Papers by Keyword: Process Parameter

Abstract: With the demand of high-quality and aesthetical products in the domain of medical microbiology, it’s more and more important to join micro weld. Due to traditional joining methods’ difficulty in meeting the demands, laser transmission micro-joining is of great significance. The materials used to laser transmission micro-joining based on the mask are PET, and the experiments are conducted on diode laser. The weld geometry with different gap widths on the mask is demonstrated at the same process parameters. In addition, the causes of forming different morphologies are analyzed. The formation mechanism of weld is analyzed as well. Moreover, process parameters’ effects on joint strength and joint width are deeply explored when gap width on the mask is 0.3mm. The results show that100 um micro weld joint is realized. At the same time, the range of process parameters is determined.

Abstract: This article uses semiconductor laser for mask assisted laser transmission micro joining PET and PET with clear weld absorbents, the mask slit width is 0.3mm, using CCD to plan experimental design. The mathematical model of joining process parameters with joint strength and joint width was established using response surface methodology. Experimental verification was also done. The actual joint width was compared to mask slit width and the process parameters were optimized. The results show that the mathematical model can response the relationship between process parameters and joining quality, the mask can effectively control the joint width, reasonable process parameters can obtain high-precision, high-intensity joining quality.

Abstract: Top spray granulation process is a common technique used widely in pharmaceutical, food and special chemical modification for fertilizer manufacturing. Nevertheless, there is still a lack of studies regarding to the description of controlled parameters with dynamic correlation in targeting to produce urea granules. Thus, this research was carried out to introduce the crucial applied process parameters using top spray technique for paddy urea fertilizer production.The acquisition process parameter readings were verified by obtained yield of urea granules (UG) which featured as an optimum particle diameter size from 2 mm to 6 mm with reasonable hardness (crush strength) in range 2.0 kg/granule to 4.0 kg/granule, these criteria were required as a slow - release mechanism during soil adsorption interaction in paddy field to reduce amount of fertilizer consumption. Three significant parameters have been selected namely as air inlet temperature, the viscosity of binder solution and rate of top spraying from starch liquid binder to generate greater UG size from wet granulation interaction with smooth coalescence and consolidation growth . The data classification was screened by One-Factor-at-a-Time (OFAT) 101 method and supported by 2 levels and 3 factors (2³ ) of full factorial design for clear description to vindicate the critical parameter required during urea granulation using fluidized bed granulator corresponds to low energy consumption and economical process. The obtained parameter readings and findings of UG features were useful to be applied further for detail investigation on next stage regarding to agglomeration profile and mechanism using CCD camera and PDA monitoring devices.

Abstract: Based on chemical vapor deposition (CVD) reaction and numerical analysis of the transmission process, analysis the influence law of the process parameters has been conducted for silicon carbide thin film. A detailed analysis on impact of the chamber pressure, substrate temperature and inlet flow has been realized through the use of CFD and chemical reactions software, coupling fluid flow, chemical reactions and mass transfer process in the deposition of SiC thin film. The result of simulation fully proved that the process parameters have different influence law, especially the chamber pressure.

Abstract: In this paper, coaxial inside-beam powder feeding technique was used. According to theoretical analysis and the single layer cladding experiments, the initial parameters and experimental scheme of width-changing layer cladding based on the coaxial inside-beam powder feeding were confirmed. The theory model of piecewise transition was established. The real-time control of scanning speed and the defocus amount to carry out the experiments were used while the laser power and powder feed rate were not changed. Finally, the layers with uniformly width changing and stable layer height were achieved. Performance analysis showed that the formed layer had smooth surface and a high rigidity without powder paste outside the surface, and the size was basically as same as the design value. Its microstructure was small and dense and good metallurgical combination was formed between part and substrate.

Abstract: Plasma powder spray welding method is used for depositing successive layers of metal, which forms a 3-Demensional (3D) solid component. Fe45 alloy powder is chosen to spray welding on Q235 steel. Welding process parameters of plasma powder spray welding are studied, which affected the performance of carbon steel weld layer. Then changes of alloy powder spray welding and influences of weld microstructure after spray welding are analyzed. Experiments results show that in the case of only changing transferred arc current, the microstructure and mechanical properties of the weld is obviously better, grain size distributes uniformity, and hardness is moderate.

Abstract: In order to improve the quality of sample and decrease the stress during process, it is important to study the residual stress distribution during direct laser metal deposition (LMDS) process. In this paper, according to the “element life and death” technique of finite element method ,with APDL, we simulated the effects of Laser power, scanning velocity, substrate preheat temperature and powder addition speed in top layer of samples residual stress distribution during whole LMDS process are studied. The residual stress distribution under different process parameters is researched in detail. Using the same process parameters, the simulation results show good agreement with the features of sample which fabricated by LMDS.

Abstract: In 1960 the first ruby laser came out , after 40 years’ development, laser engraving technology has been widely used in various areas. This paper describes the characteristics of laser engraving, the advantages and applications in industries and study images of laser engraving key technologies in-depth from image processing, laser engraving process parameters and clean carbide processing , and JK-2030 CO₂ laser engraving machines on paulownia color photos as examples for authentication, making laser engraving images more easily and efficiently .

Abstract: In this work the significance of important parameters such as Blank temperature, Blank hold force on limiting drawing ratio (LDR) of IS513 CR3 steel sheets during warm deep drawing was determined. Influence of these parameters was analyzed at three different forming speeds. Experimental results proved that the blank temperature has a higher influence on LDR compared with other parameters especially at low forming speed.

Abstract: In regular electrical upsetting process, the process parameters were determined by the experience. During working, these parameters were constant and could not be controlled online. In this paper a new proportionate valve and various velocity top anvils, electrical upsetting system is introduced. Based on the bulb temperature measured at the time of operation proportionate valve will vary the upset pressure to obtain the bulb without crack or fold. The control strategy includes two key parts: sensing the temperature and controlling it by varying the power intensity in the circuit through controlling the upset pressure. And the different anvil position and anvil velocity will be used to change the bulb shape based on the valve profile. This control strategy also includes two key parts: Velocity of anvil is directly proportional to height of bulb, in various positions various velocity will be used to form a different shape of bulb without defects.