フラットドリルと先端角ありのドリル　どのように使い分ければよいか？ | オーエスジー

How do you know between a flat drill and a drill with point angle ?

counterboring Please use it in situations where it is not possible to process unless it is in that shape, such as machining, or in situations where a flat drill is advantageous.

Where flat drills are advantageous

・ Drilling in the inclined surface (at the entrance and pull out )

・Drilling holes on surfaces with uneven surfaces

・When burrs are likely to occur

・Plunge processing

Where drills with point angle are advantageous

• Drilling on flat surfaces

・High-efficiency machining

・Deep hole

Advantages of Flat Drills

The flat tip shape reduces the load in the direction of rolling over the part that is thinner and less rigid at the pull out of the workpiece, and the occurrence of burrs can be minimized. In addition, in situations where drilling on slopes or intermittent cutting is required at the pull out , the radial load on the drill is reduced, which reduces hole bending.

Disadvantages of flat drills

Because the tip is flat, the axial load = thrust on the drill increases, and the axial load on the tool life of the drill and the workpiece increases. In addition, the ADF, which is a flat drill, has a weakened helix angle for the purpose of increasing rigidity for intermittent cutting. Therefore, the chip ejection is lower than that of ordinary carbide drills.