Forming method for hydraulic safety shaft

Abstract

The invention discloses a forming method for a hydraulic safety shaft and belongs to the technical field of aircraft part manufacture. The problems existing in current forming methods for hydraulic safety shafts is solved. The forming method comprises the steps that inner and outer frameworks are fixed to a lower mold of a mold; the outer framework is put in a cavity of the lower mold first, thenthe inner framework and the outer framework are aligned and put on the lower mold, at the moment, a locating block is inserted in splines of the inner framework and the outer framework, rotation of the inner framework is prevented, and then a first nut located at the bottom of the lower mold and a second nut located on the inner framework are matched with a thread shaft rod to fix the inner framework in a threaded mode; defoaming treatment is conducted on polyurethane rubber; the mold is preheated; polyurethane rubber and vulcanizer mixed liquid is poured; defoaming treatment is conducted on the mixed liquid; the mold is taken out and placed; mold assembly and vulcanization are conducted; when viscosity of the mixed liquid is increased to the non-wiredrawing state, mold assembly is conducted, and the die is put into vulcanization equipment to start vulcanization; and vulcanization is completed, the mold is removed, and the part is taken. The forming method is used for forming the hydraulic safety shaft between a helicopter hydraulic pump and a main speed reducer.

Description

technical field [0001] The invention belongs to the technical field of aircraft parts manufacturing, and in particular relates to a forming method of a hydraulic insurance shaft. Background technique [0002] The hydraulic insurance shaft used between the helicopter hydraulic pump and the main reducer plays the role of overload protection, and its quality directly affects flight safety, so it is of great significance to improve its quality; the hydraulic insurance shaft includes an outer skeleton and an inner skeleton, and the outer skeleton and Polyurethane rubber is poured between the inner skeletons to cure and molded, and a non-fitting spline structure is provided on the parts of the outer skeleton and the inner skeleton that are poured with polyurethane rubber to increase the contact surface with the polyurethane rubber and improve the curing effect; at present, the molding of the hydraulic insurance shaft The method is to place the exoskeleton on the lower mold of the ...

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