Different types of spring steel wire have different production methods, which require certain strength, high toughness and good coil spring property.
The process of using various spring wire is as follows:
Process flow of spring steel wire: (steel) wire rod - surface treatment - wire - wire (this method can be used for mattress wire)
Lead quenching spring wire: lead bath quenching in the middle specification of rod size or cold drawing and then surface treatment and drawing.
Galvanized steel spring wire: usually hot plate or electroplating in finished product size, and the cold drawn to the specified size when the hot plate acid is used.
Oil quenching spring wire: according to the need can use carbon steel or alloy steel, surface treatment and cold drawing to the finished size after quenching tempering treatment, the technology on automobile suspension spring and valve spring wire use morer, ordinary spring, of course, also can be used.
Surface treatment: it is usually phosphating, removing iron oxide and forming phosphating film.
A few are handled mechanically.
The aim is to meet the requirements of cold drawing process and obtain the smooth surface.
For high fatigue life of spring steel wire, such as valve spring steel wire, deal with wire rod skinned processing, reducing the surface defects, if the steel mill grinding on the billet, and also conducive to reducing defects.
Drawing: finished drawing process the drawing process of a great influence on the performance of the product, generally USES about 90% of the total larger ratio of surface area (see reduction rate) and the way of the smaller time degressive rate (about 10% to 20%), to ensure that the toughness of the products.
For high strength spring steel wire, drawing should control the export of steel wire for different temperature below 150 ℃, to prevent the occurrence of reverse wire for producing strain aging crack, this is the main defect of steel scrap.
For this reason, it is necessary to have good lubrication and adequate cooling, which can help reduce the temperature rise of steel wire.
Heat treatment: carbon steel spring wire lead bath quenching process, commonly used to obtain a very fine pearlite (sorbite), to improve the deep drawing performance and spring performance is beneficial, lead bath fluidized bed hasn't been promoting alternative process, applied only in small diameter.
The alloy steel wire is generally annealed heat treatment, so that the microstructure ADAPTS to the drawing deformation.
The heat treatment of stainless steel wire is treated with solid solution, and its purpose is to improve the tissue to meet the needs of drawing.
Oil quenching process used in the finished wire, using induction heating or gas, fuel heating furnace, heat the wire to the austenitizing temperature heat preservation for a period of time, again after quenching temperature tempering.
Although oil quenching is nominally known, water quenching or hardening of molecular materials is generally adopted
