Multifunction Spindle With Redundant Angle Sensing and Imbalance Compensation
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Solution Overview
Problem
Multifunction spindles for machine tools face challenges in balancing and positioning accuracy, particularly during polygonal turning, due to insufficient imbalance compensation and reliability issues at higher speeds.
Innovation Solution
The implementation of two independent measurement heads connected to the tool-holding unit, with redundant position angle detection and transmission via two independent paths to a controller, along with a transmission unit that contactlessly powers the measurement heads and includes central media ducts for hydraulic fluid adjustment in annular grooves to compensate imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single measurement system is used in the multifunction spindle, then the device complexity is reduced, but the positioning accuracy and functional reliability deteriorate
Solution Approach 1:
The measurement system is segmented into multiple independent measurement heads, each responsible for specific measurement tasks. This segmentation allows for specialized measurement capabilities while maintaining overall system functionality, resolving the contradiction between complexity and precision.
Solution Approach 2:
The patent implements more measurement capabilities than strictly necessary for basic functionality by incorporating multiple measurement heads and redundant measurement paths. This excessive action ensures high positioning accuracy and functional reliability even under challenging operating conditions.
2Device complexity
If a single measurement system is used in the multifunction spindle, then the device complexity is reduced, but the functional reliability deteriorates
Solution Approach 1:
The patent incorporates redundant measurement paths and multiple measurement heads that provide backup capabilities before failures occur. This beforehand cushioning ensures that if one measurement path fails, the system can continue operating reliably through alternative paths.
Solution Approach 2:
Different measurement heads are positioned and configured with specific local qualities to measure different aspects of the tool-holding unit's position and orientation. This localized specialization enhances overall functional reliability through distributed measurement capabilities.
3Adaptability or versatility
If the tool-holding unit is arranged within the spindle housing and can pivot about an axis perpendicular to the drive shaft, then the spindle becomes multifunctional for various machining operations, but imbalance compensation becomes insufficient at higher speeds
Solution Approach 1:
The patent implements dynamic imbalance compensation by enabling the tool-holding unit to pivot and adjust its position during operation. This dynamic adjustment allows real-time compensation for imbalances that occur at different rotational speeds, maintaining reliability across the full operating range.
Solution Approach 2:
The tool-holding unit is designed with universal capabilities to perform multiple machining operations including turning, boring, milling, and polygonal turning. The pivot mechanism provides universal adaptability while the measurement and compensation systems ensure reliable operation across all functions.
4Measurement precision
If redundant measurement paths are implemented, then the positioning accuracy and functional reliability are improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple measurement paths into a unified evaluation system that processes data from redundant measurement heads. This combining approach maintains high positioning accuracy through redundant measurements while reducing the apparent complexity by integrating the evaluation logic into a cohesive system.
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
This design enhances positioning accuracy and functional reliability by allowing complete imbalance compensation and ensuring safe operation during polygonal turning, improving the spindle's performance and market acceptance.
Implementation Method 1
The transmission unit contactlessly supplies power to at least two connected measurement heads
Implementation Method 2
in each of which grooves an annular segment is arranged which can be supplied via ducts with hydraulic fluid in such a way that its relative position within the annular groove can be adjusted for the purpose of compensation of imbalances
Data Source
AI summary
A multifunction spindle for a machine tool for machining workpieces has a spindle housing, rotational drive, and tool-holding unit. The tool-holding unit is disposed within the spindle housing and pivots relative to the spindle housing about an axis perpendicular to the axis of rotation. The spindle has two measurement heads connected to a transmission path for measuring position angle and enhances positioning accuracy.