US20240189957A1 - Belt processing device - Google Patents
Belt processing device Download PDFInfo
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- US20240189957A1 US20240189957A1 US18/553,050 US202218553050A US2024189957A1 US 20240189957 A1 US20240189957 A1 US 20240189957A1 US 202218553050 A US202218553050 A US 202218553050A US 2024189957 A1 US2024189957 A1 US 2024189957A1
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- Prior art keywords
- roller
- belt
- machining
- spindle
- workpiece
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Links
- 230000002265 prevention Effects 0.000 claims abstract description 24
- 238000003754 machining Methods 0.000 claims description 77
- 239000012530 fluid Substances 0.000 claims description 30
- 238000010248 power generation Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 description 18
- 230000002093 peripheral effect Effects 0.000 description 14
- 239000002826 coolant Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000013011 mating Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
- B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/14—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by liquid or gas pressure
Definitions
- the present invention relates to a belt machining device which machines a workpiece surface with an endless machining belt which is stretched between a plurality of rollers.
- the surface of a mold used for plastic injection molding and the precision seal surface provided in a vacuum chamber or the like are usually subjected to a polishing after cutting in order to improve their function or appearance.
- a belt polishing tool which can be attached to the spindle of a machine tool is sometimes used.
- the present invention aims to solve the above problems of the prior art, and an object thereof is to provide a belt machining device which can efficiently obtain a suitable machined surface (polished surface) by simply setting a normal machining belt without adding a complicated structure.
- FIG. 2 is a side view of a belt machining device according to an embodiment of the present invention.
- FIG. 3 is a perspective view of the belt machining device of FIG. 2 .
- FIG. 4 is a sectional view of the belt machining device of FIG. 2 .
- FIG. 5 is a cross-sectional view of a first roller according to an embodiment.
- FIG. 6 is a cross-sectional view of an elastic ring.
- FIG. 7 is a cross-sectional view showing a modified example of the first roller.
- FIG. 1 is a side view showing a machine tool 100 , which is a general vertical machining center, and a belt machining device 10 according to an embodiment of the present invention, which is attached to the machine tool 100 .
- the machine tool 100 of FIG. 1 comprises a bed 102 as a pedestal which is affixed to the floor surface of a factory, a table 104 which is provided on the upper surface of the bed 102 so as to be movable in the Y-axis direction or the front-rear direction (the horizontal direction in FIG.
- a column 108 which stands on the upper surface of a rear portion of the bed 102
- an X-axis slider 110 which is provided on the front surface of the column 108 so as to be movable in the X-axis direction or in the left-right direction (the direction perpendicular to the surface of the paper of FIG. 1 )
- a spindle bead 112 which is provided on the front surface of the X-axis slider 110 so as to be movable in the Z-axis direction or the upward-downward direction relative to the X-axis slider 110 , and which supports a spindle 114 so as to be rotatable about a vertical rotation axis O.
- the machine tool 100 further comprises an X-axis feed device (not illustrated) which reciprocatably feeds the X-axis slider 110 in the X-axis direction, a Y-axis feed device (not illustrated) which reciprocatably feeds the table 104 in the Y-axis direction, and a Z-axis feed device (not illustrated) which reciprocatably feeds the spindle head 112 in the Z-axis direction.
- the machine tool 100 further comprises a spindle motor (not illustrated) which rotatably drives the spindle 114 .
- the spindle motor may be arranged outside or inside the housing (not illustrated) of the spindle head 112 .
- the spindle motor be capable of holding the spindle 114 at predetermined angular positions around the rotation axis O by its torque.
- the machine tool 100 further comprises an NC device (not illustrated) which controls the spindle motor and the three orthogonal X, Y, and Z-axis feed devices.
- the machine tool 100 preferably further comprises an automatic tool exchange device (not illustrated) for changing the tool (not illustrated) attached to the tip of the spindle 114 .
- the machine tool 100 forms a vertical machining center, and the spindle 114 can be moved and positioned relative to the workpiece W in the three orthogonal directions of the X, Y and Z axes, and angularly positioned around the rotation axis O.
- a tapered hole (not illustrated) for mounting a tool (not illustrated) is formed in the tip of the spindle 114 of the machine tool 100 . Furthermore, a central hole (not illustrated) extending along the axis O of rotation is formed in the spindle 114 .
- a tool clamping device such as a drawbar (not illustrated) is arranged in the central hole of the spindle 114 for securing the tool mounted in the tapered hole.
- the tool clamping device is configured to secure an HSK-type holder, which is a type of two-sided constraint, to the tapered hole of the spindle 114 .
- the belt machining device 10 is mounted in the tapered hole of the spindle 114 of the machine tool 100 .
- the belt machining device 10 comprises a body part 20 and a holder part 12 which fits into the tapered hole of the spindle 114 of the machine tool 100 , as shown in FIGS. 2 to 4 .
- the tapered hole may be a tapered hole for mounting a tool holder (not illustrated) conforming to HSK standard (DIN69893).
- the tapered hole may be adapted to fit the tapered portion of other shank shapes, such as a 7/24 taper shank shape.
- the holder part 12 comprises a tapered part 14 which can be brought into close contact with the inner peripheral surface of the tapered hole of the spindle 114 of the machine tool 100 , a cylindrical extension part 16 which is coupled to the body part 20 , and a flange part 18 between the extension part 16 and the holder part 12 .
- a circumferentially extending V-groove 18 a which is configured to engage a changer arm (not illustrated) of the automatic tool exchange device associated with the machine tool 100 is formed in the flange part 18 .
- the holder part 12 and in particular the tapered part 14 and the flange part 18 , are formed so as to conform to the HSK standard (DIN69893). As shown in FIG.
- the holder part 12 may be a commercially available tool holder conforming to the HSK standard (DIN69893).
- a central hole 12 a and a tool mounting hole 16 a may be formed along the central axis O 1 .
- the hollow spindle 114 is provided with a clamping device comprising a drawbar (not illustrated) in the hollow interior space thereof extending along the axis of rotation O, a plurality of collets (not illustrated) arranged at equal angular intervals in the circumferential direction about the drawbar in the tapered hole, and a plurality of disc springs (not illustrated) arranged about the drawbar in the internal space of the spindle.
- a clamping device comprising a drawbar (not illustrated) in the hollow interior space thereof extending along the axis of rotation O, a plurality of collets (not illustrated) arranged at equal angular intervals in the circumferential direction about the drawbar in the tapered hole, and a plurality of disc springs (not illustrated) arranged about the drawbar in the internal space of the spindle.
- the drawbar of the clamping device is a hollow member forming a fluid passage through which a gas such as pressurized air or a liquid such as coolant flows.
- the fluid passage is connected to a fluid source (not illustrated).
- the fluid source may comprise a compressor for compressing air (not illustrated), a tank for storing pressurized air (not illustrated), and a pressure regulating valve (not illustrated) installed at the outlet of the tank to adjust the pressure of the supplied pressurized air to a predetermined pressure.
- the fluid source may comprise a pump (not illustrated) for pressurizing the liquid, and a pressure regulating valve (not illustrated) installed at the outlet of the pump to adjust the pressure of the liquid to be supplied to a predetermined pressure.
- the fluid source may be a service air system of the factory where the machine tool 100 is installed, or a coolant supply (not illustrated) attached to the machine tool 100 .
- the body part 20 comprises, as primary components, a belt drive unit 30 , a rotational power generation unit 60 , and a power transmission unit 70 .
- the belt drive unit 30 , rotational power generation unit 60 , and power transmission unit 70 are attached to a frame 22 .
- the frame 22 has at least a base part 24 and side wall parts 26 extending perpendicularly from base part 24 .
- the side wall parts 26 extend in directions approaching the table 104 and the workpiece W affixed to the table 104 when the belt machining device 10 is attached to the tip of the spindle 114 of the machine tool 100 , as shown in FIG. 1 .
- the base part 24 and the side wall parts 26 are separate members and are fastened together by bolts 24 a , but the base part 24 and the side wall parts 26 may be integrally formed.
- the body part 20 of the belt machining device 10 comprises a joint part 28 which is joined to the frame 22 .
- the joint part 28 protrudes from the upper surface of the base part 24 to the side opposite to the side wall part 26 .
- the joint part 28 is fastened to the base part 24 by a plurality of bolts 24 b .
- the extension part 16 of the holder part 12 may be joined to the base part 24 using fastening means such as bolts.
- the joint part 28 has a mating part 28 a which mates with the tool mounting hole 16 a of the holder part 12 , and a flange part 28 b which is integrally coupled to the lower end of the mating part 28 a , and a central hole 28 c which extends along a central axis O 2 is formed therein.
- the mating part 28 a is mated with the tool mounting hole 16 a of the holder part 12 , the central axis O 1 of the holder part 12 and the central axis O 2 of the joint part 28 are aligned.
- the holder part 12 and the joint part 28 are formed from separate members, and the central hole 12 a of the holder part 12 is formed so as to open into the tool mounting hole 16 a .
- the mating part 28 a is mated with the tool mounting bole 16 a of the holder part 12
- the central hole 12 a of the holder part 12 and the central hole 28 c of the joint part 28 communicate with each other to form one fluid supply passage.
- the central hole 12 a of the holder part 12 is formed so as to pass through the holder part 12 along the central axis O 1 .
- the central hole 12 a of the holder part 12 forms the fluid supply passage.
- the fluid supply passage communicates with the fluid passage formed in the drawbar of the clamping device when the holder part 12 is clamped in the tapered hole of the spindle 114 .
- a belt drive unit 30 is attached to the side wall part 26 of the frame 22 .
- the belt drive unit 30 comprises a first roller 40 and a second roller 32 , between which a machining belt 34 is stretched.
- the machining belt 34 is formed in an endless shape by joining both ends of a base material such as a cloth to which an abrasive is adhered.
- the grain size of the abrasive to be adhered may be appropriately determined in accordance with the surface roughness required for polishing or grinding to perform.
- the first roller 40 is rotatably supported by the side wall part 26 and a bracket 36 attached to the side wall part 26 . More specifically, the first roller 40 is attached to a rotating shaft 38 which is rotatably supported by the side wall part 26 and the bracket 36 by bearings 36 a , 36 b .
- a key 38 a which engages with the inner peripheral surface of the first roller 40 and the outer peripheral surface of the rotating shaft 38 is arranged between the first roller 40 and the rotating shaft 38 , whereby the first roller 40 may be prevented from rotating relative to the rotating shaft 38 .
- the first roller 40 comprises a cylindrical roller body 42 , at least one elastic ring 44 as an elastic body fitted to the outer peripheral surface of the roller body 42 , and an end plate 48 .
- the roller body 42 has a central hole 42 a through which the rotating shaft 38 passes.
- An axially extending groove 42 b through which the key 38 a passes may be formed in the inner peripheral surface of the roller body 42 .
- One end of the roller body 42 is provided with a radially protruding flange part 42 c which prevents detachment of the elastic ring 44 .
- a recess 42 d for receiving the end plate 48 is formed at the other end of the roller body 42 .
- the elastic ring 44 is an annular member which is attached to the outer peripheral surface of the roller body 42 and which is composed of an elastic material such as foamed rubber, for example, a fluororubber sponge.
- the elastic ring 44 has a slit 44 a extending in the circumferential direction and an inner peripheral surface 44 b in close contact with the outer peripheral surface of the roller body 42 .
- the slit 44 a is formed at a predetermined axial width (axial dimension) and a predetermined radial depth from the outer peripheral surface of the elastic ring 44 .
- the slit 44 a may be a simple cut which is cut radially from the outer peripheral surface to a predetermined depth.
- the expansion prevention member 46 is fitted into the slit 44 a to prevent radial expansion and deformation of the elastic ring 44 due to centrifugal force when the first roller 40 rotates.
- the expansion prevention member 46 may be an annular member composed of a material having an elastic modulus greater than that of the elastic ring 44 as the elastic body, such as a thin resin plate.
- the expansion prevention member 46 may be two arcuate members obtained by diametrically dividing the annular member into two or three arcuate members obtained by dividing the annular member in three so that the central angle is 120°. If the expansion prevention member 46 comes into contact with the machining belt 34 , the tension of the machining belt 34 is adversely affected. Therefore, the outer diameter of the expansion prevention member 46 is preferably smaller than the outer diameter of the elastic ring 44 during both machining and non-machining.
- the end plate 48 has a cylindrical body part 48 a and a radially projecting flange part 48 b at one end of the body part 48 a .
- a central hole 48 c through which the rotating shaft 38 passes is formed in the end plate 48 .
- the second roller 32 is attached to a rotating shaft 52 which is rotatably supported by a U-shaped cradle 50 .
- the cradle 50 is provided so as to be movable in the direction indicated by arrow A along a guide 59 .
- a stud 54 is affixed to the bracket 36 and inserted into a hole (not illustrated) of the cradle 50 with a gap therebetween.
- a coil spring 56 is arranged around the stud 54 .
- the cradle 50 is biased away from the bracket 36 by the coil spring 56 .
- the cradle 50 may be affixed at an arbitrary distance from the bracket 36 by a pin 58 serving as an affixation mechanism.
- the position of the cradle 50 can be secured by rotating the pin 58 .
- the pin 58 is released, the cradle 50 is moved along the guide 59 toward the bracket 36 , the pin 58 is affixed, and the tension of the machining belt 34 is released, whereby the machining belt 34 can be removed from the first roller 40 and the second roller 32 .
- the rotational power generation unit 60 comprises a rotary motor.
- the rotary motor may be an electric motor, it is preferably a fluid motor, and in particular, a pneumatic motor with a turbine (not illustrated).
- the pneumatic motor as the rotational power generation unit 60 has a turbine housing 62 defining a casing 64 that rotatably houses the turbine and a fluid inlet port 66 which communicates with the casing 64 .
- the fluid inlet port 66 communicates with the fluid supply passage. In the present embodiment, the fluid inlet port 66 communicates with central holes 12 a , 28 c of the holder part 12 and the joint part 28 .
- the power transmission unit 70 comprises a first pulley 72 , a second pulley 74 , a drive belt 76 stretched between the first pulley 72 and the second pulley 74 , and a tensioner 78 .
- the first pulley 72 is mounted on an output shaft 68 for rotation with the output shaft 68 of the pneumatic motor as the rotational power generation unit 60 and forms an input pulley.
- the second pulley 74 is mounted on the rotating shaft 38 for rotation with the rotating shaft 38 for the first roller 40 .
- the drive belt 76 may be a toothed belt or a cog belt.
- the first pulley 72 and the second pulley 74 are constituted by toothed pulleys having a plurality of teeth which engage the teeth of the drive belt 76 .
- the drive belt 76 is under constant tension between the first pulley 72 and the second pulley 74 by the tensioner 78 , which has a freewheeling roller 78 a which engages the back of the drive belt 76 .
- the fluid supply passages 12 a . 28 c communicate with the fluid passage of the drawbar of the clamping device.
- the fluid from the fluid supply source such as pressurized air or coolant, is supplied to the casing 64 through the fluid passage of the drawbar of the tool clamping device of the spindle, the fluid supply passages 12 a , 28 e of the belt machining device 10 , and the fluid inlet port 66 of the fluid motor as the rotational power generation unit 60 , and rotates the turbine disposed in the casing 64 .
- This rotation is transmitted to the rotating shaft 38 through the first pulley 72 attached to the output shaft 68 of the fluid motor, the drive belt 76 , and the second pulley 74 , whereby the first roller 40 , which is a machining roller, rotates, and the machining belt 34 stretched between the first roller 40 and the second roller 32 is driven.
- the first roller 40 serves as the driving roller and the second roller 32 as the driven roller.
- the machining belt 34 is driven to circulate between the first roller 40 and the second roller 32 , the surface of workpiece W is machined (grinded or polished) by the relative movement of the spindle 114 and the table 104 while the first roller 40 is pressed against the surface of workpiece W with the machining belt 34 interposed therebetween.
- the elastic ring 44 which is an elastic body
- the elastic body can compensate for poor mounting alignment of the machining roller and undulation of the surface of the workpiece to be machined, which are problematic for machining, whereby it is possible to obtain a suitable machined surface without creating a special program by merely running the belt machining device along the surface to be machined of the workpiece W in accordance with the machine program (NC program) matching the design shape.
- the expansion prevention member 46 is embedded in the elastic ring 44 to prevent radial expansion and deformation of the elastic ring 44 due to centrifugal force during rotation of the first roller 40 .
- the problem in that unintended tension is applied to the machining belt 34 , which adversely affects the machining of the workpiece W, and the problem in that the elastic ring 44 expands in portions which are not engaged with the machining belt 34 , which interferes with various parts of the body part 20 , can be solved by the expansion prevention member 46 .
- the expansion prevention member 46 comprises an annular member, two arcuate members, or three arcuate members composed of, for example, a resin thin plate, and is disposed in the slit 44 a of the elastic ring 44 , which is formed with a predetermined width (axial dimension) in the axial direction and a predetermined depth in the radial direction from the outer peripheral surface of the ring and which extends in the circumferential direction, but the present invention is not limited thereto. In the present invention, it is sufficient that the expansion prevention member be able to prevent the radial expansion and deformation of the elastic body provided on the outer periphery of the machining roller due to centrifugal force during rotation of the machining roller.
- FIG. 7 shows a first roller 120 , which is a modified example of a machining roller.
- the first roller 120 of the present embodiment has substantially the same configuration as the first roller 40 in the embodiment described above, except that the elastic ring as an elastic body and the expansion prevention member are different from the expansion prevention member 46 in the above embodiment.
- elastic rings 124 have slits 124 a extending in the circumferential direction.
- the slits 124 a are formed at predetermined depths from two axially opposite side surfaces of the elastic rings 124 and predetermined radial widths (radial dimensions).
- Expansion prevention members 126 a , 126 b are fitted into the slits 124 a to prevent radial expansion and deformation of the elastic rings 124 due to centrifugal force generated by the rotation of the first roller 120 .
- the expansion prevention members 126 a , 126 b may be, for example, annular members composed of thin resin plates.
- the expansion prevention members 126 a , 126 b may be two arcuate members obtained by diametrically dividing the annular member into two or three arcuate members obtained by dividing the annular member into three with a central angle of 120°.
- the expansion prevention member 126 a is arranged in slit 128 d of the flange part 128 b of the end plate 128 and slit 124 a formed in the side of the elastic ring 124 facing the slit 128 d , expansion prevention members 126 b are arranged in slits 124 a on opposite sides of the two elastic rings 124 , and expansion prevention member 126 c is arranged is slit 122 e of flange part 122 c of roller body 122 and slit 124 a formed in the side of the elastic ring 124 facing the slit 122 e.
- the first roller 120 of FIG. 7 also severs in the same manner as the first roller 40 in the embodiment described above.
- the spindle 114 can be moved and positioned relative to the workpiece W in the three orthogonal X-axis, Y-axis, and Z-axis directions, and can be angularly positioned about the rotation axis O, according to the machine tool 100 and the belt machining device 10 , belt machining can be performed on the workpiece W to form a polished surface or a ground surface having polishing or grinding marks parallel to the tool feed direction, which is suitable for a precision sealing surface provided in a vacuum chamber or the like.
- machining processes other than polishing or grinding performed by the belt machining device 10 can be integrated into the machining process performed by the machine tool 100 .
- the belt machining device 10 can be driven by the fluid supply source originally provided in the machine tool 100 to supply the coolant and pressurized air for lubrication and cooling, whereby there is no need to provide a new drive source for the belt machining device 10 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Sink And Installation For Waste Water (AREA)
Abstract
A belt processing device moves a processing belt relative to a workpiece to process the workpiece. The belt processing device comprises a first roller that is a processing roller, a second roller that is a driven roller, a processing belt that is supported by the first roller and the second roller, a pneumatic motor that rotates the first roller or the second roller, an elastic ring that is installed on the outer circumference of the first roller, and an expansion prevention member that is installed on the elastic ring and has a greater modulus of elasticity than the elastic ring.
Description
- The present invention relates to a belt machining device which machines a workpiece surface with an endless machining belt which is stretched between a plurality of rollers.
- For example, the surface of a mold used for plastic injection molding and the precision seal surface provided in a vacuum chamber or the like are usually subjected to a polishing after cutting in order to improve their function or appearance. In order to perform such polishing with an existing machine tool, a belt polishing tool which can be attached to the spindle of a machine tool is sometimes used.
- Patent Literature 1 describes a belt polishing tool, comprising a body part, a holder part which is coupled to the body part, a power generation unit, an endless polishing belt, a drive roller which rotatably supports the polishing belt and transmits rotational power received from the power generation unit to the polishing belt, a first driven roller which rotatably supports the polishing belt, and a machining roller, as a second driven roller, which rotatably supports the polishing belt and which also supports the portion of the polishing belt which contacts the workpiece during polishing.
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- [PTL 1] Japanese Unexamined Patent Publication (Kokai) No. 2020-163552
- In the belt polishing fool of Patent Literature 1, by rotatably supporting the machining roller around a rotation axis orthogonal to the rotation axis of the machining roller, the posture of the polishing belt is designed to follow the shape change of the machine surface (surface to be polished), but there are cases where the entire width of the belt cannot be used for polishing due to poor mounting alignment of the machining roller. Furthermore, even for workpieces which have been flattened, due to the mounting alignment of the workpiece, there may be portions of the machined surface which are not polished by the belt. It is not possible to create for each case a program to run the belt along the surface to be machined so as to match subtle undulations thereof”.
- The present invention aims to solve the above problems of the prior art, and an object thereof is to provide a belt machining device which can efficiently obtain a suitable machined surface (polished surface) by simply setting a normal machining belt without adding a complicated structure.
- In order to achieve the object described above, according to the present invention, there is provided a belt machining device, which moves a machining belt relative to a workpiece to machine the workpiece, the device comprising a first roller, which is a machining roller, a second roller, a machining belt which is supported by the first roller and the second roller, a rotational power generation unit which rotates the first roller or the second roller, an annular elastic body which is attached to an outer circumference of the first roller, and an annular expansion prevention member which is attached to the elastic body and which has an elastic modulus greater than the elastic body.
- According to the present invention, by attaching the elastic body to the surface of the machining roller, alignment of the machining roller at the time of machining (during belt polishing), mounting alignment of the workpiece, steps at the joint of the machining belt, and undulations in the to-be-machined surface of the workpiece can be absorbed by the elastic body, whereby a suitable machined surface can be obtained. Furthermore, the expansion prevention member prevents the radial expansion and deformation of the elastic body due to centrifugal force during rotation of the machining roller.
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FIG. 1 is a side view of an example of a machine tool to which the belt machining device of the present invention can be attached. -
FIG. 2 is a side view of a belt machining device according to an embodiment of the present invention. -
FIG. 3 is a perspective view of the belt machining device ofFIG. 2 . -
FIG. 4 is a sectional view of the belt machining device ofFIG. 2 . -
FIG. 5 is a cross-sectional view of a first roller according to an embodiment. -
FIG. 6 is a cross-sectional view of an elastic ring. -
FIG. 7 is a cross-sectional view showing a modified example of the first roller. - The preferred embodiments of the present invention will be described below with reference to the attached drawings.
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FIG. 1 is a side view showing amachine tool 100, which is a general vertical machining center, and abelt machining device 10 according to an embodiment of the present invention, which is attached to themachine tool 100. Themachine tool 100 ofFIG. 1 comprises abed 102 as a pedestal which is affixed to the floor surface of a factory, a table 104 which is provided on the upper surface of thebed 102 so as to be movable in the Y-axis direction or the front-rear direction (the horizontal direction inFIG. 1 ) and upon the upper surface of which the workpiece W is affixed, acolumn 108 which stands on the upper surface of a rear portion of thebed 102, anX-axis slider 110 which is provided on the front surface of thecolumn 108 so as to be movable in the X-axis direction or in the left-right direction (the direction perpendicular to the surface of the paper ofFIG. 1 ), and aspindle bead 112 which is provided on the front surface of theX-axis slider 110 so as to be movable in the Z-axis direction or the upward-downward direction relative to theX-axis slider 110, and which supports aspindle 114 so as to be rotatable about a vertical rotation axis O. - The
machine tool 100 further comprises an X-axis feed device (not illustrated) which reciprocatably feeds theX-axis slider 110 in the X-axis direction, a Y-axis feed device (not illustrated) which reciprocatably feeds the table 104 in the Y-axis direction, and a Z-axis feed device (not illustrated) which reciprocatably feeds thespindle head 112 in the Z-axis direction. Themachine tool 100 further comprises a spindle motor (not illustrated) which rotatably drives thespindle 114. The spindle motor may be arranged outside or inside the housing (not illustrated) of thespindle head 112. It is preferable that the spindle motor be capable of holding thespindle 114 at predetermined angular positions around the rotation axis O by its torque. Themachine tool 100 further comprises an NC device (not illustrated) which controls the spindle motor and the three orthogonal X, Y, and Z-axis feed devices. - The
machine tool 100 preferably further comprises an automatic tool exchange device (not illustrated) for changing the tool (not illustrated) attached to the tip of thespindle 114. Thus, themachine tool 100 forms a vertical machining center, and thespindle 114 can be moved and positioned relative to the workpiece W in the three orthogonal directions of the X, Y and Z axes, and angularly positioned around the rotation axis O. - A tapered hole (not illustrated) for mounting a tool (not illustrated) is formed in the tip of the
spindle 114 of themachine tool 100. Furthermore, a central hole (not illustrated) extending along the axis O of rotation is formed in thespindle 114. A tool clamping device such as a drawbar (not illustrated) is arranged in the central hole of thespindle 114 for securing the tool mounted in the tapered hole. In the present embodiment, the tool clamping device is configured to secure an HSK-type holder, which is a type of two-sided constraint, to the tapered hole of thespindle 114. - The
belt machining device 10 is mounted in the tapered hole of thespindle 114 of themachine tool 100. Thebelt machining device 10 comprises abody part 20 and aholder part 12 which fits into the tapered hole of thespindle 114 of themachine tool 100, as shown inFIGS. 2 to 4 . The tapered hole may be a tapered hole for mounting a tool holder (not illustrated) conforming to HSK standard (DIN69893). The tapered hole may be adapted to fit the tapered portion of other shank shapes, such as a 7/24 taper shank shape. - The
holder part 12 comprises atapered part 14 which can be brought into close contact with the inner peripheral surface of the tapered hole of thespindle 114 of themachine tool 100, acylindrical extension part 16 which is coupled to thebody part 20, and aflange part 18 between theextension part 16 and theholder part 12. A circumferentially extending V-groove 18 a which is configured to engage a changer arm (not illustrated) of the automatic tool exchange device associated with themachine tool 100 is formed in theflange part 18. In the present embodiment, theholder part 12, and in particular thetapered part 14 and theflange part 18, are formed so as to conform to the HSK standard (DIN69893). As shown inFIG. 4 , theholder part 12 may be a commercially available tool holder conforming to the HSK standard (DIN69893). In this case, inside theholder part 12, acentral hole 12 a and a tool mounting hole 16 a may be formed along the central axis O1. - When the
holder part 12 has a shape conforming to the HSK standard (DIN69893), in order to clamp theholder part 12 in the tapered hole of thespindle 114, thehollow spindle 114 is provided with a clamping device comprising a drawbar (not illustrated) in the hollow interior space thereof extending along the axis of rotation O, a plurality of collets (not illustrated) arranged at equal angular intervals in the circumferential direction about the drawbar in the tapered hole, and a plurality of disc springs (not illustrated) arranged about the drawbar in the internal space of the spindle. - The drawbar of the clamping device is a hollow member forming a fluid passage through which a gas such as pressurized air or a liquid such as coolant flows. The fluid passage is connected to a fluid source (not illustrated). When the fluid to be supplied is pressurized air, the fluid source may comprise a compressor for compressing air (not illustrated), a tank for storing pressurized air (not illustrated), and a pressure regulating valve (not illustrated) installed at the outlet of the tank to adjust the pressure of the supplied pressurized air to a predetermined pressure. When the fluid to be supplied is a liquid such as coolant, the fluid source may comprise a pump (not illustrated) for pressurizing the liquid, and a pressure regulating valve (not illustrated) installed at the outlet of the pump to adjust the pressure of the liquid to be supplied to a predetermined pressure. The fluid source may be a service air system of the factory where the
machine tool 100 is installed, or a coolant supply (not illustrated) attached to themachine tool 100. - The
body part 20 comprises, as primary components, abelt drive unit 30, a rotationalpower generation unit 60, and apower transmission unit 70. Thebelt drive unit 30, rotationalpower generation unit 60, andpower transmission unit 70 are attached to aframe 22. Theframe 22 has at least abase part 24 andside wall parts 26 extending perpendicularly frombase part 24. Theside wall parts 26 extend in directions approaching the table 104 and the workpiece W affixed to the table 104 when thebelt machining device 10 is attached to the tip of thespindle 114 of themachine tool 100, as shown inFIG. 1 . In the present embodiment, thebase part 24 and theside wall parts 26 are separate members and are fastened together bybolts 24 a, but thebase part 24 and theside wall parts 26 may be integrally formed. - When a commercially available tool holder is used as the
holder part 12, thebody part 20 of thebelt machining device 10 comprises ajoint part 28 which is joined to theframe 22. Thejoint part 28 protrudes from the upper surface of thebase part 24 to the side opposite to theside wall part 26. In the present embodiment, thejoint part 28 is fastened to thebase part 24 by a plurality ofbolts 24 b. When a commercially available tool holder is not used as theholder part 12, theextension part 16 of theholder part 12 may be joined to thebase part 24 using fastening means such as bolts. - The
joint part 28 has a mating part 28 a which mates with the tool mounting hole 16 a of theholder part 12, and aflange part 28 b which is integrally coupled to the lower end of the mating part 28 a, and acentral hole 28 c which extends along a central axis O2 is formed therein. When the mating part 28 a is mated with the tool mounting hole 16 a of theholder part 12, the central axis O1 of theholder part 12 and the central axis O2 of thejoint part 28 are aligned. In the embodiment ofFIG. 4 , theholder part 12 and thejoint part 28 are formed from separate members, and thecentral hole 12 a of theholder part 12 is formed so as to open into the tool mounting hole 16 a. In the present embodiment, when the mating part 28 a is mated with the tool mounting bole 16 a of theholder part 12, thecentral hole 12 a of theholder part 12 and thecentral hole 28 c of thejoint part 28 communicate with each other to form one fluid supply passage. - When the
holder part 12 and thejoint part 28 are integrally formed, thecentral hole 12 a of theholder part 12 is formed so as to pass through theholder part 12 along the central axis O1. In this case, thecentral hole 12 a of theholder part 12 forms the fluid supply passage. The fluid supply passage communicates with the fluid passage formed in the drawbar of the clamping device when theholder part 12 is clamped in the tapered hole of thespindle 114. - A
belt drive unit 30 is attached to theside wall part 26 of theframe 22. Thebelt drive unit 30 comprises afirst roller 40 and asecond roller 32, between which amachining belt 34 is stretched. Themachining belt 34 is formed in an endless shape by joining both ends of a base material such as a cloth to which an abrasive is adhered. The grain size of the abrasive to be adhered may be appropriately determined in accordance with the surface roughness required for polishing or grinding to perform. - The
first roller 40 is rotatably supported by theside wall part 26 and abracket 36 attached to theside wall part 26. More specifically, thefirst roller 40 is attached to arotating shaft 38 which is rotatably supported by theside wall part 26 and thebracket 36 bybearings first roller 40 and the outer peripheral surface of therotating shaft 38 is arranged between thefirst roller 40 and therotating shaft 38, whereby thefirst roller 40 may be prevented from rotating relative to therotating shaft 38. When thefirst roller 40 is attached to theside wall part 26 and thebracket 36, the outer peripheral surface of thefirst roller 40 protrudes from theside wall part 26 in the central axis O1 direction. - The
first roller 40 comprises acylindrical roller body 42, at least oneelastic ring 44 as an elastic body fitted to the outer peripheral surface of theroller body 42, and an end plate 48. Theroller body 42 has a central hole 42 a through which therotating shaft 38 passes. An axially extendinggroove 42 b through which the key 38 a passes may be formed in the inner peripheral surface of theroller body 42. One end of theroller body 42 is provided with a radially protrudingflange part 42 c which prevents detachment of theelastic ring 44. Arecess 42 d for receiving the end plate 48 is formed at the other end of theroller body 42. - The
elastic ring 44 is an annular member which is attached to the outer peripheral surface of theroller body 42 and which is composed of an elastic material such as foamed rubber, for example, a fluororubber sponge. Theelastic ring 44 has a slit 44 a extending in the circumferential direction and an innerperipheral surface 44 b in close contact with the outer peripheral surface of theroller body 42. Theslit 44 a is formed at a predetermined axial width (axial dimension) and a predetermined radial depth from the outer peripheral surface of theelastic ring 44. Theslit 44 a may be a simple cut which is cut radially from the outer peripheral surface to a predetermined depth. - An
expansion prevention member 46 is fitted into theslit 44 a to prevent radial expansion and deformation of theelastic ring 44 due to centrifugal force when thefirst roller 40 rotates. Theexpansion prevention member 46 may be an annular member composed of a material having an elastic modulus greater than that of theelastic ring 44 as the elastic body, such as a thin resin plate. Alternatively, theexpansion prevention member 46 may be two arcuate members obtained by diametrically dividing the annular member into two or three arcuate members obtained by dividing the annular member in three so that the central angle is 120°. If theexpansion prevention member 46 comes into contact with themachining belt 34, the tension of themachining belt 34 is adversely affected. Therefore, the outer diameter of theexpansion prevention member 46 is preferably smaller than the outer diameter of theelastic ring 44 during both machining and non-machining. - The end plate 48 has a
cylindrical body part 48 a and a radially projectingflange part 48 b at one end of thebody part 48 a. Acentral hole 48 c through which therotating shaft 38 passes is formed in the end plate 48. When the end plate 48 is fitted into therecess 42 d of theroller body 42, theelastic ring 44 fitted to the outer peripheral surface of theroller body 42 is interposed between theflange part 42 c of theroller body 42 and theflange part 48 b of the end plate 48. As a result, theelastic ring 44 is prevented from axially moving and detaching from theroller body 42. - The
second roller 32 is attached to arotating shaft 52 which is rotatably supported by aU-shaped cradle 50. Thecradle 50 is provided so as to be movable in the direction indicated by arrow A along aguide 59. A stud 54 is affixed to thebracket 36 and inserted into a hole (not illustrated) of thecradle 50 with a gap therebetween. A coil spring 56 is arranged around the stud 54. Thecradle 50 is biased away from thebracket 36 by the coil spring 56. Thecradle 50 may be affixed at an arbitrary distance from thebracket 36 by apin 58 serving as an affixation mechanism. Specifically, by threading thepin 58 through thecradle 50 so that the tip of thepin 58 contacts the outer periphery of the stud 54 inserted into thecradle 50, the position of thecradle 50 can be secured by rotating thepin 58. In the machining belt replacement operations, when removing the machining belt, first, thepin 58 is released, thecradle 50 is moved along theguide 59 toward thebracket 36, thepin 58 is affixed, and the tension of themachining belt 34 is released, whereby themachining belt 34 can be removed from thefirst roller 40 and thesecond roller 32. When installing themachining belt 34, in a state in which themachining belt 34 is removed, when the newly installedmachining belt 34 is attached to thefirst roller 40 and thesecond roller 32 and the affixation of thepin 58 is released, since thecradle 50 is separated from thebracket 36 by the elastic force of the coil spring 56 and themachining belt 34 is stretched, by securing the position of thecradle 50 with thepin 58, the mounting of themachining belt 34 is completed. With these structures and operation procedures, the tension of themachining belt 34 can be set while performing the belt replacement operation regardless of the skill level of the operator. - The rotational
power generation unit 60 comprises a rotary motor. Though the rotary motor may be an electric motor, it is preferably a fluid motor, and in particular, a pneumatic motor with a turbine (not illustrated). The pneumatic motor as the rotationalpower generation unit 60 has aturbine housing 62 defining acasing 64 that rotatably houses the turbine and afluid inlet port 66 which communicates with thecasing 64. Thefluid inlet port 66 communicates with the fluid supply passage. In the present embodiment, thefluid inlet port 66 communicates withcentral holes holder part 12 and thejoint part 28. - The
power transmission unit 70 comprises afirst pulley 72, asecond pulley 74, adrive belt 76 stretched between thefirst pulley 72 and thesecond pulley 74, and atensioner 78. Thefirst pulley 72 is mounted on an output shaft 68 for rotation with the output shaft 68 of the pneumatic motor as the rotationalpower generation unit 60 and forms an input pulley. Thesecond pulley 74 is mounted on therotating shaft 38 for rotation with the rotatingshaft 38 for thefirst roller 40. Thedrive belt 76 may be a toothed belt or a cog belt. When thedrive belt 76 is a toothed or cog belt, thefirst pulley 72 and thesecond pulley 74 are constituted by toothed pulleys having a plurality of teeth which engage the teeth of thedrive belt 76. Thedrive belt 76 is under constant tension between thefirst pulley 72 and thesecond pulley 74 by thetensioner 78, which has a freewheelingroller 78 a which engages the back of thedrive belt 76. - When the
belt machining device 10 is clamped into the tapered hole of thespindle 114 of themachine tool 100, thefluid supply passages 12 a. 28 c communicate with the fluid passage of the drawbar of the clamping device. The fluid from the fluid supply source, such as pressurized air or coolant, is supplied to thecasing 64 through the fluid passage of the drawbar of the tool clamping device of the spindle, thefluid supply passages 12 a, 28 e of thebelt machining device 10, and thefluid inlet port 66 of the fluid motor as the rotationalpower generation unit 60, and rotates the turbine disposed in thecasing 64. - This rotation is transmitted to the
rotating shaft 38 through thefirst pulley 72 attached to the output shaft 68 of the fluid motor, thedrive belt 76, and thesecond pulley 74, whereby thefirst roller 40, which is a machining roller, rotates, and themachining belt 34 stretched between thefirst roller 40 and thesecond roller 32 is driven. During this time, thefirst roller 40 serves as the driving roller and thesecond roller 32 as the driven roller. Thus, while themachining belt 34 is driven to circulate between thefirst roller 40 and thesecond roller 32, the surface of workpiece W is machined (grinded or polished) by the relative movement of thespindle 114 and the table 104 while thefirst roller 40 is pressed against the surface of workpiece W with themachining belt 34 interposed therebetween. - By disposing the
elastic ring 44, which is an elastic body, on the outer peripheral part of thefirst roller 40, which is a machining roller, the elastic body can compensate for poor mounting alignment of the machining roller and undulation of the surface of the workpiece to be machined, which are problematic for machining, whereby it is possible to obtain a suitable machined surface without creating a special program by merely running the belt machining device along the surface to be machined of the workpiece W in accordance with the machine program (NC program) matching the design shape. Theexpansion prevention member 46 is embedded in theelastic ring 44 to prevent radial expansion and deformation of theelastic ring 44 due to centrifugal force during rotation of thefirst roller 40. Specifically, the problem in that unintended tension is applied to themachining belt 34, which adversely affects the machining of the workpiece W, and the problem in that theelastic ring 44 expands in portions which are not engaged with themachining belt 34, which interferes with various parts of thebody part 20, can be solved by theexpansion prevention member 46. - In the embodiment described above, the
expansion prevention member 46 comprises an annular member, two arcuate members, or three arcuate members composed of, for example, a resin thin plate, and is disposed in theslit 44 a of theelastic ring 44, which is formed with a predetermined width (axial dimension) in the axial direction and a predetermined depth in the radial direction from the outer peripheral surface of the ring and which extends in the circumferential direction, but the present invention is not limited thereto. In the present invention, it is sufficient that the expansion prevention member be able to prevent the radial expansion and deformation of the elastic body provided on the outer periphery of the machining roller due to centrifugal force during rotation of the machining roller. -
FIG. 7 shows afirst roller 120, which is a modified example of a machining roller. Thefirst roller 120 of the present embodiment has substantially the same configuration as thefirst roller 40 in the embodiment described above, except that the elastic ring as an elastic body and the expansion prevention member are different from theexpansion prevention member 46 in the above embodiment. - In
FIG. 7 ,elastic rings 124 haveslits 124 a extending in the circumferential direction. Theslits 124 a are formed at predetermined depths from two axially opposite side surfaces of theelastic rings 124 and predetermined radial widths (radial dimensions).Expansion prevention members slits 124 a to prevent radial expansion and deformation of theelastic rings 124 due to centrifugal force generated by the rotation of thefirst roller 120. - The
expansion prevention members expansion prevention members expansion prevention member 126 a is arranged inslit 128 d of theflange part 128 b of theend plate 128 and slit 124 a formed in the side of theelastic ring 124 facing theslit 128 d,expansion prevention members 126 b are arranged inslits 124 a on opposite sides of the twoelastic rings 124, and expansion prevention member 126 c is arranged is slit 122 e offlange part 122 c ofroller body 122 and slit 124 a formed in the side of theelastic ring 124 facing theslit 122 e. - The
first roller 120 ofFIG. 7 also severs in the same manner as thefirst roller 40 in the embodiment described above. - Since the
spindle 114 can be moved and positioned relative to the workpiece W in the three orthogonal X-axis, Y-axis, and Z-axis directions, and can be angularly positioned about the rotation axis O, according to themachine tool 100 and thebelt machining device 10, belt machining can be performed on the workpiece W to form a polished surface or a ground surface having polishing or grinding marks parallel to the tool feed direction, which is suitable for a precision sealing surface provided in a vacuum chamber or the like. By providing themachine tool 100 with a tool exchange device, machining processes other than polishing or grinding performed by thebelt machining device 10 can be integrated into the machining process performed by themachine tool 100. Further, by applying a fluid motor or a pneumatic motor to the rotary motor, thebelt machining device 10 can be driven by the fluid supply source originally provided in themachine tool 100 to supply the coolant and pressurized air for lubrication and cooling, whereby there is no need to provide a new drive source for thebelt machining device 10. - In the contents described above, an embodiment in which one or two expansion prevention members are attached to one elastic ring was described, but for example, when it is desired to prevent the expansion of the elastic ring due to centrifugal force more strongly, a configuration in which a large number of expansion prevention members can be attached may be adopted as needed.
-
-
- 10 Belt Machining Device
- 12 Holder Part
- 20 Body Part
- 30 Belt Drive Unit
- 32 Second Roller
- 34 Machining Belt
- 40 First Roller
- 44 Elastic Ring
- 46 Expansion Prevention Member
- 58 Pin
- 60 Rotational Power Generation Unit
- 70 Power Transmission Unit
- 100 Machine Tool
Claims (5)
1. A belt machining device, which moves a machining belt relative to a workpiece to machine the workpiece, the belt machining device comprising:
a first roller, which is a machining roller,
a second roller,
a machining belt which is supported by the first roller and the second roller,
a rotational power generation unit which rotates the first roller or the second roller,
an annular elastic body which is attached to an outer circumference of the first roller, and
an annular expansion prevention member which is attached to the elastic body and which has an elastic modulus greater than the elastic body.
2. The belt machining device according to claim 1 , wherein a portion of the machining belt which engages with the first roller contacts a surface of the workpiece to machine the surface of the workpiece.
3. The belt machining device according to claim 1 , wherein the rotational power generation unit comprises a fluid motor.
4. The belt machining device according to claim 3 , wherein the fluid motor is a pneumatic motor.
5. The belt machining device according to claim 1 , further comprising a holder part which can be attached to a tip of a spindle of a machine tool comprising a spindle, a table which is arranged to face the spindle and to which a workpiece is attached, and a feed device which moves the spindle and the table relative to each other.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-061326 | 2021-03-31 | ||
JP2021061326A JP7142123B1 (en) | 2021-03-31 | 2021-03-31 | belt processing equipment |
PCT/JP2022/016832 WO2022211085A1 (en) | 2021-03-31 | 2022-03-31 | Belt processing device |
Publications (1)
Publication Number | Publication Date |
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US20240189957A1 true US20240189957A1 (en) | 2024-06-13 |
Family
ID=83400860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/553,050 Pending US20240189957A1 (en) | 2021-03-31 | 2022-03-31 | Belt processing device |
Country Status (7)
Country | Link |
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US (1) | US20240189957A1 (en) |
EP (1) | EP4316733A1 (en) |
JP (1) | JP7142123B1 (en) |
KR (1) | KR20230121148A (en) |
CN (1) | CN116847947A (en) |
TW (1) | TWI812137B (en) |
WO (1) | WO2022211085A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2342831C3 (en) * | 1973-08-24 | 1978-04-27 | Ing. Schnuer Und Haller Ohg, 7000 Stuttgart | Contact disc for belt grinding machines |
JPH0829490B2 (en) * | 1986-06-30 | 1996-03-27 | 安栄 大道寺 | Belt grinding machine |
JPH04203654A (en) * | 1990-11-30 | 1992-07-24 | Mitsubishi Materials Corp | Outer diameter expanding rotator |
JPH0866864A (en) * | 1994-08-30 | 1996-03-12 | Soken Kogyo Kk | Constant-pressure pressing mechanism for polishing device |
SE513721C2 (en) * | 1997-04-25 | 2000-10-30 | Oerebro Golvindustri Ab | Floor grinding machine with a drum with interchangeable units |
JP3000449B2 (en) * | 1998-04-30 | 2000-01-17 | 東京バフ株式会社 | Contact wheel for abrasive belt |
JP2002370149A (en) * | 2001-06-19 | 2002-12-24 | Nkk Corp | Belt-type grinding device |
JP2004009189A (en) * | 2002-06-05 | 2004-01-15 | Makoto Ueno | Polishing tool and polishing member |
CN2850816Y (en) * | 2005-04-30 | 2006-12-27 | 陈新民 | Rubber polishing wheel |
JP6755378B1 (en) * | 2019-03-28 | 2020-09-16 | 住友化学株式会社 | Target material polishing method, target material manufacturing method, and recycled ingot manufacturing method |
JP6715986B1 (en) * | 2019-03-29 | 2020-07-01 | 株式会社牧野フライス製作所 | Belt polishing tool |
-
2021
- 2021-03-31 JP JP2021061326A patent/JP7142123B1/en active Active
-
2022
- 2022-03-31 US US18/553,050 patent/US20240189957A1/en active Pending
- 2022-03-31 TW TW111112619A patent/TWI812137B/en active
- 2022-03-31 CN CN202280015222.3A patent/CN116847947A/en active Pending
- 2022-03-31 KR KR1020237025484A patent/KR20230121148A/en unknown
- 2022-03-31 EP EP22781294.8A patent/EP4316733A1/en active Pending
- 2022-03-31 WO PCT/JP2022/016832 patent/WO2022211085A1/en active Application Filing
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TW202243799A (en) | 2022-11-16 |
WO2022211085A1 (en) | 2022-10-06 |
JP2022157222A (en) | 2022-10-14 |
JP7142123B1 (en) | 2022-09-26 |
EP4316733A1 (en) | 2024-02-07 |
TWI812137B (en) | 2023-08-11 |
CN116847947A (en) | 2023-10-03 |
KR20230121148A (en) | 2023-08-17 |
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