Environment protection and energy quenching technique Flying Eagle - On the "Cayou water" double quenching

Abstract: quenching medium is an important guarantee for the implementation of quenching, heat treatment of metal materials, the quality of the work piece has a great impact. Wuhan University of Technology has a quenching energy saving Technology. "Cayou water" double-quenching method, also known as the "Flying Eagle quenching" (Flying Eagle is one of technological innovation), is worthy of promotion. This quenching method is suitable for simple low-carbon steel, carbon steel, low alloy hardened steel and stainless steel and surface rust treatment.

Paper Keywords: quenching medium, two liquid quenching, quenching flying birds
0 Introduction
Quenching the metal processing, metal parts need to be heated to a suitable temperature and for a period of time, then immersed in the rapid cooling quenching medium. Steel quenching (with a certain temperature tempering) is the most important heat treatment process, but also uses the most a wide range of processes. According to the different heating temperature, heating rate of speed, the heating medium and heat conditions, quenching and cooling of different parts in different ways, quenching methods are a variety of classifications.

Production practice the most widely used classification is based on quenching by the different cooling methods. Include: single liquid quenching, two liquid quenching, quenching martensite classification of bainite austempering, quenching compound, also used a special compression artifacts air hardening (air quenching), spray quenching, jet quenching, quenching pre-cooling method (air, water, oil and rub the water pre-cooling, Cayou pre-cooling).

Commonly used quenching medium are: water, sodium silicate solution, saturated aqueous nitrate medium, zinc chloride. Base quenching medium, aqueous polyvinyl alcohol, mineral oil, alkaline, molten salt, molten alkali.

1 "flying birds quenching technique" a "Cayou water" double-quenching method
Quenching medium is to implement an important guarantee for quenching process, heat treatment of metal materials, the quality of the work piece has a great impact. Wuhan University of Technology engineering training center there is a quenching energy saving Technology a "Cayou water" double-quenching method, also known as "Flying Eagle quenching technique" (Flying Eagle is one of technological innovation), is worthy of promotion. This quenching method is suitable for simple low-carbon steel, carbon steel, low alloy steel and stainless steel anti-rust treatment and surface hardening. If : Student Training Products small hammer, handle, special non-standard nut and screw. especially the small hammer, the national science and engineering students, secondary students, technical school students and vocational school students of the bench and metalworking, or training the majority of To make a small hammer. small hammer hardened by this method is very convenient. This not only improves the production of a small hammer hardness, but also rust-proof, students can also learn treatment knowledge.

This method is very simple, is to clean the machine, maintenance, machine oil after cotton yarn not put water (preferably hot water), the quenching medium made of. So, a thin layer of oil will surface, the formation of oil water quenching medium of a "flying eagle quenching liquid", this method can replace the "water quenching oil cold" medium. in the traditional two-quenching most frequently used method is to water oil and water and oil separately, as it can to ensure quenching hardness. Although the kitchen are stainless steel with a kitchen knife has been popular, but before the kitchen knife used to play for the blacksmith folder steel, the blade is steel, iron cutter body, and its method is to first oil after quenching water, it also ma niu quenched .

We are in the production practice, when the water issue "hiss" sound to "hiss" sound weak immediately removed. Another way is to use feel the vibration in the water study, the vibration began to weaken immediately removed. Remove and cool in the air . This purpose is no longer heating temper, more energy saving, let self-tempering.


For some hardening parts, such as chisel, flat shovel and other waste heat tempered by cooling, called self-tempering. Since the tempering temperature difference between inside and outside the workpiece is caused by the difference in temperature makes the self-quenching and tempering some of reach. Is generally used in surface hardening of the product, control the cooling time, so that the surface temperature is cold enough to stop the cooling, so tempered by the heat. mainly used in the larger size of the workpiece Mass Effect, for example: After the surface layer quenched after the fire, which the Department is still 600-700 �� have the warmth, then the residual heat finish the fire passed to quench the surface layer, is a self-tempering process. in the production practice self-tempering, mainly by the part surface to control the color temperature, such as yellow for the 220 -255 ��, blue for the 300 ~ 315 ��. can also use the temperature pen or touch the surface temperature thermometer for temperature measurement. low-carbon steel quenched, because the Ms point temperature is higher (> 350 ��), obtained by quenching low-carbon martensite, quenching and cold in the middle will be tempered, access tempered martensite, the strength and toughness of the steel are improved. Therefore, since the tempering of low carbon steel will occur (or "quenching and tempering "). We are prepared" flying eagle quenching liquid "energy saving double-quenching media, the general factory waste oil along with cotton yarn are drained, very environmentally friendly. If the oil soaked cotton hot or cold water repeatedly (in quenching in cold water also variable heat), can also repair machines and saponification liquid such as waste oil collected, involuntary Dumping and water and then mixed together, the proportion of oil and saponification solution should not exceed 10%. In this way, environmentally friendly and energy saving . The quenching medium not aging, long life, and has excellent rust and corrosion performance. quenchant worry about impurities and quenching medium impurities other issues. Links to Research Papers Download http://www.hi138. com 2 Other common characteristics of the quenching medium is as follows:
Chemical Industry Press, published in February 2009 <<Featured quenching medium heat utility> "was Written description of the various quenching media, nearly 400 varieties and specifications. But the main quenching medium has the following 3 categories of its features:
(1) water is the application of the earliest and most extensive, most economical quenching medium, it is cheap, non-toxic, non-burning, physical and chemical properties of stability, the cooling ability. By controlling the water temperature, increased pressure, increased flow rate, the use of recycled water, the use of magnetic field, etc., can improve the cooling characteristics of water, reduce distortion and cracking, quenching to obtain ideal results. However, these methods need to increase the specialized equipment, and the properties after quenching is not very stable, so not to be widely used. Therefore, water is only suitable for a small number of low carbon content, hardenability and the shape of a simple low-hardening steel used. most parts easy to crack with water quenching, quenching crack is due to well known : The low temperature water cooling too quickly. This is a major drawback of pure water. pure water because the water temperature, cooling of the vapor film stage rapidly extended so that the stress-induced long as the deformation provides good plasticity, stress the role of Congress and the conditions for a long time, so not only cause severe uneven hardness, quenching will increase the distortion of the workpiece. the cooling characteristics of water are particularly sensitive to water temperature.

(2) The degree of quenching oil is usually higher refined paraffinic neutral oil as base oil, it has a high flash point, low viscosity, smoke less, oxidation resistance and good thermal stability, long life, quenching oil is only used in good hardenability, the wall thickness is not complex shape, requiring little deformation hardening of the workpiece. quenching oil on the surrounding environment, pollution, quenching easily cause a fire.

(3) salt easy to aging, oxidation and corrosion of the workpiece with the role. Molten alkali are sodium hydroxide, potassium hydroxide, it has a greater cooling capacity, if not oxidized when heated workpiece, obtained after quenching silver clean surface, there are certain applications. but melting alkali vapor is corrosive to the skin stimulation, used to pay attention to ventilation and protective measures.

3 Conclusion
"Flying Eagle quenching liquid" characteristics of two liquid quenching medium - energy saving. As the "Flying Eagle quenching liquid" is oil on the water of the two liquid media, and the impurities in the water is high quality, low cost, high performance of the quenching medium, is actually more suitable than pure water, water, solid particles (broken iron, copper scrap and sand, etc.) and saponification solution to help clean the surface of the membrane effect and undermine the role of steam, making the cooling rate increases, prevent quenching spots occur. As the ordinary rate of oil and cooling water distribution curve is very wide gap between the zones, and the "flying birds quenching liquid" can be partially fill the blank areas. Therefore quenching, no water and mixed water The quenching Technology is a very important concept. Also, the oil on the water quenching medium, because of the oil (5% ~ 10%) less water and more, the production of a clean environment, not combustion, very little smoke, quenching due to Water accounts for 90% to 95%, so the oil temperature is not high. hardened parts without cleaning, without tempering, very energy saving, low production costs. Use of low concentration, low viscosity, the workpiece with a very small amount of oil, but also can rust. to avoid the "oil quenching and water quenching is not hard crack" phenomenon.

Low carbon steel quenching, quenching medium not need to waste oil, cotton oil as long as you can, its better than not filling yarn quenching effect is much better, much brighter than the surface, the carbon steel hardened, you can add waste oil and liquid waste such as saponification. Of course, this quenching method is only suitable for simple low-carbon and medium carbon steel hardened and surface rust treatment. "flying birds quenching technique" can significantly save energy and resources to help protect the environment. This is a worthy application of advanced science and technology, can effectively reduce the distortion components, parts and components to prevent cracking and improve the quality of heat treatment technology. This method has broad promotion, application development prospects, is conducive to sustainable development. Links to Research Papers Download http://www.hi138.com