Curved Surface Machining Using Low-Inertia Axis Motion
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Solution Overview
Problem
In machining blade components with curved surfaces, vibrations caused by acceleration and deceleration during linear movement of the workpiece along the Y-axis direction lead to reduced machining speed to prevent surface quality issues, necessitating an improvement in surface quality without speed reduction.
Innovation Solution
The method involves using a workpiece machining technique where the rotary table and tool move relative to each other along two perpendicular linear movement axes, with the first axis having a smaller motor load, allowing the workpiece to be rotated about two perpendicular turning axes, thereby reducing vibrations by minimizing the inertia moment of the X-axis table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the workpiece is linearly moved along the Y-axis direction during removal machining, then the curved surface can be machined, but vibration is caused due to great inertia moment of the Y-axis table, reducing machining speed
Solution Approach 1:
The patent inverts the conventional machining approach by switching the linear movement axis from Y-axis to X-axis. Instead of moving the workpiece along the Y-axis while rotating about the C-axis, the workpiece is moved along the X-axis while rotating about the C-axis. This inversion allows machining of the curved surface along its direction of curvature using the X-axis table, which has a smaller inertia moment and thus generates less vibration during acceleration and deceleration, enabling higher machining speeds without compromising surface quality.
2Ease of operation
If the Y-axis table moves the rotary table and workpiece during linear movement, then the curved surface can be machined, but the great inertia moment causes great motor load and vibration
Solution Approach 1:
The patent applies the inversion principle by swapping the roles of the X-axis and Y-axis tables in the machining process. The X-axis table, which has a smaller inertia moment and thus requires less motor force, is used to perform the linear movement necessary for machining the curved surface. The Y-axis table is no longer burdened with moving the heavy rotary table and workpiece during the machining operation, significantly reducing its motor load and eliminating the vibration problem associated with high inertia.
Data Source
AI summary
The purpose of the present invention is to improve the machined-surface quality of a curved surface of a workpiece without reducing the machining speed when the curved surface is subjected to removal machining. Provided is a workpiece machining method in which a rotating table on which a workpiece is placed and a tool are relatively moved along two linear movement axes orthogonal to each other, the workpiece is rotated about each of a first turning axis and a second turning axis orthogonal to each other by the rotating table, and at least one curved surface of a protruding curved surface and a recessed curved surface is subjected to removal machining. The method includes: disposing the first turning axis so as to be parallel to a first linear movement axis of the two linear movement axes, the motor load during linear movement in the first linear movement axis being relatively small; disposing the second turning axis on a plane perpendicular to the first linear movement axis; and subjecting the curved surface to removal machining along the direction of curvature while moving the workpiece along the first linear movement axis and rotating the workpiece about the second turning axis.