The solidification of the castingGuangdong Stainless Steel CastingIt is very important. Generally, the solidification method of castings is divided into two methods: layer-by-layer solidification and paste solidification according to the nature of the metal material; according to the casting structure, it is divided into two methods: sequential solidification and simultaneous solidification. Here I want to remind everyone that this layer-by-layer solidification and paste solidification are the properties of the material, and it is related to the solidification interval of the metal material, or in other words, the crystallization interval. The solidification zone refers to the area where the liquid and solid two phases coexist in the molten metal; this so-called crystallization interval is the temperature difference between the liquidus and the solidus of the molten metal. The so-called sequential solidification is to artificially change the order of its own solidification, so that the casting can be solidified in accordance with the process design requirements. First casting, then gate, finally riser, so that the shrinkage cavity in the casting is transferred to the riser, and then form a dense casting; while solidification is to adopt various methods to reduce the temperature difference of each part of the casting, so that each part of the casting is in the Solidified at the same time (regardless of its size and structure). This is the first point.

The second point, some people may understand that the material solidified layer by layer should adopt the principle of sequential solidification; while the paste solidified materialCoffee machine accessoriesThe material should adopt the principle of simultaneous solidification. Is this statement correct? No! This is what we said above. Layer-by-layer solidification and paste solidification are the properties of the metal material itself, you have no choice. If the customer has determined the material of the casting, this one means that he is already fixed. The sequential solidification and simultaneous solidification are determined by you, that is, the craftsman. I don't know if I said that you are not clear, but I think a considerable number of people have confused this issue, so it is necessary to repeat it here. In other words, castings designed with materials solidified layer by layer can adopt the principle of simultaneous solidification according to the structure; castings designed with materials solidified in paste form can adopt the principle of sequential solidification.

The third point, under normal circumstances, gray iron, low carbon steel, industrial copper, aluminum, and aluminum-silicon alloys are all solidified materials layer by layer. Nodular cast iron, high-carbon steel, aluminum-copper alloy, aluminum-magnesium alloy, magnesium alloy, etc. are all pasty solidification methods. There is another problem that needs everyone to pay attention to, that is, the temperature difference of the casting section, or the temperature gradient. When the temperature gradient is large,Robot stainless steel accessoriesPaste solidified materials may also become solidified layer by layer.