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How to Reduce Melting Loss and Induction Quenching Defects

by:Kehua     2022-08-01
The power frequency has a small surface area of u200bu200bthe iron-core induction furnace, and the smelting loss when melting copper is about 0.4%-0.6%. When the reverberatory furnace is smelting, not only the oxidizing atmosphere will increase the smelting loss, but also the surface area of u200bu200bthe molten pool is large, and the smelting loss can reach 0.7%-0.9%, therefore, high-frequency heating machines are widely used in smelting copper, bismuth and their alloys. Reasonable raw material processing, including crushing processing of bulk raw materials, as well as drying, packaging or pelletizing, to ensure charging charging and melting sequence, including maintaining the necessary melt volume in the heating machine. Reasonable operation of high-frequency heating machine program. Alloy elements that are easy to oxidize and volatilize should be added at the end as an intermediate alloy or melted under the cover, and the charge needs to be reasonably distributed during charging, high temperature rapid melting, shorten the melting time, low temperature zinc is used for smelting brass, and continuous melting should be used as much as possible, The smelted alloy varieties are not easy to replace. (1) The hardness is not satisfactory. The reason is that the carbon content of steel is low, if the cooling operation is not suitable, there is a pre-cooling time before the surface layer is rapidly cooled, and the pearlite structure is obtained, if the cooling amount is insufficient or the water pressure is too low, the cooling rate is low, and the heating temperature ( The temperature of austenite induction heating equipment is low, and the carbon concentration in austenite is not uniform. For such defects, metallographic inspection, chemical composition analysis and appropriate heat treatment engineering control can be used. (2) Quenching cracks. 1. Overheating , Due to the design of sharp corners, keyways, round holes and edges, etc., when induction heating, it is easy to cause local overheating and cracking, improve the design or take protective measures to avoid the existence of dangerous parts. 2. After quenching, do not carry out Parts with unacceptable hardness are reheated and quenched under the premise of annealing or normalizing. Gold melting furnace 3. For high carbon steel and alloy steel parts, use a faster cooling rate, which can be adjusted by changing the cooling medium and water spray 4. Steel has high carbon content or large inclusions, which may cause surface cracking. 5. In the case of heat treatment or grinding, the grinding amount is too large and it is too cold when cooling. (3) Shape distortion. The original structure is not uniform (normalized or isothermal annealing), the heating is not uniform, and the cooling is not uniform. The general measures are: eliminate internal stress, increase the speed of parts, and continuously quench and heat to make the relative distance between the parts and the sensor. It is equal. Guangzhou Youzao is a non-standard customized high-frequency induction heating machine manufacturer that produces high-frequency heating machines, high-frequency quenching equipment, high-frequency brazing machines, and intermediate-frequency melting furnaces. Want to know more about high-frequency heating machine, high-frequency quenching equipment, high-frequency brazing machine, intermediate frequency melting furnace details, please contact us.
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