Advanced Materials Research Vols. 472-475

Abstract: Paper deals with research of optimal technological parameters at burnishing after hard turning. Burnishing is a less known method, when we machine the surface of workpiece with a harder tool, without chip. Experiments focus on the microgeometrical properties of workpiece, at variation of feed and burnishing force. We measured also machining force at hard turning. Workpiece was from material steel bearing, with signal 100Cr6k and hardeness HRC64.

Abstract: Basically, the Magnetic Assisted (MA) processes of the surface finishing can be divided into two groups: processes based on abrasion and plastic deformation. In this paper the authors present the results of experimental and developing work regarding the Magnetic Assisted Roller Burnishing (MARB) process that operates by plastic deformation and the strain hardening effect. Using Finite Element Method (FEM) modelling software system was prepared to demonstrate the experimental results.

Abstract: This new dry magnetic separator has a special structure. It has many magnetic roll which are staggered like a stairsteps. It can finish the task of separating different minerals with only this one machine. And also it can make the different magnetic material which are in the same mineral separate at the same time. The permanent magnet system is made of large fan-shaped magnet. The magnet pole N and S are staggered and has perfect performance of magnetic separation. And the magnetic force is made full use by going-up dynamic separation. And also it gives an analysis of stress in the magnetic field. It also shows that its separation idex is better, the economic benefits are obvious, and it has broader prospects of popularization and application.

Abstract: To overcome the disadvantages of the commonly used dredging methods for the municipal drainage pipes with medium/small diameter, a novel robot was designed to take over the human to clean the pipes automatically. In order to adapt to the narrow environment, the wheeled walking mechanism was adopted by the robot, which was prone to skid during the operation. For this reason, a new kind of slip correction device was presented in the paper. When the slippage was detected by the photoelectric encoders installed on the driving and driven axles of the mobile carrier, the device would put into operation automatically. The dual-parallelogram structure was introduced so as to obtain the better compressing effect and reduce the space occupancy. It is demonstrated that the reasonable design of the slip correction device can ensure the robot to work reliably during the whole process, therefore improve the operation efficiency greatly.

Abstract: It is an important method to machine revolution aspheric with Arc Envelope Grinding Method（AEGM）. CNC system controls the feed rate of the arc center of the end of the wheel in grinding, Disk-shaped grinding wheel processing curve (ie, cross-section curve of rotary aspheric) and motion curve of the arc center of the wheel are equidistant curves each other . Based on the analysis of the angular velocity (ω) of the grinding point, the relationship between the feed rate of the arc of the wheel (υ0) and the feed rate of the grinding point (υ) is analyzed, the feed rate and the angular velocity of the grind point is discussed when the eccentricity of the meridional cross-section curve take different values. The results show: 1) the feed rate of the grinding pointυ=υ0±ωr; 2)ω is changing in grinding, When the caliber of axisymmetric aspheric (ie, z value) is small, ω will change slowly, otherwise, ω will change rapidly when the caliber of axisymmetric aspheric is large; 3) the ratio of υ/υ0 will change with the z-axis coordinate changes. υ/υ0is larger when the caliber of axisymmetric aspheric is smaller. By analyzing ,υ/υ0 and other parameters, the motion law of the wheel is obtained, which will provide confirm base for optimizing feed rate in grinding and improve the precision of grinding.

Abstract: Introducing the grinding mechanism of axial creep-feed grinding ceramics with a single diamond grain. Establishing the simulation model of a single grain grinding engineering ceramics by axial creep-feed grinding and analyzing the simulation results of the grinding force in the X,Y,Z axis. Finally, the impacts of the wheel speed, axial feed rate and workpiece speed upon grinding forces were discussed by simulating the single diamond abrasive grinding process under different grinding conditions.

Abstract: A detailed simulation research on the flow field spray nozzle of 6WC-30 Y-G vehicle-mounted machine in the paper was performed, and it has been carried out the different size vortex flow length is corresponding to the atomization distribution, contrasting the effect of different on the Three kinds of different blade length size of vortex solution atomization was found , from the experimental results, it can be concluded that the spraying nozzles of vehicle-mounted machine closely related to the vortex length. It has become apparent that the result of simulation has been provided a theoretical basis for its optimization guiding to improvement.

Abstract: A novel real-time distribute dynamic liquid measurement system is proposed with the method based on ideal gas state equation and wireless transmission technology. For the designed system, the constitution and working process, the sensitivity and stability, the error analysis of multi-objective synchronous acquisition, as well as improvement possibility are all discussed in detail. Critical parameters representing dynamic liquid volumes in distribute closed multi-objectives could be collected over some distance and resolved in the center of the system in real-time. The results show that the total accuracy of the designed system could be better than 2% within usable measurement range, if some key detectors were carefully selected.

Abstract: This paper analyzes the mechanism of EDM and the machining characteristics of difficult-to-cut materials. Analyzes the EDM parameter selection and the influences from electric parameters to electrode wear and processing speed in EDM. Through the test of electric machining difficult-to-cut materials, the degree of influence that electric parameters to electrode wear, processing speed and processing quality are analyzed. Titanium and stainless steel materials are processed by high-current power. After the processing, analysis and study are carried out on the metallographic structure and mechanical properties of these materials. The test result is satisfactory.

Abstract: In this paper, an approach is developed on Taguchi method to optimize the drilling parameters in drilling carbon fiber-reinforced plastic (CFRP) by the candlestick drill bits. The experimental results indicate that the feed rate (f) and the drill diameter (d) are the most important factors and the spindle speed (S) is insignificant in drilling CFRP laminates. The optimal drilling performance for the thrust force was obtained at 0.01 mm/rev feed rate, 800 rpm speed spindle and 6 mm drill diameter settings. The best combination to attain smaller delamination factor was 0.01 mm/rev feed rate, 800 rpm speed spindle and 10 mm drill diameter.