Hydrostatic nut and lead screw assembly, and method of...

Details Hydrostatic nut and lead screw assembly, and method of... Hydrostatic nut and lead screw assembly, and method of...

B - Operations, Transporting

24

B

B24B 19/12 (2006.01) B24B 47/20 (2006.01) B29C 70/68 (2006.01) B29C 70/78 (2006.01) B29D 1/00 (2006.01) F16H 25/24 (2006.01)

Patent

CA 2150247

A method of forming a hydrostatic nut (36) that cooperates with a lead screw (38) for translating a cam grinder wheel head (26). An externally lead screw master (66) is inserted into an internally threaded cylindrical mold (50). Beads of wax or tape (76, 78) are adhered to the external threads on the standard (66) while the rest of the standard (66) is treated with a release coating to define a continuous cavity (86, 88) between the internal threads of the nut (36) and the external threads on the standard (66). An epoxy resin is introduced into the cavity. The standard (66) is then removed and the wax or tape (76, 78) is removed to leave oppositely directed helical channels (86, 88) in the polymer. The helical channels are pressurized with a thin fluid film that prevents metal to metal contact.

Un procédé permet de former un écrou hydrostatique (36) qui coopère avec une tige filetée (38) pour déplacer une tête de meule à came (26). Un gabarit (66) de tige filetée à filetage externe est inséré dans un moule cylindrique (50)a filetage interne. Des gouttes de cire ou un ruban adhésif (76, 78) adhèrent au filetage externe du modèle (66) tandis que le reste de ce modèle est traité avec un revêtement de démoulage pour définir une cavité continue (86, 88) entre le filetage interne de l'écrou (36) et le filetage externe du modèle (66). Une résine époxy est introduite dans cette cavité. On retire alors le modèle (66), ainsi que la cire ou le ruban adhésif (76, 78), pour laisser subsister des sillons hélicoïdaux (86, 88) sur des faces opposées du polymère, sillons qui sont pressurisés, avec une mince couche d'un fluide qui évite le contact métal-métal.

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