Efficient forging method using curved-surface swage blocks

Abstract

The invention discloses a forging method capable of effectively forging void defects inside heavy forgings and improving the deformation non-uniformity of the surface layer of forging stocks and the core metal. The working surface of a curved-surface swage block adopted by the method is formed by smoothly connecting a side pressure surface (1) and a central cylindrical surface (2) which are symmetrical about the center line through an arc (3), wherein, the central cylindrical surface (2) of the curved-surface swage block can adopt an arc-type central cylindrical surface (C1) or a parabola- type central cylindrical surface (C2); the side pressure surface (1) can adopt a linear-type side pressure surface (C3) or an arc-type side pressure surface (C4); and the included angle alpha of the linear-type side pressure surface (C3) spans from 90 degrees to 180 degrees. The invention takes specific control over the metal deformation of the surface layer, the core part and the sub-surface of the forging stocks by adopting the side pressure surface (1) and the central cylindrical surface (2) of the curved-surface swage block, avoids large-area difficult deformation zones and core forging crack, forges the void defects inside the forgings with lower forging load, improves the deformation uniformity of the forgings and further improves the uniformity of structure properties inside the forgings, thereby realizing the efficient forging.

Description

technical field [0001] The invention relates to the technical field of metal plastic processing, in particular to a high-efficiency forging method for a curved anvil. Background technique [0002] Large-scale shaft forgings such as rolls and rotors are key components of major national equipment. Large-scale cast steel ingots are mostly used. The steel ingots are forged to the shape of the parts through the "upsetting + drawing" process, and the as-cast structure is crushed by pressure. Refined grain, uniform structure, defects such as shrinkage cavity, porosity and porosity inside the forged steel ingot. Flat anvil and V-shaped anvil are currently the most widely used anvil types in elongating forging methods, and there have been elongating methods such as upper and lower V-shaped anvils, upper flat anvils and lower V-shaped anvils, WHF method, and FM method. The above-mentioned elongation processes can produce different degrees of compaction effects in the core of the forg...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the serious non-uniform deformation problem that occurs when forging large-scale forgings by the existing elongation method, the present invention provides a new forging process for curved anvils. The anvil forging process can forge the surface and core hole defects of the forging with a small forging load, and the utilization rate of steel ingot and forging efficiency can be significantly improved

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