Safety technology for heat treatment of the hottes

Casting heat treatment safety technology

in order to make all kinds of mechanical parts and processing tools obtain good performance. Or to make various metal materials easy to process, it is often necessary to change their physics. Chemical and mechanical properties such as magnetism, corrosion resistance, high temperature oxidation resistance, strength, hardness, plasticity and toughness of San Francisco St. Matt bridge, which was built in 1929. This requires changing the internal structure (Organization) of metals and alloys through heating at a certain temperature, heat preservation for a certain time and cooling at a certain speed in machining, so as to change the physical, chemical and mechanical properties of metals and alloys. This method is called heat treatment. During this work, workers often contact with equipment and metal parts, so they must carefully master relevant safety technology to avoid accidents

(I) main heating equipment for heat treatment process. The main equipment in the heat treatment process is the heating furnace, which can be divided into two categories: fuel furnace and electric furnace

1. Fuel furnace. Heat sources are generated by solid, liquid and gas combustion, such as coal stove, oil stove and gas stove. Most of the thermal energy directly generated by combustion is primary energy, with economic value and low consumption. The general requirements are 0.2 ~ 0.4, but it is easy to decarbonize and oxidize the surface of the workpiece. It is commonly used in the heat treatment of heated workpieces and materials with general requirements, such as tempering, normalizing, annealing and quenching

2. Electric stove. Take electricity as thermal energy, that is, secondary energy. According to different heating methods, it can be divided into resistance furnace and induction furnace. According to different heating workpieces and materials, different forms of electric heating furnaces should be equipped according to the process requirements

(1) resistance furnace. The resistor is mainly used as the heating element and electric furnace. According to the requirements of heat treatment process, annealing, normalizing, tempering, quenching, carburizing, oxidation and nitriding can be carried out, and the problem of no oxidation can also be solved

(2) induction furnace. Through electromagnetic induction, the induced current is generated in the workpiece to quickly heat the workpiece. Induction furnace heating is an advanced method in the heat treatment process, which is mainly used for surface heat treatment and quenching, and then gradually expanded to normalizing, quenching, tempering and chemical heat treatment, which can effectively avoid the pollution of hydraulic oil caused by external impurities entering the hydraulic system, especially for some special steels and workpieces with special cutting requirements

(II) general safety requirements for heat treatment operation

1 Before operation, first of all, be familiar with the heat treatment process specification and the equipment to be used

simply say

2 During operation, you must wear necessary protective articles, such as work clothes, gloves, protective glasses, etc

3. Do not place anything that interferes with operation between heating equipment and cooling equipment

4. Mixing carburizing agent, sand blasting, etc. shall be carried out in a separate room, and sufficient ventilation equipment shall be set

5. Equipment dangerous areas (such as power leads, bus bars, conductive rods and transmission mechanisms of electric furnaces, etc.) should be protected with iron wires, fences, plates, etc

6. All tools used for heat treatment should be placed in an orderly manner, and cracked and inappropriate tools are not allowed

7. The entrances and exits of the workshop and the access roads in the workshop should be unimpeded. Fire extinguishing sand boxes should be placed near the nozzles of heavy oil furnaces and the nozzles of gas furnaces; Fire extinguishers should be placed in the workshop

8. Do not touch the workpiece after heat treatment to avoid burning