RU1815008C - Helical drill - Google Patents

Abstract

Usage: in metalworking. when processing holes. SUMMARY OF THE INVENTION: the drill bit comprises a housing, a cutting part 2 with chip grooves 3. On the front surface 4 of each feather 5, corrugations 6 are made. The vertices 7 of the corrugations on one cross 5 are located diametrically opposite to the depressions 8 of the corrugations on the other. The tops 7 of the corrugations intersect the corresponding cutting edge 9 and are placed at an acute angle to the axis of the cutting part 2. 2 ill.

Description

The invention relates to the cutting of metals and can be used to process holes.

An object of the invention is to increase resistance by improving chip evacuation.

Figure 1 shows a spiral drill, a General view, figure 2 is a view along arrow A in figure 1.

The drill contains a housing 1, a cutting part 2 with chip grooves 3 on the surface of the housing 1. On the front surface 4 of each pen 5, the cutting part 2. corrugations are made 6. The tops 7 of the corrugations on one side 5 are located diametrically opposite to the hollows of 8 corrugations on the other side, while the corrugation vertices at each intersect intersect the corresponding cutting edge 9 and are placed at an acute angle 1 to the axis of the cutting part 2. The angle t) is selected from the following ratio:

tg tf

C about sin p Vb, 25 - CI

where p is the angle in plan;

Co is the ratio of the core to the diameter of the cutting part.

The drill works as follows.

In the process of drilling, the chips removed from the processed material along the corrugations 6, located at an acute angle 1) on the front surface 4, fall on

0

5

0

5

smooth surface 10 curls without being stuck in grooves 3.

The cross-sectional chips acquire a wave-like shape of the contact surface and contacts the surface of the helical grooves along the protrusions of the contact surfaces. Coolant easily penetrates under the protrusions, which reduces the contact area between the chip and the drill and the training force.

Claims (1)

SUMMARY OF THE INVENTION A twist drill comprising a cutting part with chip grooves, made in the form of two feathers provided with cutting edges, wherein corrugations are made on the front surface of each feather in order to increase durability drill bits due to improved chip evacuation, the corrugation tops on one side are diametrically opposite the corrugation hollows on the other side. Moreover, the corrugation tops on each side intersect the corresponding cutting edge and are placed at an acute angle to the axis of the cutting hour while the value of said angle is selected from the following ratio: thirty tg tjС о sin у vtas-CS where p is the angle in plan; With the ratio of the core to the diameter of the cutting part. w