Tuesday, September 21, 2010

齿轮滚刀安装角的调整方法计算口诀

在Y3150E型滚齿机上加工斜齿圆柱齿轮时,为了切出准确的齿形,应使滚刀和工件处于正确的"啮合"位置,即保证滚刀刀齿的排列方向与齿轮齿槽 方向一致,从而加工出一定螺旋角的齿轮齿槽。为此,在加工齿轮前须将滚刀轴线相对于齿轮顶面偏转一定的角度进行安装,该偏转角称为滚刀安装角,用 δ表示。滚刀安装角δ的大小和方向不仅与滚刀螺旋升角ω大小和方向有关,还与被加工齿轮的螺旋角β的大小和方向有关,这就给滚刀的实际调整安装带 来了不便。本人总结出"八字口诀",来帮助滚刀的调整安装。   

滚切斜齿圆柱齿轮时滚刀轴线偏转情况,其安装角大小为:δ=β±ω(β>ω)   

滚切斜齿圆柱齿轮时滚刀的安装角  
   当滚刀的螺旋升角ω的旋向与齿轮螺旋角β的旋向相同时,滚刀安装角δ的大小为β-ω;当滚刀的螺旋升角ω的旋向与齿轮螺旋角β的旋向不同 时,滚刀安装角δ的大小为β+ω。滚刀安装角δ的偏转方向与被加工齿轮的旋向有关,当加工右旋齿轮时,滚刀逆时针偏转;当加工左旋齿轮时,滚刀顺 时针偏转。根据以上分析,可总结出如下口诀:"同减异加,右逆左顺。"   

   同减异加:是指当滚刀的螺旋升角ω的旋向与齿轮的螺旋角β的旋向相同时,滚刀安装角计算公式取"-"号;当滚刀的螺旋升角ω的旋向与齿轮的 螺旋角β的旋向不同时,滚刀安装角计算公式取"+"号。   

   右逆左顺:是指当加工右旋齿轮时,滚刀逆时针偏转安装角δ;加工左旋齿轮时,滚刀顺时针偏转安装角δ。   

   例如:用ω=2°的左旋滚刀加工β=20°的左旋齿轮时,则对照口诀用"同减"和"左顺"来确定。即:滚刀的安装角大小为δ=β- ω=20°-2°=18°,方向为顺时针偏转。   

   又如:用ω=2°的左旋滚刀加工β=20°的右旋齿轮时,则对照口诀用:"异加"和"右逆"来计算和偏转。即:滚刀的安装角大小为 δ=β+ω=20°+2°=22°,方向为逆时针偏转。   

加工直齿轮时,因β=0°,则滚刀安装角δ为:   

δ=±ω   

   其偏转方向决定于滚刀的螺旋升角ω的旋向,即左旋时逆时针偏转ω,右旋时顺时针偏转ω,此时不必用以上口诀。

Saturday, September 18, 2010

[免费]化工及矿产国际买家 海外进口商资料

免费海外买家资料——化工及矿产国际买家

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