Cutting brittle materials

Cutting – Processes

Patent

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83701, 225 1, B28D 122

Patent

active

051954109

ABSTRACT:
A method of cutting a brittle workpiece comprises applying to the surface of the workpiece a pointed tool, applying high frequency vibrations in a longitudinal direction to the tool, and moving the tool along a line to be cut of the workpiece while applying substantially steady longitudinally directed pressure to the tool. Stress is thereby applied to the workpiece as a combination of short impulses and steady direct stress and the breaking stress of the material would be attained coincident with the peak oscillatory stress. Crack propagation would therefore proceed by a series of stepwise fractures induced by successive cyclic stress peaks, resulting ultimately in the separation of the workpiece into two pieces. An apparatus for carrying out the method comprises a piezoelectric ceramic transducer to generate ultrasonic vibrations, a tip to be applied to the workpiece and having a hardness greater than that of the workpiece, with a tuned horn or the like being utilized to convey the ultrasonic vibrational energy to the tip.

REFERENCES:
patent: 2806328 (1957-09-01), Bradfield
patent: 3023547 (1962-03-01), Tesche
patent: 3909911 (1975-10-01), Smith et al.
patent: 3999453 (1976-12-01), Damast et al.
patent: 4343111 (1982-08-01), Inoue
patent: 4567797 (1986-02-01), Folk
patent: 4585152 (1986-04-01), Sager
"Macrosonics in Industries; Ultrasonic Machining" K. F. Graff, Ultrasonics, vol. 13, No. 3, May 1975.

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