US20160016293A1 - Linear grinding member, brush-like grinding stone, and method for manufacturing linear grinding member - Google Patents

Linear grinding member, brush-like grinding stone, and method for manufacturing linear grinding member Download PDF

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Publication number
US20160016293A1
US20160016293A1 US14/773,307 US201414773307A US2016016293A1 US 20160016293 A1 US20160016293 A1 US 20160016293A1 US 201414773307 A US201414773307 A US 201414773307A US 2016016293 A1 US2016016293 A1 US 2016016293A1
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United States
Prior art keywords
linear grinding
grinding member
linear
composite yarn
sectional shape
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Abandoned
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US14/773,307
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English (en)
Inventor
Suguru Matsushita
Mitsuhisa AKASHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xebec Technology Co Ltd
Taimei Chemicals Co Ltd
Original Assignee
Xebec Technology Co Ltd
Taimei Chemicals Co Ltd
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Assigned to XEBEC TECHNOLOGY CO., LTD., TAIMEI CHEMICALS CO., LTD. reassignment XEBEC TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AKASHI, MITSUHISA, MATSUSHITA, SUGURU
Publication of US20160016293A1 publication Critical patent/US20160016293A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • B24D13/145—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face having a brush-like working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0027—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/30—Brushes for cleaning or polishing
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/30—Brushes for cleaning or polishing
    • A46B2200/3093—Brush with abrasive properties, e.g. wire bristles

Definitions

  • Patent Literatures 1 and 2 disclose brush-like grinding stones each including a plurality of linear grinding members, and a holder that holds these linear grinding members in a bundle. When each of these brush-like grinding stones is used, for example, for deburring or polishing a surface of a metal workpiece, the tips of the linear grinding members grind or polish the surface while the brush-like grinding stone is rotated about the axis thereof, Patent Literature 1 discloses, as a method for manufacturing a linear grinding member, a method including: impregnating a composite yarn including inorganic filaments and a resin binder; then winding it up while removing excess resin with a squeezing roller; and then thermally curing the resin binder.
  • Patent Literature 1 Japanese Patent Laid-open Publication No. 2002-210662
  • Patent Literature 2 WO2004/009293
  • Patent Literature 1 when a composite yarn including inorganic filaments is driven while being placed on a roller or the like, the composite yarn is moderately pressed against the roller. As a result, the cross section of the composite yarn is formed into a circular shape. Thus, a linear grinding member having a circular cross section is manufactured.
  • the present invention provides a linear grinding member obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments, where the linear grinding member has a square, rectangular, or elliptical cross-sectional shape.
  • a linear grinding member having a square cross-sectional shape according to the present invention is hard to bend and firm because the cross section thereof has the same dimension in the lateral and longitudinal directions.
  • a linear grinding member having a square cross-sectional shape has an edge effect because it is harder to bend in the diagonal directions of the cross section than in the lateral and longitudinal directions thereof.
  • a linear grinding member having a square cross-sectional shape has excellent grindability.
  • a linear grinding member having a rectangular cross-sectional shape has a cross section thinner in the thickness direction than in the width direction (a direction along the long sides). Therefore, the tip thereof easily breaks, and the self-sharpening action for generating a new cutting edge is active. Thus, such a linear grinding member can maintain grinding performance.
  • a linear grinding member having a rectangular cross-sectional shape also has an edge effect because it is hard to bend in a direction along the long sides and the diagonal directions of the cross section. Furthermore, a linear grinding member having a rectangular cross-sectional shape has different degrees of easiness to bend in the thickness direction and width direction of the cross-section, and consequently makes irregular motions during processing. Thus, a linear grinding member having a rectangular cross-sectional shape provides increased grinding performance because it makes irregular motions and has an edge effect at the same time. Also in the present invention, a linear grinding member having an elliptical cross-sectional shape has a cross section thinner in the thickness direction than in the width direction (a direction along the major axis).
  • a linear grinding member having an elliptical cross-sectional shape also has an edge effect because it is hard to bend in a direction along the major axis of the cross section. Furthermore, a linear grinding member having an elliptical cross-sectional shape has different degrees of easiness to bend in the thickness direction and width direction of the cross-section, and consequently makes irregular motions during processing. Thus, a linear grinding member having an elliptical cross-sectional shape provides increased grinding performance because it makes irregular motions and has an edge effect at the same time. Note that, during processing of a workpiece, the tip of a linear grinding member provides a process similar to grinding. For this reason, “polishing” and “grinding” are used without distinction therebetween in the present specification.
  • the composite yarn may have been twisted. With the composite yarn appropriately twisted, longitudinal cracks (cracks in the lengthwise direction of the linear grinding member) in the linear grinding member can be prevented, and impactive wear can be prevented.
  • the present invention may employ a linear grinding member having a square cross-sectional shape and having a length dimension of the linear grinding member corresponding to one turn of twisting set in the range of 1 cm to 4 cm.
  • the length dimension of the linear grinding member corresponding to one turn of twisting set to 4 cm or less the effect of preventing a longitudinal crack in the linear grinding member can be obtained.
  • the length dimension of the linear grinding member corresponding to one turn of twisting set to 1 cm or more the inorganic filaments can be prevented from fuzzing because of the twisting.
  • a length dimension of the linear grinding member corresponding to one turn of twisting may be set in the range of 1 cm to 4 cm when the aspect ratio is in the range of 1.1 to 1.9, and may be set in the range of 10 cm to 20 cm when the aspect ratio is in the range of 2.0 to 5.0.
  • the aspect ratio is set in the range of 1.1 to 1.9, the effect of preventing longitudinal cracks of the linear grinding member can be obtained with the length dimension of the linear grinding member corresponding to one turn of twisting set to 4 cm or less.
  • the inorganic filaments can be prevented from fuzzing because of the twisting.
  • the aspect ratio is in the range of 2.0 to 5.0, the effect of preventing longitudinal cracks of the linear grinding member can be obtained with the length dimension of the linear grinding member corresponding to one turn of twisting set to 20 cm or less, even for the linear grinding member that has a large aspect ratio of 2.0 or higher.
  • the inorganic filaments can be prevented from fuzzing because of the twisting, even for the linear grinding member that has a large aspect ratio of 2.0 or higher.
  • a brush-like grinding stone includes: a plurality of linear grinding members; a holder that holds the plurality of linear grinding members in the form of a bundle.
  • each of the linear grinding members is obtained by stiffening a composite yarn including inorganic filaments, and each of the linear grinding members has a square, rectangular, or elliptical cross-sectional shape.
  • each of the multiple linear grinding members has an edge effect, and provides high grinding performance, which makes it easier to process a workpiece with the brush-like grinding stone.
  • the present invention provides a method of manufacturing a linear grinding member obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments.
  • the method includes: an impregnation step of impregnating the composite yarn with an uncured resin binder; a shaping step of passing the composite yarn impregnated with the resin binder through a die to shape the cross-sectional shape of the composite yarn into a square, rectangle, or ellipse; and a resin-curing step of curing the resin binder after the shaping step or in parallel with the shaping step.
  • the shaping step of passing the composite yarn impregnated with the resin binder through a die to shape the cross-sectional shape of the composite yarn is performed after the composite yarn is impregnated with the uncured resin binder in the impregnation step, and before or in parallel with the resin binder is cured in the resin-curing step.
  • the cross-sectional shape of the linear grinding member can be easily controlled.
  • a twisting step of twisting the composite yarn may be performed before the impregnation step.
  • This step causes the inorganic filaments in the composite yarn to tangle together as a result of the twisting of the composite yarn, thereby making it easier to control the cross-sectional shape of the linear grinding member than in a case where the inorganic filaments extend parallel to one another.
  • Appropriately twisting the composite yarn can prevent longitudinal cracks in the linear grinding member (cracks in the lengthwise direction of the linear grinding member), and can prevent impactive wear.
  • Another aspect of the present invention provides a method of manufacturing a linear grinding member obtained by stiffening, with a resin binder, a composite yarn including inorganic filaments.
  • the method includes: an impregnation step of impregnating the composite yarn with an uncured resin binder; a resin-curing step of curing the resin binder; and a polishing shaping step of polishing the outer peripheral surface of the composite yarn to shape the cross-sectional shape of the composite yarn into a square, rectangle, or ellipse.
  • polishing the outer peripheral surface of the composite yarn makes it easier to shape the cross-sectional shape of the linear grinding member.
  • FIG. 1 is an illustration of a brush-like grinding stone according to a first example of the present invention.
  • FIG. 2 is an illustration of a brush-like grinding stone according to a second example of the present invention.
  • FIG. 4 is an illustration schematically depicting a linear grinding member of the first example according to the present invention.
  • FIG. 5 is an illustration of twisting of a composite yarn for a linear grinding member.
  • FIG. 6 is an illustration schematically depicting a linear grinding member of the second example according to the present invention.
  • FIG. 8 is an illustration depicting a method for manufacturing a linear grinding member of the first example according to the present invention.
  • FIG. 1 is an illustration of a brush-like grinding stone according to a first example of the present invention.
  • a polishing machine brush 10 illustrated in FIG. 1 is a tool for, for example, deburring and polishing a surface of a metal workpiece, and includes: a brush-like grinding stone 1 ; a brush case 2 that holds this brush-like grinding stone 1 ; and a fixing screw 3 for fixing the brush-like grinding stone 1 to the brush case 2 .
  • the brush-like grinding stone 1 includes: a plurality of linear grinding members 11 ; and a holder 12 that holds respective base-end parts of the linear grinding members 11 .
  • the plurality of linear grinding members 11 are held by the holder 12 in the form of a plurality of bundles 110 each includes the multiple linear grinding members 11 .
  • the bundles 110 are arranged at uniform angle intervals around the rotational center axis line L of the polishing machine brush 10 .
  • the linear grinding member 11 is obtained by impregnating a collection of inorganic filaments with binder resin and then forming the conglomerate into a linear shape.
  • the inorganic filaments include alumina fiber filaments.
  • the binder resin include: thermosetting resin such as epoxy resin and phenolic resin; silicone resin; and thermoplastic resin such as polyester resin, polypropylene resin, and polyamide resin.
  • a composite yarn is obtained by gathering, for example, 250 to 3000 alumina fiber filaments (inorganic filaments) each having a filament diameter of 8 to 50 ⁇ m. The diameter of the composite yarn is 0.1 mm to 2 mm.
  • the linear grinding member 11 has a diameter equal to that of the composite yarn, which is 0.1 mm to 2 mm.
  • the holder 12 is made of metal or resin, and has a columnar outer shape. Alternatively, the holder 12 may have an outer shape like a quadrangle prism. At one end side of the holder 12 , a cylindrical grinding material holding portion 12 a that opens in the axis line direction is formed. The base end sections of the bundles 100 of the linear grinding members 11 are inserted into the grinding material holding portion 12 a , and are glued and fixed thereto, whereby the linear grinding member 11 and the holder 12 are integrally joined together.
  • the polishing machine brush 10 is driven so as to rotate about the rotational center axis line L.
  • the movement thereof is not limited to rotation, and may be a reciprocating movement, an oscillation movement, swinging, or a combination of any ones of these movements may be made.
  • one opening section 21 a is formed in the circumferential wall part 21 of the brush case 2 .
  • the opening section 21 a is formed like a slotted hole and extends in the axial direction.
  • the inner circumferential surface of the circumferential wall part 21 has a flat surface (not illustrated) formed on a region thereof opposite to the opening section 21 a across the rotational center axis line L. The flat surface extends in the axial direction.
  • the circumferential wall part 21 also has a thin-walled section 21 c having a smaller thickness than the other portion thereof.
  • This thin-walled section 21 c has a shape obtained by thinly and flatly scraping a part of the outer circumferential surface of the circumferential wall part 21 for a predetermined length in the axial direction.
  • two thin-walled sections 21 c are formed on opposite sides of a position that is opposite from the opening section 21 a across the rotational center axis line L. Consequently, the center of gravity of the brush case 2 is located on the rotational center axis line L because the circumferential wall part 21 has the two thin-walled sections 21 c and the flat surface formed thereon while having the opening section 21 a formed therein.
  • a screw hole 12 b is drilled therethrough passing the rotational center axis line L and perpendicularly to the rotational center axis line L.
  • the screw hole 12 b is a part to which fixing screw 3 is fixed by being screwed thereinto when the brush-like grinding stone 1 is assembled to the brush case 2 .
  • a hexagon socket set screw is used as the fixing screw 3
  • the fixing screw 3 has a hexagon socket 31 formed on an end thereof.
  • the hexagon socket 31 is a part into which the head of a hexagon wrench 5 is fitted.
  • the brush-like grinding stone 1 and the polishing machine brush 10 which are thus structured, are rotated about the rotational center axis line L with the tips of the linear grinding members 11 pressed against a workpiece, thereby removing burrs generated during molding or processing, or polishing the surface of the workpiece.
  • the workpiece is, for example, a magnesium or aluminum die-cast product. Otherwise, the workpiece may be a steel member processed with such a tool as an end mill, a drill, a die, or a tap.
  • the position thereof is circumferentially adjusted during the sliding so that the opening of the screw hole 12 b of the holder 12 can be seen through the opening section 21 a formed in the brush case 2 .
  • access to the screw hole 12 b provided in the holder 12 is allowed through the opening section 21 a.
  • the fixing screw 3 is screwed into the screw hole 12 b through the opening section 21 a , and tightened up in a direction from the opening section 21 a toward a deeper part of the screw hole 12 b .
  • the fixing screw 3 is a hexagon socket set screw, and is tightened up until it is completely buried inside the screw hole 12 b .
  • the front end portion 30 of the fixing screw 3 slightly projects from the screw hole 12 b , and abuts on the flat surface formed on the inner circumferential surface of the brush case 2 .
  • the fixing screw 3 and the holder 12 are pressed to each other in the inside of the circumferential wall part 21 of the brush case 2 and in the radial direction thereof, so that the holder 12 is pressed and immobilized against the inner circumferential surface of the opening section 21 a of the circumferential wall part 21 .
  • the base end section of the fixing screw 3 has been embedded in the screw hole 12 b , and the fixing screw 3 does not at all project from the outer circumferential surface of the circumferential wall part 21 .
  • the polishing machine brush 10 thus having the brush-like grinding stone 1 completely fixed to the brush case 2 is used for polishing, the tip portions of the linear grinding members 11 are worn, and the projection dimension of the linear grinding members 11 is reduced.
  • the fixing screw 3 is eased, and the holder 12 is then moved in the axial direction, so that the projection dimension of the linear grinding members 11 is adjusted to an appropriate dimension, which is, for example, several millimeters to several tens of centimeters.
  • the fixing screw 3 is then tightened up again, so that the holder 12 is immobilized inside the brush case 2 .
  • FIG. 2 is an illustration of a brush-like grinding stone according to a second example of the present invention. Note that the basic structure of a polishing machine brush of this example is the same as in the mode illustrated in FIG. 1 . Hence, common reference signs are given to common components and descriptions thereof are omitted.
  • the linear grinding members 11 are held by the holder 12 in the form of the bundles 110 in the brush-like grinding stone 1 according to the first example, a plurality of linear grinding members 11 is held by the holder 12 in the form of a single bundle 110 in this embodiment as illustrated in FIG. 2 .
  • the brush-like grinding stone 1 and the polishing machine brush 10 that are thus structured are also rotated about the rotational center axis line L with the tips of the linear grinding members 11 pressed against a workpiece, thereby being used to remove burrs generated during molding or processing, or polish the surface of the workpiece.
  • FIG. 3 is an illustration of a brush-like grinding stone according to a third example of the present invention. Note that the basic structure of a polishing machine brush of this example is the same as in the mode illustrated in FIG. 1 . Hence, common reference signs are given to common components and descriptions thereof are omitted.
  • the brush-like grinding stone 1 illustrated in FIG. 3 is a tool for removing burrs inside cross-holes, and includes a plurality of linear grinding members 11 held in the form of a bundle 110 by the holder 12 .
  • the holder 12 includes a driving connecting shaft 120 formed thereon that is extended in the rotational center axis line L, and the driving connecting shaft 120 is coupled to an electric-powered rotation driving apparatus or the like. Additionally, a portion extending from the holder 12 to the base of the bundle 110 of the linear grinding members 11 is covered with a heat-shrinkable tube 40 .
  • the thus structured brush-like grinding stone 1 is used by having the bundle 110 of the linear grinding members 11 inserted into a cross-hole from the tip side thereof, and having the brush-like grinding stone 1 rotated about the rotational center axis line L while the above state is maintained. As a result, the linear grinding members 11 are widened radially outward, thereby being enabled to remove burrs generated in the cross-hole.
  • FIG. 4 is an illustration schematically depicting a structure of each of the linear grinding members 11 of the first example to which the present invention is applied.
  • FIG. 5 is an illustration that depicts a twisted state of a composite yarn included in the linear grinding member 11 , where two inorganic filaments of the inorganic filaments composing the composite yarn are illustrated as a solid line and a two-dot chain line.
  • FIG. 6 is an illustration schematically depicting a structure of each of the linear grinding members 11 of the second example to which the present invention is applied.
  • FIG. 7 is an illustration schematically depicting a structure of each of the linear grinding members 11 of the third example to which the present invention is applied. Note that, in illustrating the cross sections of composite yarns 15 and the linear grinding members 11 with the inorganic filaments represented by respective circles 150 in FIG. 4 , FIG. 6 , and FIG. 7 , the inorganic filaments are enlarged more than the composite yarns 15 and the linear grinding members 11 , and the numbers thereof are illustratively smaller correspondingly. Although some of the circles 150 representing the inorganic filaments are therefore illustrated as being chipped off, there are no chipped-off inorganic filaments in the composite yarns 15 and the linear grinding members 11 .
  • a linear grinding member 11 A having a square cross-sectional shape as illustrated as the first example, a linear grinding member 11 B having a rectangular cross-sectional shape as illustrated as the second example, or a linear grinding member 11 C having an elliptical cross-sectional shape as illustrated as the third example is used.
  • the linear grinding member 11 A in this example has a square cross-sectional shape in a direction perpendicular to the axis line thereof.
  • the linear grinding member 11 A of this example is hard to bend and firm because of having the same dimension in the X and Y directions of the cross section. Hence, the linear grinding member 11 A is suitable for polishing a surface with few irregularities, and a surface with no irregularities. Additionally, the linear grinding member 11 A exhibits sufficiently high firmness when the projection dimension is long, therefore being suitable for removing burrs inside a cross-hole, which requires high firmness. Furthermore, since the linear grinding member 11 A has the same level of easiness to bend in the X and Y directions of the cross section, the linear grinding member 11 A makes regular motions during processing. Consequently, using the linear grinding member 11 A enables processing to be less prone to scratches and to provide fine finish surface roughness. Thus, the linear grinding member 11 A is suitable for polishing, for example, surfaces for which finish surface roughness is important.
  • the linear grinding member 11 A exerts an edge effect because it is hard to bend in the diagonal directions.
  • the linear grinding member 11 A exerts a high edge effect because it has right-angled corners.
  • the linear grinding member 11 A has excellent grindability.
  • the composite yarn 15 in the linear grinding member 11 A may have been twisted.
  • the composite yarn 15 in the linear grinding member 11 A is twisted in such a manner that a length dimension S of the linear grinding member 11 A corresponding to one turn of twisting is in the range of 1 cm to 4 cm.
  • the length dimension S of the linear grinding member 11 A corresponding to one turn of twisting set to 4 cm or less, the effect of preventing longitudinal cracks of the linear grinding member 11 A can be obtained.
  • the length dimension S of the linear grinding member 11 A corresponding to one turn of twisting set to 1 cm or more the inorganic filaments can be prevented from fuzzing because of the twisting.
  • the linear grinding member 11 B in this example has a rectangular cross-sectional shape in a direction perpendicular to the axis line thereof.
  • a dimension in the thickness direction T (a direction along the short sides) is smaller than a dimension in the width direction W (a direction along the long sides).
  • the linear grinding member 11 B is easy to bend in the thickness direction T, and is hard to break off.
  • the linear grinding member 11 B is suitable for deburring, for example, a surface having a lot of irregularities on a surface to be processed.
  • the linear grinding member 11 B has a cross section thinner in the thickness direction than in the width direction. Therefore, the tip thereof easily breaks, and the self-sharpening action for generating a new cutting edge is active. Furthermore, clogging is unlikely to occur because the linear grinding member 11 B is thin.
  • An aspect ratio (a value obtained by dividing a dimension in the width direction W by a dimension in the thickness direction T) of the linear grinding member 11 B is in the range of 1.1 to 5.0. More specifically, it has been found that, when having an aspect ratio in the range of 1.1 to 5.0, the linear grinding member 11 B is less likely to bend in a direction along the long sides of the cross section and exerts an edge effect.
  • the aspect ratio set in the range of 2.0 to 5.0 is highly effective for the activeness of the self-sharpening action, the degree of clogging prevention, the irregularity of motions during processing, and the edge effect.
  • the aspect ratio set in the range of 1.1 to 1.9 slightly reduces the activity level of the self-sharpening action and the degree clogging prevention; however, it results in relatively regular motions during processing, so that a surface finished with fine surface roughness is obtained.
  • the surface roughness of a workpiece after processing tends to be rougher when processing efficiency is increased with the aspect ratio increased, and tends to be finer when processing efficiency is decreased with the aspect ratio decreased.
  • the composite yarn 15 in the linear grinding member 11 B may have been twisted.
  • the aspect ratio of the linear grinding member 11 B is in the range of 1.1 to 1.9
  • the composite yarn 15 is twisted in such a manner that a length dimension S of the linear grinding member 11 B corresponding to one turn of twisting is in the range of 1 cm to 4 cm.
  • the length dimension S of the linear grinding member 11 B corresponding to one turn of twisting set to 4 cm or less, the effect of preventing longitudinal cracks of the linear grinding member 11 B can be obtained.
  • the length dimension S of the linear grinding member 11 B corresponding to one turn of twisting set to 1 cm or more the inorganic filaments can be prevented from fuzzing because of the twisting.
  • the length dimension S of the linear grinding member 11 B corresponding to one turn of twisting is set in the range of 10 cm to 20 cm.
  • the length dimension S of the linear grinding member 11 B corresponding to one turn of twisting set to 20 cm or less, the effect of preventing longitudinal cracks of the linear grinding member 11 B can be obtained.
  • the length dimension S of the linear grinding member 11 B corresponding to one turn of twisting set to 10 cm or more the inorganic filaments can be prevented from fuzzing because of the twisting.
  • the linear grinding member 11 C in this example has an elliptical cross-sectional shape in a direction perpendicular to the axis line thereof.
  • the linear grinding member 11 C in this example has a dimension in the thickness direction T (a direction along the minor axis) smaller than a dimension in the width direction W (a direction along the major axis). Hence, the linear grinding member 11 C easily bends in the thickness direction T, and is hard to break off. Thus, the linear grinding member 11 C is suitable for deburring, for example, a surface having a lot of irregularities on a surface to be processed. Additionally, the linear grinding member 11 C has a cross section thinner in the thickness direction than in the width direction. Therefore, the tip thereof easily breaks, and the self-sharpening action for generating a new cutting edge is active. Furthermore, clogging is unlikely to occur because the linear grinding member 11 C is thin.
  • the linear grinding member 11 C has an edge effect because it is hard to bend in a direction along the major axis of the cross-section. Furthermore, the linear grinding member 11 C has different degrees of easiness to bend in the thickness direction and width direction of the cross section, and consequently makes irregular motions during processing. Thus, the linear grinding member 11 C provides increased grinding performance because it makes irregular motions and has an edge effect at the same time. Therefore, the linear grinding member 11 C easily adapts to irregularities on a workpiece, thus being suitable for deburring and surface polishing where excellent grindability is desired.
  • An aspect ratio (a value obtained by dividing a dimension in the width direction W by a dimension in the thickness direction T) of the linear grinding member 11 C is in the range of 1.1 to 5.0. More specifically, it has been found that, with the aspect ratio in the range of 1.1 to 5.0, the linear grinding member 11 C is harder to bend in a direction along the major axis of the cross section and exerts an edge effect.
  • the aspect ratio set in the range of 2.0 to 5.0 is highly effective for the activeness of the self-sharpening action, the degree of clogging prevention, the irregularity of motions during processing, and the edge effect.
  • the linear grinding member 11 C having an elliptical shape does not leaving damages such as scratches in processing of a workpiece because of having no corners in the cross section, and is therefore usable for, for example, surface polishing where fine surface roughness is desired.
  • the surface roughness of a workpiece after processing tends to be rougher when processing efficiency is increased with the aspect ratio increased, and tends to be finer when processing efficiency is decreased with the aspect ratio decreased.
  • the composite yarn 15 moves on while being guided by a guide member 54 such as a roller placed inside a resin binder container 53 , and guide members 55 and 56 such as rollers placed outside the resin binder container 53 .
  • the composite yarn 15 is immersed with the resin binder 16 reserved in the resin binder container 53 , thus being impregnated with the resin binder 16 , before it is wound up around the bobbin 52 .
  • the composite yarn 15 impregnated with the resin binder 16 is wound around the bobbin 52 without overlapping itself.
  • the linear grinding member 11 (linear grinding member 11 A) having a square cross-sectional shape is obtained as illustrated in FIG. 4 .
  • the linear grinding member 11 (linear grinding member 11 B) having a rectangular cross-sectional shape is obtained as illustrated in FIG. 6 .
  • the linear grinding member 11 (linear grinding member 11 C) having an elliptical cross-sectional shape is obtained as illustrated in FIG. 7 .
  • the passage may be formed as any one of a through-hole and a groove that opens on a side surface of the die 61 .
  • FIG. 9 is an illustration depicting a second example of a method for manufacturing a linear grinding member, where (a) and (b) of FIG. 9 illustrate an impregnation step and steps following the impregnation step. Note that the basic configuration of the mode illustrated in FIG. 9 is the same as in the mode described with reference to FIG. 8 . Hence, common reference signs are given to common components and descriptions thereof are omitted.
  • the composite yarn 15 of inorganic filaments is impregnated with the uncured resin binder 16 in the impregnation step illustrated in (a) of FIG. 9 as in the case of the impregnation step described with reference to (a) of FIG. 8 .
  • the composite yarn 15 is supplied in a state wound around the cylindrical or columnar bobbin 51 .
  • the composite yarn 15 is immersed with the resin binder 16 reserved in the resin binder container 53 to be impregnated with the resin binder 16 .
  • the bobbin 51 is provided with a drive unit 59 that rotates the bobbin 51 about an axis line P extending in a direction in which the composite yarn 15 is fed.
  • the drive unit 59 rotates the bobbin 51 about the axis line P synchronously with feeding of the composite yarn 15 . Consequently, the composite yarn 15 is twisted as schematically illustrated in FIG. 5 .
  • the twisting is such that, when the linear grinding member 11 having a square cross-sectional shape as illustrated in FIG. 5 is manufactured, a length dimension S of the linear grinding member corresponding to one turn of twisting is set in the range of 1 cm to 4 cm.
  • the impregnated composite yarn 15 wound around the bobbin 52 is then subjected to a shaping step where the cross-sectional shape thereof is shaped when passing through a die 61 , and then subjected to a resin-curing step where the impregnated composite yarn 15 is put in a heating furnace 62 where the resin binder 16 is cured.
  • the linear grinding member 11 having the composite yarn 15 of a plurality of inorganic filaments stiffened with the resin binder 16 is obtained.
  • This linear grinding member 11 is cut into pieces of a predetermined dimension after the resin-curing step.
  • the linear grinding member 11 may be cut into pieces of a predetermined dimension after being wound around another bobbin (not illustrated).
  • the die 61 has an opening section 610 through which the already impregnated composite yarn 15 passes, whereby, when passing through the die 61 , the composite yarn 15 is shaped to have a cross-sectional shape corresponding to the shape of the opening section 610 .
  • the linear grinding member 11 having a square, rectangular or elliptical cross-sectional shape is obtained.
  • the cross-sectional shape of the composite yarn 15 is shaped in such a manner that: the composite yarn 15 is impregnated with the uncured resin binder 16 in the impregnation step; and thereafter the composite yarn 15 impregnated with the resin binder 16 is passed through the die 61 in the shaping step before the resin binder 16 is cured in the resin-curing step.
  • the cross-sectional shape of the linear grinding member 11 can be easily controlled.
  • the brush-like grinding stone 1 including linear grinding members each having a cross-sectional shape suitable for a purpose such as surface polishing or deburring of a cross-hole can be obtained.
  • a twisting step of twisting the composite yarn 15 is performed before the impregnation step, and inorganic filaments become tangled in the composite yarn 15 as a result of the twisting of the composite yarn 15 .
  • it is easier to control the cross-sectional shape of the linear grinding member 11 than in a case where another composite yarn 15 in which the inorganic filaments extend parallel to one another is used.
  • a length dimension of the linear grinding member 11 corresponding to one turn of twisting is set in the range of 10 cm to 20 cm if the aspect ratio thereof is in the range of 2.0 to 5.0. More specifically, for the linear grinding member 11 that has an aspect ratio of 2.0 or higher, a length dimension of the linear grinding member 11 corresponding to one turn of twisting is set larger than for the linear grinding member 11 that has a square cross-sectional shape. Hence, the inorganic filaments in the composite yarn 15 become tangled both in the thickness direction and in the width direction even when the aspect ratio is so large as 2.0 or higher.
  • the linear grinding member 11 having a rectangular or elliptical cross-sectional shape the aspect ratio of which is 2.0 or higher is twisted, the inorganic filaments tend to fuzz in the thickness direction.
  • a length dimension of the linear grinding member 11 corresponding to one turn of twisting is set larger than that of another linear grinding member 11 having a square cross-sectional shape, which can prevent the inorganic filaments from fuzzing.
  • the length dimension of the linear grinding member 11 corresponding to one turn of twisting is not more than 20 cm, whereby effects of the twisting can be exerted.
  • the length dimension of the linear grinding member 11 corresponding to one turn of twisting is 10 cm or more, whereby the inorganic filaments can be prevented from fuzzing because of the twisting.
  • the resin-curing step follows the shaping step in the first example and the second example, the shaping step and the resin-curing step may be concurrently performed with a heating unit provided to the die 61 .
  • each of the first example and the second example may further include, after the shaping step of shaping the cross-sectional shape of the composite yarn 15 by passing the composite yarn 15 through the die 61 , a size adjustment step of cutting out the shaped linear grinding member into pieces having a cross-sectional shape of a predetermined size.
  • each of these examples may exclude the shaping step of passing the composite yarn 15 through the die 61 to shape the cross-sectional shape thereof, and include, after the impregnation step and the resin-curing step are continuously performed, a polishing shaping step of polishing an outer circumferential surface of the composite yarn 15 to shape the cross-sectional shape thereof into a square, rectangle, or ellipse.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Brushes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US14/773,307 2013-03-08 2014-03-07 Linear grinding member, brush-like grinding stone, and method for manufacturing linear grinding member Abandoned US20160016293A1 (en)

Applications Claiming Priority (3)

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JP2013-046982 2013-03-08
JP2013046982A JP6325195B2 (ja) 2013-03-08 2013-03-08 ブラシ状砥石の製造方法、線状砥材およびブラシ状砥石
PCT/JP2014/056028 WO2014136954A1 (ja) 2013-03-08 2014-03-07 線状砥材、ブラシ状砥石および線状砥材の製造方法

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EP (1) EP2965866B1 (es)
JP (1) JP6325195B2 (es)
KR (1) KR20150126668A (es)
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US20170036323A1 (en) * 2014-05-22 2017-02-09 Xebec Technology Co., Ltd. Tool holder, polishing tool, polishing tool unit, and method of adjusting protruding amount of grinding member
US20170304997A1 (en) * 2014-10-27 2017-10-26 Taimei Chemicals Co., Ltd. Polishing brush
USD810446S1 (en) * 2016-07-15 2018-02-20 Taimei Chemicals Co., Ltd. Wheel brush
USD811092S1 (en) * 2016-07-15 2018-02-27 Taimei Chemicals Co., Ltd. Wheel brush
USD841334S1 (en) * 2016-07-15 2019-02-26 Taimei Chemicals Co., Ltd. Wheel brush
US10322488B2 (en) * 2014-05-01 2019-06-18 Taimei Chemicals Co., Ltd. Rotating tool, and polishing tool
US10675728B2 (en) * 2018-10-29 2020-06-09 Shin-Yain Industrial Co., Ltd. Cutter holder capable of polishing

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DE112016007066T5 (de) 2016-07-15 2019-03-28 Taimei Chemicals Co., Ltd Radbürste und schleifelementbündelhalter
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US10322488B2 (en) * 2014-05-01 2019-06-18 Taimei Chemicals Co., Ltd. Rotating tool, and polishing tool
US20170036323A1 (en) * 2014-05-22 2017-02-09 Xebec Technology Co., Ltd. Tool holder, polishing tool, polishing tool unit, and method of adjusting protruding amount of grinding member
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US20170304997A1 (en) * 2014-10-27 2017-10-26 Taimei Chemicals Co., Ltd. Polishing brush
US10399207B2 (en) * 2014-10-27 2019-09-03 Taimei Chemicals Co., Ltd. Polishing brush
USD810446S1 (en) * 2016-07-15 2018-02-20 Taimei Chemicals Co., Ltd. Wheel brush
USD811092S1 (en) * 2016-07-15 2018-02-27 Taimei Chemicals Co., Ltd. Wheel brush
USD841334S1 (en) * 2016-07-15 2019-02-26 Taimei Chemicals Co., Ltd. Wheel brush
US10675728B2 (en) * 2018-10-29 2020-06-09 Shin-Yain Industrial Co., Ltd. Cutter holder capable of polishing

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EP2965866B1 (en) 2020-04-22
MX2015011248A (es) 2016-03-04
CN105026108A (zh) 2015-11-04
EP2965866A4 (en) 2016-11-02
EP2965866A1 (en) 2016-01-13
JP6325195B2 (ja) 2018-05-16
WO2014136954A1 (ja) 2014-09-12
KR20150126668A (ko) 2015-11-12
BR112015021636B1 (pt) 2021-11-23
BR112015021636A2 (pt) 2020-01-28
JP2014172126A (ja) 2014-09-22

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