A kind of microwave dewaxing method and microwave dewaxing furnace

Abstract

The invention belongs to the technical field of investment casting and discloses a microwave dewaxing method. The microwave dewaxing method comprises the following steps: automatically weighing a to-be-dewaxed shell mold; calculating microwave output power, microwave output time and total dewaxing time according to the weight of the shell mold and performing microwave dewaxing; heating the shell mold to the temperature of 110 to 130 DEG C and / or heating the shell mold by using a hot air and / or infrared way after a fluid is formed between the shell mold and wax, maintaining the temperature of the shell mold to be 110 to 130 DEG C; taking out the shell mold and recycling wax liquid after the wax in the shell mold is totally removed. The invention also discloses a microwave dewaxing furnace; the microwave dewaxing furnace comprises a shell provided with a furnace door; the shell is provided with an energy release opening and a hot air circulating heating device which are connected with a microwave generator; the microwave generator and the hot air circulating heating device are both connected with a controller; the controller is connected with a switch. The microwave dewaxing method and the microwave dewaxing furnace disclosed by the invention are capable of solving the problems that a dewaxing device in the prior art easily causes cracking of the shell and the wax liquid is large in water content.

Description

Technical field [0001] The present invention belongs to the field of molten casting, and a microwave dewaxing method having a good dewaxing effect and a long service life and low failure rate. Background technique [0002] At present, there is a high-pressure 0.8 MPa steam to remove the wax mold in the case of 0.8 MPa steam, and the steam source is a fuel boiler or an electric boiler, and the steam is removed. In order to remove waxes, the shell does not crack, and usually need to warm the deesed kik to 150 ° C to work, so it must consume a lot of energy. The temperature in the dewaxing is high after loading the mold, if the mold case will be tapped by the temperature rise of the wax mold, which affects the quality of the casting. Usually, the process requires that the mold has reached 0.4 MPa within 14 seconds, and the intermediate is closed, open the steam valve, and pressurize three processes, time is very compact. Therefore, many factories often have a swelling blade. The ste...

AI Technical Summary

Problems solved by technology

[0005] (1) The microwave generator adopts a single high-power microwave generator. In order to achieve actual production, a power of more than 90KW is required. There is no such a high-power single microwave generator in China, and there are foreign countries, but the cost is quite high (about 1 million yuan a set (It will be very expensive to apply it to the equipment, which is not conducive to the actual promotion of production

[0006] (2) Since the microwave generator has a life limit, generally 20,000 hours, the power attenuation will be very severe after exceeding the limit, resulting in insufficient power of the equipment and affecting the quality of dewaxing

20,000 hours in the factory production, the two-shift working mode will reach the service life of the generator in two years at most, and it is unrealistic to replace such expensive parts every two years in the reproduction

[0007] (3) When the wax liquid flows out through the lower side of the metal chamber, it must remain on the metal wall. In the high-energy-density metal chamber, it will be quickly carbonized and become a conductor, which will be ignited and burned. In severe cases, the electronic ignition will burn back the inner cavity microwave Generators and dewaxing trolleys and other internal components, resulting in complete equipment damage

[0008] (4) In the actual dewaxing production, the size and weight of the shell mold are different, that is, the load entering the microwave chamber is different every time. If only a fixed power is used for dewaxing, when the load is too small, the energy density in the chamber will be too high Without load absorption, a lightning-like ignition phenomenon will be formed, and in serious cases, the magnetron will be directly burned

[0009] (5) The microwave emitted by a single microwave launch port has a single mode and a single propagation direction in the chamber, so the heating is uneven, which will cause uneven heating of the shell mold and cracks, resulting in dewaxing failure

Images