INFLUENCE OF FEED RATE ON THE DYNAMIC PROPERTIES OF THIN-WALLED PART DURING END-MILLING
DOI:
https://doi.org/10.20998/2078-7405.2024.100.07Keywords:
milling, milling cutter, thin-walled part, feed rate per tooth, oscillogram, ; accompanying free oscillationsAbstract
When selecting cutting modes for end-milling of thin-walled parts from hard-to-machine materials, their influence on machining stability must be considered. To do this, it is necessary to understand the types of vibrations that operate and the conditions under which they arise. Research has shown that different types of vibrations operate sequentially during cutting and only for a certain of time. During end-milling, forced and accompanying free oscillations operates due to the short duration of cutting. Their influence on the stability of the cutting process depends on the speed zone in which the milling takes place. The most unfavorable is the third speed zone of vibrations, where accompanying free vibrations of high intensity occur. Cutting speeds for machining parts from hard-to-machine materials fall precisely within this zone. The intensity of vibrations is influenced by the dynamic properties of the part. During end-milling of thin-walled parts, these properties are characterized by the amplitude and frequency of accompanying free vibrations, which exceed the natural frequency of the part's free vibrations. In other words, cutting modes alter the dynamic properties of the part. Some researchers focus on utilizing the damping properties of the feed. Therefore, the aim of this paper was to determine how the feed affects the dynamic properties of the part during cutting. A universal stand was used for the investigation, which allows for the creation of various dynamic characteristics of the processed sample and recording its motion laws during milling on an oscillogram. The research results showed that the feed, as an element of cutting modes, influences the dynamic properties of the part during cutting. It creates a variable layer that is being cut. Therefore, during the cutting time, the frequency and amplitude of accompanying free vibrations change during both up- and down milling. The feed affects the dynamic stiffness. Increasing the feed increases the dynamic stiffness of the part. This leads to a reduction in the amplitude of accompanying free vibrations during milling in the third speed zone of vibrations. The results presented in the article have practical significance for technologists in the aviation manufacturing industry. They help to better understand the physical processes occurring during milling and develop optimal processing strategies for thin-walled parts, which have high requirements for dimensional accuracy and surface quality.
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