Apparatus and method for cutting inner surface of hole

Patent metadata

Field	Value
Publication number	US-10946456-B2
Application number	US-201916512792-A
Country	US
Kind code	B2
Filing date	Jul 16, 2019
Priority date	Apr 10, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A hole inner-surface cutting apparatus includes a working head composed of a rotatable body having a cutting tool and a main body, a rotation rod for rotating the rotatable body, and a stroke rod for stroking the working head. At least three positioning mechanisms for positioning the working head along a radial direction in the penetrating hole is provided on the main body. Each of the positioning mechanisms has three sliders arranged radially, guide rollers respectively disposed on distal ends of the sliders, a piston for pressing the sliders radially outward, and a fluid pressure chamber for actuating the piston. Further provided is a controller for controlling fluid pressures in the fluid pressure chambers of the positioning mechanisms independently from each other.

First claim

What is claimed is:

1. A hole inner-surface cutting apparatus for cutting an inner surface of a penetrating hole formed in a workpiece, the apparatus comprising:
a workpiece hold device that holds the workpiece;
a working head capable of being inserted into the penetrating hole, and including a head rotatable body that has a cutting tool for cutting the inner surface of the penetrating hole and is rotatable about a center axis thereof and a head main body that rotatably holds the head rotatable body;
a head rotation rod capable of being inserted into the penetrating hole from an end of the penetrating hole, and coupled with the head rotatable body to rotate the head rotatable body by being rotated by a rotation drive source; and
a head stroke rod capable of being inserted into the penetrating hole from another end of the penetrating hole, and coupled with the head main body to stroke the working head in an axial direction of the penetrating hole by being stroked by a stroke drive source, wherein
a cutting tool shift mechanism for shifting the cutting tool in a radial direction perpendicular to the axial direction is provided in the head rotatable body of the working head and the head rotation rod,
a plurality of positioning mechanisms for positioning the working head along the radial direction in the penetrating hole is provided at at least three positions along the axial direction in the head main body,
each of the positioning mechanisms has at least three sliders radially arranged evenly and slidable in the radial direction, guide rollers respectively disposed on distal ends of the sliders and contacting with the inner surface of the penetrating hole, a piston for pressing the sliders outward in the radial direction, and a fluid pressure chamber for actuating the piston, and
the hole inner-surface cutting apparatus further comprises a controller configured to control fluid pressures in the fluid pressure chambers of the positioning mechanisms independently from each other.

2. The hole inner-surface cutting apparatus according to claim 1 , further comprising:
a fluid pressure source for supplying fluid pressure to the fluid pressure chambers;
fluid pressure passages connecting the fluid pressure source with the fluid pressure chambers, respectively; and
valve mechanisms provided on the fluid pressure passages to adjust the fluid pressures to be supplied to the pressure chambers, respectively, by being controlled by the controller.

3. The hole inner-surface cutting apparatus according to claim 2 , wherein
the head stroke rod and the head main body include the fluid pressure passages, and
the head rotation rod and the head rotatable body include a supply passage for supplying cutting fluid to a vicinity of the cutting tool.

4. The hole inner-surface cutting apparatus according to claim 1 , wherein
the stroke drive source is controlled by the controller, and the controller detects a position of the working head in the axial direction in the penetrating hole based on control information of the stroke drive source.

5. The hole inner-surface cutting apparatus according to claim 1 , wherein
the cutting tool shift mechanism is controlled by the controller, and the controller detects a position of the cutting tool in the radial direction in the penetrating hole based on control information of the cutting tool shift mechanism.

Assignees

• Ihi Corp

Inventors

• Nishitani Akiyuki
• ENDA Michiko
• IREI Yoshiki
• Nakanishi Akira

Classifications

• B23B2260/116

  Rollers or rolls · CPC title

• B23B35/00 Primary

  Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23B2270/025

  Hydraulics · CPC title

• B23B47/00

  Constructional features of components specially designed for boring or drilling machines; Accessories therefor (working-spindles, bearing sleeves therefor B23Q1/70; for machine tools in general B23Q) · CPC title

• B23B29/03446

  by means of inclined planes · CPC title