TOOL-HOLDER CYLINDER AND ABRASIVE UNIT FOR SURFACE MACHINING OF STONE OR CERAMIC MATERIALS
Described is a tool-holder cylinder ( 100; 300 ) for supporting abrasive tools, designed to be attached to a head ( 71 ) of a machine tool for surface machining of ceramic and/or stone materials, wherein said head ( 71 ) is configured to rotate about a first axis (x) substantially parallel to a surface to be machined and coinciding with the axis of central symmetry of said cylinder ( 100; 300 ), said cylinder ( 100; 300 ) comprising an upper surface ( 120; 320 ), a lower surface ( 130; 330 ), and a side surface ( 160; 360 ) parallel to the first axis (x) and on which are formed a plurality of seats ( 111; 311 ) designed to house said abrasive tools by means of a dovetail coupling, characterised in that said seats ( 111; 311 ) have a first tapering which extends perpendicularly and away from the first axis (x), and a second tapering parallel to the first axis (x). The invention further relates to an abrasive unit comprising a cylinder of the said type and to a machine comprising said abrasive unit.
1 . A machine tool for lapping surface machining of ceramic and/or stone materials, comprising
at least one head ( 71 ) configured to rotate about a first axis (x) substantially parallel to a surface to be machined, and mounted on
a support ( 70 ) configured to rotate about a second axis (z) perpendicular to the first axis (x) and to the surface to be machined, characterized in comprising
a tool-holder cylinder ( 100 ; 300 ) designed to be attached to the at least one head ( 71 ) so as to rotate about the first axis (x), and having
an axis of central symmetry coinciding with the first axis (x),
an upper surface ( 120 ; 320 ), a lower surface ( 130 ; 330 ), and
a side surface ( 160 ; 360 ) parallel to the first axis (x) and on which are formed a plurality of seats ( 111 ; 311 ) designed to house fickert abrasive tools for lapping operations, wherein
the seats ( 111 ; 311 ) house the abrasive tools by means of a dovetail coupling and have a first tapering which extends perpendicularly and away from the first axis (x), and a second tapering parallel to the first axis (x).
2 . The machine tool according to claim 1 , characterised in that the second tapering extends towards the lower surface ( 130 ) of the cylinder ( 100 ).
3 . The machine tool according to claim 1 , characterised in that the second tapering extends towards the upper surface ( 320 ) of the cylinder ( 300 ).
4 . The machine tool according to claim 1 ,
characterised in comprising
a cavity ( 132 ; 332 ) provided with an opening ( 131 ; 331 ) and configured to house said machine tool head ( 71 ), and in that it comprises
at least one hole ( 250 ; 340 , 350 ) passing through its upper surface ( 120 ; 320 ).
5 . The machine tool according to claim 4 , characterised in that the cavity ( 132 ; 332 ) has an inner side wall ( 133 ; 333 ) and a bottom wall ( 134 ; 334 ), opposite the opening ( 131 ; 331 ) and having a smaller diameter than the opening ( 131 ; 331 ), wherein
the inner side wall ( 133 ; 333 ) comprises a first conical portion ( 135 ; 335 ), which starts at the bottom wall ( 134 ; 334 ) and whose diameter increases in the direction of the opening ( 131 ; 331 ), and a second portion ( 136 ; 336 ), cylindrical with constant diameter, which is contiguous with the first portion ( 135 ; 335 ) and ends at the opening ( 131 ; 331 ).
6 . The machine tool according to claim 1 , wherein the head ( 71 ) of the machine tool has a top surface ( 711 ) and at least one hole ( 714 ) for inserting means for attaching to said cylinder ( 100 ).
7 . The machine tool according to claim 6 , characterised in that it comprises a plate ( 8 ) designed to make contact with the abrasive tools inserted in the seats ( 111 ) and provided with a through hole ( 83 ), coaxial to the hole of the cylinder ( 300 ) and to the hole ( 714 ) of the head ( 71 ), for housing means for attaching to the head ( 71 ).
8 . The machine tool according to claim 5 , wherein
the head ( 71 ) of the machine tool has an upper surface ( 711 ) and at least one hole ( 714 ) for inserting attachment means, characterised in that it comprises
a spacer ( 9 ), designed to be interposed between the bottom wall ( 334 ) of the cavity ( 332 ) of the cylinder ( 300 ) and the upper surface ( 711 ) of the head ( 71 ) of the machine tool, and comprising
an upper face ( 91 ) designed to make contact with the bottom wall ( 334 ) of the cylinder ( 300 ),
a lower face ( 92 ), designed to make contact with the upper surface ( 711 ) of the head ( 71 ) and having a larger diameter than the upper face ( 91 ),
a side surface ( 90 ), designed to make contact with the first portion ( 335 ) of the inner side wall ( 333 ) of the cylinder ( 300 ),
a first hole ( 93 ), coaxial with the hole ( 340 ) of the cylinder ( 300 ), for housing means for attaching to the cylinder ( 300 ), and
at least a second hole ( 94 ), for housing means of attachment to the head ( 71 ).
9 . The machine tool according to claim 8 , characterised in that it comprises a plate ( 8 ) designed to make contact with the upper surface ( 320 ) of the cylinder ( 300 ) and provided with a through hole ( 83 ), coaxial to the hole ( 340 ) of the cylinder ( 300 ) and to the first hole ( 93 ) of the spacer ( 9 ), for housing means for attachment to the spacer ( 9 ).