In the process of using tin bronze castings, it mainly refers to the equipment and equipment of pure copper or copper alloy obtained by the method of casting. The energy saving produced by copper castings is mainly energy saving, followed by water saving. In the copper alloy casting, the metal casting method is used to accelerate the condensation of the alloy, which plays an important role in improving the quality of copper castings and reducing casting defects.
The characteristics of copper castings: the appearance of copper parts is prone to water ripples and noise; if the copper parts contain elements that are easy to cut such as sulfur, it will affect the machinability of the copper parts. The resistance and plasticity of copper parts are relatively large, and the deformation during cutting is also large; the expansion coefficient of pure copper is large, and deformation will occur due to the influence of high temperature when cutting, so the size and accuracy of copper parts are difficult to process. Master; in the process of Hebei tin bronze processing, the chips may stick to the blade, which will affect the quality of copper processing, and will affect the service life of the tool.
1. Removal of colored mottles on copper castings: Mottles that are different from the base metal appearing on the surface of copper castings are generally composed of paint carbides. Cause: The coating is impure or the amount is too much; Tuchai contains too much graphite. Cleaning method: The coating should be thin and uniform in application, and should not be piled up. It should be blown away with compressed air; reduce the graphite content in the coating or use graphite-free water-based coatings.
2. Hemp surface of copper casting: Because the mold temperature or alloy liquid temperature is too low during the filling process, the surface of the copper casting forms a small pit-like scattered area under the condition of approximate underpressure. Cause: The metal is dispersed into dense droplets during filling, hitting the shaped wall at high speed; the thickness of the inner gate is too small. Cleaning method: correctly design the pouring system, prevent the molten metal from splashing, improve the exhaust conditions, prevent the liquid flow from getting too much gas, reduce the speed of the inner gate and increase the temperature of the Hebei tin bronze mold; adjust the thickness of the inner gate appropriately.
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