Machine Tool Dynamic Orientation for Turbine Blade Machining
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Solution Overview
Problem
Conventional machining methods for turbine blades using ball end mills result in uneven tool wear, rapid tool degradation, and inconsistent surface quality due to varying cutting speeds and feed rates, especially when machining nickel-based alloys, which are challenging to machine and require harsh conditions.
Innovation Solution
A machine tool with a numerical controller that executes a machining program for tool center point control, allowing tool orientation changes based on a set tool use range and tool orientation change waveform pattern, using a barrel tool to distribute cutting heat and maintain consistent machining conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tool center point control is used with fixed tool orientation for machining turbine blades, then machining precision is maintained, but tool wear concentrates at one location causing rapid tool degradation
Solution Approach 1:
The patent applies dynamics by transitioning from fixed tool orientation to dynamic tool orientation that changes during machining. The tool orientation is varied according to a predetermined waveform pattern, allowing different portions of the tool cutting edge to contact the workpiece at different times, thereby distributing wear and extending tool life while maintaining machining precision through continuous numerical control adjustment
2Duration of action of moving object
If tool orientation is changed to distribute cutting edge usage, then tool life is extended, but cutting speed varies causing inconsistent surface quality
Solution Approach 1:
The patent applies periodic action by varying the tool orientation according to a predetermined waveform pattern (such as sine wave) that periodically changes the contact position between tool and workpiece. This periodic variation in orientation distributes cutting edge usage over time while the controlled nature of the waveform ensures that cutting speed variations remain within acceptable ranges, maintaining consistent surface quality
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the tool orientation angle as a controlled variable during machining. By changing the orientation parameter according to a predetermined waveform, the system distributes cutting edge usage to extend tool life while the controlled parameter variation ensures cutting speed remains within acceptable limits for consistent surface quality
3Ease of operation
If constant main spindle rotation speed and feed speed are used, then machining process is simple to control, but cutting speed varies with tool orientation causing poor machining quality
Solution Approach 1:
The patent applies dynamics by making the tool orientation dynamic while keeping rotation speed and feed speed constant. This dynamic orientation change allows different cutting edge portions to engage the workpiece, distributing wear and extending tool life, while the controlled variation maintains acceptable cutting speed ranges for consistent machining quality without requiring complex real-time speed adjustments
Data Source
AI summary
A machine tool includes a linear movement axis for moving a main spindle, at least two linear movement axes for moving a table, and a rotation table including at least one rotation axis, the rotation table being placed on the table. A numerical controller performs machining by executing a machining program for tool center point control where the tool orientation is fixed to a certain axis or a certain surface, and by changing the tool orientation by controlling each axis of the machine tool based on set tool use range and tool orientation change waveform pattern.