Bimetallic copper sleeve is a common mechanical accesso […]
Bimetallic copper sleeve is a common mechanical accessory, which has a wide range of applications. In order to ensure its good performance, we need to pay attention to the following details when we process it:
1. Pure copper sleeve requires high conductivity and thermal conductivity, but as long as there are trace impurities in bimetallic copper sleeve, such as: Mn, P, etc., its conductivity and thermal conductivity will be significantly reduced. Therefore, the limit of impurity content is very strict when melting and casting pure copper. For furnace charge, melting equipment and tools, attention should be paid to "three impossibilities", that is, not to use iron tools, not to use crucibles that have melted other copper alloys, not to use contaminated recycled materials.
2. When casting bimetal copper sleeve, do not stir too much. Aluminum has high affinity with oxygen, which is easy to oxidize to form suspended oxide slag and form optical oxide film on the liquid surface. The oxide film on the surface of molten pool can be used to protect the inner liquid copper without additional covering agent. The liquid copper should not be stirred excessively to keep the oxide film on the liquid surface from being damaged.
3. When casting tin, there is no need to add other precipitation oxidant. Bimetallic copper sleeve processing, need to have a good inspiratory, in order to reduce the inspiratory, can be in the weak oxidizing or oxidizing atmosphere, and under the protection of covering agent for rapid melting, but because the alloy contains a certain amount of zinc and phosphorus and other elements, the alloy liquid deoxidation, so do not need to add other precipitation deoxidizer in the melting process.