Control process for a monocrystal pulling machine

Details Control process for a monocrystal pulling machine Control process for a monocrystal pulling machine

1984-10-10

1987-04-21

Smith, Jerry

Boots, shoes, and leggings

364468, 422249, 156601, G05B 1100, B01J 1700

Patent

active

046601490

ABSTRACT:
The invention relates to a process for the control of a monocrystal pulling machine.
The process consists of recording in a computer memory parameters relating to the geometry of the monocrystal and the growth thereof, signals representative of the weight of the crystal and processed by processing circuits, then recording in said memory a programme so that the computer successively controls the raising to the appropriate temperature of the heating means for successively bringing about the melting of the product for forming the monocrystal, a fast automatic approach of the product bath by a pin carrying a nucleus up to a predetermined distance from the surface of said bath. Finally, the process consists of controlling a slower bath approach until the nucleus is in contact with the bath surface. Following this contact, the temperature of the heating means is automatically regulated for a zero growth of the crystal, the automatic pulling of the crystal and the cooling of the heating means at the end of pulling.
Application to the pulling of monocrystals.

REFERENCES:
patent: 3621213 (1971-11-01), Jen
patent: 3761692 (1973-09-01), Cope
patent: 4008387 (1977-02-01), Green et al.
patent: 4032386 (1977-06-01), Joyce
patent: 4176002 (1979-11-01), Quenisset
patent: 4207293 (1980-06-01), Scholl
patent: 4258003 (1981-03-01), Hurle
patent: 4539067 (1985-09-01), Washizuka
patent: 4565598 (1986-01-01), Seymor

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