Novel mining single ring tempering method

Abstract

The invention relates to the technical field of mine high strength circular chain heat treatment, in particular to a new mine high strength circular chain monocyclic tempering method. In the prior art, tempering after monocyclic quenching is mostly self-tempering by controlling monocyclic quenching cooling time, and the method is highly related to the experience of an operator, and not easy to be controlled; in foreign countries, a resistance heating method is also used for carrying out the monocyclic tempering and has non-ideal effect. The invention adopts a medium frequency induction heating method to cause a sing ring of a chain to obtain difference temperature tempering after the quenching, and leads a certain newly-accessed single ring in the chain, which is treated with the tempering and waits for the quenching, to be placed into a solenoid-typed medium frequency inductor; difference temperature tempering is obtained by the induction heating method, the performance of the single ring after the difference temperature tempering is kept to be consistent to that of other chain rings treated with heat treatment in the chain, to which the single ring belongs, and the chain rings adjacent to the single ring is not softened, thus improving the quality and the work reliability of the chain.

Description

Technical field: [0001] The invention relates to the technical field of heat treatment of high-strength round-link chains for mines, in particular to a new single-ring tempering method for high-strength round-link chains for mines. Background technique: [0002] At present, most of the chain manufacturers at home and abroad use medium frequency induction heating for continuous quenching and tempering for the heat treatment of high-strength round link chains. The heating inductor is a solenoid coil wound clockwise by a round copper tube or a square copper tube, and the chain passes through the middle of the coil during heat treatment. After the chain is heated and quenched by this method, a finer quenched structure can be obtained. Due to the low heating temperature and short time during tempering, different parts of the chain have different positions in the magnetic field of the sensor. According to the induction heating mechanism, different parts of the chain ring The obta...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, most of the tempering after single-ring quenching is self-tempering by controlling the cooling time of single-ring quenching. This method has a lot to do with the experience of the operator, it is not easy to control, and it is impossible to obtain differential temperature tempering. Effect

There is also a method of resistance heating for single-ring tempering in foreign countries, but the effect is not ideal.

For example, the part where the single ring is in contact with the electrode, because the contact is not easy to achieve an ideal state, the single ring is easily burned by the current when the power is turned on

At the same time, since the actual contact area between the two electrodes and the single ring cannot be exactly the same, the difference in current and resistance between the two electrodes and the single ring will cause the temperature distribution of the single ring to differ greatly from that of the link when the chain is tempered. , inconsistent performance

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