Abstract
Modern machine building needs demand for machines and control systems which provide higher accuracy of machining. For this purpose, setup methods are being researched and accuracy of machines and devices is being improved. The main topic of this paper is a tool path predistortion system which is necessary for improvement of shaft turning accuracy when a steady rest cannot be used on a CNC machines. Calculation of such tool path requires one to know the cutting force during turning on a CNC lathe. The research in question allowed to determine the dependence of cutting force during turning on the power consumed by the feed drive, cutting depth, cutting velocity, and feed value. An equation for further calculation applicable to a specific lathe in the turning process was derived. This equation serves as basis for adaptive turning of shafts and other parts with the aid of a mathematical model, which must account for the cutting force. Application of this formula in a CNC controlled lathe’s parametric program will provide for higher accuracy of turning without special devices.
Highlights
Machining accuracy improvement is one of research trends in modern machine and instrument building
In order to calculate the tool path along the shaft it is necessary to determine the cutting force basing on work piece machining modes
Research methodology The task set in the course of this research was to determine the cutting force on the basis of cutting modes and CNC lathe parameters collected during task execution by the CNC unit
Summary
Machining accuracy improvement is one of research trends in modern machine and instrument building. Depending on work piece fixation practice various deviations of form develop in the process of machining of long nonrigid parts, such as shafts. For such scenarios path predistortion [1] is one of the ways of accuracy improvement for CNC lathes. Development of tapering during shaft machining is related to varying compliance of headstock and tailstock To solve this problem the machining program and tool path are adjusted after preliminary machining to compensate for the deviation by means of linear interpolation equal to the deviation value. In order to calculate the tool path along the shaft it is necessary to determine the cutting force basing on work piece machining modes.
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