The Study Application Of Induction Heat Treating Technology For Thick Walled Pipe

With the development of world oil industry, the increasingly complex and harsh environment wells, oil drilling is facing increasingly harsh environment, the growing complexity of the forces drill, to meet the product use conditions, drilling for oil products, especially large diameter drill machinedemanding higher performance.To improve the performance of drill pipe, common practice is to use 50HZ frequency induction heating treatment.However, for wall thickness greater than 68mm above the large diameter drill can not penetrate into the wall, so that the direction of the tube cross-section along the diameter of the larger difference in performance, the product exists and defect after heat treatment and high residual stress, it is difficult to reach users of productsthe new requirements.And the production of the original induction heating equipment found in the natural power factor is low, the total electric efficiency is low.The main subject of heat treatment on the drill machine to design each of the major system reform.This paper introduces the sensor status and development trend of heat treatment, and the principle of induction heat treatment and machine tool structure was introduced..This design mainly used in the past 50HZ frequency induction heating insufficient basis to find them to be modified, combined with some process design task was to re-design, design a set of frequency can be adjusted between 38～80HZ variable frequency induction heating equipmentthrough the current frequency changes, the best match with the wall thickness to improve the power factor of induction heating equipment and electric natural overall efficiency; improve the product heat treatment organizations, reduce the heat stress and thus improve the mechanical properties.By comparing test analysis, the optimum process parameters, and achieved good resultssubmited some references for the policymakers.through adoption these measures.