Papers by Keyword: Cutting Model

Abstract: For the redundant codes caused by software reuse and rapid development in object-oriented program, the paper proposes a cutting model and designs a cutting scheme based on this model. Firstly, a cutting model is established. Then, static analysis is made for object-oriented codes and the cutting information base of objects to be clipped is established. Lastly, the cutting information base and cutting model is matched to cut the program. A test on a practical java project indicates that the cutting scheme can make the volume of the project reduce by about 21%.

Abstract: For different three-axis machining characteristics, SolidCAM provides many machining strategies including linear, correction, spiral, imitation cutting and so on. This paper chooses three-axis revolving curved surface parts as the research object and reference three-axis stereo processing combinating wrap-around roughing and linear processing. Finally, the cutting model of this machining strategy based on parameters has been established to provide a reference for the determination of cutting parameters.

Abstract: The present paper highlights the importance of size effect consideration during the modelling of material removal by cutting tool, especially when passing from maco-to-micro scales. For that, the presented study concerns an orthogonal case of down-cut milling where the chip thickness is evolving. Consequently, to capture the scale effect when passing from macro to micro dimensions, the theory of gradient plasticity were adopted.

Abstract: The characteristics of serrated chips were analyzed using the theory of shear-slipping deformation at high speed cutting, with geometric and mathematic models of the chip built. Deformation of continuous chip for scissile metal materials can be analyzed and controlled by analogous methods that are employed at normal cutting speed. Geometrical model about serrated chip for difficult-to-cut material under orthogonal cutting condition is offered by proper simplifying. The nonlinear equations of indices related to some factors for measuring deformation degree of chip have been ascertained. Based on the condition fo forces equilibrium with respect to single serrated chip at the moment when it is to be in shear instability, forces equilibrium equations are obtained, with shear force and shear velocity as well as friction force and flowing velocity for a chip segment found. Finally, energy equations of cutting are acquired from deformation energy and friction work consumed in the course of chip formation, which can be offered to the further study of mechanism of high speed machining and the design of high speed machine tool.

Abstract: The paper make the service life of relieving formed milling cutter as the optimization objective, proceed the simulation study on the mechanical degree of cutter, cutting data. The concrete method is that the orthogonal milling model is established to simulate the simulation milling process, some basic parameters which are obtained in the machining process are analyzed and discussed. The results indicate that the finite element simulation of the metal cutting processing can analyze quantitatively some physical properties, such as the cutting force, stress, strain and so on, the traditional way of qualitative analysis is changed. The state of machining is in favour of grasping in the theory, the theory and technology are provided to establish the proper processing technology strategy.

Abstract: It analyses deeply the diffrence between micro cutting and conventional machine cutting from the mechanism of cutting surface formation in this paper, and building the micro cutting model , then analyses friction mechanism of micro cutting processing introduce a new micro friction model, this paper discusses interface micro friction characteristics in the process of micro cutting.

Abstract: According to the size effect theory established on the concept of geometrically necessary dislocations and results of nano-indentation experiments, a novel brittle-ductile mechanism of ultra-precision turning of single crystal silicon is proposed. The accurate critical chip thickness is firstly calculated on the basis of theoritical analysis. A macro-micro cutting model is created based on the brittle-ductile transition mechanism. Finally, the results of study are testified through experiments.

Abstract: In ultrasonic vibration assisted grinding (UAG) along the axial direction, the machining process of an abrasive grit is introduced in this paper. During the internal UAG, the critical speed is determined by the amplitude and frequency of ultrasonic vibration. During the surface UAG, the cutting model of an abrasive grit is established and the cutting trace length of an abrasive grit and the grinding force making chips deformation is analyzed in theory. The analysis results show that the cutting trace length is longer by introducing ultrasonic vibration along the axial direction; the grinding force is decreased, the higher vibration amplitude and frequency is helpful to the decrease of the grinding force and the higher grinding wheel speed weakens the contributiveness of ultrasonic vibration to the decrease of the grinding force.