科创中国

针对加工中心的多种ATC换刀方式,归纳总结了ATC换刀的特点,分析了ATC换刀的条件.依据换刀的特点和换刀条件,通过编写合适的换刀程序,使换刀程序得以优化和简化,为编程提供了方便.

目前,国内钢筋加工配送中心多为重硬件而轻软件,国内几个钢筋加工设备生产厂家生产的设备已基本能满足钢筋商品化配送的要求,但是在信息化管理方面差距还很大,制约了钢筋加工配送行业的发展.本文介绍一种自主研发的钢筋加工配送管理系统.

As the popularization of dual ring fieldbus,the optimized dual ring synchronization methods are still in short.The current synchronization methods are generally established in traditional industrial fieldbus,in which transmission is commonly considered in single track,the two-way transmitting cannot take full effect,and would result in unwanted idle load on equipment lines.In stamp-transferring part,the synchronizing algorithm is not properly processed to diminish the latency,so the real-time performance of entire system cannot be ensured.To support the synchronization control of stations in the CNC system,a real-time time synchronization method for dual ring fieldbus in the CNC system is designed in this paper.In this method a synchronizing message transmission scheme based on dual ring architecture and the synchronization algorithm between master and secondary stations are integrated.In the scheme,the clock models of both master and secondary stations are optimized with corresponding modules and the stamp data transmission based on the dual ring fieldbus is devised exclusively,so the transmitting efficiency improves with less idle work.In the algorithm,all the secondary stations can accomplish the consistent state with master station by updating clock discrepancy information in one communication cycle,and it takes the advantage of two-way transmitting and makes the best use of dual ring structure,so the real-time performance of the system can be promoted while retaining the precision of synchronization.To evaluate the performance,the costs of the method and errors during synchronizing are noted and analyzed based on the actual running environment in the industrial fieldbus.The results show that it reduces communication cost and ensures the smoothness of the system with low lag effects under heavy load.The proposed time synchronization method optimizes the architecture of sync message transmission in dual ring fieldbus,and improves the efficiency of time synchronization in the stations of CNC system.

为验证"黄山(精品)"制丝线造纸法再造烟叶加工处理工艺流程设计,从工艺流程、温度及含水率稳定性、掺配及加料均匀性、理化指标和感官质量5个方面对同步加工与预加工进行了比较.结果表明:①同步加工具有工艺流程简洁、操作简便、投资小、生产组织时间短等优点,不足之处在于含水率稳定性、掺配及加料均匀性较差,而预加工相反;②与同步加工相比,经预加工处理后,卷烟物理指标、烟丝常规化学成分及感官质量无明显变化,批内卷烟烟气焦油、烟碱、一氧化碳释放量稳定性有所提升.

轴上、端面上的对称键槽加工方法通常是:用分度头装夹铣完零件上的第一个键槽后,根据槽数的不同,分度一个角度夹紧,再铣第二个键槽.我公司在加工如图1所示的零件时,由于零件长达530mm,受设备的限制,在铣床上无法加工,只有在镗床上加工端面键槽,为此我们设计了一个简易的工装进行分度.

采用脚板苕块茎为原料,去皮洗净后蒸煮再磨成酱醪,与辅料混合、装瓶杀菌,制备出色、香、味俱全含有丰富矿物质、氨基酸、维生素并具有补脾养胃、生津益肺、补肾涩精功能的脚板苕酱.脚板苕酱颜色鲜艳,为金黄色,味道鲜美,营养丰富,结果表明,蛋白质含量33.5 mg·g-1,含有17种氨基酸和8种人体必需氨基酸,脂肪含量18.1 mg·g-1,含有丰富矿物质和维生素.

第22届国际金属板材加工技术展览会(EuroBLECH2012)将于10月23至27日在德国汉诺威隆重举行.届时将为观众呈现行业最前沿的技术动态及最新经济形势.

压握过程中支架发生塑性变形及加工硬化现象将对支架的后续变形行为产生影响.研究利用有限元方法模拟了支架的完整变形过程,评价了扩张后支架的各项性能,并与未考虑压握过程的模拟结果进行了比较.结果表明,压握过程不仅会导致扩张后支架的形状发生变化,同时会使回弹率和最大应力增大,支架最大可扩张直径变小.

目的:分析并评价北京市一级一类幼儿园学龄前儿童食堂儿童餐食加工过程.方法:通过整群随机抽样的方法选取北京市3所一级一类幼儿园共计1 199名儿童,用观察法对各幼儿园餐食加工过程进行跟踪调查,并采用我国卫生系统专用的卫生质量评价表格对其卫生质量进行评价,用连续5d的称量记帐法评价其膳食营养质量.结果:幼儿园食堂餐食加工卫生质量良好,儿童锌、视黄醇当量的摄入不足,能量和其余营养素摄取均达到了参考摄入的标准.结论:北京市一级一类幼儿园食堂加工过程基本合理,卫生质量保障全面到位,但是在营养质量保障方面有部分不足,应当进一步加强对幼儿园食堂的研究和指导.

文章主要概述国内外运用视线追踪技术评估网页可用性的研究,分析总结了视线追踪技术用于可用性评估的优势、目前常用的测量指标及其解释、研究设计及其数据分析的方法,最后展望了视线追踪技术在网页可用性评估中广泛应用所面临的挑战和未来研究的方向.