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The gating system is used to guide molten metal into the die cavity. Whether the design of gating system is reasonable or not has a great influence on the quality of castings. It is easy to cause various casting defects, such as inadequate casting, cold separation, sand washing, slag inclusions, inclusions, sand inclusions and other casting defects. The design of gating system includes the selection of gating type system, the selection of gate position, and the determination of cross-sectional dimensions of the components of gate control system. In addition, the choice of gating system is also very important, so how do we choose the appropriate gating system?

The key is that carbon exists in the form of cast iron. Carbon in gray cast iron exists in free flake graphite, which has a great influence on the weakening of matrix. Malleable cast iron is better than malleable cast iron. Carbon exists in the form of flocculating graphite, but in spherical graphite. In cast iron, carbon exists in the form of spherical graphite, which has little effect on the weakening of matrix and higher mechanical properties. Due to the extremely low fracture sensitivity of ductile iron, high mechanical properties are directly formed.

Organizational differences lead to significant differences in performance: Gray cast iron is a kind of flake graphite split matrix, which is easy to cause stress concentration, brittleness and good vibration reduction performance. It is mainly used to produce all kinds of high strength cabinets/bases that do not need to bear compressive stress.

Produced. Porosity is due to the insufficient permeability of the casting mould (core) and the large amount of gas produced during pouring, which can not be discharged in time.Produced. Porosity is due to the insufficient permeability of the casting mould (core) and the large amount of gas produced during pouring, which can not be discharged in time. 1) Identification of Shrinkage Shrinkage holes in castings are characterized by rough hole walls and irregular shapes, which often occur at the thicker part of the final solidification of the castings or at the junction of the casting walls. The main methods for identifying shrinkage are as follows:

Ductile iron is carbon containing iron. We know that iron or steel contains a certain amount of carbon. Why is it called ductile iron? This is because they contain different forms of carbon. Ductile iron contains spherical carbon, so it has more stable properties.

It is an effective measure to prevent shrinkage and porosity by setting risers at the thick wall and hot spot (i.e. the parts with concentrated heat on the casting and larger diameter of inner circle). The size of riser should ensure that the riser solidifies later than the parts to be compensated by it, and there is enough liquid metal supply. A "sequential solidification principle" is adopted to establish a riser on the casting. The temperature gradient gradually increases from the part far from the riser to the riser, thus realizing the sequential solidification from the part far from the riser to the riser, that is, the part far from the riser first solidifies, the part near the riser then solidifies, and the riser itself finally solidifies.

Technology and method of casting production by using casting theory and system knowledge. Including casting technology, casting system, feed system, ventilation, cooling system, special casting technology, etc. Foundry process design includes: design of foundry process drawing, design of foundry draw