Annealing device

Abstract

The invention discloses an annealing device. The annealing device comprises an annular sensor, wherein the annular sensor comprises an upper sensor and a lower sensor which is connected with the upper sensor. The annular sensor of the annealing device provided by the invention is divided into two layers, namely the upper sensor and the lower sensor, so that when the annealing device is powered on, two induced magnetic fields are generated. In the prior art, the magnetic field intensity, at the position R on the outer edge of the root of a threaded part, caused by a single magnetic field is weak; the two induced magnetic fields are distributed relatively uniformly on the threaded part and the position R on the outer edge of the root of the threaded part, namely the magnetic induction intensity at the position R of the outer edge of the root of the threaded part is enhanced, so that the position R of the outer edge of the root of the threaded part and the threaded part can reach an annealing temperature at the same time. Meanwhile, the annular sensor provided by the invention is divided into two layers, equivalently, a large magnetic field is divided into two small magnetic fields side by side; the distribution of the magnetic induction lines of the small magnetic fields are converged compared with that of the large magnetic field; and therefore, the heat affected zone of a higher stage neck journal caused by the annealing device is low.

Description

technical field [0001] The invention relates to the technical field of annealing, in particular to a crank partial annealing device. Background technique [0002] Annealing is a metal heat treatment process, which refers to slowly heating the metal to a certain temperature, keeping it for a sufficient time, and then cooling it at an appropriate speed. The purpose is to reduce hardness, eliminate residual stress, stabilize size, reduce deformation and crack tendency, refine grain, adjust structure and eliminate structure defects. [0003] Please refer to figure 1 , figure 1 Schematic diagram of the structure of the workpiece. [0004] like figure 1 As shown, there is a product series in the crankshaft connecting rod assembly products. The crank is designed for carburizing and quenching of low-carbon alloy steel, and the surface hardness is 58~62HRC. The threaded part 11 of this design needs to be annealed to reduce the hardness and prevent the threaded part. The teeth of...

AI Technical Summary

Problems solved by technology

When the tooth part of the threaded part 11 reaches the annealing temperature, the temperature at the outer edge R of the root is far lower than the annealing temperature, so that the annealing effect cannot be achieved, and the hardness cannot be lowered. If the method of increasing the induction power or prolonging the heating time makes When the temperature at the outer edge R of the root reaches the annealing temperature, the hardness at the outer edge R of the root can be reduced. However, in the process, the induction effect and heat conduction too much affect the upper journal 2, and the length of the heat-affected zone L reached 9mm, which in turn affected the comprehensive mechanical properties of the journal of this stage

Images