Novel mining single ring tempering method

A high-strength, circular chain technology, used in heat treatment equipment, furnaces, heat treatment furnaces, etc., can solve the problems of far-flung temperature distribution, single-ring current burns, and lack of differential temperature tempering, so as to improve quality and The effect of job reliability

Active Publication Date: 2009-01-28
CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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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 el

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  • Novel mining single ring tempering method
  • Novel mining single ring tempering method

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[0014] During heat treatment, the single ring to be tempered in the chain is placed in the middle of the induction coil. If the inductance of the inductor is not enough during heating, an unloaded inductor can be connected in series. The heating temperature should be the same as that of the differential temperature tempering process for chains of the same specification.

[0015] Example of single-ring differential temperature tempering

[0016] The method of medium frequency induction heating is used to carry out differential temperature tempering on the 30×108 high-strength D-grade circular link for mining. The single-loop tempering sensor consists of a Φ20mm round copper tube that is tightly wound clockwise into a solenoid coil. The single-loop height of the 30×108 chain is 168mm, the maximum outer width is 98mm, and the effective number of turns of the inductor coil is 4 turns. , between turns and turns with 2mm thick mica sheet insulation. The inner diameter of the induc...

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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...

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Application Information

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IPC IPC(8): C21D1/18C21D9/40
Inventor 马瑞勇王维喜武兴旺张苏明高爱民吴永飞郭雨曹文智
Owner CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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