A process method for high-pressure filling and bulging of internal helical curved surface

Abstract

The invention relates to a pipe hydraulic forming technique, particularly to a technique for high-pressure mold-filling bulging in an internal spiral curved surface. A workpiece is positioned and clamped on a workbench, two ends of the workpiece is sealed by a sealing device, an electric heating device is started, the workpiece is filled with a high-pressure liquid, and the workpiece begins to bulge freely. Then the electric heating device is removed from the workbench after being turned on, an internal spiral curved surface mold is closed, and after a detection device detects that the workpiece is completely attached to the mold, the pressure is kept for a certain period according to geometric dimensions and the material of the workpiece. After completion, a hydraulic system is unloaded, the workbench is inclined to enable the liquid to flow back quickly, the sealing device is opened, and the workpiece is taken down. The devices adopted in the technique are simple in structure and low in cost, and molding of a pipe with the internal spiral curved surface is realized; efficient machining of internal spiral curved surfaces of spiral stator cases can be realized with the technique; the machining efficiency is multiple times that of an existing machining technology. The technique can be applied to production of other pipes with the internal spiral curved surfaces.

Description

technical field [0001] The invention relates to a process method of hydraulic forming of pipe material, in particular to a process method of high-pressure filling and bulging in an inner helical curved surface. Background technique [0002] Screw drilling motors and screw pumps are screw machines widely used in the petroleum industry. Their stator and rotor form a meshing pair with a tooth difference. Their design and manufacturing quality directly affect the performance indicators of the screw machine. The stator is composed of a metal shell and a rubber bush, and the helical surface of the rubber bush is meshed with the helical surface of the rotor. The traditional stator injects glue on the inner wall of the metal cylinder to form a rubber layer helical surface with unequal wall thickness; the new stator injects glue on the inner wall of the metal stator with pre-processed inner helical surface to form a rubber layer helical surface with equal wall thickness. The inner s...

AI Technical Summary

Problems solved by technology

The inner surface of the new stator metal shell needs to be processed into an inner helical curved surface. Due to the slender and complex inner surface of this type of part, its processing lacks efficient processing methods and manufacturing equipment

The existing processing equipment is complex, high cost and low efficiency

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