Carbon spring steel wire production methods
2019/7/26 view:
Different types of spring wire with different production methods require certain common characteristics are strength, hightoughness and good performance of a coil spring. Used a variety of spring steel wire fabrication methods are as follows: raw spring steel wire drawing process: (steel) rod - Surface treatment - Drawing (wire mattress can use this method)Surface treatment: general use of acid phosphate, remove oxide metal, forming phosphate coating; also have a fewmechanical approach. Drawing drawing process are intended to meet the requirements to obtain smooth surface. For applications requiring high fatigue life of spring steel wire, such as valve spring wire, wire rod for Flayer responseprocessing, reducing surface defects, if the steel in billets for grinding, but also beneficial to reduce defects. Drawing:finished pulling away drawing process a great impact on product performance, generally about 90% larger total reduction rate (see area reduction ratio) and smaller pass reduction rate (about 10% - 20%), in order to ensure the toughness. For high-strength spring steel wire, pull the wire each pass should control the outlet temperature is below 150 ℃, to prevent the wire due to the emergence of torsional strain aging produces cracks, which is causing a major flaw steel scrap.Therefore, when drawing must have good lubrication and sufficient cooling, the use of a smaller pass reduction rate andwire drawing speed helps to reduce the temperature rise.
Heat treatment: common carbon steel spring wire lead bath quenching process, get very fine pearlite (sorbite), for improving the performance of deep drawing performance, and springs are beneficial, alternative processes lead bath bedyet promotion, only a few small diameter applications. Annealed alloy steel wire commonly used to make drawingdeformation microstructure adapt. Stainless steel wire heat treatment using solution treatment, which also aims to improve the organization to adapt to the needs of the drawing. Oil quenching process used in the finished steel, usinginduction heating or gas, fuel oil furnace, the wire is heated to austenitizing temperature for a period of time, quenchingand tempering in the temperature once again. Although nominally called oil quenching, basically using water quenchingor quenching water plus polymer materials
Heat treatment: common carbon steel spring wire lead bath quenching process, get very fine pearlite (sorbite), for improving the performance of deep drawing performance, and springs are beneficial, alternative processes lead bath bedyet promotion, only a few small diameter applications. Annealed alloy steel wire commonly used to make drawingdeformation microstructure adapt. Stainless steel wire heat treatment using solution treatment, which also aims to improve the organization to adapt to the needs of the drawing. Oil quenching process used in the finished steel, usinginduction heating or gas, fuel oil furnace, the wire is heated to austenitizing temperature for a period of time, quenchingand tempering in the temperature once again. Although nominally called oil quenching, basically using water quenchingor quenching water plus polymer materials
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