Papers by Author: Yi Qiang Wang

Abstract: Based on the failure data of the CNC system in two years, the failure positions, failure modes, failure causes, failure sources of the CNC system hardware and software were analyzed. The more failure positions were analyzed further by FMECA method, proposing content, key point and method which should be paid attention to while using and maintaining the CNC system. The weak parts and its correlative components were also pointed out, so as to provide the basis for improving the reliability of the CNC system hardware and software.

Abstract: In order to rescue the problems of controlling laser bionic strengthening local stripe of mould surface quality, it is put forward thoughts about the laser bionic local melting stripe of mould surface quality detection based on acoustic signal. Analyzed with the relationship between defocusing distance and acoustic signal characteristic, laser bionic strengthening local stripe quality, the results show that acoustic signal is weakened with the increased absolute value of defocusing distance. As the defocusing distance is 0mm, the role of the laser is primarily ablation and the stripe quality is the worst; the function of laser on the surface materials is too weak to strengthen when the defocusing distance is -4mm; laser on target surface plays its role of strengthening, mainly owing to melting, with defocusing distance of +4mm. Overall tests show that, based on the quantitative detection of acoustic signal characteristic, it could inspect and control the quality of strengthening stripe, and it will realize the overall control of laser bionic strengthening mould surface quality with guiding significance.

Abstract: This paper discusses the design of a new type fast tool servo (FTS) for precision diamond turning. The FTS has two degrees. One of them is transversal along the Z axis of lathe and the other is rotation around the Y axis. Both of the two movements are driven by electromagnetic force. The moving assembly is designed to be parallel structure for guarantying both of the two movements has similar response frequency and maximum stroke. The output force of normal electromagnetic force generated by magnetic flux bias motor has been calculated. The design of transmission mechanism has been presented. The result of acceleration calculation shows that the FTS achieves acceleration up to about 650G in both directions of movement.

Abstract: A compliant abrasive tool is investigated in this paper. By the polishing experiment of this abrasive tool, the technique of polishing the large mould free-form surface is acquired. The polishing experiments about the elastic abrasive tool are carried out, which indicates that the abrasive tool has the advantages of the high efficiency, the elasticity and compliant performance. The relation of the deflection and polishing force is investigated and it is concluded that they is approximately linearity. The effect of polishing pressure on the surface roughness is researched by experiment. Polishing quality for the edge of abrasive tool was investigated and presented. These experiment results provide significant foundation for planning polishing path and controlling process parameters to achieve good surface roughness and high efficiency in the next research.

Abstract: More and more high-level order-picking trucks are used to pick and transport goods in warehouses. The dynamic stability of the truck has great effect on operation efficiency, quality and safety. It is instructive and meaningful for the optimization of structure and control strategy to analyze the dynamic stability of the truck. Firstly, the dynamic model of the order-picking truck is established using Alembert principle, and then the dynamic stability of the truck is analyzed. Secondly, the virtual prototype model of the truck is established and traveling process is simulated. The simulation further verifies the dynamic stability of the truck.

Abstract: In order to improve the operation efficiency of order picking trucks in the warehouse, the mathematical model of the routing optimization problem is established. Then PSO (Particle Swarm Optimization) and ACO (Ant Colony Optimization) are used to solve the model. Experimental results show that both of them have good overall search ability and astringency. The operation efficiency is improved to a great extent by using swarm intelligent algorithms.

Abstract: A new piezoelectric rotary mechanism for precise positioning was proposed. It was designed in asymmetrically configuration of two sets of cantilever bimorphs with end-mass. And the frictional force between the revolving shaft and axle housing can be adjusted within potential range. The rotary actuator can run silently and smoothly on sine wave electric voltage. The dynamic characteristics have been tested on assembled prototype. The rotary actuator is desired to used in micromachining or micro-assembly etc.

Abstract: A new piezoelectric in-plane traveling mechanism of miniature robot was proposed. It seems like a small tripod-type device and runs on stick-slip principle. There were three actuators acted as feet in the traveling mechanism. They were driven separately and controlled through a microcontroller unit to realize varied motion. Theoretically, the mechanism could revolve around any axis and translate along any direction under the appropriate control manner. Therefore, it was desired to serve as locomotive units for miniature robot, which perform various precise positioning tasks such as micromachining, micro-assembly etc.

Abstract: Based on Oxley’s predictive model, the novel analytical modeling of shear band spacing of serrated chip in high speed cutting of aluminum alloys is investigated accounting for the effect of strain rate hardening in addition to temperature softening. It is indicated that the shear band spacing decreases with increasing the cutting velocity and increases with increasing undeformed chip thickness. Other than the cutting velocity and undeformed chip thickness, the shear band spacing initially descends to minimum and subsequently ascends with increasing the tool rake angle.

Abstract: In this paper, a hybrid method of correlation analysis based on the gray theory and the least squares support vector machine is proposed to model the thermal error of spindle of NC machine tool and predict the thermal error. The gray correlation analysis is used to optimize the measuring points of spindle. The optimum measuring points and the measured thermal error of spindle are regarded as the data to be trained to build the thermal error prediction model based on the least squares support vector machine (LS-SVM). The results show that the thermal error prediction model based on LS-SVM of NC machine tool has advantages of high precision and good generalization performance. The prediction model can be used in real-time compensation of NC machine tool and can prove the process precision and reduce cost.