Papers by Author: Cai Xu Yue

Abstract: Based on actual working condition, this paper takes the mold materials Cr12MoVwhich is widely used in car cover as research object, and uses the finite element software Deform 3D to establish three-dimensional finite element simulation model of milling hardened steel Cr12MoV process. Reliable material model, chip separation criterion and appropriate boundary conditions are applied. The finite element simulation of milling hardened steel is built with different tilt angles. Milling force of simulation results are verified through experiments.Changes in the milling force with tilt angle are discussed, which can provide certain reference for cutting parameters optimization of milling process and 3D finite element modelling in milling.

Abstract: With the new type of high strength , high hardness difficult machining parts appear constantly, both for the quality of deep processing, durability of the tools, or reliability of the drilling systems are putting forward higher requirements. This paper mainly describes the characteristics of deep-hole drilling systems and applications, and content selection of cutting parameters, impact of cutting speed and feed rate for chip breaking and so do some explanation, These have certain guiding significance for chip breaking can get better. Finally, introduce the deep-hole drilling in the drilling process causes common problems and solutions, to provide some references for practical manufacture process.

Abstract: This paper focus on automobile panel dies and moulds, studying the sliding friction phenomenon between tools and workpiece caused by inadequate margin adopted during finishing. Based on this, the forecasting model of the limit milling depth is built with the consideration of tool deformation. Further on, the model built is tested by milling experiments with different radii of curvature, and providing the evidence for adoption and optimization of margin of steel finishing.

Abstract: The high-speed milling experiments on hardened Cr12MoV steel were carried out with ball end milling cutter of different edge parameters. The influences of helix angle and rake angle on tool life and surface roughness were focused on. Meanwhile, the impacts of edge parameters on cutting edge stiffness and flank wear were analyzed on the condition of high-speed milling. It carried out that smaller helix angle and negative rake angle selected during high speed milling can guarantee quality of surface manufactured as well as longer tool life.

Abstract: Take commonly used materials Cr12MoV for automobile panel mold as object of study, using the finite element simulation software ABAQUS, take the node displacement direction as the criterion of the chip formation, determine the minimum cutting thickness of Cr12MoV materials under different tool edge radius values, this value is determined to selection and optimization of mold steel milling finishing machining allowance provides a theoretical basis.

Abstract: With the rapid development of machinery industry, the processing parameters which affect on the quality of the products in machining and measuring index also appeared diversified, which makes the study of multi-objective optimization problem is very important. Among the many factors, cutting consumption plays a key role in many indicators, in effect, cutting force and cutting temperature on the quality and performance of products is the most prominent, so this paper takes PCBN tool cutting Cr12MoV steel as the experimental basis, the cutting parameters to optimize the parameters;the cutting force and cutting temperature as the index;with the aid of the BP neural network modeling of cutting force and cutting temperature, at the same time, this paper improved particle swarm optimization algorithm to achieve multiple objectives, provides multi objective optimization parameters more reliable for die steel production process.

Abstract: This article takes common material Cr12MoV for automobile panel die as research object, aiming at difficulties when tool cutting in workpiece which are caused by high material hardness in maching, based on simulation software DEFORM-3D, a high precision simulation model of cut-in process in hard milling die steel is established, and the accuracy of the model is verified by tests, the milling force cut-in process in hard milling die steel is studied, the influence law of different cutting parameters and cut-in angles on milling force in milling cutter cutting in workpiece is analyzed, and the optimized cut-in angles are obtained, this study provides a reference for further optimization of cut-in conditions, reducing tool early damage and improving processing efficiency.

Abstract: Accuracy of cutting simulation model mostly depends on whether its material constitutive equation describes workpiece physical property under cutting state. It is necessary to research on the constitutive properties of cutting material in the high strain state of temperature. In this paper high strength steel GCr15 is used as a research object under the high speed cutting state. By FEM Johnson-cook constitutive model in Hopkinson Experiment is simulated, and the sensitivity of constant on constitutive model is also analyzed. Also influence of temperature on workpiece material stress and strain is revealed. The result provides reference for Johnson-cook model parameters of high strength steel GCr15, and it provides theory basis of material properties analysis in cutting state as well.

Abstract: For its good processing flexible, economic and environmental protection performance, hardened steel GCr15 is used widely in car and energy industry. Although surface quality in machining process is not controlled well, that restricts application of hardened steel GCr15 extensive to a certain degree. Therefore, this study revealed the effect of cutting parameters on surface roughness. Also influence of cutting conditions on surface morphology and organization generation mechanism of subsurface were stuied for high-speed cutting hardened steel GCr15. Appear reasons of plastic side flow on surface was researched. Also, effect of tool wear on surface quality was studied as well. The research results provided theoretical basis for rational choice for high speed hardened steel cutting process.

Abstract: . Large automobile cover die with complex characteristics and high hardness after quenching is mainly applied hard milling. In processing, large tool vibration, short cutting-life and much time-consuming increase the die manufacturing cost. In this paper, the relationships of cutting speed with achining efficiency and thickness with tool life are considered in the optimization method. The optimization method based on VERICUT uses the relationships to improve machining efficiency and tool life, thus reduce the large automobile cover die processing costs. The simulation and the optimization laid the foundation for the follow-up physical simulation and experiment.