0 Low-voltage pulse vacuum heat treatment Overview Heat treatment is one of the four basic industries of mechanical manufacturing (casting, forging, heat treatment, welding) and is a very important key process in the manufacturing process of mechanical products. Mechanical engineering can not be separated from the mold engineering, mold engineering and heat treatment are closely linked. Heat treatment is achieved by placing the metal material in a certain medium to heat, incubate, and cool to change its surface or internal structure to achieve the desired performance requirements. It is the main means to ensure the intrinsic quality of mechanical parts and tooling. It is an effective way to fully realize the potential of metal materials and save materials. Proper heat treatment can improve the service life of parts and tools, improve product quality, and strengthen the market competitiveness of products. After China's accession to the WTO, the manufacturing industry is facing new opportunities and challenges, and it will also enter a new period of important development. However, the gap between the level of heat treatment technology in China and the developed countries is still large. The main surface equipment, process behind, the oldest furnace (box type, well type, salt bath furnace), controllable atmosphere and less vacuum furnace, heating furnace efficiency is low, energy consumption, parts of the serious oxidation and decarbonization, often products Quality is not guaranteed. With the development of industries such as automobiles, motorcycles, information industries, construction machinery, agricultural machinery, aerospace, weapons, environmental protection equipment, and mechanical basic parts, especially the rapid development of the tool and mold industry, China’s large and small heat treatment plants are actively adopting Advanced technology continues to carry out technological transformation and equipment updates, and strive to achieve "high-quality, high-yield, low-consumption" production. The heat treatment equipment suitable for China's national conditions will be some special equipment with small investment or flexible production lines. In response to domestic and international development trends and domestic demand, after years of research and practice, we have developed a "low pressure pulsed vacuum heat treatment process." And related heat treatment equipment, including low-pressure pulse vacuum nitriding furnace, carburizing furnace, less oxidation-free heating furnace and other new equipment. This is exactly the quality of the green furnace industry, which is the quality, low-cost, high-efficiency, and environmentally-friendly quality of the vast majority of workers, and it is a series of innovative products with Chinese characteristics and national conditions. This heat treatment equipment can realize low pressure pulse vacuum nitriding, carburizing, nitrocarburizing, carbonitriding, oxynitriding, multi-component co-permeation, and less oxidation-free heating. The so-called "vacuum treatment" refers to placing the workpiece under negative pressure conditions and processing. The low-voltage pulsed vacuum heat treatment is a heat treatment process that combines the advantages of vacuum heat treatment and pulse heat treatment. This technology can be used to replace old-fashioned traditional heat treatment and old conventional heat treatment processes. As we all know, the quality of heat treatment depends on the heat treatment process and equipment. Advanced heat treatment equipment not only can properly complete the heat treatment process but also has the functions of energy saving and pollution prevention, thus achieving energy saving, precision and green heat treatment. 1 low pressure pulse vacuum furnace working principle, equipment structure and process! Features Vacuum furnaces manufactured using the principle of low-voltage pulse can overcome the shortcomings of the old three furnaces. At the same time, they have the advantages of vacuum furnaces and controlled atmosphere furnaces. They can realize less non-oxidative heating and can control the atmosphere heating, without its sale. The disadvantage of high prices and difficult maintenance. This process also has the function of automatic control of furnace pressure, which can achieve rapid exhaust and increase the speed of carburizing and nitriding. The working principle, equipment structure and main technical features of the heat treatment process of this furnace are briefly described as follows: 1.1 Operating Principles The workpiece is heated by a pulse in the upper and lower limits of the set low vacuum, and the furnace gas reciprocates on its own during the set process time period. Can solve the workpiece in nitriding, carburizing process furnace gas aging and packing caused by non-uniform and other technical problems. This kind of pulse heating in the low vacuum range, followed by positive pressure heating process, our main call it low pressure pulse vacuum heat treatment. This process technology is also very effective in box-type non-oxidation heating furnaces. Furnace in the low vacuum (negative pressure) to a large range of positive pressure pulse pressure heating with a neutral gas to quickly replace the furnace air, moisture and other oxygen-containing medium, and then the process specified by the seepage agent to heat the workpiece in the set atmosphere After the heating, if it is cooled in the furnace, less oxidation-free heat treatment can be realized. It should be particularly pointed out that the pulse (nitriding, nitrocarburizing) process has three ways to change the furnace pressure: negative pressure pulse: the furnace pressure periodically changes in 1 atmospheric pressure range; Cool different kinds of heat to cool the heat bl vegetable ring 3 positive and negative pressure pulse: the upper pressure is positive: the negative value of the pulse, and pulse vacuum can be considered to be alternating vacuum and non-vacuum. Low pressure pulse vacuum heat treatment uses positive and negative pressure pulse principle. The company's low pressure pulse vacuum heat treatment changes the furnace pressure from a set negative pressure to a set positive pressure within a specified time, and maintains a different time at this pressure, and then rapidly depressurizes to the set ring Process until the time required to complete the process. 1.2 Features of the equipment structure Low-pressure pulsed vacuum furnace Maximum operating temperature up to the stirring fan flowmeter Well-type low-pressure pulse vacuum heat treatment furnace 1.3 Main technical features 1.3.1 Improve production efficiency and reduce production costs After the workpiece is put into the furnace, the furnace is evacuated. The air is discharged to achieve rapid exhaust, reduce the ventilation time, increase the infiltration rate, thereby shortening the production cycle, increasing production efficiency and reducing production costs. 1.3.2 Obtaining high-quality penetrating layer Pulse evacuation has degassing and purifying effect on the surface of the workpiece. In the low vacuum state, the surface activity of the workpiece is strengthened, the adsorption capacity of the surface of the workpiece is increased, and the diffusion is accelerated. A dense and uniform layer can prevent internal oxidation and prevent the formation of black tissue to improve the quality of the layer. Since the pulse process replaces the furnace gas alternately by pumping gas or inflating gas, the exchange of old and new gas can reach any part and corner, and solves problems such as infiltration or seepage of parts with small holes, blind holes and slits. Unequal technical problems. Because the positive and negative pressure pulses are larger than the pure negative pressure pulses and the pulse amplitude is large, the dual chamber low pressure pulse vacuum heat treatment furnace meets the technical requirements of different materials. Because the positive and negative pressure pulses are larger than the negative pressure pulse voltage modulation amplitude, the rate of nitriding or nitrocarburizing can be improved, and the quality uniformity of the permeation layer of the small hole, the blind hole, and the pressing surface can be further improved, and the common seepage can be achieved. Nitrogen can not achieve the effect of heat treatment. 1.3.3 Increase the utilization of equipment Under low-pressure pulse vacuum, the workpiece can be packed to improve the equipment utilization. 2 Prospect Low pressure pulse vacuum heat treatment is another innovative technology of vacuum heat treatment, which helps to improve the quality of heat treatment, improve production efficiency, reduce production costs, and promote the technical development of China's heat treatment industry. With the continuous improvement and development of low voltage pulsed vacuum heat treatment technology and its application, high quality, low cost, energy saving, precision, high efficiency, environmental protection and sustainable development of heat treatment will be important for the development of this technology. (The osmotic compound layer can be controlled by yttrium, and can) lishi. House.Allrightsreserved, http:// Solvent Based Putty,Solvent Based Glue,Solvent Based Grease,Petroleum Based Adhesives CHANGXING GUANGDA NEW MATERIALS CO.,LTD. , https://www.gdbentonite.com
Low Pressure Pulse Vacuum Heat Treatment New Technology
Core Tips: 0 Overview of Low-Voltage Pulse Vacuum Heat Treatment Overview Heat treatment is one of the four basic industries of mechanical manufacturing (casting, forging, heat treatment, welding) and is a very important critical process in the manufacture of mechanical products. Mechanical engineering can not be separated from the mold engineering, mold engineering and heat treatment are closely linked. Heat treatment is through gold