Forging strengthening and shaping process for nodular iron castings

Abstract

The invention discloses a forging strengthening and shaping process for nodular iron castings. The forging strengthening and shaping process for the nodular iron castings comprises the following stepsthat the cast nodular iron castings are heated to the temperature of 800 DEG C or above, forging strengthening and shaping with the deformation not lower than 1% and not larger than 15% is conductedin a closed forging die sprayed with a release agent, a nodular iron casting part blank is obtained through a casting process, a forging process is used for carrying out final near-net shaping on thepart blank, the machining cost can be reduced, the nodular cast iron part can be further compactly reinforced, internal defects are eliminated, by reasonably controlling the forging deformation amountand release agent components, it is guaranteed that spherical graphite inside the nodular cast iron part does not deform, the surface nodular cast iron structure does not degrade, at a higher forgingtemperature, the internal performance is not reduced, and the surface strength and corrosion resistance are not reduced.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a forging strengthening and setting process for ductile iron castings. Background technique [0002] Ductile iron is a high-strength cast iron material with higher strength than carbon steel. Therefore, casting is generally used to produce ductile iron parts in industry. However, the shape accuracy and dimensional accuracy of the products manufactured by the casting process are low, and the casting process control is complex. Casting Products generally have unavoidable defects, mainly shrinkage cavities, shrinkage porosity, etc., which affect the yield of castings. [0003] The forging process is to use forging pressure processing equipment to apply pressure to the metal blank to cause plastic deformation to obtain forgings with a certain shape and size. In forging, the internal defects of the product are eliminated, the grains are refined, and the mechanical properties are impro...

AI Technical Summary

Problems solved by technology

[0002] Ductile iron is a high-strength cast iron material with higher strength than carbon steel. Therefore, casting is generally used to produce ductile iron parts in industry. However, the shape accuracy and dimensional accuracy of the products manufactured by the casting process are low, and the casting process control is complex. Casting Products generally have unavoidable defects, mainly shrinkage cavities, shrinkage porosity, etc., which affect the casting yield

[0003] The forging process is to use forging pressure processing equipment to apply pressure to the metal blank to cause plastic deformation to obtain forgings with a certain shape and size. In forging, the internal defects of the product are eliminated, the grains are refined, and the mechanical properties are improved. It has been improved, but if the forging process is used to manufacture ductile iron parts, the requirements for equipment and molds are very high, especially for some large and complex structural parts, the forging process is basically not feasible