What is advantages of trepanning drill?

The main advantages of the inner chip removal treapanning drill are:

(1) The cross-sectional area of the drill pipe is larger than that of the external chip removal method, so the rigidity is good.

(2) The coolant can lubricate and protect the guide block, the chips will not scratch the surface of the hole wall, and better dimensional accuracy and lower surface roughness value can be obtained.

(3) The coolant can better suppress the vibration of the drill pipe.

(4) As the fluid gap of the chip discharge port of the nesting drill becomes smaller, the flow velocity of the coolant is accelerated, the flow of chips is accelerated, and the chip removal effect is enhanced.

The main advantages of the outer chip trepanning drill are:

(1) No special oil feeder is needed, which simplifies the processing system.

(2) For nesting drilling with the same aperture, the chip removal area of the outer chip removal nesting drill is larger than that of the inner chip removal nesting drill.

(3) The cross-sectional shape of the outer chip removal channel is not affected by the core material.

(4) For nesting processing with large diameter and large aspect ratio, it is more reasonable to use external chip removal