高速铣削45钢工件硬度对切削力及表面粗糙度影响的试验研究

通过对45钢高速铣削试验,研究了工件材料硬度对切削力以及工件表面粗糙度的影响趋势。结果表明,当工件硬度低于HRC50时,随工件硬度的增大,切削力减小、表面粗糙度增大;而工件硬度高于HRC50时,随着工件硬度的增加,切削力增大,表面粗糙度值减小。提出了切削硬度的概念,揭示了切削过程中材料硬度的变化机理,对以上影响规律进行了合理的解释,同时对工件硬度、切削温度、粗糙度、切削力之间的内在相互作用进行了分析。

CUTTING TEMPERATURE MEASUREMENT IN HIGH-SPEED END MILLING

A computer aided measurement system is used to measure the cutting temperature directly in high-speed machining by natural thermocouples and standard thermocouples. In this system the tool/workpiece interface temperature is measured by the tool/workpiece natural thermocouple, while the temperature distribution on the workpiece surface and that of interior are measured by some standard thermocouples prearranged at proper positions. The system can be used to measure cutting temperature in the machining with the rotary cutting tools, such as vertical drill and end milling cutter. It is practically used for the research on high-speed milling with hardened steel.

高韧性复合陶瓷刀具新材料

本项目研制了NC70M及CM55两种新型陶瓷刀具材料。活化金属粘结的Al2O3+Ti（C、N）复合陶瓷NC70M在抗弯强度高达1350MPa,MRA为94.8的情况下,其断裂韧性Kk值仍高达5.5MPam1/2,并能以100m/min的速度切削硬度高达HRC66的淬火轴承钢。这种材料的刀具切削高硬度淬火钢、高强度调质钢及普通钢的性能超过了国内各种陶瓷刀具及日本、美国的同类刀具。

基于Python语言金属切削仿真平台开发

在ABAQUS软件环境下,采用Python语言对金属切削过程进行二次开发,建立了金属切削仿真平台,实现了金属切削加工过程快速建模和仿真结果的自动化输出。基于所建仿真平台,进行正交切削仿真,将仿真结果与切削试验数据对比,验证了切削仿真模型.建立了变硬度材料切削仿真模型,并分析了变硬度材料的切削加工规律,探究了斜角切削时刀具前角和刃倾角对切削力的影响规律。本文研究将为切削加工机理分析和切削参数优化提供良好和高效的分析平台。