三维复杂槽型铣刀片耦合场的数值模拟

为研究三维复杂槽型铣刀片的切削性能和失效机理,运用数值模拟技术对三维复杂槽型铣刀片和平前刀面铣刀片进行了热应力场、热应力与机械应力的耦合场分析。通过有限元分析,得到了两种铣刀片的应力集中区和危险区,经与试验结果对比,证明了有限元分析结果的正确性,说明三维槽型铣刀片具有优于平前刀面铣刀片的切削性能,从而预测在铣刀片上开出合理的槽型能有效地改善切削性能。     

三维槽型铣刀片铣削力试验及应力场研究

用改进后的铣削力测量装置进行了不同槽型的铣刀片铣削力试验。基于铣削试验结果,通过机床坐标系与刀体坐标系统的转换,确立了铣刀片应力场有限元分析的载荷边晃条件。利用ANSYS软件,进行了自主研发的三维槽型铣刀片和平刀面铣刀片的应力场有限元分析。有限元分析及试验结果均表明,三维槽型铣刀片的应力场及抗破损能力均好于平前刀面铣刀片。     

波形刃铣刀片的开发及其铣削力数学模型

在研究铣削机理和试验研究的基础上,开发了一种新型三维槽型铣刀片─—波形刃铣刀片,并在直线刃铣刀片(含大前角铣刀片)铣削力模型的基础上,建立了波形刃铣刀片铣削力模型,同时编制了计算机程序进行预测,为开发设计优选铣刀片槽型提供了理论依据。     

三维槽型铣刀片铣削温度试验及热破损研究

针对铣削加工中铣刀片热破损问题,进行铣削温度试验,基于铣削试验,运用有限元法对引起铣刀片热破损的温度场和热应力场进行数值模拟.有限元分析结果表明,三维槽型铣刀片的温度场和热应力场优于平前刀面铣刀片,与试验结果吻合较好.据此可预测,在铣刀片的前刀面上压制出合理的三维槽型能够改善温度场和热应力场,使铣刀片抗破损能力增强.     

铣刀片力-热耦合物理场有限元分析与模糊综合评判

为获得切削性能更优良的可转位铣刀片槽型,从而改善铣刀片的力-热耦合综合物理场,进行了铣削温度试验和铣削力试验,以铣削时刀片的装夹状况和试验所获得的数据为边界条件,对带有三维槽型的波形刃铣刀片和平刀片分别进行了力-热耦合物理场有限元分析.基于模糊数学理论,建立了铣刀片耦合场的模糊综合评判模型,对两种铣刀片的力-热耦合物理场进行了模糊综合评判.结果表明,优化铣刀片前刀面的槽型可明显改善切削性能.     

基于二维元胞自动机的铣刀片温度场算法研究

切削热是铣刀片磨损和破损产生的重要原因.对铣刀片温度场研究的传统方法是有限元法.为了实现三维复杂槽型铣刀片槽型优化中能直接利用分析得到的数据进行自组织动态设计,文中结合切削温度试验,利用元胞自动机理论对铣刀片温度场进行研究,建立了二维波形刃铣刀片温度场算法系统,得出切削中各点的温度场,为刀片槽型重构奠定基础.     

不同槽型铣刀片的切削温度场分析

对三种槽型的铣刀片进行了切削温度试验 ,根据切削条件建立了温度场有限元分析的边界条件 ,并对不同槽型铣刀片的三维温度场进行了有限元分析 ,为铣刀片槽型的设计和优选提供了参考依据     

复杂槽型铣刀片三维温度场分析及其模糊综合评价

建立了三维复杂槽型铣刀片的参数化模型,提出并建立了刀具表面受热密度函数,根据受热密度函数确定了边界条件,对铣刀片的温度场进行了有限元分析;运用模糊数学理论对铣刀片温度场进行了模糊综合评判,以确定其优劣,为铣刀片三维复杂槽型的重构提供依据。     

加工碳素结构钢的三维复杂槽型铣刀片冲击破损实验研究

文中针对哈尔滨理工大学开发的三维复杂槽型波形刃铣刀片和平前刀面铣刀片,通过对碳素结构45钢的面铣加工进行了刀片冲击破损的实验研究。首先进行铣刀片三维应力场有限元分析及模糊综合评判,预测出波形刃铣刀片的抗冲击破损性能优良：其次,通过试验揭示不同铣刀片冲击破损失效形式的差异;通过大量、系统的冲击破损试验,建立冲击破损寿命累积分布函数数学模型,证明波形刃铣刀片的抗冲击破损性能优良。上述研究成果为解决自动化生产中刀具破损这一关键技术问题及槽型优选技术的研究提供了理论与试验基础。     

三维复杂槽型铣刀片粘结破损实验与槽型优选的研究

针对哈尔滨理工大学开发的三维复杂槽型波形刃铣刀片和平前刀面铣刀片,通过对耐热钢的面铣加工进行刀片粘结破损实验及槽型优选研究。首先,进行铣刀片三维温度场有限元分析,预测出波形刃铣刀片的抗粘结破损性能优良;其次,通过对温度场的模糊综合评判,预测了波形刃铣刀片的优越性能;最后,通过对难加工材料3Cr-1Mo-1/4V钢的面铣加工的实验研究,揭示了刀具粘结破损的实质,建立了铣削温度与前刀面最大粘结破损深度之间的数学模型,分析了铣削温度对刀具粘结破损的影响规律,并证明了波形刃铣刀片切削性能的优越性。     

硬质合金铣刀片粘结破损的研究

针对铣削难加工材料时刀具粘结破损问题，进行了用平刀片和自主研发的复杂槽型铣刀片切削3Cr1Mo1／4V高温耐热钢的测温测力试验，同时采用高速摄影观察了铣刀片切入切出时粘结切屑脱落过程，应用有限元法分析了粘结破损时温度场和应力场耦舍后的等效合成应力。理论和试验数据分析结果表明，粘结破损的主要原因是工件和刀具材料的亲合力、铣刀片的等效合成应力大于硬质舍金的强度，改变铣刀片的槽型是提高抗粘结破损的有效方法。为三雏复杂槽型铣刀片槽型的优化和重构技术提供了理论依据和试验数据。     

基于密度函数的三维复杂槽型铣刀片物理场分析

以哈尔滨理工大学开发的波形刃(前刀面为波形曲面)铣刀片为例,在铣削力数学模型基础上,通过铣削力试验以及切屑与前刀面接触面积试验,建立了三维复杂槽型铣刀片前刀面的受力密度函数;基于该函数,对波形刃铣刀片进行了应力场分析。在铣削温度数学模型基础上,运用传热学理论,建立了波形刃铣刀片表面受热密度函数;基于该函数,对波形刃铣刀片进行了温度场分析。这些研究结果可为槽型优选技术的研究打下理论基础。     

Experimental study on adhesive wear of milling insert with complex groove

This paper presents an experimental study on the adhesive wear of a milling insert with complex groove when milling 3Cr-1Mo-1/4V and 0Cr18Ni9 steels. Experimental measurements of milling temperature and milling force were performed. Then the adhesive behaviors and mechanisms between the steels and uncoated carbide were analyzed and discussed. It is found that the high temperature gradient, thermal stress, alternate compressive stress, and tensile stress in cut-in and cut-out, provide a situation for adhesion. Some suggestions for avoiding adhesive wear and the mechanism of adhesive wear of the insert are presented.     

不同槽型铣刀片铣削过程振动分析

机械加工中工艺系统的振动破坏了零件的加工精度。刀具与工件之间的冲击力是引起振动的主要原因之一。通过对带有三维复杂槽型的波形刃铣刀片与平前刀面铣刀片铣削力和铣削振动的对比试验、铣削力的有限元数值模拟,表明带有三维复杂槽型的波形刃铣刀片铣削力小,铣削过程中引起工艺系统的振动较平稳。可以断言,优化刀具的结构与几何参数可有效地减小铣削过程的振动现象。     

基于应力场分析的铣刀片冲击破损目标函数研究

以哈尔滨理工大学开发的波形刃(前刀面为波形曲面)铣刀片为例,以最小冲击破损为目标,进行铣刀片槽型优化目标函数的研究。在已建立的三维复杂槽型铣刀片受力密度函数的基础上,进行铣刀片不同切削参数下的应力场有限元分析,应用模糊数学理论对应力场进行模糊综合评判,建立应力场模糊评判结果与冲击破损切削参数之间的目标函数关系,从而进行目标函数的槽型优化设计。本研究为铣刀片的开发及解决自动化生产中刀具破损这一关键技术问题打下理论基础。     

A new approach to the analysis of high-speed milling in the case of chipped inserts

High-speed milling permits to machine materials with increased productivity. For a reliable application of this strategy, it is crucial to avoid tool chipping during the machining; in practice, this implies underestimating tool life. The formation of chipping induces vibrations, high temperature on tool nose, and poor surface quality. This is a problem when it represents the last operation. A better comprehension of how a damaged insert works is useful to design a reliable monitoring system. More researches use several sensors to monitor the health state of the milling tool, like force signal, current signal, acceleration, acoustic emission, etc., and complex elaboration systems have been considered. The objective of this paper is the proposal of a model to analyze the chipping of multi-tooth milling tool. First milling tests are carried out on a milling center and cutting forces are measured. The experimental data were elaborated and a suitable model is set up. The finite element method (FEM) is considered and simulations were performed using SFTC Deform 2D^TM, a Lagrangian implicit solutor. The material model and the friction law are calibrated following an appropriate procedure. In this work, face milling using multi-tooth milling tool is considered. Face milling are very common operations in several industrial sectors. The results show the FEM model is able to simulate the standard deviation of feed force during the chipping. A regression model between chipping scar dimension and feed cutting force is presented in order to summarize the obtained results.     

3D FEM Simulation of Milling Force in Corner Machining Process

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.