基于WinCC组态的数字化改性沥青防水卷材成型线控制系统

某厂防水卷材成型线根据生产实际情况及工艺控制要求,应用工业组态软件WinCC进行了成型线数字化控制系统的开发设计。重点介绍了WinCC与生产线多个PLC之间的通讯连接、数据交换、实时监控等,编写了三菱Q系列、FX5U系列PLC的控制程序,并通过本体以太网组网,进行了WinCC文件的建立、与PLC变量的连接、操作画面的设计以及报表系统的生成。

函数合成法生成型线与光顺

本文以组成船体型线单元曲线的不同特点,建立了相应的描述函数,并经加权合成后,成为生成船体横剖线的参数调和方程。同时利用B样条函数的连接和局部修改功能,把型线生成,图像显示,人机交互,曲线修改和光顺性判别互为一体,形成了独特的方法,具有良好的控制和人机交互设计型线的功效。

带局部成型线的包装纸盒设计方法

为了打破传统折叠纸盒直上直下的设计风格,增大包装折叠纸盒内部的容装空间,并拓宽主展示面,对管式折叠纸盒与异型包装折叠纸盒的结构增加了局部成型线设计。采用ESKO设备进行打样。通过改变局部成型线在盒型上所处的位置、长度、倾斜角、弯曲度等要素来改变商品包装的主展示面,增加立体效果,使得折叠纸盒的盒体上下部对比强烈,整体效果张弛有度。对于异型折叠纸盒,在不影响其美观、保护、密封的前提下,引入局部成型线使设计变得更加灵动、异型过渡自然、更具流线感。通过局部成型线,完成纸盒两端异型的转换,实现折叠纸盒盒型多样、美观的设计。

基于低压快排水成型技术的自动化注浆成型线的研究及设计

应企业需求为其开发一套自动化注浆成型线。首先讲述了注浆成型工序面临问题,在对比了几种压力成型工艺后提出结合低压快排水技术的自动化成型线。然后介绍了本生产线关键设备合模和开模专机的设计和整线的生产流程。最后通过企业应用证明了本线的性能。

数字化张力测量技术在改性沥青防水卷材成型线中的设计与应用

介绍了一种在改性沥青防水卷材进口成型线中成功应用的数字化张力测量系统。该系统从硬件和软件两方面着手,通过电气原理设计、传感器选型、机构设计、自动化软件编程设计,经电控、机械配套安装,再到整个系统联动调试和优化,实现了成型线关键环节张力的数字化、可视化,具有安装、调试和维护方便,性价比高等特点。

冰箱内胆多工位成型线输送部分的两种典型结构

在国内电冰箱生产行业中各大生产厂,作为标准配置的生产门体及箱体内胆的多工位真空成型线,其输送部分是将该多工位成型线的各工位串接在一起,是整条生产线能够具有工作稳定性、协调性的基石,因而对于其输送部分结构的合理性、可靠性、稳定性显得尤为重要。目前在此类多工位的真空成型线中,逐步形成了以链条输送结构与夹钳输送结构为主的两大类典型输送结构,本文就此给出了此两类输送结构的简要说明及主要特征。

预成型标线和热熔标线路用性能及环保性对比

道路标线的路用性能和环保性是标线的重要性能,为了给标线选择时提供参考,对预成型标线和热熔标线进行了路用性能对比实验,并采用层次分析法对二者的环保性能进行综合评价。结果表明:通过浸泡实验证明该预成型标线能够满足耐水性以及耐碱性要求;通过构造深度以及摆式仪实验,得到黄色、白色预成型标线、热熔标线的平均抗滑值BPN分别为98、98、78.2,将结果与规定要求长效标线带A、B级抗滑的最小抗滑值对比,看出该预成型标线的抗滑性满足要求,且优于热熔标线;通过自动车辙实验,比较每次实验的标线磨耗量,发现预成型标线的耐磨性优于热熔标线,且与标线耐磨性标准相比,预成型标线符合标准规范要求。研究还发现预成型标线不管在重金属、二氧化碳排放、粉尘及噪声污染哪个方面,相较于热熔标线的优越性都非常显著。预成型标线的路用性能和环保性能相比于热熔标线都有显著的优势,因此在进行标线施划时应考虑采用预成型标线的可能性。

超精密摆线轮成型磨床人造花岗岩床身瞬态热应力分析

热变形是影响超精密摆线轮成型磨床综合精度的重要因素之一,为了探究超精密摆线轮成型磨床人造花岗岩床身在工作中的瞬态热应力、热变形情况,利用三维设计软件和有限元软件协同仿真的方法,建立超精密摆线轮成型磨床人造花岗岩床身模型,通过对床身施加边界条件及相关载荷来获得床身的瞬态温度场,以获取床身的瞬态热变形、热应力。最后,根据超精密摆线轮成型磨床床身热变形及温度场分布状况,提出了改善床身热变形的若干措施。

包芯线成型机自动给料系统设计

本文根据工厂实际生产需求,对包芯线成型机的给料系统进行了自动化改进设计。首先对自动给料系统的总体结构进行了设计,重点是对称量装置(电子皮带秤)的部件进行选型及设计,实现四种合金的称量;然后对传送物料的螺旋给料器进行了尺寸计算,并根据实际情况进行了结构改进;最后对自动给料系统基于以上结构设计所要实现的控制流程进行了设计。最终实现了实现四种合金自动称量配比、测量精度达到0.5%的包芯线成型机自动给料系统。

0.13μm CMOS芯片上窄脉冲成型电路

本文将脉冲功率领域中基于脉冲成型线的窄脉冲产生技术运用于芯片电路设计中,基于0.13μm的CMOS工艺,进行片上电路设计与实现。用CadenceTM Spectre Simulation进行了原理图和版图仿真分析,选用标准的片上共面波导(CPW)作为脉冲成型线(PFL),采用NMOS晶体管作为开关,仿真结果表明在共面波导的长度为268μm时,产生的窄脉冲宽度最小可达8ps。将共面波导长度为4mm的脉冲成型电路进行商业化0.13μm CMOS技术流片,在50Ω负载上测得的脉冲宽度约为160ps,幅值为110～180mV。

添加/快速成型初期的制造成本预估

本文介绍了快速成型的原理及过程。通过对快速成型技术中的线弧添加快速成型(Wire and Arc Additive Manufacture)技术的加工过程进行分析,提出了线弧添加快速成型初期制造价值成本估算方法。主要包括成型材料和基座材料成本、成型加工成本和保护气成本,可为该技术的市场化成本预估提供参考。

人间正道写青春——访杭州市美时利车圈有限公司总经理丁立新

四年多前,我听到传闻:一家座落在钱塘江上游——浦阳江畔原名叫“知青电镀厂”的企业陷入极度的困境。 四年后,我驾车经过这家工厂的门口:那几幢新的厂房,那高大又富气振的办公大楼,那长长的厂牌赫然写着: “中外合资杭州美时利车圈有限公司” 创业的激情,无畏的胆量 几天以后,这个公司的总经理丁立新接受了我的采访。他说,我们这个厂是1980年开始创办的,那时我高中毕业已三年,便奉命同十多个同志一道开始在这里筹建,全部家当是办农药厂不成而留下的两间破棚棚和“知青办”

Effects of the profile of a supercavitating vehicle's front-end on supercavity generation

The authors designed three different front profiles for supercavitating vehicles based on cavity theory and the Granville streamlined equation are designed. Experiments were done using these front profiles in the Northwestern Polytechnical University high-speed water tunnel. The experiments indicated that the critical volume of gas required for supercavitation is affected by the axial distribution of the front-end＇s slope. The experimental data showed critical gas flow rates required for the three designs were less than rood-l, with the greatest decrease 24%. The experimental results also showed the supercavitation generation speeds of the models were faster than mod-1 by up to 32.4%. This verifies that the front profile of a supercaviting vehicle effects supercavity generation speed and critical gas flow rates. The smaller the changes in axial distribution of pressure, the higher the supercavity generation speed. The smaller the changes in curvature distribution of axial, the smaller the critical gas flow rates.

永林公司“高级耐磨地板”投入批量生产

永林牌高级耐磨地板(复合地板)是永安林业(集团)股份有限公司投资引进代表当今世界最先进水平的德国BURKLE和HOMAG公司全套工艺技术和生产设备,按照欧洲标准生产的高品质地板。该项目引进国外设备142万美元,国内设备300万元人民币,总投资2280万元。

Numerical simulation method for weld line development in micro injection molding process

In order to reduce the "trial-mold" risk and cost,numerical simulation method was applied to micro injection molding weld line development investigation. The micro tensile specimen which has the size of 0.1 mm(depth) ×0.4 mm(width) ×12 mm(length) in test area was selected as the objective part,and polypropylene(PP) as the experimental material. Respectively with specific commercial software(Mold Flow) and general computational fluid dynamic(CFD) software(Comsol Multiphysics) ,the simulation experiments for development of weld line in micro injection molding process were executed and the real comparison experiments were also carried out. The results show that during micro injection molding process,the specific commercial software for normal injection molding process is not valid to describe the micro flow process,the shape of flow front in micro cavity flowing which is important in weld line developing study and the contact angle due to surface tension are not able to be simulated. In order to improve the simulation results for micro weld line development,the general CFD software,which is more flexible in user defining function,is applied. The results show better effects in describing micro fluid flow behavior. As a conclusion,as for weld line forming process,the numerical simulation method can give a characteristic analysis results for processing parameters optimizing in micro injection molding process;but for both kinds of softwares quantitative analysis cannot be obtained unless the boundary condition and micro fluid mathematic model are improved in the future.

BLIND AND COMPLETE MODELING OF LINEAR SYSTEMS USING THIRD ORDER CUMULANTS

This paper presents a novel approach to structure determination of linear systems along with the choice of system orders and parameters. AutoRegressive （AR）, Moving Average （MA） or AutoRegressive-Moving Average （ARMA） model structure can be extracted blindly from the Third Order Cumulants （TOC） of the system output ts, where the unknown system is driven by an unobservable stationary independent identically distributed （i.i.d.） non-Gaussian signal. By means of the system order recursion, whether the system has an AR structure or has AR part of an ARMA structure is firstly investigated. MA features in the TOC domain is then applied as a threshold to decide if the system is an MA model or has MA part of an ARMA model. Numerical simulations illustrate the generality of the proposed blind structure identification methodology that may serve as a guideline for blind, linear system modeling.

Non-linear Chemical Process Modelling and Application in Epichlorhydrine Production Plant Using Wavelet Networks

A type of wavelet neural network, in which the scale function isadopted only, is proposed in this paper for non-linear dynamicprocess modelling. Its network size is decreased significantly andthe weight coefficients can be estimated by a linear algorithm. Thewavelet neural network holds some advantages superior to other typesof neural networks. First, its network structure is easy to specifybased on its theoretical analysis and intuition. Secondly, networktraining does not rely on stochastic gradient type techniques andavoids the problem of poor convergence or undesirable local minima.

UG环境中汽轮机叶片汽道建模方法

介绍了采用UG生成汽轮机汽道时叶片汽道型线的特点和叶片型线分类,分别介绍了数据点成型和圆弧线成型的建模方法。

Accessing Alignments of Ontologies via IoT Based on SKOS Data Model

Many ontologies are provided to representing semantic sensors data.However,heterogeneity exists in different sensors which makes some service operators of Internet of Thing(IoT) difficult(such as such as semantic inferring,non-linear inverted index establishing,service composing) .There is a great deal of research about sensor ontology alignment dealing with the heterogeneity between the different sensor ontologies,but fewer solutions focus on exploiting syntaxes in a sensor ontology and the pattern of accessing alignments.Our solution infers alignments by extending structural subsumption algorithms to analyze syntaxes in a sensor ontology,and then combines the alignments with the SKOS model to construct the integration sensor ontology,which can be accessed via the IoT.The experiments show that the integration senor ontology in the SKOS model can be utilized via the IoT service,and the accuracy of our prototype,in average,is higher than others over the four real ontologies.

Linear Programs in Cost Accounting： A Linear Cost Model

This paper aims to find unit cost of a product for firms. It establishes a linear cost model to find unit cost. Linear goal programs assume a direct relationship between independent variable and dependent variable. Dependent variable of linear model is unit cost. Independent variables are cost accounting variables. They are supply cost, labor cost, and administration cost. This study assumes a direct relationship between supply-labor-administration costs and unit cost. Therefore, it establishes a linear cost model. The major research question of this study is to apply linear goal programming to cost accounting. The goal of this linear program is to find unit cost of product. This study uses quantitative method and human capital method. The main research result is linear costing model itself.