Spindle Chuck Measurement Using Operation Rod Feedback
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Solution Overview
Problem
Machine tools lack the capability to simultaneously measure the dimension of a workpiece during the holding or delivery process, leading to potential errors in workpiece positioning and processing, and do not effectively detect malfunctions in the chuck mechanism.
Innovation Solution
A machine tool with a hollow spindle, chuck claws, and a measuring apparatus that uses a stroke sensor to detect the movement of an operation rod, converting it into the opening dimension of the chuck claws, allowing for real-time measurement and detection of accurate workpiece holding and potential chuck malfunctions, with a storage unit for comparison and analysis of dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hollow spindle with operation rod is used to enable chuck opening/closing motion, then the chuck mechanism can be actuated, but the capability to simultaneously measure workpiece dimensions during holding or delivery is lost
Solution Approach 1:
The operation rod is designed to serve dual functions: actuating the chuck opening/closing mechanism and serving as a measurement target for detecting workpiece dimensions. By making the operation rod movable relative to the spindle body, it can simultaneously transmit mechanical motion to the chuck and provide positional information for measurement, eliminating the need for separate measurement devices and resolving the contradiction between measurement capability and device complexity.
2Reliability
If the operation rod is moved to open/close chuck claws, then the workpiece holding function is achieved, but real-time detection of workpiece holding accuracy and chuck malfunction is not possible
Solution Approach 1:
A detection device is installed to monitor the positional information of the operation rod in real-time during chuck opening/closing operations. This feedback mechanism allows the system to detect whether the operation rod reaches the expected positions for workpiece holding and release, enabling real-time verification of holding accuracy and detection of chuck malfunctions without adding complex measurement equipment.
3Measurement precision
If separate measurement devices are added to measure workpiece dimensions, then measurement capability is improved, but the complexity of the spindle system increases
Solution Approach 1:
The operation rod serves as both the actuator for chuck opening/closing and the measurement target for dimension detection. By utilizing the existing movable component (operation rod) for dual purposes, the system achieves workpiece dimension measurement capability without adding separate measurement devices, thus avoiding increased system complexity while maintaining measurement precision.
Data Source
AI summary
A machine tool includes: a hollow spindle including a hollow portion along an axial direction; a plurality of chuck claws openably mounted at a distal end portion of the hollow spindle, and configured to hold a workpiece; an operation rod inserted into the hollow portion of the hollow spindle in a movable manner, and configured to close the plurality of chuck claws with movement of the operation rod toward one side in the axial direction and open the plurality of chuck claws with movement of the operation rod toward the other side in the axial direction; and a measuring apparatus configured to measure an opening dimension of the plurality of chuck claws based on a movement amount of the operation rod.