Tool holder and machining method

Patent metadata

Field	Value
Publication number	US-12479033-B2
Application number	US-202017631164-A
Country	US
Kind code	B2
Filing date	Jul 22, 2020
Priority date	Jul 30, 2019
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A tool holder (100) comprising: an outside section (10) connected and fixed to a main shaft housing; a rotation input section (20) that is gripped by the main shaft and caused to rotate at a first rotation speed r1; a rotation output section (40) that has the rotational force from the rotation input section (20) transmitted thereto and rotates at a second rotation speed r2 that is different from the first rotation speed r1; a slider (60) that is moved in a first direction that intersects the rotational axis (Os) of the main shaft, as a result of the force from the rotation output section (40); a cutting edge (70) that is moved in the first direction by the slider (60) and is rotated by the rotation input section (20); and a detection mechanism (90) for detecting that the cutting edge (70) is at the origin position.

First claim

The invention claimed is:

1 . A tool holder for use in a machine tool which is provided with a spindle in which the tool holder is installed, and a rotation angle position of the spindle is controllable, the tool holder comprising:
an outside portion which is connected and affixed to a housing of the spindle, a first member having a shank which is gripped and rotated by the spindle at a first rotation speed, a second member rotatably supported inside the first member, wherein rotational power is transmitted from the first member, via a speed change mechanism, to the second member so that the second member rotates at a second rotation speed different from the first rotation speed, wherein the second member defines a threading, a conversion mechanism including a body part defining a first rack extending a predetermined length along a rotational axis of the spindle, and a threading which engages the threading of the second member, and a pivot part defining a first pinion which engages with the first rack and a second pinion, wherein the body part of the conversion mechanism is moved along the rotational axis of the spindle by the rotation of the second member through the engagement between the threading of the body part and the threading of the second member, and the pivot part is rotated by the movement of the body part of the conversion mechanism along the rotational axis of the spindle through the engagement between the first rack of the body part and the first pinion of the pivot part, a slider which is moved in a first direction intersecting the rotational axis of the spindle by power from the second member, wherein the slider defines a second rack which engages with the second pinion of the pivot part, the slider is moved in the first direction by the rotation of the pivot part through the engagement between the second pinion of the pivot part and the second rack of the slider, and a cutting edge which is moved in the first direction by the slider between an origin position and a maximum diameter position and which is rotated by the first member, wherein the second member comprises a clutch mechanism that is configured to prevent transmission of power from the second member to the conversion mechanism by intercepting rotation from the second member prior to transmission to the conversion mechanism, wherein the clutch mechanism comprises a driven component that defines the threading of the second member which engages with the threading of the body part of the conversion mechanism, and the transmission of power is intercepted as a result of rotational torque on the driven component exceeding a predetermined value.

2 . The tool holder according to claim 1 , further comprising;
a channel through which fluid is capable of passing, and the channel is configured so as to be closed when the cutting edge is in the origin position and so as to be open when the cutting edge is not in the origin position, or alternatively, is configured so as to be open when the cutting edge is in the origin position and so as to be closed when the cutting edge is not in the origin position.

3 . The tool holder according to claim 1 , wherein the clutch mechanism comprises:
a clutch component affixed to a body part of the second member, a plurality of balls rotatably embedded in the clutch component, a plurality of recesses capable of engaging with the balls provided in the driven component, and a disc spring for biasing the clutch component to the driven component.

Assignees

• Makino Milling Machine

Inventors

• Maeda Junichi
• Sugasaki Takaaki

Classifications

• B23B2270/48

  Measuring or detecting · CPC title

• B23B2270/027

  Pneumatics · CPC title

• B23Q17/22

  for indicating or measuring existing or desired position of tool or work {(B23Q16/005 takes precedence)} · CPC title

• B23Q3/12

  for securing to a spindle in general (B23Q3/152 takes precedence; chucks B23B31/02) · CPC title

• B23B49/00

  Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored (marking-out equipment B25H7/00; measuring devices, gauges G01B) · CPC title