1、 Casting
The forging method should be used to manufacture the parts with complex forms. At present, most castings are forged by sand mold, which can be divided into wood mold manual type and metal mold mechanical type. It has low precision, large machining surface allowance and low production efficiency. It can be used for single small batch production or forging of large parts. Metal mold machinery has high production rate and casting precision, but the cost of equipment is high and the component of casting is limited, so it can be used in a large number of small and medium-sized castings. Secondly, special forging can be selected for small castings with high quality requirements, such as pressure forging, centrifugal manufacturing and investment forging.
2、 Forging
For steel parts with high mechanical strength requirements, forging blanks are usually used. There are two kinds of Forgings: free forging and die forging. The free forging forging can be obtained by hand forging (small blank), mechanical hammer forging (medium blank) or press forging (large blank). This kind of forging has the advantages of low precision, low production rate, large machining allowance, and simple structure. It is applicable to single piece and small batch production, and large forgings.
The small braid in the well-organized parts processing field tells you that the accuracy and surface quality of die forgings are better than that of free forgings, and the form of forgings can be more complex, so the machining allowance can be reduced. The production efficiency of die forging is much higher than that of free forging, but it needs unique equipment and forging die, so it is used for large batch of medium and small forgings.
3、 Profile
Profiles can be divided into round steel, square steel, hexagonal steel, flat steel, angle steel, channel steel, I-beam and other profiles with unique sections. There are hot rolled and cold drawn sections. The hot-rolled profile has low precision but low value, which is used for the blank of common parts; the cold drawn profile has small size and high precision, which is easy to complete the automatic feeding, but it has high value, which is mostly used for the production of large batch, and it is practical for the processing of self-propelled bed.
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