Light-weight tool holder with coolant cavity having varying cross-sectional area and cutting tool

Patent metadata

Field	Value
Publication number	US-11318541-B2
Application number	US-202016916622-A
Country	US
Kind code	B2
Filing date	Jun 30, 2020
Priority date	Jun 30, 2020
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A tool holder includes a coolant cavity opening out to a cavity inlet and outlet openings. The coolant cavity includes a cavity upper surface which extends along a cavity central axis. The cavity upper surface includes a cavity widening surface firstly which decreases in distance from the holder peripheral surface and secondly along which the cavity cross-sectional area increases, both with increasing distance from the cavity inlet opening. The cavity upper surface also includes a cavity narrowing surface, located further from the cavity inlet opening than the cavity widening surface, firstly which increases in distance from the holder peripheral surface and secondly along which the cavity cross-sectional area decreases, with increasing distance from the cavity inlet opening. A cutting tool is provided having a cutting insert releasably attached to the tool holder.

First claim

What is claimed is:

1. A light-weight tool holder ( 22 ), elongated along a holder longitudinal axis (B) thereof, the holder longitudinal axis (B) defining opposite forward and rearward directions (D F , D R ), the tool holder ( 22 ) being integrally formed to have unitary one-piece construction and comprising:
a holder forward end surface ( 28 ), a holder rearward end surface ( 30 ) and a holder peripheral surface ( 36 ) extending therebetween, the holder peripheral surface ( 36 ) extending about the holder longitudinal axis (B);
an insert pocket ( 44 a ), for releasably retaining a cutting insert ( 24 ), located at a forward end ( 32 ) of the tool holder ( 22 );
a shank portion ( 46 ) extending rearwardly from the insert pocket ( 44 a ); and
a coolant cavity ( 48 a ) having a cavity central axis (F), a cavity inlet opening ( 52 ), at least one cavity outlet opening ( 54 ) and a cavity weight-reducing portion ( 58 ) between the cavity inlet opening ( 52 ) and the at least one cavity outlet opening ( 54 ); wherein:
the cavity weight reducing portion ( 58 ) has a cavity cross-sectional area (CA) extending in a radial plane perpendicular to the holder longitudinal axis (B); and
the cavity weight reducing portion ( 58 ) comprises a cavity weight-reducing peripheral surface ( 60 ), extending about the cavity central axis (F), and comprising a cavity upper surface ( 62 ) extending along the cavity central axis (F), the cavity upper surface ( 62 ) comprising:
a cavity widening surface portion ( 70 ), which decreases in distance from the holder peripheral surface ( 36 ), and along which the cavity cross-sectional area (CA) increases, both with increasing distance from the cavity inlet opening ( 52 ); and
a cavity narrowing surface portion ( 72 ), located further from the cavity inlet opening ( 52 ) than the cavity widening surface portion ( 70 ), which increases in distance from the holder peripheral surface ( 36 ), and along which the cavity cross-sectional area (CA) decreases, both with increasing distance from the cavity inlet opening ( 52 ).

2. The tool holder ( 22 ), according to claim 1 , wherein the cavity widening surface portion ( 70 ) and the cavity narrowing surface portion ( 72 ) adjoin each other.

3. The tool holder ( 22 ), according to claim 1 , wherein the tool holder ( 22 ) is solid between the cavity narrowing surface portion ( 72 ) and the holder peripheral surface ( 36 ).

4. The tool holder ( 22 ), according to claim 1 , wherein:
the cavity upper surface ( 62 ) further comprises an auxiliary cavity widening surface portion ( 74 ), located further from the cavity inlet opening ( 52 ) than the cavity narrowing surface portion ( 72 );
the auxiliary cavity widening surface portion ( 74 ) decreases in distance from the holder peripheral surface ( 36 ), with increasing distance from the cavity inlet opening ( 52 ); and
the cavity cross-sectional area (CA) increases with increasing distance from the cavity inlet opening ( 52 ).

5. The tool holder ( 22 ), according to claim 4 , wherein the auxiliary cavity widening surface portion ( 74 ) and the cavity narrowing surface portion ( 72 ) adjoin each other.

6. The tool holder ( 22 ), according to claim 4 , wherein the auxiliary cavity widening surface portion ( 74 ) extends between rearward and forward auxiliary widened cavity planes (AWP R , AWP F ) which are oriented perpendicular to the holder longitudinal axis (B), the forward auxiliary widened cavity plane (AWP F ) being further from the cavity inlet opening ( 52 ) than the rearward auxiliary widened cavity plane (AWP R ).

7. The tool holder ( 22 ), according to claim 6 , wherein a portion of the auxiliary cavity widening surface portion ( 74 ) adjoining the rearward auxiliary widened cavity plane (AWP R ) is convexly curved or prismatically convex, when viewed in a longitudinal plane (LP) containing the cavity central axis (F) and intersecting the cavity upper surface ( 62 ).

8. The tool holder ( 22 ), according to claim 1 , wherein:
the cavity widening surface portion ( 70 ) extends between rearward and forward widened cavity planes (WP R , WP F ) which are oriented perpendicular to the holder longitudinal axis (B), the forward widened cavity plane (WP F ) being further from the cavity inlet opening ( 52 ) than the rearward widened cavity plane (WP R ); and
the cavity narrowing surface portion ( 72 ) extends between rearward and forward narrowed cavity planes (NP R , NP F ) which are oriented perpendicular to the holder longitudinal axis (B), the forward narrowed cavity plane (NP F ) being further from the cavity inlet opening ( 52 ) than the rearward narrowed cavity plane (NP R ).

9. The tool holder ( 22 ), according to claim 8 , wherein the cavity cross-sectional area (CA) at the forward widened cavity plane (WP F ) is greater than twice the cavity cross-sectional area (CA) at the forward narrowed cavity plane (NP F ).

10. The tool holder ( 22 ), according to claim 8 , wherein:
the rearward and forward widened cavity planes (WP R , WP F ) are spaced apart by a widening distance (DW);
the rearward and forward narrowed cavity planes (NP R , NP F ) are spaced apart by a narrowing distance (DN); and
the narrowing distance (DN) is greater than the widening distance (DW).

11. The tool holder ( 22 ), according to claim 8 , wherein, a portion of the cavity widening surface portion ( 70 ) adjacent the forward widened cavity plane (WP F ) is concavely curved, or prismatically concave, when viewed in a longitudinal plane (LP) containing the cavity central axis (F) and intersecting the cavity upper surface ( 62 ).

12. The tool holder ( 22 ), according to claim 8 , wherein, a portion of the cavity narrowing surface portion ( 72 ) adjacent the rearward narrowing cavity plane (NP R ) is concavely curved, or prismatically concave, when viewed in a longitudinal plane (LP) containing the cavity central axis (F) and intersecting the cavity upper surface ( 62 ).

13. The tool holder ( 22 ), according to claim 8 , wherein, a portion of the cavity narrowing surface portion ( 72 ) adjoining the forward narrowing cavity plane (NP F ) is convexly curved or prismatically convex, when viewed in a longitudinal plane (LP) containing the cavity central axis (F) and intersecting the cavity upper surface ( 62 ).

14. The tool holder ( 22 ), according to claim 1 , wherein:
the holder peripheral surface ( 36 ) comprises:
opposite holder top and bottom surfaces ( 38 , 40 ); and
two opposite holder side surfaces ( 42 ) connecting the holder top and bottom surfaces ( 38 , 40 ); and

the insert pocket ( 44 a ) is located at the intersection of the holder top surface ( 38 ) and the holder forward end surface ( 28 ).

15. The tool holder ( 22 ), according to claim 14 , wherein:
the tool holder ( 22 ) comprises a holder vertical axis (D) extending perpendicularly to the holder longitudinal axis (B) and intersecting the holder top and bottom surfaces ( 38 , 40 );
the tool holder ( 22 ) comprises a holder lateral axis (E) extending perpendicularly to the holder longitudinal axis (B) and intersecting the two holder side surfaces ( 42 ); and
the tool holder ( 22 ) is narrower along the holder lateral axis (E) than along the holder vertical axis (D), and also narrower along the holder vertical axis (D) than the holder longitudinal axis (B).

16. The tool holder ( 22 ), according to claim 14 , wherein:
the cavity weight-reducing peripheral surface ( 60 ) comprises:
a cavity lower surface ( 64 ) opposite the cavity upper surface ( 62 ), the cavity upper surface ( 62 ) being closer to the holder top sur

Assignees

• Iscar Ltd

Inventors

• Blabes Chen
• Moyal Hadas

Classifications

• B23B2210/022

  Grooving tools · CPC title

• B23B27/10

  Cutting tools with special provision for cooling {(drills with lubricating or cooling equipment B23B51/06; features relating to lubricating or cooling of milling cutters B23C5/28; arrangements or devices for cooling or lubricating tools or work B23Q11/10)} · CPC title

• B23B27/086

  with yieldable support for the cutting insert · CPC title

• B23B29/043 Primary

  with cutting-off, grooving or profile cutting tools, i.e. blade- or disc-like main cutting parts (B23B29/14 takes precedence) · CPC title

• B23B29/12 Primary

  Special arrangements on tool holders · CPC title