METHOD FOR MANUFACTURING ROTATION-SYMMETRIC ARTICLES BY CENTRIFUGAL CASTING

• US 3,691,263 A
• Filed: 01/19/1970
• Issued: 09/12/1972
• Est. Priority Date: 01/20/1969
• Status: Expired due to Term

• Current Assignee: Helena Prokopova, Karel Kliment, Miroslav Stol, Vladimir Stoy
• Original Assignee: Helena Prokopova, Karel Kliment, Miroslav Stol, Vladimir Stoy
• Inventors: Stoy, Vladimir, Stol, Miroslav, Prokopova, Helena, Kliment, Karel
• Primary Examiner(s): Arnold, Donald J.
• Assistant Examiner(s): Koeckert, A. H.
• Application Number:
  US05/003,908
• Time in Patent Office: 967 Days
• Field of Search: 264/1,8,298,311,236,237,348 65/71,302 164/81
• US Class Current: 264/2.1
• CPC Class Codes: B22D 13/04 of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
• CPC Class Codes: B29C 33/0038 with sealing means or the like seals on envelopes used in tyre retreading B29D30/542; for injection moulding footwear B29D35/0045
• CPC Class Codes: B29C 41/045 the axis being placed vertically, e.g. spin casting
• CPC Class Codes: B29D 11/00471 made by rotational casting B29D11/00115 takes precedence
• CPC Class Codes: B29L 2031/7602 Maps
• CPC Class Codes: C03B 19/04 by centrifuging C03B19/095 takes precedence

Abstract

The invention concerns centrifugal casting of articles which solidify either by a chemical reaction or by physical solidification, wherein a cast liquid is brought into contact only with at least one shaping liquid, or, if desired, also with a gas phase, at least one of the shaping liquids being specifically heavier and the other shaping liquid or liquids being specifically lighter than the cast liquid, all the liquids forming a sharp boundary with each other. Thus, any contact of the cast liquid with a solid phase such as with the wall of the rotating container is excluded and the cast article is shaped only by centrifugal force, gravity and surface tension.

Claims

2. Method as defined in claim 1, wherein at least one fluid phase in addition to the rotating liquid is rotated therewith to form the mold and said fluid phase is specifically lighter than the rotating liquid and the cast liquid, said rotating liquid, cast liquid and fluid phase constituting three substantially immiscible phases of properly graduated density.

3. Method as defined in claim 2, wherein the specifically lighter fluid phase is a gas.

4. Method as defined in claim 1, wherein there are present two specifically lighter fluid phases in addition to the rotating liquid and are rotated therewith to form the mold, said fluid phases being specifically lighter than the rotating liquid and the cast liquid, said fluid phases consisting of a liquid phase and a gas phase and forming with the rotating liquid and casting liquid four substantially immiscible phases or properly graduated density.

5. Method as defined in claim 4, wherein the most dense liquid forms the mold and wherein the second most dense liquid constitutes the casting liquid.

6. Method as defined in claim 1, wherein said cast liquid constitutes a monomer or mixture thereof capable of being polymerized during said rotation.

7. Method as defined in claim 1, wherein said rotation symmetric article formed is an optically homogeneous transparent body.

8. Method as defined in claim 7, wherein said article is an optical lens.