Method of and apparatus for controlling the filling of a mold wi

Details Method of and apparatus for controlling the filling of a mold wi Method of and apparatus for controlling the filling of a mold wi

1988-11-22

1990-09-11

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

156DIG83, 264 407, 264114, 264311, 425141, 425174, 425435, 425147, B29C 3944, B29D 2400

Patent

active

049561340

ABSTRACT:
A method and apparatus for manufacturing one phase of a silica crucible including controlling the filling of a hollow mold of cylindrical shape, which rotates about its vertical axis, with grains of crystallized quartz. The grains of material are continuously introduced into the mold and are deposited on or near the lateral wall face of the mold in the form of a cylindrical layer, E, of internal radius R. A beam of light is directed to form a luminous spot on the summit of the layer from the commencement of its formation and the radial displacement of the spot on the layer is observed. The height at which the grains are introduced and the height of the trajectory of the luminous beam are modified as a function of the position of the luminous spot relative to determined reference points.

REFERENCES:
patent: 1936820 (1933-11-01), Benner et al.
patent: 3081485 (1963-03-01), Steigerwald
patent: 3409709 (1968-11-01), Cleereman et al.
patent: 3412431 (1968-11-01), Lemelson
patent: 3551947 (1971-06-01), Jennings
patent: 4528163 (1985-07-01), Albrecht
patent: 4629878 (1986-12-01), Blanc et al.
patent: 4632686 (1986-12-01), Brown et al.
patent: 4639140 (1987-01-01), Lerat
"Laser Beam Controls Crystal Growth", Solid State Technology, vol. 16, No. 8, Aug. 1973, p. 8.

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