Method for predicting adiabatic shear sensitivity of pure copper and copper alloys using valence electron structure theory

Abstract

A method for predicting adiabatic shear sensitivity of pure copper and copper alloys using the valence electron structure theory is provided. The amount of energy required for producing an adiabatic shear band with the material performance parameters and strain rate as variables is used as an indicator for measuring adiabatic shear sensitivity; the relation between the valence electron structure parameters and copper alloy performance parameters is obtained using the valence electron structure theory; under the same cutting condition, the constitutive relation between alloying elements and adiabatic shear sensitivity is revealed in the electron structure level, the difficulty level of adiabatic shear phenomenon occurs in pure copper and copper alloys is predicted and basis is provided for designing materials with different adiabatic shear sensitivity; research results are helpful for further understanding the formation mechanism of the zigzag cutting adiabatic shear phenomenon, enriching the cutting theory and serving the high-speed cutting production practice.

Description

technical field [0001] The invention belongs to the technical field of high-speed cutting, and in particular relates to a method for predicting the adiabatic shear sensitivity of pure copper and copper alloys using the valence electron structure theory. Background technique [0002] High-speed cutting technology has become the development direction of cutting processing technology. In the process of high-speed cutting, the instantaneous high-speed impact between the tool and the workpiece makes the shearing limited to a small area, causing the temperature of the local area to rise sharply instantaneously, resulting in thermal softening, and forming zigzag chips evenly spaced by adiabatic shear bands. Such chips will affect chip control, processing quality, and accelerate tool wear. The higher the adiabatic shear sensitivity, the easier it is to produce zigzag chips, and the greater the impact on surface quality and tool wear. Under such extreme working conditions, the tradi...

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Problems solved by technology

At present, the degree of difficulty of adiabatic shear phenomenon cannot be well predicted, and its formation mechanism and influencing factors have yet to be clarified.

[0003] Throughout the research history of the adiabatic shear problem, most of the studies on the adiabatic shear sensitivity and its influencing factors focus on the comparative analysis of experiments, and the research on the influence of material performance parameters on the formation and development of the adiabatic shear band is generally the only one. Theoretically, it is difficult to break through the explanation of phenomena, and it is impossible to "predict" the occurrence of adiabatic shear phenomenon. Because the macroscopic properties of materials are mainly derived from their microscopic electronic structures, it is of great significance to study the properties of alloys and adiabatic shear phenomena from the electronic structure level. important meaning

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