+

WO2000030812A1 - Outil abrasif pour racleuses - Google Patents

Outil abrasif pour racleuses Download PDF

Info

Publication number
WO2000030812A1
WO2000030812A1 PCT/IT1999/000381 IT9900381W WO0030812A1 WO 2000030812 A1 WO2000030812 A1 WO 2000030812A1 IT 9900381 W IT9900381 W IT 9900381W WO 0030812 A1 WO0030812 A1 WO 0030812A1
Authority
WO
WIPO (PCT)
Prior art keywords
abrasive
tool
graphite
abrasive body
modular
Prior art date
Application number
PCT/IT1999/000381
Other languages
English (en)
Inventor
Andrea Di Giuseppe
Giovanni De Gennaro
Original Assignee
Repla S.R.L.
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
Priority claimed from ITMI982560 external-priority patent/IT1303872B1/it
Priority claimed from IT1999BG000053 external-priority patent/IT1309502B1/it
Application filed by Repla S.R.L. filed Critical Repla S.R.L.
Priority to AU16792/00A priority Critical patent/AU1679200A/en
Publication of WO2000030812A1 publication Critical patent/WO2000030812A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B24D99/005—Segments of abrasive wheels
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/047—Grinding heads for working on plane surfaces
    • 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
    • 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
    • B24D7/06—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 with inserted abrasive blocks, e.g. segmental
    • B24D7/066—Grinding blocks; their mountings or supports

Definitions

  • This invention relates to a modular abrasive tool with radial swing for rotary heads of smoothing machines for granite, marble, ceramic, resin incorporating stone granules, known as resinous stone, and the like.
  • the invention also relates to a method for forming said abrasive tool.
  • the aforesaid materials are generally smoothed by machines provided with special heads 28 rotating about a vertical axis 31 with a direction of rotation 29 ( Figure 2). These machines are known as abrasive machines with Fichert swing action heads. Said smoothing heads are composed of a plurality of interchangeable or modular abrasive tools 26. These abrasive tools move with a slow swinging movement along directions 32A and 32B about their own specific radial axes 27 while they orbit about the vertical axis 31 of the rotary head.
  • These modular swing-orbiting tools consist of an abrasive body 1 generally formed from sintered bronze-based material including diamond granules.
  • the modular tools are usually in the form of "blocks” with a concave top 25 and generators parallel to said radial axis of swing 27.
  • the blocks are usually of rectangular shape with their rectangular base 30 mounted on the rotary head 28.
  • Each of these rectangular blocks is arranged radially on said machine rotary head, and hence tends to rub against the underlying machined slab 35 at a speed which is low in regions 33 close to the centre or axis of rotation 31 of the head, and high in regions 34 distant from said axis of rotation ( Figure 3).
  • peripheral parts 34 of these modular abrasive tools travel through a greater distance and undergo greater wear, however in spite of this they cannot be lowered to increase the passage depth because of the obstacle offered by the most central region 33 of the tool, which is usually less worn.
  • the wear of such modular tools 25 or blocks is irregular, preventing their abrasive surface 25 from operating under optimum conditions on the underlying slab 35 being machined.
  • the low contact force within the worn peripheral region 34 of the modular tool 26 favours undesired polishing of this region and prevents surface-emergence of the diamond granules embedded in its abrasive body 2.
  • the result is a reduction in its abrasive capacity.
  • the rotary head 28 has to be pushed against the machined slab 35 with a considerable force which in certain cases can damage the slab.
  • Such damage can consist of deep scratching due to the irregularity with which the abrasive granules are detached.
  • the damage can also consist of breakage of certain slabs.
  • This considerable force can also cause the slab 35 to bend, this being incompatible with the formation of a perfectly flat machined surface.
  • the considerable force with which such usual irregularly wearing modular tools 26 have to be thrust against the machined slab results in a short tool life.
  • Another intrinsic drawback of these usual modular abrasive tools 26 is the fact that in swinging from right to left, 32A, 32B, they offer only two "entries" or attack angles or cutting lines against the material of the slab 35 to be machined. These entries are represented by the left and right side edges of said rectangular swinging base 30.
  • the negative consequence of this characteristic of known modular abrasive tools is that the abrasive body 1 of the tool 26 is not fully utilized.
  • An object of this invention is to define a modular abrasive tool with radial swing for rotary heads of smoothing machines for granite, marble, ceramic, resinous stone and the like, having a form suitable for optimum use of its abrasive material.
  • a further object is to define a modular abrasive tool as above having a structure which gives it greater abrasive capacity independently of the grain fineness of its incorporated abrasive elements.
  • a further object is to define a method for forming such tools.
  • a modular abrasive tool with radial swing for rotary heads of smoothing machines for granite, marble, ceramic, resinous stone and the like having a shape in the form of an angular sector tapered with converging inclinations which are accentuated in those regions of lesser peripheral speed, and a structure which offers a plurality of points at which the slab being machined is abrasively attacked, said plurality of points deriving from cooperation with soft elements, preferably of graphite, which interrupt the continuity of the abrasive structure.
  • the method for forming the aforesaid modular abrasive tool is characterised by the details specified in the appropriate claim.
  • Figure 1 is a sectional perspective view of an abrasive body to be fitted to a tool 26 to be mounted radially on usual rotary smoothing heads 28 for operation by typical swing movements 32A and 32B;
  • Figure 2 is a schematic view of a usual rotary machine head 28 illustrating the special manner in which abrasive body of Figure 1 operates;
  • Figure 3 is a view from below showing the woking surface of a first embodiment of said abrasive body, associated with a usual rectangular support base;
  • Figure 4 is a view from below showing the woking surface of a second embodiment of a abrasive body, associated with a usual rectangular support base;
  • Figure 5 is a view from below showing the woking surface of a third embodiment of a abrasive body, as stated;
  • Figure 6 is a section through a sintering mould having graphite inserts in the form of substantially parallelepiped bars located in the required position by a paper reference sheet which rests on the floor of the mould and carries said bars glued on it. Best mode of carrying out the invention
  • Figure 1 shows an abrasive body 1 of a modular smoothing tool 28.
  • the abrasive body 1 incorporates graphite bars 3 of substantially parallelepiped shape. Graphite is the preferred material, but its function could be performed by other soft materials of high melting point. These bars extend along the entire extent of the abrasive working surface 2 (25 in Figure 2) to divide it into regions of abrasive material 2A, 2B, 2C, 2D alternating with graphite regions 3A, 3B, 3C.
  • Said abrasive material consists of sintered metals, preferably bronze, with included diamond particles of size inversely proportional to the degree of smoothing which they are required to achieve.
  • the inert material strips 3 are arranged parallel to each other in the direction longitudinal to the radial extension of the modular abrasive body 26. This radial direction is expressed in Figure 2 by a point 27, representing the radial axis of swing of the abrasive tool 26 to the head 28, which rotates in the direction 29.
  • Particular examples of these abrasive surface arrangements 2 or 25 are shown in Figures 3, 4, 5.
  • Figure 3 is a view from below showing the form of the abrasive tool working surface, which is contained within the rectangular perimeter of the base 30 of a steel support for the abrasive body 1 (Figure 2).
  • This working surface comprises the three strips of graphite or other inert material 3A, 3B, 3C.
  • Figure 4 is a view from below showing the form of a working surface defined by edges 43 which taper in the manner of those of Figure 3, and includes four graphite strips 3D, 3E, 3F, 3G.
  • Figure 5 is a similar view showing a surface form (of the abrasive body 1) comprising five graphite strips 3H, 3L, 3M, 3N, 3P.
  • the graphite or inert material bars or strips are arranged longitudinally and parallel to each other.
  • this longitudinal direction becomes radial along the axis 27 (perpendicular " to the drawing of Figure 2)).
  • the presence of the graphite strips 3 creates raised regions presenting a multiplicity of lines of attack 4 against the material of the slab 35 to be smoothed ( Figure 1). Cutting angles, present along these raised lines of attack 4, are formed on both the right side and the left side of each of the graphite strips 3.
  • an abrasive body with a working surface provided with five graphite strips or bars 3H, 3L, 3M, 3N, 3P such as that shown in Figure 5 advantageously has six lines of attack 9, 10, 11, 12, 13, 14 when the head rotates in a certain direction 29 (ie which act when the module advances in a direction 23), and six lines of attack 15, 16, 17, 18, 19, 20 which cut in the opposite direction to the preceding (ie which act when the module advances in a direction 24).
  • the method for forming the abrasive body 1 of the tool 26 comprises preparing a sintering mould 38 with precisely located inserts of soft inert material, preferably consisting of graphite bars 3, arranged to create a plurality of points or lines 4 along which the abrasive diamond granules attack the slab 35 being machined.
  • Said mould preparation involves the use of a mould having a hole of through profile which is closed at its base by a suitable insert 39.
  • Said insert matches the profile of said hole and has its upper or inner face 40 shaped and recessed to create the typical cylindrical convexity at the working surface 25 of the abrasive body 1 of the tool 26 to be formed.
  • a sheet of paper 41 on which parallelepiped graphite bars 3 are glued.
  • the mould defined in this manner is filled with bronze powder (90% copper, 10% tin) 1A acting as a binder, and diamond granules acting as the abrasive.
  • the powder 1A is then pressed with a force S by a presser block 42, also having a profile which matches that of the hole.
  • this hole can be expressed by a curvilinear perimeter 43 such as that shown on the drawings of Figures 3, 4, 5.
  • the mould is inserted into a usual sintering furnace, which incorporates and fixes the graphite bars 3 into the abrasive structure 2 of the tool 26 being formed, and to its rectangular steel base 30.
  • the said graphite bars 3 will be visible on the convex working surface 25 of the modular abrasive tool 26.
  • the paper 41 with which they were covered burns away during the sintering of said bronze powder 1A.
  • This method forms modular abrasive tools having a relatively coarse grain, and hence requiring cavities which during the abrasive action enable the removed hard particles to find a soft seat (graphite) into which they can penetrate in order not to scratch the machined slab, until they are expelled.
  • the abrasive "thread" remains constantly present along the tool cutting lines until it has worn away, because the graphite, which is less resistant to abrasion, tends to wear more than the working surfaces of the tool. As these latter are metallic and abrasive they are raised beyond the graphite surface. This greater graphite wear is favoured by the said abrasive sludge which the machining produces. This results in a better abrasive action of the tool 26 on the stone material of the slab 35 to be smoothed. As a consequence the machining rate is higher, with improved evacuation of the worn diamonds.
  • the perimetral shape 43 of the abrasive body 1 of the tool 26, shown on the accompanying drawings, has the ideal proportions to offer lateral lines of attack suitable for machining stone materials in general.
  • the oblique side taper in the geometrically radial direction and the rounding of the corners of the resultant trapezoid result in substantially uniform wear and cutting, and excellent removal of the residual abrasive sludge.
  • the tools 26 swing on the rotary head 28 about a radial axis 27 of it, with the result that in the end-of-swing positions, those parts 33 closest to the centre of rotation 31 (ie those of lower peripheral speed) are proportionally disengaged.
  • the abrasive line is of maximum length, as indicated by 44 in Figure 3.
  • the line of contact 7 between the abrasive body 1 and the slab 35 being machined is of minimum length 46.
  • the abrasive body 1 of tools 26 formed in accordance with the invention has an end part 21 tapering along two terminal portions 8, 22 which converge more than the more peripheral edges 36, 37. These portions 8, 22 are positioned in that region which when mounted on the machine head is closest to its centre or axis of rotation 31.
  • the abrasive body 1 has a shape which is completed by connecting curves 5 and 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'invention concerne un outil abrasif modulaire à oscillations radiales (27) pour têtes pivotantes de racleuses, lesquelles sont destinées à être utilisées sur du granit, du marbre, de la céramique, des composites résineux-silicieux, et similaires. Cet outil présente une forme à secteur angulaire effilé (36, 37) avec des inclinations convergentes, accentuées (21, 22) dans les parties à vitesse périphérique inférieure, ainsi qu'une structure apte à fournir plusieurs points (4, 9, 11) au niveau desquels la plaque usinée peut être soumise à une abrasion. Ces points dérivent de la coopération avec des éléments tendres (3), de préférence à base de graphite, qui interrompent la continuité de ladite structure abrasive.
PCT/IT1999/000381 1998-11-25 1999-11-24 Outil abrasif pour racleuses WO2000030812A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16792/00A AU1679200A (en) 1998-11-25 1999-11-24 Abrasive tool for smoothing machines

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI982560 IT1303872B1 (it) 1998-11-25 1998-11-25 Utensile modulare per macchine levigatrici per graniti,marmi,ceramiche,composti resinosilicei ed affini e procedimento per la sua
ITMI98A002560 1998-11-25
IT1999BG000053 IT1309502B1 (it) 1999-11-19 1999-11-19 Utensile abrasivo modulare oscillante per teste rotanti di macchinelevigatrici di graniti, marmi, ceramiche, composti resino-silicei e/o
ITBG99A000053 1999-11-19

Publications (1)

Publication Number Publication Date
WO2000030812A1 true WO2000030812A1 (fr) 2000-06-02

Family

ID=26330248

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1999/000381 WO2000030812A1 (fr) 1998-11-25 1999-11-24 Outil abrasif pour racleuses

Country Status (2)

Country Link
AU (1) AU1679200A (fr)
WO (1) WO2000030812A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1284175A3 (fr) * 2001-08-06 2003-04-23 Tullio Arcobello Outil, en particulier secteur diamanté pour machines de polissage de surfaces telles que d'agglomérés, de carreaux ou similaire
WO2013124797A1 (fr) 2012-02-20 2013-08-29 Tpm Verona S.R.L. Outil abrasif
CN104162850A (zh) * 2014-07-29 2014-11-26 郑州磨料磨具磨削研究所有限公司 一种砂轮节块的压制成型模具及压制成型方法
EP4182121B1 (fr) * 2020-07-15 2024-02-07 Premier S.R.L. Cylindre porte-outil et unité abrasive pour usinage de surface de matériaux céramiques ou en pierre

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776885A (en) * 1983-06-20 1988-10-11 Takeo Nakagawa Sintered composite materials with short metal fibers as matrix
EP0395162A1 (fr) * 1989-04-27 1990-10-31 Vincent S.P.A. Outil pour l'arbre moteur de machines de polissage de matériau en pierre ou similaire
US5076023A (en) * 1990-10-18 1991-12-31 Takeshi Saguchi Polishing-grindstone mount base assembly
EP0561610A1 (fr) * 1992-03-16 1993-09-22 De Beers Industrial Diamond Division (Proprietary) Limited Patin de polissage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776885A (en) * 1983-06-20 1988-10-11 Takeo Nakagawa Sintered composite materials with short metal fibers as matrix
EP0395162A1 (fr) * 1989-04-27 1990-10-31 Vincent S.P.A. Outil pour l'arbre moteur de machines de polissage de matériau en pierre ou similaire
US5076023A (en) * 1990-10-18 1991-12-31 Takeshi Saguchi Polishing-grindstone mount base assembly
EP0561610A1 (fr) * 1992-03-16 1993-09-22 De Beers Industrial Diamond Division (Proprietary) Limited Patin de polissage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1284175A3 (fr) * 2001-08-06 2003-04-23 Tullio Arcobello Outil, en particulier secteur diamanté pour machines de polissage de surfaces telles que d'agglomérés, de carreaux ou similaire
WO2013124797A1 (fr) 2012-02-20 2013-08-29 Tpm Verona S.R.L. Outil abrasif
CN104162850A (zh) * 2014-07-29 2014-11-26 郑州磨料磨具磨削研究所有限公司 一种砂轮节块的压制成型模具及压制成型方法
EP4182121B1 (fr) * 2020-07-15 2024-02-07 Premier S.R.L. Cylindre porte-outil et unité abrasive pour usinage de surface de matériaux céramiques ou en pierre

Also Published As

Publication number Publication date
AU1679200A (en) 2000-06-13

Similar Documents

Publication Publication Date Title
KR100523304B1 (ko) 연마 세그먼트를 갖춘 공구
EP0871562B1 (fr) Outil superabrasif ameliore
US12030121B2 (en) Method for producing a machining segment for the dry machining of concrete materials
TW482708B (en) Tool with ultra-fine cutting blade and processing tool with ultra-fine cutting blade
EP0985505A3 (fr) Lame de scie circulaire, lame de scie annulaire à tranchant interne et machine utilisant ces outils
CN1238717A (zh) 锯齿状研磨工具
JP2000512219A (ja) パターン化した粗粒分布を有する研磨工具とその製造方法
CA2350546C (fr) Procede permettant de fabrique des articles frittes et produits obtenus au moyen dudit procede
US6371103B1 (en) System of modular elements for machining marble, stone and the like
WO2002022310A1 (fr) Meule a grains tres abrasifs pour poli miroir
US4685440A (en) Rotary dressing tool
CN112677061B (zh) 一种钢铁打磨用钎焊金刚石磨盘及其制备方法
US5609518A (en) Grinding wheel for forming convex shapes, applicable in particular to manual grinders
US6793564B1 (en) Rotary tool with combined abrasive and fragmentation action for producing profiles or cuts on sheets of fragile material such as marble, granite, stone, glass and the like
WO2000030812A1 (fr) Outil abrasif pour racleuses
EP0138237A1 (fr) Segments et insertions diamantés
JPH07266239A (ja) ダイヤモンドコアビット
JPS6012694Y2 (ja) ダイヤモンドブレ−ド
JPH085014Y2 (ja) 電動カッターの刃体
JPH0715725Y2 (ja) 電着砥石
US7021307B1 (en) Rotary cutting saw
CN1072878A (zh) 振动磨削固结磨具及其修整工艺
JP7338924B1 (ja) ダイヤモンドドレッサの製造方法
JP3817023B2 (ja) セグメントチップの製造方法
EP4506103A1 (fr) Segment avec particules de diamant orientées et insert d'outil équipé des segments

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref country code: AU

Ref document number: 2000 16792

Kind code of ref document: A

Format of ref document f/p: F

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载