Polishing brush

Abstract

To provide a polishing brush that can polish an object having convex, concave and flat surfaces.SOLUTION: A number of rotatable brushes 1 are disposed along a length direction of one outer periphery of a core bar of which outer peripheries have a curved surface shape that has a constant curvature and a number of rotatable brushes 2 are disposed along a length direction of the other outer periphery of the core bar in a 180° opposite direction to a position where the brushes 1 are disposed, where the core bar is rotatable about an axis.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an abrasive brush, and in particular to an abrasive brush capable of abrading objects having convex, concave and planar surfaces. [Background technology]

[0002] As an example of this type of device, Patent Document 1 discloses a rotary cylindrical abrasive brush as shown in FIG. 15. In FIG. 15, 91 denotes a rotating shaft, and a cylindrical abrasive brush 92 is attached to this rotating shaft 91. Furthermore, this cylindrical abrasive brush 92 includes a cylindrical core tube 95 consisting of a cylindrical base 93 and an outer tube 94, a brush group 97 consisting of brush bundles planted in brush planting holes 96 drilled in the outer tube 94, and a fastener 98 consisting of a bolt and nut for fixing the cylindrical core tube 95 to the rotating shaft 91. The cylindrical core tube 95 is split in half, and the cylindrical base 93 and the outer tube 94 are also split in half. The cylindrical base 93 is cylindrical, consisting of thick portions 99 at both ends and a thin portion 100 in the middle. The outer tube 94 is a right cylinder having a predetermined thickness, has the same length as the cylindrical base 93, and its inner diameter coincides with the outer diameter of the cylindrical base 93. It is fitted closely to the outside of the cylindrical base 93 and is fixed integrally to the cylindrical base 93. The brush implantation holes 96 are circular in cross section and drilled to a certain depth in the outer tube 94, and a large number of them are drilled at regular intervals around the outer periphery of the outer tube 94. The brush group 97 is implanted in each brush implantation hole 96 with each brush bundle 101. The fixing device 98 is made of a bolt 102 and a nut 103, and fixes the cylindrical core tube 95 to the rotating shaft 91. The abrasive brush described in Patent Document 1 can polish the inner surface of a cylindrical object.

[0003] Patent Document 2 also describes a self-watering abrasive segment-type heavy-duty abrasive brush roll as shown in Fig. 16(a)(b). In Fig. 16(a)(b), an abrasive segment 112 of an abrasive brush roll 111 includes an abrasive member 113 and a fan-shaped board 114 as components. The abrasive member 113 includes a rod-shaped abrasive tip 115 in which an abrasive is solidified with a resin binder, a metal sleeve 116 to which the base end of the abrasive tip 115 is joined to the tip end, and an elastic rod 117 made of a resin-processed fiber string, the base end of which is joined to the tip end of the metal sleeve 116 and fixed to the outer periphery of the fan-shaped board 114 as components. A cover 118 is fixed to the metal sleeve 116. In the abrasive segment 112, a plurality of fan-shaped boards 114 are arranged in a circle around the axis of a shaft 119, and are attached to the outer periphery of the shaft 119 so that a large number of fan-shaped boards 114 are arranged adjacent to each other along the length of the shaft 119. The sector board 114 has an inverted T-shaped dovetail key 121 for keying the sector board 114 to an inverted T-shaped dovetail keyway 120 provided at a fixed position on the outer circumferential surface of the shaft 119. The outer circumferential surface of the shaft 119 has a water outlet 122. The water outlet 122 is a slit formed in the bottom of the keyway 120 along the length of the keyway 120 and leads to a pressurized water supply source such as a water pump. The slit that is the water outlet 122 is provided with a channel-type water duct 124 extending along the length of the water passage groove 123 formed in the bottom of the keyway 120 in the length direction of the groove. In addition, a water passage groove 125 is formed to open in the radial direction of the shaft 119. The polishing member 113 configured in this manner is implanted in a cylindrical shape along the axial direction of the shaft 119 shown in FIG. 16(b). The polishing brush described in Patent Document 2 can also polish the inner surface of a cylindrical object.

[0004] Furthermore, Patent Document 3 describes a rotating abrasive brush as shown in Fig. 17(a)(b). In Fig. 17(a), 131 denotes an abrasive brush having a rotatable disk-shaped main body 132, and a spindle 133 at the upper end of the main body 132 is inserted and supported by a bearing member 134, so that the brush is suspended. 135 denotes a drive motor attached to a guide body 136 together with the bearing member 134, and rotates the spindle 133. 137 denotes a cooling water supply pipe, and 138 denotes a rotary seal. The guide body 136 can be raised and lowered along a guide screw shaft 141 rotatably provided on a column 139 by a drive motor 140, and this raising and lowering allows the abrasive brush 131 to come into contact with and separate from the surface of a workpiece W on a workbench 142 arranged below the guide body 136. The main body 132 is composed of a base end block 143, an intermediate block 144, and a tip block 145 shown in Fig. 17(b). The brush block 146 has the bases of a number of brushes 147 bundled in a cylindrical shape inserted into a cylindrical body 148 and fixed thereto, and a rod-shaped stopper 149 is provided on the outer circumferential surface of the cylindrical body 148, penetrating the inside of the cylindrical body 148, and the rod-shaped stopper 149 is slidably engaged with a groove 151 formed in a large-diameter tip portion 150 of the intermediate block 144. Reference numeral 152 denotes an adhesive for fixing the base of the brush block 146 to the cylindrical body 148. A small brush block 153 is inserted and fixed in the intermediate block 144 with its trim T2 being shorter than the trim T1 of the brush block 146. In this configuration, the spindle 133 is rotated at a predetermined speed by the drive motor 135, and the polishing brush 131 rotated with the rotation of the spindle 133 is lowered by the drive motor 140, and the tip of the brush block 146 hits the surface of the workpiece W on the work table 142 on which burrs are formed, and polishing begins. When excessive pressure is applied by the abutment of the tip of brush block 146, the brush instantaneously retreats against the elastic force of cushion tube 154, and polishing becomes stable at a position where the tip of brush block 146 almost coincides with the tip of small brush block 153. The polishing brush described in Patent Document 3 is capable of polishing objects on a flat plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-99481 [Patent Document 2] Japanese Utility Model Application Publication No. 5-63762 [Patent Document 3] Japanese Patent Application Publication No. 8-187667 Summary of the Invention [Problem to be solved by the invention]

[0006] The abrasive brush described in Patent Document 1 can polish the inner surface of a cylindrical object, the abrasive brush described in Patent Document 2 can also polish the inner surface of a cylindrical object, and the abrasive brush described in Patent Document 3 can polish a flat object. As described above, conventional abrasive brushes can only polish cylindrical objects or flat objects. Therefore, the object of the present invention is to provide an abrasive brush that can polish objects having convex, concave, and flat surfaces. [Means for solving the problem]

[0007] The present inventors have conducted extensive research to solve the above problems, and have found that the object can be achieved by arranging a number of rotatable brushes on a core having a curved outer periphery and rotating the core around an axis. In other words, the abrasive brush of the present invention is characterized in that a number of rotatable brushes 1 are arranged along the length of one outer periphery of a core bar, the outer periphery of which is curved with a constant curvature, and a number of rotatable brushes 2 are arranged along the length of the other outer periphery of the core bar, which is 180° opposite to the position where brush 1 is arranged, and the core bar is rotatable around its axis. Effect of the Invention

[0008] The abrasive brush of the present invention can polish an object having a surface that matches the curved surface of the core by rotating a number of rotatable brushes 1 arranged along the length of one outer periphery of the core, and then can polish an object having a surface that matches the curved surface of the core by rotating the core around its axis and rotating a number of rotatable brushes 2 arranged along the length of the other outer periphery of the core, which is 180° opposite to the position where brushes 1 are arranged. Therefore, by arranging an object having a convex, concave or flat surface along the curved surface of the core of the abrasive brush of the present invention, the object can be polished. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a front view showing an embodiment in which an example of the polishing brush of the present invention is installed in a polishing device. [Diagram 2] FIG. 2 is a front view showing another embodiment in which an example of the abrasive brush of the present invention is installed in a polishing device. [Diagram 3] 3(a), (b), and (c) are schematic diagrams illustrating a state in which an object to be polished is polished by the abrasive brush of the present invention. [Figure 4] FIG. 4 is a front view showing one embodiment in which an object to be polished is polished with an example of the polishing brush of the present invention installed in a polishing device. [Diagram 5] FIG. 5 is a front view showing another embodiment in which an object to be polished is polished with an example of the polishing brush of the present invention installed in a polishing device. [Figure 6] FIG. 6 is a schematic diagram showing a position adjustment mechanism that constitutes the polishing apparatus and that moves a member to be polished in the forward and backward directions. [Figure 7]Figure 7(a) is a schematic diagram of a first embodiment showing the state before the wire assembly used in the abrasive brush of the present invention is attached to a brush holder, Figure 7(b) is a schematic diagram of the first embodiment showing the state after the wire holder of the wire assembly of Figure 7(a) has been inserted into the retaining hole of the brush holder, and Figure 7(c) is a schematic diagram of the first embodiment showing the state after the wire holder of the wire assembly of Figure 7(a) has been fixed to the retaining hole by a set screw. [Figure 8] FIG. 8 is a schematic diagram of a second embodiment of the wire assembly used in the abrasive brush of the present invention, showing a state in which the wire holder is fixed in a holding hole by a set screw. [Figure 9] FIG. 9(a) is a front view showing a first embodiment of bristle material for an abrasive brush used in an abrasive brush of the present invention, and FIG. 9(b) is a cross-sectional view taken along line AA in FIG. 9(a). [Figure 10] FIG. 10(a) is a front view showing a second embodiment of the bristle material for an abrasive brush used in the abrasive brush of the present invention, and FIG. 10(b) is a cross-sectional view taken along line AA in FIG. 10(a). [Figure 11] FIG. 11 is a schematic diagram showing an example of the shape of a cross section perpendicular to the length direction of a third embodiment of bristles for an abrasive brush used in an abrasive brush of the present invention. [Figure 12] FIG. 12 is a schematic diagram showing an example of the shape of a side cross section of a third embodiment of bristles for an abrasive brush used in an abrasive brush of the present invention. [Figure 13] FIG. 13(a) is a front view showing a fourth embodiment of the bristle material for an abrasive brush used in the abrasive brush of the present invention, and FIG. 13(b) is a cross-sectional view taken along the line AA in FIG. 13(a). [Figure 14] FIG. 14(a) is a front view showing a fifth embodiment of the bristle material for an abrasive brush used in the abrasive brush of the present invention, and FIG. 14(b) is a cross-sectional view taken along line AA in FIG. 14(a). [Figure 15] FIG. 15 is a vertical sectional view showing the overall configuration of the polishing brush described in Patent Document 1. [Figure 16] FIG. 16(a) is a front view showing the abrasive segment described in Patent Document 2, and FIG. 16(b) is a front view showing the abrasive brush roll. [Figure 17]FIG. 17(a) is a front view showing the entire brush device to which the abrasive brush described in Patent Document 3 is attached, and FIG. 17(b) is an enlarged front view of the left half of the abrasive brush described in Patent Document 3. [Figure 18] FIG. 18 is a schematic diagram showing the state in which the upper part of the brush-like grindstone is inserted and fixed inside the brush case in the polisher brush described in WO 2004 / 009293. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, an embodiment of the abrasive brush of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an embodiment in which an example of the abrasive brush of the present invention is installed in an abrasive device. In FIG. 1, 1 is a core metal having a curved outer periphery with a constant curvature, and a boundary line 2a connecting the top of the core metal 1 and a boundary line 2b connecting the bottom of the core metal 1, which is 180° opposite to the boundary line 2a, both protrude upward from the horizontal line. Rotatable brushes 3a, 3b, 3c, ... are arranged from one end of the core metal 1 to the other end along the boundary line 2a. Each brush 3a, 3b, 3c, ... consists of a base part 4 and abrasive brush bristles 5. Each base part 4 has a built-in motor, which can rotate the abrasive brush bristles 5, and the motor is connected to a power source not shown. Rotatable brushes 6a, 6b, 6c, ... are arranged from one end of the core metal 1 to the other end along the boundary line 2b. Each of the brushes 6a, 6b, 6c, ... consists of a base portion 7 and abrasive brush bristles 8. A motor is built into each of the base portions 7, and the abrasive brush bristles 8 can be rotated by this motor, and the motor is connected to a power source (not shown).

[0011] A motor 10 is mounted on the left base frame 9, and a motor 12 is mounted on the right base frame 11. The motor 10 is connected to the left end of the core bar 1 via a connecting member 13, a universal joint 14, and a connecting member 15. The motor 12 is connected to the right end of the core bar 1 via a connecting member 16, a universal joint 17, and a connecting member 18. By starting the motors 10 and 12, the core bar 1 in FIG. 1 can be rotated 180° to the state shown in FIG. 2.

[0012] In Fig. 1, a screw-type lift table 20 using a trapezoidal screw is installed on a base 19. The lift table 20 can be raised and lowered by rotating a handle 21. Position adjustment mechanisms A and B, which will be described later, for moving the member to be polished in the front-rear direction are arranged on a table 22 of the lift table 20. Reference numerals 23a and 23b denote left and right support columns of the polishing apparatus, and reference numeral 24 denotes a beam connecting the support columns 23a and 23b.

[0013] FIG. 6 is a schematic diagram showing a position adjustment mechanism that constitutes the polishing apparatus and moves the member to be polished in the forward and backward directions. In FIG. 6, a slide block 25 and a stand 26 are screwed to a feed screw shaft 27. The stand 26 is fixed to the table 22 of the lift table 20. A linear guide 28 that is the base of the slide block 25 can slide on a guide bar 29 fixed to the table 22. When the handle 30 is turned leftward, the feed screw shaft 27 moves leftward by the screw pitch. Since the slide block 25 is prevented from rotating by the linear guide 28 that is fitted to the guide bar 29, the slide block 25 tries to move rightward by the screw pitch of the slide block 25, which is opposite to the moving direction of the feed screw shaft 27. The thread of the feed screw shaft 27 where the slide block 25 is screwed is finer than the thread of the feed screw shaft 27 where the stand 26 is screwed, so that as a result of the relative motion between the feed screw shaft 27 and the slide block 25, the slide block 25 moves leftward on the guide bar 29 together with the linear guide 28 by the difference in the thread pitch. In this way, precise position adjustment is possible. On the other hand, when the handle 30 is rotated rightward, the slide block 25 moves rightward on the guide bar 29 together with the linear guide 28 by the difference in the left and right thread pitch due to the same action as above. Position adjustment mechanisms A and B having the above-mentioned structure are arranged on the left and right of the polishing apparatus.

[0014] Figures 3(a), (b), and (c) are schematic diagrams for explaining the state in which an object to be polished is polished by the polishing brush of the present invention. In Figure 3(a), 31 is an object to be polished that is curved upwardly concavely, in Figure 3(b), 32 is an object to be polished that is curved upwardly convexly, and in Figure 3(c), 33 is a flat object to be polished.

[0015] Now, when polishing an object 32 to be polished that is curved upwardly in a convex shape as shown in Fig. 3(b), as shown in Fig. 4, the object 32 to be polished is placed on a plate 34 connecting the guide bars 29 of the position adjustment mechanisms A and B arranged on the left and right of the polishing apparatus, and the handle 21 of the lift table 20 is rotated to raise the table 22, thereby moving the object 32 to an appropriate position. Next, the abrasive brush bristles 8 are rotated by a motor built into the base portion 7 of the brushes 6a, 6b, 6c, ..., to polish the object 32 to be polished. Then, the object 32 to be polished is moved forward and backward by the left and right position adjustment mechanisms A and B, so that the entire surface of the object 32 to be polished can be polished.

[0016] 3(a), the object 31 is placed on a plate 34 connecting the guide bars 29 of the position adjustment mechanisms A and B arranged on the left and right of the polishing apparatus, and the handle 21 of the lift table 20 is rotated to raise the table 22, thereby moving the object 31 to an appropriate position. Next, the brush bristles 5 are rotated by a motor built into the base portion 4 of the brushes 3a, 3b, 3c, ..., to polish the object 31. Then, the object 31 is moved forward and backward by the left and right position adjustment mechanisms A and B, so that the entire surface of the object 31 can be polished.

[0017] When polishing a flat object 33 to be polished as shown in Fig. 3(c), it can be polished in the same manner as when polishing an upwardly concavely curved object 31 to be polished as shown in Fig. 3(a). However, in order to polish the entire surface of the flat object 33 to be polished, it is necessary to move the object 33 to the left and right as appropriate on a plate 34 connecting the guide bars 29 of the position adjustment mechanisms A and B arranged on the left and right of the polishing apparatus.

[0018] As for brush-like grindstones used in polishing brushes, those using wires made of inorganic long fibers such as alumina long fibers bound with a resin binder, and those using wires made of brass, nylon, etc., have been proposed, and in these brush-like grindstones, the ends of the bundles of wires are fixed to each of a plurality of holes in a brush holder with an adhesive. For example, WO 2004 / 009293 proposes such a brush-like grindstone, as shown in FIG. 18, which is composed of a cylindrical metal brush case 163 having a drive connecting shaft 162 on the top of a polishing machine brush 161, a brush-like grindstone 164 with its top inserted into the brush case 163, and screws 165 and 166 for fixing the brush-like grindstone 164 to a predetermined position in the brush case 163.

[0019] In order to efficiently polish a wide area of ​​a workpiece using the brush-like grindstone and abrasive brush described in WO 2004 / 009293, it is necessary to increase the diameter of the brush case and provide many bundles of wire over a wide area of ​​the brush case. On the other hand, the brush-like grindstone described in WO 2004 / 009293 uses an aggregate of inorganic long fibers such as alumina long fibers as the wire, and unlike wires such as nylon, the wires may break in some of the bundles. In such a case, the entire brush-like grindstone is replaced and the replaced brush-like grindstone is discarded. However, the large-diameter brush-like grindstone is expensive because it has many bundles of wire and the brush case is large-diameter. Therefore, if the brush-like grindstone is replaced every time a part of the bundle of wire breaks, the maintenance cost will increase.

[0020] In addition, when the wire fixed to the brush case by the adhesive wears, the entire brush-like grindstone must be discarded and replaced, which is problematic in terms of cost and resource saving. Furthermore, even if it becomes necessary to change the type of wire attached to the brush case or the number of bundles of wire depending on the type of workpiece to be polished, the brush-like grindstone described in International Publication No. 2004 / 009293 cannot change the type of wire or the number of bundles of wire because the bundles of wire are fixed to the brush case by the adhesive. For this reason, it is necessary to prepare multiple types of brush-like grindstones corresponding to the types of workpieces to be polished, but since large-diameter brush-like grindstones are expensive, there is a problem that the cost increases further.

[0021] Therefore, it is preferable to provide a brush-like grindstone that can reduce the cost of the grinding process. Fig. 7(a) is a schematic diagram of a first embodiment showing a state before the wire aggregate used in the grinding brush of the present invention is attached to a brush holder, Fig. 7(b) is a schematic diagram of the first embodiment showing a state in which the wire holder of the wire aggregate of Fig. 7(a) is inserted into a holding hole of the brush holder, and Fig. 7(c) is a schematic diagram of the first embodiment showing a state in which the wire holder of the wire aggregate of Fig. 7(a) is fixed to the holding hole by a set screw. As shown in Figs. 7(a), (b), and (c), in a brush-like grindstone 42 having a plurality of wires 41 in which an aggregate thread of inorganic long fibers such as alumina long fibers is solidified with a resin binder, the bundle of the plurality of wires 41 is held by a brush holder 43, and the free ends (tips) of the wires 41 are used to grind a workpiece (abrasive target).

[0022] The wire 41 is formed into a wire by impregnating an aggregate of inorganic long fibers such as alumina fiber filaments with a binder resin such as epoxy resin or silicone resin and curing the same. The aggregated yarn is, for example, an aggregate of 250 to 3000 alumina long fibers (inorganic long fibers) having a fiber diameter of 8 to 50 μm, and the diameter of the aggregated yarn is 0.1 mm to 2 mm. Therefore, the diameter of the wire 41 is 0.1 mm to 2 mm, similar to the diameter of the aggregated yarn. The inorganic long fibers are not particularly limited as long as they are a material that is relatively abrasive to the workpiece, that is, a material that is harder and more brittle than the material to be polished. For example, silicon carbide fibers, boron fibers, or glass fibers can be used in addition to alumina fibers. These may be mixed depending on the material to be polished, and alumina fibers and silicon carbide fibers have very good abrasive properties for ferrous and non-ferrous metals. In this embodiment, alumina long fibers are used as the inorganic long fibers in the wire 41.

[0023] The cross-sectional shape of the wire 41 is circular, regular polygonal, or flat. Here, the circle means a perfect circle or an almost perfect circle, the regular polygon means a square or a regular hexagon, etc., and the flat shape means an ellipse, an oval, a rectangle, etc. In this embodiment, the wire 41 has a circular cross-sectional shape. When the wire 41 has a flat cross-sectional shape, the flattening ratio (thickness dimension / width dimension) is preferably 1.6 to 15, more preferably 1.6 to 10, and even more preferably 2.0 to 4.0.

[0024] As shown in Figures 7(a), (b), and (c), a bundle of wires 41 forms a wire assembly 45 whose ends are held by a wire holder 44 with adhesive, and is held in a holding hole 46 of a brush holder 43 in the state of wire assembly 45.

[0025] In the wire assembly 45, the wire holder 44 has a bottom 47 located at the end on the other side L2 in the direction of the axis L, and a cylindrical tube part 48 extending from the outer edge of the bottom 47 toward the one side L1 in the direction of the axis L, and the bundle end of the wires 41 is fixed to the inside of the tube part 48 with an adhesive. In this embodiment, the holding hole 46 is a circular hole, and the tube part 48 of the wire holder 44 has an outer diameter dimension slightly smaller than the inner diameter dimension of the holding hole 46.

[0026] In this embodiment, when the wire assembly 45 having such a configuration is attached to the brush holder 43, the wire assembly 45 is detachably attached to the holding hole 46 of the brush holder 43 by a screw-type fixing mechanism 50 using a set screw 49. More specifically, a first fixing hole 51 penetrating in a direction perpendicular to the axis L direction is formed in the bottom 47 of the wire holder 44, and a female thread 52 is formed on the inner peripheral surface of the first fixing hole 51. A second fixing hole 54 penetrating from the outer peripheral surface to the holding hole 46 is formed in the cylindrical portion 53 of the brush holder 43, and a recess 56 is formed in an inner wall 55 of the holding hole 46 on the opposite side (diametrically inner side) to the side where the second fixing hole 54 is located, at a position facing the second fixing hole 54.

[0027] In this embodiment, to attach the wire assembly 45 to the brush holder 43, first, the wire assembly 45 shown in Fig. 7(a) is prepared, and then, as shown in Fig. 7(b), a set screw 49 is fastened to the inside of the first fixing hole 51. In this embodiment, the length of the set screw 49 is smaller than the length of the first fixing hole 51, so the set screw 49 does not protrude from the first fixing hole 51.

[0028] Next, the wire holder 44 of the wire assembly 45 is inserted into the holding hole 46 of the brush holder 43. At this time, the orientation of the wire holder 44 is adjusted to make the first fixing hole 51 communicate with the second fixing hole 54 and the recess 56. Next, the shaft of a screwdriver is inserted through the second fixing hole 54, and the set screw 49 is tightened, so that the tip of the set screw 49 abuts against the inner wall 55 on the opposite side (diametrically inner side) of the holding hole 46 from the side where the second fixing hole 54 is located, as shown in FIG. 7(c). As a result, the wire holder 44 is detachably attached to the holding hole 46 of the brush holder 43 by the screw-type fixing mechanism 50 consisting of the female thread 52 and the set screw 49. In addition, since the tip of the set screw 49 enters the inside of the recess 56, it is possible to reliably prevent the wire assembly 45 from coming off. 57 is a bottom plate part of the brush holder 43.

[0029] (How to replace wire assembly 45) In the polishing process using the brush-like grindstone 42 and polishing brush of this embodiment, when a defect such as wear or breakage of the wire 41 occurs in any of the multiple wire assemblies 45 held by the brush holder 43, the set screw 49 is loosened, the wire assembly 45 with the defect is removed from the brush holder 43, and another wire assembly 45 is attached to the brush holder 43, and the polishing process is performed. Also, when all of the multiple wire assemblies 45 held by the brush holder 43 are worn, the set screw 49 is loosened and all of the wire assemblies 45 are replaced, and then the polishing process is performed.

[0030] (How to change the number of wire assembly 45) In the polishing process using the brush-like grindstone 42 and polishing brush of this embodiment, if the type of workpiece changes and it becomes necessary to reduce the number of wire assemblies 45, the set screws 49 are loosened and some of the wire assemblies 45 are removed from the brush holder 43 to perform the polishing process. If the type of workpiece changes and it becomes necessary to increase the number of wire assemblies 45, the set screws 49 are used to attach the wire assemblies 45 to the brush holder 43 to perform the polishing process.

[0031] (Main effects of this form) As described above, the brush-like grindstone 42 and the polishing brush of this embodiment use a wire assembly 45 in which the wires 41 are bundled and the ends are fixed to the wire holder 44 by adhesive, and the wire assembly 45 is detachably attached to the holding hole 46 of the brush holder 43 by the screw-type fixing mechanism 50. Therefore, when the need arises to reduce, add, or replace the multiple wire assemblies 45 held by the brush holder 43, such a response can be easily made. Therefore, even if the brush holder 43 is made larger in diameter and multiple bundles of wires 41 are provided over a wide area of ​​the brush holder 43 to efficiently polish a wide area of ​​the workpiece, the number of bundles of wires can be varied in one brush-like grindstone 42 depending on the type of workpiece to be polished. Also, even if any of the multiple bundles of wires 41 has a defect such as wear or breakage, only the necessary bundle needs to be replaced, and there is no need to discard the entire brush-like grindstone 42. Therefore, the cost required for the polishing process can be reduced.

[0032] In addition, since the length of the set screw 49 is smaller than the length of the first fixing hole 51, as shown in Fig. 7(b), the wire holder 44 can be fitted into the holding hole 46 with the set screw 49 already attached inside the first fixing hole 51. This makes it possible to efficiently attach the wire assembly 45 to the brush holder 43.

[0033] 8 is a schematic diagram of a second embodiment showing a state in which a wire holder for a wire assembly used in an abrasive brush of the present invention is fixed in a holding hole with a set screw. Note that the basic configuration of this embodiment is the same as that of the first embodiment. Therefore, the same reference numerals are used to denote common parts, and their explanation will be omitted.

[0034] 8, in this embodiment, as in the first embodiment, a bundle of wires 41 constitutes a wire assembly 45 whose ends are held by a wire holder 45, and is held in a holding hole 46 of a brush holder 43 in the state of the wire assembly 45. The wire assembly 45 is detachably attached to the holding hole 46 of the brush holder 43 by a screw-type fixing mechanism 50 that utilizes a set screw 49.

[0035] Here, a through hole 58 communicating with the holding hole 46 is formed in the brush holder 43 at a portion overlapping the wire holder 44 on the other side L2 in the axial direction L. Therefore, when removing the wire assembly 45, the wire holder 44 can be pushed out of the holding hole 46 by a jig (not shown) inserted into the through hole 58 as shown by the arrow P. Therefore, even if the outer diameter dimension of the tubular portion 48 of the wire holder 44 is set slightly smaller than the inner diameter dimension of the holding hole 46, the wire holder 44 can be easily removed from the holding hole 46. The jig may be configured to be insertable into only one through hole 58, or may be configured to be insertable into multiple through holes 46 at the same time. Other configurations are the same as those in the first embodiment, and therefore will not be described.

[0036] Hereinafter, an embodiment of the bristle material for an abrasive brush will be described with reference to the drawings.

[0037] (Bristles for abrasive brushes according to the first and second embodiments) Conventionally, abrasive brushes such as disk roll brushes and channel roll brushes have been used to clean and polish the surfaces of workpieces such as rolling rolls in the manufacturing process of metal plates, and the bristles of these abrasive brushes are made of synthetic resin monofilaments containing abrasive particles.

[0038] These abrasive brushes are pressed against the surface of a rolling roll and the surface of the workpiece while rotating at high speed, and are used to remove sludge and rust that has adhered to the surface of the rolling roll and the workpiece. However, frictional heat generated between the abrasive roll brush and the rolling roll causes thermal deterioration of the bristles of the abrasive brush, so in order to prevent this thermal deterioration, an external water cooling method is adopted in which water is sprayed from the outside of the abrasive roll brush to cool the bristles of the abrasive brush.

[0039] However, with this external water cooling method, even if water is sprayed from the outside of the abrasive brush rotating at high speed, centrifugal force prevents the water from reaching the inside of the abrasive brush, and problems such as insufficient cooling can cause the base of the bristles of the abrasive brush to break.As a countermeasure to this problem, some have adopted an internal water cooling method in which water is sprayed from the inside of the abrasive brush to cool it, but this method not only makes the structure of the abrasive brush more complicated, but also increases the price of the abrasive brush, making it economically undesirable to adopt.

[0040] As a conventional technique for dealing with these problems, abrasive brush bristle material in which abrasive grain-containing synthetic resin monofilaments are covered with multifilaments (see, for example, Japanese Patent Application Laid-Open No. 2001-32756) has already been proposed.

[0041] However, even with abrasive brush bristles covered with multifilaments, the bristles rub strongly against each other, causing problems such as the multifilaments coming undone, the multifilaments breaking and adhering to the workpiece being polished, and the broken multifilaments clogging the cooling pipes during the cooling process for the workpiece being polished. Therefore, there has been a strong demand for further improvements in abrasive brush bristles.

[0042] Furthermore, when used for heavy-duty grinding of steel, the bristles of the abrasive brushes are planted at a high density, generating a lot of frictional heat, making it necessary to cool the bristles all the way to the base, and so there was a strong demand for abrasive brush bristles with excellent water absorption properties.

[0043] 9(a) and (b) show a first embodiment of bristle material for an abrasive brush that has an excellent cooling effect and exhibits sustained abrasive performance, particularly when used with an external water-cooling system, in which a plurality of abrasive particle-containing synthetic resin monofilaments 62 (three in the drawing) are aligned in the outer circumferential longitudinal direction of a synthetic resin multifilament 61 having a total fineness of 470 to 15,000 dtex and fixed with an adhesive 63. Also, Figs. 10(a) and (b) show a second embodiment of bristle material for an abrasive brush that has an excellent cooling effect and exhibits sustained abrasive performance, particularly when used with an external water-cooling system, in which the bristle material for an abrasive brush of the first embodiment is further twisted.

[0044] According to the abrasive brush bristles shown in Figures 9(a)(b) and 10(a)(b), particularly when used with an external water cooling method, cooling water is drawn up into the synthetic resin multifilament 61 at the center of the abrasive brush bristles by capillary action and reaches sufficiently deep into the abrasive brush, thereby maintaining an excellent cooling effect, preventing breakage of the abrasive brush bristles, and resulting in an abrasive brush bristles and an abrasive brush that exhibit sustained abrasive performance.

[0045] The total fineness of the synthetic resin multifilament 61 is preferably in the range of 470 to 15,000 dtex, and if the total fineness is less than 470 dtex, the proportion of the abrasive grain-containing synthetic resin monofilament 62 constituting the bristles for the abrasive brush decreases, and the frictional heat generated when used to clean and polish the surface of the workpiece to be polished, such as a rolling roll, in the metal rolling process, which is one of the manufacturing processes for metal plates, increases, making it impossible to prevent thermal deterioration of the bristles for the abrasive brush. Conversely, if the total fineness of the synthetic resin multifilament 61 exceeds 15,000 dtex, the total fineness of the abrasive grain-containing synthetic resin monofilament 62 also increases, making it difficult to manufacture the abrasive brush, which is not preferable.

[0046] In the bristle material for abrasive brushes of this embodiment, the mixing ratio of the synthetic resin multifilament 61 is preferably 10 to 30% by weight. If the mixing ratio of the synthetic resin multifilament 61 is less than 5%, the water absorption performance is reduced, and the durability of the bristle material for abrasive brushes tends to be inferior. On the other hand, if the mixing ratio of the synthetic resin multifilament 61 exceeds 30% by weight, the mixing ratio of the synthetic resin monofilament 62 containing abrasive particles is small, and the abrasive performance is inferior, which tends to be undesirable. By arranging the synthetic resin monofilament 62 containing abrasive particles in the outer periphery longitudinal direction of the synthetic resin multifilament 61 within this mixing range, the bristle material for abrasive brushes can obtain water absorption performance due to capillary phenomenon, and cooling water is led to the entire bristle material for abrasive brushes in the external water cooling method of the metal rolling process, and the excellent cooling effect can prevent the bristle material for abrasive brushes from breaking. Furthermore, since the synthetic resin multifilament 61 is located at the center of the abrasive particle-containing synthetic resin monofilament 62, breakage and fraying of the multifilament 61 due to friction between the bristles for the abrasive brush can be suppressed during cleaning and polishing of the surface of the workpiece to be polished, such as a rolling roll in the manufacturing process of metal plate, and thus it is possible to obtain bristles for the abrasive brush and an abrasive brush that exhibit sustained polishing performance.

[0047] In the first embodiment shown in Figures 9(a) and (b), three synthetic resin monofilaments 62 containing abrasive particles are arranged in the outer circumferential longitudinal direction of a synthetic resin multifilament 61, and the synthetic resin monofilaments 62 containing abrasive particles are fixed to each other via an adhesive 63. As the adhesive 63 used here, an adhesive normally used in the industry, such as a hot melt resin, can be used, and the bonding method is not particularly restricted. Furthermore, the number of synthetic resin monofilaments 62 containing abrasive particles must be two or more, and preferably three or more.

[0048] In the second embodiment shown in Fig. 10(a)(b), the monofilaments 62 are further twisted to those obtained in Fig. 9(a)(b). By twisting, the bonds between the abrasive particle-containing synthetic resin monofilaments 62 become stronger, and the abrasive particle-containing synthetic resin monofilaments 62 can be prevented from peeling off from each other during cleaning and polishing of the surface of the workpiece such as a rolling roll in the manufacturing process of the metal plate. The number of twists here is preferably in the range of 10 to 60 times per meter. If the number of twists is less than 10 times, the effect of preventing the abrasive particle-containing monofilaments 62 from peeling off from each other is small, and if the number of twists is 60 times or more, the multifilaments 61 in the center tend to be compressed and lose water absorbency.

[0049] Examples of thermoplastic resins that can be used in the abrasive particle-containing synthetic resin monofilament of this embodiment include polyamide-based resins such as nylon 6, nylon 66, nylon 610, nylon 612, nylon 6 / 66 copolymer, and nylon 6 / 12 copolymer, and polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polymethylene naphthalate, and polybutylene naphthalate.

[0050] The abrasive particles used in the abrasive particle-containing synthetic resin monofilament of the present invention include alumina oxide, silicon carbide, and artificial diamond, and the grit size of these particles is preferably in the range of #36 to #3000, particularly #60 to #2000, as specified in the abrasive grain size JIS R6001 (1973).

[0051] The content of the above-mentioned abrasive particles in the thermoplastic resin composition must be in the range of 5 to 40% by weight, and more preferably in the range of 10 to 30% by weight. If the content of the abrasive particles is below the above range, the abrasive brush bristle material tends to lack abrasive power, whereas if the content exceeds the above range, the strength of the monofilament is reduced, and the abrasive brush bristle material tends to lack breakage resistance.

[0052] The thermoplastic resin used in the synthetic resin multifilament of this embodiment is not particularly limited, but is preferably a multifilament composed of one type of resin selected from nylon 6, nylon 66, and polyethylene terephthalate, and has the total fineness described above.

[0053] (Bristles for abrasive brushes according to a third embodiment) As a third embodiment of bristles for an abrasive brush, which has an excellent cooling effect, particularly when used with an external water-cooling method, and exhibits sustained abrasive performance, Figures 11 and 12 show bristles for an abrasive brush, which have a layer of adhesive 72 on the outer surface of a main body 71 which is a monofilament containing abrasive particles, and short fibers 73 are implanted through the adhesive 72.

[0054] According to the abrasive brush bristles shown in Figures 11 and 12, particularly when used with an external water cooling method, cooling water is drawn up into the short fibers 73 planted on the surface of the abrasive brush bristles by capillary action and can penetrate toward the base of the abrasive brush bristles, thereby maintaining an excellent cooling effect.In addition, the short fibers 73 planted on the surface of the abrasive brush bristles act as a protective material and reduce friction between the abrasive brush bristles, thereby preventing breakage of the abrasive brush bristles and obtaining abrasive brush bristles that exhibit sustained abrasive performance.

[0055] The monofilament containing the abrasive particles of the main body 71 is not particularly limited, but one having a fineness in the range of 500 to 15,000 dtex and having appropriate rigidity and flexibility as an abrasive brush can be suitably used. The cross-sectional shape of the monofilament is not particularly limited, but it can be an ellipse, a triangle, a rectangle, or other irregular shape in addition to a circle.

[0056] The monofilament containing the abrasive particles is made of a thermoplastic resin, such as polyester resins such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and polybutylene naphthalate, polyamide resins such as nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 612, nylon 1010, nylon 6 / 66 copolymer, nylon 6 / 12 copolymer and nylon ternary copolymer, polyolefin resins such as polyethylene and polypropylene, etc. Also, as the thermoplastic resin, a biodegradable resin can be preferably used, and preferred biodegradable resins include aliphatic polyesters such as polylactic acid, polycaprolactone, polybutylene succinate, polyethylene succinate, polyglycolic acid, polyalkylene alkanoate and polyβ-hydroxyalkanoate, and copolymers of aliphatic polyesters and aromatic polyesters, which are also biodegradable. In addition to the above, fluororesins such as polyvinylidene fluoride, polyphenylene sulfide, polyether ether ketone, polyoxymethylene, etc. can be used. These may be used alone or in mixture. Among them, polyester resin and polyamide resin are preferably used because they are inexpensive and have excellent toughness and flexibility.

[0057] Examples of the abrasive particles used in the monofilament containing the abrasive particles include alumina oxide, silicon carbide, and artificial diamond.

[0058] Examples of the adhesive include water-based emulsions such as acrylic, urethane, vinyl acetate, EVA, and nylon adhesives, and organic solvent-based adhesives.

[0059] Here, examples of the means for applying the adhesive 72 to the main body 71 include a method for applying the adhesive 72 to the surface of the main body 71 by dipping, a roller, a nozzle, a doctor knife method, or the like.

[0060] The short fibers 73 may be natural fibers such as cotton, silk, and wool, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, synthetic fibers made of thermoplastic resins such as polyamide, polyester, and polyacrylonitrile, and even inorganic fibers such as carbon fibers. They are appropriately selected according to the required water absorption properties and are not particularly limited, but polyamide and polyester fibers, which have excellent durability, are preferably used, especially when used as a polishing brush.

[0061] The length of the short fibers 73 is preferably 0.5 to 2 mm, more preferably 0.8 to 1.2 mm. If the length exceeds 2 mm, uniform implantation becomes difficult, which may lead to a deterioration in quality, and the fineness of the abrasive brush bristle material after implantation may become too large, which may limit the design of the abrasive brush. Conversely, if the length is less than 0.5 mm, the abrasive brush may have low interfiber water absorption and may not provide a sufficient cooling effect. In order to obtain an excellent cooling effect due to interfiber water absorption, it is preferable that the length of the short fibers 73 is constant.

[0062] The fineness of the short fibers 73 is preferably 2 to 25 dtex, and more preferably 2 to 10 dtex. If the fineness is 25 dtex or less, the water absorption of the bristles for the abrasive brush increases and the cooling effect is further improved, while if the fineness is 2 dtex or more, the protective effect of reducing friction between the bristles for the abrasive brush is improved and the short fibers are less likely to fall off, which is more preferable.

[0063] (Bristles for abrasive brushes according to the fourth and fifth embodiments) However, the polished surfaces of metal members or machine parts are complicated because they are not only flat but also have concave and convex surfaces. This makes the polishing deburring process difficult to perform. In addition, during the polishing deburring process, a coolant is flowed over the surface of the object to be polished, but in recent years, the handling of the coolant has become particularly strict due to concerns about waste disposal of the coolant and its effects on the human body.

[0064] As a means for solving these problems, a dry polishing method that does not use coolant liquid from an environmental perspective has been used. As for the bristle material for the polishing brush used in this dry polishing, there have already been proposed abrasive brush bristle materials in which fluororesin is added together with abrasive particles to the synthetic resin that constitutes the bristle material (see, for example, the specification of Patent No. 4189535), and abrasive brush bristle materials in which azine-based pigments are added together with abrasive particles (see, for example, the specification of Patent No. 3965471), etc., in order to prevent the bristle material from melting and fusing due to the frictional heat between the polished object and the polishing brush.

[0065] However, although these conventional abrasive brush bristles have improved melting and fusion between the bristles compared to ordinary abrasive brush bristles, the bristles rub against each other strongly during the abrasive process, not only causing the brush bristles to wear down and break, generating brush debris, but also generating abrasive debris from the object being abraded. This brush debris and abrasive debris become statically charged and adhere to the object being abraded, soiling its surface, and not only preventing the brush bristles from continuously exerting their abrasive performance, so there remains a strong demand for further improvements.

[0066] Therefore, as a bristle material for an abrasive brush which can suppress static electricity generated during abrasive processing, prevent dirt due to adhesion of brush dust and abrasive dust, and further has excellent durability and exhibits sustained abrasive performance, as shown in FIG. 13 which is a fourth embodiment and FIG. 14 which is a fifth embodiment, the bristle material for an abrasive brush of this embodiment comprises a monofilament 81 made of a thermoplastic resin composition containing abrasive particles, at least a part of the surface in the longitudinal direction of the monofilament 81 is provided with a conductive resin layer 82 containing 5 to 40% by weight of carbon black particles, and the weight ratio of the monofilament 81 to the conductive resin layer 82 is 70 to 95:30 to 5.

[0067] According to the bristle material for an abrasive brush shown in Figures 13 and 14, a conductive resin layer 82 containing 5 to 40% by weight of carbon black particles is provided on at least a portion of the longitudinal surface of the monofilament 81 containing abrasive particles, thereby giving the bristle material a static electricity suppressing effect. This suppresses static electricity generated during the polishing process and prevents contamination due to the adhesion of brush dust and polishing dust, and further provides bristle material for an abrasive brush and an abrasive brush that are highly durable and exhibit sustained polishing performance. [Industrial Applicability]

[0068] According to the invention, objects having convex, concave or planar surfaces can be polished. [Explanation of symbols]

[0069] 1 Core 3a, 3b, 3c Brush 4 Base part 5. Bristles for polishing brushes 6a, 6b, 6c Brushes 7 Base part 8. Bristles for polishing brushes 9 Base Frame 10 Motor 11 Base frame 12 Motor 13 Connection parts 14 Universal joint 15 Connection parts 16 Connection parts 17 Universal joint 18 Connection parts 19 Basics 20 Lifting table 21 Handle 22 Tables 23a, 23b struts 24 Beam 25 Slide Block 26 Stand 27 Lead screw shaft 28 Linear guide 29 Guide bar 30 Handle 31, 32, 33 Object to be polished 34 Board material A, B position adjustment mechanism

Claims

[Claim 1] This abrasive brush is characterized in that a number of rotatable brushes 1 are arranged along the length of one outer periphery of a core bar having a curved outer periphery with a constant curvature, and a number of rotatable brushes 2 are arranged along the length of the other outer periphery of the core bar, which is 180° opposite to the position where brushes 1 are arranged, and the core bar is rotatable around its axis.

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