Plate member of cutting tool, tool block, clamp member, and cutting tool

Patent metadata

Field	Value
Publication number	US-10052693-B2
Application number	US-201514915859-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Jan 14, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A plate member of a cutting tool has two side surfaces being substantially rectangular in shape, a top surface and a bottom surface extending in a direction along a long side of the rectangle, and two end surfaces in a short-side direction. A cutting edge is located on the side of one of the end surfaces. One of the side surfaces is a curved surface bulging outward. The bottom surface has an inclined portion which is inclined with respect to the top surface. The plate member is held by a tool block having a bottom restraining surface which comes into contact with the bottom surface, and is fastened to the tool block by using a clamp member having a top restraining surface which comes into contact with the top surface of the plate member.

First claim

The invention claimed is:

1. A cutting tool assembly, comprising:
a tool block comprising a bottom restraining surface; and
a plate member of a cutting tool seated in the tool block; wherein:
the plate member comprises:
first and second side surfaces being substantially rectangular in shape in a side view of plate member, each side surface having long and short sides;
a top surface and a bottom surface extending in a longitudinal direction along the long side, and
two end surfaces along a direction of the short side, wherein:
a cutting edge is located on the side of at least one end surface of the two end surfaces,
the first side surface is a convexly curved surface bulging outward between the top surface and the bottom surface, and
the bottom surface has an inclined portion which is inclined with respect to the top surface,

the bottom surface of the plate member is in contact with the bottom restraining surface of the tool block,
the tool block comprises a side restraining surface;
the first side surface of the plate member is in contact with the side restraining surface, and
the side restraining surface has at least two contact portions which come into contact with the first side surface.

2. The cutting tool assembly according to claim 1 , wherein:
the tool block further comprises an attachment reference surface; and
the bottom restraining surface is inclined with respect to the attachment reference surface.

3. The cutting tool assembly according to claim 2 , wherein:
on the attachment reference surface, a longitudinal direction is defined, and
as viewed from a front side perpendicular to the longitudinal direction, an inclination direction of the bottom restraining surface is a direction of gradually rising as a distance from the attachment reference surface increases in a direction parallel to the attachment reference surface.

4. The cutting tool assembly according to claim 3 , wherein:
as viewed from the front side, an angle of inclination (B) with respect to the attachment reference surface of the bottom restraining surface is in the range of 90° to 170°.

5. The cutting tool assembly according to claim 1 , wherein:
the tool block comprises a guiding surface; and
the guiding surface comes into contact with a clamp member.

6. The cutting tool assembly according to claim 5 , wherein:
the bottom restraining surface is inclined with respect to an attachment reference surface of the tool block;
on the attachment reference surface, a longitudinal direction is defined, and
as viewed from a front side perpendicular to the longitudinal direction, the guiding surface is inclined with respect to the attachment reference surface of the tool block, and
wherein an inclination direction of the guiding surface is identical to an inclination direction of the bottom restraining surface.

7. The cutting tool assembly according to claim 5 , wherein:
the tool block is a combined structure in which a plurality of members are combined, and
a member forming the guiding surface is different from a member forming the bottom restraining surface.

8. A cutting tool comprising:
a tool block comprising;
a side restraining surface comprising a first planar contact portion and a second planar contact portion, the first planar contact portion forming an obtuse angle with respect to the second planar portion;
a bottom restraining surface facing in a direction of the side restraining surface; and
an attachment reference surface for mounting the tool block onto a machine tool; wherein:
the first planar contact portion is located between the second planar contact portion and the bottom restraining surface, in a front view of the tool block; and

a plate member retained in the tool block, the plate member having a substantially rectangular shape in a side view thereof and comprising;
long top and bottom surfaces extending along a longitudinal direction of the plate member;
two short end surfaces extending in a direction transverse to the longitudinal direction and connecting the top and bottom surfaces;
a substantially rectangular first side surface which is convexly curved between the top and bottom surfaces;
a substantially rectangular second side surface which is concavely curved between the top and bottom surfaces, and the second side surface facing in a direction opposite to that of the first side surface;
a cutting edge located proximate an intersection of the top surface and one of the two short end surfaces; wherein:
the bottom surface has an inclined portion which is inclined with respect to the top surface; and

a clamp member comprising a top restraining surface;
wherein:
the tool block's bottom restraining surface is in abutment with plate member's bottom surface;
the tool block's first and second planar contact portions are in abutment with two vertically spaced apart portions of the convexly curved first side surface, in said front view of the tool block; and
the clamp member's top restraining surface is in abutment with the plate member's top surface, to thereby fasten the plate member to the tool block.

9. The cutting tool according to claim 8 , wherein:
a cross-sectional shape of the plate member is constant along a predetermined range of a length of the rectangular shape, such that the plate member is capable of being retained in the tool block over a corresponding range of projection lengths, along the longitudinal direction.

10. The cutting tool according to claim 8 , wherein:
the inclined portion of the plate member's bottom surface is inclined with respect to the plate member's top surface at an angle of inclination (A) of between 10° and 90°; and
the tool block's attachment reference surface forms an angle (B) of between 100° and 130° with the tool block's bottom restraining surface.

11. A tool block for a plate member of a cutting tool, the plate member seated in the tool block, the plate member comprising a bottom surface and a side surface, the tool block comprising:
a side restraining surface comprising a first planar contact portion and a second planar contact portion, the first planar contact portion forming an obtuse angle with respect to the second planar portion;
a bottom restraining surface facing in a direction of the side restraining surface; and
an attachment reference surface for mounting the tool block onto a machine tool; wherein:
the first planar contact portion is located between the second planar contact portion and the bottom restraining surface, in a front view of the tool block,
the bottom surface of the plate member is in contact with the bottom restraining surface of the tool block,
the side surface of the plate member is in contact with the side restraining surface, and
the first planar contact portion and the second planar contact portion of the side restraining surface come into contact with the side surface of the plate member.

12. The tool block according to claim 11 , wherein:
the tool block's attachment reference surface forms an angle (B) of between 90° and 170° with the tool block's bottom restraining surface.

Assignees

• Tungaloy Corp

Inventors

• Kurokawa Masahiro

Classifications

• B23B27/086 Primary

  with yieldable support for the cutting insert · CPC title

• B23B2220/12

  Grooving · CPC title

• B23B27/04 Primary

  Cutting-off tools (B23B27/08 takes precedence {; toolholders for cutting-off inserts B23B29/043}) · CPC title

• B23B29/043

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

• B23B29/06

  Tool holders equipped with longitudinally-arranged grooves for setting the cutting tool · CPC title