Каталог Sumitomo сверла и развертки - страница 133

■ Troubleshooting for Drilling

Failure Countermeasures Failure Countermeasures

Large Hole Diameter Return Mark

Reduce the run-out as much as possible Reduce the run-out as much as possible (use a holder with a diameter correction (use a holder with a diameter correction

mechanism).

• mechanism).

Decrease the cutting speed.

• Check the cutting edge for damage (the

Increase the feed rate.

• existence of built-up edges).

Increase the coolant concentration.

• Reduce the machining allowance.

Reduce the machining allowance.

• Change to an insert with a sharper

Check the cutting edge for damage (the cutting edge.

existence of built-up edges).

• Decrease the return (lifting) feed.

Change the reamer diameter. ・Reduce the run-out as much as possible Tapered Hole Irregular Cutting Noise (use a holder with a diameter correction mechanism). ・Decrease the cutting speed. ・Decrease the coolant concentration.

・Decrease the feed rate.

• Increase the machining allowance.

Adjust the coolant concentration.

• Check the cutting edge for damage.

Review the pre-machining process.

• Change the approach angle of the insert

Review the clamping method of the workpiece.

• cutting edge.

Compare the hole size between when the workpiece is clamped and unclamped.

• Check and correct the direction of chip evacuation.

Chatter Mark on Machined Surface Small Hole Diameter ・Reduce the run-out as much as possible (use a holder with a diameter correction

mechanism). ・Replace the insert.

• Change the approach angle of the insert Decrease the coolant concentration. cutting edge. ・Increase the machining allowance.
• Review the clamping method of the Increase the cutting speed. workpiece. ・Decrease the feed rate.

・Decrease the cutting speed. ・Increase the feed rate.

Poor Surface Roughness ・Check the cutting edge for damage. ・Reduce the run-out as much as possible (use a holder with a diameter correction mechanism).

• Check whether the cutting conditions are within the recommended range. J

・Change to internal coolant supply. ・Increase the coolant concentration.

Solid

• Important Notes About SD Type (Center Bolt Clamp Type) Special This product can be used for both through-hole and Blind-hole drilling. However, the head of the center bolt protrudes from the end Indexable of the body. Therefore, ensure clearance by referring to the protrusion amount of the center bolt (LFA) shown in the dimension table.

Reamer Through-hole Drilling Stop-hole Drilling Brazed Others

Obstacle Bottom Face of Workpiece