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The occurrence of cracks in the casting of hydraulic wrench forgings!Hollow hydraulic wrench
source:Industry News release time:2022-04-08 Article author:Rosit Popular:Air band saw
When the hydraulic wrench is forged and deformed, due to the low temperature or too fast deformation speed, and too fast cooling after forging, the softening caused by recrystallization may not keep up with the strengthening (hardening) caused by deformation, so that the interior of the forging after hot forging still remains. Part of the cold deformation structure is preserved. The existence of this structure increases the strength and hardness of the forging, but reduces the ductility and toughness. Severe chilling phenomenon may cause forging cracks.
Cracks are usually caused by large tensile stress, shear stress or additional tensile stress during forging. The part where the crack occurs is usually the part where the stress of the billet is relatively large and the thickness is relatively thin. If there are micro-cracks on the surface and inside of the billet, or there are structural defects in the billet, or improper hot working temperature reduces the plasticity of the material, or the deformation speed is too fast, the deformation degree is too large, and exceeds the allowable plasticity index of the material, etc. Cracks in hydraulic wrenches may occur in processes such as drawing, punching, reaming, bending and extrusion.
Crack: The crack of the hydraulic wrench is a shallow tortoise-like crack on the surface of the forging. Surfaces that are tensile stressed during forging forming (eg, underfilled bulges or bent portions) are more prone to such defects. The internal causes of cracking may be multi-faceted: for example, too many fusible elements such as raw materials, Cu, Sn, etc. When heated at high temperature for a long time, copper precipitation, coarse surface grains, decarburization, or multiple heating surfaces may occur on the surface of the steel. In addition, the sulfur content of the fuel is too high, and there is sulfur infiltration on the surface of the steel material.
Flash cracks: Flash cracks are cracks generated at the parting surface during die forging and trimming. The reason for the flash crack of the hydraulic wrench may be: in the die forging operation, the strong flow of the metal caused the piercing phenomenon. The trimming temperature of magnesium alloy die forgings is too low, and the trimming temperature of copper alloy die forgings is too high.
Parting surface cracks: Parting surface cracks refer to cracks generated along the parting surface of forgings. There are many non-metallic inclusions in the raw materials, and the hydraulic wrench flows to the parting surface during die forging and concentrates or shrinks the tube residue, which often forms parting surface cracks after the flash is squeezed during die forging.
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