Grinding Machine

Abstract

To provide a grinder which realizes a guide mechanism which has higher durability while suppressing vibration.SOLUTION: A grinder includes, on a sheet material 130 fastened to a guide member of a guide mechanism, a groove part 141 provided at the sheet material 130 and an oil supply port 142 provided within the groove part 141. The guide member makes surface contact with a guided member through the sheet material 130 to supply a lubrication oil supplied from the oil supply port 142 to the sheet material 130 in a more efficient manner through the groove part 141 while suppressing subtle vibration and thereby inhibit deterioration caused by wear of the sheet material 130. The structure can inhibit performance deterioration of the guide mechanism.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a grinding machine for grinding a workpiece, and more particularly to a grinding machine having an improved sliding surface. [Background technology]

[0002] Conventionally, in grinding machines, ball guides and hollow roller guides suitable for guiding with high-speed movement have been used as the guide mechanism for the table that supports the workpiece to be ground. In addition, a technology is known in which a sliding guide using a fluororesin material in the sliding part is applied to the guide mechanism of the table in machine tools including grinding machines. Patent Document 1 discloses a structure that is as easy to manufacture as possible for a sheet-like sliding member that is used in combination with a lubricating oil whose main component is polytetrafluoroethylene resin. In the structure of Patent Document 1, in a sliding member that forms a guide surface or a guided surface in a guide structure of a machine tool that has a guide surface that guides a support table of a workpiece in a predetermined direction, a guided surface that is guided by sliding contact with the guide surface, and a lubricating oil that is held between the guide surface and the guided surface, the sliding member is made of a sheet-like base material whose main component is polytetrafluoroethylene resin, both sides of the sheet-like base material are chemically treated to improve adhesion, and a plurality of convex parts are provided on the lubricating oil holding surface of the sheet-like base material, and the tops of the convex parts are polished to provide a plurality of sliding surfaces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-23180 A Summary of the Invention [Problem to be solved by the invention]

[0004] When ball guides or hollow roller guides are used as the guide mechanism for the table of a grinding machine, the ball guides or hollow roller guides are in point contact with the guide member or the guided object. Therefore, the gaps between the balls or the hollow rollers cause minute vibrations in the table when the table moves. This causes the problem of uneven grinding on the surface of the workpiece to be ground due to the generated vibrations. On the other hand, as an example of a guide mechanism for low load that does not use a ball guide or a hollow roller guide, a sliding guide has been proposed for the guide mechanism of the table of a grinding machine, and a fluororesin material has been used as the sliding member. However, this method has the problem that the fluororesin material deteriorates due to wear, resulting in a decrease in the performance of the guide mechanism, such as an increase in sliding resistance. The present invention has been made to solve the above-mentioned problems, and has an object to provide a grinding machine in which the performance of the guide mechanism is less likely to deteriorate while suppressing vibration. [Means for solving the problem]

[0005] The grinding machine disclosed in the present invention has a sliding guide mechanism that guides a table supporting a workpiece to be ground in a predetermined direction along a rail-shaped guide member, and includes a fluororesin sheet material that is fixed to the guide member to form a sliding surface, a groove portion provided on the sheet material, and an oil supply port disposed within the groove portion. The guide member has an inclination in the short side direction, and the sheet material is fixed to the guide member in such a manner that the entire sheet material is inclined in accordance with the inclination of the guide member. It is something. According to the disclosure of the present invention, the sheet material fixed to the guide member comes into surface contact with the guided object, which makes it less likely for gaps to occur in the guide mechanism compared to using a ball guide or hollow roller guide that makes point contact with the guided object, and suppresses minute vibrations caused by gaps. In addition, the lubricating oil supplied from the oil supply port can be supplied more efficiently to the sheet material via the groove portion, thereby suppressing deterioration of the sheet material due to wear, and thereby suppressing deterioration in the performance of the guide mechanism. [Brief description of the drawings]

[0006] [Figure 1] 1 is a side view of a grinding machine according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an explanatory view of a sliding state in the grinding machine according to the first embodiment of the present invention. [Diagram 3] 1 is a perspective view of a saddle to which a guide member is fixed in a grinding machine according to a first embodiment of the present invention. FIG. [Figure 4] FIG. 2 is an explanatory diagram of a sheet material in the grinding machine according to the first embodiment of the present invention. [Diagram 5] 3 is an explanatory diagram of a first example of a cross-sectional shape of a groove portion of a sheet material in the grinding machine according to the first embodiment of the present invention. FIG. [Figure 6] 5 is an explanatory diagram of a second example of a cross-sectional shape of a groove portion of a sheet material in the grinding machine according to the first embodiment of the present invention. FIG. [Figure 7] 6 is an explanatory diagram of a third example of a cross-sectional shape of a groove portion of a sheet material in the grinding machine according to the first embodiment of the present invention. FIG. [Figure 8] FIG. 11 is an explanatory diagram of a sheet material in a grinding machine according to a second embodiment of the present invention. [Figure 9] FIG. 11 is an explanatory diagram of a position of an oil supply port in a grinding machine according to a third embodiment of the present invention. [Figure 10] 6A and 6B are explanatory diagrams of a first example of the shape of a groove portion of a sheet material in a grinding machine according to another embodiment of the present invention. [Figure 11] 10 is an explanatory diagram of a second example of the shape of a groove portion of a sheet material in a grinding machine according to another embodiment of the present invention. FIG. [Figure 12] 13 is an explanatory diagram of a third example of the shape of a groove portion of a sheet material in a grinding machine according to another embodiment of the present invention. FIG. [Figure 13] 13 is an explanatory diagram of a fourth example of the shape of a groove portion of a sheet material in a grinding machine according to another embodiment of the present invention. FIG. [Figure 14] 13 is an explanatory diagram of a fifth example of the shape of a groove portion of a sheet material in a grinding machine according to another embodiment of the present invention. FIG. [Figure 15] 5 is an explanatory view of a first example of a sliding mechanism in a grinding machine according to another embodiment of the present invention. FIG. [Figure 16]6 is an explanatory diagram of a second example of a sliding mechanism in a grinding machine according to another embodiment of the present invention. FIG. [Figure 17] 4A to 4C are explanatory diagrams showing grinding results by an embodiment and a comparative example of the grinding machine of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] (First embodiment of the present invention) Hereinafter, an example of an embodiment of the present invention will be described with reference to FIGS.

[0008] [Grinding machine details] FIG. 1 is a side view of an example of a grinding machine 100 according to the present embodiment. The grinding machine 100 comprises a main body base 101 arranged horizontally, a saddle 102 arranged so as to be movable left and right (X direction) in FIG. 1, and a table 103 arranged so as to be capable of reciprocating motion on the saddle 102 in the front-to-back direction in FIG. 1 (Y direction in FIG. 2). The grinding machine 100 also includes two guide members 104 (guide members 104A, 104B) that are fixed to the upper surface of the saddle 102 and are used to guide the table 103. The grinding machine 100 also includes two guided members 105 (guideable members 105A, 105B) that are fixed to the bottom surface of the table 103 and are used to slide along the guide members 104A, 104B.

[0009] In addition, the grinding machine 100, like a known surface grinding machine, is provided with a column fixed on a main body base 101. The column is provided with a drive unit, a grinding spindle head that is rotationally driven via the drive unit, and a holding frame to which the grinding spindle head can be freely attached. In addition, a grinding wheel 106 is attached to the grinding spindle head. In such a grinding machine 100, the saddle 102 is driven to move the workpiece W toward the grinding wheel 106, and the table 103 is caused to slide back and forth, whereby the workpiece W is ground using the grinding wheel 106.

[0010] [Details of the guide mechanism] A guide mechanism that guides table 103 by sliding will be described. Hereinafter, the guide mechanism that guides table 103 will be referred to as a guide mechanism for table 103. The guide mechanism for table 103 includes guide members 104A and 104B fixed to saddle 102, and guided members 105A and 105B fixed to table 103. Fig. 2 shows an example of a state in which the table 103 slides, and Fig. 3 shows a perspective view of the saddle 102 to which the guide members 104A and 104B are fixed.

[0011] Guide member 104A is a rail-shaped member and serves to restrict movement of table 103 in any direction other than a predetermined direction (Y direction). Guide member 104A has a groove with a V-shaped cross section that is continuous in the longitudinal direction. The V-shape is a shape in which a tapered recess (depression) is formed by two inclined line segments facing each other. Guide member 104B is a rail-shaped member with a flat upper portion and serves to bear the load of table 103 and workpiece W. Guide members 104A and 104B are fixed to the upper surface of saddle 102 so that their longitudinal directions are parallel to each other.

[0012] Guided member 105A is a rail-like member with an inverted V-shaped cross section, and has a convex portion with an inverted V-shaped cross section at the bottom, which comes into surface contact with a groove with a V-shaped cross section of guide member 104A. The inverted V-shape is a shape in which a tapered convex portion is formed by two inclined line segments facing each other. Guided member 105B is a rail-like member with a flat bottom, and comes into surface contact with guide member 104B. Guided members 105A and 105B are fixed to the bottom surface of table 103 so that their longitudinal directions are parallel to each other.

[0013] 3, fluororesin sheet materials 130 (130A, 130B, 130C) are fixed to guide members 104 (104A, 104B). The surfaces of the sheet materials 130 (130A, 130B, 130C) fixed to guide members 104 (104A, 104B) come into surface contact with the corresponding guided members 105 (105A, 105B). The surfaces of the sheet materials 130 (130A, 130B, 130C) fixed to guide members 104 (104A, 104B) are sliding surfaces used to guide table 103.

[0014] In the guide member 104A, the two sheet materials 130 (130A, 130B) are fixed to a surface inclined in the short side direction of the guide member 104A. In the guide member 104B, one sheet material 130 (130C) is fixed to the upper surface of the guide member 104B. As shown in FIG. 2, the table 103 is guided in the Y direction along the guide members 104A and 104B via the guided members 105A and 105B.

[0015] The sheet material 130 will be described. In this embodiment, the sheet material 130 is a sheet-shaped fluororesin material mainly composed of polytetrafluoroethylene resin (PTFE). The surface of the sheet material 130 will be described with reference to Fig. 4. Fig. 4 shows a plan view of a portion of the sheet material 130. The sheet material 130 has a groove portion 141 on its surface. In this embodiment, as shown in Fig. 4, the groove portion 141 does not reach any end of the surface of the sheet material 130 in the short side direction, but is provided from any position near one end of the surface of the sheet material 130 in the short side direction to any position near the other end. Here, the vicinity of an end in the short side direction on the surface of the sheet material 130A refers to a region on the surface of the sheet material 130 where the distance in the short side direction from this end is equal to or less than a predetermined threshold value (for example, 3%, 5%, 10%, etc. of the width of the sheet material 130 in the short side direction).

[0016] Since groove 141 does not reach any of the ends in the short side direction on the surface of sheet material 130, the ends of the resin sheet material, which are particularly weak, can be avoided in processing the groove, and the occurrence of processing errors such as unintentional chipping can be suppressed. Also, since groove 141 does not reach the ends in the short side direction and is not open to the side, it is possible to prevent lubricating oil from leaking out of the ends in the short side direction through the groove. Moreover, the groove portion 141 has a width in the short side direction from the vicinity of one end to the vicinity of the other end on the surface of the sheet material 130. This enables the grinding machine 100 to supply the lubricant to the contact area 143 over a wider range in the short side direction of the surface of the sheet material 130 in response to the sliding of the corresponding guided member 105.

[0017] In this embodiment, the groove portion 141 is provided from a position near one end of the sheet material 130 in the short side direction to a position near the other end. However, as another example, the groove portion 141 may be provided such that the position of the start end or the end end is different from the position near the end in the short side direction of the sheet material 130, as long as it includes a position near one end of the sheet material 130 in the short side direction and a position near the other end. Furthermore, the groove portion 141 may be provided so as to reach at least one end of the sheet material 130 in the short side direction, if the usage state is such that the lubricating oil is unlikely to leak out or the usage state is such that the leakage of the lubricating oil is permitted.

[0018] Further, an oil supply port 142 used for supplying lubricating oil is provided in the groove portion 141. A set number of pairs of groove portion 141 and oil supply port 142, which are one or more (for example, one, two, three, four, five, etc.), are present on the surface of the sheet material 130. Hereinafter, the area of ​​the surface of the sheet material 130 other than the groove portion 141 is referred to as a contact area 143 that comes into surface contact with the corresponding guided member 105.

[0019] The groove portion 141 is an area in the sheet material 130, and is provided so as not to include any area that crosses the sheet material 130 in the short side direction. Here, crossing the short side direction of the sheet material 130 means that a predetermined area starting from any position on one end of the sheet material 130 in the short side direction extends in the short side direction to reach the other end, and continues continuously from one end to the other end in the short side direction. That is, any area of ​​the sheet material 130 that crosses the sheet material 130 in the short direction of the sheet material 130 is not occupied by grooves 141 and includes contact areas 143. Therefore, the sheet material 130 can support the corresponding guided member 105 at the contact areas 143 without any gaps in the longitudinal direction. If there is a portion in the longitudinal direction of the guide member 104 where the guided member 105 is not supported by the contact region 143, minute vibrations will occur in that portion, similar to the portion between balls in a ball guide or the portion between rollers in a hollow roller guide. As a result, uneven grinding of the object to be ground may occur. The sheet material 130 of this embodiment supports the corresponding guided member 105 at the contact region 143 at any position in the longitudinal direction, thereby suppressing vibrations and preventing uneven grinding. In addition, as long as the groove portion of the sheet material 130 does not cross the sheet material 130 in the short side direction, i.e., does not continue continuously from one end of the sheet material 130 in the short side direction to the other end, it is acceptable for a portion of the groove portion to be arranged parallel to the short side direction, for example, as shown in Figure 14 described later.

[0020] The lubricating oil supplied from the oil supply port 142 passes through the groove portion 141 and diffuses into the contact area 143 in response to the sliding of the corresponding guided member 105. Then, friction between the corresponding guided member 105 and the contact area 143 of the sheet material 130 is reduced. This allows the grinding machine 100 to make the contact area 143 of the sheet material 130 less susceptible to wear, and suppresses deterioration of the sheet material 130. As a result, the grinding machine 100 can further suppress deterioration in performance of the guide mechanism of the table 103.

[0021] In this embodiment, as shown in Fig. 4, the groove 141 is provided so that its shape in plan view is a straight line oblique to the longitudinal direction of the sheet material 130. The groove 141 is provided so that the inclination angle θ (see Fig. 4) with respect to the longitudinal direction of the sheet material 130 is an acute angle equal to or less than a predetermined threshold value (e.g., 10°, 15°, 30°, etc.). The smaller the inclination angle θ of the groove 141 with respect to the longitudinal direction of the sheet material 130, the wider the range of the groove 141 in the longitudinal direction of the sheet material 130. Therefore, by setting the inclination angle θ to be equal to or less than a predetermined threshold value, the grinding machine 100 can supply lubricant to the contact region 143 over a wider range in response to the sliding of the corresponding guided member 105. However, as another example, the grooves 141 may be provided so that the inclination angle θ with respect to the longitudinal direction of the sheet material 130 is greater than a set threshold value.

[0022] The cross-sectional shape of the groove 141 will be described with reference to Figs. 5 to 7. The groove 141 is provided so that its cross-sectional shape widens from the groove bottom side toward the groove opening side. This allows the grinding machine 100 to more efficiently supply the lubricating oil in the groove 141 to the contact area 143 in response to the sliding of the corresponding guided member 105. As a result, the grinding machine 100 can further suppress deterioration of the sheet material 130 due to wear, thereby further suppressing deterioration in the performance of the guide mechanism of the table 103.

[0023] In this embodiment, the groove portion 141 is provided so as to have a V-shaped cross section as shown in Fig. 5. That is, in this embodiment, the sheet material 130 is provided with the groove portion 141 having a V-shaped cross section. However, as another example, the sheet material 130 may be provided with a groove portion having a cross section of another shape that is divergent from the groove bottom side to the groove opening side. For example, the sheet material 130 may be provided with a groove portion 144 having an arc-shaped cross section as shown in Fig. 6. In this case, an oil supply port 142 is provided in the groove portion 144.

[0024] Further, the sheet material 130 may be provided with a groove portion having a cross section with a different shape from the shape expanding from the groove bottom side to the groove opening side. For example, the sheet material 130 may be provided with a groove portion 145 having a rectangular cross section as shown in FIG. 7. In this case, an oil supply port 142 is provided in the groove portion 145. Further, the sheet material 130 may be provided with a plurality of groove portions having different cross-sectional shapes. In this case, an oil supply port 142 is provided inside each of the plurality of groove portions.

[0025] 4, in this embodiment, the oil supply port 142 is provided at a midpoint in the short-side direction of the sheet material 130. However, as another example, the oil supply port 142 may be provided at a position other than the midpoint in the short-side direction of the sheet material 130.

[0026] [Groove processing method] In this embodiment, the grooves 141 are provided by cutting the surface of the sheet material 130. However, the grooves 141 may be provided by other methods. For example, the grooves 141 may be provided by the following method. The sheet material 130 is a fluororesin material that is more easily deformed than metals and the like, and by pressing the surface, deformation can be applied to the pressed portion according to the pressing force. Therefore, the grooves 141 may be formed by pressing a jig having a shape corresponding to the grooves 141 against the surface of the sheet material 130 fixed to the guide member 104. By using this method, the worker need only press the jig against the sheet material 130, so that the worker does not need to be skilled in surface processing techniques such as cutting and scraping, and the processing time is also shortened, so that the grooves 141 can be formed more easily and in a shorter time. In addition, this method can form the grooves 141 even in the sheet material 130 that has already been fixed to the guide member 104, so that the grooves 141 can be formed without using processing equipment only for forming the grooves 141 during the manufacturing stage of the sheet material 130.

[0027] [summary] As described above, the grinding machine 100 of this embodiment includes the sheet material 130 forming the sliding surface of the guide member 104, the groove portion 141 provided in the sheet material 130, and the oil supply port 142 provided in the groove portion 141. The sheet material 130 is in surface contact with the guided member 150, so that gaps are less likely to occur in the guide mechanism compared to when a ball guide or hollow roller guide that makes point contact with the guided object is used, and minute vibrations caused by the gaps can be suppressed. In addition, the grinding machine 100 can more efficiently supply the lubricating oil supplied from the oil supply port 142 to the contact area 143 of the sheet material 130 via the groove portion 141. As a result, the grinding machine 100 can suppress deterioration due to wear of the sheet material 130, and as a result, can suppress performance degradation of the guide mechanism of the table 103 using the sheet material 130. Moreover, the groove portion 141 is provided in a region of the sheet material 130 so as not to include any region that crosses the sheet material 130 in the short direction. Therefore, the grinding machine 100 can support the corresponding guided member 105 in the contact region 143 without any gaps in the longitudinal direction of the sheet material 130, and the occurrence of vibration can be further suppressed.

[0028] Furthermore, when grinding the workpiece W using the grinding machine 100 of this embodiment, the table 103 supporting the workpiece W is guided on the sheet material 130. When the table 103 is guided on the sheet material 130, the grinding machine 100 supplies lubricating oil from the oil supply port 142 to the groove portion 141, and the lubricating oil is supplied from the groove portion 141 to the contact area 143 while grinding the workpiece W. As a result, the grinding machine 100 can grind the workpiece W while suppressing vibration of the table 103, making it difficult for uneven grinding of the workpiece W to occur, and further suppressing deterioration in performance of the guide mechanism of the table 103.

[0029] (Second embodiment of the present invention) In the grinding machine 200 according to this embodiment, a recess (depression) is provided in the contact area of ​​each sheet material forming the sliding surface. In the grinding machine 200 according to this embodiment, elements similar to the elements 101-106, 130, and 141-143 of the grinding machine 100 will be described as elements 201-206, 230, and 241-243. The grinding machine 200 of this embodiment is similar to the grinding machine 100 of the first embodiment, except that the contact area 243 of the sheet material 230 has a recess.

[0030] The sheet material 230 of this embodiment will be described with reference to Fig. 8. The sheet material 230 of this embodiment has one or more recesses 280 provided on a contact region 243 different from the grooves 241. The lubricating oil supplied from the oil supply port 242 to the groove 241 is supplied from the groove 241 to the contact area 243 in response to the sliding of the corresponding guided member 205. Then, a part of the lubricating oil supplied to the contact area 243 is accumulated in the recess 280. As a result, an oil film thicker than that in the surrounding area is formed in the recess 280. This oil film further reduces friction between the sheet material 230 and the corresponding guided member 205. As a result, the grinding machine 200 can further suppress deterioration due to wear of the sheet material 230, thereby further suppressing deterioration of the performance of the guide mechanism. In addition, the recess 280 can supply the lubricating oil accumulated therein to the surrounding contact area 243 in response to the sliding of the table 203.

[0031] In this embodiment, the recess 280 is a recess having a circular shape in a plan view, as shown in Fig. 8. However, as another example, the recess 280 may be a recess having another shape. For example, the recess 280 may be a recess having a rectangular shape in a plan view. Also, the recess 280 may be a recess having a triangular shape in a plan view. Also, the recess 280 may be a recess having an elliptical shape in a plan view.

[0032] The sheet material 230 is a fluororesin material, and by pressing the surface, deformation can be applied to the pressed portion according to the pressing. Therefore, in this embodiment, the recess 280 is provided by a method of pressing a jig (e.g., a metallic spherical jig) corresponding to the shape of the recess 280 onto the surface of the sheet material 230 forming the sliding surface of the guide member 204. By using this method, the worker only needs to press the jig onto the sheet material 230, so that no skill in surface processing is required, and the processing time is shortened, and the recess 280 can be provided more easily and in a shorter time. In addition, this method provides the recess 280 on the sheet material 230 already fixed to the guide member 204, so that the recess 280 can be provided without requiring processing equipment only for providing the recess 280 during the manufacturing stage of the sheet material 230.

[0033] As described above, with the configuration of this embodiment, the grinding machine 200 can further suppress the deterioration of the performance of the guide mechanism of the table 203.

[0034] (Third embodiment of the present invention) The position of the oil supply port of the grinding machine 300 according to this embodiment is different from that of embodiment 1. In the grinding machine 300 of this embodiment, elements similar to the elements 101-106, 130, and 141-143 of the grinding machine 100 will be described as elements 301-306, 330, and 341-343. The grinding machine 300 of this embodiment is similar to the grinding machine 100 of the first embodiment, except for the position of the oil supply port 342. However, the grinding machine 300 of this embodiment may be similar to the grinding machine 200 of the second embodiment, except for the position of the oil supply port 342.

[0035] The sheet materials 330A and 330B of this embodiment have a slant in the short side direction along the surface of the guide member that is inclined in the short side direction, similar to the sheet materials 130A and 130B shown in FIG. 3. In this way, when the sheet material 330 has a slant, the lubricating oil supplied from the oil supply port 342 is more likely to move downward due to gravity. Therefore, in this embodiment, the oil supply port 342 is provided at a position higher than the middle of the groove portion 341 of the sheet material 330 that has a slant in the short side direction. Thereby, the lubricating oil supplied from the oil supply port 342 spreads to the groove portion 341 more efficiently. Then, in response to the sliding of the guided member 305, the lubricating oil is more efficiently supplied from the groove portion 341 to the contact area 343. As a result, deterioration of the sheet material 330 is more suppressed, and the performance degradation of the guide mechanism of the table 103 is more suppressed.

[0036] The position of the oil supply port 342 provided in the groove portion 341 of the sheet material 330A will be described with reference to Fig. 9. The dashed line parallel to the longitudinal direction of the sheet material 330A shown in Fig. 9 indicates the middle of the height direction of the sheet material 330A. The oil supply port 342 is provided at the highest position where the oil supply port 342 can be provided among positions higher than this dashed line. However, as another example, the oil supply port 342 may be provided at a position different from the highest position where the oil supply port 342 can be provided, so long as the position is higher than the dashed line.

[0037] As described above, with the configuration of this embodiment, the grinding machine 300 can more efficiently spread the lubricating oil through the oil supply port 342 to the groove portion 341 of the sheet material 330 that forms an inclined sliding surface. The grinding machine 300 can more efficiently supply the lubricating oil to the contact area 343 of the sheet material 330. As a result, the grinding machine 300 can more efficiently suppress deterioration of the sheet material 330 due to wear, thereby more efficiently suppressing deterioration in the performance of the guide mechanism of the table 303.

[0038] (Fourth embodiment of the present invention) The grinding machine 400 according to this embodiment has a structure in which the sheet material forming the sliding surface of the guide mechanism is made of PTFE mixed with a lubricating filler and an abrasion-resistant filler. In the grinding machine 400 according to this embodiment, elements similar to the elements 101-106, 130, and 141-143 of the grinding machine 100 are described as elements 401-406, 430, and 441-443. The grinding machine 400 of this embodiment is similar to the grinding machine 100 of embodiment 1, except for the composition of the sheet material 430. However, the grinding machine 400 of this embodiment may be similar to the grinding machine 200 of embodiment 2 or the grinding machine 300 of embodiment 3, except for the composition of the sheet material 430.

[0039] The sheet material 430 of this embodiment is a sheet-shaped fluororesin material that contains a lubricating filler and an abrasion-resistant filler. More specifically, the sheet material 430 is a sheet-shaped fluororesin material that contains 50 wt% to 85 wt% of PTFE, 5 wt% to 50 wt% of polyethersulfone, 2 wt% to 15 wt% of one or more of carbon, graphite, and molybdenum disulfide as a lubricating filler filled in the PTFE, and 5 wt% to 30 wt% of one of potassium titanate, wollastonite, xonotlite, and aramid fiber as an abrasion-resistant filler filled in the PTFE. In this manner, by using sheet material 430 in which a lubricating filler and an abrasion-resistant filler are mixed, the wear between sheet material 430 and guided member 405 can be further reduced.

[0040] In this embodiment, the sheet material 430 is a fluororesin material obtained by blending a lubricating filler and an abrasion-resistant filler with PTFE, as described above. However, as another example, the sheet material 430 may be a fluororesin material obtained by blending another lubricating filler and another abrasion-resistant filler with PTFE. Moreover, the sheet material 430 may be a fluororesin material obtained by blending only one of the lubricating filler and the abrasion-resistant filler.

[0041] With the configuration of this embodiment, the grinding machine 400 can further reduce wear of the sheet material 430 and further suppress deterioration in the performance of the guide mechanism of the table 403.

[0042] <Other embodiments> In the grinding machine 500 of this embodiment, elements similar to the elements 101-106, 130, and 141-143 of the grinding machine 100 will be referred to as elements 501-506, 530, and 541-543.

[0043] In the first to fourth embodiments, the sheet material forming the sliding surface is provided with grooves that have a linear shape oblique to the longitudinal direction of the sheet material in a plan view. However, the sheet material forming the sliding surface may be provided with grooves that have other shapes in a plan view. For example, the sheet material 530 may be provided with a groove 544 having a V-shape in a plan view, as shown in Fig. 10. In this case, the oil supply port 542 is provided in the groove 544.

[0044] Groove 544 can more efficiently supply lubricating oil to contact region 543 when corresponding guided member 505 slides on groove 544 in the direction indicated by the tip of the V shape (downward direction in FIG. 10). As a result, groove 544 can more effectively suppress deterioration of sheet material 530 due to wear, thereby more effectively suppressing deterioration in performance of the guide mechanism of table 503.

[0045] Moreover, when the sheet material 530 has a plurality of grooves 544, each groove 544 may be provided as follows. That is, some of the grooves 544 may be provided in the same shape as in FIG. 10, and the other grooves 541 may be provided in a V-shape in a plan view that is the opposite to that in FIG. 10. An example of the grooves 544 thus provided is shown in FIG. 11. In this case, the grooves 544 provided in the same shape as in FIG. 10 can more efficiently supply lubricating oil to the contact region 543 when the corresponding guided member 505 slides on the grooves 544 in the direction indicated by the tip of the V-shape (the downward direction in FIG. 11). As a result, the grooves 544 can more effectively suppress deterioration of the sheet material 530 due to wear, thereby more effectively suppressing deterioration in the performance of the guide mechanism of the table 503. 10, the lubricating oil can be more efficiently supplied to the contact area 543 when the corresponding guided member 505 slides on the groove 544 in the direction indicated by the tip of the V shape (the upward direction in FIG. 11). As a result, the groove 544 can more effectively suppress deterioration of the sheet material 530 due to wear, thereby more effectively suppressing deterioration in the performance of the guide mechanism of the table 503.

[0046] Furthermore, the sheet material 530 may be provided with a groove 545 that has an X-shape in plan view formed by combining two V-shapes facing inversely to each other, as shown in Fig. 12. In this case, an oil supply port 542 is provided in the groove 545. Groove portion 545 can more efficiently supply lubricating oil to contact region 543 when corresponding guided member 505 slides on groove portion 545 in any sliding direction. As a result, groove portion 545 can more effectively suppress deterioration of sheet material 530 due to wear, and can more effectively suppress deterioration of the performance of the guide mechanism of table 503. 13, the sheet material 530 may be provided with grooves 546 that are wavy in plan view. In this case, the oil supply port 542 is provided in the grooves 546.

[0047] Furthermore, the sheet material 530 may be provided with a groove 547 having a square wave or rectangular wave shape in a plan view as shown in Fig. 14. In this case, an oil supply port 542 is provided in the groove 547. Furthermore, in the example of Fig. 14, two oil supply ports 542 are provided in the groove 547. In this way, by providing a plurality of oil supply ports 542 in one groove 547, it is possible to easily spread the lubricating oil over the entire long groove, and the lubricating oil can be supplied from one groove 547 so as to cover the contact area 543 on the sheet material. Furthermore, the sheet material 530 may be provided with a plurality of grooves having different shapes in a plan view.

[0048] In the first to fourth embodiments, the sliding surface of each guide member 504 of the guide mechanism of the table 503 is made of the fluororesin sheet material 530 fixed to the guide member 504. However, as another example, the sliding surfaces of only some of the guide members 504 may be made of the sheet material 530. For example, in the case where guide member 504A and guide member 504B are fixed to saddle 502 as in embodiment 1, sheet material 530 forming a sliding surface may be fixed to only one of guide member 504A and guide member 504B.

[0049] In embodiments 1 to 4 and other embodiments, the guide mechanism of the table 503 (103, 203, 303, 403) in the grinding machine 500 (100, 200, 300, 400) is configured to include two guide members 504 (104, 204, 304, 404) fixed to the saddle 502 (102, 202, 302, 402) and two guided members 505 (105, 205, 305, 405) fixed to the table 503 (103, 203, 303, 403). However, as another example, the guide mechanism of table 503 may have a different configuration from this configuration. For example, the guide mechanism of table 503 may include one guide member 504 fixed to saddle 502 as a guide member used for sliding. In that case, table 503 comes into contact with one guide member 504 at a sliding surface made of sheet material 530 via one guided member 505 fixed to the bottom surface of table 503, and slides along this one guide member 504.

[0050] The guide mechanism for table 503 may include three or more guide members 504 fixed to saddle 502 as guide members used for sliding of table 503. In this case, table 503 comes into contact with the three or more guide members fixed to saddle 502 at sliding surfaces made of sheet material 530, for example, via three guided members 505 fixed to the bottom surface, and slides along these three or more guide members 504.

[0051] Further, the guide mechanism of the table 503 may include a guide member 504C having an inverted V-shaped cross section shown in FIG. 15, instead of the guide member 504A similar to the guide member 104A of the first embodiment. In this case, table 503 includes, for example, guided member 505C having a V-shaped cross section as shown in Fig. 15, as guided member 505 corresponding to guide member 504C. The sliding surface of guide member 504C is made of sheet materials 530D, E fixed onto two surfaces forming a mountain shape in guide member 504C. Each of sheet materials 530D, E is provided with groove portion 541, and oil supply port 542 is provided in groove portion 541.

[0052] Further, the guide mechanism for table 503 may include guide members 504D and 504E and a guided member 505D shown in FIG. 16, instead of the two guide members and two guided members similar to those in the first embodiment. Guide members 504D and 504E each have an L-shaped cross section perpendicular to the sliding direction, are planar members with horizontal upper surfaces, and are fixed to the upper surface of saddle 502. Guided member 505D is a member that comes into contact with guide members 504D and 504E at the sliding surfaces, and is fixed to the bottom surface of table 503. In this case, sliding surfaces are formed on the upper surfaces of guide members 504D and 504E. That is, sheet materials 530F and G forming the sliding surfaces are fixed to the upper surfaces of guide members 504D and 504E, respectively.

[0053] Each of the sheet materials 530F,G is provided with a groove 541, and an oil supply port 542 is provided in the groove 541. In the example of Fig. 16, the guide member 504E restrains the movement of the guided member 505D in the short side direction, and serves to limit the movement of the table 503 to only the long side direction of the guide member 504E. In addition, the guide member 504D does not completely restrain the movement of the guided member 505D in the short side direction, and serves to mainly bear the load of the table 503 and the workpiece W.

[0054] Although an example of an embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment. For example, the above-described embodiments may be arbitrarily combined. EXAMPLES

[0055] The inventors performed grinding on the surface of a steel material using the grinding machine 100 of the present invention described in the first embodiment. Then, the inventors performed finish polishing on the surface of the steel material after grinding using an oil stone. As comparative examples, the inventors also performed similar grinding and post-processing polishing operations using a grinding machine that uses a ball guide in the guide mechanism of the table that supports the workpiece, and a grinding machine that uses a hollow roller guide.

[0056] The results are shown in Figure 17. Figure 17(a) shows the surface of the steel material after finish polishing when the grinding machine 100 of the present invention is used. Figure 17(b) shows the surface of the steel material after finish polishing when a grinding machine using a ball guide for the table guide mechanism is used. Figure 17(c) shows the surface of the steel material after finish polishing when a grinding machine using a ball guide for the table guide mechanism is used. Fig. 17(a) shows that the surface is smooth and no grinding unevenness occurs. In contrast, Fig. 17(b) and (c) show that a mesh-like pattern occurs due to grinding unevenness. From the above, it was verified that the grinding machine 100 of the present invention can suppress the generation of vibration. [Explanation of symbols]

[0057] 100 Grinding Machine 101 Body base 102 Saddle 103 Table 104 Guide member 105 Guided member 106 Grindstone 130 Sheet material 141 Groove 142 Oil supply port 143 Contact area 144 Groove 145 Groove 200 Grinding Machine 203 Table 204 Guide member 205 Guided member 230 Sheet material 241 Groove 242 Oil supply port 243 Contact area 280 Recess 300 Grinding Machine 330 Sheet material 341 Groove 342 Oil supply port 343 Contact area 400 Grinding Machine 403 Table 405 Guided member 430 Sheet material 500 Grinding Machine 503 Table 504 Guide member 505 Guided member 530 Sheet material 541 Groove 542 Oil supply port 543 Contact area 544 Groove 545 Groove 546 Groove 547 Groove

Claims

1. A grinding machine having a sliding guide mechanism that guides a table supporting a workpiece to be ground in a predetermined direction along a rail-shaped guide member, A fluororesin sheet material that is fixed to the guide member and forms a sliding surface; A groove portion provided on the sheet material; an oil supply port provided in the groove; Equipped with The guide member has an inclination in a short side direction, The sheet material is fixed to the guide member in such a manner that the entire sheet material is inclined in accordance with the inclination of the guide member, The oil supply port is provided at a position equal to or higher than the middle height of the sheet material. The grinding machine features:

2. In the grinding machine according to claim 1, The sheet material is provided over the entire length of the guide member in the longitudinal direction, The groove portion does not include an area that crosses the sheet material in the short direction of the sheet material. The grinding machine features:

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