Materials Science Forum Vols. 800-801

Abstract: In cavity die corner-machining, tool flexible deformation caused by the milling force resulting in the surface error, a method of off-line error compensation is put forward. Instantaneous chip thickness model and the corner milling force model is established based on differential and the characteristics of the corner. Combining the theory of cantilever beam and the finite element analysis, cutting tool elastic deformation model is established.

Abstract: For improving heavy milling machining environment, take the vibration modal and noise radiation distribution of milling cutter-workpiece as the research object, according to the characteristics of milling, consider vibration and noise generation in the milling process comprehensively, first establish the geometry model of cutter-workpiece, and then conduct finite element modal simulation and calculate the vibration response, so as to predict the distribution of noise field, and analyze the noise radiation, finally verify the vibration noise distribution of cutter-workpiece through milling noise distribution experiments, which lays the foundation for further research on vibration and noise reduction in heavy milling process.

Abstract: Design and calculation of dual-use spiral mobile devices for horizontal and vertical, according to the principle of screw drive meet the needs of the weak magnetic detection technology. The device consists of the support part, guide part and transmission part, simple structure, may be supporting the use with weak magnetic equipment for the handheld single point measurement, and drive probe mobile to complete the measurement and maintained liftoff value unchanged in mobile. Carry on a large number of weak magnetic detection experiments using the device, the results proved that this probe mobile device easy to use, reliable mobile precision to meet the testing requirements.

Abstract: During the drilling process of CFRP laminate with brazed diamond core drill, drilling temperature is very important to the drilling CFRP with brazed diamond core drill, which will influence the tolerance, defects of CFRP. In drilling experiments of CFRP laminate, the temperatures under different cutting parameters were measured by an infrared camera, and the effects of drilling parameters on drilling temperature were analyzed and the influence of grits distribution on temperatures were also studied. The results shown the drilling temperatures rise while increasing density of grits, grinding speed, and decreasing feeding speed.

Abstract: Machining operations are performed by machine tools with a large amount of energy consumed for material removal. Understanding and characterizing the energy consumption is essential to explore the potential of energy-saving in energy-efficient machining. For this purpose, this paper proposes a method for modeling energy consumption of end milling operation which is based on cutting theory. The cutting power model is verified with experiments on a CNC milling machine. According to the calculated and experimental results, it is clear that the theoretical prediction can predict the mean cutting power successfully as validated by actual measurements.

Abstract: Monitoring cutting force in manufacturing operations is important for controlling cutting process and surface quality. In this paper, a thin film sensor embedded in metal was designed and embedded on the holder of tool to measure the force in machining operations. The Wheatstone bridge would produce the output voltage when the thin film caused deformation by cutting forces. The relationship between the output voltage and the deformation of beam was analyzed and derived with formula. The results showed that cutting force could be calculated according to the output voltage.

Abstract: Nickel-base superalloy GH4169 is a kind of alloy with high intensity, heat-stability and heat-fatigability, so that is often used to aerospace field, but which has poor machinability. The cutting force, plasticity deformation all present their particular characters which causes cutting vibration . The cutting vibration influence the surface roughness, the swing of the cutting force and tool wear. This article discusses the superalloy of GH4169 on the basis of cutting speed, cutting depth and feed per-tooth.

Abstract: This paper reviews the development history of parallel machine tool and new achievements in China and abroad. Typical methods of error modeling, error detection and error compensation are introduced. After analyzing the biggest problem of recent error compensation technology, this paper prospects the further research trends.

Abstract: Matlab and Microsoft Visual C++ were used to program the automatic measuring instrument for the flatness error of the Rail wagon. Microsoft Visual C++ is used to program the struct body, which takes full advantage of the high programming efficiency, high execution speed and beautiful imple interface. In the meantime, powerful computational function and image fitting of Matlab is added to the program. Through the method of Dynamic Link Library, these two softwares are linked and the figure created by Matlab can be insetted in the main interface created by Microsoft Visual C++, which keeps the united and elegant appearance.

Abstract: The automatic measuring instrument for the flatness error of the rail wagon is designed with carbon fiber and aluminium alloy, which makes the instrument handy with good stiffness. After the design for the main structure and arranging the position of sensing element, finite element analysis is used to guarantee that deformation of structure itself will not affect the measurement accuracy. The design of the automatic measuring instrument for the flatness error of the Rail wagon takes the place of tradional feeler gauge measurement, raised the work efficiency and improves the measurement accuracy to 0.1mm.