One-step forming forging mould of elongated forging with upsetting ratio bigger than 3

Abstract

The invention discloses a stamp forging mould of long and thin forging with upsetting rate more than 3, which comprises an upper die and a lower die, wherein a punch of the upper die is just opposite to a die orifice of the lower die, and is characterized in that the outer circle of the punch is provided with a movable protection jacket, an inner hole of the protection jacket is in slide fit with the outer circle of the punch, the protection jacket is connected with the upper die through an elastic device, and the lower end surface of the protection jacket can be smoothly and closely attached to the plane on which the die orifice of the lower die is arranged when the lower end surface is contacted with the plane. The stamp forging mould adopts a near-net-shape technology; the produced forge piece is basically free from generating rough selvedge, and the utilization rate of the material can reach 99.5 percent, so not only the raw material can be saved, but also the forge piece can be obtained directly through the cold deformation, and the energy can be saved. The technical scheme breaks through the restriction of the one-time forge formation that the upsetting ratio cannot be more than 3. The service life of the mould is long.

Description

technical field [0001] The invention relates to a primary forming die forging die for a slender forging with an upset ratio greater than 3. Background technique [0002] For forging some slender parts, such as a high-load on-off electrical connector used in power distribution cabinets, the material is T2 copper, which requires high dimensional accuracy, and no cracks, folds, scratches, bumps and other surface defects are allowed on the surface . If the ordinary open die forging process is adopted, the raw material utilization rate is low, the surface may be folded and the dimension in the thickness direction is unstable; if the ordinary open upsetting process is adopted, the blank exposed outside the lower mold cavity will follow the upper die Move down, resulting in severe bending, especially for forgings with an upsetting ratio greater than 3 (the upsetting ratio refers to the ratio of the length of the bar exposed outside the cavity of the lower die to the diameter of th...

AI Technical Summary

Problems solved by technology

If the ordinary open die forging process is adopted, the raw material utilization rate is low, the surface may be folded and the dimension in the thickness direction is unstable; if the ordinary open upsetting process is adopted, the blank exposed outside the lower mold cavity will follow the upper die Move down, resulting in severe bending, especially for forgings with an upsetting ratio greater than 3 (the upsetting ratio refers to the ratio of the length of the bar exposed outside the cavity of the lower die to the diameter of the bar), it is necessary to use multiple upsetting processes. Carry out forging molding, otherwise the bar will be severely bent during molding deformation, resulting in molding failure

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