Papers by Author: Yu Wang

Abstract: With pelton turbines and other complex three-dimensional structure cavities that contains various shaped surfaces and all kinds of larger curvature, the three-axis CNC machine with a tool rotary to achieve the four coordinate overall Pelton CNC machining. According to processing characteristics of pelton runner, the paper determines the selection of materials and the overall structure of the tool. And the appropriate way of milling and milling parameters are made. The overall processing program and processing parameters of pelton runner are designed on this basis. The feasibility of the process and cutting route are verified by the simulation of cutting route and experiments.

Abstract: High-temperature alloy is an important material in making critical aerospace engine parts, it is also used in weapons industry, energy, chemical, power, etc. In this article, DEFORM-3D software applications to establish a three-dimensional cutting model of high-temperature alloy GH4169. Combined with cutting experiment analysis the characteristics of the tool wear and cutting temperature by change cutting speeds, and optimized cutting parameters combined with experimental on tool wear.

Abstract: The three-dimensional finite element modeling and experimental validation of plunge milling of stainless steel (1Cr13) are presented. The commercial software Deform 3D applied for the finite element modeling is studied the effect of feed rate per tooth (f_z) on the cutting forces and the temperature fields. The formation of chip in the finite element model is formed by local adaptive remeshing technique. The feed rate per tooth (f_z) significantly affects the cutting forces, but slightly influences the maximum temperature of the chip.

Abstract: In the deep hole boring, the vibration of the boring bar is greater. In order to improve the machining processing efficiency and quality of the deep hole boring, this paper designs the deep hole damping boring bar with a single oscillator firstly. It builds a simplified dynamic model of the damping boring bar and calculates its relevant parameters. Moreover, with different external excitation force frequency, the maximum amplitude variation of the boring bar tip position is obtained from the simulation analysis. Finally, the experiments show that: Compared with the hollow boring bar and the solid boring bar, the damping effect of large aspect ratio vibration boring bar increases about 75%.

Abstract: High-temperature alloy can easily produce jagged chips in high-speed cutting conditions. The serrated chips will lead to the volatility of cutting force and impact the processing efficiency and quality. The formation mechanism of serrated chip has important significance to improve processing quality and efficiency. As the serrated chips have very short generation time, it is very hard to measure the changes of the stress, strain and temperature during the formation of serrated chips in experimental method. And it is more difficult to carry out quantitative and qualitative analysis. So it has been the research priorities and difficulties in the field of metal cutting. In this paper, both the finite element method simulation and experimental method are used to study the formation mechanism of serrated chip, deformation of material and the degree of variation of jagged. It has an important reference value to select cutting parameters for high-temperature alloy cutting.

Abstract: Fir tree groove broaching rebound has an obvious impact on the wheel groove manufacturing accuracy. The prediction of wheel groove rebound in the broaching process is an important aspect to improve the manufacturing precision of wheel groove. The deformation caused by cutting force is the main factor that decides wheel groove broaching deformation. For the problem of tree wheel groove broaching deformation and rebound: Firstly, calculating the actual cutting force through experiment and empirical formula of cutting unit cutting force, and then loading the cutting force as the initial load in the wheel groove line; Secondly, using the finite element software-Abaqus to copy the analysis of the wheel groove in the broaching process; Finally, comparing the rebound deformation curve and the data generated by the simulation with the actual ones measured by the worked wheel groove, and the result of simulation is consistent with the rebound. The prediction of wheel groove broaching rebound provides the basic theory to improve the wheel groove broaching of rebound problem.

Abstract: Passive dynamic damping system in damping boring bar is made of rubber, damping blocks and damping liquid. These parameters ,which including the elasticity of the spring rubber, the mass of the damping blocks and the characteristic of the damping liquid, will have influence on damping property. This paper mainly studies the influence of spring rubber parameter on damping property. Frequency response curve of spring rubber can be got by simulation, spring rubber static analysis by ANSYS and damping boring bar vibration simulation by ADAMS. After verification by simulation, the model and resolving method of parameters can provide theoretical basis of actual application and design.

Abstract: Titanium alloy is widely applied in various fields, but it’s a sort of difficult-to-cut material. In this paper, DEFORM-3D is used to carry on a simulation of PCD tool milling Ti6A14V. Variation curves of cutting temperature and cutting force are obtained by changing cutting speed, feed per tooth and axial cutting depth. Further, the effect of cutting parameters on cutting temperature and cutting force is revealed. The research shows that cutting temperature and cutting force increase with cutting parameters. In addition, single factor experiments are conducted to verify that the results of the experiments are in consistent with those of the simulation, and that the simulation model is correct. The results will provide new methods for studies of cutting temperature and cutting force of PCD tool milling Ti6A14V.

Abstract: The finite element modeling and experimental validation of three-dimensional heavy cutting of high strength steel (2.25Cr-1Mo-0.25V) are presented. The commercial software Deform 3D applied for the finite element modeling is studied the effect of feed rate on the principal cutting forces and the temperature fields. The friction between the tool and the chip is assumed to follow a shear model and the local adaptive remeshing technique is used for the formation of chip. The feed rate significantly affects the cutting forces, but slightly influences the maximum temperature of the chip. The simulation results are compared with experimental data and found to be in good agreement.

Abstract: In this paper, the effect of cutting parameters on cutting force, cutting temperature and surface roughness on cutting force, cutting temperature and surface roughness are experimentally studied in spray cutting GH4169 Ni-base superalloy used carbide cutting tools. The results showed that reasonable choice of cutting parameters can effective reduction of cutting force and cutting temperature, and improve the machining surface roughness. Thus realizing clean production mode.