Drive Axis Gain Switching for CNC-PMC Synchronization
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Solution Overview
Problem
Existing operation control devices face challenges in synchronizing drive signals from CNC and PMC systems, leading to synchronization errors and reduced processing speed when machining workpieces.
Innovation Solution
An operation control device that combines drive signals from PLC and NC systems to calculate positional errors and gain values, allowing for synchronized operation of drive axes and improved processing speed by adjusting gain values and drive speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If drive signals from CNC and PMC systems are simply superimposed on each other, then both control systems can operate, but synchronization errors occur and proper operation cannot be achieved
Solution Approach 1:
The patent introduces a signal combination unit that acts as an intermediary between the CNC system and PMC system drive signals. This unit properly combines the two drive signals before they are sent to the drive axis, ensuring that both control systems can operate simultaneously without causing synchronization errors. The intermediary unit coordinates the signals to maintain proper timing and synchronization relationships.
2Reliability
If gain of the servo axis is set to coincide with gain of the spindle, then synchronization error decreases, but processing speed lowers
Solution Approach 1:
The patent applies dynamics by making the gain value adjustable rather than fixed. The gain value calculation unit dynamically calculates appropriate gain values based on the relationship between the servo axis and spindle, allowing the system to adapt gain settings to different operating conditions. This enables the system to maintain synchronization accuracy while optimizing processing speed, as the gain can be increased when synchronization errors are minimal and decreased when they become significant.
3Productivity
If drive speed of the first drive axis is switched to increase processing speed, then productivity increases, but synchronization error may occur
Solution Approach 1:
The patent implements feedback through the gain value calculation unit, which continuously monitors the relationship between the servo axis and spindle and adjusts the gain value accordingly. When the drive speed of the first drive axis is switched to increase processing speed, the feedback mechanism detects any resulting synchronization errors and compensates by adjusting the gain value to maintain proper synchronization, thus allowing high-speed operation without sacrificing synchronization accuracy.
Data Source
AI summary
Provided are an operation control device and program that can improve processing speed while suppressing the occurrence of synchronization errors. This operation control device uses a synthesis drive signal obtained by synthesizing two drive signals to drive by switching a drive speed of a first drive shaft, and uses one of the synthesized drive signals to drive a second drive shaft for performing a task different from the first drive shaft. The operation control device comprises: a positional deviation calculation unit for calculating a positional deviation of the first drive shaft before switching the driving speed of the first drive shaft and calculating a positional deviation of the second drive shaft; and a gain value calculation unit for calculating a gain value of the first drive shaft after switching the operating speed, on the basis of the drive speed of the first drive shaft before switching the operating speed, the calculated positional deviation of the first drive shaft, and the calculated positional deviation of the second drive shaft.