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“Miller Weldmaster公司的標準機器常被用于制作防水油布,建筑類產品(如柔韌的管道)、廣告牌和和服裝,”Miller Weldmaster公司總工Brain Henry說,“這種類型的機器配用專有的硬連線控制系統,該系統要求操縱職員頻繁地做機械調整,以設定切割長度和接頭。這些機械設置工作在每次產品開始行進時重復。”
為了保持它的市場狀態,公司熟悉到需要發現一更有效和正確的方式。Henry以為:“那個目標是一種能夠通過減少設置時間而增強生產能力的控制系統 — 這種系統還要提供更高的尺寸精度和在成品中的可重復性,減少操縱者負擔和錯誤機率,并能提供遠程診斷能力,保持一種簡單的、使用本地的元器件現貨的控制結構。”另外,標準精確度需要進步。公司意識到增值服務性能所帶來的潛伏利潤,以及由于答應Miller Weldmaster公司工程師們遠程維護和安裝機器而隨之減少的差旅費。
“另一個發展需要是通過極少的人工設置來減少職員培訓本錢,而用于提供做尺寸參數的人機界面對操縱者來說,直接、可視。”海瑞補充說。
經過一些調查后,Miller Weldmaster公司發現施耐德電氣(Schneider Electric)公司的運動控制解決方案可以滿足上述的大多數需求。這種解決方案采用TSX MP PLC和一個軸控制模塊。“新機器裝備有一個10英寸彩色觸摸屏顯示器,讓操縱者能看到機器狀態和警報,能輸進產品尺寸信息作為每部分的處方存儲起來。”
PLC配有可互聯的以太網模塊,提供局部診斷和編程,提供全面制造結構的集成。Miller Weldmaster公司的服務職員把PLC的AUX端口連接到一個標準的普通電話調制解調器(MODEM),作為遠程接進。
據Henry說,新的運動控制系統超出了Miller Weldmaster公司的期看,尺寸精度從+/-0.375英寸進步到優于+/-0.062英寸,由于這個系統是方案設定驅動式的,每個產品的配置被存儲在內存,為下一次運行做預備。所以,每次一個特殊產品運轉時,這個精確性就被重復一次。
由以太網使能PLC來控制機器之后,通過MODEM進行遠程診斷如今成為可能。并且操縱者的培訓用度也通過操縱者界面的簡化而明顯減少了。以前的配置時間約20~30分鐘,現在,配置時間大約30秒,大大地進步了產品的速度。
Ttarp Industries公司 (www.ttarp.com)設計和制造硬模切割機、層合機、鋸和分離機,廣泛用于制作泡沫、塑料、橡膠、粘合劑和其它材料應用(圖3)。
Ttarp公司的客戶通常是小規模裝配商,維護和技術支持都是有限的。因此,他們購買的機器必須輕易操縱和維護。“我們的客戶沒有時間、人力和我們的技術職員通電話,所以我們必須使我們的機器非常輕易使用和可靠,”Ttarp公司的電氣工程師兼服務技術員Chet Pulaski解釋說。并且,像所有的產業化OEM廠商一樣,Ttarp公司不得不優化運行并使本錢下降。
Ttarp公司的所有者Don Pratt以為實現新自動化的理由是:把輕易使用和高可靠性加進公司的裝配機器中。所以多年以來,Ttarp公司通過穩步增加自動化水平,以使其裝配設備與時俱進。例如,它的原始的離合器皮帶運動系統10年前被一個Whedco步進控制系統代替。
Pulaski對易于使用和編程的驅動器感到興奮,但他最近決定升級單個的、可執行機器和運動控制功能的設備。“我們不僅要考慮更輕易安裝和維護,我們也需要一個更強有力的裝置,以提供甚至更大的精確度、可靠性和速度,” Pulaski說。在Ttarp公司的Steel Rule Die Cutting Press和Automatic Vertical Saw上,他安裝了一個GE Fanuc S2K的基于旋轉變壓器的伺服系統。
Ttarp公司的客戶對這個改變很興奮,據Pulaski說,根據地方報告可知,服務呼喚和培訓時間節省下來。
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