轮胎模具侧板字体CAD/CAM技术应用

UG是一个高端的CAD／CAM系统．借鉴国内外先进技术和经验,近年来各国都在发展先进的模具制造技术并逐步向设计制造技术的系统化、集成化发展。其中CAD／CAM技术是先进制造技术的基础和重要组成部分,本文主要研究字体加工的CAD／CAM的过程,微机版UG系统为支撑环境,根据轮胎模具字体平面图及用户提供的轮胎胎侧曲线图以及软件的CAD／CAM功能建立了三维模型,编制了字体加工数控程序,并在五轴五联数控加工中心上加工出符合要求的轮胎模具侧板字体雕刻。     

轮胎模具活字块加工工艺参数的选择

轮胎模具活字块是模具侧板上重要部件,它与活字块槽的配合精度大于0.02 mm时,轮胎表面就会出现胶边。通过对加工参数的标准设定,活字块的加工精度和表面粗糙度可达到一致,提高了加工效率和加工质量。     

轮胎模具电极CAD/CAM技术应用

主要阐述了运用高端CAD／CAM软件UG进行轮胎模具电极加工的过程,实现了轮胎模具电极的三维造型及数控加工,提高了模具加工质量,取得了良好的经济效益。     

轮胎模具侧板装饰线CAM研究与应用

轮胎模具侧板装饰线作为一种空间曲线具有数量多、加工难度大、一致性要求高等特点,传统的滚花工艺存在一定的缺陷。本文从生产效率、对设备的要求、适用的装饰线类型、铣削过程的能量转化等方面,对应用UG软件生成四轴数控刻字机加工装饰线刀轨文件的两种加工类型进行了比较分析,并对程序的应用进行了优化。     

轮胎模具精密加工智能数字化车间设计与构成

轮胎模具是汽车轮胎生产线上的硫化成型装备,轮胎的花纹、图案、字体以及其他外观特征的成型都依赖于轮胎模具。轮胎模具是极具个性化、高技术含量、高精密和高附加值的产品,其特殊的花纹造型、结构特点和加工工艺都具有很大的技术难度。     

轮胎模具精密加工智能数字化车间设计与构成

轮胎模具是汽车轮胎生产线上的硫化成型装备,轮胎的花纹、图案、字体以及其他外观特征的成型都依赖于轮胎模具。轮胎模具是极具个性化、高技术含量、高精密和高附加值的产品,其特殊的花纹造型、结构特点和加工工艺都具有很大的技术难度。     

精铸铝模常见问题对PCR轮胎质量的影响及解决措施

模具在使用维护中常产生商标标识不匹配、精铸铝花纹块表面状况差、钢圈与侧板配合不好、排气不畅、花纹块分型处钢片弯曲与脱落等问题,致使半钢轮胎产生外观字体不美观、表面粗糙、胶边、圆角、缺胶等外观缺陷,严重影响了半钢轮胎的外观质量。现就精铸铝模常见问题对PCR轮胎质量的影响及     

轮胎模具侧板和轮胎模具

正申请公布号:CN 110978343A申请公布日:2020年4月10日申请人:山东豪迈机械科技股份有限公司发明人:夏世涛、张恭运、孙日文等本发明介绍了一种轮胎模具侧板和轮胎模具。该轮胎模具侧板包括侧板本体和电磁顶出机构,侧板本体设有用于嵌入活字块的嵌槽,嵌槽的底部设有安装槽,电磁顶出机构容纳于安装槽;电磁顶出机构包括第一磁铁和第二磁铁,沿     

浅谈UG软件中变轴加工的设置

随着汽车工业的飞速发展,轮胎企业也相继调整产品结构,轮胎的花纹结构日趋复杂,导致轮胎模具的加工相对较难。采用五轴五联动数控加工中心来加工各种复杂的轮胎花纹模具,一般采用变轴加工方式。下面以一实际工件的数控编程为例,详细说明使命UG软件进行变轴加工编程时,每个参数的设置、需要注意的事项和最后生成刀具轨迹文件的过程。     

基于UG的轮胎模具CAD/CAM技术应用

模具CAD／CAM技术是先进制造技术的基础和重要组成部分，本文以高端的CAD／CAM集成系统UG软件作为支撑环境，根据客户提供的轮胎设计的二维图样，实现了轮胎模具基模胎面及花纹的精确三维造型和数控加工程序编制。阐述了UG环境下的轮胎模具三维造型方法、数控程序编制的工艺流程及制定用户化加工模板的重要性。     

Statistical analysis of bacterial spore aerosols created by opening a spore containing “anthrax letter” in an office

This report provides a statistical analysis of a Bacillus atrophaeus spore aerosol generated by opening a spore containing letter in an office, simulating the effects of an “anthrax letter”. Spore aerosols were collected by five sets of high-resolution slit to agar samplers in a vacated office building (338.4 m², 1015.2 m³) during 34 replicates of a single control scenario. Results showed that 0.1 g of B. atrophaeus spores loaded in a letter were easily detected throughout the building following the opening of the letter. Areas under the curve (AUCs) were used to summarize each replicate scenario, and the variability of the AUCs was examined to assess the sample size requirements for future scenario analyses. Based on this analysis a minimum of five replicates of each scenario will be required for future statistical comparison of new scenarios intended to determine the effectiveness of existing or proposed anthrax letter response protocols.     

Bioaerosol Contamination of Ambient Air as the Result of Opening Envelopes Containing Microbial Materials

Mailing envelopes containing pathogenic spores of bacillus anthraxes, which have recently been used by terrorists to infect humans, calls for a new investigation to identify a level of possible contamination of ambient air as a result of the opening of such envelopes. Here we show that opening an envelope and unfolding a letter aerosolize microbial particles located inside and create their cloud with the diameter equivalent to the length of the letter side along which it was folded. With no motion of an envelope recipient (first case study presented in this paper), the front of the cloud moves due to forced convection caused by the impulse at opening and reaches a human face (approximately 50 cm from the opening zone) in about 6 sec. The concentration of particles at that distance is about three times lower compared to the concentration in the source. Further spread of the cloud brings its front to the distances of 1 and 1.5 meters within 25 and 55 seconds with the corresponding concentrations of around 10% and 5% compared to the source respectively. The second case study presents the results for a more realistic scenario when an envelope recipient, after observing a dust cloud appearing as the result of the opening of the envelope, recoils in fright creating additional air flows significantly disturbing the aerosol propagation described in the former study. It was found theoretically and verified by experiments that the amount of particles captured by the letter recipient varies significantly depending on the geometrical characteristics of the human, distance to the opening zone, reaction time, and recoil velocity.     

一个农村油漆工的呼声

本刊收到一位在农村从事油漆施工20多年的读者来信,反映目前农村涂料产品及施工应用的现状,提出了存在的问题,农村是个广阔的潜在市场,希望今后有更多更好、价廉物美的涂料产品走向农村,满足农村用户的需求。     

Genehmigungsverfahren nach dem Bundes-Immissionsschutzgesetz Bedeutung,Ablauf und Probleme

Permission Procedure According to Federal Law Concerning Immission Protection - Significance, Procedure and Problems According to the federal law concerning immission protection and the subsequent legal regulations, procedures have been fixed in the entire Federal Republic of Germany that regulate the grant of permission starting from application till the official letter of permission. For the administrations of the individual federal states, additional regulations have been laid down. All these regulations constitute the framework of the permission procedure. The content and the extent of the application for permission are of great significance for a manufacturing plant, because in the case of difficulties with supervisory bodies and for the subsequent application and their assessment, the original documents are taken into account. The content of the letter of permission must be critically evaluated, in order to avoid conditions that can not be fulfilled.     

炼油化工建设项目法人责任制要点分析

介绍了项目法人及项目法人责任制的内涵,结合炼油化工建设项目的特点以中国石油化工集团公司为例,提出按照出资人情况可将炼油化工建设项目法人分为四种类型,分析了项目法人（代表）责任书的作用及应包括的主要内容,并对项目法人责任制实施中的关注点及相关问题提出了建议,以期为其他行业大型国有企业集团实施项目法人责任制提供参考。     

A Letter to Editor: On the use of the term “self-polishing” for antifouling paints

This letter presents a confusion on the use of the term “self-polishing” which is widely used in the antifouling paint industry and in published literature.     

Estimating aerosol hazards from an anthrax letter

Events following the anthrax letter incidences in 2001 changed many previously held assumptions regarding biological aerosol hazards. As there were significant fatalities resulting from the sorting of a single anthrax letter, it suggests there is a need to reevaluate how best to measure biological aerosols and to use the information to make accurate predictions. This paper describes the biological aerosol created from manipulating envelopes containing Bacillus subtilis globigii spores (a simulant for anthrax). In addition, the measurements on dispersion of spores from an envelope processed by a mail sorter provide important dynamic aerosol characteristics, information previously unavailable for health risk assessment. The findings produced a number of significant aerosol dosage estimates related to spore contaminated letters. Graphic presentations show significant hazard in handling anthrax-laced letters. Aerosol particle dynamics are described and specific lethal dosage values are listed for a range of activities; these will be useful in assisting the modeling community to create more realistic predictions in hazard assessment studies.     

Letter to the editor—Appearance characterization alternate definitions

This letter to the editor discusses the differences between psychophysical properties of materials and objects and perceptual properties and the terminology used. © 2007 Wiley Periodicals, Inc. Col Res Appl, 32, 235–236, 2007     

感光科学与光化学

本刊主要刊登感光科学和光化学领域的研究成果，同时刊登有关信息科学及信息材料，包括信息储存和记录、信息的处理和加工及信息显示材料等；光／电化学及光电子技术，包括光／电转换及储存材料、电光材料、非线性光学材料、纳米材料、电致发光材料及器件研究以及化学和物理发光等领域；光生物，光医学及生命科学与环境科学中的有关问题的新理论、新概念、新技术和新方法，以促进国内外的学术交流．     

汽液固三相自然循环沸腾流系统固含率CCD测量及研究

应用开发的电荷耦合器件测试系统(Charge coupled device,CCD).研究了汽液固三相自然循环沸腾流系统中固含率沿轴向的变化规律,结果表明沿轴向方向,在加热管内,固含率具有一定波动行为,呈现"S"型分布;加热管内的固含率值较循环管内的值大;随着热通量的增加,加热管内固含率逐渐减小,而循环管内固含率逐渐增加.这些局部行为研究对于揭示该系统的流动、传热和防垢机理,指导工业实践具有应用价值.