Tool for cutting processing and use of a cutting insert thereon
A tool for cutting processing has a base member which has a rotation axis about which the tool rotates during operation, a seat which is formed on the base member for receiving a replaceable cutting insert, a securing screw for securing the cutting insert to the seat, and a cutting insert which is secured to the seat. The seat has a base face for supporting a lower side of the cutting insert, a first lateral abutment face which supports the cutting insert in a radially inward direction, and a second lateral abutment face which supports the cutting insert axially and in a radially outward direction and a hole for receiving the securing screw is formed in the base face. The hole has with spacing from the base face a threaded hole and closer in the direction of the base face a thread-free hole portion.
1 . A tool for cutting processing, the tool comprising:
a base member having a rotation axis about which the tool rotates during operation;
a cutting insert being a replaceable cutting insert and having a lower side, a first lateral face, a second lateral face and a through-hole formed therein;
at least one seat formed on said base member and securing said cutting insert;
a securing screw for securing said cutting insert to said at least one seat;
said at least one seat having a base face for supporting said lower side of said cutting insert, a first lateral abutment face for abutting against said first lateral face of said cutting insert, said first lateral abutment face supporting said cutting insert in a radially inward direction, and a second lateral abutment face for abutting against said second lateral face of said cutting insert, said second lateral abutment face supporting said cutting insert axially and in a radially outward direction, said base face of said at least one seat further having a hole formed therein for receiving said securing screw, said hole has with spacing from said base face a threaded hole and closer in a direction of said base face a thread-free hole portion;
wherein said securing screw has a threaded portion for cooperating with said threaded hole, a head portion for supporting in said through-hole of said cutting insert and between said threaded portion and said head portion a thread-free shaft portion, said thread-free shaft portion has a smaller cross section than said thread-free hole portion;
wherein said cutting insert is secured to said at least one seat such that said head portion of said securing screw is supported on said through-hole of said cutting insert, said threaded portion of said securing screw cooperates with said threaded hole, and said head portion of said securing screw is resiliently deflected such that said thread-free shaft portion is supported when viewed in a direction perpendicular to said base face in a second quadrant which is disposed in the radially outward direction and axially in a direction of a free end of the tool on said thread-free hole portion; and
wherein said first lateral abutment face and said second lateral abutment face enclose in a viewing direction perpendicular to said base face an angle (α)<75° with each other.
2 . The tool according to claim 1 , wherein said thread-free shaft portion, in a fourth quadrant which is disposed in the radially inward direction and faces away from the free end of the tool, is spaced apart from said thread-free hole portion.
3 . The tool according to claim 1 , wherein said head portion of said securing screw has a largest cross section perpendicularly to an axis of said securing screw which is greater than a smallest cross section of said through-hole.
4 . The tool according to claim 1 , wherein a longitudinal axis of said threaded hole is offset in a plane of contact between said head portion of said securing screw and said through-hole of said cutting insert with respect to a longitudinal axis of said through-hole in a direction towards said first lateral abutment face and in a direction towards said second lateral abutment face.
5 . The tool according to claim 1 , wherein a surface normal of said first lateral abutment face has a radially outwardly directed direction component as a main component.
6 . The tool according to claim 1 , wherein a surface normal of said second lateral abutment face has an axial direction component and a radially inwardly directed direction component.
7 . The tool according to claim 1 , wherein a surface normal of said base face has a tangential direction component as a main component.
8 . The tool according to claim 1 , wherein a wall of said thread-free hole portion at least in the second quadrant, which is located in the radially outward direction and axially in a direction of the free end of the tool, of said hole is constructed to be curved in a concave manner at a hole side in a circumferential direction.
9 . The tool according to claim 1 , wherein said thread-free hole portion has a circular cross section.
10 . The tool according to claim 1 , wherein said thread-free hole portion is constructed parallel with said threaded hole.
11 . The tool according to claim 1 , wherein said first lateral abutment face and said second lateral abutment face enclose in a viewing direction perpendicular to the base face an angle (α)<65° with each other.
12 . A tool for cutting processing, the tool comprising:
a base member having a rotation axis about which the tool rotates during operation;
a cutting insert being a replaceable cutting insert and having a lower side, a first lateral face, a second lateral face and a through-hole formed therein;
at least one seat formed on said base member and securing said cutting insert;
a securing screw for securing said cutting insert to said at least one seat;
said at least one seat having a base face for supporting said lower side of said cutting insert, a first lateral abutment face for abutting against said first lateral face of said cutting insert, said first lateral abutment face supporting said cutting insert in a radially inward direction, and a second lateral abutment face for abutting against said second lateral face of said cutting insert, said second lateral abutment face supporting said cutting insert axially and in a radially outward direction, said base face of said at least one seat further having a hole formed therein for receiving said securing screw, said hole has with spacing from said base face a threaded hole and closer in a direction of said base face a thread-free hole portion;
wherein said securing screw has a threaded portion for cooperating with said threaded hole, a head portion for supporting in said through-hole of said cutting insert and between said threaded portion and said head portion a thread-free shaft portion, said thread-free shaft portion has a smaller cross section than said thread-free hole portion;
wherein said cutting insert is secured to said at least one seat such that said head portion of said securing screw is supported on said through-hole of said cutting insert, said threaded portion of said securing screw cooperates with said threaded hole, and said head portion of said securing screw is resiliently deflected such that said thread-free shaft portion is supported when viewed in a direction perpendicular to said base face in a second quadrant which is disposed in the radially outward direction and axially in a direction of a free end of the tool on said thread-free hole portion; and
wherein a longitudinal axis of said threaded hole is offset in a plane of contact between said head portion of said securing screw and said through-hole of said cutting insert with respect to a longitudinal axis of said through-hole in a direction towards said first lateral abutment face and in a direction towards said second lateral abutment face.
13 . The tool according to claim 12 , wherein said thread-free shaft portion, in a fourth quadrant which is disposed in the radially inward direction and faces away from the free end of the tool, is spaced apart from said thread-free hole portion.
14 . The tool according to claim 12 , wherein said head portion of said securing screw has a largest cross section perpendicularly to an axis of said securing screw which is greater than a smallest cross section of said through-hole.
15 . The tool according to claim 12 , wherein a surface normal of said first lateral abutment face has a radially outwardly directed direction component as a main component.
16 . The tool according to claim 12 , wherein a surface normal of said second lateral abutment face has an axial direction component and a radially inwardly directed direction component.
17 . The tool according to claim 12 , wherein a surface normal of said base face has a tangential direction component as a main component.
18 . The tool according to claim 12 , wherein a wall of said thread-free hole portion at least in the second quadrant, which is located in the radially outward direction and axially in a direction of the free end of the tool, of said hole is constructed to be curved in a concave manner at a hole side in a circumferential direction.
19 . The tool according to claim 11 , wherein said thread-free hole portion has a circular cross section.
20 . The tool according to claim 12 , wherein said thread-free hole portion is constructed parallel with said threaded hole.
21 . The tool according to claim 12 , wherein said first lateral abutment face and said second lateral abutment face enclose in a viewing direction perpendicular to the base face an angle (α)<65° with each other.