JP6124620B2 - Manufacturing method of sliding member - Google Patents

Description

  The present invention relates to a technique for manufacturing a sliding member, 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 has been used in order to enable rotation of a shaft inserted into a housing, and a technique related thereto is also disclosed (for example, (See Patent Document 1).

JP 2007-333185 A

  According to the technique described in Patent Document 1, a cylindrical sintered material (inner) is press-fitted into an inner peripheral portion of a cylindrical back metal (outer) to constitute a sliding member. According to such a configuration, since it is necessary to manage the tightening margin between the cylindrical outer and inner with high accuracy, it has been a factor that increases the time and cost for manufacturing the sliding member.

  In view of the above situation, the present invention eliminates the need to manage the tightening allowance between the cylindrical outer and inner with high accuracy, and thus suppresses the time and cost required for manufacturing the sliding member. Provided is a method for manufacturing a sliding member.

  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, it is a manufacturing method of the sliding member provided with a cylindrical inner member and the outer member wound by the outer peripheral surface of this inner member, Comprising: The inner member which forms the said inner member and forming step, rolling the inner member in a plate-like member, by bonding both side ends of the plate-like member to form said plate-like member on the outer peripheral surface of the inner member as a cylindrical outer member, An outer member forming step.

  According to a second aspect of the present invention, in the inner member forming step, the inner member is formed by abutting both end portions of the inner plate-shaped member.

  According to a third aspect of the present invention, in the inner member forming step, the inner member is formed by cutting a pipe material or a solid material.

  According to a fourth 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 an indent that is a large number of depressions on the inner peripheral surface of the lining before the outer member forming step. An indentation forming step of forming.

  According to a fifth aspect of the present invention, the hardness of the outer member is smaller than the hardness of the inner member.

  In Claim 6, the both-sides edge part of the said plate-shaped member is formed in the clinch shape which can mutually be engaged, and the said both-sides edge of the said plate-shaped member is engaged in the said outer member formation process by engaging the said clinch shape. The parts are joined together.

  According to a seventh aspect of the present invention, in the outer member forming step, both side ends of the plate-like member are joined by welding.

  According to an eighth aspect of the present invention, a heat treatment step for heat-treating the inner member is provided before the outer member forming step.

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

  According to the manufacturing method of the sliding member according to the present invention, it is not necessary to manage the interference between the cylindrical outer and the inner with high accuracy, so that the time and cost for manufacturing the sliding member are suppressed. It becomes possible.

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). The bearing 40 is completed at the same time as the oil-impregnated finish (step S33).

  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 to constitute the plate-like pre-sintering member 10b.

  Next, in the sintering / rolling step (step S02) shown in FIG. 3, the pre-sintering member 10b configured in the powder spraying step (step S01) is placed in 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 the porous sintered layer 11, and the pre-sintering member 10 b becomes the sintered alloy 10 that is an inner plate member made of the 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 forming step (step S03) shown in FIG. 3, the sintered alloy 10 is pressed by a pressing machine (not shown), so that the surface of the sintered alloy 10 on the side of the sintered layer 11 (the lining of the bush 20). A large number of indents 10a, which are depressions, are formed on the inner peripheral surface. The indent 10a in the present embodiment is formed as a large number of spherical depressions, but it is also possible to adopt a configuration in which grooves are processed instead of the indent 10a.

  Next, in the rough bending process (step S11) shown in FIGS. 2 and 3, the sintered alloy 10 in which the indent 10a is formed in the indent forming process (step S03) is not shown so that the sintered layer 11 is on the inside. Bending is performed by winding with a bending machine or the like to form a bending member 10C having a semi-cylindrical central portion. The inner surface (the surface on which the indent 10a is formed) of the bending member 10C formed by this rough bending process 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.

  Next, in the oil impregnation / finishing step (step S33) shown in FIG. 2, 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 taken out into the air and allowed to cool to room temperature, the low-viscosity lubricating oil 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.

  That is, in this embodiment, when manufacturing the bearing 40, the cylindrical sintered material (inner) is not press-fitted into the inner peripheral portion of the cylindrical back metal (outer), but around the inner member (bush 20). The outer member (collar 30) is taken up. Thereby, since it is not necessary to manage the interference between the cylindrical inner member and the outer member with high accuracy, it is possible to reduce the time and cost for manufacturing the sliding member. In addition, although the bearing 40 according to the present embodiment is configured with two layers of the bush 20 and the collar 30, it may be configured with three or more layers including other members inside. That is, the member located at the outermost peripheral portion is a plate-like member, and both end portions thereof are butted and joined.

  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.

  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 indent formation process which forms the 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 indent 10a formed in the internal peripheral surface, and slidability can be improved.

  In the present embodiment, the collar 30 that is the outer member has a hardness lower than that of the bush 20 that is 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.

  Moreover, in this embodiment, the both-sides edge part of the plate-shaped member 17 is formed in the clinch shape which can be mutually engaged. And in the formation process of the collar | collar 30, the both ends of the plate-shaped member 17 (bending member 17C) are joined by engaging a clinch shape. As a result, the clinch shape can be engaged at the same time as the collar 30 is formed, and the number of steps can be reduced as compared with a configuration in which the collar 30 is separately joined. In addition, it is also possible to employ a configuration in which both side ends are joined by welding or the like without forming a clinch shape on the plate-like member in the formation process of the collar 30.

  Moreover, when forming the bush 20 which is an inner member, it is set as the structure which joins the both ends of the bending member 10C which is an inner side plate-shaped member by clinch, welding, etc. in a butt-forming process (step S12). Is also possible.

Further, in the present embodiment, a heat treatment step for heat treating the bush 20 is provided before the collar 30 formation step. Thereby, the hardness of the bush 20 (back metal 15 and the sintered layer 11) can be improved.
Further, even when there is a gap between the ends of the bush 20 that is the inner member in the butt-forming process (step S12), the gap can be closed in the outer member wrap-up process (step S32). Is possible.

DESCRIPTION OF SYMBOLS 10 Sintered alloy 11 Sintered layer 15 Back metal 17 Plate member 17C Bending member 20 Bush 30 Color 40 Bearing

Claims (8)

A manufacturing method of a sliding member comprising a cylindrical inner member and an outer member wound around the outer peripheral surface of the inner member,
Forming said inner member, an inner member forming step,
Rolling said inner member in a plate-like member, by bonding both side ends of the plate-like member to form said plate-like member on the outer peripheral surface of the inner member as a cylindrical outer member, the outer member forming step And comprising
The manufacturing method of the sliding member characterized by the above-mentioned. In the inner member forming step, the inner member is formed by butting both end portions of the inner plate-shaped member.
The manufacturing method of the sliding member of Claim 1 characterized by the above-mentioned. In the inner member forming step, the inner member is formed by cutting a pipe material or a solid material.
The manufacturing method of the sliding member of Claim 1 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 indent forming step of forming indents that are a number of depressions on the inner peripheral surface of the lining is provided.
The manufacturing method of the sliding member according to any one of claims 1 to 3, wherein The hardness of the outer member is smaller than the hardness of the inner member,
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. Both side ends of the plate-like member are formed in a clinch shape that can be engaged with each other,
In the outer member forming step, by joining the clinch shape, both end portions of the plate member are joined.
The manufacturing method of the sliding member according to any one of claims 1 to 5, wherein In the outer member forming step, both side ends of the plate-like member are joined by welding,
The manufacturing method of the sliding member according to any one of claims 1 to 5, wherein Before the outer member forming step, a heat treatment step of performing a heat treatment on the inner member is provided.
The manufacturing method of the sliding member according to any one of claims 1 to 7, wherein

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