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High Speed Cutting (HSC) is an advanced manufacturing process technology which develops rapidly in recent years. It is also an important orientation in machining technology. It has made significant economic benefits in aviation, aerospace, automotive, mold, high-speed locomotives and other industry applications. Therefore, far-reaching significance will be achieved in improving the level of processing...
Two side direction burrs is an important factor of influence to edge quality and performance of precision parts. A finite element model was developed for simulation of two side direction burr formation process. Based on strain distribution, a two side burr formation mechanism was proposed. Strain of Cutting lay material near the side face in two side direction of work piece is determinant factor of...
Based on the elastic and plastic theory, Three-dimension milling Finite Element Method model is established in this thesis, which can be used in the machining deformation field analysis. This model simulates the process of material cutting off, which uses the technology of element die and birth. The machining deformation law is researched resulted by the release of residual stress in milling process...
Temperature is considered to be one of the most important aspects to take into account in dry hard machining. However, dry hard machining is a complex process, and the temperature is the most difficult to be measured when machining. Up to now, only very few studies have been reported on influence of tool wear and depth of cut on temperature fields produced during dry hard machining AISI D2 steel in...
Machining distortion of monolithic component is one of the most striking problems that aircraft manufacturing has to face up to. A physics-based material removing process simulation in computer is approached to analyze and control machining distortion. The actual material removing process is simplified and modeled with equivalent chip of uniform thickness. With a single tool-tooth milling process...
Titanium alloys are widely used in aerospace industry due to their excellent mechanical properties. Because of their low thermal conductivity, high chemical activity, large friction coefficient and so on, such problems occur during the cutting process as high cutting temperature, large specific cutting force and serious tool wear, leading to low machining efficiency. The titanium alloys classified...
Tool geometrical parameters had great influence on the cutting. The orthogonal finite element model was established. The model was used to simulate the influence of the geometrical parameters (rake angle, clearance angle, radius of tool tip) on the high speed cutting of aluminum alloy 7050T7451, and to investigate the influence of these parameters on the chip formation. In the same cutting condition,...
The dynamic model of a multi-axis synchronous gantry machining center VX32-60 is developed based on the finite element method. Both the numerical simulation and the modal experiment are studied. The nature frequencies and mode shapes are obtained by theoretical analysis and experimental results. The effects of material parameters and section parameters on the dynamic characteristics of multi-axis...
The compliant double parallel four-bar mechanism is a classical parallel guiding mechanism. A multiple-step beams model was established to analyze the static stiffness characteristics of the double parallel four-bar mechanism with right angle flexible hinges based on the symmetry of its structure. Formula for calculating the static stiffness was derived by applying singularity function. On the basis...
Based on Lagrange formulation, JC material model and criteriain of Cockroft-Latham, FEM model of ultraprecision cutting is presented. In this study, considerations in the tool edge radius, FEM model of cutting is presented to simulate the chip deformation, cutting force and stress-effective distribution in order to consider the interactive influences of tool edge radius, rake angle and clearance angle...
This paper presents a piezo-driven compliant stage implemented by the prismatic-prismatic (PP) compliant joint chains which accomplish a 4-PP compliant guide mechanism for two-DOF translations. The compliant joints consist of circular notch hinges. The 4-PP compliant guide mechanism is driven directly by two stack-type piezoelectric elements. Through design and analysis, the compliant guide mechanism...
Based on LS-DYNA software, metal cutting processes are dynamically simulated by using 2D r-adaptive method. The mechanisms of plastic deformation and chip formation in metal cutting are analyzed. The influences of tool rake angle and friction factor on cutting deformation are analyzed and deformation extent is measured by plastic deformation energy. According to the distribution of stress and strain...
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