Air valve induction machining method

Abstract

The invention discloses an air valve induction machining method which is used for induction quenching of an air valve with a small-diameter lock clamping groove of a valve rod and a small end face of the valve rod, and the small end face of the valve rod and the lock clamping groove of the air valve are quenched at the same time. The situation that the quenching hardness and the hardening layer depth of the section (end) which is quenched firstly are affected by the heat conduction effect when the second section (end) is quenched in a two-time quenching machining scheme is avoided. The door type inductor of a special structure is designed, special air valve induction heating and quenching cooling parameters are designed, and compared with traditional induction quenching machining, it can be more reliably guaranteed that the depth of a hardening layer at the position of the lock clamping groove meets the drawing requirement, and the lock clamping groove is not thoroughly quenched.

Description

technical field [0001] The invention belongs to the technical field of induction processing, and in particular relates to an air valve induction processing method. Background technique [0002] For the air valve with lock clip groove, induction hardening is generally required for the small end face of the valve stem, and the lock clip groove does not require induction hardening. This kind of air valve induction hardening is not difficult. However, for valves with small diameter stems, both the lock clip groove and the small end face of the valve stem are required to be induction hardened, and the technical requirements of the two parts are inconsistent, so induction hardening of this kind of air valves is very difficult. Such as figure 1 As shown, the air valve requires both the small end face of the valve stem at the A end to be quenched, and the outer circle of the valve stem lock groove at the B section to be quenched, and the quenching hardness and the depth of the hard...

AI Technical Summary

Problems solved by technology

Of course, the heating power is not as high as possible. If the heating power is too large, the parts may be burned; the heating time is not as short as possible. If the heating time is too short, it may cause insufficient heating temperature, resulting in insufficient quenching hardness, and may also cause the depth of the hardened layer to be too shallow. ,vice versa

[0009] The effect of the distance between the quenching part and the induction head on induction hardening. Under the same process parameters, the smaller the distance between the quenching part and the induction head of the workpiece, the larger the eddy current generated on the surface of the workpiece, the more heat generated on the surface of the workpiece, the higher the heating temperature, and the higher the temperature. Easy to harden, the deeper the hardening depth, but the spacing is too small, due to the difference in length or diameter of the workpiece, or the difference in clamping, it is easy to cause the workpiece to contact with the induction and burn the workpiece

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