SU1252074A1 - Twist drill - Google Patents

Description

one

The invention is related to metal cutting, namely drilling of inclined holes in parts from heat-resistant, titanium and aluminum alloys.

The purpose of the invention is the expansion of technological capabilities.

FIG. 1 shows a drill, general view; in fig. 2 - drill during operation.

The drill contains the main cutting edges 1, sharpened with a reverse cone at an angle of 2 × 200 ° and transitional cutting edges, sharpened with a transition cone at an angle on the length, 5-0.8 mm. The entire length of the cutting edges sharpened at an angle, and the tasks and 14, respectively, on the main and transitional cutting edges.

The drill works as follows.

When drilling inclined holes at the initial moment, the drill works simultaneously with two cutting edges: on the reverse and forward cones. This contributes to the formation on the inclined surface of the part V-shaped

1252074

five

0

five

grooves that prevent the drill axis from shifting. As a result, equilibrium radial forces, a decrease in the level of vibrations, and an increase in the stability of the drill are observed.

A similar picture occurs when the drill leaves the material being processed. In addition, the proposed shape of the cutting part helps to eliminate burrs. To increase rigidity and vibration resistance, the drills have V-shaped chip grooves and an increased core diameter.

This technical solution made it possible to eliminate site preparation operations, perpendicular to the axis of the hole, and deburring the burrs, balance the radial forces at the time of plunging, eliminate spinning and vibration, increase the durability and strength of the drills, as well as machining performance. In addition, such a construction allows reducing the lead axis of the hole and improving the quality of processing.

2

Compiled by N. Kirillov Editor N. Bobkova Tehred I. Komkalo Proofreader T. Kolb

Order 4568/14 Circulation 1001 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

SPIRAL DRILL, consisting of a shank and a cutting part including a main cutting edge in the form of a reverse cone with respect to the shank and a transition cutting edge in the form of a straight cone located between the main cutting edge and the guide ribbon, and the rake angle γ is 5 ° along the entire length of the cutting edges, characterized in that, in order to expand technological capabilities, the angle in terms of the main cutting edge 29 is 200 °, and the angle in terms of the transition cutting edge 2 9 is 140 ° at a length f of 0.5- 0.8 mm, with rear cT angle is 18 ° and 14 respectively on the main cutting edges and transition. _