Views:243 Author:Site Editor Publish Time: 2019-10-25 Origin:Site
Cold drawn steel process is one of the oldest methods of pressure processing. In the tenth volume of "Tiangong Kaiwu", the production process of sewing needles was comprehensively summarized and discussed. This shows that China has mastered the complete cold drawing production process more than three hundred years ago.
In foreign countries, the production of cold drawn tubing appeared in the mid-19th century and it developed rapidly after the 1980s.
The cold drawn seamless tube manufacturing process can generally produce steel pipes with a diameter of 0.1-220 mm or more and a wall thickness of 0.01-6 mm or thicker. The cold drawn steel process can also be used to produce shaped pipes.
The cold drawn steel process is one of the metal pressure processing methods and an important method that cannot be replaced by other processing techniques. This important position is determined by the holding point and application of the cold drawing process. The cold drawing process is characterized by the external force acting on the front end of the drawn metal, and pulling the metal blank from the die hole smaller than the cross section of the metal blank, so that the length is increased and the section is reduced. It is commonly used to produce products with small cross-sections, such as thin metal wires, thin metal pipes, steel wires, etc. In addition, it can also be used to produce large-diameter profiles or pipes and no under 50 mm.
The processing method of pulling a steel billet through various shapes of tapered die holes and changing its cross section to obtain a dimensionally accurate, surface-cleaning article is called cold drawing.
Cold drawn steel includes specifications such as pipes, wires, rods and profiled sections. Rolled steel, extruded steel and forged steel are generally used as blanks. When producing a capillary tube, a cup blank which is stamped from a thin plate can also be used. The billets used to produce tubes and filaments are mostly round in shape, while the billets used to produce rods and profiles are round, square, rectangular or profiled. Drawing can also produce a variety of composite materials and a growing variety of heterogeneous pipes.
The cold drawn steel production process generally includes the main processes of tipping, heat treatment, pickling, lubricant application, drying, drawing, straightening, cutting, oiling and packaging. The drawing process varies depending on the specifications and materials of the extruding tube, wire, and rod.
Cold drawn steel is a multi-pass, multi-process and cycle process. Due to the limitation of the tensile strength of gold, the cross-sectional area reduction rate of cold drawn steel is generally less than 40%, so it is necessary to draw multiple times from raw materials to finished products.
Cold drawn steel equipment usually uses straight strips for pipe and bar steel, and a wide range of chain pullers are widely used.