TOOL ASSEMBLY AND TOOL HOLDER THEREFOR HAVING AN ELASTIC MEMBER

• US 20110293382A1
• Filed: 05/25/2011
• Published: 12/01/2011
• Est. Priority Date: 05/26/2010
• Status: Active Grant

• Current Assignee: Iscar Limited (Berkshire Hathaway Incorporated)
• Original Assignee: Iscar Limited (Berkshire Hathaway Incorporated)
• Inventors: Chistyakov, Sergey
• Granted Patent: US 8,529,165 B2
• Time in Patent Office: Days
• US Class Current: 407/70
• CPC Class Codes: B23B 2200/048 Star form
• CPC Class Codes: B23B 2210/022 Grooving tools
• CPC Class Codes: B23B 27/04 Cutting-off tools B23B27/08 takes precedence ; toolholders for cutting-off inserts B23B29/043
• CPC Class Codes: B23B 29/24 Tool holders for a plurality of cutting tools, e.g. turrets indexing devices B23Q16/00
• CPC Class Codes: Y10T 407/2208 Plural simultaneously usable separable tools in common seat or common clamp actuator for plural simultaneously usable tools
• CPC Class Codes: Y10T 407/227 with separate means to fasten tool seat to holder
• CPC Class Codes: Y10T 407/2282 including tool holding clamp and clamp actuator

Abstract

A multi-grooving tool holder for holding cutting members seated in a side-by-side formation in a clamping portion of the holder. The clamping portion includes an upper clamp and a lower clamp and an elastic member is located in one of the upper and lower clamps. When cutting members are assembled in the clamping portion, the elastic member engages the cutting members and aligns each cutting member independently, by applying a force, and consequently a moment on the cutting members.

Claims

1. A tool holder (12, 112) comprising a clamping portion (16, 116) capable of holding a plurality of cutting members (14, 114) seated in a side-by-side formation therein, wherein the clamping portion (16, 116) comprises:

an upper clamp (20, 120);

a lower clamp (22, 122) having a lower clamp top surface (40, 140) which comprises a protrusion (52, 152) with a protrusion abutment surface (54, 154); and

an elastic member (58, 158) located in one of the upper and lower clamps (20, 120, 22, 122).

2. The tool holder (12, 112) according to claim 1, wherein the lower clamp (22, 122) has a sidewall (44) and the clamping portion (16) has a side clamp (24) for clamping the cutting members (14, 114) together against the sidewall (44).

3. The tool holder (12, 112) according to claim 1, wherein the protrusion abutment surface (54, 154) has a convex shape.

4. The tool holder (12, 112) according to claim 1, wherein the elastic member (58, 158) is oriented perpendicular to a longitudinal tool axis (A, A′

).

5. The tool holder (112) according to claim 1, wherein:

the elastic member (158) is located in a resilient upper clamp (120).

6. The tool holder (12) according to claim 1, wherein the elastic member (58) is located in the lower clamp (20).

7. The tool holder (12, 112) according to claim 1, wherein:

the elastic member (58, 158) is configured to bias each of the plurality of cutting members (14, 114) along a line of force (L1, L2) which passes through an abutment surface formed on the other of the upper and lower clamps (20, 120, 22, 122) in which the elastic member (14, 114) is not located, when the plurality of cutting members (14, 114) are seated in the clamping portion (16, 116).

8. The tool holder (12, 112) according to claim 7, wherein:

the line of force (L1, L2) passes through said each cutting member (14, 114) and a peripheral abutment surface thereof.

9. The tool holder (12, 112) according to claim 7, wherein:

the bias caused by the elastic member (58, 158) along the line of force (L1, L2) applies a moment (M1, M2) on each cutting member (14, 114), which moment (M1, M2) is in a direction of a moment created by a cutting force (F1, F2) acting on said each cutting member (14, 114).

10. The tool holder (112) according to claim 7, wherein:

each cutting member (114) comprises an insert holder (117) having a cutting insert (115) seated therein.

11. The tool holder (12, 112) according to claim 7, wherein:

the elastic member is made of a material that is different from the material of which the upper and lower clamps 20, 22 are made.

12. A tool assembly (10, 110) comprising a tool holder (12, 112) and a plurality of cutting members (14) seated in a side-by-side formation in a clamping portion (16) located at a forward end of the tool holder (12),

the clamping portion (16) comprising upper and lower clamps (20, 120, 22, 122);

an elastic member (58, 158) being located in one of the upper and lower clamps (20, 120, 22, 122); and

the lower clamp (22, 122) having a lower clamp top surface (40) comprising a protrusion (52, 152) with a protrusion abutment surface (54, 154);

the upper clamp (20, 120) comprising an upper clamp abutment surface (34, 134) facing towards the lower clamp (22, 122);

each cutting member (14, 114) comprising two side surfaces (78) and a peripheral surface (82) extending between the side surfaces (78), the peripheral surface (82) having cutting portions (76) and a peripheral abutment surface (84, 184) located between each pair of cutting portions (76);

wherein,

when the tool assembly (10, 110) is in an assembled position, on each cutting member (14, 114), one of the peripheral abutment surfaces (84′

, 184′

) abuts the elastic member (58, 158), a second peripheral abutment surface (84″

, 184″

) abuts the protrusion abutment surface (54, 154), and a third peripheral abutment surface (84″

, 184′

″

) abuts the upper clamp abutment surface (34, 134).

13. The tool assembly (10, 110) according to claim 12, wherein the lower clamp (22, 122) has a sidewall (44) and the clamping portion (16) has a side clamp (24) for clamping the cutting members (14, 114) together against the sidewall (44).

14. The tool assembly (10, 110) according to claim 12, wherein the protrusion abutment surface (54, 154) has a convex shape.

15. The tool assembly (10, 110) according to claim 12, wherein the elastic member (58, 158) is oriented perpendicular to a longitudinal tool axis (A).

16. The tool assembly (110) according to claim 12, wherein the elastic member (158) is located in a resilient upper clamp (120).