EP0059360A2 - Werkzeug für Bearbeitungsmaschinen für Marmor, Granit und ähnliche Platten - Google Patents

Werkzeug für Bearbeitungsmaschinen für Marmor, Granit und ähnliche Platten Download PDF

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Publication number
EP0059360A2
EP0059360A2 EP82101102A EP82101102A EP0059360A2 EP 0059360 A2 EP0059360 A2 EP 0059360A2 EP 82101102 A EP82101102 A EP 82101102A EP 82101102 A EP82101102 A EP 82101102A EP 0059360 A2 EP0059360 A2 EP 0059360A2
Authority
EP
European Patent Office
Prior art keywords
tool bit
disk
granite
marble
dressing
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.)
Withdrawn
Application number
EP82101102A
Other languages
English (en)
French (fr)
Other versions
EP0059360A3 (de
Inventor
Sauro Pignatti
Emanuele Pellegrinuzzi
Sandro Gallerani
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.)
Udl Di Pellegrinuzzi Emanuele & C SNC
Original Assignee
Udl Di Pellegrinuzzi Emanuele & C SNC
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 Udl Di Pellegrinuzzi Emanuele & C SNC filed Critical Udl Di Pellegrinuzzi Emanuele & C SNC
Publication of EP0059360A2 publication Critical patent/EP0059360A2/de
Publication of EP0059360A3 publication Critical patent/EP0059360A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to a tool bit for marble, granite and the like slab and dressing machines.
  • the invention is suitable for use on dressing machines employed in the marble, granite, and the like industry, and on machines for floor dressing.
  • the surface working tools comprise a plurality of disk-like grinding wheels which are mounted at the bottoms of respective planets of a planetary system incorporated to the machine drive.
  • the grinding wheels are mounted on a single rotatively driven plate, and in this particular case the grinding wheels, while having a similar composition, have different shapes and grains from those utilized for granite dressing.
  • an effective dressing of the surfaces involves a high number of passes for each of the roughing, dressing, and polishing steps.
  • the grinding wheels, or abrasive wheels have to be frequently replaced because of their fast wearing properties, and within the span of the same work day an operator has to be provided with a number of spares, as well as a large variety of different grain wheels.
  • the grinding wheels are presently cemented directly to metal heads adapted to be threaded onto the respective planets of the machine; thus, in addition to the job costs being significantly affected by the grinding wheel wear, further labour costs are introduced for preparing such heads, which have to be freed of any residue of the worn out wheel and made ready to accept a fresh grinding wheel.
  • Another disadvantageous feature of conventional grinding wheels is that the material from which the wheels are formed is affected by such environmental factors as moisture and ageing. Thus, it occurs that grinding wheels having the same composition and grain may wear in different degrees, depending on the surface hardness thereof, as determined by their ageing or the environment humidity; some wheels may tend to break, while others may be wholly ineffective on account of their excessively high surface hardness.
  • a further object of this invention is to provide conventional dressing machines with a tool bit which is simple to manufacture, easily and quickly mounted and replaced, and of comparatively low cost.
  • a tool bit for marble, granite, and the like slab and dalle dressing machines characterized in that it comprises a plurality of small abrasive material plates associated in cantilever relationship to the bottom face of a metal backing disk, said disk being adapted to be mounted rigid with the machine own drive for rotation therewith.
  • the machine 1 includes a machine body 2 which is provided, at the rear thereof, with wheels 3, whereby. the machine 1 can be moved across a surface 4 to be dressed with a number of passes.
  • the front end of the machine 1 is caused to bear onto the surface 4 through a power driven tool holder assembly 5.
  • the assembly 5 would comprise a planetary system driving respective planets, whereto heads 10 are threadably engaged which carry, depending therefrom, a disk-like grinder 11 of conventional design, as shown schematically in Figure 2.
  • the reference numeral 12 designates a tool bit which, in accordance with this invention, comprises a plurality of small plates 13 attached in cantilever relationship to the bottom face of a metal backing disk 14 which is adapted for mounting on the assembly 5 of the machine; it is contemplated that the heads 10 may be utilized, rather than to hold a disk grinder 11, to hold a tool bit 12, and this especially with machines equipped for bidirectional rotation of the planetary system, where rotation in either of the two directions could result in their coming loose.
  • the tool bit 12 is snugly fitted into the seat for said grinder 11, which is peripherally delimited by the rim 7, and provided with two diametrically opposed holes for accommodating attachment screws to the head 10.
  • the plates 13 are welded to the disk 14 and advantageously arranged along the outer ring portion of the disk.
  • the weld is quite conventional, and is effected with added material by means of an oxyacetylene flame.
  • the plates 13 have a parallelepipedal configuration, and are provided with a face 13a, wherewith they can bear onto the surface 4, and a sharp edge 13b facing in the direction of rotation of the assembly 5.
  • the plates 13 would be parallelepipedons of rectangular base, having their axes substantially inclined relatively to the radial direction.
  • the tool bit 12 would carry,at the bottom,plates 13 of disk-like configuration, such as shown in Figure 4.
  • the disk 14a is provided,at the top,with a threaded hole 15, whereby the disk can be threaded to the respective planet in the assembly 5.
  • the disk 14b has the same diameter as the plate 6, whereto it is adapted to be assembled rigidly.
  • the disk 4b has a rim which defines at the top a cutout 16 adapted to accommodate the rim 7 of the plate 6, Moreover, the disk 14b has an axial shaped throughgoing hole 17, the outline whereof defines notches 18 adapted to accommodate the spurs 8 of the-. plate 6.
  • the tool bit 12 is adapted to be mounted on traditional dressing machines, and is capable'of exerting, on the surface 4, both an abrasive action and a shearing action, respectively by means of the face 13a and edge 13b of the plate 13.
  • the weight of the machine 1 is mainly applied to the assembly 5 carrying the tool bits 12, and that the abrasive action is dominant with respect to the shearing action proportionately to the number of plates 13 carried by each tool bit 12. Furthermore, depending on the inclination of the axis of the plates 13 relatively to the radial direction, the shearing action is more or less pronounced. In particular, it has been found that, with an inclination of 20 to 30 degrees, the plate undergoes a uniform wear. Finally, with plates 13 of disk-like shape, it is the abrasive action which prevails, and the tool bits 12 which carry disk-like plates are mainly utilized for floor finishing purposes, following installation, or for slab dressing. In such situations, in fact, no deep action. is required because the flatness of the surface to be dressed is then ensured.
  • both the roughing step and dressing step are effected in a single pass, instead of the three passes required for each step when conventional grinders are utilized. This enables a considerable reduction of the job time, and the' complete elimination of deadtime for the replacement of the tool bits.
  • the plates 13 wear out to a considerably lesser extent than conventional grinders, thereby the tool cost affects the job costs to a more limited extent. It should be noted, moreover, that the manufacture of the tool bits described hereinabove is made extremely simple, and that it is possible to fully recover the worn out material by unwelding the plates and grinding the bottom face of the backing disk to produce a renewed tool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP82101102A 1981-02-26 1982-02-15 Werkzeug für Bearbeitungsmaschinen für Marmor, Granit und ähnliche Platten Withdrawn EP0059360A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4001481 1981-02-26
IT40014/81A IT1146260B (it) 1981-02-26 1981-02-26 Utensili di macchine per la levigatura di lastre e pavimentazioni di marmo, granito e simili

Publications (2)

Publication Number Publication Date
EP0059360A2 true EP0059360A2 (de) 1982-09-08
EP0059360A3 EP0059360A3 (de) 1983-03-30

Family

ID=11246539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101102A Withdrawn EP0059360A3 (de) 1981-02-26 1982-02-15 Werkzeug für Bearbeitungsmaschinen für Marmor, Granit und ähnliche Platten

Country Status (2)

Country Link
EP (1) EP0059360A3 (de)
IT (1) IT1146260B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604011A (en) * 1983-02-08 1986-08-05 Dr. Techn. Ernst Linsinger & Co. Gmbh Method and apparatus for edge-planing sheet metal
US4607458A (en) * 1985-04-08 1986-08-26 The United States Of America As Represented By The Secretary Of The Air Force Very high speed lap with negative lift effect
US4612733A (en) * 1985-04-08 1986-09-23 The United States Of America As Represented By The Secretary Of The Air Force Very high speed lap with positive lift effect
US4627195A (en) * 1985-09-18 1986-12-09 The United States Of America As Represented By The Secretary Of The Air Force Computer controller optical surfacing (CCOS) lap pressure control system
EP0627281A2 (de) * 1990-03-30 1994-12-07 Ronald Carlysle Wiand Drehschleifkissen zur Fertigung von Marmer, Granit und Gestein
US6392939B1 (en) * 2000-01-21 2002-05-21 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device with improved defect elimination rate
GB2375496A (en) * 2001-05-15 2002-11-20 Garage Doctors Ltd Grinding and painting floors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE337022A (de) *
CH399229A (de) * 1963-01-22 1966-03-31 Baumberger & Co Ag Schleifscheibe
CH486292A (it) * 1968-02-03 1970-02-28 Para Silvio Mola abrasiva per macchina lucidatrice
DE2011516A1 (de) * 1969-03-07 1970-09-10 Norton Company, Worcester, Mass. (V.St.A.) Schleifwerkzeuge mit Metallverband und Herstellungsverfahren
DE2233044A1 (de) * 1972-07-05 1974-01-17 Sim Sa Ets Planschleifmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE337022A (de) *
CH399229A (de) * 1963-01-22 1966-03-31 Baumberger & Co Ag Schleifscheibe
CH486292A (it) * 1968-02-03 1970-02-28 Para Silvio Mola abrasiva per macchina lucidatrice
DE2011516A1 (de) * 1969-03-07 1970-09-10 Norton Company, Worcester, Mass. (V.St.A.) Schleifwerkzeuge mit Metallverband und Herstellungsverfahren
DE2233044A1 (de) * 1972-07-05 1974-01-17 Sim Sa Ets Planschleifmaschine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604011A (en) * 1983-02-08 1986-08-05 Dr. Techn. Ernst Linsinger & Co. Gmbh Method and apparatus for edge-planing sheet metal
US4607458A (en) * 1985-04-08 1986-08-26 The United States Of America As Represented By The Secretary Of The Air Force Very high speed lap with negative lift effect
US4612733A (en) * 1985-04-08 1986-09-23 The United States Of America As Represented By The Secretary Of The Air Force Very high speed lap with positive lift effect
US4627195A (en) * 1985-09-18 1986-12-09 The United States Of America As Represented By The Secretary Of The Air Force Computer controller optical surfacing (CCOS) lap pressure control system
EP0627281A2 (de) * 1990-03-30 1994-12-07 Ronald Carlysle Wiand Drehschleifkissen zur Fertigung von Marmer, Granit und Gestein
EP0627281A3 (de) * 1990-03-30 1994-12-21 Ronald Carlysle Wiand Drehschleifkissen zur Fertigung von Marmer, Granit und Gestein
US6392939B1 (en) * 2000-01-21 2002-05-21 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device with improved defect elimination rate
GB2375496A (en) * 2001-05-15 2002-11-20 Garage Doctors Ltd Grinding and painting floors

Also Published As

Publication number Publication date
IT1146260B (it) 1986-11-12
IT8140014A0 (it) 1981-02-26
EP0059360A3 (de) 1983-03-30

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Inventor name: PIGNATTI, SAURO

Inventor name: PELLEGRINUZZI, EMANUELE

Inventor name: GALLERANI, SANDRO