EP2570238B1 - Eco-friendly abrasion product for grinder and method of manufacturing the same - Google Patents

Eco-friendly abrasion product for grinder and method of manufacturing the same Download PDF

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Publication number
EP2570238B1
EP2570238B1 EP11009399.4A EP11009399A EP2570238B1 EP 2570238 B1 EP2570238 B1 EP 2570238B1 EP 11009399 A EP11009399 A EP 11009399A EP 2570238 B1 EP2570238 B1 EP 2570238B1
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EP
European Patent Office
Prior art keywords
fabric material
fiber
layer
abrasion
eco
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11009399.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2570238A3 (en
EP2570238A2 (en
Inventor
Hyuk-Bae Kim
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.)
Deerfos Co Ltd
Original Assignee
Deerfos Co Ltd
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Filing date
Publication date
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Publication of EP2570238A2 publication Critical patent/EP2570238A2/en
Publication of EP2570238A3 publication Critical patent/EP2570238A3/en
Application granted granted Critical
Publication of EP2570238B1 publication Critical patent/EP2570238B1/en
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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
    • B24D13/14—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by the front face
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/02—Backings, e.g. foils, webs, mesh fabrics
    • 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
    • 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
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • 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
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means

Definitions

  • the present invention relates to an eco-friendly abrasion product for a grinder and a method of manufacturing the same and, more particularly, to an eco-friendly abrasion product for a grinder which is no need for an additional back and is eco-friendly and which has less shaking, and a method of manufacturing the same.
  • Such an abrasive product is e.g. known from document KR 2010 0111114 A .
  • a grinder assembly 10 is used to make smooth the surface of a metal processed product or a structure.
  • the grinder assembly 10, as shown in FIG. 1 includes driving means 2, a grinder 1 equipped with a shaft 3 coupled to the driving means 2, and a soft abrasion disk 5 detachably coupled to the shaft 3 of the grinder 1 by means of fixing means 6 and 7 with a support plate 4 interposed between the soft abrasion disk 5 and the shaft 3.
  • the reason why the abrasion disk 5 is formed separately from the support plate 4 is that the abrasion disk 5 needs to be rapidly replaced because the service life span of the abrasion disk 5 is at most only 1 minute as compared with working hours for grinding a working subject.
  • abrasion disk 5 Furthermore, fiber products are chiefly used as the abrasion disk 5.
  • a pad i.e., the support plate 4 for supporting the abrasion disk 5 is required because the abrasion disk 5 is very flexible.
  • the soft abrasion disk 5 and the support plate 4 are separately formed as described above, however, there are problems in that the abrasion disk 5 and the support plate 4 are not easily combined because the abrasion disk 5 is commonly molded in a flat form and the support plate 4 is commonly molded in a predetermined form and shaking may occur at the time of rotation because the support plate 4 does not uniformly pressurize the rear of the abrasion disk 5.
  • the abrasion disk 5 is broken by force because the abrasion disk 5 has weak tensile strength and small elongation.
  • the abrasion disk 5 is made of fiber material, the shape of the abrasion disk 5 is curled because the abrasion disk 5 is sensitive to temperature or humidity.
  • the abrasion performance and abrasion durability of the abrasion disk 5 are deteriorated because the rotation stability and durability of the abrasion disk 5 are deteriorated under high load and high RPM working conditions.
  • the support plate 4 In order to improve the grinding ability of the abrasion disk 5 in a high load and a high RPM, the support plate 4 needs to be made of hard material. If the support plate 4 is made of metal, etc., a worker's wrist is overstrained because weight is increased. If the support plate 4 is made of light metallic material, such as aluminum, there are problems in that a cost rises and static electricity or heat is generated when the support plate 4 is rotated. The static electricity or heat makes poor a worker's working environment.
  • a back pad including glass fiber is used instead of the support plate 4 in order to increase durability.
  • glass fiber burrs, generated by friction when the abrasion disk 5 is rotated, are harmful to the human body of a worker.
  • the present invention has been made in an effort to provide an eco-friendly abrasion product for a grinder having advantages of not requiring an additional support plate, improving grinding performance and abrasion durability because sufficiently durable material rarely deteriorated by rupture or breakage even in a high RPM and a high load is used, enabling economic and simple fabrication, being eco-friendly without the use of glass fiber, etc., and not requiring additional cooling means, and a method of manufacturing the same.
  • An exemplary embodiment of the present invention provides an eco-friendly abrasion product for a grinder, according to claim 1.
  • Another exemplary embodiment of the present invention provides a method of manufacturing an eco-friendly abrasion product, according to claim 4.
  • a support plate and several abrasion disks need not to be additionally used for a grinding task for the subject of grinding because the subject of grinding has only to be directly coupled to a grinder by means of one eco-friendly abrasion product for a grinder.
  • the eco-friendly abrasion product for a grinder is molded in a predetermined form so that the eco-friendly abrasion product efficiently faces the subject of grinding when a grinder is rotated and thus grinding efficiency is increased. Accordingly, the eco-friendly abrasion product for a grinder is rarely deteriorated by rupture or breakage even in a high RPM and a high load and abrasion performance and abrasion durability can be improved because the reinforcement layer is made of durable material.
  • the eco-friendly abrasion product for a grinder is economic because cheap hemp can be used and can be simply fabricated because the base layer and the molding layer can be combined by thermosetting resin coated on natural fiber forming the reinforcement layer.
  • the eco-friendly abrasion product for a grinder is eco-friendly because glass fiber, etc. is not used, and it may not take additional cooling means into consideration because the reinforcement layer basically has a netting thread structure.
  • FIG. 2 is an exploded perspective view of a grinder assembly using an eco-friendly abrasion product for a grinder according to an exemplary embodiment of the present invention
  • FIG. 3 is a lateral view of the eco-friendly abrasion product for a grinder according to the exemplary embodiment of the present invention.
  • the eco-friendly abrasion product 100 for a grinder includes a base layer 110 formed by processing at least one face of paper in order to increase abrasion and chemical resistance, a reinforcement layer 120 of at least one layer formed on the base layer 110 and weaved using natural fiber in a netting thread tissue form, a molding layer 130 disposed on the at least one reinforcement layer 120, thermally compressed and fixed, and configured to include a central depression flat unit 100b having the fixing hole 100a formed therein, an extension unit 100d protruded forwardly from a central flat unit 100c, and an external circumferential unit 100e inclined from the front to the rear of the extension unit 100d, and an abrasive layer 140 formed on the molding layer.
  • the base layer 110, the reinforcement layer 120, the molding layer 130, and the abrasive layer 140 are sequentially laminated from the front (i.e., a part close to a grinder) to the front (i.e., a part close to a grinding face).
  • the base layer 110 be made of paper, including latex of about 25 to 30% and having basis weight of 80-100g/m2 and a thickness of about 0.1-0.2 mm, in order to provide some degree of elasticity and abrasion resistance to the eco-friendly abrasion product 100 and to prevent the infiltration of chemicals.
  • the reinforcement layer 130 has strength (g/den) of 5.5-6.5, and recovery of 65% of a shear upon extension of 2.7-3.7% and of elongation of 2% because it includes natural fiber, preferably, include a cellulose molecular structure, has good abrasion resistance, good dimension stability, and a low absorption ration, and it is thus stable against an organic solvent. It is preferred that the reinforcement layer 130 be fabricated by impregnating jute into adhesives including an organic solvent, such as phenol resin, and then weaving the jute after dry in order to improve durability.
  • an organic solvent such as phenol resin
  • the jute may be weaved in a plain weave form in order to form a netting thread tissue and may be weaved in a dual weaving so that warp and weft overlap with each other in a 3x3 form. If the jute including at least two single layer structures is impregnated into phenol resin, etc. and then heated and compressed, abrasion performance and long grinding durability can be provided to the abrasive layer 140 because the abrasive layer 40 can be sufficiently supported.
  • a type of fiber, the thickness of fiber, a weaving density, the number of weaving, etc. may be selected in various ways according to the use of an abrasion product, the grain size of abrasives, a type of the subject of grinding, and an abrasion working environment. If the dimension of the eco-friendly abrasion product according to an exemplary embodiment of the present invention is 127 mm (5 inches), the thickness of the eco-friendly abrasion product may be 0.3 cm to 0.5 cm in order to provide shape stability.
  • the abrasive layer 140 may be made of aluminum oxide, silicon carbide, zirconia alumina oxide, ceramic, garnet, artificial diamond, flint, emery, crocus (iron oxide powder), granuals solely or may be made of a mixture of abrasives of them.
  • the abrasives have different performance according to a type of the subject of grinding, the degree of abrasion of the subject of grinding, and luminance.
  • thermosetting adhesives coated on the natural textile yarn circumference of the reinforcement layer 120 and thermosetting adhesives included in the molding layer may be used as adhesive.
  • the molding layer 130 is fabricated by impregnating one or more of polyester, cotton, and textile yarn of polyester + cotton into a mixed solution of the thermosetting adhesives and latex and then performing a heat setting process. Accordingly, the molding layer 130 has increased tensile strength of about 58%, a maximum displacement of about 46%, and improved dimension stability, as compared with commonly weaved fiber.
  • the molding layer 130 can be easily molded in a predetermined form by applying heat and pressure thereto because it includes the mixed solution of the thermosetting adhesives and the latex.
  • the molding layer 130 preferably may maintain the predetermined shape after heat setting.
  • the abrasive layer 140 is formed by adhering abrasives 141 to the molding layer 130 with production adhesives 142 interposed therebetween and coating coating adhesives 143 on the outer side of the abrasives 141.
  • each of the production adhesives 142 and the coating adhesives 143 is too much, a crack phenomenon may occur. If the amount of the production adhesives 142 is smaller than a standard, problems such as shattering or napping occur in the abrasives 141. If the amount of the coating adhesives 143 is smaller than a standard, grinding durability is deteriorated.
  • the thickness of the base layer 110 be about 0.1-0.014 mm
  • the thickness of the reinforcement layer 120 be 1.8 to 2 mm by folding two sheets of flax fabric materials
  • the thickness of the molding layer 130 be 0.7 to 0.8 mm
  • the thickness of the production adhesives layer 142 be 0.2 to 0.25 mm
  • the thickness of the abrasives layer 141 be 0.5 to 0.63 mm
  • the thickness of the coating adhesives layer 143 be 0.35 to 0.40 mm.
  • the thermosetting resin may include one or more, selected from the group consisting of polyurethane, acryl, and epoxy resin, and a durability reinforcement combiner composed of 2 liquid type synthetic resin, including a mixture of a hardening accelerant and a solvent.
  • the eco-friendly abrasion product 100 for a grinder includes the central depression flat unit 100b configured to have the fixing hole 100a formed therein, the extension unit 100d protruded forwardly from the central flat unit 100c, and the external circumferential unit 100e backwardly inclined from the front end of the extension unit 100d.
  • the external circumferential unit 100d inclined from the front end of the extension unit 100d is backwardly inclined at an angle of 6 to 8°.
  • the external circumferential unit 100d inclined from the front end of the extension unit 100d is backwardly inclined at an angle of 6 to 8 ° as described above, grinding performance and a life span can be improved because the external circumferential unit 100d rotates and pressurizes an inclined grinding surface and thus increases a contact area.
  • the fixing means 6 and 7 did not hinder grinding if the eco-friendly abrasion product 100 for a grinder of about 127 mm (5 inches) was fixed to the shaft 3.
  • the illustrated numeral values are preferred examples when a specific grinder was used. If another type of a grinder is used or the dimension of the fixing means 6 and 7 is changed, proper numerical values of the abrasion product 100 may be changed.
  • FIG. 4 is a graph for illustrating the grinding performance and grinding durability of the eco-friendly abrasion product for a grinder according to an exemplary embodiment of the present invention.
  • FIG. 5 is a flowchart for illustrating a method of manufacturing the eco-friendly abrasion product for a grinder according to an exemplary embodiment of the present invention
  • FIG. 6 is a schematic diagram for illustrating an apparatus for manufacturing the eco-friendly abrasion product for a grinder according to an exemplary embodiment of the present invention.
  • the method of manufacturing the eco-friendly abrasion product for a grinder includes supplying a base fabric material 11 formed by performing chemical-resistant processing on at least one face of paper through a first supply roll 101, a reinforcement layer fabric material 12 weaved using natural textile yarn coated with thermosetting resin through a second supply roll 102, and a molding layer fabric material 13 weaved using thermal compression fixing fiber through a third supply roll 103 at steps S10, S20, and S30, and forming a laminated fabric material 14 through the medium of thermosetting resin included in the reinforcement layer fabric material 12 and the molding layer fabric material 13 by passing the base fabric material 11, the reinforcement layer fabric material 12, and the molding layer fabric material 13 between a pair of contact rollers 104 and 104' at the same time and then applying heat and pressure at step S40.
  • a flat and flexible disk-shaped pattern 14a partially cut by iron impressions 105 and 105' is formed in the laminated fabric material 14 passing through the pair of contact rollers 104 and 104' at step S50.
  • the iron impressions 105 and 105' include knifes for cutting and forming a predetermined shape at the time of pressurization. Automation is possible and a work can be performed more efficiently because the knife 105a is partially formed and the disk-shaped pattern 14a can be moved with it maintained in the laminated fabric material 14.
  • the pair of molds 106 and 106' may have a predetermined shape, including a central depression flat unit configured to have a fixing hole formed therein, an extension unit forwardly protruded from the central flat unit, and an external circumferential unit inclined from the front end to the rear of the extension unit at an angle of 6 to 8° .
  • the pair of molds 106 and 106' have relevant shapes, and the lower mold 106' from among the pair of molds 106 and 106' is replaced a buffer mold 107.
  • the lower mold 106' is cooled and hardened to form a green abrasion product 100' at step S70.
  • the lower mold 106' may further include cooling means, and the green abrasion product 100' may be removed from the lower mold 106' and used as the buffer mold 107.
  • the recovery speed of the recovery roller 109' can be controlled according to the supply speeds of the first, second, and third supply rollers 101, 102, and 103 and the speeds of the iron impression 105 and the upper mold 106 in order to adjust the working speed.
  • the abrasives are combined with the production adhesives on the green abrasion product 100', and the outer side of green abrasion product 100' is coated with coating adhesives at step S80.
  • the molding layer fabric material 13 may be impregnated into a mixed solution of thermosetting adhesives, including denatured phenol and polysiloxane (5-50% contents), and latex in textiles weaved using one or more of polyester, cotton, and polyester + cotton.
  • the impregnated weaved fiber be pulled 3-10% in an inclination direction and then thermally fixed for 30 to 180 seconds through a heat setting apparatus at a temperature of 150-230 °C in order to increase tensile strength of about 50% or higher.
  • thermosetting resin be coated in thickness of 500-1,500 ⁇ m using a wet film thickness gauge.
  • the thermosetting resin includes one or more selected from the group consisting of polyurethane, acryl, and epoxy resin and 2 liquid type synthetic resin formed of a mixture of a hardening accelerant and a solvent.
  • the thermosetting resin may have improved durability by passing it through a dry furnace of 100-110°C for 1 - 2 minutes in order to volatize the solvent.
  • the natural textile yarn of the reinforcement layer includes one or more of bast fiber, including linen, ramie, hemp, and jute; leaf fiber, including Manila hemp, Saisal hemp, New Zealand Hemp, and aloe fiber; and fruit fiber, including coir (coconut fiber).
  • bast fiber including linen, ramie, hemp, and jute
  • leaf fiber including Manila hemp, Saisal hemp, New Zealand Hemp, and aloe fiber
  • fruit fiber including coir (coconut fiber).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Laminated Bodies (AREA)
EP11009399.4A 2011-09-19 2011-11-28 Eco-friendly abrasion product for grinder and method of manufacturing the same Active EP2570238B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110094058A KR101862371B1 (ko) 2011-09-19 2011-09-19 그라인더용 친환경 연마제품 및 그 제조방법

Publications (3)

Publication Number Publication Date
EP2570238A2 EP2570238A2 (en) 2013-03-20
EP2570238A3 EP2570238A3 (en) 2017-09-27
EP2570238B1 true EP2570238B1 (en) 2019-05-15

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EP11009399.4A Active EP2570238B1 (en) 2011-09-19 2011-11-28 Eco-friendly abrasion product for grinder and method of manufacturing the same

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EP (1) EP2570238B1 (ko)
KR (1) KR101862371B1 (ko)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015009977U1 (de) 2015-07-22 2022-02-18 Lukas-Erzett Gmbh & Co. Kg Schleifscheibe mit einem Vlies-Stützteller
DE102015111899A1 (de) 2015-07-22 2016-01-28 Lukas-Erzett Vereinigte Schleif- Und Fräswerkzeugfabriken Gmbh & Co. Kg Schleifscheibe mit einem Vlies-Stützteller
CN108214336A (zh) * 2018-03-29 2018-06-29 青岛元汇丰企业管理咨询服务有限公司 一种耐磨抗拉砂带生产工艺
CN111002236A (zh) * 2019-12-27 2020-04-14 郑州安信研磨科技有限公司 一种双层砂盘及其制备工艺
KR102233399B1 (ko) * 2020-07-23 2021-03-26 주식회사 티유글로벌 작업 효율이 향상된 연마 디스크 및 이의 제조방법

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101088494B1 (ko) * 2009-04-06 2011-11-30 주식회사 디어포스 그라인더형 친환경연마제품 및 그 제조방법
EP2286959B1 (de) * 2009-08-22 2014-05-07 August Rüggeberg GmbH & Co. KG Schrupp-Schleif-Werkzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
EP2570238A3 (en) 2017-09-27
EP2570238A2 (en) 2013-03-20
KR20130030531A (ko) 2013-03-27
KR101862371B1 (ko) 2018-05-29

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