EP2470330B1 - Method of obtaining a tool for working stone materials - Google Patents

Method of obtaining a tool for working stone materials Download PDF

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Publication number
EP2470330B1
EP2470330B1 EP10740384.2A EP10740384A EP2470330B1 EP 2470330 B1 EP2470330 B1 EP 2470330B1 EP 10740384 A EP10740384 A EP 10740384A EP 2470330 B1 EP2470330 B1 EP 2470330B1
Authority
EP
European Patent Office
Prior art keywords
mold member
barrier member
salt
fluid compound
compound
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
EP10740384.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2470330A1 (en
Inventor
Stefano Fioratti
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.)
Aros SRL
Original Assignee
Aros SRL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aros SRL filed Critical Aros SRL
Priority to PL10740384T priority Critical patent/PL2470330T3/pl
Publication of EP2470330A1 publication Critical patent/EP2470330A1/en
Application granted granted Critical
Publication of EP2470330B1 publication Critical patent/EP2470330B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B24D3/34—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
    • B24D3/346—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 utilised during polishing, or grinding operation
    • 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
    • B24D7/14—Zonally-graded wheels; Composite wheels comprising different abrasives

Definitions

  • the present invention regards a method of obtaining a tool, and in particular an abrasive block, particularly for working both natural and artificial stone materials (see for example JP-A-58155176 ).
  • polishing tools e. g. calcareous or marble stones
  • polishing tools termed blocks in jargon.
  • Such tools usually have a working portion, i.e. that intended to come into direct contact with the material to be worked, which includes a salt, normally a potassium acid oxalate derived from oxalic acid, from which potassium bioxalates or tetraoxalates can be obtained.
  • a salt normally a potassium acid oxalate derived from oxalic acid, from which potassium bioxalates or tetraoxalates can be obtained.
  • Such salt is suitable for binding with calcium carbonate, thus forming an insoluble salt, calcium oxalate, which has a very brilliant appearance.
  • the starting salt is mixed with natural resins, such as lac, or synthetic resins, such as phenol or polyester resins, so as to obtain blocks that are removably anchorable to a rotating polishing head of a polishing machine.
  • natural resins such as lac
  • synthetic resins such as phenol or polyester resins
  • Potassium acid oxalate known to be a harmful substance, constitutes a polluting agent for the environment. Considering that at least the part of the block-tool directly anchored on the polishing head or close to the same cannot be fully used for working a stone surface to be polished, at the end of the useful lifetime of the tool it must be removed from the polishing head and disposed of respecting severe safety laws and criteria in handling and destroying the polluting materials.
  • the main object of the present invention is to provide a method for making a new abrasive block tool structure.
  • Another object of the present invention is to provide an abrasive block tool structure that, once used up to the end of its useful lifetime, does not require being treated as a polluting waste material, which is entirely advantageous with regard to working costs and environmental protection costs.
  • Another object of the present invention is to provide a new abrasive block structure that can be obtained with competitive costs with respect to the conventional abrasive blocks.
  • a method is provided of obtaining a block tool, particularly for working stone materials, comprising the following steps:
  • a block tool support or base comprising a substantially tubular body delimiting an axial light therein, and at least one barrier member having pores of size ranging from 0.1 mm to 15 mm, the at least one barrier member being anchored to the substantially tubular body thereby intercepting the axial light thereof.
  • a tool comprising a connecting portion including at least one foamed compound selected from the group comprising epoxy, polyurethane, silicon, polyester and acrylic resins, and a working portion including granular material comprising at least one salt of a component selected form the group including oxalic acid and its derivatives in mixture with a foamed compound selected from the group comprising epoxy, polyurethane, silicon, polyester and acrylic resins, the working portion and the connecting portion being separated by at least one barrier member permeable to the at least one foamed fluid compound before and/or while being foamed, and impermeable to the at least one salt, the at least one salt being located only in the working portion.
  • the present invention regards a method of obtaining a tool for working stone materials, according to which the following are arranged:
  • the foamable fluid compound and the granular material are supplied into the mold member(s), and the barrier member is engaged with the mold element 1 before or after such supply so as to delimit a receiving zone ZC and a foaming zone ZE.
  • the foamable fluid compound is supplied into the receiving zone ZC, while the granular material is housed in the receiving zone ZC or in the foaming zone ZE.
  • the foamable fluid compound is allowed to expand or caused to expand from the receiving zone ZC to the foaming zone ZE, so that a portion of the foamable fluid compound passes through the barrier member, thus obtaining a tool 4 equipped with a working portion 4a including the salt granules in mixture with part of the expanded fluid compound, and a connecting portion 4b including the other part or portion of the fluid compound now in expanded state.
  • the supply of the foamable fluid compound is carried out before the barrier member is engaged with the mold member 1. Still more advantageously, also the supply of the granular material is carried out before the barrier member is engaged with the mold member 1.
  • the granular material and the foamable fluid compound are supplied together in mixture into the mold element(s).
  • the foamable fluid compound is supplied by casting in the mold element 1.
  • Salts that can be used for carrying out a method or a tool according to the present invention are for example the salts known as "Potassium Tetraoxalate type B", “Potassium Tetraoxalate type C”, “Potassium Tetraoxalate type U1", all produced and sold by Connects Chemicals Italia s.r.l. of Vimercate (Milan).
  • the granular material includes, in addition to the above-indicated salt granules, also one or more mineral or metal compounds selected from the group including talc, calcium silicate, calcium carbonate, magnesium carbonate, magnesium oxide, aluminum oxide, tin oxide, cerium oxide, zirconium oxide, and metal materials such as bronze, copper, tin, silver and lead.
  • mineral or metal compounds selected from the group including talc, calcium silicate, calcium carbonate, magnesium carbonate, magnesium oxide, aluminum oxide, tin oxide, cerium oxide, zirconium oxide, and metal materials such as bronze, copper, tin, silver and lead.
  • a method in accordance with the present invention according to which, after having arranged a mold member 1, a mixture of granular material is supplied therein, including a salt as indicated above and a foamable fluid compound. Then, (possibly after a step of leveling the mixture supplied in the mold member) a barrier member, such as a grid or web 2a, is engaged with the mold member 1, thereby delimiting a receiving zone ZC.
  • a barrier member such as a grid or web 2a
  • the mold member 1 can for example include a bottom wall 1 a and a side wall 1 b rising from the bottom wall 1 a, thereby delimiting a receiving cavity.
  • the side wall 1b has a flanged terminal outwardly projecting section 1c, e. g. substantially parallel with the bottom wall 1 a, and delimits an external abutment shoulder.
  • an external lower shoulder 1 d is preferably provided at a predetermined distance from the flanged terminal section 1c.
  • a counter-mold member 5 is also arranged.
  • the counter-mold member 5 includes, for example, a tubular body provided with a first section delimiting an axial light with constant cross section 5a and then a second section 5b delimiting an axial light with cross section that increases moving away from the first section 5a.
  • the first section 5a also has slightly lower section and greater extension than the flanged terminal section 1c of the mold member 1, so that the first section 5b of the counter-mold member 5 can be perfectly inserted in the mold member 1 and abutted against the shoulder 1d.
  • a mixture of foamable fluid compound and granular material is supplied into the mold element 1, the grid or web 2a is arranged on the external lower shoulder 1 d of the mold member 1, and then the counter-mold member 5 is abutted against the grid or web 2a, so as to removably lock the grid or web 2a in position between the mold member 1 and the counter-mold member 5.
  • the granules and the fluid compound will then be housed in the receiving zone ZC, delimited between the mold member and the grid or web.
  • the position maintenance of the counter-mold member 5 can for example be obtained by placing a thrust or pressure element thereon, on the side of the counter-mold 5 opposite the mold member 1.
  • a thrust or pressure element could be a sheet 6 or the like.
  • foaming of the foamable fluid compound is caused, e. g. via heating.
  • the fluid compound will partly pass through the grid or web 2a so as to penetrate into an foaming zone ZE, which is delimited by the grid or net 2a, counter-mold member 5 and pressure member 6.
  • the mold member 1 and the counter-mold member 5 are removed and the tool is extracted.
  • a tool 4 provided with a connecting portion 4b (e. g. to a mandrel of a machine tool), which comprises part or a portion of the foamed fluid, selected from the group comprising epoxy, polyurethane, silicon, polyester and acrylic resins, e. g. foamable by the action of foaming agents, and a working portion 4a including granular materials comprising at least one salt of a component selected form the group including oxalic acid and its derivatives, such as potassium acid oxalate, potassium acid bioxalate, potassium acid tetraoxalate, and acetosella salts, in mixture with the other part or portion of the expanded fluid compound.
  • a connecting portion 4b e. g. to a mandrel of a machine tool
  • the foamed fluid selected from the group comprising epoxy, polyurethane, silicon, polyester and acrylic resins, e. g. foamable by the action of foaming agents
  • the barrier member e. g. a grid or web 2a.
  • the salt is only in the working portion 4a.
  • the barrier member is permeable to the foam fluid compound before and/or during the foaming thereof and is impermeable to the salt.
  • the mold member and the counter-mold member are made of a material, e. g. PVC, that the fluid compound does not adhere to.
  • FIG. 4 an alternative step is illustrated with respect to that of Fig. 3 .
  • a support or base element 7 for a tool is arranged, such as a block tool for the polishing of stone materials.
  • the support element includes a tubular side wall, which comprises a first section 7a delimiting an axial light with substantially constant cross-section and then a second section 7b that is flared or delimiting an axial light with cross-section that increases moving away from the first section 7a.
  • the support or base will preferably be made of a material on which the fluid compound adheres, e. g. polystyrene for molding (PST) or polyurethane for molding (PU).
  • PST polystyrene for molding
  • PU polyurethane for molding
  • FIG. 3 an alternative step is illustrated with respect to Fig. 3 , which is achieved by means of a support 70 (see Figs. 8 - 10 ).
  • the support or base 70 comprises a substantially tubular body delimiting an axial tunnel, and at least one barrier member intended to intercept the axial light.
  • the barrier member is anchored, e. g. glued to the support or base, or preferably the barrier member includes a porous wall made integrally with the base.
  • the support 70 can comprise a porous base wall 70c from which one or more side walls rise, which comprise a first section 70a delimiting an axial light with substantially constant cross-section and then a second section 70b that is flared or delimiting an axial light with cross-section that increases moving away from the first section 70a.
  • a mixture of foamable fluid compound and granular material is supplied into the mold member 1, then the support or base 70 is abutted against the mold member, in particular with the porous wall 70c close to and partly in abutment against the shoulder 1d.
  • the position maintenance of the support 70 in abutment against the mold member 1 can be ensured as described above with reference to the counter-mold member 5, hence with a sheet 6 or the like means.
  • a mold is illustrated intended to make six tools simultaneously, which includes six mold elements 1 anchored together, e.g. made of a single piece.
  • a counter-mold is illustrated that can be used with the mold member of Figs. 16-18 , and includes six counter-mold members 5 that are anchored together, e.g. made of a single piece.
  • a plant 10 for carrying out a method according to the present invention.
  • Such plant includes:
  • the plant also preferably includes a conveyor belt 11 for conveying the mold members along the various stations of the plant.
  • a station 17 can be provided for applying a counter-mold member or members 5 or a support or base 7 atop and in abutment against respective mold member(s) 1.
  • the plant also comprises a station 18 for leveling the mixture in the mold member(s), and a heating station 19 in which foaming of the foamable fluid compound is caused.
  • a tool is obtained having a connecting portion that only includes the non-polluting compound, the salt granules only being provided for in the working portion. After such tool has been used, and its working portion is fully worn, the tool can be disposed of without high costs, since the part of the tool to be disposed only comprises non-polluting compounds.
  • the salt granules and foamable fluid compound are separately supplied.
  • the foamable fluid compound is applied in the receiving zone, and the granules in the expansion zone, and subsequently the foamable fluid compound is allowed or caused to foam from the receiving zone to the expansion zone, thus obtaining the dispersion of the granules in the foamed fluid compound portion in the foaming zone.
  • the barrier member can be obtained from a roll of porous material, which is unrolled on top of the mold member(s) and cut to the desired size, at the start or during the production cycle of the tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Toys (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Mold Materials And Core Materials (AREA)
EP10740384.2A 2009-08-25 2010-07-19 Method of obtaining a tool for working stone materials Active EP2470330B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10740384T PL2470330T3 (pl) 2009-08-25 2010-07-19 Sposób otrzymywania narzędzia do obrabiania materiałów kamiennych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR2009A000127A IT1395690B1 (it) 2009-08-25 2009-08-25 Procedimento per la realizzazione di un utensile per la lavorazione di materiali lapidei.
PCT/IB2010/053281 WO2011024086A1 (en) 2009-08-25 2010-07-19 Method of obtaining a tool for working stone materials

Publications (2)

Publication Number Publication Date
EP2470330A1 EP2470330A1 (en) 2012-07-04
EP2470330B1 true EP2470330B1 (en) 2015-03-04

Family

ID=42028242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10740384.2A Active EP2470330B1 (en) 2009-08-25 2010-07-19 Method of obtaining a tool for working stone materials

Country Status (8)

Country Link
EP (1) EP2470330B1 (zh)
CN (1) CN102625742B (zh)
ES (1) ES2535465T3 (zh)
IT (1) IT1395690B1 (zh)
MX (1) MX2012002305A (zh)
PL (1) PL2470330T3 (zh)
PT (1) PT2470330E (zh)
WO (1) WO2011024086A1 (zh)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2306175A (en) * 1940-11-12 1942-12-22 Ernest P Mars Finish-grinding and polishing stones
ES272672A1 (es) * 1961-12-04 1962-05-01 The Osborn Manufacturing Company Mejoras en ruedas pulimentadoras
JPS58155176A (ja) * 1982-03-09 1983-09-14 Hitoshi Yamazaki 砥石車成形方法
AT379100B (de) * 1982-12-21 1985-11-11 Swarovski Tyrolit Schleif Verfahren zur herstellung einer schleifscheibe
US4907376A (en) * 1988-05-10 1990-03-13 Norton Company Plate mounted grinding wheel
CN1193067A (zh) * 1997-07-08 1998-09-16 卢兆平 柱皮
ITVR20050062A1 (it) * 2005-05-18 2006-11-19 Aros Srl Utensile a blocchetto per operazioni di finitura di superfici lavorabili e procedimento per l'ottenimento dello stesso
ITVR20060038A1 (it) * 2006-02-22 2007-08-23 Aros Srl Procedimento per l'ottenimento di un utensile diamantato particolarmente per il taglio di materiali lapidei e similari

Also Published As

Publication number Publication date
CN102625742B (zh) 2014-12-17
CN102625742A (zh) 2012-08-01
EP2470330A1 (en) 2012-07-04
WO2011024086A1 (en) 2011-03-03
ES2535465T3 (es) 2015-05-11
IT1395690B1 (it) 2012-10-16
MX2012002305A (es) 2012-03-29
PT2470330E (pt) 2015-05-20
PL2470330T3 (pl) 2015-07-31
ITVR20090127A1 (it) 2011-02-26

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