Manufacturing method for rolling machine parts

Abstract

Improving the dimensional accuracy of rolling machinery parts. [Solution] A method for manufacturing a rolling machine part 100 comprises a first member 110 having a first track 113, a second member 120 having a second track 123, and a rolling element 130 disposed between the first track 113 and the second track 123, and includes a member arrangement step of arranging the first member 110 and the second member 120 in a state that constitutes a rolling machine part 100; a first jig arrangement step of arranging a first jig 311 in the first member 110 that prevents plastic deformation of a first part 117 which is a part other than the first surface that constitutes the first track 113; a second jig arrangement step of arranging a second jig 312 in the second member 120 that prevents plastic deformation of a second part which is a part other than the second surface that constitutes the second track 123; and a burnishing step of operating a burnishing member between the first track 113 and the second track 123.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a rolling machine part including a first member, a second member, and rolling elements disposed between the first member and the second member.

Background Art

[0002] For example, Patent Document 1 describes a technique for forming a track of a rolling machine part including a set of rails and ball-shaped rolling elements disposed therebetween by burnishing. Further, Patent Document 2 describes a technique for forming a track of a bearing including rolling elements which is one of rolling machine parts by burnishing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the inventor has found that depending on the object to be burnished, plastic deformation may also occur in portions other than the portion where the burnishing member abuts due to the burnishing, and the dimensions of the product assembled after the burnishing may deviate from the predetermined values.

[0005] The present invention has been made based on the above findings of the inventor, and provides a method for manufacturing a rolling machine part capable of improving the dimensional accuracy of the rolling machine part.

Means for Solving the Problems

[0006] A method for manufacturing a rolling machine component, according to one aspect of the present invention, is a method for manufacturing a rolling machine component comprising: a first member having a first track; a second member having a second track facing the first track; and a rolling element disposed between the first track and the second track, the method comprising: a member arrangement step of arranging the first member and the second member in a state constituting the rolling machine component; a first jig arrangement step of arranging a first jig in the first member that prevents plastic deformation of a first portion which is a part other than the surface constituting the first track; a second jig arrangement step of arranging a second jig in the second member that prevents plastic deformation of a second portion which is a part other than the surface constituting the second track; and a burnishing step of operating a burnishing member between the first track and the second track. [Effects of the Invention]

[0007] According to the present invention, the dimensional accuracy of rolling machine parts after burnishing can be improved. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing a rolling machine component manufactured by a method for manufacturing rolling machine components. [Figure 2] Figure 2 is a side view showing a rolling machine component manufactured by the method for manufacturing rolling machine components. [Figure 3] Figure 3 shows the flow of a manufacturing method for rolling machine parts. [Figure 4] Figure 4 is a side view showing the arrangement of each component using a jig. [Figure 5] Figure 5 is a side view showing alternative examples of the first and second jigs. [Modes for carrying out the invention]

[0009] The following describes embodiments of the method for manufacturing rolling machine parts according to the present invention, with reference to the drawings. The following embodiments are provided as examples to illustrate the present invention and are not intended to limit it. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, formulas, the content of each step in the method, and the order of each step shown in the following embodiments are examples and may include content not described below. Furthermore, geometric expressions such as parallel and orthogonal may be used, but these expressions do not indicate mathematical rigor and include substantially acceptable errors and deviations. Similarly, expressions such as simultaneous and identical also include substantially acceptable ranges.

[0010] Furthermore, the drawings are schematic diagrams that have been appropriately emphasized, omitted, or had their proportions adjusted to illustrate the present invention, and therefore differ from the actual shape, positional relationships, and proportions. Also, the X, Y, and Z axes shown in the drawings represent orthogonal coordinates arbitrarily set for the purpose of explaining the drawings. In other words, the Z axis is not necessarily an axis along the vertical direction, and the X and Y axes are not necessarily located in the horizontal plane.

[0011] Furthermore, in the following, multiple inventions may be described comprehensively as a single embodiment. Also, some of the content described below is described as an optional component relating to the present invention.

[0012] Figure 1 is a perspective view showing a rolling machine component 100 manufactured by the manufacturing method of the rolling machine component 100. Figure 2 is a side view showing a rolling machine component 100 manufactured by the manufacturing method of the rolling machine component 100. The rolling machine component 100 is a mechanical component in which two members operate relative to each other with a rolling member in between. The type of rolling machine component 100 is not limited. Examples of rolling machine component 100 include ball bearings and roller bearings. In this embodiment, a ball slide rail, which is one of the rolling machine component 100, will be used as an example for explanation. The rolling machine component 100 comprises a first member 110, a second member 120, and rolling elements 130.

[0013] The shape and structure of the first member 110, which is a component of the rolling machine part 100, are not limited. In this embodiment, the first member 110 is a rail formed by pressing, rolling, or other bending processes on a sheet metal material, and is equipped with a first track 113. The first member 110 also comprises a first base portion 111, a first arm portion 112, and a first track 113.

[0014] In this embodiment, the rolling mechanism component 100 is a ball slide rail, and the first member 110 is a so-called inner rail.

[0015] The first base portion 111 is the part that is fixed to other members. The first base portion 111 is a flat strip and has multiple first fixing holes 115 through which the fastening member 200 is inserted.

[0016] The first arm portion 112 is the portion that rises from both ends of the first base portion 111 in the width direction (Z-axis direction in the figure) toward the thickness direction (X-axis direction in the figure). The first arm portion 112 is formed from a sheet metal material of uniform thickness by bending, leaving the first base portion 111 intact, so as to rise from both ends in the width direction.

[0017] The first track 113 is formed by bending the first arm portion 112. The first track 113 is formed to be a V-shaped groove that opens outward in the width direction, recesses inward in the width direction, and extends in the sliding direction (Y-axis direction in the figure).

[0018] The shape, structure, etc. of the second member 120, which is a component of the rolling machine part 100, are not limited. In the case of this embodiment, the second member 120 is a member formed by subjecting a sheet metal material to bending processes such as press working and roll forming, similar to the first member 110, and includes a second track 123 facing the first track 113. In the assembled state of the rolling machine part 100 (see FIG. 1), the second member 120 is a member that can slide relative to the first member 110 along the longitudinal direction (Y-axis direction in the figure). The second member 120 includes a second base portion 121, a second arm portion 122, and a second track 123. In the case of this embodiment, the second member 120 is a so-called outer rail.

[0019] The second base portion 121 is a portion fixed to another member different from the member to which the first base portion 111 is fixed. The second base portion 121 is in the form of a flat plate strip wider than the first base portion 111, and a plurality of second fixing holes (not shown) through which the fastening member 200 is inserted are provided at a plurality of locations.

[0020] The second arm portion 122 is a portion that rises from both end edges in the width direction (Z-axis direction in the figure) of the second base portion 121 toward the thickness direction (X-axis direction in the figure) of the second base portion 121. The second arm portion 122 is formed by bending a sheet metal material with a uniform thickness so as to rise at both end portions in the width direction while leaving the second base portion 121. The second arm portion 122 is disposed outside the first arm portion 112 in the assembled state of the rolling machine part 100.

[0021] The second track 123 is formed by bending the second arm portion 122. The second track 123 is formed so as to be a V-shaped groove that opens toward the inner side in the width direction, is recessed toward the outer side in the width direction, and extends in the sliding direction. The second track 123 is disposed to face the first track 113 in the assembled state of the rolling machine part 100.

[0022] The rolling element 130 is a spherical member that is rotatably interposed between a first track 113 provided on the first member 110 and a second track 123 provided on the second member 120 so as to be opposite to the first track 113.

[0023] In this embodiment, the rolling mechanism component 100 is a ball slide rail, and the multiple rolling elements 130 are arranged in the direction of extension of the first member 110 (Y-axis direction in the figure) (the same applies to the direction of extension of the second member 120), and are rotatably held by a retainer 139.

[0024] Next, the manufacturing method for the rolling machine component 100 will be explained. Figure 3 is a diagram showing the flow of the manufacturing method for the rolling machine component 100.

[0025] (molding process) As a preliminary step to carrying out the manufacturing method of the rolling machine part 100, the first member 110 and the second member 120 are formed from sheet metal material by bending (S101).

[0026] (Selection process) With the first member 110 and the second member 120 arranged as a rolling machine component 100 (without the rolling elements 130), a combination of the first member 110 and the second member 120 that ensures the distance between the first track 113 and the second track 123 falls within a predetermined distance range is selected from among a plurality of first members 110 and a plurality of second members 120 (S102). This makes it possible to control the preload applied to the rolling elements 130 from the first member 110 and the second member 120 after burnishing within a predetermined range.

[0027] (Component placement process) Figure 4 is a side view showing the arrangement of each component using a jig. The first component 110 and the second component 120 are arranged using the component jig 300 to form the rolling machine component 100 (S103). In this embodiment, the first component 110 and the second component 120 are fixed to the component jig 300, which is configured to have the same arrangement as the first component 110 and the second component 120 in the completed rolling machine component 100, using fastening members 200.

[0028] (First jig placement process) In the first member 110, a first jig 311 is positioned to prevent plastic deformation of the first portion 117, which is the part other than the surface constituting the first track 113 (S104). The shape of the first jig 311 is not limited. In this embodiment, the first jig 311 is positioned by being fixed to the member jig 300. The first jig 311 is movably attached to the member jig 300. Note that the position of the first portion 117 shown in Figure 4 is illustrative, and the first jig 311 may also prevent plastic deformation of parts other than the first portion 117.

[0029] (Second jig placement process) In the second member 120, a second jig 312 is positioned to prevent plastic deformation of the second portion 118, which is the part other than the surface constituting the second track 123 (S105). The shape of the second jig 312 is not limited. In this embodiment, the second jig 312 is positioned by being fixed to the member jig 300. The second jig 312 is movably attached to the member jig 300. Note that the position of the second portion 118 shown in Figure 4 is illustrative, and the second jig 312 may also prevent plastic deformation of parts other than the second portion 118.

[0030] Note that the order of the component placement process, the first jig placement process, and the second jig placement process can be changed.

[0031] (Burnishing process) The burnishing member is operated between the first track 113 of the first member 110 and the second track 123 of the second member 120, which are fixed by the member jig 300 (S106). The burnishing member is not limited and may be a member with a shape and structure specifically for burnishing. In this embodiment, the burnishing member is a plurality of rolling elements 130. In other words, the burnishing member is not a dedicated one, but rather rolling elements 130 which are components of the rolling machine part 100 are used to perform the burnishing process.

[0032] The method of burnishing is not limited. In this embodiment, rolling elements 130, which also function as burnishing members, are placed between the first track 113 and the second track 123, and the first member 110 and the second member 120 are moved relative to each other in the direction of extension of the first member 110 (Y-axis direction in the figure) (the same direction of extension of the second member 120). In other words, the first member 110 and the second member 120 are subjected to the same operation as the normal operation of a ball slide rail.

[0033] Since the rolling element 130 is larger than the gap between the first raceway 113 of the first member 110 and the second raceway 123 of the second member 120, burnishing processes create groove-shaped rolling surfaces on the first raceway 113 and the second raceway 123 due to plastic deformation, and these rolling surfaces extend in the direction of extension of the first member 110.

[0034] Furthermore, during the burnishing process, the first member 110 bends so that the first track 113 moves inward around the first portion 117 or its vicinity, but the first jig 311 restricts the bending of the first member 110 within a range where springback is possible, preventing plastic deformation of the first member 110 other than the first track 113. Similarly, the second member 120 bends so that the second track 123 moves outward around the second portion 118 or its vicinity, but the second jig 312 restricts the bending of the second member 120 within a range where springback is possible, preventing plastic deformation of the second member 120 other than the second track 123.

[0035] The gap between the first raceway 113 and the second raceway 123 of the rolling machine component 100 obtained by the above manufacturing method satisfies a predetermined dimensional accuracy, and the elastic force of the first member 110 and the second member 120 can generate a predetermined pre-pressure on the rolling element 130.

[0036] It should be noted that the present invention is not limited to the embodiments described above. For example, other embodiments of the present invention may be realized by arbitrarily combining the components described herein, or by excluding some of the components. Furthermore, modifications obtained by applying various modifications to the above embodiments that a person skilled in the art could conceive of without departing from the spirit of the present invention, that is, the meaning indicated by the wording in the claims, are also included in the present invention.

[0037] For example, instead of restricting the deflection of the first member 110 and the second member 120 to a predetermined range as in the above embodiment, the first jig 311 may restrain the first member 110 and the second jig 312 may restrain the second member 120 so that they deflect by a predetermined amount, as shown in Figure 5. In this case, in the member placement step, the first member 110 and the second member 120 are placed so that the distance between the restrained first track 113 and the restrained second track 123 is a predetermined track distance, and in the burnishing step, a method is employed in which the burnishing member is operated until the operating resistance when operating the burnishing member is eliminated or almost eliminated.

[0038] Furthermore, after the burnishing process is completed, the burnishing member may be removed from between the first raceway 113 and the second raceway 123, and an assembly process may be included in which a plurality of rolling elements 130 having the same diameter as the burnishing member or a different diameter from the burnishing member are placed between the first raceway 113 and the second raceway 123.

[0039] Alternatively, the burnishing process may be carried out by fixing the first member 110 and the second member 120 and forcibly passing the burnishing member between the first track 113 and the second track 123.

[0040] (summary) A method for manufacturing a rolling machine component 100 according to a first embodiment includes a first member 110 having a first track 113, a second member 120 having a second track 123 facing the first track 113, and a rolling element 130 disposed between the first track 113 and the second track 123, and comprises: a member arrangement step of arranging the first member 110 and the second member 120 in a state constituting a rolling machine component 100; a first jig arrangement step of arranging a first jig 311 in the first member 110 that prevents plastic deformation of a first portion 117 which is a part other than the first surface constituting the first track 113; a second jig arrangement step of arranging a second jig 312 in the second member 120 that prevents plastic deformation of a second portion which is a part other than the second surface constituting the second track 123; and a burnishing step of operating a burnishing member between the first track 113 and the second track 123. According to the first embodiment, rolling machine parts 100 with high dimensional accuracy can be manufactured.

[0041] A second embodiment of the method for manufacturing a rolling machine component 100 includes the first embodiment, wherein the burnishing member is a plurality of rolling elements 130, and in the burnishing process, the burnishing member is placed between a first track 113 and a second track 123, and the first member 110 and the second member 120 are moved relative to each other.

[0042] A third embodiment of the method for manufacturing a rolling machine component 100 includes the first or second embodiment and includes an assembly step in which, after the completion of the burnishing step, the burnishing member is removed from between the first track 113 and the second track 123, and a plurality of rolling elements 130 having a different diameter from the burnishing member are placed between the first track 113 and the second track 123.

[0043] According to the third embodiment, the pre-pressure applied to the rolling element 130 can be adjusted.

[0044] The fourth embodiment of the method for manufacturing a rolling machine part 100 includes any of the first to third embodiments and includes a selection step of selecting a combination of a first member 110 and a second member 120 from a plurality of first members 110 and a plurality of second members 120 such that the distance between the first track 113 and the second track 123 falls within a predetermined distance range.

[0045] According to the fourth embodiment, it becomes possible to fit the manufactured rolling machine part 100 into predetermined dimensions.

[0046] The fifth embodiment of the method for manufacturing a rolling machine part 100 includes any of the first to fourth embodiments, wherein in the first jig placement step, the first member 110 is restrained by the first jig 311, in the second jig placement step, the second member 120 is restrained by the second jig 312, in the member placement step, the first member 110 and the second member 120 are arranged such that the distance between the restrained first track 113 and the restrained second track 123 is a predetermined track distance, and in the burnishing step, the burnishing member is operated until the operating resistance when operating the burnishing member is eliminated or almost eliminated. [Industrial applicability]

[0047] This invention can be used in all types of rolling machine components in which two members move relative to each other with a rolling element in between. [Explanation of Symbols]

[0048] 100...Rolling machine part, 110...First member, 111...First base, 112...First arm, 113...First track, 115...First fixing hole, 117...First part, 118...Second part, 120...Second member, 121...Second base, 122...Second arm, 123...Second track, 130...Rolling element, 139...Holder, 200...Fastening member, 300...Member jig, 311...First jig, 312...Second jig

Claims

1. A method for manufacturing a rolling machine part comprising a first member having a first track, a second member having a second track facing the first track, and a rolling element disposed between the first track and the second track, A member arrangement step in which the first member and the second member are arranged in a state that constitutes the rolling machine component, The first member comprises a first jig placement step of placing a first jig that prevents plastic deformation of the first portion, which is a part other than the surface constituting the first track, The second member comprises a second jig placement step of placing a second jig to prevent plastic deformation of the second portion, which is a part other than the surface constituting the second track, A burnishing step in which a burnishing member is moved between the first and second rails, A method for manufacturing rolling machine parts, including [the specified material].

2. The burnishing member is It consists of multiple rolling elements, In the aforementioned burnishing process, A burnishing member is placed between the first and second rails, and the first and second members are moved relative to each other. A method for manufacturing rolling machine parts according to claim 1.

3. After the burnishing process is completed, The assembly process includes removing the burnishing member from between the first and second raceways and arranging a plurality of rolling elements of a different diameter from the burnishing member between the first and second raceways. A method for manufacturing rolling machine parts according to claim 2.

4. The process includes a selection step of choosing a combination of the first member and the second member from a plurality of first members and a plurality of second members such that the distance between the first and second tracks falls within a predetermined interval range. A method for manufacturing a rolling machine part according to claim 1 or 2.

5. In the first jig placement step, The first jig restrains the first member, In the second jig placement step, The second jig restrains the second member, In the aforementioned member arrangement step, The first member and the second member are arranged such that the distance between the constrained first trajectory and the constrained second trajectory is a predetermined trajectory distance. In the aforementioned burnishing process, The burnishing member is operated until the operating resistance to the burnishing member is eliminated or almost eliminated. A method for manufacturing a rolling machine part according to claim 1 or 2.

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