Advanced Materials Research Vol. 670

Abstract: GBT Series Small flow Pump body long position complex shape, size, high precision manufacturing process complexity, the process is prone to waste, the use of computer-aided process control, by means of the signal characteristics of the collection, analysis and processing of information, the timely issue of warning signal or direct feedback to the error correction processing equipment to ensure product quality and processing operation of the system reliability.

Abstract: In order to mend cutting instability of ball-end milling cutter caused by the changes of cutting loads in high speed milling hardened steel, we perform the modal analysis and heat-force coupling field analysis of cutter, carry out the experiment of high speed milling hardened steel, investigate the character and effect factor of physical field distribution in high speed ball-end milling hardened steel, and propose the method about the match of diameter and overhang for depressing cutter vibration. Results indicate that the decrease in the ratio of overhang to diameter can transform the first modal shape of cutter from bending modal shape into torsion modal shape. The diameter of cutter is from 30mm to 20mm, the overhang of cutter is from 125mm to 90mm, heat-force coupling field distribution changes slightly, resonance of cutter does not occur, and efficiency in machining hardened steel can be improved effectively by higher cutting speed.

Abstract: Machining with five-axis equipment can offer manufactures many advantages, including dramatically reduced setup times, lower costs per part, more accurate machining and improved part quality. While in five-axis machining, the tool axis changes frequently, even the most experienced engineers are difficult to judge the correctness of its tool path. So in this paper, taking five-axis machine tools as the prototype, the process of building NC simulation platform was introduced by using simulation software VERICUT. After that, it introduced simulation operations, verifying the simulation platform and data simulation function. Finally, the correctness of the simulation was verified by machining experiments. Researching CNC machining process on the VERICUT platform, the research results were used in five-axis machining simulation of integrated impeller and it improved both the process capacity and efficiency of the integrated impeller greatly. This method obtained in this paper could eliminate the colliding and interference phenomenon during test cut, reduce costs, improve the efficiency of programming and shorten the manufacturing period.

Abstract: To optimize the process parameters of cold rolling the finite element model of metal plastic flow in cold rolling was carried out based on the cold forming principle of ballscrew and rigid-plastic finite element theory. The adaptive mesh refinement was utilized to improve calculation accuracy in large plastic deformation zone. Using lagrangian algorithm the processing of cold rolling is numerically simulated by DEFORM-3D. The appropriate revolution speed is got by analyzing different simulation results such as the maximum stress and maximum strain and flow velocity etc. under different revolution speeds. The appropriate transmission ratio is got by analyzing different simulation results such as the maximum stress and maximum strain and flow velocity etc. under different transmission ratios. The research results provide evidence for process parameters optimization. At the same time those research results lay a foundation of further study of forming mechanism.

Abstract: In this paper through simulation a single factor analysis and research four parameters of Self-propelled high Spray Machine steel stamping forming ,including die gap(), die radius(r), friction coefficient(f) and drawbead height(h), on the impact of sheet forming. Considering the defects of steel forming in the actual production, the most important parameters is determined and four parameters and three level orthogonal experiments are carried out. The drawbead height (h) is the most important parameter affecting in steel forming that should be strictly controlled in the actual production. The die gap () is secondary. The die radius (r) and the friction coefficient (f) affect the least. In order to improve the quality of stamping, the3r2f3h3 process combination should be adopted, which provided some theoretical guidance in actual production

Abstract: Machining instability is often the limiting factor on metal removal rate. So the stability of cutting system is an important research in high-speed machining area. It is widely used in engineering practice. In this paper, the stability of high-speed milling was studied by the numbers aiming at the dynamic milling process model of ball-end mill. The dynamic model of high-speed milling process was established. On the basis of Altintas’s theory, the formula about the limit axial depth of cut was derived. Besides, the model parameters of the system were obtained and the accuracy of the stability lobes diagram was verified through the experiments. From this research, it was learned that structure parameters of machine tool-cutting tool system, cutting force coefficients, spindle speed and axial depth of cut were factors affecting the stability in high-speed cutting. And the obtained stability lobes diagram provided a reliable basis in selecting cutting parameters during tool path planning.

Abstract: According to the practical situation in hydrological telemetry stations, a perfect solution scheme based on GPRS/GSM wireless network is made. The reliability and timeliness of data transmission is assured in maximum extent by GPRS and auxiliary SMS. By using the automatic hydrological telemetry system, the traditional manual way is thoroughly discard and the work intensity of prediction is greatly decreased. Integration of telemetry, forecasting and monitoring is really realized.

Abstract: Based on the milling experiments for the difficult-to-machine material 3Cr-1Mo-1/4V steel, as the goal of minimal adhering disrepair, taking the waved-edge milling insert (the rake face is curve plane) developed by Harbin University of Science and Technology as an example, we have study on the optimization object function of the milling insert grooves. Based on the heat density function of the 3D complex groove milling insert, setting the heat density function as boundary conditions, we have the finite element analysis (FEA) on the temperature fields of different cutting parameters, and have fuzzy synthetical judgement on the temperature fields with fuzzy mathematic theory. We build the object function relation between the fuzzy synthetical judgement results and cutting parameters of the adhering disrepair, so to have groove design optimization. So provide the theoretic and technical basis for solving the adhering disrepair problem and groove optimization.

Abstract: Cutting temperature is the main factor to be considered in the select of coated cutting tools, so the study on the temperature of coated cutting tools is of practical significance. Diffusion layer of coated cutting tools has important implications on cutting heat generation and temperature distribution. In this paper, thickness of diffusion layer is determined by making use of spectrum analysis method to observe elements diffusion between coating and substrate of coated cutting tools. By dividing the diffusion layer into two parts on both sides of interface of coating and substrate, diffusion layer model is established. By integrated use of calculation method of Maxwll-Eucken model, Series model and equivalent thermal conductivity of multi-layer materials, thermal conductivity calculation formula of diffusion layer is derived. Method of thermal conductivity calculation when combining coating and diffusion layer into a whole layer is also put forward. Results of this paper have wide significance for experiment and simulation study on coated cutting tool temperature.

Abstract: Ca3(VO4)2:Eu3+,Bi3+ nanophosphate was prepared in the presence of stearic acid. The samples obtained were intensively characterized using XRD, SEM, photoluminescence (PL) spectra and FTIR. The results show that the red emission located at about 614 nm was ascribed to 5D0–7F2 transition of Eu3+, and the excitation and emission spectra indicate that this nanophosphor can be effectively excited by ultraviolet (UV) (395 nm), and exhibits a satisfactory red performance (614 nm), nicely fitting in with the widely applied UV LED chips.