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Quenching method and quenching machine tool for single ring of ring chain

A quenching machine tool, circular chain technology, applied in quenching device, furnace type, furnace and other directions, can solve the problems of out of tolerance, substandard products, waste of energy, etc., to save energy, ensure quality and work reliability, avoid Out-of-size effect

Active Publication Date: 2011-09-21
CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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Problems solved by technology

[0004] In the prior art, the single-ring quenching method is to carry out continuous quenching or box-type resistance furnace heating method to carry out continuous quenching by re-using the chain connected to the new ring as a whole, which is a waste of energy. The chain link after two times of quenching heat treatment will easily cause the size to be out of tolerance and become a substandard product

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  • Quenching method and quenching machine tool for single ring of ring chain
  • Quenching method and quenching machine tool for single ring of ring chain
  • Quenching method and quenching machine tool for single ring of ring chain

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Embodiment Construction

[0014] The 34×126 mine is quenched with a single ring joined by a high-strength C-grade circular link. The top of the chain link is clamped by the electrode, and the single ring is clamped by the single ring quenching machine tool, and then energized for preheating, the heating voltage is 160V, the current is 60A, heated to 400-450°C, the secondary heating voltage is 175V, and the current is 80A; The thermometer measures the temperature. When the single ring is heated to the quenching temperature of 900°C±10°C, there is no need for heat preservation, the power is turned off and the water is cooled, and the quenching is completed.

[0015] Spot check the hardness of the single ring after quenching: the hardness of the two points on the top of the single ring is HRC47, HRC48; the hardness of the three points on the shoulder is HRC47.5, HRC47, HRC47, which is basically the same as that of the adjacent links on the chain. After single-ring tempering, the static tensile sample is f...

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Abstract

The invention relates to the technical field of quenching of the single ring of a ring chain, and specifically relates to a quenching method and quenching machine tool for the single ring of the ring chain. In the prior art, a single ring is quenched through continuously quenching a chain to which a new ring is connected by intermediate-frequency induction reheating or quenching the chain to which the new ring is connected by tank-type resistance furnace heating, in such a manner, energy is wasted, and the chain rings of the original ring chain are subjected to quenching heat treatment twice,so that size over tolerance is easily resulted and an unqualified product is obtained. The quenching method provided by the invention comprises the following steps of: placing a new unquenched singlering connected to a chain in a single-ring quenching machine tool, clamping the top of the chain ring by an electrode, electrifying for heating after clamping tightly, controlling the quenching temperature of the single ring with an infrared thermodetector so as to guarantee that the heating temperature of the single ring reaches the required quenching temperature, loosening the single ring, stopping electrifying and cooling with water. The invention has the advantage that the hardness and metallurgical structure of the quenched single ring are absolutely identical to those of other quenched chain rings in the chain, thus guaranteeing the quality and working reliability of the chain.

Description

technical field [0001] The invention relates to the technical field of heat treatment of high-strength circular link chains for mines, in particular to a single-ring quenching method for circular link chains and a quenching machine tool. Background technique [0002] At present, chain manufacturers at home and abroad mostly use medium-frequency induction heating for continuous quenching for 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 in this way, a finer quenched structure can be obtained. The method of medium frequency induction heating for continuous quenching is continuous processing, high production efficiency, suitable for long chain production. Therefore, in the heat treatment of the circular chain, the method of medium frequency induction heatin...

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Application Information

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IPC IPC(8): C21D9/40C21D1/18C21D1/62
Inventor 武兴旺苗岩马瑞勇高爱民高国印王维喜
Owner CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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