Low-rigidity workpiece machining assistance system

Patent metadata

Field	Value
Publication number	US-10486286-B2
Application number	US-201415108336-A
Country	US
Kind code	B2
Filing date	Dec 26, 2014
Priority date	Dec 26, 2013
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A machining assistance system for assisting a machining apparatus includes: a workpiece supporting force generating unit, which generates workpiece supporting force against machining reaction force that is exerted on a machining portion of a workpiece by a working tool; a supporting device, which moves the supporting force generating unit while supporting the supporting force generating unit; and a workpiece supporting force control device, which controls operation of the workpiece supporting force generating unit and operation of the supporting device based on machining reaction force related data related to the machining reaction force and machining position related data related to a machining position of the working tool, such that the workpiece supporting force generating unit exerts the workpiece supporting force on the workpiece against the machining reaction force.

First claim

The invention claimed is:

1. A machining assistance system for assisting a machining apparatus, the machining apparatus including: a workpiece retaining tool that retains a workpiece; a machining unit that machines the workpiece retained by the workpiece retaining tool by driving a working tool; and a machining control device that performs control of moving the machining unit relative to the workpiece retaining tool to position the working tool at a machining position,
the machining assistance system comprising:
a workpiece supporting force generating unit that generates workpiece supporting force against machining reaction force that is exerted on a machining portion of the workpiece by the working tool;
a supporting device that moves the supporting force generating unit while supporting the supporting force generating unit; and
a workpiece supporting force control device that controls operation of the workpiece supporting force generating unit and operation of the supporting device based on machining reaction force related data related to the machining reaction force and machining position related data related to the machining position of the working tool, such that the workpiece supporting force generating unit exerts the workpiece supporting force on the workpiece against the machining reaction force, wherein:
the machining unit includes a rotating tool that is the working tool and a motor that drives the rotating tool, and the machining unit is configured to perform machining of the workpiece retained by the workpiece retaining tool by causing the rotating tool to rotate about a central axis of the rotating tool, the rotating tool being a columnar or discoid rotating tool with a cutting edge or grinding stone formed on its peripheral surface or distal end surface,
the workpiece supporting force generating unit includes a columnar rotary body and a rotation driver that causes the rotary body to rotate about a central axis of the rotary body, and
the workpiece supporting force control device is configured to, based on the machining reaction force related data and the machining position related data and by using the supporting device, perform:
control of an orientation and a position of the workpiece supporting force generating unit, such that the central axis of the rotary body is parallel to the central axis of the rotating tool, and the rotary body exerts pushing force on the workpiece against cutting reaction force that is exerted on the workpiece by the rotating tool; and
control of operation of the rotation driver to cause the rotary body to rotate, such that a rotational torque is exerted on the workpiece against a torque that is generated by the cutting reaction force.

2. The machining assistance system according to claim 1 , wherein
the machining unit is configured to perform cutting of a side surface of the workpiece retained by the workpiece retaining tool by causing a columnar rotating cutting tool with a cutting edge formed on its peripheral surface to rotate about a central axis of the rotating cutting tool, and
the workpiece supporting force control device is configured to, based on the machining reaction force related data and the machining position related data and by using the supporting device, perform:
control of the orientation and the position of the workpiece supporting force generating unit, such that
the central axis of the rotary body is parallel to the central axis of the rotating cutting tool,
a peripheral surface of the rotary body faces the peripheral surface of the rotating cutting tool with the workpiece positioned in between, and
the peripheral surface of the rotary body exerts pushing force on the workpiece against cutting reaction force that is exerted on the workpiece by the rotating cutting tool; and

control of operation of the rotation driver to cause the rotary body to rotate in the same direction as a rotation direction of the rotating cutting tool, such that a rotational torque is exerted on the workpiece against a torque that is generated by the cutting reaction force.

3. The machining assistance system according to claim 1 , wherein
the machining unit is configured to perform cutting of a surface of the workpiece retained by the workpiece retaining tool by causing a columnar rotating cutting tool with a cutting edge formed on its distal end surface to rotate about a central axis of the rotating cutting tool, and
the workpiece supporting force control device is configured to, based on the machining reaction force related data and the machining position related data and by using the supporting device, perform:
control of the orientation and the position of the workpiece supporting force generating unit, such that
the central axis of the rotary body is parallel to the central axis of the rotating cutting tool,
a distal end surface of the rotary body faces the distal end surface of the rotating cutting tool with the workpiece positioned in between, and
the distal end surface of the rotary body exerts pushing force on the workpiece against cutting reaction force that is exerted on the workpiece by the rotating cutting tool; and

control of operation of the rotation driver to cause the rotary body to rotate in a direction reverse to a rotation direction of the rotating cutting tool, such that a rotational torque is exerted on the workpiece against a torque that is generated by the cutting reaction force.

4. The machining assistance system according to claim 1 , wherein
the machining unit is configured to perform grinding of a side surface of the workpiece retained by the workpiece retaining tool by causing a discoid rotating grinding tool with grinding stone formed on its peripheral surface to rotate about a central axis of the rotating grinding tool, and
the workpiece supporting force control device is configured to, based on the machining reaction force related data and the machining position related data and by using the supporting device, perform:
control of the orientation and the position of the workpiece supporting force generating unit, such that the central axis of the rotary body is parallel to the central axis of the rotating grinding tool, and the rotary body exerts pushing force on the workpiece against grinding reaction force that is exerted on the workpiece by the rotating grinding tool; and
control of operation of the rotation driver to cause the rotary body to rotate, such that a rotational torque is exerted on the workpiece against a torque that is generated by the grinding reaction force.

5. The machining assistance system according to claim 1 , further comprising a dynamometer that detects motive power exerted on the workpiece, wherein
the machining reaction force related data is the motive power detected by the dynamometer.

6. The machining assistance system according to claim 1 , wherein
the machining assistance system further comprises a current sensor that detects an electric current flowing through the motor, and
the machining reaction force related data is a current value of the electric current flowing through the motor, the electric current being detected by the current sensor.

7. The machining assistance system according claim 1 , further comprising a vibration meter that is provided on the workpiece retaining tool and that measures vibration of the workpiece retained by the workpiece retaining tool, wherein
the machining reaction force related data is the vibration measured by the vibration meter.

8. The machining assistance system according claim 1 , further comprising a memory for storing the machining reaction force related data, wherein
the workpiece supporting force control device controls the operation of the workpiece supporting force generat

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Kitahata Takashi
• Kawahara Hideo

Classifications

• B24B41/06 Primary

  Work supports, e.g. adjustable steadies (B24B37/27 takes precedence) · CPC title

• G05B19/402

  characterised by control arrangements for positioning, e.g. centring a tool relative to a hole in the workpiece, additional detection means to correct position (G05B19/19 takes precedence) · CPC title

• B24B47/26

  Accessories, e.g. stops · CPC title

• G05B2219/49048

  Control of damping of vibration of machine base · CPC title

• G05B19/404

  characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence) · CPC title