Rotary Table Clamping Cycle Time Reduction
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Solution Overview
Problem
Traditional machine tools with rotary tables experience inefficiencies in clamping and unclamping operations due to variable processing times, leading to extended cycle times as they rely on constant clamping mechanism operation times without accounting for feedback signal processing and next operation timing.
Innovation Solution
A machine tool with a rotary table that includes a clamping mechanism operation time measuring unit, storage unit, and actual operation time calculating unit, which determines and adjusts the clamping mechanism operation time based on measured and stored data to synchronize clamping/unclamping operations with the numerical controller, thereby optimizing cycle times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the machine tool waits for sensor completion signal before starting next operation, then operational reliability is ensured, but cycle time is extended due to processing delays
Solution Approach 1:
The numerical controller pre-calculates and stores the actual clamping mechanism operation time Tb by measuring the difference between total operation time Ta and processing time Tc. This preliminary determination of actual operation time allows the controller to issue clamp/unclamp commands in advance, eliminating the need to wait for sensor completion signals before starting the next operation, thus reducing cycle time while maintaining reliability
Solution Approach 2:
The system uses sensor feedback to detect completion of clamping operations, but goes beyond traditional feedback by measuring and storing the actual operation time Tb. This feedback mechanism enables the numerical controller to optimize future command timing based on historical performance data, reducing processing delays while ensuring operational reliability
2Device complexity
If the machine tool uses constant clamping mechanism operation time, then control simplicity is maintained, but productivity is reduced due to inability to account for processing delays
Solution Approach 1:
The system pre-measures and stores the actual clamping mechanism operation time Tb during initial operations. This preliminary data collection enables subsequent operations to use optimized timing based on real performance rather than constant estimates, improving productivity without significantly increasing control complexity
Solution Approach 2:
The system transitions from using a constant clamping mechanism operation time parameter to using a dynamically determined actual operation time Tb stored in memory. This parameter change allows the numerical controller to adapt command timing to actual machine performance, eliminating processing delays and improving operational efficiency
Data Source
AI summary
A machine tool includes a rotary table on which a workpiece is mounted, a clamping mechanism for clamping the rotary table against rotation, and a sensor for detecting completion of a clamping operation of the clamping mechanism. A numerical controller for controlling the machine tool calculates the time required for actual operations of the clamping mechanism, taking into account beforehand the processing time for processing a feedback signal from a sensor and the time until the next operation of the machine tool. By controlling the clamping mechanism based on the calculated required time, the cycle time of clamping or unclamping operations is shortened.