Circular-arc tooth-shaped concave-convex anvil

Abstract

The invention relates to a circular-arc tooth-shaped concave-convex anvil which comprises an upper anvil body (1) and a lower anvil body (2). The circular-arc tooth-shaped concave-convex anvil is characterized in that the upper anvil body 1 comprises two circular-arc convex surfaces I which have the same radius R1 and are bulged from two side conical surfaces to the middle of the upper anvil body 1; the two circular-arc convex surfaces I with the same radius R1 are smoothly transitioned through a circular-arc curved surface I with a radius R2; the lower anvil body 2 comprises two circular-arc convex surfaces II which have the same radius R1 and are sunken from V-shaped conical surfaces to the middle of the lower anvil body 2; the two circular-arc convex surfaces II with the same radius R1 are smoothly transitioned through a circular-arc curved surface II with a radius R2; the two circular-arc convex surfaces with the same radius and the V-shaped conical surfaces are smoothly transitioned through the circular-arc curved surfaces with the radius R2; and an included angle between the two side conical surfaces and an included angle between the V-shaped conical surfaces are equal to each other and both set to alpha, wherein the value of alpha is 155 degrees. When the circular-arc tooth-shaped concave-convex anvil provided by the invention is adopted for forging, internal defects of a forge piece are overcome, the productivity is improved, the service life of the anvil is prolonged, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of forging, in particular to a type anvil for forging. Background technique [0002] The anvil shape used in the shaft forging process is one of the main process parameters that affect the stress and strain state in the plastic deformation zone of the forging billet. The elongation of conventional forging is to use flat anvils or upper flat and lower V-shaped or upper and lower V-shaped anvils Its deformation is characterized by the fact that the fiber direction formed after metal forming is basically parallel to the center line of the shaft, and the deformation in the deformation body is uneven after a single pressing, and there are difficult deformations in the contact with the upper and lower anvils. In the area, the mechanical properties of the longitudinal direction are higher than the mechanical properties of the transverse direction, so it is necessary to upsetting and elongating (forging ratio is lar...

AI Technical Summary

Problems solved by technology

Its technical scheme is as follows: a circular-arc-toothed convex-concave-shaped anvil, comprising an upper anvil 1 and a lower anvil 2, characterized in that the upper anvil 1 is set to protrude from the conical surfaces on both sides to the middle. Two arc convex surfaces of equal radius R1, the arc surface of radius R2 is smooth and transitional between the two arc convex surfaces of equal radius R1, and the lower anvil 2 is a V-shaped conical surface that is concave to a convex in the middle Two arc convex surfaces of equal radius R1, the arc surface of radius R2 is smoothly transitioned between the two arc convex surfaces of equal radius R1, and the gap between the two arc convex surfaces of equal radius and the V-shaped conical surface The arc surface of radius R2 is also smooth and transitional, and the angle between the two sides of the cone and the angle of the V-shaped cone are equal to α, and α can be changed within the range of 135° to 155°, especially the prominent two The conical surface and two convex convex surfaces with equal radius R1 in the middle make the transverse mechanical properties higher than forgings produced by conventional forging, can realize isotropic forging, and the ratio of transverse plasticity index value to axial plasticity can be equal to or greater than 1. Solved the production problem of shaft forgings with high requirements for transverse mechanical properties that has been unable to be solved for a long time, and the effect is very obvious

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