ABSTRACT
Heavy spindle tops are one of the important components in the direct bearing of the weight and the reaction force of associated workpieces. The top and the workpiece rely on the cone contact of the centre hole to ensure that the workpiece centre and the centre of head and tail frame are consistent (Chen, 2013). At present, the research on the process and stress of the spindle is not adequate. In the design and calculation of the top structure of such spindles, the method used is simple and rarely even calculated. The design work has blind spots, which seriously affect spindle performance (Xu & Sheng, 2008; Li, 2007). For workpieces of different weights, the use of the angle and the tightening force of the top are not aligned (Wang & Yu, 2002). In actual factory production, the ratio of the height and diameter of the spindle top is either 1:4 or 1:7, and the principle of selection of a variety of different load conditions in the process of use is not stipulated, but is solved in accordance with empirical data that has been in the field for a long time.With the progress of modern science and technology, a variety of advancedmachines continue to emerge; thus, a variety of parts of complex shape and high precision can be produced.Among them, the processing of the rotary body accounts for a large proportion, which creates a higher demand of the process performance and carrying capacity of the spindle top (Cui &Wang, 2006).
