Preparation method for semi-solid state blank of steel

Abstract

The invention discloses a preparation method for semi-solid state blank of steel. The preparation method comprises the following steps of: 1) heating a high-temperature resistance furnace to 1100-1200 DEG C, and putting blank which precisely drops into the high-temperature resistance furnace to heat and preserve heat; 2) clamping blank onto a lower cutting board of a forging hammer, upsetting in the axial direction of the blank for enabling the blank to reach set deformation amount; 3) after upsetting, drawing the blank to the initial size; 4) repeating steps 2) and 3) within the range of a forging temperature, quickly cooling the blank to the room temperature; and 5) rising the furnace temperature of the high-temperature resistance furnace to a semi-solid state temperature being 1250-1450 DEG C of steel, and putting the blank to heat and perverse heat, thereby obtaining semi-solid state blank of steel. Semi-solid state blank prepared by the preparation method can be directly subjected to semi-solid state forging formation, so that a secondary heating process is avoided, a blank making mould does not need to manufacture, process flow is shortened, operations are simple, efficiency is high and cost is high.

Description

technical field [0001] The invention relates to a method for preparing a semi-solid blank of steel, belonging to the field of semi-solid blank preparation. Background technique [0002] In the 1970s, Flemings et al. proposed the metal semi-solid forming technology (Semi-Solid Mental Forming Processes, SSM). Compared with the conventional metal forming process, metal semi-solid forming has many advantages. It can be formed at a higher speed to obtain complex metal parts with good internal structure and high dimensional accuracy. It is called by experts as one of the key technologies for emerging metal manufacturing in the 21st century. 1. The preparation of a semi-solid billet with a uniform and fine equiaxed non-dendritic structure, a high solid phase ratio (easy to clamp), and a relatively low shear flow stress (easy to fill) is a metal semi-solid The basis and key of thixoforming is also an important subject in the research field of semi-solid forming. [0003] At presen...

AI Technical Summary

Problems solved by technology

[0005] When conventional methods such as upsetting and extrusion prepare semi-solid billets, there are disadvantages such as small deformation and uneven deformation, which finally lead to low spheroidization rate and uneven grain size of the prepared semi-solid billet.

New methods such as equal-diameter angular extrusion and die forging have a large amount of deformation, but need to manufacture molds, which increases the cost and requires high equipment requirements; and is mostly used for the preparation of semi-solid billets of low-melting point alloys such as aluminum and magnesium.

However, for high melting point alloy materials such as steel, the preparation of its semi-solid blank will be more difficult

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