Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1999-01-04
2000-12-05
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
264152, 264219, 2642791, 264299, B29C 3902
Patent
active
061562505
ABSTRACT:
Fully dense composite accurate tooling is manufactured by casting but without the requirement of subsequent machining. The tooling so provided by the invention comprises injection mold halves for mating engagement to form a mold for injecting multiple near net shapes using either thermoset or thermoplastic materials. A known vacuum casting technique used for producing parts has been modified to make tooling according to the invention. A master pattern of the near net shape or a model of the actual core and cavity of the desired mold is used to create a silicone rubber mold (SRM). Once the SRM is completed, the 3-part material (catalyst, resin and composite) is weighed to the required volume to cast into the SRM, then placed (along with the SRM) into the vacuum casting system which reaches a level of 28 inches Hg of vacuum. The 3-part composite material is thoroughly mixed for approximately 20 minutes in about 28 inches Hg of vacuum. Similarly, the composite mixture is automatically poured into the SRM at about 28 inches Hg of vacuum. By so mixing and pouring the three-part composite material in vacuum, the by-product of the catalytic reaction (CO.sub.2 or other gas that creates bubbles or voids) are virtually eliminated. After fully curing the three-part composite SRM, the end result of this unique process is a fully dense injection mold capable of holding tolerances of +/-0.002 inches while molding materials ranging from polyolefins to polyetherimides.
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Manual entitled: Application of Metal-Resin Compound to Mold--Quinnate Mez Series, by A. Ishikawa, President, Zeon Rize Co., Ltd. And T. Tsutui, Zeon Rize R&D Center, Zeon Rize Co., Ltd., No. 7 Kyobashi Nagaoya Bldg., 3-19-2, Hatchobori, Chuo-ku, Tokyo 104, Japan, received by applicants on/about Jan. 1, 1998.
Torres Michael J.
Wells Michael F.
Kuhns Allan R.
MCP Metalspecialties, Inc.
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