Curved face grooving blade and face grooving holder therefor
A curved face grooving blade having a curved grooving portion and a clamping portion connected thereto. The grooving portion having an insert seat defining upward and downward directions. The clamping portion has a bottom wedge surface located in an inward and downward direction relative to the remainder of the clamping portion.
1. A face grooving holder ( 102 ) comprising:
a shank portion ( 104 ) connected to a blade holder clamping portion ( 106 );
the blade holder clamping portion ( 106 ) comprising:
a clamping longitudinal axis (C 1 ) establishing a clamping forward-to-rearward direction (CF, CR);
a clamping vertical axis (C 2 ) perpendicular to the clamping longitudinal axis (C 1 ) and establishing a clamping upward-to-downward direction (CU, CD);
a clamping lateral axis (C 3 ) perpendicular to both the clamping longitudinal axis (C 1 ) and the clamping vertical axis (C 2 ), and establishing a clamping-first-side-to-clamping-second-side direction (CS 1 , CS 2 );
a clamping front end ( 130 ) and a clamping rear end ( 132 ) spaced apart from one another along the clamping longitudinal axis (C 1 );
a clamping top side ( 122 ) and a clamping bottom side ( 124 ) spaced apart from one another along the clamping vertical axis (C 2 );
a first clamping side ( 126 ) and a second clamping side ( 128 ) spaced apart from one another along the clamping lateral axis (C 3 ), the first clamping side ( 126 ) connecting the clamping top side ( 122 ) and the clamping bottom side ( 124 ); and
a blade clamping seat ( 108 ) formed along the second clamping side ( 128 ) and opening out to the clamping front end ( 130 );
the blade clamping seat ( 108 ) comprising:
a flexibility groove ( 136 ) opening out to both the second clamping side ( 128 ) and the clamping front end ( 130 );
a top clamping wedge surface ( 138 ) located upward of the flexibility groove ( 136 );
a bottom clamping wedge surface ( 144 ) located downward of the flexibility groove ( 136 );
a planar holder abutment surface ( 140 ) extending from the bottom clamping wedge surface ( 144 ) to the flexibility groove ( 136 ); and
a forwardly facing back stopper surface ( 146 ), located between the top clamping wedge surface ( 138 ) and the bottom clamping wedge surface ( 144 ) along the clamping vertical axis (C 2 ), and rearward of the holder abutment surface ( 140 ) along the clamping longitudinal axis (C 1 );
wherein the top clamping wedge surface ( 138 ) extends in a direction along the clamping longitudinal axis (C 1 ) farther than in directions along both the clamping vertical axis (C 2 ) and the clamping lateral axis (C 3 );
wherein the bottom clamping wedge surface ( 144 ) extends in said direction along the clamping longitudinal axis (C 1 ) farther than in directions along both the clamping vertical axis (C 2 ) and the clamping lateral axis (C 3 ); and
wherein in a front end view of the face grooving holder ( 102 ):
the bottom clamping wedge surface ( 144 ) is located downward of the top clamping wedge surface ( 138 ) along the clamping vertical axis (C 2 ), and farther than the top clamping wedge surface ( 138 ) in the second side direction (CS 2 ) along the clamping lateral axis (C 3 ); and
the top clamping wedge surface ( 138 ) and the bottom clamping wedge surface ( 144 ) converge in a direction away from the holder abutment surface ( 140 ).
2. The face grooving holder ( 102 ) according to claim 1 , wherein the holder abutment surface ( 140 ) defines a holder abutment plane (P 2 ) which forms an acute clamping angle β with the clamping downward direction (CD), fulfilling the condition: 10°≤β≤42°.
3. The face grooving holder ( 102 ) according to claim 2 , wherein the acute clamping angle β fulfills the condition: 19°≤β≤33°.
4. The face grooving holder ( 102 ) according to claim 1 , wherein the holder abutment surface ( 140 ) has a holder abutment surface area AA, and the blade clamping seat ( 108 ) has a seat area AS, the holder abutment surface area AA and the seat area AS fulfilling the condition 0.5AS≤AA≤AS.
5. The face grooving holder ( 102 ) according to claim 4 , fulfilling the condition 0.7AS≤AA≤0.95AS.
6. The face grooving holder ( 102 ) according to claim 1 , wherein, in the blade clamping seat ( 108 ), the flexibility groove ( 136 ) does not open out to the first clamping side ( 126 ).
7. The face grooving holder ( 102 ) according to claim 1 , wherein, in the blade clamping seat ( 108 ):
the top clamping wedge surface ( 138 ), the holder abutment surface ( 140 ), the bottom clamping wedge surface ( 144 ) and the forwardly facing back stopper surface ( 146 ) are integrally arranged to have one-piece monolithic construction.
8. A face grooving tool ( 100 ) comprising a face grooving blade ( 10 ) mounted in a face grooving tool holder ( 102 );
the face grooving blade ( 10 ) having a blade longitudinal axis (A 1 ) establishing a forward-to-rearward direction (DF, DR), and comprising:
a face grooving portion ( 12 ) and a clamping portion ( 14 ) connected to the face grooving portion;
the face grooving portion ( 12 ) comprising:
a concave inner surface ( 16 );
a convex outer surface ( 18 ) located on an opposing side of the face grooving portion ( 12 ) to the concave inner surface ( 16 );
a bottom surface ( 20 ) connecting the concave inner surface ( 16 ) and the convex outer surface ( 18 );
a top surface ( 22 ) located on an opposing side of the face grooving portion ( 12 ) to the bottom surface ( 20 ) and connecting the concave inner surface ( 16 ) and the convex outer surface ( 18 );
a front end surface ( 24 ) connecting the concave inner surface ( 16 ) and the convex outer surface ( 18 ) and connecting the top surface ( 22 ) and the bottom surface ( 20 );
a rear end surface ( 26 ) located on an opposing side of the face grooving portion ( 12 ) to the front end surface ( 24 ) and connecting the concave inner surface ( 16 ), the convex outer surface ( 18 ), the top surface ( 22 ) and the bottom surface ( 20 ); and
a first insert seat ( 28 ) formed at an intersection of the front end surface ( 24 ) and the top surface ( 22 ), and in turn comprising an upwardly facing first insert seat bottom surface ( 42 ) and a second insert seat surface ( 44 ) spaced apart therefrom;
an upward direction (DU) defined as being normal to an imaginary insert seat plane (P 3 ) of the first insert seat ( 28 ), at the first insert seat bottom surface ( 42 ) and a downward direction (DD) defined opposite to the upward direction (DU), the upward direction (DU) being perpendicular to the forward-to-rearward direction (DF, DR);
an outward direction (DO) defined as being in a direction perpendicular to the upward and downward directions (DU, DD) and also from in the concave inner surface ( 16 ) towards the convex outer surface ( 18 );
an inward direction (DI) defined as being opposite the outward direction (DO); and
the forward direction (DF) defined from the rear end surface ( 26 ) to the front end surface ( 24 ), and the rearward direction (DR) defined opposite to the forward direction (DF); and
the clamping portion ( 14 ) extends from the face grooving portion ( 12 ) in the outward direction (DO), and is recessed in the rearward direction from the face grooving portion's front end surface ( 24 ), the clamping portion ( 14 ) comprising:
a top wedge surface ( 52 );
a bottom wedge surface ( 54 ) located on an opposing side of the clamping portion ( 14 ) to the top wedge surface ( 52 );
a blade abutment surface ( 56 ) located between the top wedge surface ( 52 ) and the bottom wedge surface ( 54 ); and
a rear stopper abutment surface ( 57 ) located between the bottom wedge surface ( 54 ) and the top wedge surface ( 52 ), and facing in the rearward direction (DR);
wherein:
the bottom wedge surface ( 54 ) is located in the downward direction (DD) and the inward direction (DI) relative to the top wedge surface ( 52 ); and
the face grooving holder comprising:
a shank portion ( 104 ) connected to a blade holder clamping portion ( 106 );
the blade holder clamping portion ( 106 ) comprising:
a clamping longitudinal axis (C 1 ) establishing a clamping forward-to-rearward direction (CF, CR);
a clamping vertical axis (C 2 ) perpendicular to the clamping longitudinal axis (C 1 ) and establishing a clamping upward-to-downward direction (CU, CD);
a clamping lateral axis (C 3 ) perpendicular to both the clamping longitudinal axis (C 1 ) and the clamping vertical axis (C 2 ), and establishing a clamping-first-side-to-clamping-second-side direction (CS 1 , CS 2 );
a clamping front end ( 130 ) and a clamping rear end ( 132 ) spaced apart from one another along the clamping longitudinal axis (C 1 );
a clamping top side ( 122 ) and a clamping bottom side ( 124 ) spaced apart from one another along the clamping vertical axis (C 2 );
a first clamping side ( 126 ) and a second clamping side ( 128 ) spaced apart from one another along the clamping lateral axis (C 3 ), the first clamping side ( 126 ) connecting the clamping top side ( 122 ) and the clamping bottom side ( 124 ); and
a blade clamping seat ( 108 ) formed along the second clamping side ( 128 ) and opening out to the clamping front end ( 130 );
the blade clamping seat ( 108 ) comprising:
a flexibility groove ( 136 ) opening out to both the second clamping side ( 128 ) and the clamping front end ( 130 );
a top clamping wedge surface ( 138 ) located upward of the flexibility groove ( 136 );
a holder abutment surface ( 140 ) located downward of the top clamping wedge surface ( 138 );
a bottom clamping wedge surface ( 144 ) located downward of the flexibility groove ( 136 ) on an opposing side of the holder abutment surface ( 140 ) from the top clamping wedge surface ( 138 ); and
a forwardly facing back stopper surface ( 146 ), located between the top clamping wedge surface ( 138 ) and the bottom clamping wedge surface ( 144 ) along the clamping vertical axis (C 2 ), and rearward of the holder abutment surface ( 140 ) along the clamping longitudinal axis (C 1 );
wherein the top clamping wedge surface ( 138 ) extends in a direction along the clamping longitudinal axis (C 1 ) farther than in directions along both the clamping vertical axis (C 2 ) and the clamping lateral axis (C 3 );
wherein the bottom clamping wedge surface ( 144 ) extends in said direction along the clamping longitudinal axis (C 1 ) farther than in directions along both the clamping vertical axis (C 2 ) and the clamping lateral axis (C 3 ); and
wherein in a front end view of the face grooving holder ( 102 ):
the bottom clamping wedge surface ( 144 ) is located downward of the top clamping wedge surface ( 138 ) along the clamping vertical axis (C 2 ), and farther than the top clamping wedge surface ( 138 ) in the second side direction (CS 2 ) along the clamping lateral axis (C 3 ); and
the top clamping wedge surface ( 138 ) and the bottom clamping wedge surface ( 144 ) converge in a direction away from the holder abutment surface ( 140 ).
9. The face grooving tool ( 100 ) according to claim 8 , wherein:
the blade's top wedge surface ( 52 ) abuts the holder's top clamping wedge surface ( 138 );
the blade's bottom wedge surface ( 54 ) abuts the holder's bottom clamping wedge surface ( 144 );
the blade's blade abutment surface ( 56 ) abuts the holder's holder abutment surface ( 140 ); and
the blade's rear stopper abutment surface ( 57 ) abuts and the holder's back stopper surface ( 146 ).
10. The face grooving tool ( 100 ) according to claim 9 , wherein:
the holder's blade clamping seat ( 108 ) has a seat area AS; and
a surface contact area PA between the blade abutment surface ( 56 ) and the seat area AS fulfills the condition: PA>0.30AS.
11. The face grooving tool ( 100 ) according to claim 10 , wherein the surface contact area PA fulfills the condition: PA>0.55AS.
12. The face grooving tool ( 100 ) according to claim 11 , wherein the surface contact area PA fulfills the condition: PA>0.70AS.