Tolerances and manufacturing process for wall thic

Tolerances and manufacturing process for wall thickness of carbon steel elbows and billets

Carbon steel elbow should be corrected under this hot condition.Because some elbow improper treatment, will be twisted, this is not allowed.In addition, after pushing the head, it is usually the front outside diameter is large, which should be corrected through the correction mold.Correction mold is actually a press, to have a set of molds, two semicircular arcs, up and down one.After the correction of the outside diameter to reach the size of the product requirements.The wall thickness is controlled by the wall thickness of the incoming material.All are 12.5%.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, such as elbow is 8.18 mm wall thickness, usually carry around 8.5 mm pipe, to guard against in pushing system error due to the local reduction of thickness.After finishing the shape, the outer diameter and wall thickness of the elbow have reached the requirements.The following finishing process, after shot peening treatment, remove the oxide iron sheet on the surface of the elbow, and hold the beveling treatment at both ends to facilitate the welding of carbon steel elbow.

The process of carbon steel elbow manufacturer is processed by pressure. According to the different bending temperature, the billet (billet, ingot, etc.) is processed into plastic deformation. The elbow manufacturer divides the elbow process into cold processing and hot processing two categories.

Forging method: the end or part of the elbow is punched and stretched by a die forging machine in a carbon steel elbow manufacturer to reduce the outside diameter.Commonly used die forging machines are rotary, connecting rod and roller.

Bulging method: one is to place rubber in the elbow manufacturer, the other is to form a hydraulic bulging type, the liquid is filled in the middle of the elbow, the liquid pressure is pressed into the elbow, the top of the elbow is screwed with a punch, so that the elbow manufacturer protruding forming;Make it form the desired shape, the consumption of corrugated elbow is more in this way.

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