ULTRASONIC MACHINING

• US 3,699,719 A
• Filed: 01/25/1971
• Issued: 10/24/1972
• Est. Priority Date: 01/25/1971
• Status: Expired due to Term

• Current Assignee: Hans J. Wilkens, Nicholas Rozdilsky
• Original Assignee: Hans J. Wilkens, Nicholas Rozdilsky
• Inventors: Rozdilsky, Nicholas, Wilkens, Hans J.
• Primary Examiner(s): Kelly, Donald G.
• Application Number:
  US05/109,452
• Time in Patent Office: 638 Days
• Field of Search: 51/59SS,281,317,59R,292,328 408/17,700
• US Class Current: 451/60
• CPC Class Codes: B24B 1/04 subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency polishing or abrading surfaces on work by means of tumbling apparatus B24B31/00, involving oscillating or vibrating containers B24B31/06; superfinishing surfaces on work, e.g. by means of abrading blocks reciprocating with high frequency, B24B35/00
• CPC Class Codes: B24B 57/02 for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents

Abstract

The speed of ultrasonic abrasive slurry machining is improved by providing alternate periods during which the vibrating tool while urged against the workpiece is active and inactive.

Claims

1. A method of ultrasonic machining comprising:

positioning an ultrasonic tool adjacent a workpiece;

urging contact between said tool and workpiece;

supplying an abrasive slurry between the tool and workpiece to cause abrading machining of said workpiece by said tool, and periodically vibrating the tool at its resonant frequency for predetermined spaced intervals of time while said tool is urged into contact with the workpiece to provide successive periods in which the tool is rendered alternately active and inactive thereby to substantially increase the cutting speed of the tool.

2. The method claimed in claim 1 wherein the active periods of the tool are of equal time duration.

3. The method claimed in claim 2 wherein the inactive periods of the tool are also of equal time duration.

4. The method claimed in claim 1 wherein the active periods of the tool are of longer time duration than the inactive periods thereof.

5. The method claimed in claim 3 wherein the active periods of the tool are of longer time duration than the inactive periods thereof.

6. An ultrasonic machining apparatus comprising:

electro-acoustic means to receive electrical energy and provide vibrations in the ultrasonic frequency range;

a tool coupled to said electro-acoustic means to receive said vibrations;

means urging said tool into mechanical contact with a workpiece;

means for providing an abrasive slurry between said tool and workpiece for abrading machining of said workpiece by said tool, and control means coupled to said electro-acoustic means operable to periodically vibrate the tool at its resonant frequency for predetermined spaced intervals of time while said tool is urged into contact with the workpiece to provide successive periods in which the tool is rendered alternately active and inactive thereby to substantially increase the cutting speed of the tool.

7. Apparatus as claimed in claim 6 wherein the control means includes timing mechanism operable to provide active tool periods of equal time duration and inactive tool periods of equal time duration.

8. Apparatus as claimed in claim 7 wherein the timing mechanism is operable to selectively vary the time durations of the active and inactive periods of the tool respectively.