冷弯中梁轧辊孔型的计算机辅助设计

介绍了铁道货车用冷弯中梁成型与普通冷弯型钢成型的不同之处,分析了冷弯中梁的设计难点及解决方案.给出了冷弯中梁的成型原理、成型道次分配及孔型尺寸的确定方法.建立了数学模型;并应用计算机辅助孔型设计计算了冷弯中梁各架次孔型尺寸;进行了孔型优化.对冷弯中梁辊式成型的轧辊结构进行了设计.     

基于ANSYS的槽钢辊弯成型过程有限元分析

通过有限元软件ANSYS/LS-DYNA对槽钢辊弯成型过程建立有限元模型,分析该过程中应力、应变和位移场情况,得到了槽钢在该过程中的变形特点和规律。研究结果为冷弯型钢产品的开发、孔型的设计等问题提供了预测模型,是对辊弯成型理论的补充,可以作为生产实践的有益参考。     

外卷边槽钢辊弯成型过程模具的设计及可靠性分析

根据弹性变形和塑性变形的基本原理,利用ANSYS有限元软件对冷弯型钢外卷边槽钢辊弯成型过程进行模拟,并分析了成型过程中各种型材工艺参数对板材冷弯的影响。该分析不仅可以充实辊弯成型理论,同时对设计新的辊弯模具及模具优化具有促进意义。     

高速公路护栏板的轧辊孔型及配辊设计

在比较冷弯型钢各种成型方法的基础上，制定了高速公路护栏板的成型工艺，并成功地进行了轧辊孔型及配辊设计。用该套辊系生产的护栏板， 其尺寸精度及表面质量完全满足了国标要求， 继在京石高速公路保定段使用后， 又在太旧高速公路得以应用， 为太旧路的建设作出了贡献     

空心工字钢冷弯成型过程的数值模拟

空心工字钢是一种新型断面型材,它由铜板经冷弯成型机组在室温下冷弯成两块近似M形型钢后再焊接在一起而成.设计了一种冷弯成型孔型系统,并利用Pro/E软件建立了空心工字钢冷弯成型机的虚拟样机.采用三维有限元方法,利用ANSYS-LS/DYNA软件对冷弯成型过程中的弹塑性变形过程进行了数值模拟,系统地分析了成型过程中的应力变化规律.研究结果对于冷弯型钢产品的开发、孔型系统的设计具有参考价值.     

型钢轧制动态链式模型及其智能Agent变形分析研究

冷弯型钢和焊管是广泛应用的型材,但其成型机理较难描述。针对实际冷弯成型轧制过程,为了更精准地进行应力应变分析,提出了轧制过程的动态链式模型,在样条有限条法的基础上,利用该模型研究实际轧制过程中结点与链的变形分析方法,给出链式结构结点的孔型应力应变数学描述式,并在此基础上给出了结点的智能结构。对每个结点和链建立对应的Agent,建立各Agent的知识规则,实现利用链式模型分析冷弯成型轧制过程的新方法。为建立新的复杂断面孔型设计算法提供理论基础。     

一种用于电力二次设备机柜的冷辊弯型钢

首先概括介绍了冷弯型钢辊轧成型工艺,其次着重阐述了一种电力二次设备机柜冷辊弯型钢结构设计,并进行了全面的刚强度计算分析,分析表明,此冷辊弯型钢完全满足性能需求,同时对采用此冷辊弯型钢加工的机柜进行静载荷及动载荷试验验证,从而在理论和实践上验证了此冷辊弯型钢的合理性和可行性,为今后电力二次设备机柜及冷弯辊轧类产品设计、制造提供了经验.     

冷弯辊型设计过程知识表示与推送

提出了冷弯型钢成型辊的设计中的知识获取和重用框架,表述了冷弯辊型设计过程中各个阶段知识的特点.进而通过对冷弯辊型设计过程知识应用的特点进行分析,提出了面向设计过程的冷弯知识表示和推送的模型,实现了冷弯知识管理的精确化;通过对推送理论的研究应用,提出半主动推送模式,实现知识经验的有效重用,对其他设计类型的知识管理具有指导性.     

基于Pro／Engineer的变截面冷弯成型机三维动态仿真

变截面冷弯成型产品作为重要构件在建筑、汽车制造、传播制造、电子工业等许多领域得到了广泛的应用,这些领域对变截面的产品有很大需求,变截面冷弯成型机组可以生产变截面冷弯型钢产品.采用计算机技术的变截面冷弯成型成为辊式冷弯成型技术的发展方向.虚拟样机技术可以在实际制造物理样机之前对产品进行设计修改,提高产品性能,加速新技术向新产品的转化.利用Pro/Engineer建立变截面冷弯成型机的虚拟样机模型,并对变截面冷弯成型机的运动情况进行仿真分析,为设计人员提供进一步的理论设计依据,为物理样机的研制提供技术支持.     

冷辊轧成型的弯扭曲校正

在冷辊轧成型加工中,由于设备加工和安装误差,工件产生弯扭曲变形是不可避免的。故常在辊轧机出口处增加校正装置,以防止变形。本文介绍了在轻型辊轧机上,不改变设备结构,利用轧辊对弯扭曲的影响进行校正的方法。一、辊轧机简介辊轧机以10kW电机为动力,装有8组轧辊,前两组为导向输送轮,3～7组为成型轮,第8组为定形     

Analytical model for predicting the surface profile of a work piece in round-to-2-R and square-to-2-R oval groove rolling

This paper presents an analytical model that predicts the surface profile of a workpiece in a round-to-2-R oval groove and a square section-to-2-R oval groove rolling sequence. “2-R oval” indicates a profile of the roll groove that has two different radii of curvature. Using low carbon steel (S10C) and stainless steel (STS304), we conduct a hot groove rolling experiment to verify the robustness of the proposed model. Results show that the predicted surface profile and exit cross-sectional area are in good agreement with experimental results. The second radius of curvature of the 2-R oval groove is important in reducing the exit cross-sectional area of the workpiece and partly squeezing the workpiece outward (i.e., in the roll gap direction) when in contact with the workpiece. Therefore, the surface profile of the workpiece in the 2-R oval groove is smaller than that of the 1-R oval groove.     

ф12mm圆钢三线切分工艺改进

针对ф12 mm圆钢三线切分生产过程中存在的问题进行分析,通过对粗、中、精轧孔型系统实施工艺改进,实现了ф12 mm圆钢三线切分正常生产。     

904L不锈复合板的焊接制造

介绍了 90 4L不锈复合板焊接坡口选择及焊接和热处理工艺的制定     

不锈钢精加工正角刀片槽型的设计

通过分析两种进口精车不锈钢断屑槽刀片,对该正角刀片的槽型进行测绘并进行切削对比试验,系统分析其槽型结构。结果表明:刀片的前角、刃宽和复合断屑台在加工不锈钢时对断屑起关键作用。通过试验、综合分析和验证后,确定不锈钢精加工正角刀片槽型最优结构为5°单前角、0刃宽和复合断屑台。     

A study of the peeling of the built-up edge from a cutting tool during the discontinuous machining of a carbon steel and its effect on tool life

A built-up edge repeatedly forms and peels from the rake face of a cutting tool during the machining of a carbon steel. The mode of peeling and its effect on the tool life during the discontinuous machining of a carbon steel was investigated. The built-up edge peeled from the tool rake face when the tool entered a groove in the surface of the carbon steel. This significantly affected the tool life.     

Experimental and numerical studies for the forming groove and separating groove design in slit rolling process

This paper presents a design method of the forming groove-to-separating groove rolling sequence used in slit rolling process. Based on the equivalent rectangle approximation, we have designed the forming groove which produces a peanut-shaped cross section via rolling from workpiece with an inlet (incoming) square cross section. The separating groove is designed by lowering its width and height in the ratio of 1:3 for the given reduction ratio. With the forming groove and separating groove designed by the proposed design method, we have performed a pilot rolling test at high temperature (around 1000°C) using low carbon (0.1%C) steel and have also carried out finite element analysis to examine the expansibility of the proposed design method. The Results reveal that if the ratio of the roll diameter over the side length of a square is in the range of 4.0 ∼ 8.0, the design method proposed in this study can be systematically applied to design the forming groove-to-separating groove without relying on in-house databases and/or on-site experience.     

球体镀铬对圆弧槽强度及其使用寿命的影响

分析了阀杆对低强度钢或铜合金球体圆弧槽剪切破坏的原因。提出了球体及其圆弧槽的镀铬工艺方法，并进行了球体镀铬后的耐磨性试验。     

A novel deep groove machining method utilizing variable-pitch end mill with feed-directional thin support

A novel method for deep groove machining is developed which utilizes a long-shank variable-pitch end mill with a feed-directional thin support in this research. Recently, thin and tall ribs are required for many parts to reduce their weight and material consumption without sacrificing their stiffness and strength. It leads to necessity of deep and narrow grooves in dies and molds for their mass production. However, such deep groove machining is difficult, since long flexible end mills cause severe chatter vibrations induced by regeneration and mode-coupling. There have been many studies on the regenerative chatter vibration, while there have been few studies on the mode-coupling chatter vibration. Both chatter vibrations need to be suppressed in the deep groove machining. In this study, the regenerative chatter vibration is suppressed by employing one of the conventional methods, i.e. a variable-pitch end mill. On the other hand, there is not a good method to suppress the mode-coupling chatter vibration in the deep groove machining. Therefore, a new suppression method is proposed in which the long-shank variable-pitch end mill is supported with a thin plate in the feed direction. The support device and the long-shank variable-pitch end mill are developed and applied to machining of hardened die steel. Validity of the proposed method is verified both analytically and experimentally in this study.     

基于抛物线型截面曲线接触点实际齿廓的根切研究

摆线盘是摆线钢球减速器减速机构的重要组成部分,槽深相同情况下采用V型截面曲线效果优于圆弧截面曲线,本文在V型截面曲线基础上提出了抛物线型截面曲线。研究表明钢球拟合深度相同时,抛物线型截面,开口更小、槽深更浅,在减少摆线盘根切的同时减少切除量,增加摆线盘的整体强度和稳定性。提出通过改变抛物线截面曲线方程,改变钢球与摆线盘的接触点,从而实现避免接触点被根切的设计方法,并通过实例验证该方法的有效性。     

研磨盘沟槽偏置的研究

简要分析了研磨盘沟槽形状对钢球加工质量的影响.通过对钢球运动和受力分析,得出加工过程中各参数之间的关系,运用一定的数学运算工具,分析研磨盘沟槽内、外偏置时,钢球自转与公转速度的变化,从而实现对研磨盘沟槽的优化设计.