JP2008151318A - Sliding guide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding guide with a base having a guide face formed thereon, preventing the wear of a sliding surface at both longitudinal ends while suppressing the flotation due to dynamic pressure of lubricating oil during sliding on the guide surface. <P>SOLUTION: The sliding guide 10 comprises the base 11 having the guide surface 13 formed thereon, and a sliding thin plate 20 formed of a resin material and pasted onto a face 19 of a movable body 14 opposed to the guide surface 13 in the longitudinal direction of the face 19 of the movable body 14, wherein the sliding surface 21 formed on the lower face of the sliding thin plate 20 slides via lubricating oil on the guide surface 13 in the longitudinal direction to guide the movable body 14. The sliding thin plate 20 has higher hardness at either longitudinal end than at the center. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a slide guide device in which a guide surface is formed on a base of a machine tool or the like, and a movable body is guided by sliding a slide surface on the guide surface with lubricating oil interposed therebetween. In particular, the present invention relates to one that suppresses the tilting of the movable body due to the dynamic pressure of lubricating oil.

2. Description of the Related Art Conventionally, a machine tool or the like has a guide surface formed on a base, and a sliding guide in which a movable body is guided by sliding the slide surface in the longitudinal direction with lubricating oil interposed on the guide surface. The device is used. In the slide guide device disclosed in Patent Document 1, a plurality of divided grooves extending in the width direction of the slide surface are formed on the slide surface of the movable body at intervals in the longitudinal direction, and are divided by the divided grooves. Each slide surface is provided with a lubricating oil groove to which lubricating oil is supplied, and a pocket portion connected to the central dividing groove is formed at a substantially central portion in the longitudinal direction of the slide surface.
JP 2001-280343 A (paragraphs [0041] to [0043], FIG. 4)

  The slide guide device described in Patent Document 1 has a slide surface that is generated when the movable body moves because a pocket portion that communicates with the dividing groove is formed at substantially the center in the longitudinal direction of the slide surface of the movable body. A large dynamic pressure at the center of the movable body can be released to the atmosphere to reduce the floating of the movable body. Further, the slide surface is divided into a plurality of slide surfaces in the longitudinal direction by the dividing grooves, and the lubricating oil grooves to which the lubricating oil is supplied are formed on the respective divided sliding surfaces, so that the lubricating oil is generated by the movement of the movable body. The dynamic pressure is released to the atmosphere through the dividing grooves and is distributed to each divided slide. Thereby, it is possible to reduce the bias of the longitudinal pressure distribution of the dynamic pressure acting on the slide surface, to reduce the floating of the movable body, and to suppress the inclination.

  According to the above sliding guide device, the movable body is reduced in lift and is guided with high accuracy, but it is suppressed to the inclination of the movable body due to a relatively large dynamic pressure generated when the movable body is accelerated or decelerated. I can't. As a result, since the lift of the movable body slide surface from the guide surface is small, the repeated slide surfaces at both ends in the longitudinal direction come into contact with the guide surface and wear due to slight inclination of the movable body during repeated acceleration and deceleration. May occur.

   An object of the present invention is to prevent wear at both ends in the longitudinal direction of a slide surface that slides on a guide surface formed on a base with lubricating oil interposed.

  In order to solve the above-mentioned problem, the structural feature of the invention described in claim 1 is that a guide surface is formed on a base and a surface of a movable body facing the guide surface is formed of a resin material. In a sliding guide device in which a sliding thin plate is affixed in the longitudinal direction, and a movable body is guided by sliding a sliding surface formed on the lower surface of the sliding thin plate in the longitudinal direction on the guiding surface with lubricating oil interposed therebetween. The both end portions in the longitudinal direction of the sliding thin plate are harder than the central portion.

  A structural feature of the invention according to claim 2 is that, in claim 1, the sliding thin plate is formed of a sliding thin plate that is separate from the central portion at least at both ends.

  The structural feature of the invention according to claim 3 is that the both ends in the longitudinal direction of the sliding thin plate are formed of a resin material having a hardness higher than that of the central portion in claim 1 or 2, so that both ends are formed. This is because the part has a higher hardness than the central part.

  The structural feature of the invention according to claim 4 is that, in claim 3, by dispersing copper alloy powder finer than the resin material of the central portion in the fluorine resin at the both ends of the sliding thin plate. It is formed.

  A structural feature of the invention according to claim 5 is that, in claim 3, by dispersing a larger amount of copper alloy powder in the fluororesin at the both ends of the sliding thin plate than the resin material at the center. It is formed.

  The structural feature of the invention according to claim 6 is that, in any one of claims 1 to 5, the both ends of the slip thin plate are made higher than the central portion by DLC coating on the slip thin plate at the both ends of the slip thin plate. That is hardness.

  In the invention according to claim 1 configured as described above, since the hardness of both ends in the longitudinal direction of the sliding thin plate attached to the surface of the movable body facing the guide surface is higher than that of the central portion, the movable body slides. Even if the end of the sliding surface formed on the lower surface of the sliding thin plate contacts with the guide surface, it is less likely to wear and has a simple structure with high reliability with improved wear resistance and seizure resistance. A slip guide device can be provided. Furthermore, since the surface of the movable body facing the guide surface is finished in the middle in the longitudinal direction for processing, it is affixed to form a straight slide surface by sliding on the lower surface of the affixed slip sheet. It is necessary to remove more of the lower surface of the center part of the sliding thin plate than both ends by scraping. According to the present invention, the center portion with a large machining allowance has a lower hardness than both end portions with a small machining allowance, and therefore, scraping for forming a straight slide surface is facilitated.

  In the invention according to claim 2 configured as described above, the sliding thin plate is formed of a sliding thin plate that is separate from the central portion at least at both ends, so in addition to the effect of the invention according to claim 1, It is possible to easily create a sliding thin plate at both ends that is harder than the sliding thin plate at the center.

  In the invention according to claim 3 configured as described above, the slide having the same effect as that of the invention according to claim 1 can be achieved with a simple configuration in which both end portions of the sliding thin plate are formed of a resin material having a hardness higher than that of the central portion. A guidance device can be provided.

  In the invention according to claim 4 configured as described above, since both ends of the sliding thin plate have higher hardness by dispersing finer copper alloy powder in the fluororesin than in the center, In addition to the effects exhibited by the invention, a sliding surface having the same amount of copper alloy and having good affinity with the lubricating oil can be formed at low cost.

  In the invention according to claim 5 configured as described above, both ends of the sliding thin plate have a higher hardness by dispersing a larger amount of copper alloy powder in the fluororesin than in the center. In addition to the effects exhibited by the invention, it is possible to form a slide surface with better affinity with the lubricating oil.

  In the invention according to claim 6 configured as described above, since the sliding thin plate at both ends is DLC-coated, the hardness is higher than that of the sliding thin plate at the center, so that the wear resistance and seizure resistance are improved. A highly reliable slip guide device can be provided. Furthermore, even after the DLC coating is unevenly worn, the slide surface can slide on the guide surface with the underlying resin material layer to prevent seizure.

  Hereinafter, a movable body feeding device of a machine tool provided with a slide guide device 10 according to an embodiment of the present invention will be described based on the drawings. As shown in FIGS. 1 and 2, a pair of guide rails 12 extend in parallel on a base 11, and a movable body 14 is slidably mounted on a guide surface 13 formed on the upper surface of the guide rail 12. Is placed. Two concave grooves 15 into which the pair of guide rails 12 are respectively inserted are engraved on the lower surface of the movable body 14, and the movable body 14 is prevented from being lifted by contacting the lower surface of the jaw portion of each guide rail 12. The back plate 16 is fixed. A razor 17 is interposed between the inner side surface of one guide rail 12 and the inner side wall of the recessed groove 15 into which the guide rail 12 is inserted. By adjusting the thickness of the razor 17, the inner side surface of the other guide rail 12 and Is in sliding contact with the inner side wall of the recessed groove 15 into which is inserted.

  A ball screw shaft 18 that is rotationally driven by a servo motor (not shown) is rotatably supported on the upper surface of the base 11 so as to be rotatable in parallel with the guide rail 12 between a pair of guide rails 12. A nut 28 to be screwed with the screw shaft 18 is fixed. Accordingly, when the ball screw shaft 18 rotates, the movable body 14 is guided by the pair of guide rails 12 and slides on the guide surface 13.

  On the surface 19 of each concave groove 15 of the movable body 14 facing the guide surface 13, a plurality of sliding thin plates 20 formed of a resin material that is a constituent element of the sliding guide device 10 are provided in the longitudinal direction of the surface 19. In this form, four sheets are stuck continuously. A slide surface 21 is formed on the lower surface of the four sliding thin plates 20, and the slide surface 21 slides in the longitudinal direction on the guide surface 13 with the lubricating oil interposed therebetween, so that the movable body 14 is guided.

  As shown in FIGS. 1 to 3, S-shaped lubricating oil grooves 22 are formed on the slide surfaces 21 of the two sliding thin plates 20 a at both ends in the four sliding thin plates 20. On the bottom surface of the lubricating oil groove 22, a supply hole 23 formed in the movable body 14 and penetrating the sliding thin plate 20a is opened through a throttle. The supply hole 23 is a lubricating oil having a hydraulic pump that is driven to rotate by a motor. The supply device 24 is connected by piping. A pair of sliding thin plates 20b in the center is provided with a U-shaped lubricating oil groove 25, which is connected to the lubricating oil supply device 24 through the supply hole 23 in the same manner as the S-shaped lubricating oil groove 22. Has been.

  A split groove 26 opened to the atmosphere on both side surfaces extending in the longitudinal direction of the sliding thin plate 20 is carved in the width direction of the sliding surface 21 at the joint portion of the sliding thin plate 20 adjacent to the sliding surface 21. 21 is divided into four by the dividing groove 26.

  On the slide surface 21 of the two sliding thin plates 20b in the center, a rhombus-shaped pocket portion 27 is engraved with a dividing groove 26 that is engraved across the two. The pocket portion 27 is engraved with a large area and functions as an oil sump. Since the dynamic pressure of the lubricating oil held in the pocket portion 27 is released to the atmosphere through the dividing groove 26, a high dynamic pressure is not generated at the center portion of the slide surface 21, and the floating of the movable body 14 is reduced.

  Further, the slide surface 21 is divided into four parts by the dividing grooves 26, and S-shaped or U-shaped lubricating oil grooves 22 and 25 are formed to supply lubricating oil to the divided slide surfaces 21. Therefore, the dynamic pressure generated in the lubricating oil due to the movement of the movable body 14 is released to the atmosphere from the divided grooves 26 and is distributed to the divided slide surfaces. Thereby, the bias of the pressure distribution of the dynamic pressure acting on the slide surface 21 is reduced, the floating of the movable body 14 is reduced, and the inclination is suppressed.

  According to the slide guide device 10 described above, the movable body 14 is reduced in lift and is guided with high accuracy. However, the movable body is caused by a relatively large dynamic pressure generated in the lubricating oil when the movable body 14 is accelerated or decelerated. It cannot be suppressed up to an inclination of 14. As a result, the sliding surfaces 21 formed on the sliding thin plates 20a at both ends may come into contact with the guide surface 13 and wear due to the inclination of the movable body 14 while the acceleration / deceleration is repeated.

  In order to suppress the wear of the slide surface 21 formed on the sliding thin plates 20a at both ends, in the sliding guide device 10, the sliding thin plates 20a at both ends of the four sliding thin plates 20 are the sliding thin plates 20b at the center. It is made of a harder resin material. The sliding thin plate 20 is formed by dispersing particles of a copper alloy such as bronze in a fluorine resin or the like, and cutting a material formed into a plate shape having a thickness of about 1 mm into a rectangle having an appropriate size.

  Thus, the sliding thin plates 20a at both ends of the four sliding thin plates 20 attached to the surface 19 of the movable body 14 facing the guide surface 13 of the base 11 in the longitudinal direction are the sliding thin plates 20b at the center. Since the hardness is higher, even when the movable body 14 is inclined when sliding and the slide surface 21 formed on the lower surface of the sliding thin plate 20a at both ends contacts the guide surface 13, it is less likely to wear and wear-resistant. And a highly reliable slide guide device 10 with improved seizure resistance and seizure resistance. Further, when the movable body 14 having a large weight is clamped on, for example, a table of a grinding machine and the sliding thin plate 20 affixed to the surface 19 is ground to form the slide surface 21, the slide surface 21 becomes movable. Due to the influence of the rigidity of the grinding machine and the rigidity of the grinding machine, the center part is finished to a medium to high height. In order to take this medium height, the slide surface 21 is finished straight by sliding. The bottom surface of the sliding thin plate 20b affixed to the central portion in the sliding process needs to be removed more than the sliding thin plates 20a at both ends by scraping, but in the sliding guide device 10, the sliding thin plate 20b in the central portion having a large allowance is required. Since it has a lower hardness than the sliding thin plates 20a at both ends with a small machining allowance, scraping for forming the straight slide surface 21 is facilitated. The lubricating oil grooves 22 and 25, the pocket portion 27, and the dividing groove 26 are cut by cutting before the scraped surface 21 is scraped.

  Since the sliding thin plate 20a at both ends has a higher hardness than the sliding thin plate 20b at the center, the hardness of the resin material in which the copper alloy is dispersed is higher at the sliding thin plate 20a at both ends than at the sliding thin plate 20b at the center. Good. In order to increase the hardness of the resin material, the components contained in the resin may be adjusted, or the copper alloy powder may be dispersed in the resin and formed into a plate shape, and then fired in a nitrogen atmosphere. When fired in a nitrogen atmosphere, the bond between the resin and the copper alloy powder becomes stronger, and the hardness of the resin material becomes higher than when fired in air.

  Further, the amount of bronze dispersed in the fluorine-based resin is the same, and the size of the bronze particles is made smaller at the sliding thin plate 20a at both ends than at the sliding thin plate 20b at both ends, thereby causing the sliding thin plates 20a at both ends. This may be higher in hardness than the sliding thin plate 20b at the center. Thus, when the particles of bronze, which is a copper alloy, are made fine, it is possible to obtain the sliding thin plate 20a having a fine structure and high hardness even if the amount of copper alloy used is the same. And since copper reacts with the additive in lubricating oil and affinity with lubricating oil is good, it can form a slide surface with good wear resistance.

  Furthermore, the sliding thin plate 20a at both ends disperses a larger amount of copper alloy powder in the fluororesin than the thin plate 20b at the central portion, so that the sliding thin plate 20a at both ends has a higher hardness than the sliding thin plate 20b at the central portion. You may make it be. By increasing the amount of the copper alloy, it is possible to form a slide surface with better affinity with the lubricating oil.

  Further, instead of constituting the sliding thin plate 20a at both ends with a resin material having a hardness higher than that of the sliding thin plate 20b at the central portion, both ends of the sliding thin plate 20a are coated with diamond-like carbon (DLC coating). The sliding thin plate 20a at the part may be harder than the sliding thin plate 20b at the center. Since the sliding thin plate 20a at both ends is formed separately from the sliding thin plate 20b at the central portion, the sliding thin plate 20a at both ends can be made smaller, and the DLC coating is applied before being attached to the surface 19 of the movable body 14. It can be done easily. Even if the DLC coating is unevenly worn due to long-term use of the sliding guide device 10, the sliding surfaces 21 formed on the sliding thin plates 20a at both ends slide on the guiding surface 13 with the underlying resin material layer to prevent seizure. Can do.

  Alternatively, the DLC coating may be applied to the lower surface of the sliding thin plate 20a at both ends after the sliding thin plate 20a at both ends is formed of a resin material that is harder than the sliding thin plate 20b at the center.

  In the above-described embodiment, a slip sheet made of a plurality of resin materials is attached to the surface 19 of the movable body 14 facing the guide surface 13 of the base 11, and the hardness of the slip sheets 20a at both ends is set at the center. Although it is higher than the sliding thin plate 20b, a single elongated sliding thin plate having both ends harder than the central portion may be attached to the surface 19, and a sliding surface may be formed on the lower surface of the sliding thin plate.

  Further, in the above embodiment, the central sliding thin plate is composed of two sheets, but the central sliding thin plate is composed of one or more than two sliding thin plates, and both end slips are formed at both ends thereof. You may make it stick a thin plate side by side.

  In the above embodiment, the dividing groove 26 is open to the atmosphere on both side surfaces extending in the longitudinal direction of the sliding thin plate 20, but the relief groove that terminates in front of both side edges extending in the longitudinal direction on the sliding surface. In place of the dividing groove 26, the sliding surface 21 is divided into a plurality of parts by making an escape hole in the movable body having one end opened to the bottom surface of the relief groove and the other end opened to the atmosphere. Also good.

  Moreover, in the said embodiment, although the slide surface 21 is divided | segmented into plurality by the division groove 26, the slide thin plate of the slide guide apparatus 10 of the type which is not divided | segmented by the division groove 26 or the escape groove is used. You may make it make the hardness of both ends higher than the hardness of a center part.

Sectional drawing which shows the movable body feeding apparatus provided with the slip guide apparatus which concerns on this Embodiment, and was cut | disconnected along the 1-1 line | wire of FIG. Sectional drawing which shows the slip guide apparatus which concerns on this Embodiment, and was cut | disconnected along the 2-2 line of FIG. The figure which shows the slide surface formed in the slip thin board.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Sliding guide apparatus, 11 ... Base, 12 ... Guide rail, 13 ... Guide surface, 14 ... Movable body, 15 ... Groove, 19 ... Surface, 20 ... Sliding thin plate, 20a ... Sliding thin plate of both ends, 20b ... Sliding thin plate in the central part, 21 ... slide surface, 22, 25 ... lubricating oil groove, 26 ... dividing groove, 27 ... pocket part.

Claims (6)

A guide surface is formed on the base, a sliding thin plate made of a resin material is stuck to the surface of the movable body facing the guide surface in the longitudinal direction, and the sliding surface formed on the lower surface of the sliding thin plate is a lubricant. In the sliding guide device in which the movable body is guided by sliding in the longitudinal direction on the guide surface via
A sliding guide apparatus characterized in that both ends in the longitudinal direction of the sliding thin plate are harder than the central portion. 2. The sliding guide device according to claim 1, wherein the sliding thin plate is formed of a sliding thin plate that is separated from the central portion at least at both ends. In Claim 1 or 2, the both ends were made harder than the center part by forming the both ends of the longitudinal direction of the sliding thin plate with a resin material harder than the center part. Sliding guide device. 4. A sliding guide device according to claim 3, wherein said both ends of said sliding thin plate are formed by dispersing a copper alloy powder finer than the resin material of said central portion in a fluorine-based resin. 4. The sliding guide device according to claim 3, wherein the both ends of the sliding thin plate are formed by dispersing a larger amount of copper alloy powder in a fluorine-based resin than the resin material of the central portion. 6. The sliding guide device according to claim 1, wherein both ends of the sliding thin plate have higher hardness than the central portion by DLC coating on the sliding thin plate at both ends of the sliding thin plate.

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