RU2230174C2 - Diamond crown bit - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: device has ring-shaped body with connecting thread, matrices with diamond-containing sectors fixed on device. Sectors are fixed to the matrix by methods of powder metallurgy. Sectors are made in form of rectangular trapezoids with sharp angles at greater foundation. Sharp angle of rectangular trapezoid of each following sector is located on the side, which is opposite to the sharp angle of rectangular trapezoid of previous sector. Sectors are separated by washing channels. Through each three sectors a rectangular-shaped sector is placed. EFFECT: increased mechanical boring speed. 5 dwg

Description

The invention relates to the field of mining, and in particular to a rock cutting tool for drilling coring.

Known diamond drill bit, adopted for the analogue, consisting of an annular body with a connecting thread, a matrix with diamond-secured sectors fixed to it, separated by flushing sectors (AS USSR No. 473801, class E 21 B 9/36, 1973). In analogue, the contact area of the cutting sectors is large. which leads to small specific loads on the rock, respectively, a decrease in the depth, and hence a decrease in the mechanical drilling speed.

Also known is a diamond drill bit, adopted for the prototype, consisting of an annular body with connecting thread, a matrix with diamond-shaped sectors fixed to it in the form of rectangular trapezoid with sharp angles with a larger base, while the acute angle of the rectangular trapezoid of each subsequent sector is located on the side opposite the acute angle of the rectangular trapezoid of the previous sector, and the sectors are separated by flushing channels (AS USSR No. 719192, class E 21 10/46). In the prototype, during the drilling process, sectors made in the form of rectangular trapezoids acquire a wedge-shaped shape. Thus, the area of contact between the sectors and the rock increases, the specific load on the rock decreases, which means that the indentation in the rock decreases, and the mechanical drilling speed also decreases.

The objective of the invention is to increase the mechanical drilling speed.

To solve this problem, in a diamond drill bit consisting of an annular body with a connecting thread, a matrix with diamond-containing sectors fixed to it in the form of rectangular trapezoids with sharp angles with a larger base, while the acute angle of the rectangular trapezoid of each subsequent sector is located on the side opposite to the sharp the corner of the rectangular trapezoid of the previous sector, and the sectors are separated by washing channels, every three sectors an additional sector is set in the form of a rectangle.

The invention is illustrated in the drawing, which shows:

Figure 1 - diamond drill bit.

Figure 2 is a left view.

In figure 3, 4, 5 - sections aa, bb, bb of the diamond drill bit.

The diamond drill bit consists of an annular body 1 with a connecting thread 2, a matrix 3 with diamond-containing sectors fixed to it 4. Sector 4 is attached to the matrix by powder metallurgy. Sectors 4 are made in the form of rectangular trapezoids (see Fig. 3, 4 cuts A-A, BB) with acute angles with a larger base. In this case, the acute angle of the rectangular trapezoid of each subsequent sector is located on the side opposite to the acute angle of the rectangular trapezoid of the previous sector (see figure 2).

Sectors are separated by washing channels 5. After every three sectors, sector 6 is installed in the form of a rectangle. It was experimentally found that the optimal solution to the problem (increasing the mechanical drilling speed) is to install a sector in the form of a rectangle every three sectors.

The inventive device allows to solve the problem.

Indeed, the additional installation of sectors 6 in the form of rectangles allows you to strengthen the peripheral parts of the crown with additional diamonds. Thus, during drilling, the wear of the peripheral part is reduced, therefore, the transition of the working surfaces of sectors 4 to a wedge shape is prevented.

Thus, there is no increase in the area of contact between the sectors and the rock (as in the prototype), therefore, the specific load on the rock does not decrease, and the mechanical drilling speed increases.

The device operates as follows.

The diamond drill bit is fixed to the core pipe, which is placed on the bottom of the well. When applying axial load and rotation, a process of deepening occurs in the rock. Drilled rock is removed from the bottom by flushing fluid.

The proposed diamond crown provides an increase in the mechanical drilling speed.

Claims (1)

A diamond drill bit consisting of an annular body with a connecting thread, a matrix with diamond-shaped sectors fixed to it in the form of rectangular trapezoid with sharp angles with a larger base, while the acute angle of the rectangular trapezoid of each subsequent sector is located on the side opposite to the acute angle of the rectangular trapezoid of the previous sector , and the sectors are separated by washing channels, characterized in that every three sectors an additional sector is set in the form of a rectangle.

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