Advantages of Cold Drawing Steel
●Diversity of shapes and specifications
By designing molds of different shapes, cold-drawn steel with different cross-sectional shapes and different specifications and tolerances can be cold drawn. The angle can be designed as a right angle or a fillet.
High-quality carbide molds are used and professional mold maintenance engineers can ensure the
accurate and uniform tolerances.
The advanced cold drawing process can make the surface of cold drawn steel products smooth and bright.
The cold drawing process is to draw the raw materials to achieve the required shape, specifications and tolerances. The scrap of raw materials is very little. Compared with the materials scrapped by machining, the material saved by cold drawing process is considerable. Especially when the amount of steel consumption is large, the cost saving is quite significant.
●Processing time and processing equipment savings
Because of the high precision and good surface condition, cold drawn steel products can be used directly. You do not need to buy machines and cost and time of machining can be saved to make you more competitive.
The Cold Drawing Process for Steel Profile
●Raw Stock: Hot rolled steel bar or rod coils are used as raw material. Because the hot rolled products are produced at elevated temperatures (1700 - 2200 Deg. F. i.e. hot rolling), they generally have a rough and scaled surface and may also exhibit variations in section and size.
● Cleaning: Abrasive scale (iron oxide) on the surface of the hot rolled rough stock is removed.
●Coating: The surface of the bar or coil is coated with a drawing lubricant to aid cold drawing.
●Pointing: Several inches of the lead ends of the bar or coil are reduced in size by swagging or extruding so that it can pass freely through the drawing die. Note: This is done because the die opening is always smaller than the original bar or coil section size.
● Drawing: In this process, the material being drawn is at room temperature (i.e. Cold-Drawn). The pointed/reduced end of the bar or coil, which is smaller than the die opening, is passed through the die where it enters a gripping device of the drawing machine. The drawing machine pulls or draws the remaining unreduced section of the bar or coil through the die. The die reduces the cross section of the original bar or coil, shapes the profile of the product and increases the length of the original product.
●Finished Product: The drawn product, which is referred to as Cold Drawn or Cold Finished, exhibits a bright and/or polished finish, increased mechanical properties, improved machining characteristics and precise and uniform dimensional tolerances.
●Multi-Pass Drawing: The cold drawing of complex shapes/profiles may require that each bar/coil be drawn several times in order to produce the desired shape and tolerances. This process is called multi-pass drawing and involves drawing through smaller and smaller die openings. Material is generally annealed between each drawing pass to remove cold work and to increase ductility.
● Annealing: This is a thermal treatment generally used to soften the material being drawn, to modify the micro-structure, the mechanical properties and the machining characteristics of the steel and/or to remove internal stresses in the product. Depending on the desired characteristics of the finished product, annealing may be used before, during (between passes) or after the cold drawing operation, depending on material requirements.