Advanced Materials Research Vol. 1027

Abstract: In order to achieve the local resonance of flexible-rod whetstone-seat vibration subsystem of the ultrasonic honing device, and using the analysis method of control theory, to regard the flexible-rod and whetstone-seat as the independent part in dynamics, their natural frequency and the vibration displacement function respectively are calculated by adopting the model of vibration with uniform section rod. Then the relationship between the natural frequency and the geometrical parameters of flexible-rod and whetstone-seat are established. The experiments shows that the computed result approximates the actual of flexible-rod whetstone-seat vibration system relatively. For the design of flexible-rod whetstone-seat vibration system with better vibration performance, it has the significant reference value.

Abstract: With the fast development in continuous conveyor technology, the belt conveyor to be more widely applied, the belt conveyor technology is gradually refined, and has made a number of achievements. Drum as a belt conveyor drive components, attracted the attention of the relevant technical staff. To ensure the belt conveyor system, the optimizing design of the drum quality and the strengthen use of the drum performance have an important guiding significance to the safety and reliability as a whole. With the help of ANSYS software, finite element analysis, the optimal design results analysis showed that the effect of optimal design to achieve the purpose of has a certain guiding significance for optimizing the structure of actual production. Key words: Belt conveyor; drum; transmission parts; ANSYS; the optimization design

Abstract: Taking the spindle system of CNC drilling and boring machine that exclusively used in the latest developed bearing cage as study subject, this paper investigates the optimization of the spindle system by improving the support bearing structure and optimizing the spindle span to get the optimal span. Through modeling analysis, the fundamental frequency of the optimized spindle increase 16.9%, which provides effective-proof performance optimization.

Abstract: Along with the computer software technology, the virtual instrument is gradually become the development direction of the test area. The realizing vibration test which is analyzed by adopting the virtual instrument has become the development trend of vibration test. It firstly introduces relevant simulation technology theory, the principle of fault diagnosis, the significance and the development present situation. Then according to the research for the development current situation of condition monitoring and fault diagnosis at home and abroad, it puts forward the vibration test analysis system composed the necessary sensors, signal disposal device and data acquisition card. At last it uses labwindows software produced in NI to do the development platform.

Abstract: According to the unique advantage of the ultrasonic vibration processing in brittle materials, a new processing method, combining ultrasonic vibration and high-speed milling, was presented in this paper, to investigate an adaptation of high-quality and efficient processing in carbon fiber composites. Based on vibration theory, the special ultrasonic vibration milling device suitable for high speed machining centers was designed. Taking into account of a range of issues existing in contact electrical transport under high-speed processing, the contactless induction power transmission system was developed, and the impacts of load, frequency, air gap size as well as the existence of compensation on the transmission performance was discussed. The study shows that carbon fiber composites processed under ultrasonic vibration with high speed, high quality and high efficiency are adapted. Keywords: ultrasonic vibration milling; carbon fiber composites; contactless induction; tool wear

Abstract: This paper presents a novel strategy for fabricating hydrogel scaffold at ambient temperature by 3D printing supplemented with an ultrasonic spraying which involves crosslink reaction. The contradictory between the rheological properties and solidification of natural biological material for machinability and formability respectively at ambient temperature was solved. The gelled fraction and porosity were measured respectively to study the influence of crosslinking agent. The results showed that the two subjects appear a parabolic trend with the concentration of CaCl₂ from 2% to 4%, but the tolerance of aperture decreases monotone.

Abstract: Given that the grain geometry has an important impact on grinding process, it’s necessary to investigate the influence of grain shapes on grinding mechanism. In this paper, a 3D FEM model is developed to study the effects of CBN grain geometry on its microcutting performance under various speed levels, which is effective to understand the microcutting process qualitatively and quantitatively. The simulation results indicate that the single grain microcutting force ratio and material removal ratio are both sensitive to the grain shape and those grains with truncated tetrahedron shape of large cross-sectional area and negative rake angle would improve the cutting performance.