钻削、扩削、铰削加工中黄铜群钻切削部分几何参数
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<DIV align=center><IMG height=480 src="http://www.chmcw.com/upload/news/RCL/13220_yx4kjw080225845095490.gif" width=400 border=0><BR>特点口诀<BR>黄铜钻孔易“扎刀”，外刃前角要减小，棱边磨窄、修圆弧、孔圆、光整质量高。</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>
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<DIV align=center>圆弧半径R</DIV></TD>
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<DIV align=center>横刃长b</DIV></TD>
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<DIV align=center>外刃长l</DIV></TD>
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<DIV align=center>修磨长度f</DIV></TD>
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<DIV align=center>外刃锋角</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>
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<DIV align=center>外刃纵向前角γ<SUB>or</SUB></DIV></TD>
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<DIV align=center>内刃前角γ<SUB>or</SUB></DIV></TD>
<TD width=46 rowSpan=3>
<DIV align=center>内刃前角γ<SUB>or</SUB></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>Ⅰ</DIV></TD>
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<DIV align=center>Ⅱ</DIV></TD></TR>
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<DIV align=center>2k<SUB>r</SUB></DIV></TD></TR>
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<DIV align=center>mm</DIV></TD>
<TD width=444 colSpan=9>
<DIV align=center>（°）</DIV></TD></TR>
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<DIV>5～7</DIV></TD>
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<DIV>0.2</DIV></TD>
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<DIV>0.75</DIV></TD>
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<DIV>0.15</DIV></TD>
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<DIV>1.3</DIV></TD>
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<DIV>1.5</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>20</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>18</DIV></TD></TR>
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<TD>
<DIV>>7～10</DIV></TD>
<TD>
<DIV>0.3</DIV></TD>
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<DIV>1</DIV></TD>
<TD>
<DIV>0.2</DIV></TD>
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<DIV>1.9</DIV></TD>
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<DIV>1.5</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>20</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>18</DIV></TD></TR>
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<DIV>>10～15</DIV></TD>
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<DIV>0.4</DIV></TD>
<TD>
<DIV>1.5</DIV></TD>
<TD>
<DIV>0.3</DIV></TD>
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<DIV>2.6</DIV></TD>
<TD>
<DIV>1.5</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>20</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>18</DIV></TD></TR>
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<TD>
<DIV>>15～20</DIV></TD>
<TD>
<DIV>0.55</DIV></TD>
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<DIV>2</DIV></TD>
<TD>
<DIV>0.4</DIV></TD>
<TD>
<DIV>3.8</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>25</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>15</DIV></TD></TR>
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<DIV>>20～25</DIV></TD>
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<DIV>0.70</DIV></TD>
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<DIV>2.5</DIV></TD>
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<DIV>0.48</DIV></TD>
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<DIV>4.9</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>25</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>15</DIV></TD></TR>
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<DIV>>25～30</DIV></TD>
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<DIV>0.85</DIV></TD>
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<DIV>3</DIV></TD>
<TD>
<DIV>0.55</DIV></TD>
<TD>
<DIV>6</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>25</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>15</DIV></TD></TR>
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<TD>
<DIV>>30～35</DIV></TD>
<TD>
<DIV>1</DIV></TD>
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<DIV>3.5</DIV></TD>
<TD>
<DIV>0.65</DIV></TD>
<TD>
<DIV>7.1</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>25</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>15</DIV></TD></TR>
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<DIV>>35～40</DIV></TD>
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<DIV>1.15</DIV></TD>
<TD>
<DIV>4</DIV></TD>
<TD>
<DIV>0.75</DIV></TD>
<TD>
<DIV>8.2</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>125</DIV></TD>
<TD>
<DIV>110</DIV></TD>
<TD>
<DIV>135</DIV></TD>
<TD>
<DIV>65</DIV></TD>
<TD>
<DIV>8</DIV></TD>
<TD>
<DIV>-10</DIV></TD>
<TD>
<DIV>25</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>15</DIV></TD></TR></TBODY></TABLE></DIV>
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<DIV>备注</DIV></TD>
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<DIV>1）Ⅰ－钻黄铜；Ⅱ－钻胶木<BR>2）参数值按直径范围的中间值来定，允许偏差为 ± <BR>3）钻胶木时不必修磨前面<BR>4）γ<SUB>or</SUB>指外外缘点纵向修磨前角，便于观察控制</DIV></TD>
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<DIV>近似比例</DIV></TD>
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<DIV>h≈0.03d<BR>R≈0.1d<BR>b≈0.02d<BR>l≈0.2d</DIV></TD></TR></TBODY></TABLE></DIV>
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