SU1366628A1 - Diamond drill bit - Google Patents

Abstract

The invention relates to a rock-destroying tool and allows to expand the field of use of the bit by changing the front angle (PU) of the cutting plates (RP). The bit includes a housing 1 with flushing channels 2, a working head 3 and rock-breaking elements 4 installed in it in the form of a diamond RP 5. They are fixed on holders whose longitudinal axes (SW) are at an angle to the cutting plane, carried through RP 5 points on the forming working head. At the same time, the software holders and RP 5 are inclined to each other at an angle of 1/3 (- (/ ;;) / 2, and the angle of inclination of the software holders to the cutting planes is i (t + /) / 2, where / - PU tilting RP 5 when drilling hard rocks; / - the same when drilling soft rocks. When drilling hard rocks, holders unlock and rotate elements 4 by 180 around software holders. where the value of PU is equal to / -. In soft rocks, the holders are fixed so that the PU has a value. 6 ill. s (L

Description

Turn around the longitudinal axis of the holder 6 at an angle of 180 and fixing in the final position. For this, the holders can have a tapered surface D (Fig. 3 and 4) or a multi-faceted surface E (Fig. 5 and 6) and be fixed in the corresponding through holes of the working head by any known method, for example, by means of a threaded joint 1- (Fig. 3 and 5) or retaining ring 8 (Fig. 4). Other embodiments of the form of the holders and methods for fastening them in the openings of the working head are possible.

Each diamond cutting plate 5 is fixed on the holder 6 so that its longitudinal axis is inclined to the longitudinal axis of the holder at an angle

A diamond drill bit containing a housing with industrial channels, a working head and installed in

rock cutting elements in the form of diamond cutting plates attached to holders, the longitudinal axes of which are at an angle to the plane of cutting, carried out through the points of the plates lying on the generator of the working head, the area of application of the bit due to the change of the front angle of the cutting plates, the rock-breaking elements are installed with the possibility of rotation around the longitudinal axis of the holder at an angle of 180 and fixation in the final position, while the longitudinal axis of the plate is inclined to longitudinal axis of the holder at an angle

J

 . 2

wherein the angle of inclination of the longitudinal axes of the holders to the cutting plane is taken to be

  j / L ±,

where ff is the rake angle of the cutting plate when drilling hard rocks;

with

(fr - / m

50

and the angle of inclination of the longitudinal axes of the holders to the cutting planes is

   7

55 where (/ t- and D, - cutting rake angle

plates when drilling appropriately hard and soft rocks.

figl

FIG. five

-

FIG. 6

Claims (1)

Claim / Diamond drill bit containing a housing with flushing channels, a working head and rock-cutting elements installed in it in the form of diamond cutting plates mounted on holders, the longitudinal axis of which are located at an angle to the plane cutting depth, drawn through the points of the plates lying on the generatrix working head, characterized in that, in order to expand the field of application of the bit by changing the rake angle of the cutting inserts, the rock cutting elements are mounted to rotate around the longitudinal axis of of the tool at an angle of 180 ° and fixation in the final position, while the longitudinal axis of the plate is inclined to the longitudinal axis of the holder at an angle and the angle of inclination of the longitudinal axis of the holders to the cutting planes is tr, e A ^and ^ m ~ the front angle of the cutting insert when drilling respectively hard and soft rocks. fi & 2 A-A £ JL FIG 5