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“Miller Weldmaster公司的标准机器常被用于制作防水油布,建筑类产品(如柔韧的管道)、广告牌和和服装,”Miller Weldmaster公司总工Brain Henry说,“这种类型的机器配用专有的硬连线控制系统,该系统要求操纵职员频繁地做机械调整,以设定切割长度和接头。这些机械设置工作在每次产品开始行进时重复。”
为了保持它的市场状态,公司熟悉到需要发现一更有效和正确的方式。Henry以为:“那个目标是一种能够通过减少设置时间而增强生产能力的控制系统 — 这种系统还要提供更高的尺寸精度和在成品中的可重复性,减少操纵者负担和错误机率,并能提供远程诊断能力,保持一种简单的、使用本地的元器件现货的控制结构。”另外,标准精确度需要进步。公司意识到增值服务性能所带来的潜伏利润,以及由于答应Miller Weldmaster公司工程师们远程维护和安装机器而随之减少的差旅费。
“另一个发展需要是通过极少的人工设置来减少职员培训本钱,而用于提供做尺寸参数的人机界面对操纵者来说,直接、可视。”海瑞补充说。
经过一些调查后,Miller Weldmaster公司发现施耐德电气(Schneider Electric)公司的运动控制解决方案可以满足上述的大多数需求。这种解决方案采用TSX MP PLC和一个轴控制模块。“新机器装备有一个10英寸彩色触摸屏显示器,让操纵者能看到机器状态和警报,能输进产品尺寸信息作为每部分的处方存储起来。”
PLC配有可互联的以太网模块,提供局部诊断和编程,提供全面制造结构的集成。Miller Weldmaster公司的服务职员把PLC的AUX端口连接到一个标准的普通电话调制解调器(MODEM),作为远程接进。
据Henry说,新的运动控制系统超出了Miller Weldmaster公司的期看,尺寸精度从+/-0.375英寸进步到优于+/-0.062英寸,由于这个系统是方案设定驱动式的,每个产品的配置被存储在内存,为下一次运行做预备。所以,每次一个特殊产品运转时,这个精确性就被重复一次。
由以太网使能PLC来控制机器之后,通过MODEM进行远程诊断如今成为可能。并且操纵者的培训用度也通过操纵者界面的简化而明显减少了。以前的配置时间约20~30分钟,现在,配置时间大约30秒,大大地进步了产品的速度。
Ttarp Industries公司 (www.ttarp.com)设计和制造硬模切割机、层合机、锯和分离机,广泛用于制作泡沫、塑料、橡胶、粘合剂和其它材料应用(图3)。
Ttarp公司的客户通常是小规模装配商,维护和技术支持都是有限的。因此,他们购买的机器必须轻易操纵和维护。“我们的客户没有时间、人力和我们的技术职员通电话,所以我们必须使我们的机器非常轻易使用和可靠,”Ttarp公司的电气工程师兼服务技术员Chet Pulaski解释说。并且,像所有的产业化OEM厂商一样,Ttarp公司不得不优化运行并使本钱下降。
Ttarp公司的所有者Don Pratt以为实现新自动化的理由是:把轻易使用和高可靠性加进公司的装配机器中。所以多年以来,Ttarp公司通过稳步增加自动化水平,以使其装配设备与时俱进。例如,它的原始的离合器皮带运动系统10年前被一个Whedco步进控制系统代替。
Pulaski对易于使用和编程的驱动器感到兴奋,但他最近决定升级单个的、可执行机器和运动控制功能的设备。“我们不仅要考虑更轻易安装和维护,我们也需要一个更强有力的装置,以提供甚至更大的精确度、可靠性和速度,” Pulaski说。在Ttarp公司的Steel Rule Die Cutting Press和Automatic Vertical Saw上,他安装了一个GE Fanuc S2K的基于旋转变压器的伺服系统。
Ttarp公司的客户对这个改变很兴奋,据Pulaski说,根据地方报告可知,服务呼唤和培训时间节省下来。
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