Grinding Wheel Topography Scheduling for Stable Aero Part Grinding
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Solution Overview
Problem
Existing grinding processes for aero parts face challenges in accurately scheduling feed rates due to variations in grinding wheel topography, leading to increased scrap production and quality issues, as mere visual observations of wheel differences are insufficient for process control.
Innovation Solution
A method involving in-situ microscopy to measure grinding wheel topography, calculate parameters such as crystal density and area fraction, and use a physics-based simulator to determine optimized feed rate scheduling, incorporating power monitoring for real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If visual observation of grinding wheel is used, then simplicity of inspection is maintained, but measurement precision of wheel topography deteriorates
Solution Approach 1:
The patent replaces visual observation (optical system) with laser scanning technology to measure grinding wheel topography. The laser scanner emits laser beams that reflect off the wheel surface, and the reflected light is detected to calculate precise three-dimensional coordinates of surface points, achieving high measurement precision without relying on subjective visual inspection.
Solution Approach 2:
The patent introduces a laser scanner as an intermediary device between the grinding wheel and the measurement system. The laser scanner acts as a mediator that converts physical wheel topography into digital three-dimensional coordinate data, enabling precise quantitative measurement while maintaining operational simplicity through automated data acquisition.
2Ease of operation
If standardized feed rate is used, then ease of operation is maintained, but manufacturing precision of aero parts deteriorates
Solution Approach 1:
The patent transforms the static, standardized feed rate into a dynamic, adaptive feed rate schedule. The system continuously adjusts the feed rate based on real-time laser scanning data of wheel topography and simulated grinding forces, allowing the feed rate to vary throughout the grinding process to maintain precise control over aero part dimensions while adapting to changing wheel conditions.
Solution Approach 2:
The patent implements a feedback loop where laser scanning measurements of the grinding wheel are fed into a simulation model that predicts grinding forces and part deflection. These predictions are then used to adjust the feed rate schedule, creating a closed-loop control system that maintains manufacturing precision by continuously adapting to actual wheel topography rather than relying on fixed standardized rates.
3Productivity
If high feed rate is used, then productivity is improved, but manufacturing precision deteriorates due to part deflection
Solution Approach 1:
The patent performs preliminary laser scanning of the grinding wheel topography before the grinding operation begins. This advance measurement allows the simulation model to predict grinding forces and potential part deflection, enabling the system to pre-calculate an optimized feed rate schedule that maintains high productivity while compensating for expected deflection, thus achieving both high production rate and precision.
Solution Approach 2:
The patent dynamically changes the feed rate parameter based on simulated grinding forces and predicted part deflection. The system adjusts the feed rate schedule in real-time according to the actual wheel topography measured by laser scanning, allowing optimization of the feed rate to balance productivity and precision by adapting to specific wheel-part interaction conditions rather than using fixed high or low rates.
4Ease of operation
If fixed cutting depth is used, then ease of operation is maintained, but reliability of process control deteriorates due to wheel topography variations
Solution Approach 1:
The patent transforms the static, fixed cutting depth into a dynamic cutting depth schedule that adapts to wheel topography variations. The system uses laser scanning data to measure actual wheel surface profile and adjusts the cutting depth throughout the grinding process to maintain consistent material removal rates and surface quality, ensuring reliable process control despite variations in wheel condition.
Solution Approach 2:
The patent implements feedback control where laser scanning measurements of wheel topography are continuously fed into the control system. The measured wheel surface variations are used to adjust the cutting depth schedule in real-time, creating a closed-loop system that maintains reliable and consistent process control by compensating for wheel topography changes rather than relying on fixed predetermined depths.
Data Source
AI summary
Feed rate scheduling methods include measuring a topography of a grinding wheel of a machine tool, calculating a topography parameter using the topography, and calculating a feed rate scheduling parameter for a toolpath of the grinding wheel based on the topography parameter. The topography may be measured using microscopy. The topography parameter may include a plurality of parameters including a density of crystals at a given depth (C(h)) of the grinding wheel and/or an area fraction of crystals protruding at a given depth (α(h)) of the grinding wheel. The feed rate scheduling parameter may include a grinding wheel feed rate, a grinding wheel spin rate, and/or a grinding wheel cutting depth, among other parameters.