JP5643014B2 - COMPOSITE MAGNETIC MATERIAL, ITS MANUFACTURING METHOD, AND MOTION GUIDE USING COMPOSITE MAGNETIC MATERIAL - Google Patents

Description

  The present invention relates to a composite magnetic body, a manufacturing method thereof, and a motion guide device using the composite magnetic body.

  2. Description of the Related Art Conventionally, a technique for manufacturing a composite magnetic body in which a magnetic part and a non-magnetic part coexist is known by processing austenitic stainless steel. For example, the following Patent Document 1 discloses a method of making a portion heated by a laser non-magnetic by making it ferromagnetic by performing a drawing process on non-magnetic austenitic stainless steel and further performing a laser process. Has been. And according to the following Patent Document 1, magnetism is imparted to austenitic stainless steel made of metastable austenitic steel by generating work-induced martensite, and then local laser irradiation is performed to locally melt / It is said that a magnetic scale that is excellent in magnetic properties and relatively inexpensive can be manufactured with good economic efficiency by making the portion non-magnetic by rapid cooling.

Japanese Patent Publication No. 7-9361

  However, conventionally known composite magnetic materials and methods for manufacturing the same have been developed assuming parts that do not receive external forces such as a magnetic scale, and for example, relative rolling contact with a counterpart member. Alternatively, the composite magnetic body as described above cannot be used for a member such as a rolling sliding member used in a place where sliding contact occurs. This is because there has been no method in the prior art for producing a composite magnetic body having high hardness and coexistence of magnetism / nonmagnetism.

  On the other hand, in the technical field of motion guide devices composed of rolling sliding members, conventionally, movement control is performed by installing a magnetic scale, and functions such as anti-rotation using a magnetic action are added. The realization of a motion guide device with additional functions has been demanded. However, at present, there is no method for producing a composite magnetic body having high hardness but coexistence of magnetism and non-magnetism, and the rolling sliding member itself, which is a constituent member of the motion guide device, cannot be a composite magnetic body. . Therefore, as a countermeasure that has been taken so far, a magnetic scale, a glass scale, or the like made of a metal flat plate has been attached to a constituent member (track rail, etc.) of the motion guide device. However, a magnetic scale made of a metal flat plate has a problem that the measurement accuracy cannot be obtained because the coefficient of thermal expansion is different from that of the components of the motion guide device (track rail, etc.). There has been a problem that the mechanism and work for attaching to the constituent members (track rails, etc.) of the guide device are complicated and a lot of manufacturing costs are required. Therefore, the current situation is that motion guide devices having an additional function such as a magnetic scale are not sufficiently widespread.

  The present invention has been made in view of the above-described problems, and its object is to establish a method for producing a composite magnetic body that has high hardness but coexistence of magnetism / nonmagnetism, and the production. An object of the present invention is to provide a motion guide device having a function that has not existed before by applying a new composite magnetic body manufactured by the method to a rolling sliding member.

  In order to achieve the above object, the composite magnetic body according to the present invention, after austenitic stainless steel, which is a non-magnetic material, is subjected to low-temperature nitriding treatment to generate expanded austenite while maintaining non-magnetism. By applying heat treatment to the desired location to impart magnetism in the austenitic stainless steel, which is a nonmagnetic material in which expanded austenite is generated, partial magnetism is applied to the austenitic stainless steel, which is a nonmagnetic material. A region is formed.

  In addition, the method for producing a composite magnetic body according to the present invention includes an S phase generation step of generating expanded austenite while maintaining non-magnetism by performing low-temperature nitriding treatment on austenitic stainless steel that is a non-magnetic body, A partial magnetic region for austenitic stainless steel, which is a non-magnetic material, is obtained by performing heat treatment on a desired part of the austenitic stainless steel, which is a non-magnetic material in which expanded austenite is generated. The partial magnetization process of forming is performed.

Further, an inner member having a raceway surface on the outer surface, an outer member having a raceway surface facing the raceway surface of the inner member and disposed on the outer side of the inner member, and the both raceway surfaces the motion guide device comprising: a rollably arranged rolling elements, and at least one of said inner member and said outer member, is to be included in the composite magnetic body of the present invention described above be able to.

  According to the present invention, it is possible to produce a composite magnetic body having high hardness and coexistence of magnetism / nonmagnetism. In addition, by applying a new composite magnetic body manufactured by the manufacturing method of the present invention to a rolling sliding member, it is possible to provide a motion guide device having a function that has not existed before.

It is the figure which showed an example of the process pattern of the manufacturing method of the composite magnetic body which concerns on this invention. It is an external appearance perspective view which illustrates one form of the linear guide apparatus which concerns on this embodiment comprised by the rolling sliding member which consists of composite magnetic bodies. It is sectional drawing for demonstrating the infinite circuit with which the linear guide apparatus shown in FIG. 2A is provided. It is a figure which illustrates the case where a magnetic scale is formed with respect to the track rail with which the linear guide apparatus shown in FIG. 2A is equipped.

[Production Method of Composite Magnetic Material]
First, a method for producing a composite magnetic body according to the present invention will be described with reference to FIG. Here, FIG. 1 is a diagram showing an example of a processing pattern of the method of manufacturing a composite magnetic body according to the present invention.

  In the method for producing a composite magnetic body according to the present invention, austenitic stainless steel is used as a base material. In the composite magnetic body manufacturing method illustrated in FIG. 1, in particular, a case where SUS304 is selected as a base material will be described as an example.

  SUS304 selected as a base material has advantages such as non-magnetism, high corrosion resistance, and high toughness, but also has a drawback that it is inferior in galling resistance when used as it is because it is not hard enough to be used as a rolling sliding member. Have. In addition, the surface of SUS304 can be hardened by subjecting SUS304 to carburizing treatment or nitriding treatment, which is a general heat treatment, but in such a general treatment, the surface of SUS304 is martensite. Since it will be transformed, it will lose its corrosion resistance and non-magnetic state.

  Therefore, in the method for producing a composite magnetic body according to the present invention, first, low-temperature nitridation processing is performed on the SUS304 that is a non-magnetic body with a processing pattern indicated by reference numeral α in FIG. This low-temperature nitriding treatment is preferably performed at a temperature of 450 ° C. or less, and expanded austenite (S phase) can be generated while maintaining the non-magnetic state of SUS 304. Therefore, non-magnetic, high corrosion resistance, The surface can be cured while maintaining the advantage of SUS304, which is high toughness (S phase generation step).

  In addition, the inventors confirmed that the surface hardness of SUS304 in which expanded austenite (S phase) is generated by the S phase generation step described above is 800 or more in terms of Vickers hardness Hv. Thus, since the surface of SUS304 can be made high hardness by performing low temperature nitriding treatment, according to SUS304 in which expanded austenite (S phase) is generated by low temperature nitriding treatment, it is used for a motion guide device. Application to a rolling sliding member becomes possible. Note that the processing temperature of the low temperature nitriding treatment is preferably 450 ° C. or lower, but it is more preferable to perform the low temperature nitriding treatment of the present invention in a temperature range of 400 to 450 ° C. in order to stabilize the processing quality. .

  For SUS304, which is a non-magnetic material in which expanded austenite (S phase) is generated by the S phase generation process described above, a heat treatment such as laser hardening is performed on a desired location where magnetism is to be imparted. A partial magnetic region can be formed with respect to SUS304, which is a non-magnetic material (partial magnetization step).

  The heat treatment in this partial magnetization step is performed by a processing pattern indicated by symbol β in FIG. 1, and the heating temperature is preferably 500 ° C. or higher. In particular, when laser quenching is employed as a heating means of the heat treatment according to the present invention, a magnetic region and a non-magnetic region can be instantly cooled by heating a point where magnetism is to be imparted at a pinpoint. It is preferable that the boundary part is clearly divided. Furthermore, laser quenching can be used to accurately heat only a relatively narrow region, which is convenient when it is desired to accurately form a magnetic region range such as a magnetic scale. As described above, the laser quenching heating temperature is preferably 500 ° C. or higher. However, in order to stabilize the processing quality, the laser quenching treatment of the present invention is performed at a temperature range of 500 ° C. or higher and 550 ° C. or lower. It is more preferable to carry out.

  By carrying out the process including the S phase generation process and the partial magnetization process described above on SUS304, which is an austenitic stainless steel, a composite magnetic body that has high hardness but coexists with magnetism / nonmagnetism is manufactured. Is possible. And it becomes possible by providing the composite magnetic body manufactured by the manufacturing method of this invention to a rolling sliding member to provide the motion guide apparatus which has a function which is not in the past. Then, next, the case where the composite magnetic body manufactured with the manufacturing method of this invention is applied to a motion guide apparatus is demonstrated.

[Example of application to motion guidance devices]
A specific embodiment of a motion guide device using a composite magnetic body manufactured by the manufacturing method of the present invention as a rolling sliding member will be described with reference to the drawings. It should be noted that the embodiments of the motion guidance apparatus exemplified below do not limit the invention according to each claim, and all the combinations of features described in the embodiments are essential for the solving means of the invention. Not necessarily. The “motion guide device” in this specification includes, for example, rolling bearings used in machine tools and the like, non-lubricated bearings used in vacuum, linear guides and linear guide devices, linear bushes, ball spline devices, balls It shall be defined to include devices with any rolling and sliding motion, such as screw devices, roller screw devices, cross roller rings, etc.

(Application example to linear guide device)
The motion guide device according to the present embodiment can be configured as a linear guide device 10 as shown in FIGS. 2A and 2B, and one member of the linear guide device 10, for example, the track rail 11, has the above-described composite magnetism. By constituting the body, the linear guide device 10 having a scale function can be provided. The linear guide device 10 is a rolling sliding member having the characteristics of being a composite magnetic body in which magnetism / nonmagnetism coexist while having the significant characteristics of austenitic stainless steel such as high hardness, high corrosion resistance, and high toughness. Is the first device realized by applying to the linear guide device 10.

  Here, FIG. 2A is an external perspective view illustrating one embodiment of the linear guide device according to this embodiment configured by a composite magnetic body. Moreover, FIG. 2B is sectional drawing for demonstrating the infinite circuit provided with the linear guide apparatus shown in FIG. 2A.

  First, the configuration of the linear guide device 10 illustrated in FIGS. 2A and 2B will be described. The linear guide device 10 as the motion guide device according to this embodiment includes a track rail 11 as an inward member, and a track rail 11. And a moving block 13 as an outer member slidably attached via balls 12... Installed as a large number of rolling elements. The track rail 11 is a long member whose cross section perpendicular to the longitudinal direction is formed in a substantially rectangular shape, and the surface (upper surface and both side surfaces) of the track rail 11 is a track surface that becomes a track when the balls 12 roll. Are formed over the entire length of the track rail 11.

  The track rail 11 may be formed to extend linearly or may be formed to extend in a curved line. Moreover, although the number of rolling element rolling surfaces 11a ... illustrated in FIG. 2A and FIG. 2B is provided in a total of four, two on the left and right sides, the number of the strips is arbitrarily determined according to the application of the linear guide device 10 and the like. Can be changed.

  On the other hand, the moving block 13 is provided with a loaded rolling element rolling surface 13a as a raceway surface at a position corresponding to each of the rolling element rolling surfaces 11a. The rolling element rolling surface 11a of the track rail 11 and the loaded rolling element rolling surface 13a of the moving block 13 form a load rolling path 22 and a plurality of balls 12 are sandwiched therebetween. Further, the moving block 13 is provided with four unloaded rolling paths 23 extending in parallel with the rolling element rolling surfaces 11a, and the direction change connecting the unloaded rolling paths 23 and the loaded rolling paths 22. Paths 25 are provided. One endless circulation path is configured by a combination of one load rolling path 22 and no-load rolling path 23 and a pair of direction switching paths 25 connecting them (see FIG. 2B).

  A plurality of balls 12 are installed in an infinite circulation path composed of a load rolling path 22, a no-load rolling path 23 and a pair of direction changing paths 25, 25 so as to be capable of infinite circulation, thereby moving block 13. Is reciprocally movable relative to the track rail 11.

In the linear guide device 10 according to the present embodiment having the above-described configuration , at least one of the track rail 11 as the inner member or the moving block 13 as the outer member is the book described above. It can be comprised by the composite magnetic body manufactured by the manufacturing method of invention.

  For example, the track rail 11 as an inward member in the linear guide device 10 according to the present embodiment can be formed of a composite magnetic body. When the partial magnetization process described above is performed on the track rail 11, laser beam machining is performed so that the pattern shown in FIG. Acquire to become a magnetic scale 15. Thereby, the track rail 11 provided with the magnetic scale 15 by one member is realizable.

  That is, a magnetic reading head (not shown) is provided on the moving block 13 side, and this magnetic reading head is disposed at a position opposite to the position where the magnetic scale 15 of the track rail 11 is formed. It is possible to grasp the amount of position movement. In particular, in the case of the magnetic scale 15 shown in FIG. 2C, since the magnetic scale 15 is directly formed on the track rail 11 by laser processing, the measurement accuracy deteriorates due to temperature as in the prior art, or the forming work Is preferable because it is not complicated.

  In this case, the track rail 11 is repeatedly subjected to rolling load or sliding load from the balls 12..., But the composite magnetic body manufactured by the manufacturing method of the present invention is subjected to the Vickers hardness by the S phase generation process described above. Since the surface hardness is 800 or more at a height Hv, the location where the magnetic scale 15 is formed is preferable because of high hardness. By such a suitable effect, the composite magnetic body of the present invention can exhibit the function as the track rail 11 without any problem.

  In the case of the magnetic scale 15 shown in FIG. 2C, the formation location is one side surface of the track rail 11, but the formation location of the magnetic scale 15 may be any location. This selection may be made according to the use environment, shape, etc. of the linear guide device 10.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment.

  For example, in the above-described embodiment, the linear guide device 10 has been described as an example of application of the composite magnetic body according to the present invention to the motion guide device. However, the composite magnetic body according to the present invention can be applied to any type of motion guide device, for example, a rolling bearing, a non-lubricated bearing, a linear bush, a ball spline device, a ball screw device, a roller screw device, a cross. The present invention can be applied to a device with any rolling operation and sliding operation such as a roller ring.

  In the above-described embodiment, the case where the composite magnetic body according to the present invention is used as a magnetic scale has been described as an example. However, the use of the composite magnetic body according to the present invention is not limited to the magnetic scale. . As for the characteristics of the composite magnetic material in which magnetism / nonmagnetism coexist, it can be used, for example, as a rod detent in a linear bush, or as a magnetic guide or a magnetic screw. Further, it is possible to configure a magnetic XY table or a magnetic shutter by devising a route for performing laser processing.

  Furthermore, in the above-described embodiment, the case where laser quenching is employed as the heat treatment of the present invention has been described as an example, but any heating means may be employed as long as the above-described heating temperature condition can be satisfied. Good.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 Linear guide apparatus, 11 Track rail, 11a Rolling-element rolling surface, 12 balls, 13 Moving block, 13a Loaded rolling-element rolling surface, 15 Magnetic scale, 22 Loaded rolling path, 23 Unloaded rolling path, 25 direction change path .

Claims (7)

For austenitic stainless steel, which is a non-magnetic material,
After generating expanded austenite while maintaining non-magnetism by performing low temperature nitriding treatment,
A partial magnetic region for austenitic stainless steel, which is a non-magnetic material, is obtained by performing heat treatment on a desired part of the austenitic stainless steel, which is a non-magnetic material in which expanded austenite is generated. A composite magnetic body characterized in that is formed. The composite magnetic body according to claim 1,
The composite magnetic body, wherein the heat treatment is laser quenching. For austenitic stainless steel, which is a non-magnetic material,
An S phase generation step of generating expanded austenite while maintaining non-magnetism by performing low temperature nitriding treatment;
A partial magnetic region for austenitic stainless steel, which is a non-magnetic material, is obtained by performing heat treatment on a desired part of the austenitic stainless steel, which is a non-magnetic material in which expanded austenite is generated. A partial magnetization step to form
The manufacturing method of the composite magnetic body characterized by performing the process containing these. In the manufacturing method of the composite magnetic body of Claim 3,
The method for producing a composite magnetic body, wherein the heat treatment is laser quenching. In the manufacturing method of the composite magnetic body of Claim 3 or 4,
The method for producing a composite magnetic material, wherein the low-temperature nitriding treatment is performed at a treatment temperature of 450 ° C. or less. In the manufacturing method of the composite magnetic body of any one of Claims 3-5,
The method of manufacturing a composite magnetic body, wherein the heat treatment in the partial magnetization step is performed at a heating temperature of 500 ° C. or higher. An inner member having a raceway surface on the outer surface;
An outer member having a raceway surface facing the raceway surface of the inner member and disposed outside the inner member;
A rolling element disposed so as to be freely rollable between the two raceway surfaces;
In an exercise guidance device comprising:
Wherein at least one of the inner member or the outer member, the motion guide device, characterized in that it is configured to include a composite magnetic body according to claim 1 or 2.

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