The production process is mainly divided into forging, casting, cutting, rolling these four kinds.
(1) Casting flange and forging flange
Casting out of the flange, blank shape size is accurate, processing amount is small, low cost, but there are casting defects (pores. Crack. Inclusion); The internal structure of the casting is less streamlined (if it is a cutting part, the streamline is worse);
The forged flange is generally less carbon than the casting flange is not easy to rust, the forging is streamlined, the organization is dense, the mechanical properties are better than the casting flange;
Improper forging process will also appear large or uneven grain, hardening crack phenomenon, forging cost is higher than casting flange.
Forgings can withstand higher shear and tensile forces than castings.
The advantage of casting is that it can produce a more complex shape and the cost is relatively low;
The advantage of forging is that the internal organization is uniform, there is no porosity in the casting, inclusion and other harmful defects;
The forging process is generally composed of the following procedures, that is, the selection of fine billet feeding, heating, forming, forging cooling. The forging process includes free forging, die forging and membrane forging. Production, according to the size of the quality of the forging, the number of production batch choose different forging methods.
Free forging has low productivity, large processing allowance, but simple tools and large versatility, so it is widely used in forging simple shape of single piece, small batch production of forgings. Free forging equipment includes air hammer, steam - air hammer and hydraulic press, which are suitable for small, medium and large forging production respectively. Die forging has high productivity, simple operation, easy to realize mechanization and automation. The die forging parts have high dimensional precision, small machining allowance, and more reasonable distribution of fiber structure, which can further improve the service life of parts.
(1) The basic process of free forging: In free forging, the shape of the forging is gradually forged into the blank through some basic deformation procedures. The basic processes of free forging include upsetting, drawing, punching, bending and cutting.
(2) die forging
Die forging is called model forging. The heated blank is placed in the forging die fixed on the die forging equipment.
(3) cutting flange
The disc with the inner and outer diameter and thickness of the flange is directly cut out on the middle plate, and then the bolt hole and water line are processed. The flange produced in this way is called cut flange, this kind of flange large diameter to the width of the plate is limited.
(4) winding flange
The process of cutting a strip from a medium plate and then winding it into a round is called winding, which is used in the production of some large flanges. After successful winding, welding is performed, then flattening is performed, and the waterline and bolt holes are processed.
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