Tilting Head Position Controller Center Error Correction
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Solution Overview
Problem
Conventional machining centers face challenges in accurately and automatically correcting the center error of the tilting head, which leads to position errors and reduced manufacturing accuracy due to manual detection and correction processes, increasing costs and time for preparation.
Innovation Solution
A position controller that automatically detects and corrects the center error of the tilting head using a built-in offset detector, performing rotational transforms to generate error vectors and drive the tilting head to align the control center with the actual center, eliminating the need for additional center error detectors and manual processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual detection and correction processes are used for center error of the tilting head, then the preparation process is simple, but the manufacturing accuracy decreases and preparation time increases
Solution Approach 1:
The system uses the existing built-in offset detector to automatically detect and correct the center error of the tilting head without requiring external检测设备 or manual operations. The numerical controller automatically calculates correction values and adjusts the rotation center coordinates, making the system self-correcting and eliminating the need for separate center error detection equipment or manual procedures
Solution Approach 2:
The patent replaces manual mechanical detection and correction processes with an automated computational system. The numerical controller uses coordinate transformation algorithms and rotational mathematics to automatically calculate center error and generate correction values, substituting human operators and manual measurement tools with an automated control system that integrates with the existing offset detection capability
2Measurement precision
If additional center error detectors are installed to improve detection accuracy, then the measurement precision improves, but the device complexity and costs increase
Solution Approach 1:
The patent makes the built-in offset detector serve multiple functions: it detects both tool offset errors and center error of the tilting head. By utilizing the same detector for both purposes through different measurement procedures and coordinate transformations, the system eliminates the need for separate center error detection equipment while maintaining high measurement precision
Solution Approach 2:
The patent combines the center error detection function with the existing offset detection system. The numerical controller integrates both detection purposes into a unified automated process, where the same hardware detector performs both tool offset measurement and center error measurement through different operational sequences and calculation methods
3Productivity
If manual correction processes are used for center error, then the operation process is simple, but the productivity decreases and preparation time increases
Solution Approach 1:
The system automatically detects center error, calculates correction values through coordinate transformation, and updates the rotation center coordinates without requiring manual intervention. The numerical controller performs all calculations and adjustments autonomously, significantly reducing preparation time and improving productivity while maintaining operational simplicity through automated control
Solution Approach 2:
The system implements an automated feedback loop where the offset detector measures the actual position, the numerical controller calculates the center error based on measured data and rotational angles, generates correction values, and applies them to update the rotation center coordinates. This closed-loop feedback system automatically improves accuracy without manual intervention
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
Disclosed is a position controller for a tilting head in a machining center. The position controller includes an offset attachment having a body combined to the tilting head and a spherical contact secured to the body, an offset detector built in the machining center such that the offset detector move out into a process area of the machining center and automatically detects a tool offset from a contact point with the spherical contact, a storing unit individually storing first and second tool offsets by respective rotation positions of the tilting head, and an operator generating a transform offset of the first tool offset by a rotational transform and a center error vector from the transform offset and the second tool offset. Accordingly, the center error of the tilting head is automatically detected and corrected in the machining center.