Method for designing local tempering induction coil of ultrahigh-strength steel threaded type workpiece based on finite element simulation

Abstract

The invention provides a method for designing a local tempering induction coil of an ultrahigh-strength steel threaded type workpiece based on finite element simulation. A geometrical model is established according to shapes of an ultrahigh-strength steel optical axis workpiece and an induction coil; finite element simulation for induction heating is carried out after grid partition and material attribute loading; a result obtained by simulation is compared with an experimental measurement result; and, if the two are matched well, design of the induction coil of the ultrahigh-strength steel threaded type workpiece in the next step is carried out. The shape factor, the position factor and the number of turns of the induction coil are optimal in design; the designed induction coil can realize that a threaded part of the ultrahigh-strength steel threaded type workpiece has homogenized tempering temperature in an induction heating local tempearing process; finite elements are introduced into the design of the local tempering induction coil of the ultrahigh-strength steel threaded type workpiece; therefore, visualization of temperature distribution in the local tempering induction heating process of the threaded part can be realized easily; a design process is optimized; furthermore, the design mistakes can be reduced; and the design cost is reduced.

Description

technical field [0001] The invention relates to a design method for an induction coil for local tempering of an ultra-high-strength steel thread workpiece, and belongs to the technical field of induction heating. Background technique [0002] Due to its high strength and excellent comprehensive performance, ultra-high-strength steel is widely used in the aviation field, and most of it is used to manufacture the load-bearing structural parts of key or important parts of the aircraft. However, the notch sensitivity coefficient of ultra-high-strength steel is high. When using parts made of ultra-high-strength steel, adverse effects and performance degradation caused by notch stress concentration should be avoided and eliminated as much as possible. For threaded parts made of ultra-high-strength steel, local tempering treatment is usually used to reduce the stress concentration factor, thereby improving the fatigue strength and service life of the bolt. The traditional local te...

AI Technical Summary

Problems solved by technology

[0004] However, most of the current induction heating systems in my country have failed to get rid of the extensive design and operation status. The design of induction heating systems is mainly based on equivalent circuit models, empirical formulas and experimental correction methods. The calculation model is too simplified and can only be roughly estimated. Macroscopic electrical parameters; and before the induction heating system is officially put into production, a large amount of test and debugging work needs to be carried out according to the performance of the workpiece to finally determine the structural parameters and electrical parameters of the coil, which consumes a lot of manpower and material resources, and leads to failure of the induction heating power supply. Long design cycle and low efficiency

Images