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US20080032613A1 - Lapping Head for Machining Workpieces of Hard Stone Materials - Google Patents

Lapping Head for Machining Workpieces of Hard Stone Materials Download PDF

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Publication number
US20080032613A1
US20080032613A1 US11/630,728 US63072805A US2008032613A1 US 20080032613 A1 US20080032613 A1 US 20080032613A1 US 63072805 A US63072805 A US 63072805A US 2008032613 A1 US2008032613 A1 US 2008032613A1
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US
United States
Prior art keywords
tools
group
vertical axis
circumferentially equidistant
distance
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.)
Abandoned
Application number
US11/630,728
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English (en)
Inventor
Dario Toncelli
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20080032613A1 publication Critical patent/US20080032613A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • B24B41/0475—Grinding heads for working on plane surfaces equipped with oscillating abrasive blocks, e.g. mounted on a rotating head
    • 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
    • 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

Definitions

  • the present invention relates to a lapping head for machining workpieces of hard stone materials, such as granite, porcelain-see, ceramic material or agglomerate materials made using the Bretonstone technology, obtained by mixing together inert materials such as silica or quartz with organic binders such as polyester resins or inorganic binders such as Portland cement.
  • lapping heads with oscillating segments are conventionally used, namely heads which comprise a body rotating about a vertical axis and having, mounted thereon, a number of arms oscillating about an axis which is horizontal and arranged radially with respect to the rotary vertical axis of the head.
  • the bottom end of each arm has a tool holder on which a tool or abrasive segment is mounted. It should be noted that all the arms have identical dimensions and also the tools have the same dimensions with the result that all the tools are arranged along a circumference at the same distance from the vertical axis of rotation.
  • each of the arms are caused to swing about its radial axis of oscillation and therefore also the corresponding tool or abrasive segment is caused to swing which thus maintains a cylindrical cutting profile also during the wear process.
  • the lapping/polishing action occurs as a result of the rotational movement of the abrasive tools about the vertical axis of rotation of the head, while each diamond tool (which has a working surface consisting of a cylindrical portion) swings about its radial axis of oscillation and always ensures a tangential contact of the tool with the workpiece being machined.
  • the tools cover a circular ring, leaving necessarily uncovered a circular area in the centre of the head, for the purpose of allowing oscillation of the arms without collision between the adjacent tools.
  • the lapping heads are then mounted on machinery known as lapping machines or polishing machines, depending on the lesser or greater finishing requirements of the machined workpieces.
  • Lapping machines comprise a bench with a moving belt on which the material to be lapped rests and a beam positioned above the belt and arranged parallel with the said belt.
  • Various rotary spindles are mounted in an aligned manner along the beam and at the bottom end of each of them a lapping head provided with diamond tools is mounted, as explained above.
  • each lapping head is driven into rotation about its vertical axis and each tool swings about its radial axis of oscillation.
  • the heads are pressed toward the workpiece to be machined so that the tools are brought into contact at a given pressure against the said material and, owing to their swinging movement, are able to perform the lapping of hard materials since a high specific pressure is generated along the tangential line of contact, whereby an aggressive action is exerted on the stone material.
  • the back and forth movement of the beam instead allows lapping of the workpiece, usually in the form of slabs, over its entire surface.
  • any such defects may be visually perceived, in particular by a well-trained eye, so that they have a negative effect on the final quality of the finished product.
  • the product obtained may be of a partly diminished quality due to these defects, particularly in case of some types of material and/or shades of colour.
  • the head tends to “collapse” on the side where the tools do not rest completely on the material to be lapped.
  • seizing effects can also take place, namely during deceleration the head can seize on the workpiece, causing a jerky braking action which further worsens the situation.
  • the object of the present invention is therefore to envisage a new head for lapping/polishing workpieces of hard materials or in any case to provide the polishing head with particular contrivances which make the above mentioned surface defects invisible, or nearly so, to the naked eye.
  • a lapping/polishing head for workpieces of hard stone materials comprising a body rotating about a vertical axis and having tools mounted thereon, each tool swinging about an axis arranged radially with respect to said vertical axis and the said tools being circumferentially equidistant from each other, characterized in that said tools are divided into at least two groups of tools, each group being positioned at a distance from said vertical axis different from that of each other group, the tools of each group being equidistant from said vertical axis and arranged in a circumferentially equidistant manner with respect to each other.
  • the tools are six in number, circumferentially equidistant from each other, so as to form an angle of 60° relative to each other
  • said six tools are divided into two groups, each group consisting of three tools circumferentially equidistant from each other so as to form an angle of 120° relative to each other.
  • the tools of a group are arranged on a circumference which is smaller than the other and outer circumference and this is possible due to the fact that the 120° spacing between tools of a same group prevents them to collide during their swinging movement.
  • the pressing force of the head exerted on the material is therefore always suitably balanced and in any case sufficient to ensure an optimum operation of the heads, avoiding also the risk of seizure.
  • FIGS. 1 a and 1 b show, respectively, cross-sectioned and from below, a conventional lapping head, where it is possible to note the six tools all arranged on a single outer circumference, wherefrom a large, exposed, central circular area is provided for preventing collision between adjacent tools during oscillation;
  • FIGS. 2 a , 2 b show views, similar to the preceding views, of a lapping head according to the present invention.
  • FIGS. 2 a , 2 b , 10 denotes overall a lapping head for machining workpieces of hard stone materials such as, for example, granite, ceramic materials, preferably or agglomerate obtained by means of Bretonstone technology using silica or quartz-based inerts.
  • the lapping head 10 comprises a box-like body 12 with an approximately cylindrical shape rotating about a vertical axis Y and having a plurality of arms 14 mounted on its bottom side. At the bottom end of each arm 14 there is a tool-holder 18 on which a diamond coated tool 20 is mounted.
  • the head 10 has six arms 14 a,b,c,d,e,f which are mounted on the body 12 so as to be able to swing about respective axes of oscillation 16 a,b,c,d,e,f .
  • the bottom side of each arm 14 a,b,c,d,e,f carries a tool-holder respectively denoted by 18 a,b,c,d,e,f on which a diamond tool 20 a,b,c,d,e,f is fixed.
  • the axes of rotation 16 a,b,c,d,e,f of the arms 14 a,b,c,d,e,f are arranged in a circumferentially equidistant manner, namely spaced by 60° with respect to each other.
  • the box-shaped body 12 houses driving means 12 which, owing to the rotational movement about the axis Y imparted to the lapping head, transmit the swinging movement to each of the six arms 14 a,b,c,d,e,f .
  • driving means 12 which, owing to the rotational movement about the axis Y imparted to the lapping head, transmit the swinging movement to each of the six arms 14 a,b,c,d,e,f .
  • the six oscillating arms 14 a,b,c,d,e,f are of two types so as to form two separate groups: a first group consisting of the arms 14 a,c,e and a second group consisting of the arms 14 b,d,f . Both groups comprise three arms which are mounted on the head 10 so as to be circumferentially equidistant, forming an angle of 120° relative to each other, and equidistant from the vertical axis of rotation Y.
  • the second group of arms 14 b,d,f is such that the respective tool-holders 18 b,d,f are positioned at a distance from the vertical axis of rotation Y smaller than the corresponding distance of the tool-holders 18 a,c,e of the first group of arms 14 a,c,e so that the tools 20 b,d,f supported by the second group of oscillating arms 14 b,d,f are also situated at a distance from the axis Y smaller than that of the tools 20 a,c,e supported by the first group of oscillating arms 14 a,c,e.
  • the tools of each group therefore define a radial extension defined by their maximum and minimum distance from the vertical axis Y. Since the difference in the distance of the tool-holders 18 a,b,c,d,e,f from the vertical axis Y, between the two groups of arms, is less than the radial length of the tools 20 a,b,c,d,e,f , an intermediate circular zone or band is formed on the workpiece which is subject to the action of both groups of tools.
  • the workpiece is thus polished in an optimum manner and does not show any visible surface defect along its side edges.
  • the arrangement of one group of tools could be of such a radial extension that it does not to result in partial overlapping relative to the tools of the other group, in particular the two groups of tools can be adjacent.
  • the tools instead of all being of the same radial length, could have a varied length.
  • the tools in each group could be of the same length, but the length of the tools in one group could be other than the length of the tools in the other group.
  • the lapping/polishing head could have a different number of arms such as, for example, a head with nine arms, and therefore nine tools, circumferentially equidistant from each other so as to form an angle of 40° relative to each other.
  • the nine arms and tools may be subdivided into three groups of even number, each group being arranged at a different distance from the vertical axis Y and in such a way that the tools of each group are circumferentially equidistant from each other at an angle of 120° relative to each other.
  • the nine arms and tools which are circumferentially equidistant from each other so as to form an angle of 40° relative to each other, could be subdivided into two groups: a first group of three arms and three tools circumferentially equidistant from each other so as to form an angle of 120° relative to each other and arranged at a smaller distance from the vertical axis Y than the second group of six arms and six tools arranged in pairs and circumferentially equidistant from each other so as to form an angle of 120° relative to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
US11/630,728 2004-06-24 2005-06-17 Lapping Head for Machining Workpieces of Hard Stone Materials Abandoned US20080032613A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000311U ITMI20040311U1 (it) 2004-06-24 2004-06-24 Testa di le igatura per materiali lapidei duri
ITMI2004U000311 2004-06-24
PCT/EP2005/052827 WO2006000542A1 (fr) 2004-06-24 2005-06-17 Tete de rubanage pour usiner des pieces a travailler faites de materiaux en pierre dure

Publications (1)

Publication Number Publication Date
US20080032613A1 true US20080032613A1 (en) 2008-02-07

Family

ID=34972308

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/630,728 Abandoned US20080032613A1 (en) 2004-06-24 2005-06-17 Lapping Head for Machining Workpieces of Hard Stone Materials

Country Status (6)

Country Link
US (1) US20080032613A1 (fr)
KR (1) KR20070024587A (fr)
CA (1) CA2568005A1 (fr)
ES (1) ES2304865B1 (fr)
IT (1) ITMI20040311U1 (fr)
WO (1) WO2006000542A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1396807B1 (it) * 2009-11-25 2012-12-14 Toncelli Macchina di levigatura o lucidatura di lastre di materiale lapideo, quale pietra naturale e agglomerata, ceramico e vetro.
CH710753B1 (de) 2015-02-18 2019-03-29 Airtec Ag Federelement zu Montage auf der Basis einer Bodenbearbeitungsmaschine.
IT202000004387A1 (it) * 2020-03-02 2021-09-02 Ancora Spa Testa per il trattamento di lastre in materiale ceramico e simili

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105634A (en) * 1936-04-10 1938-01-18 Marbriere De Paris Sa Soc Machine for facing the surfaces of hard substances by pressure
US4646473A (en) * 1984-05-08 1987-03-03 Udviklingscentret Hansen Method and apparatus for finishing surfaces
US4965965A (en) * 1988-07-06 1990-10-30 Wallin Sven E Grinding head for surfacing and polishing stone, marbles and other hard materials
US5161331A (en) * 1990-03-17 1992-11-10 Officine Meccaniche F.Lli Zambon S.N.C Rotating head having oscillating blocks for leveling and polishing surfaces of granite, ceramic or marble
US6234887B1 (en) * 1997-11-03 2001-05-22 Hh Patent A/S Method for sanding surfaces on items
US6273799B1 (en) * 1997-04-14 2001-08-14 Pedrini, S.P.A. Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1247256B (it) * 1991-04-23 1994-12-12 Simec Spa Testa per la lucidatura di marmo, granito e materiali lapidei in genere con mole oscillanti.
IT1263400B (it) * 1993-09-22 1996-08-05 Luca Toncelli Perfezionamenti a testa levigatrice e lucidatrice per graniti e pietresimili
IT1267682B1 (it) * 1994-02-09 1997-02-07 Simec Spa Testa di lucidatura, particolarmente per lastre di marmo, granito, gres porcellanato ed altri materiali lapidei
ES2188122T3 (es) * 1999-04-16 2003-06-16 F I M A D S R L Maquina de pulir que comprende un cabezal portando una pluralidad de sectores de pulir con una estructura segmentada y resiliente.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2105634A (en) * 1936-04-10 1938-01-18 Marbriere De Paris Sa Soc Machine for facing the surfaces of hard substances by pressure
US4646473A (en) * 1984-05-08 1987-03-03 Udviklingscentret Hansen Method and apparatus for finishing surfaces
US4965965A (en) * 1988-07-06 1990-10-30 Wallin Sven E Grinding head for surfacing and polishing stone, marbles and other hard materials
US5161331A (en) * 1990-03-17 1992-11-10 Officine Meccaniche F.Lli Zambon S.N.C Rotating head having oscillating blocks for leveling and polishing surfaces of granite, ceramic or marble
US6273799B1 (en) * 1997-04-14 2001-08-14 Pedrini, S.P.A. Polishing head for plate materials in granite, hard stone or ceramic with abrasive segments having continuous oscillating tangential motion
US6234887B1 (en) * 1997-11-03 2001-05-22 Hh Patent A/S Method for sanding surfaces on items

Also Published As

Publication number Publication date
ES2304865A1 (es) 2008-10-16
ES2304865B1 (es) 2009-10-27
CA2568005A1 (fr) 2006-01-05
ITMI20040311U1 (it) 2004-09-24
WO2006000542A1 (fr) 2006-01-05
KR20070024587A (ko) 2007-03-02

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