Introduction to the selection of 5 types of quenching furnaces
A quenching furnace is a furnace that heats the workpiece before quenching. Quenching is to put the workpiece into the furnace to heat the quenching temperature above the critical point and maintain the same for a period of time, and then quickly take the workpiece out of the furnace and put it into the quenching liquid (oil or water) for quenching.
The heat source of the furnace can be measured by electricity and fuel, and the temperature can be measured by thermocouples. Furnaces that use electricity, gas, and liquid fuels can automatically control and adjust the temperature with an instrument.
1. Well quenching furnace
Shaft quenching furnace use: various materials of long rod (shaft) type, casting and forgings, long pipe workpieces heating, normalizing, quenching, annealing, tempering, tempering and other heat treatment use. The quenching process is mainly used for steel parts. When commonly used steel is heated above the critical temperature, all or most of the original structure at room temperature will be converted into austenite.
The steel is then rapidly cooled by immersion in water or oil, and the austenite is converted to martensite. Martensite has the highest hardness compared to other structures in steel. Rapid cooling during quenching will cause internal stress inside the workpiece, and when it is large to a certain extent, the workpiece will be twisted and deformed or even cracked. For this purpose, it is necessary to choose the appropriate cooling method. According to the cooling method, the quenching process is divided into four categories: single-liquid quenching, dual-media quenching, martensitic graded quenching and bainite isothermal quenching.
Trolley type quenching furnace: the trolley can be moved in addition to tilting, so it is different from the general trolley furnace, before operation, the trolley is charged outside the furnace, and the workpiece to be heated is placed on the bottom plate of the trolley or the special pad iron by the crane, and then the trolley is sent into the quenching furnace by the chain drive mechanism for heating, after heating, the motor pulls the trolley out of the furnace, and then starts the tilting device to discharge, and the electric mechanism can flip the trolley at a certain angle. The workpiece is quickly poured into a side quenching tank and quenched. No basic installation is required, and it can be used on a level floor.
2. Box quenching furnace
Chamber quenching furnace, also known as box resistance furnace, is divided into ordinary chamber resistance furnace and sealed controlled atmosphere box multi-purpose furnace. The advantages of not adding shielding gas are cheap and simple in structure. Disadvantages: easy to produce decarburization, oxide scale, easy to produce heating deformation for shafts and long strip parts. The heating time is slower. It can realize the quenching, annealing and normalizing process of parts.
3. Aluminum alloy quenching furnace
The structure of the aluminum alloy quenching furnace consists of a heating hood and a mobile base frame. It is suitable for solution heat treatment and time-sensitive treatment of large and medium-sized aluminum alloy product parts.
4. Mesh belt quenching furnace
The mesh belt quenching furnace uses intermittent or continuously advancing mesh belts to pass the workpiece through the temperature-controlled heating zone, and then reach the furnace type required by the quenching process. Mesh belt quenching furnace is suitable for batch small and medium-sized mechanical parts such as standard parts, bearings, chains, self-tapping screws, textile hardware, hand tools, elastic pads, various textile needles, sewing needles in the controlled atmosphere for carburizing, carbonitriding, quenching and other heat treatment; It can also be completed by quenching, tempering, cleaning, drying and other processes. Size specifications can be customized according to user workpieces, process requirements, daily output to develop and design.
5. Vacuum quenching furnace
Vacuum quenching furnace is suitable for solution treatment and timely treatment of large and medium-sized vacuum product parts.
Vacuum high-pressure gas quenching furnace is a very advanced vacuum heat treatment equipment, its excellent performance and unique design provides a wide range of applications for high-speed steel, mold steel, stainless steel, alloy steel, titanium alloy and other alloy materials high-precision parts vacuum bright gas quenching, annealing, magnetic material sintering and rapid cooling characteristics.
