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        數控車床的變頻調速應用
        來源: | 作者:xldzkj | 發布時間: 2018-10-30 | 1346 次瀏覽 | 分享到:

          隨著電子技術、計算機技術、自動控制與自動檢測等技術的高速發展,反映到控制系統中來,它既能幫助車床自動化,又能提高加工準確度,因而就發展成為數控系統。

          一、拖動系統的特點

          金屬切削車床的基本運動是切削運動,即工件與刀具之間的相對運動,切削運動由主運動和進給運動組成。在切削運動中,承受主要切削功率的運動稱為主運動。在車床中,主運動是工件運動。

          金屬切削車床的主運動都要求調速,并且調速的范圍往往較大。金屬切削車床主運動的調速。一般都在停機的情況下進行,在切削過程中是不進行調速的

          二、主運動的負載性質

          通用車床的低段速,允許的最大進刀量都是相同的,負載轉矩也相同,屬于恒轉矩區;而在高速段,由于受床身機械強度和振動以及刀具強度等的影響,速度越高,允許的最大進刀量越小,負載轉矩也越小,但切削功率保持相同,屬于恒功率區。恒轉矩區和恒功率區的分界轉數稱為計算轉數,用nD表示。計算轉速大小的規定大致如下:一般規定,從最低速起,以全部級數的1/3的最高速作為計算轉速。隨著刀具強度和切削技術的提高,計算速度已大為提高,通常的規定是:以最高轉速的(1/4~1/2)作為計算轉速:nD≈n max/(2~4)

          三、車床的大致構造與拖動

          1.以車床的主要部件有:①頭架:用于固定工件,內藏齒輪箱,是主要的傳動機之一。②尾架:用于頂住工件,是固定工件用的輔助部件。③刀架,用于固定車刀。④床身,用于安置所有部件。

          2.拖動系統:主要包括以下兩種運動:

         ?、僦鬟\動:工件的旋轉運動為主運動,帶動工件旋轉的拖動系統。

         ?、谶M給系統:主要是刀架的移動。

          3.主運動系統阻轉矩的形成:主運動系統的阻轉矩就是工件在切削過程中形成的阻轉矩,切削功率用于切削的剝落和變形,故切削力正比于被切削的材料性質和截面積,切削面積由切削深度和走刀量決定,而切削轉矩則取決于切削力和工件回轉半徑的乘積,其大小與下列因素有關:

         ?、偾邢魃疃?,

         ?、谶M刀量,

         ?、酃ぜ牟馁|與直徑等。
          數控車床的變頻調速應用.doc

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