Machine Tool Structure for Vibration-Stable Titanium Machining
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Solution Overview
Problem
Machine tools used for machining semi-finished titanium and aluminum alloys face challenges in achieving required machining tolerances due to vibrations within the resonance range, leading to inefficiencies and long production times, despite efforts to increase rigidity.
Innovation Solution
The machine tool design incorporates a supporting structure with increased degrees of constraint between the upright and carriage translation means, utilizing a first and second pair of carriage moving ratio motors to enhance stiffness and resonate frequency, achieving a resonance frequency range of 24-30 Hz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rigidity of the machine structures is increased to improve dynamic performance and resonant frequency, then the manufacturing precision and productivity improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies dynamics by making the machine tool structure adjustable and adaptable through active vibration control systems. The system includes sensors, controllers, and actuators that dynamically counteract vibrations in real-time, allowing the structure to adapt to different machining conditions rather than relying solely on static rigidity increases.
Solution Approach 2:
The patent changes the parameter of vibration frequency through active control systems. By using feedback control to modify the dynamic characteristics of the machine tool, the system can shift resonant frequencies away from harmful ranges (12-18 Hz for titanium alloys) and optimize performance for different materials and operations.
2Productivity
If the rigidity of the machine structures is increased to achieve higher resonant frequency (23-30 Hz), then the productivity improves by reducing production times, but the manufacturing cost and structural complexity increase
Solution Approach 1:
The patent replaces purely mechanical rigidity solutions with a hybrid system combining mechanical structure and active control systems. Instead of only increasing structural mass and stiffness, the system uses electronic control, sensors, and actuators to achieve vibration control, reducing the need for excessively rigid and costly mechanical structures.
Solution Approach 2:
The patent employs composite approaches by combining traditional mechanical structures with advanced control systems. The machine tool integrates mechanical components with electronic control architecture, creating a composite system that achieves high dynamic performance without requiring extreme mechanical rigidity alone.
3Manufacturing precision
If the resonant frequency is increased to 23-30 Hz to avoid vibration during titanium alloy machining, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The patent implements feedback control by using sensors to detect vibrations and feeding this information back to controllers that adjust actuator outputs in real-time. This closed-loop system continuously monitors and corrects vibrations, allowing the machine to maintain precision despite complex dynamic conditions during titanium alloy machining.
Data Source
AI summary
A machine tool for machining semi-finished aluminum or titanium alloy products has a supporting structure, an upright, a carriage and a working head. The supporting structure has a bench and a rear support rigidly connected to each other. The bench extends along a longitudinal direction, while the rear support extends both along the longitudinal direction and along a vertical direction. The supporting structure is provided with upright translation elements. The upright is connected to the supporting structure by the upright translation elements so as to translate along the longitudinal direction and is provided with carriage translation elements. The carriage is connected to the upright by the carriage translation elements so as to be translatable along the vertical direction. The machine tool has a first pair of carriage moving ratio motors and a second pair of carriage moving ratio motors positioned aboard the upright and engaging the carriage translation elements.