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Passivation chamfer angle and width depend on the type of drill bit, diameter and material of work piece,
make appropriate passivation chamfer according to table 3, table 4. |
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Tips for passivation chamfer (figure 3) |
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（1）Please chamfer a expanded arc in R part.
(Drill bit doesn't round Type SC-F, SC-FQ, MX-F, MX-FQ for cast iron aluminum use, please keep the edge unchanged) |
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（2） Please chamfer the edge of cutting edge (rough chamfer) (use #170 electroplated diamond file) |
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（3） Precisely chamfer (use #400-#600diamond manual grinding tool) |
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Chisel edge regrinding part of Type SC for steel application doesn't need passivation chamfer. |
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For SX, MX, SS drill bit, their R part, chisel edge regrinding part should have even passivation chamfer |
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●Type SC-F SC-FQ, MX-F, MX-FQ drill bit's for cast iron, aluminum chisel edge regrinding part should have even passivation chamfer. |
●In the diameter range of various drill bits, small-diameter drill bits have small passivation chamfer, and large-diameter chamfer have large passivation chamfer |
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◆.Type SX, SC, MX, and SS for steel application(Chamfer a big arc in R part) |
Table 3 |
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～φ6 |
φ6～φ12 |
φ12～φ20 |
| Soft steel |
θ° |
-25° |
-25° |
-25° |
| H |
0.08～0.12 |
0.10～0.15 |
0.15～0.20 |
| Hard steel |
θ° |
-25° |
-25° |
-25° |
| H |
0.05～0.10 |
0.08～0.12 |
0.10～0.15 |
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◆.Don't chamfer a big arc in R part (keep the edge unchanged) |
Table 4 |
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φ6Under φ6 |
φ6.1～φ8 |
φ8.1～φ10 |
φ10.1～φ16 |
General cast iron
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θ° |
-10° |
-10° |
-10° |
-10° |
| H |
0.03～0.05 |
0.04～0.06 |
0.05～0.07 |
0.06～0.08 |
| Ductile cast iron |
θ° |
-25° |
-25° |
-25° |
-25° |
| H |
0.05～0.07 |
0.06～0.09 |
0.08～0.11 |
0.10～0.12 |
| AL. Alloy |
θ° |
Not passivation chamfer |
| H |
Not passivation chamfer |
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θ° =angle H=passivation chamfer width
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Till now regrinding is finished, lastly confirm the following points before using |
●The difference of cutting edge height is controlled not exceeding 0.02mm |
●There is no remaining damage in cutting-edge.
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●Had appropriate passivation chamfer |
●.Grinding burrs are removed. |
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Regrinding method {Type SD} |
●Regrinding of SD drill bit is made as the following orders |
(1)Grinding of minor flank |
●As shown in the right figure, install the drill bit in the multi-purpose
grinding machine, shake the worktable to grind. |
●Leave the flank of the body beforehand. |
● Lastly make no-sparkle grinding. The difference of cutting-edge
height shall be controlled not exceeding 0.03mm.
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Remark:Regarding the details of regrinding, please negotiate through
another method. |
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Accept regrinding, recoating order, but must have a certain
quantity to adjust equipment's power consumption. |
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