导电加热切削最佳加热电流的确定

对导电加热切削的最佳温度及最佳加热电流进行了分析，在用 耐用度确定最佳加热电流方法基础上，提出一种基于最佳切削温度守恒定以确定最佳加热电流的新方法，该方法可迅速确定不同切削条件下的最佳加热电流，为导电加热切削过程提供了优化控制依据。     

导电加热切削最佳加热电流的确定及其控制

在导电加热切削过程中，如何保证以最佳的加热温度进行切削是提高导电加热切削效果的关键问题。本文从刀具耐用度，加工表面粗糙度等方面研究了导电加热切削的最佳加热电流，以高频ＩＧＢＴ逆变开关电源进行试验，设计了导电加热切削加热电流控制系统，并进行了温度控制试验。     

导电加热切削最佳加热电流的实验研究

在导电加热切削过程中,如何保证以最佳的加热电流或温度进行切削是提高导电加热切削效果的关键问题。对 导电加热切削最佳加热电流进行了分析和实验研究,为导电加热切削技术的实际应用提供了有益的参考。     

导电加热切削最佳加热电流的确定及其控制

在导电加热切削过程中，如何保证以最佳的加热温度进行切削是提高导电加热切削效果的关键问题．本文从刀具耐用度、加工表面粗糙度等方面研究了导电加热切削的最佳加热电流，以高频ＩＧＢＴ逆变开关电源进行试验，设计了导电加热切削加热电流控制系统，并进行了温度控制试验。     

导电加热切削最佳电流数据库的建立

对导电加热切削中主要电参数进行了分析与检测，提出一种快速确定最佳加热电流的新方法，建立了相应的数据库，供导电加热切削过程中电参数的适应性控制使用。     

导电加热切削有限元仿真及试验研究

正交回归试验建立的导电加热切削加热电阻经验公式表明,加热电流对加热电阻的影响最大。利用加热电阻经验公式进行了有限元分析,归纳出加热电阻焦耳热产生温升的经验公式。结合三维切削模型和Umbrello本构方程,对导电加热切削的切削力和温度场进行了三维有限元仿真及试验验证。加热电流I≥160A时可以得到较小的切削力;切削变形区的切屑处温度最高;最佳切削温度对应的最佳加热电流为168～190A。     

基于状态参量检测的导电加热切削最佳电流控制

提出利用切削状态当量电阻作为导电加热切削中的电流控制参数，并对该参量和切削用量的变化关系进行了分析。试验证明，切削状态当量电阻能有效反映切削条件的变化，通过检测其变化可实现导电加热切削加热电流的最佳控制。     

导电加热切削对加工表面质量的影响

为在导电加热切削中获得最佳加工表面质量,对加热电流与切削用量的关系进行了试验研究,并对最佳加热电流的概念进行了分析讨论。     

导电加热切削地加工表面质量的影响

为在导电加热切削中获得最佳加工表面质量,对加热电流与切削用量的关系进行了试验研究,并对最佳加热电流的概念进行了分析讨论。     

导电加热切削模糊控制系统的研究

针对导电加热切削的特点，将模糊控制方法引入其中，研制了一套采用计算机控制的导电加热切削模糊控制系统，并进行了实验验证。     

Finite element simulation and experimental research on electric hot machining

Electric hot machining (EHM) can improve cutting performance through heating resistance, which softens the material in the deformation zone. In this study, an empirical formula for heating resistance is presented, and its variance with the orthogonal regression experiments is analyzed. The results show that heating resistance increases with cutting speed and heat current but decreases as feed rate and cutting depth increase. Feed rate has the greatest influence on heating resistance. Furthermore, an empirical formula with finite element simulation (FES) is constructed to describe the temperature increase triggered by Joule heating of the heating resistance. Both three-dimensional (3D) FES and experimental verification of the cutting force and the temperature field during the EHM process are conducted, combined with a 3D cutting model and an Umbrello constitutive relation. The results show that a lower cutting force can be achieved when the heating current is greater than or equal to 160 A. The chip in the deformation zone has the highest temperature, and the optimal heating current for optimal cutting temperature is 168 to 190 A.     

Analysis of tool temperature fluctuation in interrupted cutting

A unidimensional model for temperature distribution in the tool during intermittent cutting is presented. The tool-chip interface heating is approximated by a periodic rectangular heat flux. The effects of cutting time ratio, frequency of temperature fluctuation and thermal diffusivity of the tool material on internal temperature distribution and on thermal stresses developed in the tool have been discussed. With increasing cutting frequency, the temperature gradient in the cutting zone increases, but with higher thermal diffusivity of the tool material, it diminishes. The magnitude of thermal stresses increases with increase in amplitude of temperature fluctuation     

Some aspects of friction heating during metal cutting

Three aspects of friction heating during cutting are considered approximately by simple analytical means. Tool-temperature distributions when cutting nickel have recently been found to be very different from those when cutting iron or titanium; it is shown that the difference is caused by the different thermal properties and cutting conditions of these metals. The dependence on cutting conditions of the reduction of tool rake face temperatures by coolants is calculated and is compared with experiment; the calculations, based on extreme assumptions of coolant efficiency, overestimate the fractional reduction of rake face contact temperature by a factor of 2. Initial heating is considered to determine the times required to establish a steady state heat flow into the tool. This last calculation is relevant to friction cutting; it is shown that in some practical conditions it is not valid to use steady state formulae for temperature estimation.     

电镦机智能化改造

常规电镦机各工艺参数多为恒值，在镦粗过程中不能实进控制。本文介绍一种新型电镦机计算机控制系统。在对镦粗速度、加热电流、镦粗压力等主要工艺参数分析的基础上，建立了工艺过程的优化控制系统。优化目标为最佳成形温度，而温度的控制主要通过压力控制来实现。     

辊压适张度处理对圆锯片临界转速的影响

利用非线性理论和矩阵摄动理论，研究了离心力场 、切削温度场及辊压适张度位置对圆锯片动态特性和临界转速的影响；对离心力场、切削温度场共同作用下的锯片最佳辊压适张度处理位置进行了计算分析；还分析了锯夹半径对最佳辊压位置的影响。     

AN EXPERIMENTAL EVALUATION OF CUTTING TEMPERATURES DURING HIGH SPEED MACHINING OF HARDENED D2 TOOL STEEL

This paper investigates experimentally the effects of different process parameters on the cutting edge temperature during high speed machining of D2 tool steel using polycrystalline cubic boron nitride (PCBN) tools. The cutting edge temperature is measured using thermocouples. The process parameters considered are cutting speed, feed rate, nose radius, rake angle, and tool wear. The effects of different edge preparations including sharp, honed and chamfered are also investigated. The results show that increasing cutting speed and feed rate increases the cutting temperature while increasing nose radius reduces the cutting edge temperature. In addition, there is an optimum rake angle value at which minimum cutting temperature is generated.     

具有温度补偿的自然热电偶法测量切削温度的原理及计算方法

介绍了温度补偿情况下切削温度的测量原理、热电偶间的热电关系,推导了计算公式,并给出了ＰＣＢＮ刀具切削不同硬度淬硬轴承钢时切削温度的测量结果及计算实例。