Let s discuss which one is better, salt bath furnace or vacuum furnace quenching mold?

Equipment procurement cost Cost of use Temperature uniformity Product qualification rate Environmental protection Use effect Salt furnace low high good low forbidden use General vacuum furnace high low good high environmental protection products good salt furnace heating to temperature is relatively fast, temperature uniformity is good, short construction period, the disadvantage is that the salt tank is open, the heat loss is relatively large, quenching and transfer need to be skillfully operated, there are variables, and the pollution is serious, the workpiece cleaning is troublesome, it is a strictly forbidden equipment in many areas; The vacuum furnace is simple to operate, the product is stable, and the pass rate is high, that is, the equipment is higher than the conventional equipment.

It's a bit one-sided to say that the salt bath is deformed. Salt bath heating quenching salt can achieve micro-deformation, and even control the size and direction of deformation according to requirements. If the precision requirements are high, the finishing can not be taken off when it comes out; The accuracy requirements are low, and the slightest deformation is not bad.

The vacuum furnace has no decarburization and high service life; Although the salt bath furnace has a very small amount of decarburization, the heating process can compound multi-osmosis and the life is higher. Has anyone thought about it from the cost side. I always feel that the operating cost of vacuum furnace is lower than that of salt bath furnace, and the added value is high, and the profit is not richer.

From ** it is said that salt baths are cheap, vacuum is expensive. The salt bath is deformed and corroded. Cooling is fast. The vacuum is automatically cooled, the deformation is small, and the surface is refreshing. Both hardness can be achieved.

Equipment purchase costs.

Cost of use. Temperature uniformity.

Product qualification rate.

Environmental protection. Effect of use. Salt ovens. Low.

High. Good. Low. Prohibited Use.

So so. Vacuum spoiler furnace. High. Low.

Good. Gao Dou Zhongdan.

Eco-friendly products. Good.

The salt oven heats up to the temperature relatively quickly, the temperature uniformity is good, the construction period is short, the disadvantage is that the salt tank is open, the heat loss is relatively large, the quenching transfer needs to be skillfully operated, there are variables, and the pollution is serious, the workpiece cleaning is troublesome, and it is strictly forbidden to use the equipment in many areas;

The vacuum furnace is simple to operate, the product is stable, and the pass rate is high, that is, the equipment is higher than the conventional equipment.

I think: can not be compared at the same time, the salt oven has the salt oven is good, the vacuum has the vacuum is good! However, the advantage of the crossover of the two furnace types is that the fluid particle furnace is used.

Of course, the salt bath is good, but now that the orange salt bath stove is not opened, the environmental protection bureau will not be able to pass the level. As for the cost of the salt bath furnace, it is difficult to say, the different power of the clear liquid, different furnace types (external heating, internal heating, insertion, embedding, etc.), and different furnace sizes, the difference is relatively large.

Hunan Dingli Technology produces vacuum furnaces and gas quenching furnaces, the difference between them is vacuum furnace: vacuum state heating, single-chamber, double-chamber and multi-chamber, the pressure can reach 300MPa HIP, there is no mold and hydraulic system.

Gas quenching furnace: The working voltage of the electric heating element of the vacuum heat treatment furnace generally does not exceed 80-100 volts. At the same time, effective measures should be taken in the structural design of electric heating elements, such as avoiding cutting-edge parts as much as possible, and the spacing between electrodes should not be too narrow to prevent the occurrence of glow discharge or arc discharge.

There are many kinds of vacuum furnaces: vacuum oil quenching furnace, vacuum air quenching furnace, vacuum tempering furnace, vacuum annealing furnace, etc.

Vacuum furnace is the parent class, gas quenching furnace is a subclass, gas quenching furnace is a kind of vacuum furnace, vacuum furnace includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum tempering furnace, vacuum annealing furnace, vacuum sintering furnace, vacuum brazing furnace ......, this ......Sort of the main difference.

The key to what kind of furnace heating you use depends on what kind of heat treatment process you are doing.

If ordinary annealing is carried out, the pit furnace is good, but the salt bath furnace cannot do it, because the cooling method of the annealing process is furnace cooling, and the salt bath furnace has no way to achieve furnace cooling. Of course, if the isothermal annealing process is used, the salt bath furnace is good, and the pit furnace can also be done, but the isothermal annealing quality is slightly worse.

If the normalizing process, the two furnaces are the same, but the salt bath furnace consumes more electricity and has a high cost.

If it is a quenching process, both furnaces can do it, but if it is to prevent oxidation and decarburization, the pit furnace has to add a protective atmosphere, while the salt bath furnace does not need it, the pit furnace is more troublesome, the salt bath furnace is simpler, but the cost is high for the salt bath furnace, although the pit furnace needs to add additional protective atmosphere, whether it is directly added or through the drip liquid to produce a protective atmosphere, the cost of the salt bath furnace is high, because the salt bath furnace is an electric tiger.

If it is tempered, the pit furnace is the best, the pit furnace has a fan, which can evenly distribute the atmosphere and the cost is low.

If nitriding or carburizing is used (9crsi can be chemically heat treated to increase the surface hardness and thus through the service life), only pit furnaces can be better controlled, and salt bath furnaces can also be carburized (nitrogen) by liquid, but they are not easy to control.

And so on, just like when you travel, whether you walk, bike, take a car or plane, which is better? Depending on the specific distance you travel, the time you allow for travel, and the degree to which your wallet is bulging, you can't generalize.

9CRSI is a commonly used low-alloy tool steel with high hardenability and hardenability, as well as high tempering stability, and is commonly used in small tools and measuring tools. Therefore, the heat treatment with salt bath furnace is good, the efficiency is high, it is not easy to decarburize, and the deformation is small.

Salt bath ovens are better, but also look at the shape. meters long, it is estimated that the salt bath furnace will not meet the requirements.

It depends on whether the specific equipment can meet it.

1.Heating rate. The heating rate of the vacuum furnace is controllable, and the resistance furnace generally does not control the heating rate. The consequence of this is that the thermal stress of the mold is relatively large during the quenching of the resistance furnace.

2.Surface chemical composition. The carbon content of H13 is medium (about the same), and it is difficult to adjust the protective atmosphere to the carbon potential equivalent to the mold material, so the carbon content on the mold surface will change.

When the vacuum furnace is quenched, the carbon content on the surface of the mold does not change, but if there is no partial pressure, some alloying elements will volatilize on the surface, affecting the alloy component content on the surface of the mold.

The landlord's problem may be divided into two times First, the advantages and disadvantages of the oil quenching furnace and the gas quenching furnace 1, under the conventional furnace type, under the same power, the adaptation surface of the oil furnace is wider than that of the gas quenching furnace, and the gas quenching furnace has a narrow application surface to the steel with large diameter and poor hardenability. 2. The cost of gas quenching is higher than that of oil quenching, which is due to the large consumption of nitrogen compared to oil, the longer working cycle, and the material frame and furnace components are more easily lost under frequent cold and heat exchange. 3. The gas quenching furnace with diffusion pump can be used for high-speed steel, beryllium copper, stainless steel, titanium alloy and other high-speed steel products, and can be used for vacuum tempering.

4. For steel with good hardenability, gas quenching is better than oil quenching, and the deformation and surface finish are also better. Conclusion: The gas quenching furnace is suitable for high-end products or special products, while the oil quenching furnace is more applicable and has lower production costs.

If it is a small heat treatment plant, it is recommended to purchase an oil quenching furnace for the first one, and air quenching is more suitable for subsequent purchase and façade decoration. Second, the cooling rate of gas quenching The brothers upstairs talked about the cooling rate of high-pressure gas quenching, and the domestic furnace can already achieve 10 bar, but Bishan can quench the large CR12 to HRC60, it is a question mark. However, 20 bar has been made in the world, and in the experiment of 40 bar, the high-pressure gas quenching of 20 bar is equivalent to the cooling speed of vacuum quenching oil in the static state, and the high-pressure gas quenching of 40 bar can be used to the cooling speed of vacuum quenching oil in the stirred state.

Yinyu is just from beginning to end, the cost of the vacuum furnace is not known to be much more expensive than oil?!

Specific problems are analyzed, gas quenching cooling is slow and deformation is small, and oil quenching is the opposite.

Different metals have different quenching methods, and it depends on what kind of metal it looks like.

Can CR12 be quenched with gas? How much hardness can be achieved after gas quenching.

Advantages: small amount of uniform deformation by heating, less oxidation and decarburization, fast heating, can quickly transform the internal structure of the workpiece, good thermal insulation performance and uniform heating performance, can be heated by solution treatment, wide applicability, can be shipped without oxidation, etc.

Disadvantages: the working environment is harsh, there is a certain corrosion to the workpiece, the service life is relatively short, the working space size and power are large, and the size is small. Moreover, waste salt is somewhat polluting to the environment, if the customer has higher requirements for non-oxidation, it can be considered, and the cost is general.

When used for a long time, due to the contact between the salt bath surface and the air; In addition, due to the oxides brought in by the workpiece, the effect of preventing oxidation and decarburization during the heating of the salt bath is gradually reduced, so the salt bath must be deoxidized periodically.

I am a high-speed steel tool, the same 6542 material can be used for more than 72 hours after quenching the product titanium in a salt bath furnace, and only about 24 hours after using a vacuum furnace for titanium, the effect is very obvious, I don't know why? If the vacuum furnace is good from the perspective of single quenching environmental protection, but it is not necessarily from the total point of view: salt bath furnace quenching speed * durability of the workpiece after quenching * pollution of the environment by vacuum furnace and vacuum furnace quenching speed * durability of workpiece after quenching * pollution of the environment by salt bath furnace, as well as more environmental pollution to upstream and downstream enterprises.

The investment is small, the heating is uniform, and the continuous production stability is high, but the pollution is heavier. Nowadays, the larger cities are not able to pass the environmental protection hurdle, and they are all in remote cities or rural areas.

The advantages of salt bath heat treatment are that the comprehensive heat exchange coefficient is large, the workpiece is heated quickly, the workpiece is in close contact with the bath liquid, the heating is uniform and the deformation is small. The heat capacity of the bath furnace is large, the heating temperature fluctuation is small, it is easy to maintain a neutral state, and it is easy to realize the heating without oxidation and decarburization, and it is easy to realize the local heating operation of the workpiece.

Of course, the biggest certainty of the salt bath furnace is that it causes certain pollution to the environment, and it is easy to cause occupational hazards to the human body of the operator. There is a trend of elimination, and some low-temperature salt bath furnaces have been replaced by quenching oil tanks.

The salt bath furnace is divided into external heating type and internal heating type, and now the internal heating salt bath furnace is quenched: high thermal efficiency, no thermal inertia, fast heating speed, uniform heating, easy operation, can prevent oxidation and decarburization, and the furnace temperature can rise to 1300 degrees. It is suitable for quenching and tempering heating of steel and liquid chemical heat treatment, especially for high-temperature quenching and heating.

Piston pins (including automobiles) are connected to the piston and the connecting rod, when in motion, it is equivalent to a double-point support beam, bearing asymmetric alternating load and a certain impact load, and its surface works under frictional conditions for a long time, and must have sufficient strength, toughness, friction resistance and fatigue limit. Generally, whether it is made in the form of bar stock, hot-rolled pipe, and pipe pulling, the piston pins are machined, carburized, quenched, tempered, and finished to become finished products. Therefore, salt bath quenching cannot be replaced by carburizing quenching, but the salt bath furnace can carry out carburizing process.

After the salt bath is quenched, it must be tempered!

Advantages of salt bath quenching:

1. The quenching heating time is short, the crystalline particles will not be coarse, and the toughness is strong, which is conducive to strain.

2. The furnace temperature is well distributed and the strain is reduced.

3. The cooling of the high-temperature area is fast, the cooling of the low-temperature area is relatively slow, the quenching is easy, and the strain is reduced.

4. It can cope with a wide range of heat treatment conditions (batch quenching, isothermal quenching, partial heat treatment, short-term heating, cooling, complex temperature changes, etc.).

5. Less oxidation and decarburization.

6. The adjustment of heat treatment temperature and time can be completed in a short time, and can correspond to multiple varieties and small batches.

7. The cost of equipment is relatively cheap.

There are two methods of salt bath heating: direct heat (electrode) type and external heat type. At high temperatures, an electrode type is heated by direct current in a salt bath. Medium and low temperatures are externally heated.

The external heating type is to add salt to a steel tank and then heat the tank. Temperature control is a bit difficult, but the advantage is that it can use a variety of energy sources such as steam and oil in addition to electricity.

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