钻削、扩削、铰削加工中毛坯扩孔群钻切削部分几何参数
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<DIV align=center><IMG height=475 src="http://www.chmcw.com/upload/news/RCL/13220_stsfha0802231031276466.gif" width=400 border=0><BR>特点口诀<BR>毛坯扩孔定心难，钻心低于两外尖，外刃切入手进给，再用机进也不偏。</DIV></TD></TR>
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<DIV align=center>钻头直径d</DIV></TD>
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<DIV align=center>尖 高h</DIV></TD>
<TD width="6%">
<DIV align=center>圆弧半径R</DIV></TD>
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<DIV align=center>横刃长b</DIV></TD>
<TD width="6%">
<DIV align=center>外刃长l</DIV></TD>
<TD width="6%">
<DIV align=center>外刃锋角2k<SUB>r</SUB></DIV></TD>
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<DIV align=center>内刃锋角2k′<SUB>r</SUB></DIV></TD>
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<DIV align=center>横刃斜角ф</DIV></TD>
<TD width="10%">
<DIV align=center>内刃前角γ<SUB>or</SUB></DIV></TD>
<TD width="7%">
<DIV align=center>内刃斜角τ</DIV></TD>
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<DIV align=center>外刃后角α<SUB>o</SUB>f<SUB>1</SUB></DIV></TD>
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<DIV align=center>圆弧后角α<SUB>o</SUB>f<SUB>2</SUB></DIV></TD></TR>
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<DIV align=center>mm</DIV></TD>
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<DIV align=center>（°）</DIV></TD></TR>
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<DIV>30～46</DIV></TD>
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<DIV>1.5</DIV></TD>
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<DIV>6</DIV></TD>
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<DIV>1.5</DIV></TD>
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<DIV>按扩孔余量决定</DIV></TD>
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<DIV>120</DIV></TD>
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<DIV>140</DIV></TD>
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<DIV>65</DIV></TD>
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<DIV>-15</DIV></TD>
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<DIV>30</DIV></TD>
<TD>
<DIV>12</DIV></TD>
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<DIV>12</DIV></TD></TR>
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<DIV>>45～60</DIV></TD>
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<DIV>2</DIV></TD>
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<DIV>7</DIV></TD>
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<DIV>2</DIV></TD>
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<DIV>按扩孔余量决定</DIV></TD>
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<DIV>120</DIV></TD>
<TD>
<DIV>140</DIV></TD>
<TD>
<DIV>65</DIV></TD>
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<DIV>-15</DIV></TD>
<TD>
<DIV>35</DIV></TD>
<TD>
<DIV>10</DIV></TD>
<TD>
<DIV>10</DIV></TD></TR>
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<TD>
<DIV>>60～80</DIV></TD>
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<DIV>2.5</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>2.5</DIV></TD>
<TD>
<DIV>按扩孔余量决定</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>140</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>-15</DIV></TD>
<TD>
<DIV>40</DIV></TD>
<TD>
<DIV>8</DIV></TD>
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<DIV>8</DIV></TD></TR></TBODY></TABLE></DIV>
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<DIV align=center>备 注</DIV></TD>
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<DIV align=center>参数值直径范围的中间值来定，允许偏差为 ± </DIV></TD></TR></TBODY></TABLE></DIV>
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