SU581250A1 - Rotary drilling method - Google Patents

Description

one

This invention relates to methods for rotary drilling holes and holes in rocks and soils.

Various methods are known for drilling holes and wells, which are used depending on the strength of the rock and other factors. In particular, a drilling method is known that allows round and non-circular cross-section wells to pass, according to which a constant axial load is created on the cutting tool and oscillating movements around its longitudinal axis are directed alternately in a clockwise direction and opposite to it, for which a full hydraulic turn is used. engine j.

However, the known method is used only for drilling rocks of low strength.

The closest technical solution to the proposed method is a rotary drilling method in which a feed force directed along its axis is applied to the cutting tool and the rotation 2j is communicated to it

The disadvantage of this method is that when drilling rocks with a fortress greater than 9 on the proto-horse scale, the drilling speed is noticeably reduced, intense heating and wear of the cutting edges of the carbide plates with which the tool is reinforced.

The purpose of the invention is to increase the speed of drilling.

This is due to the fact that the rotation of the cutting tool is periodically stopped when the feed force is constantly affected by it.

At the moment of stopping the rotation, more intensive cooling of the tool cutters occurs, the circumferential force is reduced, pressing the tool cutters to the rock chips, as a result of which the forces of friction of rocks on the front edge of the tool are eliminated and the tool under the action of a constantly applied axial load is additionally introduced high rate of drilling

Claims (2)

The proposed method is carried out using a rotary drilling machine equipped with a pulsating coupling which is installed between the machine spindle and the rod and adjusted to a specific mode of operation (with pulsation or without pulsation of rotation, with short or long stops, with slipping or without slipping). drilling time) Then turn on the engine of the machine, the tool is fed to the bottom. During the drilling process, the clutch rotates with the rod and makes one or two stops per turn, resulting in cyclic removal of rock chips with tool cutters. When drilling weak rocks, when the thickness of the chips being removed is already large, the coupling does not pulsate, but serves as a safety tool for the cutting drilling tool against overload. When drilling hard rock when a large axial load is required, the flour pulsates and provides a higher feed with the same axial load. Experiments show that due to a constant axial and variable torsional load, any thickness of the removable chips can be achieved, which significantly increases the drilling rate. The proposed method does not require special machines, as the pulsating clutch is performed by conventional, somewhat improved friction clutches. bevelled surfaces, which can be mounted on any machine with a rotating action. The invention of the method of rotational drilling, in which the cutting tool is directed to its cutting tool along its axis and informed about the rotation, in order to increase the speed of drilling, the rotation of the cutting tool is periodically stopped when the feeding force is constantly applied to it. . Sources of information taken into account in the examination: 1. USSR Patent No. 1604853, cl. E 21 S 1/00, 1970. 2. USSR author's certificate number 117251, cl. E 21 C 1/02, 1957.