Variable-Frequency Ultrasonic Milling for Complex Surface Accuracy
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Solution Overview
Problem
Existing ultrasonic-assisted milling processes face inefficiencies and tool wear when machining complex curved surfaces with constant frequency and amplitude, leading to reduced surface accuracy and increased labor costs due to the need for sectional machining.
Innovation Solution
A variable-frequency ultrasonic machining system for CNC milling machines that includes a processor to detect real-time cutting force and temperature, adjusting spindle speed, feed rate, and ultrasonic vibration frequency to adapt to changing machining conditions, ensuring continuous high-speed machining of complex surfaces with improved accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant frequency and amplitude ultrasonic vibration is used during continuous machining, then machining process is simple and stable, but cutting force increases gradually leading to reduced surface accuracy and tool breakage
Solution Approach 1:
The patent implements dynamic adjustment of ultrasonic vibration frequency and amplitude during the machining process. The control system continuously monitors machining conditions and automatically varies the ultrasonic parameters in real-time, transforming the static constant-frequency system into a dynamic adaptive system that maintains optimal cutting conditions throughout the machining process.
Solution Approach 2:
The patent changes the physical parameters of ultrasonic vibration (frequency and amplitude) during machining to adapt to varying cutting conditions. By modifying these parameters dynamically, the system prevents excessive cutting force accumulation and maintains surface accuracy without requiring complex sectional machining procedures.
2Manufacturing precision
If sectional machining is adopted to maintain surface accuracy, then surface machining accuracy is maintained, but machining time increases and labor cost increases
Solution Approach 1:
The patent enables continuous machining operations by dynamically adjusting ultrasonic parameters throughout the entire machining process. This eliminates the need to stop and restart for different sections, maintaining continuous material removal while adapting to changing conditions, thereby preserving both surface accuracy and high productivity.
Solution Approach 2:
The patent implements a feedback control system that continuously monitors machining conditions and adjusts ultrasonic parameters accordingly. This closed-loop control allows the system to maintain surface accuracy through real-time parameter optimization rather than through discrete sectional machining operations, improving overall efficiency.
3Reliability
If constant speed and feed rate are used in CNC machine, then control system is simple, but cutting force increases leading to tool wear and breakage
Solution Approach 1:
The patent employs feedback control where the system monitors cutting conditions and automatically adjusts speed and feed rate parameters. This feedback mechanism allows the control system to respond to changing machining conditions, preventing excessive tool wear and breakage while maintaining reasonable system complexity through automated control.
Solution Approach 2:
The patent transforms the static constant-speed control system into a dynamic system that continuously adjusts speed and feed rate based on real-time machining conditions. This dynamic adaptation extends tool life by preventing overload conditions without requiring overly complex control architecture.
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
The system effectively maintains surface machining accuracy and increases machining efficiency by dynamically adjusting parameters in response to cutting forces and temperatures, reducing tool wear and labor costs associated with traditional methods.
Implementation Method 1
a wireless transmission transmitting winding unit, fixed around the connecting shaft; a wireless transmission receiving winding unit, connected to the connecting shaft, and spaced apart from the wireless transmission transmitting winding unit located above
Implementation Method 2
a transducer, connected to the shaft of the cutter shaft drive motor, where power of the transducer is connected from the wireless transmission receiving winding unit and introduced through the hollow shaft of the cutter shaft drive motor
Implementation Method 3
a horn, where an upper end of the horn is connected to the transducer, and a lower end thereof is connected to the milling cutter shaft
Data Source
AI summary
A variable-frequency ultrasonic machining system for a computer numerical control milling machine including a cutting force detection unit, a temperature sensing unit and a processor. The processor receives sensing signals of the cutting force detection unit and the temperature sensing unit, processes the received sensing signals according to a set program, and sends control signals to an ultrasonic drive power supply and a corresponding servo motor, respectively. By adjusting the ultrasonic vibration frequency or the frequency of the frequency converter of the CNC milling machine in the machining process, the system ensures the continuity of ultrasonic-assisted milling of a part with a complex curved surface in case of uneven cutting allowance, and improves efficiency of ultrasonic machining.