Mar 17,2026
Online measurement technology in mold processing: real-time feedback and closed-loop manufacturing
Online measurement technology in mold processing: real-time feedback and closed-loop manufacturing
In-process measurement, On-machine inspection, Closed-loop manufacturing, Precision machining, CMM
In precision mold manufacturing, processing precision is the lifeline. The traditional “processing-off-machine-detection-return-repair” model is not only inefficient, but also has double-clip errors. The emergence of online measurement technology (or on-machine detection) integrates the measurement process into the processing center, achieving seamless interconnection between processing and detection, laying the technological foundation for closed-loop manufacturing.
The core of online measurement is the installation of high-precision test heads on the machine board. The most common configuration is a triggering test head (such as the Renishaw OMP series) in the main axle blade storage of the processing center. When measurement is needed, the program automatically invokes the test head, performs touch measurements at specific points on the artifact, and transmits the measurement data to a numerically controlled system or external computer. For car-cutting centers, dual blade arm test heads are used. Modern test heads can achieve repeat accuracy of up to 1 μm, sufficient to meet the detection requirements for most mold processing.
The application of online measurement spans the entire process of mold processing. After rough processing, the position and residuals of the artifact can be quickly measured using head measurements, and rough坯 deviations can be automatically compensated to ensure uniform refined residuals. During the refined processing process, key features (such as conduit holes, type cavity frames) can be measured in-between to verify whether the dimensions are qualified. If deviations are found, subsequent blade patches can be immediately adjusted to achieve “compensation while processing.” After processing is complete, final size measurements can be taken, detection reports can be generated, and data can even be uploaded to the MES system for quality tracking.
The biggest advantage of online measurement is the reduction of auxiliary time and the elimination of secondary clamp error. Traditional detection requires removing the artifact from the machine and sending it to the three-coordinate meter, which not only takes time, but also results in positioning errors when re-clamping, especially severe for large casts. Online measurement is performed directly on the machine, without the artifact having to be moved, and the detection results truly reflect the processing state, which can be used immediately for decision-making. According to statistics, the adoption of online measurement can reduce the total cycle of mold processing by more than 30%.
Advanced applications of online measurement technology are adaptive processing and closed-loop manufacturing. When measurement head detection detects uneven processing residues, the system can automatically recalculate knife path, adjust cutting parameters, and avoid empty or over-cutting. When artifact sizes are detected to deviate from common deviation due to thermal deformation or knife wear, the system can automatically invoke compensation procedures to perform local fine-processing corrections. This is called “adaptive processing.” Furthermore, online measurement data is connected to CAD/CAM software and MES systems, forming a closed-loop data flow from design, programming, processing, measurement, to optimization, achieving true closed-loop manufacturing. For example, measurement data can be fed back to CAM software to optimize subsequent processing strategies for similar parts.
The implementation of online measurements requires attention to several key factors. First, the standardization of the head measurement. After each installation of the head measurement, the standardization is required to determine the position relationship between the head measurement center and the main axis axis. The precision of the standardization directly affects the accuracy of the measurement results. Second, the writing of the measurement procedure. It is necessary to plan reasonable measurement paths and touchpoints based on the detection characteristics, avoiding interference with artifacts or clamps. Modern CAM software already has the ability to automatically generate measurement procedures on machines. Third, thermal compensation. Machines and artifacts can undergo thermal deformation due to ambient temperature, and thermal compensation should be implemented during online measurements to ensure the authenticity of the measurement results. Typically, temperature sensors are installed on machines and the measurement data are corrected based on the Coefficient of thermal expansion.
The future trend of online measurement technology is to develop towards intelligence and integration. Future measurement systems will not only be limited to touch, but will also integrate non-contact sensors such as laser scanning and white light interference, enabling rapid full-field measurements of complex and free surfaces. Measurement data will drive virtual model updates in real time, achieving real-time synchronization of “digital twins”. This will bring mold manufacturing into a whole new era of precision, where any deviation can be immediately detected and corrected, making zero-defect manufacturing possible.
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