Selection of Vacuum Furnace

1. Vacuum heat treatment furnace can be divided into vacuum quenching furnace, vacuum tempering furnace, vacuum annealing furnace and so on.
1. Vacuum quenching furnace; vacuum quenching furnace can be divided into vacuum oil quenching furnace and vacuum gas quenching furnace.
1. 1 Vacuum oil quenching furnace is suitable for vacuum heat treatment of die steel, spring steel, stainless steel, bearing steel, superalloy steel, etc. Its main features are wide data scale, strong hardenability, low cost and reusable quenching oil. The shortcomings are: the deformation is relatively large, and the workpiece needs cleaning afterwards. The vacuum oil quenching furnace can be divided into two-chamber furnace and three-chamber furnace.
1. 2 Vacuum high pressure gas quenching furnace is suitable for vacuum heat treatment of high speed steel, stainless steel, die steel and other materials with good hardenability. It is characterized by small deformation of parts and no need for cleaning after heat treatment. The shortcomings are that quenching gas can not be recovered and the cost is high. Vacuum high pressure gas quenching furnace can be divided into horizontal type and vertical type. Horizontal type can be divided into single room, double room and three rooms. Vertical type is suitable for heat treatment of ring-shaped, cylindrical and long rod-shaped parts. The quenching pressure of vacuum high pressure gas quenching furnace is generally 2B a r~10b a r. According to the user's needs, parts can be selected for pressure furnace type.
2. Vacuum tempering furnace: Vacuum tempering furnace can be divided into single chamber, double chamber and vertical type. The highest temperature of heating with nickel-chromium strip is 800 C. Vacuum tempering furnace is generally applicable to require bright surface and no oxidation color after tempering.
3. Vacuum annealing furnace: Vacuum annealing furnace can be divided into single chamber, double chamber and vertical type. Vacuum annealing furnace can select medium and high temperature and low temperature (800 ~1350 C, 800 C) according to the data of parts.
II. Selection of Heating Chamber for Vacuum Furnace
1. Graphite reflecting screen: There are two kinds of hard felt and soft felt commonly used in vacuum furnace. They are suitable for quenching, tempering and annealing of general steel. High temperature brazing, powder metallurgy and sintering, etc.
2. Metal heat shield; stainless steel and molybdenum are commonly used in vacuum furnaces. Molybdenum reflective screen is suitable for quenching, annealing and high temperature data (such as superalloy, titanium alloy, magnetic data, etc.) which require high temperature and environment in furnace.
Warm brazing, sintering, etc. Stainless steel rice shooting screen is suitable for tempering, low temperature annealing, aging, vacuum aluminium brazing, and some low temperature furnace type selection.
3. Selection of Vacuum Degree
1. Quenching heat treatment can choose medium vacuum (general limit 4X10-1PA) and two-stage pumps (front pump and Roots pump) such as bearing steel, die steel, structural steel and so on.
2. Vacuum heat treatment or brazing at high temperature for some products requiring high vacuum, such as superalloys, titanium alloys, magnetic materials, etc. Three-stage pump (front pump) can be selected. Roots pumps, decentralized pumps, etc.) generally require a vacuum limit of 10-4 Pa.
Selection of Control Systems
1. Standard configuration; with imported temperature controller and programmable controller as the center, temperature programmable, manual and active control is completed.
2. Control system of accounting machine; process programming centered on industrial computer and programmable controller, storing and making report forms. It can operate independently, actively, manually, process programming and so on.
3. Cluster control system of accounting computer; high-tech control system of monitoring, collecting data, operating status and report management of several vacuum furnaces with industrial computer as the center.
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