JP2014163472A - Manufacturing method of slide member and slide member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a slide member capable of preventing a slide member from being slipped off, and provide the slide member.SOLUTION: A manufacturing method of a bearing 40 comprises: an inside member formation step of forming a bush 20 to be a cylindrical inside member; an outside member formation step of forming a collar 30 to be a cylindrical outside member on the outer peripheral surface of the bush 20 by rolling the bush 20 with a plate-like member 17 (a bending member 17C) and connecting both side end parts of the plate-like member 17 (the bending member 17C); and interface indent formation step of forming interface indents 10b to be many ring-like recesses on an outer peripheral surface to be a surface on a side on which the bush 20 is connected to the collar 30, before the outside member formation step.

Description

  The present invention relates to a sliding member manufacturing method and a sliding member technique, and more particularly to a technique for manufacturing a sliding member having excellent workability.

  Conventionally, in various machines such as construction machines and automobiles, a sliding member such as a slide bearing formed in a cylindrical shape is used in order to make a shaft inserted into a housing rotatable, and a technique related to this is also disclosed. (For example, see Patent Document 1 and Patent Document 2).

Japanese Patent Application Laid-Open No. 11-201166 JP 2007-333185 A

  According to the techniques described in Patent Document 1 and Patent Document 2, the cylindrical sliding member is press-fitted into the other party and assembled. According to the above configuration, the sliding member from the press-fitting destination The stopper was not enough.

  In view of the above situation, the present invention provides a method for manufacturing a sliding member and a sliding member that can prevent the sliding member from coming off.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the inner member forming step of forming a cylindrical inner member, the inner member is wound with a plate-like member, and both end portions of the plate-like member are joined, thereby the inner member. An outer member forming step of forming a cylindrical outer member on the outer peripheral surface of the inner member, and before the outer member forming step, at least of the inner member and the plate member serving as the outer member On the other hand, there is provided an interface indent forming step of forming interface indents, which are a number of depressions, on the surface on the side where the inner member and the outer member are in contact with each other.

  According to a second aspect of the present invention, the inner member includes a back metal that is an outer peripheral portion and a lining that is an inner peripheral portion, and a plurality of depressions are formed on the inner peripheral surface of the lining before the outer member forming step. An inner peripheral surface indent forming step of forming the peripheral surface indent is provided.

  In claim 3, in the interface indent formation step, the interface indent is formed on the outer peripheral surface of the inner member, and the interface indent formation step and the inner peripheral surface indent formation step are performed simultaneously, thereby The interface indent and the inner peripheral surface indent are simultaneously formed on both surfaces of the member.

  According to a fourth aspect of the present invention, in the interface indent forming step, the interface indent is formed on the outer peripheral surface of the inner member, and the hardness of the outer member is smaller than the hardness of the inner member.

  According to a fifth aspect of the present invention, the interface indent is formed in a ring shape in the interface indent formation step.

  In Claim 6, it manufactures with the manufacturing method of the sliding member of any one of Claims 1-5.

  As effects of the present invention, the following effects can be obtained.

  According to the sliding member manufacturing method and the sliding member according to the present invention, it is possible to prevent the sliding member from coming off.

The perspective view which showed the sliding member which concerns on this embodiment. The figure which showed the flow in the manufacturing method of the sliding member which concerns on this embodiment. The figure which showed each process which concerns on manufacture of a bush. The figure which showed each process which concerns on manufacture of a sliding member.

First, the manufacturing method of the bearing 40 (refer FIG.1 and FIG.4) which is a sliding member which concerns on 1st embodiment is demonstrated.
The bearing 40, which is a sliding member according to the present embodiment, is a slide bearing that is used to allow a shaft inserted into a housing (not shown) to rotate, and is used by being press-fitted into the housing.

  As shown in FIGS. 1, 2 and 4, the bearing 40 is manufactured by forming a collar 30 which is a cylindrical outer member on the outer peripheral surface of a bush 20 which is a cylindrical inner member. As shown in FIG. 2, the bush 20 according to the present embodiment is mainly formed by each process of rough bending (step S11), butt forming (step S12), and heat treatment (step S13). On the other hand, the collar 30 mainly inserts the bushing 20 (step S31) and entrains (step S32) after the plate-like member 17 is subjected to each process of clinching (step S21) and rough bending (step S22). Then, an oil impregnation process (step S33) is performed, and the bearing 40 is completed at the same time.

  The method for forming the bush 20 according to the present embodiment will be further described with reference to FIG. As shown in FIG. 3 in detail, the bushing 20 is formed by spraying powder (step S01), sintering / rolling (step S02), indentation (step S03), rough bending (step S11), butt molding (step). Each step of S12) is provided. Hereinafter, each process is demonstrated concretely.

  In the powder spraying step (step S01) shown in FIG. 3, first, a back metal 15 that is a plate-like metal member is prepared. For example, an iron-based member is used as the material of the back metal 15. Next, metal powder in which iron powder and copper powder are mainly mixed substantially uniformly is sprayed on the surface 15a of the back metal 15 using a spraying device to form the sprayed layer 11b. Thus, the spreading layer 11b is formed substantially uniformly on the surface of the plate-like back metal 15, and the plate-like pre-sintering member 9 is configured.

  Next, in the sintering / rolling step (step S02) shown in FIG. 3, the pre-sintering member 9 constructed in the powder spraying step (step S01) is put into a sintering furnace and heated with a heater, and the main layer in the spraying layer 11b The sprayed layer 11b is sintered in an atmosphere at a temperature (for example, 800 to 1300 degrees) lower than the melting point of the component iron powder. As a result, the spreading layer 11 b becomes a porous sintered layer 11, and the pre-sintering member 9 becomes a sintered alloy 10 which is an inner plate-like member made of a bimetal of the back metal 15 and the sintered layer 11. As will be described later, the sintered alloy 10 is formed as a lining in which the back metal 15 is an outer peripheral portion of the bush 20 and the sintered layer 11 is an inner peripheral portion of the bush 20.

  In the present embodiment, the sintering process is repeated a plurality of times, and at the same time, by performing a rolling process in which the sintered alloy 10 is rolled with a roller during the sintering process, the plate thickness of the sintered alloy 10 is reduced. . Further, in the present embodiment, the sintered alloy 10 is formed by the continuous sintering method, but it is also possible to adopt a configuration in which it is formed by another method such as a single body sintering method.

  Next, in the indent formation process (step S03) shown in FIG. 3, the sintered alloy 10 is pressed by a press machine (not shown). As a result, the inner surface indent 10a, which is a large number of hemispherical depressions, is formed on the surface of the sintered alloy 10 on the side of the sintered layer 11 (the inner surface of the lining of the bush 20) (inner surface indent formation). Process). At the same time, the interface indent 10b, which is a large number of ring-shaped depressions, is formed on the surface of the back metal 15 in the sintered alloy 10 (the outer peripheral surface of the bush 20) (interface indent forming step). The inner peripheral surface indent 10a in the present embodiment is formed as a large number of hemispherical depressions, but it is also possible to adopt a configuration in which grooves are processed instead of the inner peripheral surface indent 10a. Further, the interface indent 10b may be a line or a circle that is not a ring.

  Next, in the rough bending process (step S11) shown in FIGS. 2 and 3, the sintered layer 11 is formed of the sintered alloy 10 in which the inner peripheral surface indent 10a and the interface indent 10b are formed in the indent forming process (step S03). Bending is performed by winding with a bending machine (not shown) so as to be inside, and a bending member 10C having a semi-cylindrical central portion is formed. The inner surface of the bending member 10 </ b> C formed by this rough bending process (the surface on which the inner peripheral surface indent 10 a is formed) becomes the inner peripheral surface of the lining in the bush 20.

  Next, in the butt-forming process (step S12) shown in FIGS. 2 and 3, the central portion (semi-cylindrical portion) of the bending member 10C is set on the side of the upper die 51s which is a semi-cylindrical fixed die. . Then, the lower mold 51m, which is also a semi-cylindrical movable mold, is brought close to the end of the bending member 10C as indicated by an arrow U1 shown in FIG. Thus, as shown in FIG. 3, both end portions of the bending member 10C, which is an inner plate-like member, are abutted by being deformed along the semi-cylindrical surface of the lower die 51m, thereby forming the bush 20 which is an inner member. It is. At this stage, there may be a slight gap at the butted portion of the bush 20. That is, the bush 20 only needs to be formed in a substantially cylindrical shape, and the butt portion does not need to be completely joined.

  Next, in the heat treatment step (step S13) shown in FIG. 2, the bush 20 is cured by performing heat treatment such as quenching and tempering on the bush 20. By this treatment, the hardness of each of the backing metal 15 and the sintered layer 11 is improved (for example, the backing metal 15 has a Vickers hardness of 100 to 400, the sintered layer 11 has a Vickers hardness of 300 to 800), and the strength of the bush 20 is improved. .

  Next, the method for forming the collar 30 according to the present embodiment will be further described with reference to FIG. In detail, as shown in FIG. 4, the collar 30 is subjected to clinching cutting (step S21) and rough bending (step S22) on the plate-like member 17, and then the bush 20 is inserted (step S31). It is formed by each step of (Step S32). Hereinafter, each process is demonstrated concretely.

  In the clinching cutting step (step S21) shown in FIG. 2 and FIG. 4, the long plate member 16 which is a steel plate is punched with a clinching die 61 as shown by an arrow P in FIG. In this embodiment, the hardness of the long plate member 16 is smaller than the hardness of the bush 20 that is the inner member. Both end portions of the plate-like member 17 are formed in a clinch shape that can be engaged with each other. Specifically, an engagement convex portion 17a that is an engagement portion is formed in a substantially circular shape at one end portion (right end portion in FIG. 4) of the plate-like member 17, and the other end portion of the plate-like member 17 (FIG. 4). An engagement recess 17b, which is an engaged portion, is formed in a substantially circular shape on the same level as the engagement projection 17a. That is, as shown in FIG. 4, the long plate member 16 is punched in order with the clinch mold 61 in which the shapes of the engaging convex portion 17 a and the engaging concave portion 17 b are formed, whereby the plate-like member 17 having a clinch shape at both ends. Is formed.

  Next, in the rough bending process (step S22) shown in FIGS. 2 and 4, the plate-like member 17 formed in the clinching cutting process (step S21) is wound by a bending machine or the like (not shown) to perform the bending process. Forms a semi-cylindrical bending member 17C. At this time, the curvature radius of the inner peripheral surface of the bending member 17 </ b> C is formed to be substantially the same as or slightly larger than the curvature radius of the outer peripheral surface of the bush 20. The outer surface of the bending member 17 </ b> C formed by this rough bending process becomes the outer peripheral surface of the collar 30, that is, the outer peripheral surface of the bearing 40.

  Next, as shown in FIG. 2, the bush 20 as the inner member is inserted inside the bending member 17C (step S31). 2 and 4, in the winding forming step (step S32), the central portion (semi-cylindrical portion) of the bending member 17C and the bush 20 are placed on the upper die 52s side which is a semi-cylindrical fixed die. set. Then, the lower mold 52m, which is also a semi-cylindrical movable mold, is brought close to the end of the bending member 17C as indicated by an arrow U2 shown in FIG. Thus, as shown in FIG. 4, the clinch shape is engaged so that the bush 20 is wound by deforming both side ends of the bending member 17C, which is a plate-like member, along the semi-cylindrical surface of the lower mold 52m. . Specifically, both end portions of the bending member 17C, which is a plate-like member, are joined by causing the engaging convex portion 17a to enter and engage with the engaging concave portion 17b. In this way, the bearing 40 having the outer peripheral surface of the collar 30 as the outer member is formed. At this time, as shown in a region α in FIG. 4, the inner surface of the collar 30 flows into the interface indent 10 b formed on the outer peripheral surface of the bush 20, so that a part of the collar 30 penetrates into the bush 20.

  Next, in the oil impregnation process shown in FIG. 2 (step S33), the bearing 40 is impregnated with an oil component made of high viscosity lubricating oil using an oil impregnation machine. In the oil impregnation step, the high-viscosity lubricating oil is heated to lower the viscosity, and the bearing 40 is immersed in the lubricating oil and left in a vacuum atmosphere. As a result, the air in the pores of the bearing 40 is sucked out of the pores, while the low-viscosity lubricating oil is sucked into the pores of the bearing 40. When the bearing 40 that has sucked the lubricating oil is allowed to cool to room temperature, the lubricating oil whose viscosity has been reduced returns to the original high-viscosity lubricating oil in the pores of the bearing 40 and loses fluidity. As a result, the high-viscosity lubricating oil can be retained in the pores of the bearing 40.

  As described above, in the method of manufacturing the bearing 40 that is the sliding member according to the present embodiment, the inner member forming step of forming the bush 20 that is the cylindrical inner member, and the plate member 17 (bending member 17C). Then, the bush 20 is rolled in, and both end portions of the plate-like member 17 (bending member 17C) are brought into contact with each other (specifically, the engaging convex portion 17a and the engaging concave portion 17b are removed from both end surfaces of the bending member 17C. An outer member forming step of forming a collar 30 which is a cylindrical outer member on the outer peripheral surface of the bush 20 by joining the surfaces in contact with each other. In addition, before the outer member forming step, an interface indent forming step of forming a large number of ring-shaped indentations 10b on the outer peripheral surface which is a surface on the side where the bush 20 contacts the collar 30 is provided.

  By configuring as described above, when the outer member (collar 30) is wound around the inner member (bush 20) during the manufacture of the bearing 40, the inner surface of the collar 30 is formed on the outer peripheral surface of the bush 20. It is possible to cause the interface 30 to flow into the interface indent 10 b and to insert a part of the collar 30 into the interface indent 10 b of the bush 20. In other words, since the surface of the collar 30 is not easily indented by the interface indent 10b, the bush 20 can be removed from the collar 30 in the bearing 40 even if a force that causes relative displacement in the axial direction is applied between the bush 20 and the collar 30. Can be prevented. Thus, since the interface indent 10b needs to bite the inner surface of the collar 30, the shape such as the width and the depth is formed so that the material constituting the collar 30 can flow. .

  In the present embodiment, the interface indent 10 b is formed on the outer peripheral surface of the bush 20. However, the bush 20 is not easily inserted into the collar 30 by forming the interface indent on the inner peripheral surface of the collar 30. A configuration is also possible. Furthermore, an interface indent may be formed on both the outer peripheral surface of the bush and the inner peripheral surface of the collar. In that case, both interface indents may or may not overlap. That is, at least one of the bush 20 that is the inner member and the plate-like member 17 that is the collar 30 that is the outer member, the surface on the side where the bush 20 and the collar 30 are in contact with each other (the outer peripheral surface of the bush 20 or the collar The inner peripheral surface 30) may be configured to form an interface indent.

  In the present embodiment, the bush 20 includes a backing metal 15 that is an outer peripheral portion and a sintered layer 11 that is a lining of the inner peripheral portion. And before the formation process of the color | collar 30, the internal peripheral surface indent formation process which forms the internal peripheral surface indent 10a which is many dents in the internal peripheral surface of lining (sintered layer 11) is provided. Thereby, when using the bearing 40, lubricating oil can be hold | maintained with the internal peripheral surface indent 10a formed in the internal peripheral surface, and slidability can be improved.

  Moreover, in this embodiment, it is set as the structure which performs an interface indent formation process and an internal peripheral surface indent formation process simultaneously in an indent formation process (step S03). That is, the interface indent 10b and the inner peripheral surface indent 10a are simultaneously formed on both surfaces of the sintered alloy 10 forming the bush 20. As a result, when forming indents in the sintered alloy 10, the interface indent 10 b and the inner peripheral surface indent 10 a can be formed by simultaneously pressing both sides, so that in comparison with the configuration in which the indent is formed on each side. Thus, the number of processes can be reduced.

  Moreover, in this embodiment, in the formation process of the bush 20 which is an inner member, the bush 20 is formed by abutting the both end portions of the bending member 10C which is an inner plate member. Thereby, the freedom degree of shaping | molding of the bush 20 can be enlarged. The bush 20 can also be formed by cutting a pipe material or a solid material.

  Further, in the present embodiment, the interface indent 10b is formed on the outer peripheral surface of the bush 20 and at the same time, the hardness of the collar 30 as the outer member is smaller than the hardness of the bush 20 as the inner member. As a result, the hardness of the outer member on the winding side is reduced, so that the moldability is improved when the collar 30 is formed, and at the same time, the collar 30 easily flows to the interface indent 10b. In other words, the inner surface of the collar 30 is easily inserted into the interface indent 10b, and the bush 20 is more effectively prevented from coming off the collar 30 in the bearing 40.

  In the present embodiment, the interface indent 10b is formed in a ring shape. As a result, when the surface of the collar 30 is hard to be indented by the interface indent 10b, it is possible to efficiently ensure the total length of the edges where the collar 30 and the interface indent 10b are engaged. In other words, the resistance force opposite to the axial displacement force between the bush 20 and the collar 30 is increased to more effectively prevent the bush 20 from coming off the collar 30 in the bearing 40. It is.

  In the present embodiment, on both surfaces of the sintered alloy 10, the interface indent 10b and the inner peripheral surface indent 10a are formed at the same position (position facing each other on the back side). Thereby, the crack by the formation of the inner peripheral surface indent 10a is hardly caused by the interface indent 10b. In addition, the interface indent 10b is made difficult to break by suppressing the flow of the ductile back metal 15 in forming the inner peripheral surface indent 10a.

DESCRIPTION OF SYMBOLS 10 Sintered alloy 10a Inner surface indent 10b Interface indent 11 Sintered layer 15 Back metal 17 Plate-like member 17C Bending member 20 Bush 30 Color 40 Bearing

Claims (6)

Forming a cylindrical inner member, an inner member forming step;
An outer member forming step of forming a cylindrical outer member on an outer peripheral surface of the inner member by winding the inner member with a plate member and joining both end portions of the plate member;
Prior to the outer member forming step, a number of depressions are formed on the surface of the inner member and the plate-like member serving as the outer member on the side where the inner member and the outer member are in contact with each other. Forming an interface indentation, comprising an interface indentation step,
The manufacturing method of the sliding member characterized by the above-mentioned. The inner member includes a back metal that is an outer peripheral part and a lining that is an inner peripheral part,
Before the outer member forming step, an inner peripheral surface indent forming step of forming an inner peripheral surface indent which is a large number of depressions on the inner peripheral surface of the lining is provided.
The manufacturing method of the sliding member of Claim 1 characterized by the above-mentioned. In the interface indent formation step, the interface indent is formed on the outer peripheral surface of the inner member,
By simultaneously performing the interface indentation step and the inner peripheral surface indentation step,
Forming both the interface indent and the inner peripheral surface indent simultaneously on both sides of the inner member;
The manufacturing method of the sliding member of Claim 2 characterized by the above-mentioned. In the interface indent formation step, the interface indent is formed on the outer peripheral surface of the inner member,
The hardness of the outer member is smaller than the hardness of the inner member,
The manufacturing method of the sliding member according to any one of claims 1 to 3, wherein In the interface indent formation step, the interface indent is formed in a ring shape,
The method for manufacturing a sliding member according to any one of claims 1 to 4, wherein the sliding member is manufactured as described above. It manufactured with the manufacturing method of the sliding member according to any one of claims 1 to 5.
A sliding member characterized by that.

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