Vigorously promote the application of new quenching media
1. The significance of popularizing and applying new quenching media
New quenching medium usually refers to various special quenching oils and high-quality water-soluble quenching agents. Compared with ordinary engine oil, special quenching
The oil has a stronger cooling capacity, a more reasonable cooling rate distribution, a longer service life, or better keeping the workpiece bright
Sex. High-quality water-soluble quenching agent can reduce the low-temperature cooling rate of steel parts during quenching in water to varying degrees, thus preventing quenching cracks
, Or to obtain higher quenching hardness and deeper quenching depth. Because of these advantages, the promotion and application of new quenching media can obtain
The following results.
1. Improve and enhance the internal quality of quenched workpieces
High-quality water-based quenching agent can effectively reduce the low-temperature cooling rate of water, so it can prevent quenching cracking of the workpiece. Special quenching
Fire oil and water-based quenching fluid have higher cooling capacity than ordinary engine oil, so higher quenching hardness and depth of quenching can be obtained;
At the same time, the reasonable cooling rate distribution of the quenching medium can reduce the quenching deformation of the workpiece. All of these can be improved and improved
The quality of the quenched workpiece.
2. Prevent fire and clean the production environment
Most of the workpieces quenched in heat treatment production are medium carbon or medium and low carbon low alloy steel. These steel parts can be
Use water-based quenching agent with appropriate cooling rate to quench. Water-based quenching agent does not burn, and there is no smoke during quenching. Therefore, from the oil
Quenching is changed to aqueous medium quenching, which not only improves the internal quality of the workpiece, but also prevents fire hazards and cleans the production environment.
3. Improve production efficiency
Special quenching oil has a faster cooling rate than ordinary quenching oil. The water-based quenching medium also cools faster than ordinary engine oil. therefore,
Changing to a new quenching medium can shorten the quenching cooling time of the workpiece, thereby improving production efficiency. For example, hardening of automobile leaf springs,
After changing from ordinary engine oil to grade 20 water-based quenching agent, the residence time of the plates on the quenching machine can be reduced by about half. the result,
Without increasing production equipment and manpower, the production capacity of the leaf spring quenching line can be increased by about 30%. Deep carburized parts
It can be seen that when a suitable water-based quenching agent or thick and large quick quenching oil is used instead of ordinary engine oil, the quenching hardness of the workpiece can be significantly increased
化层。 The layer. In other words, if the hardened layer is required as the target, after switching to a quenching medium with a faster cooling rate, the penetration of the workpiece can be shortened.
4. Reduce steel cost and save alloying element resources
The main effect of adding alloying elements to structural steel is to improve the hardenability of steel. Therefore, the hardenability of steel with high alloying elements
Better, it can be used to make thicker parts. The steel with less alloying elements usually has lower hardenability and can only be used to make thin and small parts.
Pieces. However, from the heat treatment theory, in addition to alloying, it is also possible to increase the quenching cooling rate of the workpiece.
Method, that is, select a quenching medium with a faster cooling rate to increase the hardening depth. Obviously, under the premise of ensuring that the workpiece is not quenched,
Changing the quenching medium is more economical than changing to a steel grade with more alloying elements. Still take the automobile leaf spring with larger output as an example. Leaf spring quenching
The fire requires full hardening, quenching in ordinary engine oil, such as 60Si2Mn steel, the maximum thickness that can be hardened is 11mm, which exceeds
At 11mm, spring steel with better hardenability must be used, such as 55SiMnVB or 60CrMnB. However, use the appropriate fast
Quenching oil, the maximum hardening thickness of 60Si2Mn leaf spring can reach 15mm; using water-soluble quenching agent, the maximum hardening thickness of 60Si2Mn
It can reach 18-20mm. If this kind of replacement is realized, the use cost can be reduced by 500 while ensuring the same mechanical performance.
~1000 yuan/ton. If a factory with an annual output of tens of thousands of tons of leaf springs can replace 10,000 tons of steel, it will not increase
Under the conditions of manpower, capital and equipment, an annual income of 5-10 million yuan will be increased, and the fire hazard will be eliminated at the same time.
In order to improve the working environment, the use of new quenching media can reduce the amount of steel with higher alloy content, and it is also a way to save alloying element resources.
2. Correctly understand the new quenching medium
Because it is a new thing, and there is not much publicity and lack of systemicity, so far, some heat treatment workers even have
Some quenching media manufacturers still lack understanding of new quenching media, which is mainly manifested in the following aspects:
1. The cooling characteristics of the quenching medium have a great influence on the quenching quality. However, in the analysis to solve the heat treatment quality problem of the workpiece
At that time, many people did not know that the characteristics and changes of the quenching medium were considered as a factor.
2. Some manufacturers of quenching agents do not really understand the characteristics and usage of their products, and some even do “can be made from
“Quenching liquid with any cooling capacity between water and oil” does not conform to actual propaganda.
3. Just as some people don’t know that there are different types and characteristics of steel, some heat treatment workers still use different quenching media.
The quality is regarded as the same thing, so some mistakes have occurred: such as failing to choose a suitable quenching agent, or choosing an inappropriate
After the quenching medium made mistakes, I was afraid of straw ropes for ten years, and I dare not care about all the quenching mediums.
4. I don’t understand that quenching oil has its unique and irreplaceable advantages, and blindly expand the application of some high-quality water-based quenching agents
To inappropriate occasions.
5. In the quenching process, what affects the quenching quality of steel parts is the cooling characteristic distribution of the quenching medium, not the quenching medium
The total cooling time from high temperature to low temperature. Therefore, you should not simply use “normal”, “fast”, and “overspeed” to evaluate and
Divide the quenching oil.
6. After using quick quenching oil or aqueous medium instead of ordinary mineral oil, the steel grade with lower hardenability is not used to reduce
Low cost and resource saving.
The above misunderstandings hinder the promotion and application of the new quenching medium. In view of this, it is necessary to strengthen this
Three, choose the conditions needed to make good use of the new quenching medium
In industrial production, to select a new quenching medium, certain conditions are required. These conditions include: quenching medium production
The manufacturer can provide effective technical services, use the factory for proper management, have basic equipment conditions and a certain technical force.
1. Active and effective technical service of quenching medium production plant
The quenching medium production plant should not only provide high-quality quenching agent products, but also have the ability to supplement active and effective technical services
. This service includes the ability to correctly guide users to choose the appropriate quenching medium variety, provide and even teach usage techniques on site, and have
The ability to deal with possible problems.
2. The user needs to be properly managed
New water-based quenching media usually require regular concentration detection and adjustment. Special quenching oil can only use oil with the same performance or
Oil additives that can guarantee performance are supplemented. The temperature of the quenching liquid should be paid attention to and controlled during use. Quenching fluid should be guarded
To prevent or minimize pollution, all of these can only be solved by management. Therefore, strengthening management is to make good use of new quenching media.
The first premise.
3. Basic equipment conditions
Mainly refers to devices and instruments for measuring and controlling concentration and temperature, as well as circulating cooling, heating and stirring devices. Of course, heat treatment
, Quenching and tempering heating should be able to carry out temperature measurement and control, there should be instruments and devices such as hardness testing and metallographic analysis.
4. There should be a certain technical force
Must have heat treatment technicians, and the operator should have the necessary heat treatment knowledge. With a certain technical force, can
Scientifically analyze and distinguish the problems in use, and take correct measures to solve them in time. In summary, in our country
In the heat treatment production of the machinery industry, vigorously promote the application of new quenching media, which can improve the springs of mechanical parts, especially for mass production.
The product quality of basic parts, improve production efficiency, reduce production costs, prevent fires, clean the environment, and save alloy element resources
Sources are beneficial to the factory and society. As long as we pay attention to publicity and properly organize it, we can promote it and take advantage of it.
Obtain long-term and stable benefits.