Precision Turning With Radial Error Correction for 10 μm Tolerance
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Solution Overview
Problem
Existing turning methods struggle to achieve high accuracy dimensional tolerances of 10 μm or less without relying on additional grinding processes, as they lack precise control over the relative movement between the spindle and the turning tool.
Innovation Solution
A turning method involving multiple movement apparatuses to adjust the cutting edge of the turning tool in both radial and axial directions, with high-precision correction mechanisms to ensure accurate positioning and error correction, allowing for precise turning without additional grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If turning is performed with a grinding allowance left and grinding is repeated to achieve narrow dimensional tolerance, then manufacturing precision is improved, but productivity deteriorates due to multiple processing steps
Solution Approach 1:
The invention extracts the grinding process from the combined turning-grinding workflow and replaces it with a specialized high-precision turning mechanism. The turning tool is equipped with a correction mechanism that independently adjusts the relative position between the spindle and tool, eliminating the need for separate grinding operations while achieving the same dimensional tolerance of 10 μm or less.
Solution Approach 2:
The invention changes the control parameter from static tool positioning to dynamic relative position correction. By introducing a correction mechanism that continuously adjusts the radial or axial distance between the spindle rotation axis and the turning tool cutting edge based on measured dimensional deviations, the system achieves high precision turning in a single pass without requiring multiple grinding cycles.
2Productivity
If turning is performed with high accuracy by only turning without grinding, then productivity is improved, but manufacturing precision deteriorates due to inability to control relative movement error
Solution Approach 1:
The invention implements a closed-loop feedback system where the measured dimensional value of the workpiece is compared with the target dimensional value, and the difference (error) is used to correct the relative position of the turning tool. This feedback mechanism enables single-pass turning to achieve dimensional tolerance of 10 μm or less by dynamically compensating for relative movement errors between the spindle and tool.
Solution Approach 2:
The invention replaces the traditional mechanical grinding system with a corrected turning system. Instead of using a separate grinding process to remove material and achieve precision, the system uses a correction mechanism that adjusts the turning tool's position radially or axially relative to the spindle, substituting mechanical grinding with precision-controlled turning followed by real-time correction.
3Manufacturing precision
If a correction mechanism is introduced to adjust cutting edge position, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The invention segments the turning system into independent functional modules: the spindle apparatus, the turning tool, and the correction mechanism. The correction mechanism is further divided into radial correction (adjusting radial distance) and axial correction (adjusting axial distance) components. This modular segmentation allows the complex correction function to be implemented through simple, dedicated mechanisms rather than a monolithic complex system.
Solution Approach 2:
The invention introduces dynamic adjustability to the turning tool positioning system. The correction mechanism enables real-time modification of the cutting edge position during or between turning passes, transforming a static positioning system into a dynamic one. This allows the system to adapt to dimensional deviations and achieve high precision without requiring overly complex pre-positioning mechanisms.
Data Source
AI summary
A turning method includes driving a first movement apparatus to locate a cutting edge of a turning tool at a first radial position; driving a second movement apparatus to move the turning tool in an axial direction to perform first turning with the cutting edge at the first radial position; driving the second movement apparatus to move the turning tool away from a workpiece in the axial direction after performing the first turning; calculating an error between the processed dimension and a target dimension; driving a third movement apparatus, which is configured to move the turning tool relative to the first movement apparatus in a radial direction, to locate the cutting edge of the turning tool at a second radial position to correct the error; and driving the second movement apparatus to move the turning tool in the axial direction to perform second turning at the second radial position.