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          <h1 class="tit">精密数控车床车刀的选择和安装</h1>
          <span class="time">发布时间:2023-11-24 13:57:29</span> <span class="from">阅读数: 409</span> </div>
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         <p style="text-indent: 2em;"><span style="font-size: 16px;">精密数控车床加工时常用的车刀有：外圆车刀、内孔车刀和螺纹车刀三种。</span><br/></p><p style="line-height: 1.75em; text-indent: 2em;"><span style="font-size: 16px;">精密数控车床螺纹车刀的选择主要考虑刀具、形状和几何角度等三个方面。</span></p><p style="line-height: 1.75em; text-indent: 2em;"><span style="font-size: 16px;">高速钢螺纹车刀，适用于加工大螺距的螺纹和精密螺纹等工件。硬质合金螺纹车刀适用于加工脆性材料(铸铁)和高速切削塑性工件。螺纹车刀的几何角度有三个：一是刀尖角ε应等于牙形角，车削普通三角形螺纹是60°;二是前角γ一般为0°～15°;三是后角α一般为5°～10°，进刀方向一面应稍大一些。</span></p><p style="line-height: 1.75em; text-indent: 2em;"><span style="font-size: 16px;">数控车床车削螺纹时，为了保证牙形正确，对安装数控车床的螺纹车刀提出了严格的要求。安装时刀尖高度必须对准工件旋转中心(可根据尾座顶针高度检查)，车刀刀尖角的中心线必须与工件严格垂直，装刀时可用样板来对刀。如果车刀装歪，就会产生牙形歪斜。另外刀头伸出不能太长，一般为20～25mm(约刀杆厚度的1.5倍)。</span></p><p style="line-height: 1.75em; text-indent: 2em;"><span style="font-size: 16px;">刃磨数控车床车刀时要根据粗、精车的要求，刃磨出合理的前、后角。粗车刀前角大，后角小，精车刀则相反。车刀的左右刀刃必须是直线，无崩刃。刀尖角在刃磨时用螺纹角度样板测量刀尖角。测量时，把刀尖角与样板贴合，对准光源，仔细观察两边贴合的间隙，并以此为依据进行修磨。</span></p><p><br/></p><p><br/></p><p><br/></p>
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