Flash crack of forged flange
The flash crack of forged flange is the crack at the parting surface during die forging and trimming. The reasons for the flash cracks of forged flanges may be: ① in the die forging operation of forged flanges, the strong flow of metal caused by heavy blows leads to the phenomenon of reinforcement penetration. ② The trimming temperature of magnesium alloy die forged flange is too low; The trimming temperature of copper alloy die forgings is too high.
Crack on parting surface of forged flange
The crack on the forging parting surface of forged flange refers to the crack along the forging parting surface. There are many non-metallic inclusions in raw materials, and the forging flange flows and concentrates to the parting surface during die forging, or the residual pipe shrinkage is squeezed into the flash during die forging, and then the die surface cracks are formed.
Folding of forged flanges
The forging folding of forged flange is formed by the confluence of the oxidized surface metal in the process of metal deformation. It can be formed by the confluence of two (or more) metal convection; It can also be formed by the rapid flow of a large amount of metal, which brings the surface metal of the forged flange of the adjacent part with the flow, and the combination of the two; It can also be formed by bending and reflow of deformed metal; It can also be formed by local deformation of part of the metal and being pressed into another part of the metal. Folding is related to the shape of raw materials and blanks of forged flanges, the design of dies, the arrangement of forming procedures, lubrication and the actual operation of forging.
