Cutting tool holder

Patent metadata

Field	Value
Publication number	US-11344953-B2
Application number	US-201816631992-A
Country	US
Kind code	B2
Filing date	May 23, 2018
Priority date	Jul 27, 2017
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A cutting tool holder according to one embodiment supports a cutting insert including a rake face, a flank face, and a cutting edge. The cutting tool holder according to one embodiment includes: a holder body having a seat face on which the cutting insert is placed; a pressing member that positions and fixes the cutting insert to the holder body; and a fixing member that fixes the pressing member to the holder body. The pressing member has: a front end portion close to the cutting edge; and a base end portion distant away from the cutting edge. The front end portion is provided with a first coolant ejection hole. A first flow path is provided inside the holder body. A coolant reservoir and a second flow path are provided inside the pressing member.

First claim

The invention claimed is:

1. A cutting tool holder that supports a cutting insert including a rake face, a flank face continuous to the rake face, and a cutting edge constituted of a ridgeline that defines a boundary between the rake face and the flank face, the cutting tool holder comprising:
a holder body having a seat face on which the cutting insert is placed;
a pressing member that positions and fixes, to the holder body, the cutting insert placed on the seat face; and
a fastener that fixes the pressing member to the holder body,
wherein
the pressing member has a front end portion and a base end portion, the front end portion being closer to the cutting edge of the cutting insert placed on the seat face than the base end portion, the base end portion having a base end surface, a perimeter of the base end surface has an elliptical shape,
the front end portion is provided with a first coolant ejection hole via which coolant is ejected,
a first flow path through which the coolant flows is provided inside the holder body,
a coolant reservoir and a second flow path are provided inside the pressing member, the coolant reservoir is connected, via the non-circular coolant inlet hole, to the first flow path when the pressing member is fixed to the holder body, and the second flow path supplies, to the first coolant ejection hole, the coolant from the first flow path and the coolant reservoir, the coolant reservoir intersects the base end surface,
in respective cross sections orthogonal to a flow direction of the coolant, the coolant reservoir has a cross sectional area, the first flow path has a cross sectional area, and the second flow path has a cross sectional area, the cross sectional area of the coolant reservoir is larger than the cross sectional area of the first flow path, the cross sectional area of the coolant reservoir is larger than the cross sectional area of the second flow path,
an entirety of the coolant reservoir is disposed at a position closer to the base end surface than a center longitudinal axis of the fastener, in a direction from the front end portion toward the base end portion,
the flow direction of the coolant in the coolant reservoir is inclined relative to the center longitudinal axis of the fastener,
in a plan view of the pressing member, the entirety of the coolant reservoir and an entirety of the second flow path are on an opposite side of an imaginary straight line than the fastener, the imaginary straight line is parallel to the direction from the front end portion toward the base end portion, the imaginary straight line extends from the front end portion to the base end surface,
the pressing member has a through-hole through which the fastener passes,
in the plan view of the pressing member, the through-hole has an elliptical shape, and
in the plan view of the pressing member, a major axis of the through-hole is parallel to the direction from the front end portion toward the base end portion.

2. The cutting tool holder according to claim 1 , wherein
the pressing member is in contact with the holder body only at a portion located opposite to the fastener with respect to the imaginary straight line that is parallel to the direction from the front end portion toward the base end portion, the imaginary straight line is tangential to the fastener in the plan view of the pressing member.

3. The cutting tool holder according to claim 1 , wherein
the cross sectional area of the second flow path in respective cross sections orthogonal to the flow direction of the coolant becomes smaller from the coolant reservoir toward the first coolant ejection hole.

4. The cutting tool holder according to claim 1 , wherein a width of the first coolant ejection hole in a direction that is perpendicular to an ejection direction of the coolant is parallel to the rake face of the cutting insert placed on the seat face is larger than a width of the first coolant ejection hole in a direction perpendicular to the rake face of the cutting insert placed on the seat face.

5. The cutting tool holder according to claim 1 , wherein
the second flow path has a first end and a second end opposite to the first end, and
a first virtual extension line and a second virtual extension line cross each other at a position overlapping with the cutting edge of the cutting insert placed on the seat face when seen in a direction perpendicular to the rake face of the cutting insert placed on the seat face, the first virtual extension line being a virtual extension line obtained by extending a straight line representing the first end from the first coolant ejection hole when seen in the direction perpendicular to the rake face of the cutting insert placed on the seat face, the second virtual extension line being a virtual extension line obtained by extending a straight line representing the second end from the first coolant ejection hole when seen in the direction perpendicular to the rake face of the cutting insert placed on the seat face.

6. The cutting tool holder according to claim 1 , wherein
the second flow path has a first end and a second end opposite to the first end, and
a first virtual extension line and a second virtual extension line cross each other at a position displaced from the cutting edge when seen in a direction perpendicular to the rake face of the cutting insert placed on the seat face, the first virtual extension line being a virtual extension line obtained by extending a straight line representing the first end from the first coolant ejection hole when seen in the direction perpendicular to the rake face of the cutting insert placed on the seat face, the second virtual extension line being a virtual extension line obtained by extending a straight line representing the second end from the first coolant ejection hole when seen in the direction perpendicular to the rake face of the cutting insert placed on the seat face.

7. The cutting tool holder according to claim 1 , wherein
the holder body is provided with a second coolant ejection hole via which the coolant is ejected to the cutting edge of the cutting insert from the flank face side of the cutting insert placed on the seat face, and
a third flow path that supplies, to the second coolant ejection hole, the coolant flowing through the first flow path is provided inside the holder body.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Hirano Tsutomu
• Kukino Satoru
• Shimamoto Yosuke

Classifications

• B23B27/1677 Primary

  with plate-like cutting inserts clamped by a clamping member acting almost perpendicularly on the chip-forming plane and at the same time upon the wall of a hole in the insert · CPC title

• B23B27/1659 Primary

  with plate-like exchangeable cutting inserts (B23B27/1662 - B23B27/1681 take precedence) · CPC title

• B23B27/16

  with exchangeable cutting bits {or cutting inserts}, e.g. able to be clamped · CPC title

• B23B27/10 Primary

  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