Application of Extreme Vertices Design in Matrix Formula Experiment for Hot Pressing Diamond Tools

摘要

Matrix formula experiment is an important content in the research of hot pressing diamond tools. The experiment of iron-based matrix formula was conducted based on extreme vertices design of mixture regression. Iron mass percentage, phosphorus mass percentage, nickel mass percentage and cobalt mass percentage were selected as four factors of experiment. Rockwell hardness (HRB value) of matrix was used as experiment index, and regression model of four factors quadratic polynomial was applied. The coefficients of regression equation were solved by "Regression" tool in Excel. Optimum matrix formula, corresponding to the highest hardness forecast, was solved by "Solver" tool in Excel. Calculation result showed that when matrix formula was: Fe 48.5wt.%, P 2.5wt.%, Ni 8wt.%, Co 8.0wt.%, the matrix had the highest hardness (HRB117.8). Proving trial indicated the experiment result agreed well with the forecast value of regression, which showed that the application of extreme vertices design in matrix formula experiment of hot pressing diamond tools is reasonable and reliable.