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国家自然科学基金(51235003)

作品数:41 被引量:244H指数:11
相关作者:刘献礼吴石李茂月岳彩旭李荣义更多>>
相关机构:哈尔滨理工大学瑞典皇家理工学院佐治亚理工学院更多>>
发文基金:国家自然科学基金国家教育部博士点基金国家科技重大专项更多>>
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41 条 记 录,以下是 1-10
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基于NURBS曲面重构的加工表面形貌仿真及实验研究
淬硬钢以其高强度、良好的热稳定性以及耐磨损等优良的性能,在汽车模具加工等领域得到了广泛地应用,由于汽车外覆盖件模具的复杂性和光顺性,要求淬硬钢模具加工质量较高,本文以Cr12MoV模具钢实验样件的加工表面质量为研究对象,...
刘治京
关键词:淬硬钢表面形貌曲面重构
文献传递
轴向铣削力与陀螺效应对颤振稳定域的影响被引量:5
2013年
首先,分析了轴向铣削力及陀螺效应对球头铣刀刀杆固有频率的影响;然后,基于全离散法研究了轴向铣削力及陀螺效应对球头铣刀颤振稳定域的影响;最后,通过实验验证,该理论模型可以有效预测铣削颤振稳定域。分析表明,随着轴向铣削力的增加,铣削系统的稳态临界切深呈现下降的趋势,但并不是线性关系,在局部会出现稳态临界切深增加的情况,而陀螺效应只是影响系统稳定域的高转速部分,对低转速无效。
吴石渠达刘献礼肖飞
关键词:轴向力陀螺效应
不同硬度拼接模具铣削过程及切削参数反演研究
汽车覆盖件模具的设计及制造约占汽车开发周期的2/3,已成为汽车换改型的主要制约因素。对于大型汽车覆盖件模具而言,由于其自重及尺寸较大,若直接进行整体淬火,则加工难度大,型面精度难以有效控制。采用镶块式淬硬钢模件拼接后整体...
高海宁
关键词:铣削过程参数反演表面形貌多目标优化
应用K-means聚类算法划分曲面及实验验证被引量:5
2017年
针对大型覆盖件模具整体加工质量难以保证问题,采用曲面分片划分的方法,将所选曲面按照一定精度进行离散,通过求取离散点的几何参数和加工参数,将曲面进行粗略划分;采用K-means聚类算法进一步确定划分区域的曲面片数量和聚类中心数,利用Voronoi图算法提取曲面的边界;针对铝合金材料划分后的曲面的不同区域采用不同的加工方式进行加工,通过传统方法与曲面分片方法进行加工对比试验,验证提出方法的正确性及可行性。
吴明阳张芮岳彩旭刘献礼丁云鹏朱磊
关键词:K-MEANS算法VORONOI图铝合金
Adiabatic Shear Mechanisms for the Hard Cutting Process被引量:5
2015年
The most important consequence of adiabatic shear phenomenon is formation of sawtooth chip. Lots of scholars focused on the formation mechanism of sawtooth, and the research often depended on experimental approach. For the present, the mechanism of sawtooth chip formation still remains some ambiguous aspects. This study develops a combined numerical and experimental approach to get deeper understanding of sawtooth chip formation mechanism for Polycrystalline Cubic Boron Nitride(PCBN) tools orthogonal cutting hard steel GCr15. By adopting the Johnson-Cook material constitutive equations, the FEM simulation model established in this research effectively overcomes serious element distortions and cell singularity in high strain domain caused by large material deformation, and the adiabatic shear phenomenon is simulated successfully. Both the formation mechanism and process of sawtooth are simulated. Also, the change features regarding the cutting force as well as its effects on temperature are studied. More specifically, the contact of sawtooth formation frequency with cutting force fluctuation frequency is established. The cutting force and effect of cutting temperature on mechanism of adiabatic shear are investigated. Furthermore, the effects of the cutting condition on sawtooth chip formation are researched. The researching results show that cutting feed has the most important effect on sawtooth chip formation compared with cutting depth and speed. This research contributes a better understanding of mechanism, feature of chip formation in hard turning process, and supplies theoretical basis for the optimization of hard cutting process parameters.
YUE CaixuWANG BoLIU XianliFENG HuizeCAI Chunbin
变质量动力吸振器减振镗杆减振性能研究被引量:6
2018年
在镗削加工过程中镗杆处于悬臂状态导致整体刚度较低,易产生振动,影响加工精度及表面质量,严重时甚至导致零件报废,如何减小振动是镗削加工亟待解决的问题。提出了一种安装变质量吸振器的新型减振镗杆。建立了减振镗杆的动力学模型,分析了激振频率与吸振块质量对减振镗杆减振性能的影响规律。提出通过调吸振器吸振块质量对减振镗杆的减振性能进行调节,从而使减振镗杆的减振性能达到最佳的减振镗杆减振性能调节方法。最后通过分析在不同吸振块质量下主系统的位移变化情况对所提出的减振镗杆的减振性能进行了验证。研究结果对所提出的新型减振镗杆的设计、加工参数的选择及减振镗杆减振性能的调节具有指导意义,为减振镗杆的设计提供了新的设计思路。
刘强刘献礼吴石杨琳李荣义杨浩
关键词:减振镗杆动力吸振器变质量减振性能
铣刀磨损对铣削稳定性及表面位置误差的影响被引量:11
2015年
为了分析刀具正常磨损后铣削颤振稳定域和表面位置误差,对刀具不同磨损状态下的切削力系数进行辨识,基于全离散法研究刀具正常磨损后铣削颤振稳定域和表面位置误差特性。发现当刀具正常磨损后,铣削系统的稳态临界切深呈现上升的趋势;随着工件表面洛氏硬度的提高,铣削系统稳态临界切深逐步下降,刀具正常磨损后临界切深与后刀面无磨损临界切深的差别逐步变小;在稳定域的局部会出现表面位置误差增加的情况。试验表明,该理论模型可以有效优化刀具正常磨损后的加工参数。
吴石刘献礼宋盛罡渠达
面向模具陡峭区的接触式测量误差补偿方法被引量:1
2015年
为了实现大型复杂曲面模具的加工与检测一体化,避免二次装卡误差问题,针对模具的陡峭曲面,利用基于UG二次开发的在机测量系统,提出合理的测量点选择及测量误差补偿方法。对陡峭曲面进行在机测量实验,通过与蓝光数码光栅三维扫描仪得到的测量结果进行比对,验证了该测量误差补偿方法在实际生产中的可行性,为大型复杂曲面模具的测量提供了一种高效、准确、低成本的测量系统。
吴石王正春刘献礼王义文
关键词:接触式测量误差补偿
3D FEM Simulation of Milling Force in Corner Machining Process被引量:2
2017年
To optimize milling force and machining accuracy quality in corner milling process, the changing law of milling force is revealed by Finite Element Method(FEM). Based on DEFORM software a serial of 3D FEM models for corner milling process are devloped. Tool curved trajectory is achieved by establishing accurate relationship of tool location with milling time. Adaptive remeshing technique and iterative algorithm are adopted to ensure convergence of FEM model. Component force characteristics are revealed by analyzing FEM simulation results. It indicates that the milling force in Y direction becomes negative comparing with forces in X and Z direction. Magnitude of forces in three directions decreases with increase of spindle speed, while it increases with increase of milling feedrate. The simulation results for cutting force are in good agreement with those obtained from experiment. The FEM simulation model is first successfully established for corner milling process in this study, and the results provide a guide for optimizing cutting parameters in cutting process.
Caixu YUECui HUANGXianli LIUShengyu HAOJun LIU
Hardening Effect on Machined Surface for Precise Hard Cutting Process with Consideration of Tool Wear被引量:3
2014年
During hard cutting process there is severe thermodynamic coupling effect between cutting tool and workpiece, which causes quenching effect on finished surfaces under certain conditions. However, material phase transformation mechanism of heat treatment in cutting process is different from the one in traditional process, which leads to changes of the formation mechanism of damaged layer on machined workpiece surface. This paper researches on the generation mechanism of damaged layer on machined surface in the process of PCBN tool hard cutting hardened steel Cr12MoV. Rules of temperature change on machined surface and subsurface are got by means of finite element simulation. In phase transformation temperature experiments rapid transformation instrument is employed, and the effect of quenching under cutting conditions on generation of damaged layer is revealed. Based on that, the phase transformation points of temperature under cutting conditions are determined. By experiment, the effects of cutting speed and tool wear on white layer thickness in damaged layer are revealed. The temperature distribution law of third deformation zone is got by establishing the numerical prediction model, and thickness of white layer in damaged layer is predicted, taking the tool wear effect into consideration. The experimental results show that the model prediction is accurate, and the establishment of prediction model provides a reference for wise selection of parameters in precise hard cutting process. For the machining process with high demanding on surface integrity, the generation of damaged layer on machined surface can be controlled precisely by using the prediction model.
YUE CaixuLIU XianliMA JingLIU ZhaojingLIU FeiYANG Yongheng
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