Numerical Control Device Synchronous Tapping Spindle Synchronization
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Solution Overview
Problem
Multi-axis tapping devices struggle to maintain accuracy in synchronous tapping operations when spindles have different machining conditions, as existing systems do not account for variations in tool length, machining hole depth, and pitch, leading to inefficiencies and reduced precision.
Innovation Solution
A numerical control device that associates the rotation and feed of spindles using an associated-synchronous-tapping unit, synchronizing the spindle on the associated side with the spindle on the reference side to account for differences in machining conditions, enabling simultaneous accurate tapping across multiple tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spindles are individually synchronized with a feed shaft independently, then each spindle can operate autonomously, but accuracy in simultaneous synchronous tapping is reduced when spindles have different machining conditions
Solution Approach 1:
The patent merges the synchronization control of multiple spindles by making one spindle (reference spindle) the master and other spindles (associated spindles) the slaves. The associated spindles synchronize their rotation and feed based on the reference spindle's operations, rather than each spindle independently synchronizing with the feed shaft. This combined approach maintains adaptability while improving accuracy in simultaneous synchronous tapping.
2Device complexity
If machining conditions are set the same for all spindles, then the system is simpler to control, but it cannot accommodate spindles with different tool lengths, machining hole depths, and pitches
Solution Approach 1:
The patent applies local quality by allowing each spindle to have its own specific machining conditions (tool length, machining hole depth, pitch) while maintaining a hierarchical control structure. The reference spindle sets the baseline conditions, and associated spindles have locally adjusted parameters to accommodate different machining requirements, thus achieving both simplicity and adaptability.
Solution Approach 2:
The patent enables parameter changes by allowing different spindles to operate with varying machining conditions such as different tool lengths, machining hole depths, and pitches. The control system adjusts these parameters for associated spindles based on the reference spindle's operations, facilitating adaptability without excessive complexity.
3Adaptability or versatility
If through-holes and holding plates are changed to correspond to different workpiece portions, then spindle disposition can be changed, but the number of components increases
Solution Approach 1:
The patent applies dynamics by making the spindle disposition changeable through dynamic reconfiguration rather than static multiple component sets. The system can adapt spindle positions and configurations dynamically to match different workpiece portions, reducing the need for multiple physical through-holes and holding plates while maintaining adaptability.
Data Source
AI summary
A numerical control device is the numerical control device that controls a machine tool including a plurality of spindles that each rotate a tool opposed to a workpiece around a tool axis relative to the workpiece and a feed shaft that performs a feed operation such that a plurality of the tools relatively move closer to a plurality of the workpieces, and the numerical control device includes an associated-synchronous-tapping unit that associates, according to an associated-synchronous-tapping command, rotation and feed of a spindle on an associated side among the spindles with rotation and feed of a spindle on a reference side among the spindles and simultaneously performs synchronous tapping with the tools.