that the axis C of the first holding portion 36 of the first holder 31 and the second holding portion 37 of the second holder 32 are straight. .

  The first holder 31 and the second holder 32 are driven to rotate, the first member 11 and the second member 21 are rotated, and the second holder 32 is pressurized. At this time, the first member 11 is supported by the first holder 31, and the end 22 of the second member 21 is in contact with the bottom 14 of the bottomed hole 13 of the first member 11. A load in the compression direction is applied, and an axial compression stress is generated in the second member 21. The compressive stress is appropriately selected within a range in which at least the second member 21 can be enlarged and the compressive fracture strength σc or less does not cause buckling of the second member 21.

While continuing the pressurization and rotation, the angle θ of the second holder 32 is changed. At this time, the first holder 31 is inclined so as to have an angle θ with respect to the axis C on the other end side of the second member 21 supported by the second holder 32.
Then, a load in the direction of compressing the second member 21 is repeatedly applied to one end side of the second member 21 disposed in the bottomed hole 13 of the first member 11, and a shear stress in a direction intersecting the axis is applied. Is repeatedly generated. Since the second member 21 is rotating, shear stress that changes in the entire circumferential direction of the second member 21 with the rotation is repeatedly generated in the second member 21. Since the second holder 21 is rotated with the second holder 32 maintained at a predetermined angle θ with respect to the first holder 31, a predetermined shearing stress that periodically changes is evenly generated in the entire circumferential direction of the second member 21.
The bending angle θ between the axis C of the second member 21 held by the second holder 32 and the axis C of the second member 21 held by the first holder 31 should be selected according to the shape, material, and the like. .

In this manner, when the shear stress is repeatedly generated while generating the compressive stress in the second member 21, the stress of the second member 21 disposed in the bottomed hole 13 is caused by the combined stress of the compressive stress and the shear stress. One end is gradually enlarged.
Since the taper-shaped taper shaft part 24 is formed in the one end side of the 2nd member 21 accommodated in the bottomed hole 13 at this time, the one end side can be enlarged in a wide range. Moreover, since the clearance m is provided between the inner peripheral surface of the bottomed hole 13 of the first member and the outer peripheral surface on one end side of the second member 21, the one end side of the second member 21 can be surely enlarged. Further, since the annular jig 33 is mounted around the outer periphery of the first member 11 and a load is applied, cracking of the first member 11 and deformation of the mouth portion 16 of the bottomed hole 13 are prevented during the enlargement process. .

If the enlargement is continued in this state, the enlarged portion on the one end side of the second member 21 is deformed into a shape corresponding to the inner surface of the bottomed hole 13, and the one end side of the second member 21 is substantially entirely in the bottomed hole 13. The fixing part 23 is formed by pressure contact.
Thereafter, the composite member 10 in which the first member 11 and the second member 21 are integrated is taken out from the first holder 31 and the second holder 32, and the enlargement process is finished. In the obtained composite member 10, the first member 11 is firmly attached to the second member 21 because the fixing portion 23 formed by enlarging the second member 21 presses against the inner peripheral surface 15 of the bottomed hole 13. It is fixed.

In this embodiment, after fixing the first member 11 to the second member 21, machining may be performed to cut the surfaces of the first member and the second member into a predetermined shape. At this time, the part enlarged on the outside of the bottomed hole 13 of the first member 11 can be removed, and each part can be processed into a desired shape and accuracy.
Thereby, the composite member 10 as shown in FIG. 1 is manufactured.

In the manufacturing method of the composite member 10 as described above, the bottomed hole 13 is provided in the first member 11, one end side of the second member 21 is accommodated in the bottomed hole 13, and the end 22 is the bottom of the bottomed hole 13. In this state, the load in the direction in which the second member 21 is compressed is repeatedly changed and loaded between the first member 11 and the other end of the second member 21. Therefore, a sufficient load can be applied to an appropriate position of the second member 21 to repeatedly generate a shear stress while generating a compressive stress. Thereby, the one end side of the 2nd member 21 can be enlarged, and the one end side of the 2nd member 21 can be press-contacted to the bottomed hole 13 of the 1st member 11. FIG.
Therefore, it is possible to join the first member 11 to one end of the second member 21. Therefore, the end part shape of the composite member 10 can be freely selected by selecting various shapes as the first member 11, and the degree of freedom of the shape of the composite member 10 that can be manufactured using the shaft enlargement technique can be improved. .

  In this manufacturing method, since the clearance m is provided between the bottomed hole 13 of the first member 11 and the one end side of the second member 21, the second member 21 is accommodated in the bottomed hole 13. Can be concentrated on the portion of the second member 21 disposed in the bottomed hole 13. Therefore, the second member 21 can be reliably joined to the bottomed hole 13 of the first member 11 by actively enlarging the portion arranged in the bottomed hole 13.

  An annular jig 33 surrounding the outer peripheral surface is arranged on the outer peripheral surface corresponding to the bottomed hole 13 in the first member 11, and the outer peripheral surface and the inner peripheral surface of the annular jig 33 are brought into contact with each other to apply a load. Yes. For this reason, even during the enlargement process, even if the second member 21 is in a so-called “twisting” state in the bottomed hole 13 or the second member 21 is enlarged and the internal pressure increases, the first member 11 and the deformation of the mouth portion 16 of the bottomed hole 13 can be prevented, and the first member 11 and the second member 21 can be stably joined with sufficient contact pressure.

  A tapered taper shaft portion 24 is formed on one end side of the second member 21 accommodated in the bottomed hole 13, and a load is applied between the other end side of the second member 21 and the first member 11. Yes. Therefore, it is possible to enlarge the one end side of the second member 21 entirely within the bottomed hole 13 of the first member 11, and one end side of the second member 21 on the inner surface of the bottomed hole 13 of the first member 11. Can be pressed in a wider range. As a result, the bonding strength between the first member 11 and the second member 21 can be improved.

  According to the composite member 10 of the present invention, the fixed portion 23 formed by the end portion 22 of the second member 21 contacting the bottom portion 14 of the bottomed hole 13 and the second member 21 partially enlarged is provided. The first member 11 is joined to the end 22 of the second member 21 in pressure contact with the inner peripheral surface of the bottom hole 13. Therefore, by selecting the shape of the first member 11, it is possible to easily realize an end shape that is difficult to form only by the enlargement processing of the second member 21.

  According to the manufacturing apparatus 30 of the composite member 10 of the present invention, the first holder 31 that supports the first member 11 and the second holder 32 that supports the other end of the second member 21 are provided. A compression load can be applied between the first holder 31 and the second holder 32, and the axis C of the first member 11 supported by the first holder 31 and the axis of the second member 21 supported by the second holder 32. The first holder 31 and the second holder 32 are rotatable with C tilted. Therefore, the second member 21 can be easily enlarged, and the first member 11 having the bottomed hole 13 and the second member 21 having one end accommodated in the bottomed hole 13 can be easily joined.

[Second Embodiment]
FIG. 5 shows the composite member of the second embodiment.
In the composite member 10 of the second embodiment, the first member 11 and the second member 21 are formed of a material such as copper, aluminum, or mild steel having a higher ductility than the brittle material of the first embodiment. Then, the bottomed hole 13 of the first member 11 has a tapered reverse taper shape that becomes thicker toward the bottom 14 side, and the fixing portion 23 of the second member 21 is a reverse taper corresponding to the bottomed hole 13 having a reverse taper shape. It is formed into a shape.

Even in this composite member 10, the fixing part 23 is formed by enlarging one end side of the second member, and the side peripheral surface of the fixing part 23 is in pressure contact with the inner peripheral surface of the bottomed hole 13 of the first member 11. Thus, the first member 11 and the second member are firmly fixed.
Since the bottomed hole 13 has a reverse taper shape, when the first member 11 and the second member 21 are joined by the fixing portion 23 of the second member 21, the second member is removed from the bottomed hole 13 of the first member 11. It is possible to reliably prevent one end side of 21 from coming off.
Other configurations are the same as those of the first embodiment.

  In order to manufacture such a composite member 10 of the second embodiment, the first member 11 and the second member 21 made of a material having spreadability are used, and the preparation process and the enlargement processing process are substantially the same as in the first embodiment. To implement.

  In the preparation step, as shown in FIG. 6, a first member 11 provided with a bottomed hole 13 having a reverse tapered hole shape having a circular cross section perpendicular to the axis C and thickening toward the bottom 14 side is prepared. As the two members 21, one having a straight shaft having a circular cross section perpendicular to the axis C and a constant longitudinal axis is prepared.

In the enlargement processing step, one end side of the second member 21 is accommodated in the bottomed hole 13 of the first member 11 using the same manufacturing apparatus as in FIG. 3, and the second member 21 is placed on the bottom portion 14 of the first member 11. The first holder 31 and the second holder 32 hold the end portion 22 in contact with each other. The first holder 31 and the second holder 32 are operated in the same manner as in the first embodiment, and a shear stress is repeatedly generated while generating a compressive stress on one end side of the second member 21, and one end side of the second member 21 is To enlarge.
At this time, the annular jig 33 may be used. However, in a material such as copper, aluminum, or mild steel having high extensibility, stress concentration due to Hertz stress is generated at the mouth portion of the bottomed hole 13 of the first member 11. Is unlikely to occur. For this reason, the annular jig 33 may not be used for the first holder 31.
In the second embodiment, since the first member 11 and the second member 21 are made of a material that is more extensible than the first embodiment, the applied pressure of the first holder 31 and the amount of inclination of the second holder 32 can be increased. it can.

  By continuing the enlargement process, the enlarged portion on the one end side of the second member 21 is deformed into a shape corresponding to the inner peripheral surface of the bottomed hole 13, and one end of the second member 21 is formed substantially in the bottomed hole 13. The fixing part 23 is formed by pressure contact with each other. The first member 11 is firmly fixed to the second member 21 by the fixing portion 23 being in pressure contact with the inner peripheral surface 15 of the bottomed hole 13, thereby completing the enlargement processing step.

  In this embodiment, machining is then performed, and the surfaces of the first member and the second member may be cut into a predetermined shape, and one or both of the first member 11 and the second member 21 are quenched or carburized. You may perform heat processing, such as.

  Other points are the same as in the first embodiment.

Even in the second embodiment, the same effects as those in the first embodiment can be obtained.
That is, one end of the second member 21 is accommodated in the bottomed hole 13, and the end 22 is brought into contact with the bottom 14 of the bottomed hole 13 to apply a load. Therefore, a sufficient load can be applied to an appropriate position of the second member 21 to repeatedly generate a shear stress while generating a compressive stress, and a cross-sectional shape larger than that of the second member 21 at one end of the second member 21. The 1st member 11 which has can be joined.
In addition, a clearance m is provided between the bottomed hole 13 of the first member 11 and one end side of the second member 21, and the second member 21 is accommodated in the bottomed hole 13 and subjected to enlargement processing. The second member 21 can be enlarged and securely joined in the bottomed hole 13.

  In particular, in the second embodiment, unlike the first embodiment in which a brittle material is used for the first member 11 and the second member 21, the first member 11 and the second member 21 have expandability. Even if the bottomed hole 13 has an inversely tapered shape that becomes thicker toward the bottom 14 side, the bottomed hole 13 can be sufficiently enlarged in the bottomed hole 13. Therefore, the 1st member 11 and the 2nd member 21 can be joined reliably.

  Moreover, since the bottomed hole 13 of the first member 11 has a reverse taper shape that becomes thicker toward the bottom 14 side, the second member 21 is enlarged and joined in a shape corresponding to the shape of the bottomed hole 13. As a result, the second member 21 is reliably prevented from coming off from the first member 11. Therefore, for example, even if heat treatment is performed after the first member 11 and the second member 21 are joined, the second member 21 can be reliably prevented from coming out of the bottomed hole 13 from the first member 11.

The first and second embodiments can be appropriately changed within the scope of the present invention.
For example, in the first and second embodiments described above, in the case of a brittle material, one end side of the second member 21 is formed in a tapered shape and joined, and in the case of a spreadable material, the bottomed hole 13 of the first member 11 is formed. It formed in the reverse taper shape and joined. However, if the first member 11 and the second member 21 can be joined, even if it is a brittle material, one end side of the second member 21 is made straight or the bottomed hole 13 of the first member 11 is reverse tapered. It is possible to Moreover, even if it is a malleable material, the one end side of the 2nd member 21 and the bottomed hole 13 of the 1st member 11 can be made into a taper-shaped taper shape.

C axis α taper angle σ stress generated by original diameter σ c compressive fracture strength L accommodation length D original diameter d d diameter at tip m clearance 10 composite member 11 first member 13 bottomed hole 14 bottom 15 inner peripheral surface 16 mouth 21 Second member 22 End portion 23 Fixed portion 24 Tapered shaft portion 30 Manufacturing apparatus 31 First holder 32 Second holder 33 Annular jig 34 Fitting recess 36 First holding portion 37 Second holding portion

Claims (6)

A part of the second member is accommodated in the first member, and the second member is partially enlarged by repeatedly generating a shear stress while generating a compressive stress in the second member, and the second member is enlarged. A manufacturing method of a composite member that joins the first member and the second member by pressing the part to the first member,
Providing a bottomed hole in the first member;
The formed longer than the depth of the blind hole, and one end side of the tapered shaft portion of the tapered shape is formed to extend in the axial direction, the first consisting shaft having a second end extending in the axial direction The one end side of the two members is accommodated in the bottomed hole with a clearance therebetween, and the end on the one end side is the bottom of the bottomed hole in a state where the other end side is disposed outside the bottomed hole. Abut,
The first member and the other end of the second member are supported, and the axis of the first member bends at a position in the bottomed hole with respect to the axis of the second member while pressing and rotating. compressing the second member by tilting each other by load by repeatedly changing the load in the direction, causing the compressive stress and the shear stress to said one end of said second member, said perforated bottom hole An enlarged fixed portion is formed on the outer peripheral surface of the one end side disposed on the inner side of the first member, and the first member and the second member are formed by pressing the fixed portion only to the inner peripheral surface and the bottom portion of the bottomed hole. A method for manufacturing a composite member, which joins a member. The method for manufacturing a composite member according to claim 1 , wherein at least one of the first member and the second member is made of a brittle material. An annular jig surrounding the outer peripheral surface is arranged on the outer peripheral surface of the first member corresponding to the bottomed hole, and the load is applied by bringing the outer peripheral surface into contact with the inner peripheral surface of the annular jig. The manufacturing method of the composite member of Claim 1 or 2 . The method for manufacturing a composite member according to any one of claims 1 to 3, wherein a taper angle α of the taper shaft portion is within a range where the following expression (1) is satisfied.
(Σ / σc) <(1-2 · (L / D) · tan α) ² (1)
(Where α is the taper angle with respect to the axis of the second member, σ is the stress generated by the original diameter of the second member during processing, σc is the compressive fracture strength of the material of the second member, and L is accommodated in the bottomed hole. The length of the second member, D is the diameter of the original diameter.) A first member having a bottomed hole; and a second member having one end side accommodated in the bottomed hole, an end portion on one end side of the second member abutting against a bottom portion of the bottomed hole, and An apparatus for manufacturing a composite member in which a fixed portion formed by partially enlarging a second member is pressed against an inner peripheral surface of the bottomed hole, and the first member and the second member are joined. Yes,
A first holder that supports the first member; and a second holder that supports the other end of the second member;
A load in the compression direction can be applied between the first holder and the second holder, and the axis of the first member supported by the first holder and the axis of the second member supported by the second holder The apparatus for manufacturing a composite member, wherein the first holder and the second holder are rotatable in a state in which they are inclined. The composite member manufacturing apparatus according to claim 5 , further comprising an annular jig that is disposed on an outer peripheral surface of the first member corresponding to the bottomed hole and has an inner peripheral surface that contacts the outer peripheral surface.

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