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Professional Analysis Of Heat Treatment Technology For Spring Steel Wire

Professional Analysis of Heat Treatment Technology for Spring Steel Wire
In order to improve the performance of Spring Steel Wire, now people come up with a variety of ways is to achieve a certain effect. In this paper, we discuss the different forming methods of spring wire heat treatment.
    Root molding method The manufacture of Spring Steel Wire can be divided into two types: cold forming and thermoforming (also known as strengthening after molding and strengthening after molding).
    1. Heat treatment of cold forming spring wire
    For small springs, such as wire diameter less than 8 mm below the coil spring or spring steel ribbon, etc., can be strengthened in the heat treatment or cold deformation after molding, that is cold-rolled with cold drawing forming. Cold drawn steel wire has a high strength, which is the use of cold-drawn deformation of steel to produce hardening and processing. Cold drawn spring wire according to its different technology can be divided into three different situations:
    (1) lead bath isothermal quenching cold drawn steel wire. That is, the first cold drawn to a certain size, in the heated to Ac3 +80 ~ 100 austenitizing, 450 ~ 550 lead bath in the isothermal quenching has been fine flaky pearlite organization and then repeatedly cold drawn to the required diameter. By adjusting the amount of steel carbon and cold drawn variable (type variable up to 85 ~ 90%), to the high strength and a certain plastic spring wire. This lead quenching wire treatment is actually a deformation heat treatment, that is, pearlite to change after the deformation, can make the wire strength of about 3000MPa.
    (2) cold drawn steel wire. This steel wire is mainly reinforced by cold drawing deformation, but with the lead quenching cold drawn wire is different, it is in the middle of the cold drawing process by adding a 680 degree intermediate spheroidizing annealing and improve the plastic, so that the wire can continue to cold The final size required is lower than the strength of the cold drawn steel wire. Spring wire wire 丨 Shandong Spring Steel Wire 丨 galvanized spring wire wire 丨 wire manufacturer 丨 Shanda Wire & Wire Products Co., Ltd.
    (3) quenching and tempering steel wire: This wire is cold drawn to the final size, and then quenched by tempering tempering to strengthen, and finally cold roll forming. The drawback of this enhancement is that the process is more complex and lower than the strength of the cold drawn steel wire.
    The three kinds of methods to strengthen the steel wire in the cold roll molding must be added after a low temperature tempering process, the tempering temperature of 250 to 300, tempering time of 1 hour. The purpose of low temperature tempering is to eliminate stress, stabilize the size, and increase the elastic limit. In practice, it has been found that the elastic limit of the steel wire which has been strengthened after cold rolling is not high, because the cold roll forming will be easy to increase the number of errors, and because of the effect of the plastic deformation caused by the package. So after cold roll molding must be a low-temperature tempering, has caused a multi-change process, improve the flexibility limit.
    2. Heat treatment of thermoformed springs
    Thermoforming spring is generally combined with quenching and thermoforming, that is, the heating temperature is slightly higher than the quenching temperature, heating and then hot roll molding, and then use the waste heat quenching, and finally 350 ~ 450 degrees in the tempering tempering, The body structure. This is a deformation heat treatment process, can effectively improve the elastic limit and fatigue life. General car on the large plate spring are used this method. For neutral coil springs can also be molded in the cold, and then quenching and tempering treatment.
    In order to give full play to the performance potential of the spring wire, the following three points should be noted in the heat treatment of the spring: spring spring wire filament 丨 spring wire wire 丨 galvanized spring wire wire 丨 wire supplier 丨 wire manufacturer
    (1) Spring Steel Wire mostly silicon manganese steel, silicon to promote the role of decarburization, manganese has the role of promoting grain growth. Surface decarburization and grain growth of the military just fatigue strength greatly reduced, so the heating temperature, heating time and heating medium should be careful to choose and control. Such as rapid heating with a salt furnace and heating in a protective atmosphere. After quenching should be tempered as soon as possible to prevent the occurrence of delayed fracture.
    (2) tempering temperature is generally 350 to 450 degrees. If the steel surface in good condition (such as grinding), should use low temperature tempering; the other can be used to limit the temperature tempering to improve the toughness of steel to reduce the sensitivity of surface defects.

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