1. Metal materials
The metal materials of precision casting companies mainly come from purchased materials, waste castings of the company, and pouring risers. The purchased metal materials are often in bulk, rarely pressed into a cylindrical shape, and materials of different materials are easy to mix together, such as 316 materials mixed with 304 or 430 materials. Therefore, precision casting companies should choose to purchase materials that are pressed into a cylindrical shape as much as possible. The chemical composition of each batch of purchased materials is analyzed with a spectrum analyzer. If possible, the supplier should conduct on-site inspections to evaluate whether the materials are labeled, protected, and stored in isolation.
The scrap steel (waste castings, pouring risers) of this enterprise shall be treated with rust removal, degreasing, sand removal and cleaning and drying, and the S and P components shall be controlled. In addition, scrap steel of different materials should be marked, protected, and stored separately, and should not be confused.
2. Mold material
The performance indicators of the mold material mainly include: melting temperature and solidification temperature range, heat resistance, thermal expansion and shrinkage, strength, hardness, viscosity, fluidity, coating and ash content, etc. It is difficult for general precision casting companies to inspect these performance indicators one by one. Therefore, when choosing a supplier, we should choose some formal enterprises with a relatively complete quality management system as much as possible, and strictly evaluate and confirm the supplier. However, as one of the most important performance indicators of the mold material-the shrinkage rate, it can be tested. The shrinkage rate directly affects the dimensional accuracy of the casting and the quality of the shell. At present, the domestic method for measuring the linear shrinkage rate of the round cake sample does not consider the influence of the wax mold structure on the shrinkage rate. It is better to refer to the foreign stepped sample method to be closer to the actual situation.
3. Silica sol
The physical and chemical parameters of silica sol mainly include: SiO2 content, density, Na2O content, PH value, kinematic viscosity, colloidal particle diameter, etc. These physical and chemical parameters mainly affect the strength of the shell, the stability of the coating, and the powder-to-liquid ratio of the coating. Since it is difficult for general precision casting companies to detect these physical and chemical parameters, on the one hand, it is necessary to strengthen the selection, evaluation and confirmation of suppliers; on the other hand, the surface layer and the back layer should choose to use different specifications of silica sol, such as surface layer. Select S-830 silica sol for the layer and S-1430 silica sol for the back layer.
4. Surface coating
Precision casting companies generally choose zircon powder as the surface coating. When the zircon powder contains oxide impurities, the decomposition temperature will drop, and amorphous SiO2 will be precipitated, which will chemically react with certain elements in the metal, causing defects such as "pitting" on the surface of the casting, and deteriorating the surface quality of the casting. Moreover, the particle size and distribution of zircon powder also have a direct effect on the powder-to-liquid ratio of the coating. Therefore, the selection of suppliers should be strictly controlled. After use, it has been shown that the quality of Australian zirconium powder is relatively good.
The company is a medium-sized private enterprise integrating casting and machining.
The company is located in Dikeng Village, Dongguan City, Guangdong Province, and was founded in the late 1990s. Through years of technological innovation and reform, as well as the continuous accumulation of talents in casting and processing, we now have a complete machinery manufacturing organization and strong financial strength.
The company’s existing plant area is more than 18,000 square meters, fixed assets of 20 million yuan, hundreds of professional and technical personnel, 4 foundry workshops (lost foam, large parts, machine die, copper and aluminum casting), and 4 processing workshops (CNC, Oil pressure, follow-up, spray painting), sand-finishing products and processed parts can be separated. Externally, from 2009 to 10 years, the annual casting output exceeded 8,000 tons, the processing output exceeded 6,500 tons, and the tax revenue was 10,000 yuan.
This article is from: Dongguan Zhanpeng Hardware Products Co., Ltd.     Website: en. zhanpengzz.com


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