JP2008155247A - Friction welding method, and friction welding member joined by using the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction welding method for enhancing resistance properties of a welded part by ensuring resistance against an external force acting on the welded part between components when performing the friction welding of the two components, suppressing thrust force required for performing the friction welding of the components to be low to enable the friction welding by small-scale friction welding equipment, and suppressing the machining cost of the components to be low by eliminating any post-processing for removing burrs. <P>SOLUTION: Friction welding parts 3, 4 of a first component 1 and a second component 2 are formed of annular projecting parts 3a, 4a. Recessed grooves 7A, 7B, 10A, 10B are formed on the inner and outer sides of the projecting parts 3a, 4a. The friction welding parts 3, 4 are subjected to the friction welding before an inner wall 8 and an outer wall 9 on the inner and outer sides of the projecting parts 3a, 4a are brought into contact with the second component 2. Burrs produced by the friction welding are covered by the inner wall 8 and the outer wall 9. Contact parts of the inner wall 8 and the outer wall 9 of the first component 1 with the second component 2 are brought into close contact with each other to an extent that the thrust force against the external force acting on the welded part between the components 1, 2 can be borne. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a friction welding method for joining two constituent members made of the same or different metals such as aluminum, stainless steel, and iron by friction welding, and a friction welding member joined by the method.

  A friction welding method for joining two constituent members to be joined to each other by friction welding has been conventionally used as one joining method for joining two constituent members. In this friction welding method, the friction welding portions of the two component members to be joined are pressed against each other, the component members are relatively rotated, and the friction welding portion is generated by friction heat generated at that time. This is a method of joining while causing plastic flow.

  Thus, when two component members are joined by the friction welding method, the resistance against external force (bending moment, etc.) acting on the joint portion between the two component members joined to each other is not affected by the breaking at the joint portion between the component members. Since it depends on the area, it is necessary to increase the area of the friction welding portion in both constituent members in accordance with the drag required between those constituent members. However, when friction welding parts having a large area are friction-welded, it is necessary to press both constituent members with a thrust of a size corresponding to the area of the friction welding part, so that a large thrust can be generated. It is necessary to perform friction welding with such a large-scale friction welding apparatus, and as a result, there is a problem that the processing cost of the parts becomes high and the price of the parts itself becomes high.

  In addition, the flash generated at the time of friction welding may cause a problem in terms of component function or appearance, but in particular, the volume and form of the part involved in the heat dissipation of the friction welding part in the two components that are friction welding. Etc., the heat dissipation from the friction welding part during friction welding differs between the two components, so the thrust (friction pressure and upset pressure) during friction welding is compared to the area of the friction welding part. In addition to increasing the amount of friction welding between the two components and increasing the amount of flash generated during friction welding, the joint between the two components in the vicinity of the flash It is conceivable that friction heat generated during friction welding is transmitted to the base metal as a heat loss, resulting in a large heat-affected zone, which eventually causes buckling of the joint. Furthermore, if the flash generated at the time of friction welding becomes large, it becomes a problem in terms of part function or appearance, so it is necessary to remove the flash by post-processing such as cutting after friction welding. However, it has been pointed out that the problem is that the components become more expensive.

  The technical problem of the present invention is that when two components to be joined are friction welded, the bending moment acting on the joint between the two components without increasing the area of the friction weld in each component. The resistance against external force of the joint due to friction welding can be improved compared to the case of joining only by friction welding, and at the same time, it is necessary at the time of friction welding of both components By minimizing the thrust as much as possible, friction welding can be performed with a smaller friction welding machine, and it is possible to cover the flash that may cause problems in terms of component function or appearance. Friction welding method that eliminates the need for post-processing for removal and that can keep the machining cost of parts low, and friction welding members joined by the method It is to provide.

  Another technical problem of the present invention is to suppress the thrust during friction welding as low as possible by equalizing the heat dissipation from the friction welding portion during friction welding of both components. At the same time, by reducing the amount of penetration of the friction welds in each component as much as possible and suppressing the amount of flash generated during friction welding, the base material of the joint between both components in the vicinity of the flash The purpose is to suppress as much as possible the generation of the heat affected zone due to the transfer of frictional heat during friction welding.

  The present invention for solving the above-mentioned problems is a friction welding method in which the first component and the second component to be bonded to each other are friction-welded by relative rotation to bond those components. In addition, at least one of the respective friction welding parts in the first and second constituent members is formed by an annular projection facing the other friction welding part, and is concentrically adjacent to at least the outer side of the projection. A concave groove for accommodating a beam generated by friction welding of the projection is provided, and the friction welding portion of the first component member and the second component member is provided in an annular shape provided outside the projection. Friction welding is performed until the outer wall comes into contact with the mating component, and the flash generated by the friction welding of the protrusion is covered by the outer wall, and at the same time, the contact portion between the outer wall and the mating component is Both structures joined together It is characterized in that to close to the extent that may be borne drag against an external force acting on the joint between the members.

In a preferred embodiment of the present invention, each friction welding portion in the first and second constituent members is formed by an annular protrusion, and a groove is accommodated in the inner and outer sides of the protrusion in both constituent members. Is provided.
In another preferred embodiment of the present invention, the protrusions forming the friction welding portions of the first component member and the second component member are formed to have substantially the same volume and substantially the same width and height, respectively. As a result, the heat dissipation from the friction welding portion during friction welding is equalized in both components.
In another preferred embodiment of the present invention, a concave groove is provided on the inner side of the protrusion so as to be concentrically adjacent to receive a beam generated by friction welding of the protrusion. (2) A friction welding portion of the component member is friction-welded until an annular inner wall provided inside the projection comes into contact with the other component member together with the outer wall, and is generated by friction welding of the projection. At the same time that the inner wall and the outer wall are covered, and at the same time, the contact portion between the inner and outer walls and the counterpart component member can bear a resistance against an external force acting on the joint portion between the two component members joined to each other. Close.
In another preferable embodiment of the present invention, the friction welding of the first component member and the second component member by the friction welding method is performed by a friction welding device of a brake method or an inertia method.

  In addition, the friction welding member of the present invention in which the first component member and the second component member to be bonded to each other by the friction welding method are bonded to each of the friction welding portions of the first component member and the second component member. At least one of the protrusions is formed by an annular protrusion facing the other friction welding part, and a flash generated by the friction welding of the protrusion is accommodated concentrically on at least the outer side of the protrusion. The friction welding portion of the first component member and the second component member is friction welded until the outer wall on the outer side of the projection is in contact with the counterpart component member, and is generated by the friction welding. The exposed flash is obscured by the outer wall, and the contact portion between the outer wall and the counterpart component member can bear a resistance against an external force acting on the joint portion between the two component members joined to each other. degree It is characterized by the close proximity.

  According to the present invention described in detail above, it is possible to reduce the area of the friction welding portion in the first component member and the second component member to be joined to each other, and at the same time, suppress the thrust required during the friction welding as much as possible. Therefore, the friction welding can be performed with a smaller-scale friction welding apparatus, and the friction welding portion of the first component member and the second component member is formed in an annular shape provided outside the protrusion. By friction welding until the outer wall comes into contact with the mating component, the contact portion between the outer wall and the mating component bears the resistance against external forces acting on the joint between the two components Therefore, the resistance against the external force of the joint by friction welding can be improved as compared with the case of joining only by friction welding. Moreover, since the flash generated by the friction welding of the protrusion can be covered with the outer wall outside the protrusion, there is no need to perform post-processing for the removal of the flash. The processing cost can be kept low.

  Further, assuming that the protrusions provided on the friction welding parts of the respective constituent members have substantially the same area and height dimensions of the friction welding parts, the protrusions are formed in substantially the same volume, and the friction By equalizing the heat dissipation from the friction welding part during pressure welding in both components, the thrust during friction welding can be suppressed as low as possible, and at the same time, the melting of the friction welding parts in each component By suppressing the amount of flash generated during friction welding by reducing the amount as much as possible, the frictional heat during friction welding is transferred to the base material of the joint between both components in the vicinity of the flash. By doing so, it is possible to suppress the occurrence of the heat affected zone as much as possible.

The best mode for carrying out the friction welding method according to the present invention and the friction welding member joined by the method will be described below in detail with reference to the drawings.
The components to be joined in the present invention are effective to be applied, for example, to joining of a valve body and a flange constituting a fluid pressure device, but two configurations to be joined to each other in various other devices. It can be applied to friction welding between members. Moreover, as a material of both structural members to be joined, the same kind or different kinds of metals such as aluminum alloy, stainless steel, and iron are targeted, and the present invention can be applied to friction welding of these two structural members.

FIG. 1 shows a configuration before friction welding of the first component member 1 and the second component member 2 to be joined to each other by the friction welding method according to the present invention, and FIG. 2 shows a friction welding portion of both component members 1 and 2. The state which made 3 and 4 oppose and contact | abutted is shown.
The first component member 1 is formed in a substantially cylindrical shape as a whole, and has a friction welding part 3 at one end in the axial direction (the lower end side in the drawing). The friction welding portion 3 of the first component 1 is formed by an annular projection 3a that protrudes against the friction welding portion 4 of the second component 2 that is friction-welded to each other. A surface facing the second component 2 in 3a is a friction welding surface 3b. Further, it is concentrically adjacent to the inner and outer sides of the protrusion 3a, and is generated on the inner and outer peripheries of the joint 5 by friction welding between the protrusion 3a and the protrusion 4a of the second component 2 described later. Concave grooves 7A and 7B in which the beams 6 (see FIG. 3) are respectively provided are provided, and the projecting part 3a and the annular projecting wall adjacent to each other via the concave grooves 7A and 7B are both configured. The inner wall 8 and the outer wall 9 are used to cover the flash 6 generated when the members 1 and 2 are friction-welded.

  On the other hand, the second component member 2 is formed in a substantially rectangular parallelepiped shape or a substantially cylindrical shape as a whole, and the friction welding portion 4 is formed on one flat surface (the upper surface in the drawing) of the second component member 2. Yes. The friction welding part 4 of the second component member is formed in substantially the same form as the friction welding part 3 of the first component member 1, and the friction welding part 3 of the first component member 1 is friction welded to each other. The surface of the projection 4a that faces the first component 1 is a friction welding surface 4b. In addition, recessed grooves 10A and 10B are provided, respectively, adjacent to the inner side and the outer side of the protrusion 4a to receive the beams 6 generated by friction welding of the protrusion 4a.

  As described above, the friction welding portions 3 and 4 of the first component member 1 and the second component member 2 are the protrusions 3a and 4a constituting them and the concave grooves 7A and 7B adjacent to the inside and outside thereof. The concave grooves 10A and 10B have the same form, and specifically, are formed with substantially the same width and height and substantially the same volume. The first and second constituent members 1 and 2 are made of the same material. This is because the heat dissipation from the friction welding parts 3 and 4 at the time of friction welding of the two component members 1 and 2 is equalized between the two component members 1 and 2, so The thrust (friction pressure and upset pressure) is suppressed as low as possible, and at the same time, the amount of penetration of the friction welding portions 3 and 4 in the constituent members 1 and 2 is reduced as much as possible to be generated at the time of friction welding. By suppressing the amount of the flash 6, the heat affected zone is generated by transmitting the frictional heat at the time of the friction welding to the base material of the joint portion 5 between the two structural members 1 and 2 in the vicinity of the flash 6. This is to suppress as much as possible.

The diameters and widths of the protrusions 3a and 4a in the friction welding parts 3 and 4 of the two structural members 1 and 2 are determined according to the sizes of the areas of the friction welding surfaces 3b and 4b of the protrusions 3a and 4a. That is, since the strength of the joint portion 5 between the two constituent members 1 and 2 is determined, it is set as appropriate depending on the strength required for the joint portion 5. Further, the height dimensions of the protrusions 3a and 4a in the friction welding portions 3 and 4 suppress the thrust required at the time of friction welding as low as possible and suppress the amount of the flash 6 generated at the time of friction welding. Since it is required, it is desirable to make it as small as possible, but in order to ensure the resistance to the external force of the joint 5, the strength required for the joint 5 of the two component members 1 and 2 joined together. Therefore, it is necessary to set the optimal dimension that can ensure the above.
On the other hand, the width dimension and the depth dimension of the concave grooves 7A and 7B and the concave grooves 10A and 10B of both constituent members 1 and 2 are the width dimension and the height dimension of the protrusions 3a and 4a, that is, the protrusions 3a, In relation to the volume of 4a, the amount is appropriately set in consideration of the amount of the flash 6 generated during the friction welding.

  When the first component member 1 and the second component member 2 having the above-described configuration are friction-welded, as shown in FIG. 2, the friction-weld portions 3 and 4 of both the component members 1 and 2 are connected to the protrusions 3a. , 4a are rotated relative to each other while the friction welding surfaces 3b, 4b are in contact with each other, and the protrusions 3a, 4a are plastically flowed by the frictional heat generated at that time, whereby the first component 1 Friction welding is continued until the surfaces of the annular inner wall 8 and the outer wall 9 facing the second component 2 are in contact with the second component 2, and the above-mentioned friction welding portion is interposed between the two components 1, 2. A joint 5 is formed in which the three and four protrusions 3a and 4a are joined to each other (see FIG. 3). By joining the two constituent members 1 and 2 in this way, the contact portion between the inner side wall 8 and the outer side wall 9 of the first constituent member 1 and the second constituent member 2 is placed between the two constituent members 1 and 2. The flash 6 generated by the friction welding of the projections 3a and 4a can be applied to the inner wall 8 and the outer wall. 9 can cover the concave grooves 7A, 7B, 10A and 10B.

  According to the friction welding method having the above-described configuration and the friction welding member joined by the method, the inner wall 8 and the outer wall 9 of the first component 1 and the second component 2 are in close contact with each other, and a resistance against an external force is borne. Therefore, the areas of the friction welding surfaces 3b and 4b of the protrusions 3a and 4a in the friction welding portions 3 and 4 of the first component member 1 and the second component member 2 to be joined to each other can be reduced. At the same time, the thrust required at the time of friction welding can be suppressed as much as possible, whereby friction welding can be performed with a small-scale friction welding apparatus. In other words, the friction welding portions 3 and 4 of the first component member 1 and the second component member 2 face the second component member 2 on the inner and outer inner walls 8 and 9 of the protrusion 3a. The contact portion between the annular inner wall 8 and the outer wall 9 of the first component 1 and the second component 2 is obtained by a simple means that the surface is friction-welded until the surface comes into contact with the second component 2. When the two members 1 and 2 are brought into close contact with each other so as to be able to bear the resistance against the external force acting on the joint portion 5, and thereby the resistance against the external force of the joint portion 5 due to the friction welding is joined only by the friction welding. Compared to, it can be improved dramatically. In addition, the flash 6 generated by the friction welding of the protrusions 3a and 4a can be covered in the concave grooves 7A and 7B and the concave grooves 10A and 10B by the inner side wall 8 and the outer side wall 9. It is not necessary to remove the flash 6 which causes a problem in terms of function and appearance by post-processing such as cutting, and it is possible to simplify the processing process of the component and keep the processing cost of the component low.

  Further, assuming that the protrusions 3a and 4a of the friction welding parts 3 and 4 of the constituent members 1 and 2 have substantially the same width and height, respectively, the protrusions 3a and 4a are made to have substantially the same volume. And the heat dissipation from the friction welding parts 3 and 4 at the time of friction welding is equalized in both the constituent members 1 and 2, so that the thrust at the time of friction welding can be suppressed as low as possible. At the same time, by reducing the amount of penetration of the protrusions 3a and 4a of the friction welding parts 3 and 4 in the constituent members 1 and 2 as much as possible, and suppressing the amount of the flash 6 generated during the friction welding, In the vicinity of the beam 6, the heat affected zone is prevented from being generated as much as possible by transmitting frictional heat during friction welding to the base material of the joint 5 between the two structural members 1 and 2, and When the external force acts on the joint 5 between the constituent members 1 and 2, the contact It is possible to suppress the occurrence of damage such as buckling as possible in section 5.

  The inner wall 8 and the outer wall 9 on the inner and outer sides of the protrusion 3a are stopped at a position where the surface facing the second component 2 is in contact with the second component 2 and not joined by friction welding. Although it is desirable to prevent the thrust at the time of friction welding from increasing and to prevent the generation of flash on the outer periphery of the inner peripheral wall 8 and / or the outer wall 9, both the structural members 1, When the flash generated on the outer periphery of the inner peripheral wall 8 and / or the outer wall 9 does not become a problem in terms of component function or appearance due to the shape and function of the friction welding member formed by the friction welding of No. 2, the inner wall 8 And / or a slight flash may be formed on the outer periphery of the outer wall 9.

Here, the configuration of the protrusions 3a and 4a and the concave grooves of the friction welding portions 3 and 4 in the first component member and the second component member 2 to be joined to each other is not limited to that of the above-described embodiment. For example, it can also be set as a form like the Example shown to Fig.4 (a)-FIG.4 (c).
That is, in the embodiment shown in FIG. 4A, the configurations of the friction welding portion 3, the concave grooves 7A and 7B, the inner side wall 8, and the outer side wall 9 in the first component 1 are the same as those in the above-described embodiment. On the other hand, the friction welding portion 4 of the second component member 2 is formed with concave grooves 10A and 10B on the inner and outer sides of the friction welding surface 4b facing the friction welding surface 3b of the first component member 1, respectively. Thus, an annular protrusion 4a is formed between the concave grooves 10A and 10B.
Further, in the embodiment shown in FIG. 4B, an annular protrusion 3 a is formed that protrudes from the friction welding portion 3 of the first component 1 while facing the friction welding portion 4 of the second component 2. On the other hand, the configuration of the friction welding part 4 and the concave grooves 10A and 10B in the second component 2 is the same as that of the second component 2 in the embodiment of FIG. Yes. In this case, the flash 6 generated by the friction welding of the projections 3a and 4a of the two constituent members 1 and 2 is the outer side of the inner side wall 11 of the inner concave groove 10A and the outer concave groove 10B in the second constituent member 2. It will be obscured by the wall 12. Note that an inner wall 8 and an outer wall 9 are formed on the inner and outer sides of the protrusion 3 a in the first component 1, although they do not protrude toward the second component 2.
Further, in the embodiment shown in FIG. 4 (c), the configurations of the friction welding portion 3, the concave grooves 7A and 7B and the inner and outer walls 8 and 9 of the first component 1 are the same as those in the embodiment of FIG. On the other hand, the friction welding portion 4 of the second component 2 is configured as a flat friction welding surface 4b that is not processed at all. In this case, since it is not necessary to perform processing for friction welding on the second component member 2, it is possible to simplify the part processing step and further reduce the processing cost of the part.

In each of the embodiments shown in FIGS. 4 (a) to 4 (c), the friction welding portions of the first component member 1 and the second component member 2 are the same as the embodiment of FIG. 1 described above. 3 and 4 are formed with annular protrusions 3a and / or 4a, and recessed grooves 7A, 7B in which the flash 6 is accommodated adjacent to the inner and outer sides of the protrusions 3a and / or 4a, and Although 10A and 10B are provided, as shown in FIGS. 5 (a) to 5 (d), a second cylindrical member 22 is formed on the second component member 22 by friction welding. In the case where the hole portion 22a communicating with the hole portion 21a in the one component member 21 is formed, the flash formed inside the protrusion 23a and / or 24a in the friction welding portion 23, 24 is a problem in terms of component function If not, the protrusion 23a and / or It may be a structure without the groove on the inner side of the adjacent position of 24a.
That is, in the embodiment shown in FIG. 5A, the friction welding portion 23 of the first component member 21 is friction-welded to each other at the inner peripheral edge of the hole 21a in the first component member 21. It is formed by an annular protrusion 23a that protrudes opposite to the friction welding part 24 of the member 22, and a concave groove 27 is provided adjacent to the outer side of the protrusion 23a, and an outer wall 29 is provided on the outer side thereof. On the other hand, the friction welding portion 24 of the second component member 22 has the same configuration as that of the friction welding portion 23 of the first component member 21, and the first component is friction-welded to each other. It is formed by forming an annular protrusion 24a that protrudes in opposition to the friction welding part 23 of the component member 21, and by providing a concave groove 30 adjacent to the outside of the protrusion 24a.

Further, in the embodiment shown in FIG. 5B, the configurations of the friction welding portion 23 and the concave groove 27 in the first component member 21 are the same as those in the above-described embodiment of FIG. By forming the concave groove 30 on the outer side of the friction welding surface 24b of the second component member 22 where the friction welding portion 24 of the second component member 22 faces the friction welding surface 23b of the first component member 21. An annular protrusion 24 a that faces the hole 22 a of the second component 22 is formed inside the concave groove 30.
Further, in the embodiment shown in FIG. 5C, the second configuration in which the friction welding portion 23 of the first component member 21 is friction-welded with each other at the inner peripheral edge of the hole 21 a in the first component member 21. It is configured by forming an annular protrusion 23a that protrudes opposite to the friction welding part 24 of the member 22, while the friction welding part 24 and the concave groove 30 of the second component member 22 are formed as shown in FIG. (B) It is set as the structure similar to the 2nd structural member 22 in the Example. In this case, the flash generated by the friction welding of the protrusions 23 a and 24 a of the two component members 21 and 22 is covered by the outer wall 39 of the concave groove 30 in the second component member 22.
Further, in the embodiment shown in FIG. 5D, the configurations of the friction welding portion 23 and the concave groove 27 in the first component member 21 are the same as those of the first component member 21 in the embodiment of FIG. On the other hand, the friction welding portion 4 of the second component member 22 is configured as a flat friction welding surface 24b that is not subjected to any processing. In this case, as in the embodiment shown in FIG. 4 (c) described above, it is not necessary to process the second component member 22 for friction welding, so that the part processing process can be simplified. The processing cost can be further reduced.

  In each of the embodiments shown in FIGS. 5 (a) to 5 (d), the flash generated by the friction welding of the protrusions 23a and 24a in the friction welding parts 23 and 24 of the two component members 21 and 22 is Inside the protrusions 23a and 24a, they are obscured in the holes 21a and 22a of the two component members 21 and 22, and outside the protrusions 23a and 24a, the outer wall 29 or the second structure of the first component member 21 is covered. It is covered by the outer wall 39 of the member 22. In addition, since the contact portion between the outer side walls 29 and 39 and the counterpart component member is brought into close contact with the external force acting on the joint portion between the two component members 21 and 22 joined to each other, Compared to the case of joining only by friction welding, it is possible to improve the resistance to the external force of the joint portions of both constituent members 21 and 22.

In general, friction welding means that, as described above, two structural members to be joined to each other are brought into contact with each other, and frictional heat is generated by a relative motion generated on the contact surface while being pressurized, and is joined by the energy. A typical joining method is rotational friction welding. The rotary friction welding device used in the present invention includes a continuous drive friction welding device (brake method or braking method) and an accumulator friction welding device (inertia method or flywheel method). The latter is a method in which the number of revolutions, time, and control are controlled, and the latter is a method in which joining is completed when a predetermined frictional force is applied by the initial number of revolutions and friction pressure.
In the embodiment described below, a brake-type electric servo friction welding device that generates thrust using a servo motor and a ball screw shaft is used, but by using this electric servo friction welding device, It is possible to stop the outer wall (inner wall) on the outer side (inner side) of the protrusion constituting the friction welding portion and the mating component member in close contact with each other without friction welding.

Hereinafter, the friction welding method according to the present invention and examples of the method will be described. However, the present invention should not be construed as being limited to the examples.
In the examples described below, two constituent members made of a 6000 series aluminum alloy (aluminum-magnesium-silicon (Al-Mg-Si) series alloy) were used. Also, as the friction welding device, a brake type electric servo friction welding device that generates thrust using a servo motor and a ball screw shaft was used. By using this electric servo friction welding device, the outer wall (inner wall) on the outer side (inner side) of the projecting part constituting the friction welding part and the mating component member are stopped in close contact without friction welding. It becomes possible to make it.
The shapes of the constituent members that are friction-welded with each other are the same as the shapes of the constituent members described in the embodiment of FIG. 1 described above.
Below, the pressure welding conditions at the time of the friction welding in a present Example are shown.
・ Spindle speed (N): 2000 / min
Friction pressure (P1 pressure): 33 MPa
Upset pressure (P2 pressure): 165 MPa

  What is important in the pressure contact condition is the timing of applying the P2 pressure. When the timing of applying the P2 pressure is early (the friction welding surfaces of the two component members do not generate sufficient frictional heat at the P1 pressure), the inner portion and / or the outer side of the friction welding portion of the first component member is not pushed by the P2 pressure. A gap is formed between the inner wall and / or the outer wall of the second member and the second component member. On the other hand, if the timing of applying the P2 pressure is late (the friction welding surfaces of both constituent members are overheated by the P1 pressure), the inner wall and / or the outer wall of the first constituent member are Two components contact and a crack arises in the joined part of those friction welding parts.

Considering the above points, pressurize with P1 pressure to generate sufficient heat at the friction welding parts of both components, and suddenly stop the rotation of the spindle by applying a brake in the optimal heating state that matches the characteristics of each component Further, pressurization was performed at a P2 pressure higher than the P1 pressure, and friction welding was performed until the annular inner wall and outer wall of the first component member were in contact with the second component member. As a result, the protrusions at the friction welding portions of the respective constituent members uniformly bulge into the inner and outer concave grooves, and a beam was generated, and a good joined state was obtained.
In the friction welding member joined as described above, the contact portions between the annular outer wall and the inner wall of the first component and the second component are in close contact with each other, so that the inner and outer walls serve as a beam. It is possible to bear the resistance against the external force (bending moment) acting on the joint part of both components joined to each other, so that the resistance against the external force of the joint part compared to the case of joining only by friction welding Has improved dramatically.

  Here, the friction welding method according to the present invention can be performed not only in the brake type (continuous drive type) friction welding apparatus used in the above-described embodiment but also in the inertia type (accumulation type) friction welding apparatus. It can be done.

It is a sectional side view before the friction welding of the 1st component member and the 2nd component member joined by the friction welding method which concerns on this invention. It is a principal part expanded sectional view of the friction welding part before the same friction welding. It is a principal part expanded sectional view of the friction welding part after the friction welding. It is side sectional drawing before the friction welding which shows another Example of the 1st structural member joined by the friction welding method which concerns on this invention, and a 2nd structural member. It is side sectional drawing before the friction welding which shows the other Example. It is side sectional drawing before the friction welding which shows the other Example. It is a sectional side view before the friction welding which shows another Example of the 1st component member and the 2nd component member joined by the friction welding method which concerns on this invention. It is side sectional drawing before the friction welding which shows the other Example. It is side sectional drawing before the friction welding which shows the other Example. It is side sectional drawing before the friction welding which shows the other Example.

Explanation of symbols

1, 21 1st component 2, 22 22 2nd component 3, 4, 23, 24 Friction weld 3a, 4a, 23a, 24a Projection 5 Joint 6 Beam 7A, 7B, 10A, 10B, 27, 30 Concave Grooves 8, 18 Inner side wall 9, 19, 29, 39 Outer side wall

Claims (6)

A friction welding method for joining these constituent members by friction welding the first constituent member and the second constituent member to be joined to each other by relative rotation,
At least one of the respective friction welding parts in the first and second constituent members is formed by an annular projection facing the other friction welding part, and is concentrically adjacent to at least the outer side of the projection. And providing a concave groove in which a beam generated by friction welding of the protrusion is accommodated,
Friction welds of the first component and the second component are generated by friction welding until an annular outer wall provided on the outer side of the projection is in contact with the other component, and generated by friction welding of the projection. At the same time that the burrs are covered by the outer wall, the contact portion between the outer wall and the counterpart component member can bear a resistance against an external force acting on the joint portion between the two component members joined to each other. Close
Friction welding method characterized by that. While forming each friction welding part in the 1st and 2nd component members with a ring-shaped projection, provided the ditch | groove in which a flash is accommodated in the inside and outside of the projection in both components,
The friction welding method according to claim 1. By forming the protrusions forming the friction welding portions of the first component member and the second component member into substantially the same volume with substantially the same width and height dimensions, heat from the friction welding portion at the time of friction welding is formed. Equalizing the dissipation of both components
The friction welding method according to claim 1 or 2, wherein the friction welding method is provided. A concave groove is provided on the inner side of the protrusion so as to be concentrically adjacent to receive a beam generated by friction welding of the protrusion.
The friction welding portion of the first component member and the second component member is friction-welded until the annular inner wall provided inside the protrusion comes into contact with the other component member together with the outer wall. The flash generated by the friction welding is covered by the inner wall and the outer wall, and at the same time, the contact portion between the inner and outer walls and the counterpart component member is against the external force acting on the joint portion between the two component members joined to each other. Close enough to be able to bear the drag,
The friction welding method according to any one of claims 1 to 3. Friction welding of the first component member and the second component member by the friction welding method is performed by a friction welding device of a brake method or an inertia method.
The friction welding method according to any one of claims 1 to 4, wherein: A friction welding member obtained by joining the first component member and the second component member to be joined to each other by the friction welding method according to claim 1,
At least one of the respective friction welding parts in the first and second constituent members is formed by an annular projection facing the other friction welding part, and is concentrically adjacent to at least the outer side of the projection. Having a concave groove in which a beam generated by friction welding of the protruding portion is accommodated,
The friction welding portions of the first component member and the second component member are friction-welded until the outer wall on the outer side of the protrusion comes into contact with the other component member, and the flash generated by the friction welding is the outer wall. And the contact portion between the outer wall and the counterpart component is close enough to bear a resistance against an external force acting on the joint between the two components joined together.
A friction welding member characterized by that.

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