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Dongguan Life-Style Casting Co.,Ltd

Address: Zhonghuiliyang Shidai, Dongcheng, Dongguan, Guangdong, China 523180

GeneralManager: Sherry Luo

Tel: 86-769-89865086

Mobile: 86-13712854626

Fax: 86-769-89865086

Whatsapp: 86-13712854626

E-mail: info@life-stylecasting.com

               sherryluo86@gmail.com 

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www.lifestylecasting.com

Inspection Procedures For Heat Treatment Of Silica Sol Investment Casting

Inspection procedures for heat treatment of silica sol investment casting
First, the silica sol investment casting heat treatment inspection procedures
Taking into account the valve silica sol investment casting shape complex, easy to deformation and cracking, silica sol investment casting heat treatment usually adopted annealing.
Inspection should focus on monitoring the supplier can follow the following heat treatment standards, and check the value of silica sol investment casting hardness.
1. Investment treatment heat treatment of the attention point
1.1 furnace temperature rose to 650 ℃ ~ 800 ℃, whether the slow warming
    As in the heating process, especially the complex shape of the silica sol investment casting, when the furnace temperature rose to 650 ℃ ~ 800 ℃, it should be slowly warming, or at this temperature for a period of time. As a result of this phase in the temperature of carbon steel phase change, with the volume change, resulting in phase-change stress, if the rapid warming, easy to casting thin-walled sector and thick-walled and outer and intermediate layer between the temperature difference Large, so that the thermal stress of the silica sol investment casting increases, easily lead to silica sol investment casting cracking.
1.2 insulation time can be sufficient
    In order to make the silica sol investment casting surface temperature equal, and there is sufficient time to make a complete change in the structure, thick-wall silica sol investment casting time than the thin-wall casting casting longer.
1.3 silica sol investment casting annealing, the same as the furnace with the usual cooling.
Second, the austenitic casting casting heat treatment inspection procedures
    Austenitic die casting heat treatment usually adopted solid solution and solidification treatment, so that it has the best corrosion resistance.
    Inspection should focus on monitoring the supplier can follow the following heat treatment standards.
1. Austenitic stainless steel solid solution
    The goal of the solid solution is to completely dissolve the carbides in the steel and obtain a single phase structure by heating the silica sol investment casting to 950 ° C to 1175 ° C. The heating method should be preheated at a high temperature and then heated to a solid Temperature of the process to reduce the heating process which the silica sol investment casting and the outside of the temperature difference between the temperature, the solidification and melting time is determined by the silica sol investment casting wall thickness, the usual wall thickness of each sister to maintain 2.5 ~ 3min calculation, Cross-section of the whole heat can be, after the melting of heat insulation into the water, oil or atmosphere, and to water is rare, the atmosphere is only suitable for thin-wall casting silica sol investment casting.
2. Austrian silica sol investment casting solidification treatment
    In order to avoid the "sensitization" phenomenon of Aogee casting, the alloying elements such as titanium and niobium are added to the steel, and then the solidification is carried out, and then the solidification treatment is carried out. The mold is heated from 850 ℃ to 930 ℃, After the insulation, so that the carbon in the steel and titanium, niobium combined to form a solid carbide.
silica sol investment casting refers to the use of forging processing methods and obtained pure aluminum or aluminum alloy device devices. Usually the use of sand mold or metal mold will be heated to liquid aluminum or aluminum alloy into the mold cavity, and access to a variety of shapes and sizes of aluminum machine or aluminum alloy machine is usually called aluminum die casting.
   1. Improve the silica sol investment casting structure plan to prevent sharp corners, wall thickness trying to smooth, smooth transition
2. To increase the sand (core) concessions measures
3. Ensure that the silica sol investment casting unit at the same time condensation or sequence condensation, improve the casting system design
4. Properly reduce the pouring temperature
5. Control the cooling time of the mold.