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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) |
| ¡ñ |
Chisel edge regrinding part of Type SC for steel application doesn't need passivation chamfer. |
| ¡ñ |
For SX, MX, SS drill bit, their R part, chisel edge regrinding part should have even passivation chamfer |
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¡ñType SC-F SC-FQ, MX-F, MX-FQ drill bit's for cast iron, aluminum chisel edge regrinding part should have even passivation chamfer. |
¡ñIn 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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¡ô.Type SX, SC, MX, and SS for steel application(Chamfer a big arc in R part) |
Table 3 |
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¡«¦Õ6 |
¦Õ6¡«¦Õ12 |
¦Õ12¡«¦Õ20 |
| Soft steel |
¦È¡ã |
-25¡ã |
-25¡ã |
-25¡ã |
| H |
0.08¡«0.12 |
0.10¡«0.15 |
0.15¡«0.20 |
| Hard steel |
¦È¡ã |
-25¡ã |
-25¡ã |
-25¡ã |
| H |
0.05¡«0.10 |
0.08¡«0.12 |
0.10¡«0.15 |
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¡ô.Don't chamfer a big arc in R part (keep the edge unchanged) |
Table 4 |
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¦Õ6Under ¦Õ6 |
¦Õ6.1¡«¦Õ8 |
¦Õ8.1¡«¦Õ10 |
¦Õ10.1¡«¦Õ16 |
General cast iron
|
¦È¡ã |
-10¡ã |
-10¡ã |
-10¡ã |
-10¡ã |
| H |
0.03¡«0.05 |
0.04¡«0.06 |
0.05¡«0.07 |
0.06¡«0.08 |
| Ductile cast iron |
¦È¡ã |
-25¡ã |
-25¡ã |
-25¡ã |
-25¡ã |
| H |
0.05¡«0.07 |
0.06¡«0.09 |
0.08¡«0.11 |
0.10¡«0.12 |
| AL. Alloy |
¦È¡ã |
Not passivation chamfer |
| H |
Not passivation chamfer |
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¦È¡ã =angle H=passivation chamfer width
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Till now regrinding is finished, lastly confirm the following points before using |
¡ñThe difference of cutting edge height is controlled not exceeding 0.02mm |
¡ñThere is no remaining damage in cutting-edge.
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¡ñHad appropriate passivation chamfer |
¡ñ.Grinding burrs are removed. |
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Regrinding method {Type SD} |
¡ñRegrinding of SD drill bit is made as the following orders |
(1)Grinding of minor flank |
¡ñAs shown in the right figure, install the drill bit in the multi-purpose
grinding machine, shake the worktable to grind. |
¡ñLeave the flank of the body beforehand. |
¡ñ 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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