In Often, the difference of material or wall thickness of the bend selection difference and forming process.Factory now commonly used seamless bend forming process have hot, stamping, extrusion, etc.Divided into hot forming elbow machine and cold forming elbow machine.
Now we important acceptance of cold extrusion of elbow forming methods.Cold extrusion of elbow forming process is the use of dedicated elbow forming machine, pipe to be included in the external formwork, upper and lower mould clamping, under the impetus of the push rod, pipe bloom along the internal model and die reserved clearance activities and complete the course.By cold extrusion principle of elbow push system is very simple, cold extrusion of pipe forming process is the use of dedicated elbow forming machine, pipe to be included in the external formwork, upper and lower mould clamping, under the impetus of the push rod, pipe bloom along the internal model and die reserved clearance activities and complete the course.It's head or by a horn core mandrel into the mold, the fitting into the mold, the mold should have two and a half arc, the upper one, is a distractor in pushing down the mandrel bending process.Back support, under the section through the mandrel, behind a arched frame the mandrel is firm.Center has a hydraulic push rod device, through the hydraulic drive needle push forward.Pushing along the pipe mold semicircle groove going forward along the mandrel, until the needle to reach the end position, limit switch lock, died and then push the pipe, a processing up.After the plastic outer diameter to reach the size of the products.Wall thickness on the incoming material of wall thickness control.During the course of driving system, normal circumstances wall thickness should not be change, but if only because what reason, some places will produce wall signs, with the same lifting, usually wall thickness to add some allowance, to guard against in pushing system error due to the local reduction of thickness.Bend the outer diameter and wall thickness size have reached the requirements.Held "the finishing process, the course shot peening disposal of punishment, remove iron oxide on the surface of the inside and outside bend, the welding processing in order to hold both ends.To pass by a raid, type steel words, after spray paint and packaging, can put in storage, then the factory.
Inside and outside the die cold extrusion technology on manufacturing elbow shape symmetry of tasteful, wall thickness, the size of small faults, so deal with stainless steel elbow is particularly thin wall stainless steel elbow forming more acceptance of the manufacturing process.This new process used by internal and external mold precision demand is high;Wall thickness with requirements for tube bloom is better than force.
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