Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1978-07-19
1980-01-22
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264 67, 264332, C04B 3556
Patent
active
041850610
ABSTRACT:
An improved method for producing a ceramic insulator is disclosed. The method comprises the steps of charging ceramic batch into a longitudinally extending die in which stepped arbors are supported by a plunger, forming a blank by pressing the batch between the arbor plunger and an opposing plunger, ejecting the blank and removing the arbors therefrom, contouring the blank to a desired shape, and firing the contoured blank. The insulator has a length-to-diameter ratio greater than 3:1 but not greater than 8:1; the improvement constitutes controlling the relative movements of the opposing plungers with respect to the longitudinal wall of the die during pressing of the blank so that at least 80 percent of the total plunger movement is in the direction of decreasing arbor diameter whereby variations in the end-to-end density of the insulator are minimized. Where 80 percent to 90 percent of the plunger movement is in the recited direction, a further improvement involves contouring the longitudinal surface of the blank to form generally a solid of revolution about the longitudinal axis of the blank wherein the diameter of the blank is greater than the desired fired diameter by a percentage which varies as an inverse function of the end-to-end density of the blank in order to achieve the desired longitudinal surface contour for the fired blank.
REFERENCES:
patent: 2027786 (1936-01-01), Ridgway et al.
patent: 3258514 (1966-06-01), Roach
patent: 3264380 (1966-08-01), Parsons
patent: 3599281 (1971-08-01), Boyer
patent: 3989438 (1976-11-01), Smith et al.
Arnold Donald J.
Champion Spark Plug Company
Purdue John C.
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