Blisk Machining Center Layout for Lower 5-Axis Motion Demands
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Solution Overview
Problem
The manufacturing of aero-engine blisks is hindered by the complex profile of the blade, high machining accuracy and surface quality requirements, and limited tool movement space, making it difficult to achieve consistent machining on free-form surfaces.
Innovation Solution
A blisk machining center is designed with A-axis, B-axis, and C-axis rotary assemblies, where the A-axis drives the blisk rotation, the B-axis rotates the attachment head and tool, and the C-axis adjusts the A-axis, ensuring the machining area is near the C-axis turntable's rotation center, with a 45° angle between the attachment head and tool axes to reduce speed and acceleration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 5-axis rotary tool machining is performed on blisk with complex free-form surfaces, then machining capability is improved, but motion speed and acceleration requirements of physical axes become extremely high
Solution Approach 1:
The patent repositions the machining area to be near the rotation center of the C-axis turntable, and places the tool tip on the B-axis rotation axis. This dimensional reconfiguration transforms the motion requirements by creating a geometric relationship where the intersection of B-axis and C-axis rotation centers becomes the machining area center, thereby reducing the speed and acceleration demands on linear axes while maintaining 5-axis rotary tool machining capability
2Volume of moving object
If the machining area is positioned away from the rotation center, then tool movement space is increased, but speed and acceleration of physical axes increase significantly
Solution Approach 1:
The patent resolves this contradiction by changing the dimensional relationship between the machining area and rotation centers. By positioning the machining area at the intersection of B-axis and C-axis rotation centers, and placing the tool tip on the B-axis rotation axis, the system achieves adequate tool movement space through rotational degrees of freedom rather than linear displacement, thereby keeping physical axis speed and acceleration within lower ranges
3Ease of operation
If the central axis of attachment head and ram form a smaller angle, then tool accessibility is improved, but speed and acceleration of linear axes increase during RTCP rotation
Solution Approach 1:
The patent optimizes the included angle between the central axis of the attachment head and the central axis of the ram to be 45 degrees. This parameter optimization balances tool accessibility with motion requirements, ensuring that the large speed and acceleration of linear axes are avoided when the attachment head performs RTCP rotation, while still maintaining adequate tool accessibility for machining operations
Data Source
AI summary
The present invention provides a blisk machining center, including: A-axis rotary assembly, B-axis rotary assembly and C-axis rotary assembly, wherein the A-axis rotary assembly drives the blisk to rotate, the B-axis rotary assembly drives an attachment head to rotate, and the attachment head drives a tool to machine the blisk, and the C-axis rotary assembly drives the A-axis rotary assembly to rotate, wherein the intersection of the rotation axis of the B-axis rotary assembly and the rotation axis of the C-axis rotary assembly is the center of the machining area of the blisk, and the tip point of the tool is on the rotation axis of the B-axis rotary assembly. In the present invention, the machining area is near the rotation center of the C-axis turntable, which ensures that the speed and acceleration of the movement of each physical axis are kept within a lower range than those of general machine tools when the machine tool is performing the machining of the 5-axis rotary tool center point.