CUTTING DEVICE, MACHINING METHOD, AND DIE MACHINED BY THE MACHINING METHOD

• US 20090240367A1
• Filed: 03/12/2009
• Published: 09/24/2009
• Est. Priority Date: 03/19/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Takahashi, Masayuki, Tashiro, Isao
• Granted Patent: US 8,381,555 B2
• Time in Patent Office: Days
• US Class Current: 700/160
• CPC Class Codes: B23B 2260/108 Piezoelectric elements
• CPC Class Codes: B23B 29/125 Vibratory toolholders
• CPC Class Codes: B23Q 1/34 Relative movement obtained by use of deformable elements, e.g. piezoelectric, magnetostrictive, elastic or thermally-dilatable elements sensitive elements capable of producing movement or displacement for purposes not limited to measurement G12B1/00
• CPC Class Codes: B23Q 2230/004 Using a cutting tool reciprocating at high speeds, e.g. "fast tool"
• CPC Class Codes: Y10T 70/5549 Cover-carried lock

Abstract

A cutting device is provided which can simultaneously achieve a shorter machining time, lower machining resistance during cutting, and high-precision machining. To be specific, the cutting device of the present invention includes a three-axis tool unit including a first actuator operating in a u direction, a second actuator operating in a v direction orthogonal to the u direction, a third actuator operating in a w direction orthogonal to the u direction and the v direction, a tool holder disposed at the intersection of the u direction, the v direction, and the w direction, a tool mounted in the tool holder, and three sensors for measuring the displacements of the first, second, and third actuators, respectively and feeding back displacement signals representing the measured displacements, wherein the first, second, and third actuators of the three-axis tool unit vibrate so as to perform vibration cutting on a work material.

Claims

1. A cutting device comprising:

a three-axis tool unit comprising;

a first actuator operating in a u direction;

a second actuator operating in a v direction orthogonal to the u direction;

a third actuator operating in a w direction orthogonal to the u direction and the v direction;

a tool holder disposed at an intersection of the u direction, the v direction, and the w direction;

a tool mounted in the tool holder; and

three sensors for measuring displacements of the first, second, and third actuators, respectively and feeding back displacement signals representing the measured displacements; and

an arithmetic section for generating command values for the first, second, and third actuators, respectively,

the first, second, and third actuators performing operations independently controlled based on the command values generated by the arithmetic section and the displacement signals having been fed back from the three sensors,

wherein the first, second, and third actuators vibrate so as to perform vibration cutting on a work material.

2. The cutting device according to claim 1, further comprising:

three arbitrary waveform generators which are simultaneously controlled and generate waveforms for independently vibrating the first, second, and third actuators; and

three arbitrary waveform input devices which are disposed between the arithmetic section and the first, second, and third actuators and are fed with the waveforms generated by the three arbitrary waveform generators.

3. The cutting device according to claim 2, further comprising three amplifiers for driving the first, second, and third actuators, respectively,

wherein the three arbitrary waveform input devices are disposed before the three amplifiers.

4. The cutting device according to claim 2, further comprising three notch filters respectively disposed in feedback systems to which the displacement signals are fed back from the three sensors.

5. The cutting device according to claim 1, wherein the arithmetic section generates waveform values for independently vibrating the first, second, and third actuators and adding the generated waveform values to the command values.

6. The cutting device according to claim 1, wherein the arithmetic section generates the command values for the first, second, and third actuators so as to compensate for a displacement of a cutting edge of the tool from a predetermined position, the displacement being caused by deviations of movable axes of an ultraprecision machine including the three-axis tool unit.

7. A machining method of forming a blind groove on a work material by causing a tool to enter the work material and then retracting the tool from the work material, the method comprising the step of:

controlling, when the blind groove is formed, a cutting edge of the tool to a predetermined position so as to compensate for a displacement of the cutting edge of the tool from the predetermined position while vibrating the tool so as to perform vibration cutting on the work material, the displacement being caused by deviations of movable axes of an ultraprecision machine including a three-axis tool unit having the tool attached thereon.

8. The machining method according to claim 7, wherein the tool enters the work material at an angle smaller than 90°

and the tool retracts from the work material at an angle larger than 90°

.

9. A die having a blind groove formed by the machining method according to claim 7, wherein the blind groove has asperities formed on a surface of the blind groove by vibration cutting.