Abstract
The paper presents an original method for stability analysis of the main spindle variations in transversal direction at CNC lathe, which by means of the Mihailov criterion and adequate software packages, establishes the dynamic instability character due to the specific processing conditions and to the grinding regime parameters. This creates the premises for rational design of the turning process, as well as for the structural design of the turning tool.
Highlights
Increased demands on the quality of finished industrial products due to increasing market competition has led to design and usage of high productivity modern machines and equipment like CNC machines, processing centres and integrated systems of CNC machines such as flexible processing cells and flexible processing systems [1], [2], [3].For this reason, studying the vibrations and analyzing ways of reducing them plays an important role in designing high performance equipment [4].Ensuring a low level of vibrations creates the premises for achieving a sufficient stability degree for high precision processing, with superior surface quality and increased productivity [5], [6].All these eventually add up into complex products and parts with a high degree of automation and mechanization.Stability Analysis of the Main Spindle Vibrations in Transversal Direction at CNC LatheFor this purpose, it is necessary to determine the equations that describe the vibration movement of the main spindle at CNC lathe
For analysis of the vibrations in transversal direction we take into account the solutions of the system of first order differential equations that generate the vibration movement of the main spindle [7]: v i 3
The analysis of the main spindle vibrations in transversal direction at internal grinding shows the specific characteristic of this grinding process, that is the dynamic instability which determines an increase of the amplitude level in a short period, due to the loading of the abrasive tool, which leads to a deterioration in the surface quality and to processing stop
Summary
Increased demands on the quality of finished industrial products due to increasing market competition has led to design and usage of high productivity modern machines and equipment like CNC machines, processing centres and integrated systems of CNC machines such as flexible processing cells and flexible processing systems [1], [2], [3].For this reason, studying the vibrations and analyzing ways of reducing them plays an important role in designing high performance equipment [4].Ensuring a low level of vibrations creates the premises for achieving a sufficient stability degree for high precision processing, with superior surface quality and increased productivity [5], [6].All these eventually add up into complex products and parts with a high degree of automation and mechanization.Stability Analysis of the Main Spindle Vibrations in Transversal Direction at CNC LatheFor this purpose, it is necessary to determine the equations that describe the vibration movement of the main spindle at CNC lathe. Ensuring a low level of vibrations creates the premises for achieving a sufficient stability degree for high precision processing, with superior surface quality and increased productivity [5], [6]. Stability Analysis of the Main Spindle Vibrations in Transversal Direction at CNC Lathe
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