Abstract
In order to study the vibration characteristics of the workpiece spindle of a gear hobbing machine, this paper established a mathematical model for the workpiece spindle vibration displacement in the x-axis direction. To verify the reliability of the proposed model, a series of experiments were run on the CNC gear hobbing machine. The relative error between the experimental data and the calculated values was lower than 5 %, which proves that our proposed mathematical model is qualified to be a research tool for the investigation of the variation law of the workpiece spindle. According to the analysis results, the workpiece spindle vibration displacement literally decreases with the increasing order, and the hobbing process with high hob revolution speed and small cutting depth is preferable for gear hobbing accuracy.
Highlights
IntroductionThe high-speed cutting hobbing machine tool is a kind of specialized CNC (computerized numerical control) machine tool for gear processing
The high-speed cutting hobbing machine tool is a kind of specialized CNC machine tool for gear processing
According to the principle of vibration dynamics as well as the Euler-Bernoulli beam theory, the theoretical model of vibration displacement of workpiece spindle of gear hobbing machine was deduced, which can directly predict the amount of displacements based on the spindle structure and process parameters
Summary
The high-speed cutting hobbing machine tool is a kind of specialized CNC (computerized numerical control) machine tool for gear processing. In the processing of high-speed-heavy-duty gear hobbing, there are many vibration sources. These include the servo motor(s), guide screw, hydraulic cylinders and hobbing vibration. The hobbing vibration, as the biggest effect factor, affects the gear processing quality in three ways, i.e., deviation of meshing point between hob and workpiece, additional dynamic load to hob causing the acceleration of cutting tool wear and vibration marks on the gear surface [8,9,10]. Study on the spindle vibration characteristics is meaningful to improve the processing quality and prolong the hob life for gear hobbing machine tools
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