Replaceable cutting head

Patent metadata

Field	Value
Publication number	US-9925602-B2
Application number	US-201314064767-A
Country	US
Kind code	B2
Filing date	Oct 28, 2013
Priority date	Mar 29, 2013
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A replaceable cutting head stably rotates a head body using a work tool during attachment. An outer periphery of the head body is provided with a plurality of chip discharge grooves extending along a direction of an axis, cutting blades extending along the chip discharge grooves, and a pair of latching faces that are formed by cutting the outer periphery of the head body and are arranged back to back with the axis interposed therebetween at a base end portion along the axial direction. A first chip discharge groove, and a second chip discharge groove having a narrower width along a circumferential direction around the axis than the first chip discharge groove at at least the base end portion along the direction of the axis are included in the chip discharge grooves. At least one latching face is connected to a base end portion of the second chip discharge groove.

First claim

The invention claimed is:

1. A replaceable cutting head having a head body detachably attached to a tip of a tool body rotating around rotation axis, said head body comprising:
a cutting blade portion having an axis and a base end;
an attaching portion to be attached to the tip of the tool body;
a latching portion formed between the base end of the cutting blade portion and the attaching portion coaxially with the cutting blade portion and the attaching portion;
a plurality of chip discharge grooves which are formed on an outer periphery of the cutting blade portion so as to extend along the axis and are configured to discharge chips from the head body;
cutting blades that extend along the chip discharge grooves; and
a pair of latching faces that are formed by cutting the outer periphery of the latching portion in a planar shape and are arranged back to back with the axis interposed there between,
wherein the chip discharge grooves include at least one first chip discharge groove and at least one second chip discharge groove,
the second chip discharge groove has a narrower width along a circumferential direction around the axis than a width of the first chip discharge groove at the base end,
the first chip discharge groove and the second chip discharge groove are alternately disposed in the circumferential direction,
at least one latching face has a width in the circumferential direction that is approximately the same as the width of the second chip discharge groove, and the at least one latching face is directly connected to the second chip discharge groove such that a base end of the second chip discharge groove is aligned with the at least one latching face in an axial direction and clogging of the chips in the second chip discharge groove is prevented,
the latching portion has a diameter equal to or smaller than the diameter of the cutting blade portion, and
the base end of the second chip discharge groove is located between a pair of end edges of the at least one latching face, said end edges being located at both ends of the at least one latching face in the circumferential direction.

2. The replaceable cutting head according to claim 1 ,
wherein both end edges of the at least one latching face along the circumferential direction extend in a ridgeline at the outer periphery of the latching portion without being cut out by the second chip discharge grooves.

3. The replaceable cutting head according to claim 2 ,
wherein a pair of the second chip discharge grooves are formed at the outer periphery of the cutting blade portion, and
the pair of latching faces are respectively connected to the base ends of the second chip discharge grooves.

4. The replaceable cutting head according to claim 1 ,
wherein a pair of the second chip discharge grooves are formed at the outer periphery of the cutting blade portion, and
the pair of latching faces are respectively connected to the base ends of the second chip discharge grooves.

5. The replaceable cutting head according to claim 1 ,
wherein a groove width of the first chip discharge groove along the circumferential direction is equal to a groove width of the second discharge groove at a tip end portion of the cutting blade portion.

6. The replaceable cutting head according to claim 1 ,
wherein each of the first chip discharge groove and the second chip discharge groove comprises;
a main groove that forms a peripheral cutting blade and a rake face, and
a sub-groove that is adjacent to a front of the main groove in a tool rotation direction,

wherein the main groove and the sub-groove form a ridgeline therebetween, and the ridgeline has a convex V-shape cross-section which protrudes toward an outer side in the radial direction and extends so as to be twisted along each of chip discharge grooves.

7. The replaceable cutting head according to claim 1 ,
wherein a number of the first chip discharge grooves is two, and a number of the second chip discharge grooves is two.

8. The replaceable cutting head according to claim 1 ,
wherein a total number of the first chip discharge grooves and the second chip discharge grooves is three.

9. The replaceable cutting head according to claim 1 ,
wherein one end of the latching face connected to the second chip discharge groove is cut-out by a curved end of the second chip discharge groove such that the one end of the latching face has a concave curved shape toward an inside of the latching face.

10. The replaceable cutting head according to claim 1 , wherein at least one of the latching faces has a width in the circumferential direction that is the same as the width of the second chip discharge groove.

11. The replaceable cutting head according to claim 1 , wherein the pair of end edges extend parallel to the rotation axial and are connected to the cutting blades.

12. The replaceable cutting head according to claim 1 , wherein an outermost diameter of the latching portion is equal to or smaller than an outermost diameter of the cutting blade portion.

13. A replaceable cutting head having a head body for detachable connection to a tip of a tool body rotatable around a rotation axis, said head body comprising:
a cutting blade portion having an axis and a base end;
an attaching portion for attachment to the tip of the tool body;
a latching portion formed between the base end of the cutting blade portion and the attaching portion, said latching portion being coaxially aligned with the cutting blade portion and the attaching portion;
a plurality of pairs of chip discharge grooves which are formed on an outer periphery of the cutting blade portion so as to extend along the axis, said grooves being configured to discharge chips from the head body;
cutting blades that extend along the chip discharge grooves; and
a pair of latching faces that are formed by cutting the outer periphery of the latching portion in a planar shape, said latching faces being arranged back to back with the axis interposed there between,
wherein the pairs of chip discharge grooves include at least a first chip discharge groove and a second chip discharge groove,
in each pair the second chip discharge groove having a narrower width at the base end along a circumferential direction around the axis than a width of the first chip discharge groove at the base end,
the pairs of chip discharge grooves being arranged such that first chip discharge groove and second chip discharge groove are alternately disposed in the circumferential direction,
at least one latching face has a width in the circumferential direction that is the same as a maximum width of the second chip discharge groove, and the at least one latching face is directly connected at the maximum width of the second chip discharge groove such that an end of the second chip discharge groove at the base end of the cutting blade portion is aligned with the at least one latching face in the axial direction and clogging of the chips in the second chip discharge groove is prevented,
the latching portion has a diameter equal to or smaller than the diameter of the cutting blade portion, and
the base end of the second chip discharge groove is located between a pair of sides of the at least one latching face, the pair of sides being located at both ends of the at least one latching face in the circumferential direction.

Assignees

• Mitsubishi Materials Corp

Inventors

• Azegami Takayuki
• ABE Tarou

Classifications

• B23C2210/0492

  different · CPC title

• Y10T407/1946

  Face or end mill · CPC title

• B23C2210/282

  Unequal angles between the cutting edges, i.e. cutting edges unequally spaced in the circumferential direction · CPC title

• B23C2210/03

  Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank · CPC title

• Y10T408/892

  with work-engaging structure detachable from cutting edge · CPC title