Cu박판의 초음파 금속 용착 실험을 통한 용착성 평가

박우열(Woo Yeol Park),장호수(Ho Su Jang),김정호(Jung Ho Kim),박동삼(Dong Sam Park) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.4

The Ultrasonic metal welding is used in the solid-phase welding method at room temperature or low temperature state. In welding process, the high frequency vibration energy is delivered to the welding part under the constant pressure for welding. In this study, we aimed to design and manufacture a 40,000 Hz band horn through finite element analysis. By performing modal analysis and harmonic response analysis, the modal analysis result is that the horn frequency was 39,599Hz and the harmonic response result that the horn frequency was 39,533Hz. These results were similar. In order to observe the designed horns performance, about 4,000 voltage data was obtained from a light sensor and was analyzed by FFT analysis using Origin Tool. The result RMS amplitude was approximately 8.5㎛ at 40,000Hz, and maximum amplitude was 12.3㎛. Using this manufactured horn along with an ultrasonic metal welder and tension tester, the weldability of Cu sheets was evaluated. The maximum tensile force was 66.53 N in the welding condition of 2.0 bar pressure, 60% amplitude, and 0.32s welding time. In excessive welding conditions, it was revealed that weldability is influenced negatively.

초음파 식품 컷팅용 공구의 설계

박우열(Woo-Yeol Park),장호수(Ho-Su Jang),김정호(Jung-Ho Kim),박동삼(Dong-Sam Park) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3

The ultrasonic cutting method is which cutting by applying high frequency vibrational energy into specific area at constant pressure. Ultrasonic cutting is consisted of power supply, transducer, booster and cutting tool. Precise designing is required since each part"s shape, length and mass can affect driving frequency and vibration mode. This paper focused to cutting tool design, its length L was set by calculating vibration equation. And the value of the shape parameter a was diversified as the integral multiple and the result of 40,189Hz the analysis of Modal was shown in the length 30mm of the result of performance b in the 11th mode Also by performing harmonic response analysis, the frequency response result was 40,189Hz, which was similar to modal analysis result.

초음파 컷팅용 Tool의 설계 및 해석

박우열(Woo Yeol Park),장호수(Ho Su Jang),박동삼(Dong Sam Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

The cutting method using the ultrasonic wave which cutting by applying high frequency vibrational energy into specific area at constant pressure. The performance of the Cutting tool is normally relevant to the resonance at the operating frequency and the vibration amplitude, the uniformity of the amplitude on output surface. this paper proposes a design procedure of the cutting Tool using vibration equation and FEM. We calculated and analyzed the natural frequency to find the optimal design by the modal analysis and harmonic analysis using ANSYS.

초음파 금속 용착기를 이용한 Cu 박판의 접합성 평가

박우열(Woo-Yeol Park),장호수(Ho-Su Jang),박동삼(Dong-Sam Park) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2

Ultrasonic metal welder is consisted of power supply, transducer, booster, and horn. Precise designing is required since each part"s shape, length and mass can affect driving frequency and vibration mode. This paper gives a description of an experimental study of the ultrasonic welding of metals. A horn suitable for 40,000Hz was attached to the ultrasonic metal welder in order to weld Cu sheet. The Cu sheet welding was done with different amplitude, pressure and welding time, and its maximum tension was measured. Maximum tension of 177.99N was obtained when the pressure was 2.5bar, amplitude was 80%, and welding time was 0.34sec. Therefore, excessive welding condition negatively influences maximum tension measurement result.

초음파 금속 용착용 40kHz 혼의 설계와 용착성 평가

장호수(Ho Su Jang),박우열(Woo Yeol Park),박동삼(Dong Sam Park) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.2

The horn is a key part of the ultrasonic welder. As the shape, mass and material of a horn have effects on the resonant frequency and the vibration mode in ultrasonic welding, a horn has to be designed and manufactured accurately. In this study, 40kHz band horn was designed and manufactured through the vibration mode and finite element analysis. A result of modal analysis showed that the natural frequency of the horn was 39,794Hz, and the frequency response by a harmonic response analysis was 39,800Hz - close to the intended frequency, 40kHz. In addition, weldability of the developed horn was estimated by welding of two Ni sheets and tensile-shear test of welded samples. It was shown the developed horn could be used in metal sheet welding.

초음파를 이용한 컷팅 Tool의 해석

장호수(Ho Su Jang),박우열(Woo Yeol Park),박동삼(Dong Sam Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

The cutting method using the ultrasonic wave which cutting by applying high frequency vibrational energy into specific area at constant pressure. Ultrasonic cutting is consisted of power supply, transducer, booster, and cutting tool. Precise designing is required since each parts shape, length and mass can affect driving frequency and vibration mode. This paper focused to cutting tool design, its length L was set by Calculating vibration equation. And the value of the shape parameter b was diversified as the integral multiple and the result of 39,863Hz the analysis of Modal was shown in the length 22mm of the result of performance b in the 11th mode Also by performing harmonic response analysis, the frequency response result was 39,867Hz, which was similar to modal analysis result.

초음파 금속 용착용 반파장 혼의 설계

장호수(Ho-Su Jang),박우열(Woo-Yeol Park),박동삼(Dong-Sam Park) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1

Ultrasonic metal welding is one of the welding methods which welds metal by applying high frequency vibrational energy into specific area at constant pressure, avaliable in room temperature and low temperature. Ultrasonic metal welder is consisted of power supply, transducer, booster, and horn. Precise designing is required since each parts’ shape, length and mass can affect driving frequency and vibration mode. This paper focused to horn design, its length L was set to 62㎜ by calculating vibration equation. By performing modal analysis with various shape variable b times integer, when length of b is 30㎜ the output was 39,599㎐ at 10th mode. Also by performing harmonic response analysis, the frequency response result was 39,533㎐, which was similar to modal analysis result. In order to observe the designed horn’s performance, about 4,000 voltage data was obtained from a light sensor and was analyzed by FFT analysis using Origin Tool. The result RMS amplitude was approximately 8.5㎛ at 40,000㎐, and maximum amplitude was 12.3㎛. Therefore, it was verified that the ultrasonic metal welding horn was optimally designed.

초음파 금속 용착용 공구혼의 설계 및 해석

장호수(Ho Su Jang),박우열(Woo Yeol Park),박동삼(Dong Sam Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

Ultrasonic metal welding is one of the welding methods which welds metal by applying high frequency vibrational energy into specific area at constant pressure, avaliable in room temperature and low temperature. Ultrasonic metal welder is consisted of power supply, transducer, booster, and horn. Precise designing is required since each parts’shape, length and mass can affect driving frequency and vibration mode. This paper focused to horn design, its length L was set to 62mm by calculating vibration equation. By performing modal analysis with various shape variable b times integer, when length of b is 30mm the output was 39,599Hz at 10th mode. Also by performing harmonic response analysis, the frequency response result was 39,533Hz, which was similar to modal analysis result.

파우더 블라스팅을 이용한 바이오센서의 성형

장호수(Ho Su Jang),박우열(Woo yeol Park),우창기(Chang-Ki Woo),박동삼(Dong Sam Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4

In this study, micro reactor and micromixer of LOC are machined on fused silica glass via powder blasting, a mechanical etching process, and the machining characteristics of the channels are experimentally evaluated. In the process, material removal is performed by the collision of micro abrasives injected by highly compressed air on to the target surface. This approach can be characterized as an integration of brittle mode machining based on micro crack propagation. Fused silica glass, a high purity synthetic amorphous silicon dioxide, is selected as a workpiece material. It has a very low thermal expansion coefficient and excellent optical qualities and exceptional transmittance over a wide spectral range, The powder blasting process parameters affecting the machined results are injection pressure, abrasive particle size and density, stand-off distance, number of nozzle scanning, and shape/size of the required patterns. In this study, the influence of the number of nozzle scanning, abrasive particle size, and pattern size on the formation of micro channels is investigated. Machined shapes of microchannels are measured using a 3-dimensional vision profiler and the results are discussed.

초음파 금속 용착을 위한 공구혼의 최적설계

장호수(Ho-Su Jang),박우열(Woo-Yeol Park),박동삼(Dong-Sam Park) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.3

Ultrasonic metal welding can be used to weld different metals together safely and precisely, without solder, flux and special preparation. Ultrasonic metal welding machine consists of a power supply, a transducer, a booster and a horn. This paper designed the horn needed for Ultrasonic metal welding. The horn has to be designed and manufactured accurately, because measurements such as the shape, length, mass and etc. have effects on the resonant frequency and the vibration mode. The designed horn has the feature of 40,000㎐ of nature frequency, and maximizes vibration range in the Tip by resonance in the frequency of ultrasonic wave machine. In this paper, we calculated and analyzed the natural frequency to find the optimal design of the horn that had the amplitude about 12㎛ by the modal analysis and harmonic analysis using ANSYS. And we analyzed FFT analysis of the manufactured horn.