Dual-Spindle Chuck Vibration Detection for Machining Accuracy
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Solution Overview
Problem
Machine tools with first and second spindles and chucks face accuracy issues in machining due to abnormalities like chip biting during the fastening operation from the second chuck.
Innovation Solution
A machine tool configuration with a detector using vibration measurement data from the first and second chucks to detect abnormalities caused by the fastening operation, allowing for continuous synchronized rotation and machining when no abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second chuck performs a fastening operation for fastening the work to the second chuck, then the work can be securely held for machining, but abnormalities such as chip biting may occur that compromise machining accuracy
Solution Approach 1:
The vibration detection is performed during the fastening operation itself, before the machining operation begins. This preliminary detection allows the system to identify abnormalities such as chip biting in the fastening process before they can affect machining accuracy, enabling preventive action to be taken.
Solution Approach 2:
The detection unit provides real-time feedback about the fastening operation by monitoring vibration of the second chuck. This feedback mechanism allows the control unit to detect abnormalities during the fastening process and respond accordingly, preventing compromised machining accuracy.
2Reliability
If vibration detection is performed during the fastening operation, then abnormalities can be detected early, but the detection system adds complexity to the machine tool
Solution Approach 1:
The system uses the machine tool's own existing vibration characteristics during normal operation as the basis for detection. Rather than adding complex external sensing systems, the invention leverages the inherent vibration data already present in the fastening operation, processed through the control unit's analysis capabilities.
Solution Approach 2:
The control unit serves multiple functions: it controls the fastening operation, monitors vibration data, detects abnormalities, and makes decisions about continuing or stopping the operation. This multi-functionality reduces the need for separate dedicated detection hardware, thereby limiting the increase in device complexity.
3Productivity
If the spindles are rotated in synchronization during the fastening operation, then continuous machining can be maintained, but the control complexity increases
Solution Approach 1:
The synchronization control merges the rotation control of the first and second spindles into a coordinated operation. By controlling the spindles to rotate in synchronization during the fastening operation, the system maintains continuous rotation and machining capability without requiring separate independent control systems for each spindle.
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
Effectively detects abnormalities in the fastening operation, ensuring the accuracy of machining by allowing continuous operation when no issues are detected.
Implementation Method 1
a detector configured to detect an abnormality caused by the fastening operation by the second chuck, based on measurement data associated with a vibration of at least one of the first chuck and the second chuck
Data Source
AI summary
A machine tool (1) includes: a front spindle (10) having a front chuck (12); a rear spindle (20) having a rear chuck (22); a controller (50) configured to cause the rear chuck (22) to perform a fastening operation for fastening a work (W) fastened to the front chuck (12) to the rear chuck (22); and a detector (60) configured to detect an abnormality caused by the fastening operation by the rear chuck (22), based on measurement data associated with a vibration of at least one of the front chuck (12) and the rear chuck (22).