Ultrasonic System High-Frequency Vibration Stability
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Solution Overview
Problem
Current ultrasonic machining systems for iron-containing components operate at slow cutting speeds due to limitations in oscillation frequency and amplitude, making them economically viable only in special cases, and face challenges in maintaining stability and efficiency as frequency increases above 100 kHz.
Innovation Solution
Designing an ultrasonic system with an oscillation frequency between 100 and 350 kHz, using piezoceramics in pairs for excitation, and eliminating screw connections by thermal joining or form fitting to ensure consistent amplitude and vibration properties across the entire oscillating system, optimized through simulation and FEM calculations to reduce wavelength-dependent inefficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oscillation frequency is increased above 100 kHz to increase machining speed, then productivity improves, but the wavelength becomes smaller leading to negative influence on vibration properties and amplitude reduction
Solution Approach 1:
The patent changes the coupling method from mechanical screw connections to thermal bonding or form fitting, which fundamentally alters how the piezo exciter and sonotrode are joined. This parameter change eliminates the need for large contact surfaces and allows operation at frequencies above 100 kHz while maintaining stable vibration amplitude, thus resolving the contradiction between increased productivity and maintained manufacturing precision
Solution Approach 2:
The patent replaces the mechanical screw connection system with thermal bonding or form fitting coupling methods. This substitution eliminates the mechanical interface that caused settlement phenomena and amplitude reduction at high frequencies, enabling the system to operate above 100 kHz while maintaining stable vibration properties
2Ease of manufacture
If screw connections are used to join piezo exciter and sonotrode, then ease of assembly improves, but at frequencies above 100 kHz settlement phenomena occur and contact pressure decreases
Solution Approach 1:
The patent replaces mechanical screw connections with thermal bonding or form fitting methods. This substitution eliminates the mechanical interface that caused settlement phenomena and contact pressure loss at high frequencies, thereby improving operational reliability while maintaining manufacturing feasibility through standardized bonding processes
3Manufacturing precision
If the contact surface area is reduced to improve vibration properties at high frequency, then manufacturing precision improves, but the system becomes unstable due to settlement phenomena
Solution Approach 1:
The patent replaces mechanical screw connections with thermal bonding or form fitting methods, which eliminate settlement phenomena entirely. This allows the use of optimally sized contact surfaces that maintain both high vibration amplitude and operational stability, resolving the contradiction between manufacturing precision and reliability
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 approach significantly increases processing speed and maintains vibration amplitude, enhancing the economic efficiency of the cutting process by stabilizing the system and reducing losses at higher frequencies.
Implementation Method 1
a piezoelectric exciter (1) with associated electronics, and a sonotrode (3)... The excitation is carried out by at least one and preferably several piezoceramics installed in pairs
Implementation Method 2
During ultrasonic machining of steel with diamond, this oscillating motion interrupts contact between the tool (diamond) and the material (steel). Diffusion processes that normally occur in the contact surface between the tool and material can thus be reduced
Data Source
Figure 1~4
Figure 5~8
AI summary
The invention relates to an ultrasonic system for cutting and machining processing, comprising a tool (4), a sonotrode (3) and a piezoelectric exciter (1). The invention is characterized in that a resonant frequency of more than 100 and preferably of more than 120 and particularly preferably of more than 150 kHz is applied to the tool (4). The invention further relates to a method for designing an ultrasonic system.