Papers by Author: Can Zhao

Abstract: This paper will use the Al₂O₃-SiC_w whisker toughening ceramic tool WG300 and Si₃N₄-Al₂O₃ (Sialon) SX9 ceramic tool cutting performance test.Study on different cutting speed, ceramic cutting tool in machining nickel based high-temperature alloy tool life and tool wear mechanism, and analysis of the wear form under different cutting parameters. The test results show that: with the increase of the cutting speed, WG300 and SX9 two kinds of tool durability showed a downward trend, the value of VB is higher than that of Al₂O₃-SiC_w whisker reinforced ceramic cutting tool flank wear of Sialon ceramic cutting tool, but its notch wear value VN is far less than Al₂O₃-SiC_w whisker reinforced ceramic cutting tool,the main failure form of WG300 notch wear, the main failure form of SX9 for the flank wear.

Abstract: Nickel-based high-temperature alloy GH3039 is a kind of alloy with the poor thermal conductivity, work hardening and hard particle. It has poor machinability. The orthogonal experiment is adopted for the study on the effect of the cutting parameters on the high-temperature alloy GH3039 milling force by using the carbide tool. The milling force of the size is obtained by orthogonal cutting experiments under different cutting parameters, and analyzed the size of the cutting parameters on cutting force of law. The milling force experience formula is established by means of regression analysis. The rationality of the model is examined by using the absolute error calculation.

Abstract: This paper makes an experiment in high-speed milling of Inconel 718. Cutting tests were performed using round and ceramic tools, at feeds from 0.06 to 0.14 mm/tooth, Axial Depth of Cut from0.5 to 1.5mm,and cutting speeds ranging from 500 to 1037 m/min. The behaviour of the cutting forces during machining was then measure. The results show that cutting force increases first and then decreases with the increase of feed per tooth, the tool chipping and groove wear were found with the increase of axial cutting depth, and cutting force is increased; the increase in cutting force with the cutting speed increases, when the cutting speed reaches a critical speed, the cutting force as the cutting speed increases began to decline.

Abstract: Circular features are one of the most widely used shapes for camera calibration, due to several advantages: easy to make and recognize, not sensitive to image noise, symmetry, analytic formulation is simple. However, perspective projection is generally not a shape preserving transformation. A circle often mapped as an ellipse on the image plane when the feature and the image plane are not parallel to each other, as a result, the center of the circle shift from the center of the ellipse. In this paper we present a simple and robust algorithm to compensate this bias before camera calibration. Experimental results show the algorithm is important and convenient.

Abstract: This paper comes up with an approach for surface reconstruction from arbitrary, unorganized and intersecting curves. First of all, camera calibration determines the interior and exterior camera parameters. Based on laser triangulation measurement, the point in world coordinate system can be computed. The extracted curves are processed in a volumetric in which a vector field is built and updated to compute the neighbor-hood points. Then the surface reconstruction can be obtained with MC algorithm. This approach makes surface reconstruction and curves registration a unified procedure. This algorithm solves the problem of linear complexity respect to input curves, and makes it suitable for interactive modeling. The experiment verifies its available, reduces the effect of registration errors and has a good result.

Abstract: To improve the production efficiency and product quality of titanium alloy TC4, with the minimum of cutting force F, surface roughness Ra, and surface peak valley height Pv as the optimized goal, using orthogonal rotating combination design method of three factors quadratic regression, the influence of cutting speed vc, feed per tooth fz and cutting width ae to cutting force (Fx, Fy) surface peak valley height Pv and surface roughness Ra are mainly studied, and the best cutting amount combination is chosen. Experiment results indicate that the best cutting parameters of titanium alloy are vc=28.588 m/min、fz=0.043 3 mm/z、ae=0.1 mm, the optimal values are =3.346 N、 =47.01 N、 =673.89 nm and =201.78 nm. This research is of theoretical significance for improving the processing efficiency and machining quality and reducing the production cost.

Abstract: In this letter, a simple method was applied to fabricate different morphologies of CuS particles. The ratio between CuSO₄ and thiourea played an important role in preparing various CuS particles such as nest-like, cabbage-like and cauliflower-like structures. Further, the formation mechanism of CuS was proposed that the assembly process of CuS nanoflakes induced the various structures.

Abstract: High-speed machining aluminum alloy blades, often can generate chatter. The static modal experiment and dynamic cutting test method was used to get the influence factors. It studied the change of blade modal during the material removal process according the experiments since the thin blade and large influence to its stability of the removal of blank. Through the study it was found that there are two modes of blades within the scope of sensor’s detecting. Blade modal frequency appears to first increase then decrease during the material removal process with little vibration. The dynamic experiment analysis the factor of cutting force in five-axis milling process and messures five-axis machining cutting force in various parameters. It was observe that distribution of 3-dimension cutting forces in cutting path. It was found that the distribution rule of cutting force. Resultant cutting force was increased with cutting speed increased.

Abstract: The stability of cutting system is an important research in high-speed machining area. It is widely used in engineering practice. First, this paper studies the milling forces and their change law when milling aluminum alloy through orthogonal experiment. And it solves the milling coefficients. Second, it modal parameters of milling system such as natural frequency, modal mass and equivalent stiffness by hammer experiment. On this basis, it draws the stability lobe about the spindle speed and radial depth of cut and verifies the accuracy of the stability lobe.

Abstract: On the basis of the ball-end milling feature during high-speed machining impeller, the relationship between cutting force and chips is analyzed in this paper. The model of ball-end milling cutter cutting force is founded through differential method. And the coefficients solution of cutting force model is expounded. Besides, the coefficients solution and the cutting force model simulation are implemented by the software Matlab.