according toMingyang technologyXiaobian understands that cold drawing isMake steel pipe or bar pass through tapered die holes of various shapes by pulling force, and change its cross section, so as to obtain the processing method of products with accurate size and smooth surface. Cold drawing is a cold extrusion processing method with a long history. In the tenth volume of "Heavenly Creations", the manufacturing process of sewing needles is comprehensively summarized and discussed,This shows that China has mastered the complete cold drawing production process as early as more than 300 years ago.
Cold drawing process is one of the cold extrusion processing methods of metals, and it is an important method that cannot be replaced by other processing techniques. This important position is determined by the characteristics and uses of the cold drawing process. The characteristics of the cold drawing process are that external force is applied to the front end of the drawn metal, and the metal blank is pulled out of the die hole smaller than the cross section of the metal blank, so that its length is increased, the cross section is reduced, and surface hardening is produced at the same time, which can improve the mechanical properties of the workpiece to a certain extent. Compared with the machining process, there is basically no material removal, and the material utilization rate is high.
Cold drawing steel is a multi-pass, multi-process and cyclic process. Due to the limitation of metal tensile strength, the reduction rate of cross-sectional area of cold-drawn steel per pass is generally less than30%If the special-shaped cross-section is cold drawn, the reduction rate of cross-sectional area will be smaller each time, so it needs to be drawn from raw material to finished product by multiple passes.
In addition to cold drawing, the production process of cold-drawn steel pipes or bars also includes auxiliary processes such as annealing, pickling, phosphorus saponification, tip rolling and straightening.
Automobile seat synchronizing rodIt is a typical process application of cold drawing process. Because different customers have different names, the synchronizing rod is also called dowel bar, connecting rod, star rod, etc., which is used for the angle adjustment mechanism of automobile seats, connecting the angle adjusters on both sides of the seats and driving motors (electric type) or handwheels (manual type) .
Mingyang Technology (Suzhou) Co., Ltd. is a large-scale automobile seat synchronous rod manufacturer in China, and its domestic market share has reached35%In addition, some projects are exported overseas.