Vacuum Furnace Maintenance

 Vacuum Furnace Maintenance

1, In accordance with the PLC program drawn low vacuum: closed all vacuum valves, start mechanical pump, wait until after normal operation (about 1-2 min), open the way to the furnace of the low vacuum valve that is on the butterfly valve, pre-furnace Low vacuum pump body;
2. The high vacuum pumping PLC program: Open the next disc valves, diffusion pump suction, when the vacuum reaches 15 Pa or less, the system automatically turns on diffusion pump to warm up, usually after about 45 min diffusion pump begins its role, We can close the butterfly valve, the main barrier valve to be open at the same time a vacuum of 1.33 × 10Pa or more, before they can turn the heating button samples were heated.
 Vacuum furnace maintenance equipment operator guides within the purview of the equipment point inspection of each site, with the correct test methods and tools for routine maintenance of equipment in accordance with point inspection cycle; the operator need daily basis this maintenance manual carefully fill out the "heat treatment equipment routine maintenance record "by the inspection team leader for review, maintenance staff collecting the archive. After a full set of equipment according to the technical requirements of the installation is complete, no missing parts and have a good grounding, you can press the following project commissioning and acceptance.

Vacuum furnace production practice of ultra-low carbon steel

         Vacuum furnace production practice of ultra-low carbon steel

Vacuum furnace production of ultra-low carbon steel, the early stage of the process is the most difficult to control the rapid aluminium deoxidizing and alloying of decarburization and late. For huaqiang vacuum furnace, on the premise of basic stable equipment performance, through optimizing decarburization process operation process, summarize utilization coefficient of carbon and oxygen reaction and the rate of the aluminium deoxidizing and alloying, figure out some empirical formula, greatly reducing the vacuum processing time, speed up the production rhythm, improves the product quality.
1. The technological process of the vacuum furnace to produce ultra-low carbon steel
  Converter of the molten steel - steady oxygen measurement sampling - light processing measured again seven minutes to steady oxygen to 8 minutes of deep decarburization process, steady oxygen measurement sampling - aluminium deoxidizing and alloying - cycle after 3 minutes to steady oxygen measurement sampling, 5 minutes after the steel net cycle.
  According to this process, difficult control mainly has two aspects, first, how to take off carbon to the lowest in 15 minutes; Second, according to 15 minutes after the decarburization of the residual oxygen content in liquid steel, aluminum one-time add in position, aluminum DNA can be ensured and the aluminum alloy and can guarantee. In this way, the smelting time can control between 25 to 30 minutes. Otherwise, the vacuum processing time was significantly longer. Smelting in the process of production of ultra-low carbon steel, as the extension of time, the contact between refractory material and steel liquid will lead to carbon steel back, in addition, the amount of ultra-low carbon steel because of the addition of aluminum is larger, a lot of Al2O3 inclusions produce, so the aluminum to join the sooner, the more conducive to Al2O3 inclusions floatation, the more conducive to the process after the operation and improve the quality of our products.

Vacuum high-pressure gas quenching furnace

Vacuum high-pressure gas quenching furnace

Usage:
It is mainly used for high speed steel, die steel, stainless steel quenching; Stainless steel and titanium alloy solid solution treatment; Magnetic Material of vacuum heat treatment and high temperature brazing and vacuum sintering. Add convection fan can also be to low temperature tempering.
Structure features:
Heating chamber adopts stainless steel skeleton, new carbon felt composite material, less deformation, resistance to high temperature and high pressure air flow Washing, long service life, easy maintenance. Using graphite tube heater, easy installation and maintenance, low failure rate. Air cooled by jet cooling way, graphite nozzle circumference uniformly distributed, make high pressure air flow more reasonable (part of the main duct air volume size adjustable, customers can according to the characteristics of the artifacts the size of the control part of the main duct airflow), can effectively control the workpiece deformation. High speed and high pressure large flow fan, copper, copper efficient circular heat exchanger, achieve rapid cooling. Fan can use single speed, double speed, frequency control of motor speed in a variety of ways, air cooling speed control. Heating chamber can also adopts full metal structure, in order to satisfy the requirement of the titanium alloy, precision alloy solid solution treatment. Electric control system adopts PLC and programmable temperature controller, realize fully automatic, semi-automatic and manual control modes of three, flexible operation.

What constitutes a vacuum furnace

     What constitutes a vacuum furnace

 Vacuum furnace generally consists of furnace, electric devices, sealed furnace shell, vacuum system, power supply system and temperature control systems and other components. Sealing furnace shell welded carbon steel or stainless steel, removable parts for sealing joints vacuum sealing material. After the furnace shell to prevent heat deformation and heat deterioration of the sealing material, the furnace shell is generally cool with water cooling or air cooling. The sealing furnace furnace shell. According stove use, the chamber with internal heating elements of different types, such as resistors, induction coils,   electrodes, and an electron gun and so on. Metal smelting furnace built with vacuum furnace crucible, some also equipped with automatic pouring device and the loading and unloading of robots. Vacuum system consists of vacuum pumps, vacuum valves and vacuum gauges and other components. Vacuum furnace by heating element into the vacuum resistance furnace, vacuum induction furnaces, vacuum arc furnace, vacuum consumable arc, electron beam furnace (also known as electron bombardment furnace) and a plasma furnace.