Machining Arm Sensor Data Correction for Mold Deviation
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Solution Overview
Problem
Conventional machining data correction methods often result in entire data shifts, leading to dimensional errors in large or long-size moldings due to distortion or mold wear, which can compromise product quality by altering the shape of the product.
Innovation Solution
A control device for a machining apparatus equipped with a multi-joint arm and a distance measurement sensor that corrects machining data for each machining surface based on precise measurements, allowing for accurate alignment and rotation adjustments to maintain product dimensions within tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correction methods shift entire machining data to eliminate errors, then positional deviation is corrected, but dimensional accuracy and product shape are compromised
Solution Approach 1:
The patent divides machining data into multiple segments corresponding to different machining surfaces. Instead of applying a uniform shift to the entire workpiece, the system measures each surface independently and applies targeted corrections only to affected segments. This segmentation allows positional deviation correction without compromising the dimensional accuracy of other surfaces.
Solution Approach 2:
The invention implements local quality correction by applying different correction values to different machining surfaces based on their specific measurement results. Each surface receives customized correction tailored to its actual deviation, rather than a blanket correction applied uniformly across the entire workpiece. This preserves the original shape and dimensional relationships while correcting local positional errors.
2Manufacturing precision
If finish machining is performed on all surfaces to ensure tolerance compliance, then dimensional accuracy is improved, but productivity decreases and product quality is compromised
Solution Approach 1:
The system applies correction only to the extent necessary for each machining surface based on actual measurement deviations. Instead of performing exhaustive finish machining on all surfaces, the invention applies partial corrections only where needed, eliminating unnecessary machining operations while ensuring tolerance compliance for affected surfaces.
3Stability of the object's composition
If a jig is used to secure the workpiece at a specified position, then positional stability is improved, but machining accuracy decreases for workpieces that cannot be secured by the jig
Solution Approach 1:
The patent implements a feedback mechanism where each machining surface is measured after positioning, and correction values are calculated based on actual measurement results. This feedback loop allows the system to compensate for positioning errors that occur when workpieces cannot be fully secured by the jig, restoring machining accuracy without requiring complete positional stability during setup.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables precise correction of machining data, ensuring higher accuracy and maintaining product quality by addressing positional and geometrical deviations in large or long-size moldings, even when supported in a cantilever fashion.
Implementation Method 1
a distance measurement sensor placed on the arm and that measures a distance between the machining object and the machining apparatus for each machining surface of the machining object
Data Source
AI summary
A machining apparatus includes a multi-joint arm provided with a machining tool for machining a workpiece. A control device of the machining apparatus includes: a storage section for storing NC data indicating a machining region of a workpiece by the machining apparatus; a distance measurement sensor placed on the arm and for measuring a distance between the workpiece and the machining apparatus for each machining surface of the workpiece; and a correction section for correcting the NC data for each of the machining surfaces based on a measurement result by the distance measurement sensor. As a result of this, the machining apparatus can perform the correction of machining data in correspondence to deviation of a machining object with higher accuracy.