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由公式(3-13)可知，系統(tǒng)進給速度與驅(qū)動電機的轉(zhuǎn)速、絲杠導(dǎo)程成正比例關(guān)系。 進給加速度與驅(qū)動電機的轉(zhuǎn)動力矩成正比例關(guān)系，與系統(tǒng)的導(dǎo)程和質(zhì)量成反比例關(guān)系。<br /> 綜上所述，精密復(fù)合式鏜銑加工中心進給傳動系統(tǒng)滾珠絲杠的安裝方式均為 兩端固定。機床在加工過程中，進給系統(tǒng)一直處于工作狀態(tài)，因此滾珠絲杠的溫 度要高于機床本體的溫度，由于絲杠熱變形會引起加工過程中的定位精度降低， 所以要對絲杠進行預(yù)拉伸，保證了傳動的定位精度，進給傳動結(jié)構(gòu)示意圖如圖3.7 所示</p> <p>3.2.2進給系統(tǒng)的電機選擇和計算<br /> 在機床的進給系統(tǒng)設(shè)計中，驅(qū)動電機的選型依然是一個關(guān)鍵點，它是進給系 統(tǒng)性能的重要保障，進給的伺服系統(tǒng)應(yīng)該具備的要求有：高精度的位移反饋、快 的響應(yīng)速度、高的穩(wěn)定性、較寬的調(diào)速范圍和大的扭矩輸出[42]。復(fù)合式鏜銑加工 中心采用伺服驅(qū)動電機，伺服電機應(yīng)根據(jù)以下三條原則選取：<br /> 1、進給系統(tǒng)正常工作時，最大負載轉(zhuǎn)矩必須小于驅(qū)動電機的額定轉(zhuǎn)矩，分析 計算如下：<br /> 機床的加工負載及傳動損失折算到驅(qū)動電機軸上的最大負載轉(zhuǎn)矩M為：<br /> 2、驅(qū)動電機的轉(zhuǎn)子慣量應(yīng)與負載慣量相匹配，下面分別進行計算，具體步驟 如下：<br /> 驅(qū)動電機的轉(zhuǎn)子慣量JM必須與負載慣量九相匹配，一般/M應(yīng)該大于九，然 而卻不能太大，因為JM越大，系統(tǒng)的總慣量就越大，通常的匹配條件為：<br /> 3、進給系統(tǒng)在做快速移動時，瞬時轉(zhuǎn)矩不得大于驅(qū)動電機的最大輸出扭矩， 分析計算如下。a移動部件從靜止以階躍指令加速到最大移動速度時，所需要提 供的動力轉(zhuǎn)矩最大，計算公式為：<br /> 加速時間由機床的加速度指標確定，按照機床的實際使用慣例，我們把運動 部件從靜止啟動至最大快移速度時產(chǎn)生的加速度規(guī)定為機床的最大加速度：<br /> 精密復(fù)合式鏜銑加工中心進給系統(tǒng)驅(qū)動電機按照以上三條原則選取，首先根 據(jù)第一條原則選出驅(qū)動電機的型號，然后再逆向的比較驅(qū)動電機的轉(zhuǎn)子慣量應(yīng)與 負載慣量是否相匹配，最后再來計算電機能否提供機床的最大加速度，最終達到 精密復(fù)合式鏜銑加工中心的設(shè)計要求。</p></div> <div id="n1l1njb9b" class="blank30"></div> <!-- tag --> <div id="n1l1njb9b" class="blank10"></div> 標簽： <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <!-- 分類 --> <div id="n1l1njb9b" class="blank10"></div> 分類： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div id="n1l1njb9b" class="blank30"></div> <!--自動調(diào)用自定義字段--> <div id="n1l1njb9b" class="blank20"></div> <div id="n1l1njb9b" class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=1428"></script> <!-- 自定義表單開始 --> <!-- 自定義表單結(jié)束 --> <div id="n1l1njb9b" class="blank60"></div> <!-- 上下頁開始 --> <div class="n1l1njb9b" id="page"> <strong>上一篇</strong><a 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