基于遗传算法的复杂槽型铣刀片槽型参数优化

针对三维复杂槽型铣刀片槽型优化问题,进行了铣削温度和铣削力试验及其有限元分析,以铣刀片耦合场最优为优化目标,建立了槽型参数多目标优化数学模型,利用遗传算法求解了固定切削参数和给定约束下的优化槽型参数。仿真计算结果表明,槽型优化后的铣刀片耦合场明显优于其它槽型参数下的铣刀片耦合场,为铣刀片三维复杂槽型的重构提供了依据。     

基于ANSYS分析的不同槽型铣刀片切削性能研究

在铣削加工45钢试验基础上,采用ANSYS有限元分析进行几种不同槽型铣刀片切削性能研究。首先,应用铣削力测试系统及正交试验设计法,进行几种不同槽型铣刀片加工45钢试验,比较分析它们的切削性能,并进行了槽型优选;其次,在切削试验基础上,采用有限元分析方法对几种不同槽型铣刀片进行了应力场分析。有限元分析结果和试验结果吻合较好。上述研究工作为铣刀片槽型的开发及优化打下一定的理论与试验基础。     

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。     

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。     

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。     

基于BP神经网络的波形刃铣刀片模糊综合评判系统

针对波形刃铣刀片耦合场的非稳态特性,基于铣削温度和铣削力试验以及有限元分析,利用BP神经网络LM算法预测了铣刀片温度场和应力场;运用模糊数学理论,根据加工要求和专家分析,用VC++开发了波形刃铣刀片模糊综合评判系统。该系统可对多因素作用下的铣刀片温度场、应力场和耦合场的优劣进行评判,为铣刀片三维复杂槽型的重构提供依据。     

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.     

三维复杂槽型铣刀片铣削温度试验研究

该文研制了一套铣削瞬时切削温度测量系统。利用该系统对三维复杂槽型铣刀片进行了铣削温度的测量研究。试验结果揭示了瞬态铣削温度的变化规律，为铣刀片温度场分析奠定了基础。     

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.     

三维复杂槽型铣刀片受力密度函数分布规律的研究

文中针对哈尔滨理工大学开发的波形刃（前刀面为波形曲面）铣刀片,进行三维复杂槽型铣刀片受力密度函数分布规律的研究。在已建立的铣削力数学模型的基础上,通过铣削力试验以及刀一屑接触面积的试验,建立三维复杂槽型铣刀片前刀面的受力密度函数;对表面受力密度函数进行定量分析计算,编制计算程序对表面受力密度函数分布模型进行三维图形表示,从而分析其分布规律,为铣刀片应力场分析及槽型优选的研究打下理论基础。     

Investigations on the dust distribution characteristics of dry milling using inserts with various groove profiles

Dry milling experiments were conducted using five types of milling inserts with various groove profiles in order to investigate the dust distribution characteristics during the dry milling process. Firstly, the experimental scheme and testing system were designed. Secondly, dry milling experiments were carried out based upon orthogonal and single factor experimental methods, and the experimental data was collected. Next, the experimental results were analyzed, and the influence rule and action mechanism of insert geometrical parameters and milling factors on the dust concentration during the dry milling process were studied with the goal of targeting the profiles of inserts that produced less dust. MATLAB was used to interpolate and simulate the experimental data so as to further investigate the spatial distribution characteristics of dust particles around the machine tool. Finally, a dust capacity prediction model was established and validated. Our research findings will aid in improving the environmental quality of dry milling using inserts with complex groove profiles as well as provide theoretical and experimental basis for an in-depth study on the development technology of groove profiles.     

高强度钢加工不同槽型铣刀片冲击破损实验研究

采用几种适合加工高强度钢的不同槽型铣刀片,通过对大型化工设备热壁加氢反应器的主体件——筒节材料3Cr-1Mo-1/4V(2.25Cr-1Mo-1/4V)钢的面铣加工,进行铣刀片冲击破损的实验研究。首先,采用正交试验设计法,进行几种不同槽型铣刀片加工高强度钢试验,通过试验揭示不同铣刀片冲击破损失效形式的差异;其次,在大量、系统的冲击破损试验基础上,采用数理统计的方法建立冲击破损寿命累积分布函数数学模型;进行冲击破损平均寿命比较,从而对不同槽型铣刀片进行优选。研究成果为实际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打下理论与试验基础。     

基于Deform的枞树型轮槽铣刀加工仿真研究

利用三维建模软件PRO/Engineer,建立枞树型轮槽铣刀模型。运用专业的塑性成形非线性有限元分析软件DEFORM-3D软件,对轮槽铣刀铣削加工汽轮机转子材料的过程进行了动态模拟仿真,并且获得了切削力、切削温度和工件残余应力等数据。分析了轮槽铣削加工仿真过程中切削力、切削温度、工件残余应力等影响因素。     

Research on tool path planning method of four-axis high-efficiency slot plunge milling for open blisk

The great mass of machining allowance for blisk is removed in the rough milling, so improving the rough machining efficiency for the blisk’s tunnel is the key of realizing high-efficiency machining of blisk. According to the structure characteristic of open blisk’s tunnel, a four-axis plunge slot rough milling with high-efficiency and low machining cost is advanced. First, the plunge slot process for blisk and the generation process of the ruled enveloping surface for the freeform surface of the blisk’s blade are put forward. Then, the generating method of the ruled enveloping surface for the blade’s freeform surface and the tool path generation method of four-axis plunge slot milling for blisk are studied. The rough milling region of open blisk’s tunnel is determined by generating the ruled enveloping surface of blade’s offset surface, and the algorithm of tool path for four-axis plunge milling is given. When using a ruled surface to approach a freeform surface, the problem of getting boundary is solved, and the error from the calculation of tool path is avoided by the algorithm. At last, the experiment shows that comparing to the traditional side slot milling, the cutting force of four-axis plunge milling can be reduced by 60% and even the rough machining efficiency can be increased to more than double.     

Research on the modeling of burr formation process in micro-ball end milling operation on Ti–6Al–4V

Burrs generated along the finished edges and surfaces in micro-milling operation have significant impact on the surface quality and operational performance of the finished parts and microstructures. In order to obtain a better recognition of burr generation process, 3-dimensional micro-ball end milling operation FEM models on Ti–6Al–4V have been established. As a result, a newfound type of burr lying on the slot base has been detected. According to their generating locations, burrs discovered in the simulation are classified into four types: entrance burr, exit burr, top burr, and slot base burr. Their formation processes, especially the generation procedure of slot base burr, are carefully investigated and analyzed. Furthermore, the correlation between cutting parameters and top burr sizes in micro-ball end milling is investigated. At last, effective validation experiments for the proposed model are conducted and good agreements are achieved in the morphologies of burrs between the experiments and simulations. It can be concluded that the adoption of a small ratio of axial depth of cut to the mill radius has a significant effect in the reduction of top burr generation in micro-ball end milling operation.     

微铣削中考虑刀具跳动的瞬时切厚解析计算方法

通过研究刀具实际切削过程中的余摆线轨迹及其影响,提出一种新的瞬时切厚解析计算方法,并针对两齿、四齿的情况给出瞬时切厚的具体计算公式。在两齿和四齿铣槽工况下,分析刀具跳动量和跳动角度对各齿切削过程的影响。该方法考虑刀具的综合径向跳动(包括主轴跳动,刀具制造安装误差等综合形成的径向跳动值),适用于微铣削中任意齿数刀具瞬时切厚的计算。通过与宏观铣削中的传统切厚计算公式、BAO模型和Newton-Raphson等数值法对比,量化指出了微细铣削加工与传统宏观铣削加工的一些不同,同时验证了提出的方法具有计算简洁、精度高和通用性强的优势。基于该模型进行了微铣削铣槽试验中切削力的预测,预测结果和试验结果相符良好,验证了模型的正确性和实用意义。     

毛刷式数控钝化机在重型铣削刀片刃口钝化中的应用

简要介绍了可转位刀片刃口钝化的作用及型式.通过在BP-MX型毛刷式数控钝化机上进行钝化试验,确定了两种重型铣削刀片刃口的合理钝化参数,并分析了该机床的加工效率.     

在普通铣床上加工倒角面的铣刀设计

机械零部件中倒角面的应用非常广泛,根据零件的不同,加工倒角的方法也各不相同,在铣床上主要加工一些板类零件、部分孔类零件以及槽类零件的倒角面。通过设计一种倒角铣刀来加工各种板类零件和槽类零件的倒角面,解决在铣床上的倒角问题,改善加工工艺,提高生产效率。     

新型硬质合金可转住T形槽铣刀

分析了标准Ｔ形槽铣刀存在的问题，介绍了新型Ｔ形槽铣刀的结构特点及其应用范围。     

Effects of Cutting Parameters on Tool Insert Wear in End Milling of Titanium Alloy Ti6A14V

Titanium alloy is a kind of typical hard-to-cut material due to its low thermal conductivity and high strength at elevated temperatures, this contributes to the fast tool wear in the milling of titanium alloys. The influence of cutting conditions on tool wear has been focused on the turning process, and their influence on tool wear in milling process as well as the influence of tool wear on cutting force coefficients has not been investigated comprehensively. To fully understand the tool wear behavior in milling process with inserts, the influence of cutting parameters on tool wear in the milling of titanium alloys Ti6Al4 V by using indexable cutters is investigated. The tool wear rate and trends under different feed per tooth, cutting speed, axial depth of cut and radial depth of cut are analyzed. The results show that the feed rate per tooth and the radial depth of cut have a large influence on tool wear in milling Ti6Al4 V with coated insert. To reduce tool wear, cutting parameters for coated inserts under experimental cutting conditions are set as: feed rate per tooth less than 0.07 mm, radial depth of cut less than 1.0 mm, and cutting speed sets between 60 and 150 m/min. Investigation on the relationship between tool wear and cutting force coefficients shows that tangential edge constant increases with tool wear and cutter edge chipping can lead to a great variety of tangential cutting force coefficient. The proposed research provides the basic data for evaluating the machinability of milling Ti6Al4 V alloy with coated inserts, and the recommend cutting parameters can be immediately applied in practical production.