Advanced Materials Research Vols. 148-149

Abstract: In this paper, Newton iterative calculation is adopted for the solution of non-line equation, which reverse calculation value of strip deformation resistance for process control of cold rolling as variable. The calculation speed, stability and accuracy of this algorithm are analyzed. The practical application verifies that Newton iterative calculation can meet the requirement of non-line calculation of process control of cold rolling.

Abstract: Cemented carbide has relatively good mechanical properties, so it is widely used as cutting tools. In this paper, a sliding wear test at high ambient temperature between cemented carbide tool material and ceramic was carried out using a ball-on-disc wear-test machine. The characteristics as to wear rate and friction coefficient were investigated. The special wear rate increased with an increase in operating temperature. The cemented carbide material with addition of TiC phase gave better wear resistance than cemented tungsten carbides at elevated temperature. SEM technology was adopted to observe the worn surfaces of specimens and wear mechanism were simultaneously discussed.

Abstract: For the purpose of acquiring IC micro-topography accurately, fuzzy gray theory is used for quantitative evaluating the influence factors of IC chip’s image characteristics. Through selecting different influence factors in the process of image acquiring and establishing the factor-parameters array, a mathematical model of fuzzy gray evaluating system is structured. After calculating the fuzzy gray relational degree between the factor-parameters and the image characteristics, the external influence on image is quantized. By experiment and comparison the relational degree is quantitative analyzed and the influence tendency is chart-illustrated, thus research conclusions and referential suggestions are reached. It provides theoretical foundation and technical preparation for IC image sampling condition’s selection and adjustment.

Abstract: A high-pressure absorption method can realize separation of H2 from CO2 since they have different solubility in high-pressure water. The gas-liquid equilibrium model of hydrogen production from glucose gasification in supercritical water based on the modified SAFT model and SAFT equation of state was developed to predict the effect of absorber’s pressure on the molar fraction of product gases in gas phase, absorption rate in liquid phase and gas yield. It was found that molar fraction of H2, CH4 and CO increased with the increasing pressure, while molar fraction of CO2 decreased. It indicates that higher pressure facilitate purity of H2. But H2 yield reduces from 0.00736mol to 0.00332mol while pressure increases from 0 MPa to 20MPa. It demonstrates that higher pressure can reduce gas yield. As a result, the purity and gas yield of H2 should be considered simultaneously for selecting proper pressure. Additionally, it is difficult to separate H2 from CH4 and CO using the high-pressure absorption method. This work is very useful for process design, development and optimization of biomass gasification in supercritical water.

Abstract: Throat armor is very important for blast furnace in metallurgical industry, and its quality determines whether the procedure of blast furnace smelting can be carried out steadily for a long time. In this paper, the methods of mathematical simulation and actual production of blast furnace are applied, and the damage mechanism for throat armor is analyzed and studied. The results show that, the high temperature erosion and heat stress are the main reasons for throat armor damage, which make it upwarp falling, deform and fall off. According to the research of practical usage of throat armor, it proves that the result of mathematical simulation is reasonable. So the design parameters should be adjusted and optimized in processes of throat armor casting, and it is also reasonable and necessary to use the water-cooling throat armor.

Abstract: In this paper, the pressure of s195 diesel engine was forecast and analyzedthrough the equation of combustion established accordingly. And the result was evaluated by the test, which based on the different proportions of the diesel and bio-diesel fuel, then, the very inosculated result was received at last. And more, by measuring the content of soot and NOX, it was found that the waste let became better along with the increase of biodiesel, but was lower in dynamical nature. Through the synthesis value the content of biodiesel about 10% was the best.

Abstract: The paper presented a set of PRS-XY hybrid PMT, made up of a set of 3-PRS parallel mechanism and an X-Y table. For advancing the motion accuracy of the PRS-XY type hybrid CNC machine tool, the forward kinematics model and inverse kinematics model have been made, and main error sources affect to machine tool’s precision was established. The relative position of workpiece and the tool of PRS-XY PMT wad discussed, and the coordinate of tool surface was calculated in various process models. The chamfer shape with variation of main error sources was drawn in simulation software, and the processing experiment results prove the correctness of analysis and simulation.

Abstract: Two sets of power ultrasonic transducer applied to ultrasonic machining are designed in this paper, whose surface location, the number of piezoelectric ceramics is identical. By changing the parameters of the quarter wavelength horn which connects with the power ultrasonic transducer, the transducer changes of performance parameters are compared. The influence of the performance of different structural power ultrasonic transducer on its front cover is studied.

Abstract: It is required that an ADC for sampling broadband signal directly has high sampling rate, and this will make the sampling accuracy decrease and difficult to be realized. This paper introduces an idea that using multi-channel and low rate ADCs performs sampling broadband signal, then presents a novel method of utilizing adaptive beam forming technique to recover complete bandwidth of the broadband signal. Application of this method can implement both low rate sampling and high accuracy; in addition, it is robust to channel delay and other errors. The result of processing the simulated data has verified the effectiveness of this method.

Abstract: Through analyzing U type bending parts that has bottom-holes, a suitable Compound die that can complete 4 procedures - lancing, bending , punching and be cut off at in the same forming-position was synchronously designed. The die working process and the main points of the design are introduced here. Production testing confirmed that there were different levels of improvements in the product quality, production efficiency and economic efficiency. In order to meet the design and development requirement of the die, the proportion of the compound and progressive dies in the dies production has been increased in consideration of the structure and production costs of the die.