Energy-saving skills for heat treatment of induction furnaces

1. Heat treatment process of induction heating furnace: In the traditional process calculation time: T=K×A×D is the heating time, K is the furnace loading coefficient, A is the heating coefficient, D is the useful thickness of the workpiece, in fact, we are In practice, it is generally based on past work experience and useful thickness of the workpiece to calculate the holding time. In large quantities, it is based on practical experience or observation of the fire color of the workpiece. This is mainly reflected in carbon steel and low alloy steel. Carbon steel has no alloying elements and carbides, and does not require long-term thermal insulation to maintain austenitizing. Low-alloy steel has a heat transfer coefficient similar to that of carbon steel, so the moment of heat transfer of the workpiece is mainly determined by its useful scale. When the temperature of the workpiece has reached the process set value, When the surface of the workpiece has reached the process temperature value, the workpiece has been sterilized. Do not add additional insulation time. This is what we often call “zero” insulation heating. When it comes to mass production, we usually heat the furnace first, then put it into the workpiece after the temperature, and when the furnace temperature reaches the process time again, add a certain homogenization time, which can shorten the process cycle relatively, save energy and reduce capital.

Alloy structural steel (40CR, 35CRMO, 42CRMO), etc., because of the addition of some alloying elements in the material, it is necessary to make the need for homogenization of carbides in the heating process, so it is a little more than carbon steel. At the moment, it is generally about 60%-80% of the time of the traditional process. This can shorten the time when the steel is heated at a high temperature, and the amount of deformation is also relatively reduced. The austenite grains are relatively fine, and the quenching can be subtle. The martensitic arrangement has a certain improvement in its mechanical properties, which is what the heat treatment workers want to achieve.

2, parts loading furnace 1): In practice production, when the number of workpieces is limited, it is not cost-effective to arrange the furnace separately. Under this condition, different workpieces and different materials can be roughly the same in their process parameters. In the same situation, it is possible to mix a furnace, such as CR12MOV with 8407 or H13, 40CR and 42CRMO are also the same. The quenching temperature is about the same, so that the furnace capacity can be satisfied. Similarly, when the tempering temperature is the same, different parts and different materials can be mixed together, and the tempering time can be performed according to the long tempering time. . 2): heat treatment fixtures, many products are not nearly the same, and the amount is not many, but in order to reduce the amount of deformation, sometimes in the addition of heat treatment tooling, many times do not use heat-resistant stainless steel, most have ordinary low-carbon steel replacement, mainly materials The price is low, and there are not many.

3. Heat treatment cooling medium Many mechanical parts are alloy structural steels. Therefore, when considering quenching medium, the aqueous solution is selected. The quenching of the aqueous solution prevents the hardness of the large-diameter medium-carbon low-alloy steel from being hardened by heat treatment. Easy to crack, water-soluble quenching liquid is especially suitable for low, medium carbon steel induction and large part quenching. Water-soluble quenching liquid is especially suitable for low, medium carbon steel induction and large part quenching. Different cooling speeds, quenching the workpiece bright light and short-term anti-rust effect, can be directly tempered without cleaning, no fumes. No oil smoke, no burning, no fire risk, improve the working environment. It is not easy to age, change, and has a long service life, which is related to oil. The cost is also relatively small.

4, tempering process tempering process is based on the tempering temperature of the part to determine the furnace residual heat to be used, the general rule is that the part tempering temperature is lower than the furnace residual heat temperature of about 300 degrees, so that the furnace quickly arrives after the workpiece enters the furnace The tempering process temperature setting value, as well as repeated tempering is better than a tempering, so the second tempering in the mass production is better than a tempering, and the cost is also reduced accordingly.

5, equipment maintenance and maintenance In the production of regular maintenance equipment, check the furnace, the sealing of the furnace door. The instrumentation and instrumentation related to the distribution box should be regularly calibrated and maintained to reduce the loss caused by the shutdown caused by the electrical fault. Each relevant operating device, such as a trolley, maintains the loss caused by the inconvenience of entering and leaving the furnace.

6. Control of heat treatment quality In fact, when the workpiece is heat-treated, it is energy-saving. If a workpiece has not been subjected to reasonable and reasonable heat treatment, the time limit of the operation of the part will not be long. It is necessary to manufacture new parts in the early stage of the failure of the part. Parts are replaced, which in turn will consume raw materials and machining time, and other related costs. A reasonable heat treatment can increase the service life of the workpiece by a multiple. Therefore, the quality of the heat treatment can prevent the failure of the workpiece in the early stage, and can prevent the workpiece from heat treatment and rework (normalizing, re-quenching, proofing, de-stressing and tempering) and other procedures. The energy-saving skills of the heat treatment of the intermediate frequency melting furnace are unmatched.

For more information about the intermediate frequency electric furnace, diathermy furnace and induction furnace of Kunshan Wantai Electric Furnace Co., Ltd., please contact Xiaobian.