车床螺纹加工系统的经济型数控改造

本文介绍了数控车床螺纹加工的基本原理,及普通车床螺纹加工系统经济型数控改造的方法和注意事项。     

能加工特长齿条的数控车床

针对齿条的特点,给出了在数控车床上进行加工的方法。分析了加工的切削运动,给出了刀具运动轨迹曲线以及对通用数控车床的改造设计。     

Non-circular cutting with a lathe using a three-stage intelligent controller

In this paper, a three-stage intelligent controller (TSIC) for non-circular cutting with a lathe (NCL) is developed. In the first stage, an effective neural network is used to learn the dynamics of the voice coil servomotor system. Then a modified zero-phase tracking control (MZPTC) based on the learned model is designed to obtain an acceptable tracking result. Because MZPTC is a type of feedforward control, its performance cannot be ensured as the system is subjected to external load or the aging of system components. In the second stage, an adaptation in control input generated by a fuzzy sliding-mode control is then synthesized with the previous MZPTC to ameliorate control performance. The third stage is to use a forecast compensate control to compensate the cutting error caused by the variant cutting depth (or cutting force). The experimental results of NCL using TSIC, including tracking accuracy (i.e. profile error of finished workpiece) and smoothness of control input (i.e. surface roughness of finished workpiece), are much improved.     

钻具车修中心架和作业线装置的研制

通过对钻具螺纹车修减振中心架与作业线装置的研制．解决了钻具螺纹车修过程中，因钻具振动造成的车床损坏和车修质量问题。实现了钻具上下车床的半自动化．提高了工作效率，减轻了劳动强度，保证了钻具螺纹的车修质量。     

CA6140型普通车床数控化改造

以CA6140型普通车床为例,从机械和电气2方面详细阐述了数控化改造的方法。改造后的车床投入使用后,运行稳定,加工精度明显提高,取得了极大的经济效益。     

类复向量矩阵在转位车刀几何角度计算中的应用

采用类复向量矩阵计算可转位车刀的几何角度，使坐标变换次数和被变换的向量的数目明显减少，计算过程简单、方便。     

Equivalent fatigue load in machine-tool probabilistic reliability. Part II: Calculation methodology and practical applications

This paper deals with the calculation and practical application of equivalent fatigue load in probabilistic reliability. To illustrate the physical meaning and practical use of the theoretical formulae derived in Part 1 of this paper, Part II considers the design example of a multicut semi-automatic lathe. It analyses the power and torque characteristics and special statistical law of load and speed change for the lathe. Equivalent fatigue loads with specified reliability for the important driving elements of the lathe under various working conditions are found on the basis of calculating the reliability factor, the power utilization and the speed change factor. Use of the equivalent fatigue load determined in the paper to design the lathe elements would enable it to obtain the expected reliability.     

PCBN刀具在微凸桶形滚轮加工中的应用

通过精密微凸桶形滚轮的加工难点的分析,指出应用PCBN刀具实现"以车代磨"的可行性。通过制定合理的加工工艺、设计专用工装、选择合适的刀具及几何参数、优化切削参数,解决了微凸桶形滚轮精密加工的难题,实际加工结果表明,该工艺方案可行,具有一定的推广价值。     

大型卧式车床的低速制动控制方案研究

基于速度检测的思路提出了两种机床主轴低速刹车系统控制方案,分别采用计时器和计数器对主轴速度进行判断,当速度低于安全值时系统能使用刹车信号,否则刹车操作失效不能实施紧急制动,从而确保生产安全.分析了两方案的工作原理,指出了各自的技术特点和使用场合.     

基于单工位超长大直径铝棒车床的设计

本文介绍了一种能加工超长大直径铝棒的车床,设计加工铝棒长度6000mm,直径168mm,且可调整用来加工直径100mm～168mm之间任意尺寸的铝棒。该机床主切削速度为316000mm/min,进给速度最大为900mm/min,且变频可调。