Determination of Optimal Milling Modes by Means of Shock-Vibration Load Reduction on Tool and Peak-Factor Equipment

Abstract

Vibrodiagnostics of metal-cutting machines is an efficient method to increase reliability of all elements of the technological system «machine tool-device-instrument-detail». The development of vibrodiagnostic methods is especially important for milling metal-cutting machines which operate in intermittent cutting mode and are exposed to shock-vibration loads. One of the trends in the development of metal cutting equipment is to increase its productivity by expanding the ranges of cutting modes. Increase in the combination of cutting modes leads to increased probability of coincidence of the natural frequencies of the equipment and the frequencies of the cutting process which in its turn leads to operation of the machine equipment elements under resonance conditions. In the article we provide the results of our research aimed to develop the method to reduce shock-vibration load on tool and peak-factor equipment of milling machine. In our research we developed the technique that makes it possible to measure not only the general level of vibration, but also other parameters used for vibrodiagnostics, for example, the value of the peak factor has been developed. The method includes the development of a principle layout and of a plan for a three-factor experiment, construction and analysis of vibrational and spectral diagrams of the milling process for the assignment of optimal modes that provide machine operating at lower level of shock-vibration loads. Based on the results of the work we have come to the conclusion that it is rather promising to use the peak factor in analysis of the milling machines reliability.

Methodology of ensuring the efficiency of mechanical processing due to the application of vibration monitoring and vibration protection means

“…(Fig. 3) and requires a mandatory (unconditional) transition to structural methods of vibration protection, the use of structural methods of vibration protection, consisting of: 1. in the application of vibration-damping supports of technological equipment (machine tools) or checking their defects or the foundation (VDEM block 22.1); 2. elimination of vibration in the source by installing a vibration damper (VSVD block 22.2) [23,24]; l2=0 -it is necessary to control the "internal" influenes, which requires a transition to block 12. Block 13-is required to determine the level of vibration at idle, i.e.…”

“…manufacturing of elements of a technological system by the method of additive technology (AT block 21.5)[23][24][25], which means the manufacture of tools, fixtures and other technological elements with increased damping properties, as well as other solutions. It should be especially noted that the correction of the machining modes (CMM block 21.1) and the change of COTS (RCCF block 21.2) can be used not only in the development of the technical process, but also directly for the adaptive control of CNC machines.…”

Calculation of Structural Parameters and Design of a Protective Shield for an X-Ray System

“…When creating a new x-ray tomograph systems the design stage is fundamental [13]. At this stage the key parameters of technical system according to the specification pay off, essentially new technical solutions are developed [14,15], configuration of system is made [16,17].…”