易切削结构钢中非金属夹杂物与切削性能的相关性

The Correlation between Non-metallic Inclusions and Machinability in Free Cutting Structure Steels

摘要: 本文以钙硫系易切削结构钢为主要研究对象,借助于定量图像分析仪、电子探针、扫描电镜等仪器和设备,探讨了钢中非金属夹杂物与钢切削性能的相关性。研究钢中非金属夹杂物尺寸对刀具寿命的影响,结果表明:本试验条件下夹杂物对刀具寿命的临界影响尺寸为8μm。还研究了非金属夹杂物的间距、均匀性及数量对刀具寿命的影响。
最后,建立了描述非金属夹杂物特征参数与刀具寿命关系的数学模型。
试验表明,刀具寿命（T）主要受钢中非金属夹杂物有效颗粒数（Ne）和分布均匀度（H）的影响。

Abstract: By using the quantitative image analyzer, EPMA, SEM et al, the effects of the size, inter-distance, homogeneity and number of non-metallic inclusions mainly in Ca-S free cutting structure steel on tool life were studied.The results show that the critical length of non-metallic was 8 μm under this experimental conditions.
A mathematical model describing the relation between the parameters of non-metallic inclusions and tool life was set up:
T=α·Hβ·Ne^γ
According to the model, the tool life(T) dePends mainly on effective number(Ne) and homogeneity(H) of non-metallic inclusions in steels.