Cutting blade having a clamping bore with a coolant inlet, blade holder and cutting tool
A cutting tool with a coolant system having a cutting blade, a cutting insert and a blade holder. The cutting blade has a first blade bore having a first bore peripheral surface and an entry gap recessed therein. On assembling the cutting tool, a fastening element clamps the first bore peripheral surface and seals the first blade bore, releasably securing the cutting blade to the blade holder and allowing a fluid connection between the blade holder and the cutting blade.
1. A cutting blade ( 20 ) having a blade width W and comprising:
opposite first and second blade side surfaces ( 22 , 24 );
a peripheral blade surface ( 30 ) connecting the first and second blade side surfaces ( 22 , 24 );
a first insert seat ( 50 ) located at an intersection of the first blade side surface ( 22 ), the second blade side surface ( 24 ) and the peripheral blade surface ( 30 );
a first blade inlet ( 80 a );
a first blade outlet ( 82 a ) opening out towards the first insert seat ( 50 ) and in fluid connection with the first blade inlet ( 80 a ); and
a first blade bore ( 60 ) opening out to the first and second blade side surfaces ( 22 , 24 ), the first blade bore ( 60 ) having a first blade bore axis (B) defining an outward-radial direction (Ro) and an inward-radial direction (Ri) opposite to the outward-radial direction (Ro); the first blade bore ( 60 ) comprising:
a first bore edge ( 62 a ) formed at an intersection of the first blade side surface ( 22 ) and the first blade bore ( 60 );
a second bore edge ( 62 b ) formed at an intersection of the second blade side surface ( 24 ) and the first blade bore ( 60 ); and
a first bore peripheral surface ( 64 ) connecting the first and second bore edges ( 62 a , 62 b ), and comprising:
a first bore abutment sub-surface ( 66 a ) which conically tapers inwardly towards the first blade bore axis (B) from the first blade side surface ( 22 ); and
an entry recess ( 68 ) in fluid connection with the first blade inlet ( 80 a ), the entry recess ( 68 ) being spaced apart from the first bore edge ( 62 a ) and recessed further than the first bore abutment sub-surface ( 66 a ) from the first blade bore axis (B);
wherein:
the entry recess ( 68 ) circumferentially extends only part-way along the first bore peripheral surface ( 64 );
the first bore abutment sub-surface ( 66 a ) comprises a first entry abutment sub-surface ( 70 a ) defined between the entry recess ( 68 ) and the first bore edge ( 62 a ), the first entry abutment sub-surface ( 70 a ) also conically tapering inwardly towards the first blade bore axis (B) from the first blade side surface ( 22 ); and
in the outward-radial direction (Ro), a width of the first entry abutment sub-surface ( 70 a ) is smaller than a width of the first bore abutment sub-surface ( 66 a ) outside of the first entry abutment sub-surface ( 70 a ).
2. The cutting blade ( 20 ) according to claim 1 , wherein:
the blade width W fulfills the condition: 1.4 mm≤W≤3.6 mm.
3. The cutting blade ( 20 ) according to claim 1 , wherein:
an imaginary bisector plane (P) passes mid-way between the first and second blade side surfaces ( 22 , 24 );
the first bore abutment sub-surface ( 66 a ) is located between the imaginary bisector plane (P) and the first bore edge ( 62 a );
the first bore peripheral surface ( 64 ) further comprises a second bore abutment sub-surface ( 66 b ) located between the imaginary bisector plane (P) and the second bore edge ( 62 b ); and
the entry recess ( 68 ) opens out to the first and second bore abutment sub-surfaces ( 66 a , 66 b ).
4. The cutting blade ( 20 ) according to claim 3 , wherein:
the first bore abutment sub-surface ( 66 a ) conically tapers inwardly towards the first blade bore axis (B) from the first blade side surface ( 22 ) in a direction toward the imaginary bisector plane (P); and
the second bore abutment sub-surface ( 66 b ) conically tapers inwardly towards the first blade bore axis (B) from the second blade side surface ( 24 ) in the direction toward the imaginary bisector plane (P).
5. The cutting blade ( 20 ) according to claim 4 , wherein:
the first and second bore abutment sub-surfaces ( 66 a , 66 b ) conically taper relative to the first blade bore axis B at a cone angle α fulfilling the condition: 40°≤α≤140°.
6. The cutting blade ( 20 ) according to claim 5 , wherein:
the cone angle α fulfilling the condition: 50°≤α≤90°.
7. The cutting blade ( 20 ) according to claim 6 , wherein:
the cone angle α fulfilling the condition: 55°≤α≤70°.
8. The cutting blade ( 20 ) according to claim 3 , wherein:
the second bore abutment sub-surface ( 66 b ) comprises a second entry abutment sub-surface ( 70 b ) located between the entry recess ( 68 ) and the second bore edge ( 62 b ).
9. The cutting blade ( 20 ) according to claim 8 , wherein:
the second bore abutment sub-surface ( 66 b ) and the second entry abutment sub-surface ( 70 b ) conically taper inwardly towards the first blade bore axis (B) from the second blade side surface ( 24 ).
10. A cutting tool ( 1 ) comprising:
a blade holder ( 100 );
a cutting blade ( 20 ) according to claim 1 , releasably secured to the blade holder ( 100 ) in one of two possible configurations; and
a cutting insert ( 10 ) releasably secured to the cutting blade ( 20 );
the blade holder ( 100 ) comprises:
a holder fastening surface ( 120 ) being perpendicular to a holder fastening surface longitudinal plane (M) containing a holder fastening surface longitudinal axis (A);
a first holder bore ( 122 ) opening out to the holder fastening surface ( 120 ); and
a holder outlet ( 132 ) opening out to the holder fastening surface ( 120 ) and in fluid connection with a holder inlet ( 134 );
the fastener ( 150 ) comprises:
a fastener engagement portion ( 152 ); and
a fastener head ( 154 ) comprising a fastener abutment surface ( 156 ); wherein:
in a first of the two possible configurations, the second blade side surface ( 24 ) abuts the holder fastening surface ( 120 ), and the fastener ( 150 ) clamps the cutting blade ( 20 ) to the blade holder ( 100 ) via the first blade bore ( 60 ) and the first holder bore ( 122 ) and seals the first blade bore ( 60 ) at the first bore edge ( 62 a ); and
in a second of the two possible configurations, the first blade side surface ( 22 ) abuts the holder fastening surface ( 120 ), and the fastener ( 150 ) clamps the cutting blade ( 20 ) to the blade holder ( 100 ) via the first blade bore ( 60 ) and the first holder bore ( 122 ) and seals the first blade bore ( 60 ) at the second bore edge ( 62 b ).
11. The cutting tool ( 1 ) according to claim 10 , wherein:
the cutting tool is in the first of the two possible configurations; and
the fastener abutment surface ( 156 ) abuts against the first entry abutment sub-surface ( 70 a ).
12. The cutting tool ( 1 ) according to claim 10 , wherein:
the cutting tool is in the first of the two possible configurations; and
the fastener ( 150 ) is flush with, or recessed relative to, the first blade side surface ( 22 ).
13. The cutting tool ( 1 ) according to claim 10 , wherein:
the holder fastening surface ( 120 ) is mirror symmetric with respect to the imaginary holder fastening surface longitudinal plane (M).
14. The cutting tool ( 1 ) according to claim 10 , wherein:
the first holder bore ( 122 ) and the holder outlet ( 132 ) are spaced apart from each other and are in fluid connection via a holder groove ( 136 ) recessed on the holder fastening surface ( 120 ).
15. The cutting tool ( 1 ) according to claim 14 , wherein:
the holder outlet ( 132 ) is located closer to a center (C) of the holder fastening surface ( 120 ) than the first holder bore ( 122 ).
16. The cutting tool ( 1 ) according to claim 10 , wherein:
an imaginary bisector plane (P) passes mid-way between the first and second blade side surfaces ( 22 , 24 );
the first bore abutment sub-surface ( 66 a ) is located between the imaginary bisector plane (P) and the first bore edge ( 62 a );
the first bore peripheral surface ( 64 ) further comprises a second bore abutment sub-surface ( 66 b ) located between the imaginary bisector plane (P) and the second bore edge ( 62 b ), the second bore abutment sub-surface ( 66 b ) comprising a second entry abutment sub-surface ( 70 b ) located between the entry recess ( 68 ) and the second bore edge ( 62 a ); and
the entry recess ( 68 ) opens out to the first and second bore abutment sub-surfaces ( 66 a , 66 b ).
17. The cutting tool ( 1 ) according to claim 16 , wherein:
the fastener abutment surface ( 156 ) abuts against one of the first and second entry abutment sub-surfaces ( 70 a , 70 b ).
18. The cutting blade ( 20 ) according to claim 1 , wherein the first insert seat ( 50 ) is the only insert seat provided on the peripheral blade surface ( 30 ) and the cutting blade ( 20 ) only has a single insert seat.
19. The cutting blade ( 20 ) according to claim 1 , further comprising:
two blade clamping bores ( 72 ) opening out to the first and second blade side surfaces ( 22 , 24 ), each blade clamping bore ( 72 ) having respective bore peripheral surfaces ( 74 ) extending between the first and second blade side surfaces ( 22 , 24 );
wherein:
both of the two blade clamping bores ( 72 ) are closer to the first insert seat ( 50 ) than the first blade bore ( 60 ).