Heat-push bending method for producing pipe fittings with equal diameters and equal wall thicknesses

Abstract

The invention relates to a heat-push bending method for producing pipe fittings with equal diameters and equal wall thicknesses, which comprises the following steps of: (1) cutting an elbow pipe fitting billet so as to enable two ends of the elbow pipe fitting billet to be of an inclined opening shape respectively, the length of a long segment of the elbow pipe fitting billet to be the length of an outer arc of an elbow pipe fitting product needed to be produced, and the length of a short segment of the elbow pipe fitting billet to be the length of an inner arc of an elbow pipe fitting product needed to be produced; (2) putting the cut elbow pipe fitting billet into a heating furnace, and heating the elbow pipe fitting billet to be 900-1000 DEG C; and (3) putting the heated elbow pipe fitting billet into a heat-push bending device for the pipe fittings with the equal diameters and the equal wall thicknesses, and carrying out pipe fitting pushing to obtain the finished pipe fittings with the equal diameters and the equal wall thicknesses. The invention has the advantages that: according to the method, the produced pipe fittings have equal wall thicknesses without being thinned, small dimensional deviation and attractive appearances.

Description

technical field [0001] The invention relates to a production method of pipe fittings of equal diameter and wall thickness, in particular to a production method of hot push-bending pipe fittings of equal diameter and wall thickness. Background technique [0002] At present, the forming methods of elbows mainly include push and stamping, and push is divided into cold extrusion and hot push. [0003] 1. The forming process of the cold extrusion elbow is to use a special elbow hydraulic forming machine, put the tube blank into the combination mold, and under the push of the push rod, the tube blank moves along the gap reserved between the inner mold and the outer mold. After the forming process is completed, the formed pipe is finally taken out by the demoulding device. [0004] Since each actuator of the elbow hydroforming machine is in the same frame, the size of the mechanism is small, and the thrust is also small, so the diameter of the elbow produced by it is relatively sm...

AI Technical Summary

Problems solved by technology

[0009] Compared with the hot push process, the appearance quality of stamping is not as good as the former, especially the two ends of the elbow are prone to sag deformation, and the inner core cannot be taken out; the outer arc of the stamping elbow is in a stretched state during forming, and there are no other parts redundant The metal is used for compensation, so the wall thickness reduction rate at the outer arc is also larger than the former

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