鑫盛机床在数控丝杠磨床上的新突破

安阳鑫盛机床有限公司SK7450×9000数控超长丝杠磨床的开发成功,填补了国内空白。这台长12米、重63吨的大型数控设备主要用于超长精密滚珠丝杠外圆和滚道的磨削。从技术上解决了国外同类产品需二次装卡和对接磨削的缺点。本机床的设计突破了传统丝杠磨床的结构,采用了磨头移动式结构。磨头砂轮可在砂轮架上±20°范围内摆动,以满足不同导程螺纹磨削的需要;数控系统采用SIEM EN S公司的SIN U M ER IK840D控制系统。机床各进给电机均为伺服电机,工件主轴上配置高分辨率圆光栅,轴向进给方向配置直线光栅尺,由此可实现螺纹磨削的全闭环…     

国内大规模数控丝杠磨床在汉江公司研制成功

汉江机床有限公司为适应国内超长精密丝杠外圆和滚道磨削的需求,重点开发出系列数控丝杠磨床新产品,即,SK7432×4M数控丝杠磨床,SK7450×10M数控丝杠磨床,该机床是集数控螺纹磨床各项关键技术于一体的大型精密设备,填补了国内大规模螺纹磨床生产空白,目前已小批量生产。SK7432×4M数控丝杠磨床是汉江机床有限公司2005年研制成功的高精度数控机床,主要用于加工长度4000毫米、安装直径φ320mm以内的梯形丝杠和滚珠丝杠。机床配置SIEMENS840D高档数控系统可控制六轴并实现三联动。采用SIEMENS电子齿轮箱,扩大了导程范围并易于编程。…     

陕西省汉江机床有限公司

数控滚珠螺母磨床SK7612（HJ031）数控滚珠螺母磨床是汉江机床有限公司研制开发的四轴三联动数控内螺纹、外国磨削加工中心,可在一次装夹中完成滚珠螺母的外圆、端面和内螺纹的加工,并可根据用户需要配备滚压轮修正器、MARPOSS外圆测量装置。本机床主要适用于滚珠丝杠厂、汽车转向器厂以及其它机械制造行业、用于磨削单件、多品种及大批量双圆弧滚珠螺母。     

超长数控滚珠丝杠磨床砂轮振动分析及防治措施

把砂轮架系统抽象成物理模型,对超长数控滚珠丝杠磨床磨削过程中砂轮产生振动的原因进行了理论分析,并通过重新设计改进磨床结构,有效地解决了砂轮的振动问题。     

可编程序控制器(PLC)和触摸屏在数控单晶硅磨床中的应用

简要介绍了数控单晶硅磨床触摸屏的设置与编程方法.重点分析了用于太阳能行业的数控单晶硅磨床的使用情况.根据要求,选用了可磨削经切方后磨削棒料的外圆数控磨床控制系统.针对数控单晶硅磨床工作台纵向移动及砂轮架横向移动采用伺服电机滚珠丝杠拖动、头架转速由变频电机实现无级调速的电气控制系统,进行了最佳参数设置.使用可编程序控制器...     

滚珠丝杠精密磨削表面加工质量及其试验研究

通过正交试验设计和单因素分析法对滚珠丝杠滚道磨削工艺开展了试验研究,分析了磨削时砂轮粒度、砂轮速度、丝杠速度以及磨削深度对滚珠丝杠表面质量影响的主次顺序,得出了各工艺参数对表面质量的影响规律,为丝杠和螺母磨削工艺参数的选择提供了依据。另外试验研究了滚道表面质量对滚珠丝杠副摩擦力矩和噪声性能的影响,明确了滚道表面粗糙度和摩擦力矩之间的关系。试验结果表明,提高丝杠滚道表面加工质量能够有效降低滚珠丝杠副摩擦力矩和噪声。     

10m数控外加圆磨床在汉江研制成功

被汉江机床有限公司列为2008年度重点科技攻关配套项目之一的10m数控外圆磨床,8月中旬顺利完成装配调试,各项性能指标均达到设计要求,现已通过专家组验收并投入企业生产。该机床配置的SINUMERIK 820D数控系统可实现砂轮架的纵、横向两轴联动,主要磨削长度为10m、直径为250mm以内滚珠丝杠的各段外圆。10m数控外圆磨床的成功研制,对实现重大装备国产化和促进汉机公司滚动功能部件产业的快速发展有着重大意义。     

机床滚珠丝杠副的应用维护及市场化修理（四）

(3)滚珠丝杠滚道的修复方法①滚道轻微局部研伤。可用金刚锉或油石将研伤起线的部位局部修整平滑。②滚道整体轻微研伤。将滚珠丝杠置于螺纹磨床两顶尖间,找正后精磨。应严格控制修磨量,不能太大,这样修出来的丝杠副可不更换丝母,通过调隙或更换稍大点的滚珠来恢复其功能及精度。③滚道严重研伤。将滚珠丝杠同上法在螺纹磨床上磨削。修磨量根据研伤程度确定,并按相近直径系列的钢球尺寸进行精磨。     

超长数控滚珠丝杠磨床砂轮振动分析及防治措施

本文对于超长数控滚珠丝杠磨床砂轮振动的原因进行分析,重点分析砂轮架系统的物理模型,以及对于磨床丝杠结构进行改进后如何有效解决了振动的问题。     

汉机公司成功研制10m数控外圆磨床

被汉江机床有限公司列为2008年度重点科技攻关配套项目之一的10m数控外圆磨床,经过科研人员连续4个月的艰苦努力,9月中旬顺利完成装配调试,各项性能指标均达到原设计要求,现已通过专家组验收并投人企业正常生产。该机床配置的SIEMNC 802D数控系统可实现砂轮架的纵、横向两轴联动,主要磨削长度为10m、直径为250mm以内滚珠丝杠的各段外圆。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...