Drawing process of precision seamless tube

Drawing process of precision seamless tube

Because the hole is smaller than the size of extubation die before pulling the outer diameter of the capillary system of the (extended unplug outside), so as to make the front end of the capillary can smoothly pass through the draft hole, so that the chuck jaws can pull the trolley system folder live capillary head before pulling the capillary system needs to be the head of queue-jumping (grind fine wool pipe ends to make it smaller than the outside diameter of the orifice size) To this end, the capillary should be heated at a certain length of slotted tube furnace end, generally 150 ~ 200mm, depending on the thickness of the heating temperature is between 750 ~ 900 ℃. Then with 75 to 300 kg of air hammer jump the queue, grind fuzz head tube, usually less than 22mm in diameter capillary available rotary hammer or roll forging machine grind tip.

Precision seamless tube defects and improve in order to remove the plastic before pulling system to go through heat treatment and pickling, pickling remove residual acid should be washed and dried. You can also use mechanical methods such as shot blasting, sandblasting and other alternative pickling to remove the oxide scale. In order to reduce the friction between the tool surface precision seamless and extubation time in order to reduce tool wear and prolong their life and reduce energy consumption, thus ensuring the quality of precision seamless tube, capillary before drawing lubricant to be applied.

Cold-drawn and cold rolling lubricant requirements are:

1 stable performance, can be firmly and evenly on the surface of the hair covering the pipe, the middle may not have broken or peeling;

2 lubricant film should have a high strength, peeling or deterioration does not occur in the deformation zone temperature, high pressure environment;

3 pipe coating can be removed more easily after pulling system;

4 does not produce toxic substances, does not pollute the surrounding environment;

5 cheap, abundant, reliable supply;