Slanting-Bed Propeller Machining to Reduce Spindle Vibration
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Solution Overview
Problem
Traditional methods for manufacturing large propellers face challenges with low efficiency, poor accuracy, and high labor intensity due to the complexity of processing three-dimensional helical curved surfaces, and existing solutions do not effectively address the issue of spindle stiffness and vibration, leading to suboptimal processing quality.
Innovation Solution
A slanting-bed feed processing machine tool with a slanting column feed bed design that reduces the overhang length of the spindle, incorporating a machine tool spindle, workpiece rotary worktable, and bed feed mechanism with 4 degrees of freedom, which includes vertical and inverted slanting column feed beds and corresponding feed mechanisms to enhance processing stiffness and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the overhang length of the spindle is increased to ensure processing integrity of the hub and blade root, then the processing coverage is improved, but the stiffness of the process system is greatly reduced
Solution Approach 1:
The patent introduces a slanting column feed bed that moves between two blades, changing the spatial arrangement from a traditional horizontal approach to a slanting approach. This dimensional change allows the spindle to access the hub and blade root areas without excessive overhang, as the slanting column can approach the workpiece from a different spatial direction, reducing the overhang length while maintaining processing coverage
Solution Approach 2:
The slanting column feed bed acts as an intermediary mechanism between the spindle and the workpiece. It provides a stable support structure that allows the spindle to maintain a shorter overhang length while still achieving the necessary processing positions. The slanting column feed bed moves between two blades to access the hub and blade root areas, serving as a mediator that enables processing integrity without requiring excessive spindle overhang
2Adaptability or versatility
If a multi-axis control system is used to process the three-dimensional helical curved surface, then the processing capability is improved, but coupling errors increase and processing accuracy decreases
Solution Approach 1:
The patent segments the motion control into distinct, independent components: the workpiece rotary worktable handles rotation, the bed feed mechanism handles linear feed motion, and the slanting column handles positioning between blades. This segmentation allows each component to be controlled independently with fewer axes, reducing coupling errors while maintaining the capability to process three-dimensional helical curved surfaces through coordinated motion of the segmented components
Data Source
AI summary
The present invention relates to a slanting-bed feed processing machine tool of a large propeller. The machine tool comprises a slanting column feed bed, a machine tool spindle, a workpiece rotary worktable, a large propeller and a bed feed mechanism. The present invention coordinates the geometrical relationship between the machine tool and the large propeller to ensure that the slanting column feed bed moves between two blades, thereby reducing the overhang length of the spindle. Different forms of workpiece rotary worktables and bed feed mechanisms are selected according to different slanting column feed beds. Four types of slanting column feed beds are designed, which can be selected, optimized and applied for different processing objects. The present invention enhances the processing stiffness of the spindle and solves the problem of poor processing quality of the large propeller caused by machine tool vibration.