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裝置的軟件特點是什么? 從功能特征來看分為:控制系統(tǒng)和管理系統(tǒng) CNC 裝置的軟件特點是: —— 資源分時共享、并發(fā)處理和流水處理 ; 。 C刀補:是直線過渡,預讀兩條指令進行處理。 31. 進給伺服系統(tǒng)的作用是什么?進給伺服系統(tǒng)的技術要求有哪些 ? 進給伺服系統(tǒng)的作用:進給伺服系統(tǒng)是數(shù)控系統(tǒng)主要的子系統(tǒng)。 進給伺服系統(tǒng) 接受數(shù)控系統(tǒng)發(fā)出的進給位移和速度指令信號,由伺服驅動電路作一定的轉換和放大后,經(jīng)伺服驅動裝置和機械傳動機構,驅動機床的執(zhí)行部件進行工作進給和快速進給。 34. 步進電 機驅動器中,環(huán)行分配器的作用是什么? 控制施加到電機繞組的脈沖電源的相序。 37. 什么是進給伺服系統(tǒng)的調(diào)速范圍 ? 調(diào)速范圍是指最高進給速度與最低進給速度之比。 Z相的作用:被測軸的周向定位基準信號;被測軸的旋轉圈數(shù)計數(shù)信號。 提高定位精度的措施:提高傳動機構的剛度 k、減小傳動間的摩擦力 Fc、增大放大器增益、選力矩系數(shù)大的伺服電機。 42. 數(shù)控回轉工作臺進給系統(tǒng)采用閉環(huán)控制時,位置檢測元件安裝在什么位置? 位置檢測元件安裝在數(shù)控回轉工作臺的轉軸上。 50. 什么是自動換刀裝置 ? 儲備一定數(shù)量的刀具并完成刀具的自動交換功能的裝置。 55. 交換裝置的形式有哪幾種 ? 各有何應用場合和特點 ? 交換裝置的形式:刀庫和主軸相對運動實現(xiàn)刀具交換(結構簡單換刀時間長,換刀動作多);由機械手進行刀具交換(動作簡單,換刀時間短) 5簡要說明數(shù)控機床坐標軸的確定原則。若沒有回轉主軸,則規(guī)定垂直于工件裝夾表面的坐標軸為 Z 軸。在工件旋轉的機床(如車床、外圓磨床)上, X軸的運動方向是徑向的,與橫向導軌平行。在確定了 X、 Z軸的正方向后,即可按右手定則定出 Y軸正方向。 ( 3) MDI/CRT 接口 MDI 即手動數(shù)據(jù)輸入單元, CRT 為顯示器。主要是用于接收機械操作面板上的各種開關、按鈕以及機床上各行程限位開關等信號,或將 CNC 裝置發(fā)出的控制信號送到強電柜以及將各工作狀態(tài)指示燈信號送到操作面板 等。 答: 1)、 CNC 即計算機數(shù)控系統(tǒng)( Computerized Numerical Control)的縮寫,它是在硬件數(shù)控( NC)系統(tǒng)的基礎上發(fā)展起來的,由一臺 計算機完成早期NC機床數(shù)控裝置的所有功能,并用存貯器實現(xiàn)了零件加工程序的存貯。 答:插補是在組成軌跡的直線段或曲線段的起點和終點之間,按一定的算法進行數(shù)據(jù)點的密化工作,以確定一些中間點。 6試區(qū)別一下手工編程和自動編程的過程以及適用場合。編程人員只要根據(jù)零件圖紙和工藝要求,用規(guī)定的語言編寫一個源程序或者將圖形信息輸入到計算機中,由計算機自動地進行處理,計算出刀具中心的軌跡,編寫出加工程序清單,并自動制成所需控制介質(zhì)。 6數(shù)控機床常用的程序輸入方法有哪些? 答: 1)、穿孔紙帶; 2)、數(shù)據(jù)磁帶 3)、軟磁盤或聯(lián)機控制 4)、 MDI 手動輸入 6數(shù)控加工機床按加工控制路線應分為哪幾類?其控制過程有何不同? 專業(yè)好文檔 11 答: 1)點位控制機床:只控制刀具從一點向另一點移動,而不管其中間行走軌跡的控制方式。 3)輪廓控制機床:,可控制刀具相對于工件作連續(xù)軌跡的運動,能加工任意斜率的直線,任意大小的圓弧,配以自動編程計算,可加工任意形狀的曲線和曲面。換刀點位置為( X200、 Z350),加工程序見表 83。s celebrations said he wanted to meet Ivory Coast international Toure to discuss his plaint. CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media. Blatter, 77, said: It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them. It is a nonsense to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense. We can do something better to fight racism and discrimination. This is one of the villains we have today in our game. But it is only with harsh sanctions that racism and discrimination can be washed out of football. The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Baumgartner the disappointing news: Mission aborted. The supersonic descent could happen as early as Sunda. The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than 專業(yè)好文檔 14 the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39