What is a cold drawing?

Cold drawing is a process of metal formation, while a piece of metal is forced once or a number of countries, thus reducing the size of the cross -section of the original part. The cold drawing process provides a dimensionally consistent final product and at the same time improves both yield and tensile strength. The resulting surface is clean and without a scale or other defects. Cold drawing is usually used to produce accurate steel, copper and aluminum rods, rods and wires that must meet tight physical and mechanical specifications.

During the cold drawing process with a stationary platform called the drawing bench uses to hold the matrix on site. The bench has a feed and out-Feed side. The Out-Feed side consists of a long blind platform that is used to capture the finished stock after being forced through the matrix. The metal stock, usually in the form of a rod or wire, is loaded on the side of the feed. One end of the metal material is reduced by size, so it fits through the matrix. Hydraulic roller Nebliviják is then used to stretchmetal through the matrix and on out-Feed war.

There are three primary types of cold drawing: tube drawing, rod drawing and wire drawing. Drawing the tube reduces both the inner diameter (ID) and the outer diameter (from), increasing the length of the tube. The thickness of the hose wall remains constant. Drawing the rod reduces the cross -section of the original molding material and at the same time increases the length. The width or height of the original material can remain constant, although both dimensions are usually reduced. Drawing of the wire reduces the wire supply and increases the length. The volume of the wire remains constant. Wire drawing usually requires several phases to reduce the wire to the desired size. With signs used in wire drawing are usually made of tungsten carbide or diamond.

In addition to changing physical dimensions, colds also change certain mechanical properties of the original stock. Increase by 30% in tensile strength is possible and in many matheRials are often observed by 80% profits in yield strength. Changes in mechanical properties are related to the amount of decrease in the cross -section of the original warehouse. A small initial decrease in cross -section can lead to major changes in mechanical properties, although the rate of change decreases rapidly with increasing amounts of reduction.

Cold drawing is used in the production of copper electrical cables and the connection of households, as well as structural steels and industrial pipes. The cold drawing process produces many common everyday items such as paper clips, guitar strings and springs. Other applications include parts for various musical instruments and electric components, as well as hydraulic tubing and pipes.