钻削、扩削、铰削加工中紫铜群钻切削部分几何参数
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<DIV align=center>特点口诀<BR>紫铜群钻钻心高，圆周弧后角要减小，横刃斜角九十度，孔形光整无多角。</DIV></TD></TR></TBODY></TABLE></DIV>
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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=38>
<DIV align=center>圆弧半径R</DIV></TD>
<TD width=53>
<DIV align=center>横刃长b</DIV></TD>
<TD width=56>
<DIV align=center>外刃长l</DIV></TD>
<TD width=39>
<DIV align=center>槽距l<SUB>1</SUB></DIV></TD>
<TD width=45>
<DIV align=center>槽宽l<SUB>2</SUB></DIV></TD>
<TD width=41>
<DIV align=center>槽数z</DIV></TD>
<TD width=41>
<DIV align=center>外刃锋角2k<SUB>r</SUB></DIV></TD>
<TD width=46>
<DIV align=center>内刃锋角2k′<SUB>r</SUB></DIV></TD>
<TD width=47>
<DIV align=center>横刃斜角ф</DIV></TD>
<TD width=42>
<DIV align=center>内刃前角γ<SUB>or</SUB></DIV></TD>
<TD width=43>
<DIV align=center>内刃斜角τ</DIV></TD>
<TD width=31>
<DIV align=center>外刃后角α<SUB>o</SUB>f<SUB>1</SUB></DIV></TD>
<TD width=31>
<DIV align=center>圆弧后角α<SUB>o</SUB>f<SUB>2</SUB></DIV></TD></TR>
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<TD width=305 colSpan=7>
<DIV align=center>mm</DIV></TD>
<TD width=41>
<DIV align=center>条</DIV></TD>
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<DIV align=center>（°）</DIV></TD></TR>
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<TD>
<DIV>5～7</DIV></TD>
<TD>
<DIV>0.35</DIV></TD>
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<DIV>1.25</DIV></TD>
<TD>
<DIV>0.15</DIV></TD>
<TD>
<DIV>1.3</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
<TR>
<TD>
<DIV>>7～10</DIV></TD>
<TD>
<DIV>0.5</DIV></TD>
<TD>
<DIV>1.75</DIV></TD>
<TD>
<DIV>0.2</DIV></TD>
<TD>
<DIV>1.9</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
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<TD>
<DIV>>10～15</DIV></TD>
<TD>
<DIV>0.8</DIV></TD>
<TD>
<DIV>2.25</DIV></TD>
<TD>
<DIV>0.3</DIV></TD>
<TD>
<DIV>2.6</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
<TR>
<TD>
<DIV>>15～20</DIV></TD>
<TD>
<DIV>1.1</DIV></TD>
<TD>
<DIV>3</DIV></TD>
<TD>
<DIV>0.4</DIV></TD>
<TD>
<DIV>3.8</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>-</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
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<TD>
<DIV>>20～25</DIV></TD>
<TD>
<DIV>1.4</DIV></TD>
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<DIV>4</DIV></TD>
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<DIV>0.48</DIV></TD>
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<DIV>4.9</DIV></TD>
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<DIV>-</DIV></TD>
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<DIV>-</DIV></TD>
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<DIV>-</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
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<TD>
<DIV>>25～30</DIV></TD>
<TD>
<DIV>1.7</DIV></TD>
<TD>
<DIV>4</DIV></TD>
<TD>
<DIV>0.55</DIV></TD>
<TD>
<DIV>8.5</DIV></TD>
<TD>
<DIV>2.2</DIV></TD>
<TD>
<DIV>4.2</DIV></TD>
<TD>
<DIV>1</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>30</DIV></TD>
<TD>
<DIV>15</DIV></TD>
<TD>
<DIV>12</DIV></TD></TR>
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<TD>
<DIV>>30～35</DIV></TD>
<TD>
<DIV>2</DIV></TD>
<TD>
<DIV>4.5</DIV></TD>
<TD>
<DIV>0.65</DIV></TD>
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<DIV>10</DIV></TD>
<TD>
<DIV>2.5</DIV></TD>
<TD>
<DIV>5</DIV></TD>
<TD>
<DIV>1</DIV></TD>
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<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>35</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>10</DIV></TD></TR>
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<TD>
<DIV>>35～40</DIV></TD>
<TD>
<DIV>2.3</DIV></TD>
<TD>
<DIV>5</DIV></TD>
<TD>
<DIV>0.75</DIV></TD>
<TD>
<DIV>11.5</DIV></TD>
<TD>
<DIV>2.9</DIV></TD>
<TD>
<DIV>5.8</DIV></TD>
<TD>
<DIV>1</DIV></TD>
<TD>
<DIV>120</DIV></TD>
<TD>
<DIV>115</DIV></TD>
<TD>
<DIV>90</DIV></TD>
<TD>
<DIV>-25</DIV></TD>
<TD>
<DIV>35</DIV></TD>
<TD>
<DIV>12</DIV></TD>
<TD>
<DIV>10</DIV></TD></TR></TBODY></TABLE></DIV>
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<DIV>备注</DIV></TD>
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<DIV>参数值按直径范围的中间值来定，允许偏差为±</DIV></TD>
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<DIV align=center>近似比例</DIV></TD>
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<DIV>h≈0.6d <BR>R≈0.2d(d≤25) <BR>r≈0.15d(d>25)<BR>b≈0.2d <BR>l≈0.2d(d≤25) <BR>l≈0.3d(d>25) </DIV></TD></TR></TBODY></TABLE></DIV>
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