Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1998-05-11
2000-06-27
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
264255, 264265, 264266, 264319, 264320, 264219, 118504, 451 38, B32B 3112, B32B 3120
Patent
active
060803495
ABSTRACT:
A masking tool (60) for use in combination with a shaped-workpiece (30.sub.S) in the manufacture of a precision gear (10), which shaped workpiece (30.sub.S) defines a plurality of gear teeth (12) and tooth space surfaces (68) defined by and between adjacent gear teeth (12). The masking tool (60) is, furthermore, operative to mask the tooth space surfaces (68) during surface deposition of a masking material (28) while facilitating deposition of the masking material (28) upon the top lands (14) of the gear teeth (12). The masking tool includes a flexible back-plate (64) and a plurality of compliant masking segments (62) bonded to and integrated by the flexible back-plate (64). Each of the compliant masking segments (62) define a surface geometry (66) which is substantially complementary to the respective tooth space surface (68). Furthermore, adjacent compliant masking segments (62) define an open-ended channel (70) therebetween. In use, the masking tool (60) is forcibly urged in combination with the precision gear (10) such that the compliant masking segments (62) are disposed in superposed engagement with the tooth space surfaces (68) for prohibiting deposition of the masking material thereupon, and the open-ended channels (70) permit deposition of the masking material (28) on the top lands (14) of the gear teeth (12). The masking tool (60) is fabricated by: forming an accurate representation of the shaped workpiece (30.sub.S); preparing a surface of a flexible back-plate (64) so as to promote adhesion; situating the flexible back-plate (64) proximal to the gear teeth (12); and, forming a compliant material (62.sub.M) between the flexible back-plate (64) and the tooth space surfaces (68) so as to produce the compliant masking segments (62).
REFERENCES:
patent: 2363843 (1944-11-01), Duggan
patent: 3873376 (1975-03-01), Ritzka
patent: 5140781 (1992-08-01), Marsh et al.
patent: 5785771 (1998-07-01), Mitchell, Jr. et al.
Bittner Edward H.
Koscomb, III Walter S.
Mitchell, Jr. George D.
Collins Brian A.
Mason Suzanne E.
Sikorsky Aircraft Corporation
Silbaugh Jan H.
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