When cold drawn steel tube under the action of force through a certain shape and size of the mould, plastic deformation occurs. In the production of drawing method can be roughly divided into three kinds: reducing tube drawing, subtract the outer wall tube drawing and reduction of wall tube drawing, cold drawing, steel pipe in the drawing force, the positive pressure
And under the action of friction, and corresponding deformation occurs, mostly through reducing, reducing wall and sizing three stages, and the corresponding stress is generated in the deformation zone of axial tensile stress, radial and circumferential stress, metal tube drawing process is always
And two to the compressive stress state, this is side impact door beams the basic mechanical characteristics of cold drawn pipe deformation process.

Cold drawn steel tube, cold rolled steel pipe unit is made of cold rolled, cold drawn or cold rolled and cold drawn pipe cold working methods of combining production of a complete set of gear combinations, is of deep processing of hot rolled steel tubes or welded pipe units.

On the basis of the processing properties of the metal, pipe size, quality, investment and benefit to choose different processing methods and the corresponding auxiliary process.
Basic process of cold rolling cold drawn pipe are
(1) tube material supply, the pipe material used for hot rolling pipe or semi-finished products, extruded tube, and welded tube;
(2) the tube material preparation, including inspection, baling, pickling, cleaning, washing, neutralization, drying and coating lubricant, etc.;
(3) cold (cold rolled or cold drawn);
(4) finished finishing including beam impact tubes finished heat treatment, leveling, sampling, cutting head
Tail, check (artificial check and various testing), oil water pressure test, painting, packing, warehousing, etc. The difference between different products finishing content.

Cold working pipe unit production is characterized by material from the input to the processed into finished products after many usually take cold deformation and strain hardening, and the whole production process is composed of multiple preparation process and the deformation process, and has the characteristics of reciprocating cycle, and process.

Much, long production period, the metal consumption is larger, the production efficiency is low, general production scale are unlikely.

At the same time in the unit configuration of cold impact beam tubes drawing and cold rolling mill is conducive to play their respective advantages, especially for production of high alloy steel pipe and stainless steel difficult to deformation of non-ferrous metal tube is more reasonable and necessary. Cold drawing machine with single and multiple roots pull straight pipe and drum.

A drawbench (see reel tube drawing). When single cold drawn pipe up to 50 m, the length of the roll tube drawing when hundreds of meters. Cold drawing machine tonnage minimum 30 kn, the maximum is 7000 kn. Conventional cold rolling mill with two-high cold rolling mill and roller mill can two kinds.