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Drill bit for percussive drilling

a drilling bit and percussive technology, applied in drilling casings, drilling pipes, cutting machines, etc., can solve problems such as damage to the bit and other associated equipmen

Inactive Publication Date: 2015-02-12
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a drill bit for percussion drilling that has a front face with at least one button and a plurality of gauge buttons. Each gauge button has a working face that is curved, with the curved portion of the working face projecting further than the front face button. The working face of each gauge button may have a different curvature than the front face button. The drill bit may also have a cylindrical body with a different radius of curvature than the curved portion of the working face button. The invention provides improved drilling performance by optimizing the interaction between the drill bit and the rock during drilling.

Problems solved by technology

A problem with bits of the above described type is that an extent of reflected energy (ie. reflected from the rock face) is so great that this can damage the bit and other associated equipment.

Method used

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  • Drill bit for percussive drilling
  • Drill bit for percussive drilling
  • Drill bit for percussive drilling

Examples

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Embodiment Construction

[0034]Referring now to FIG. 1, where there is illustrated a drill bit (1) for use in percussive drilling. The drill bit (1) comprises a bit body (2) of an appropriate tool steel grade having a front face (4) which extends generally transversely relative to a longitudinal axis of the bit body (2), and a rear threaded portion (6) so the drill bit (1) can be threadably attached to a drill rod (not illustrated) having corresponding threads.

[0035]Located in the front face (4) is a plurality of face buttons (10) which project and protrude axially therefrom.

[0036]Located around the periphery of the face (4) is a plurality of gauge buttons (20) inclined at an angle with respect to the longitudinal axis of the bit (1). The gauge buttons (20) project and protrude to such an extent that the diameter of the drill hole is defined by these.

[0037]The buttons (10 and 20) are either press-fit or shrink-fit into the bit body (2), and so are commonly and even interchangeably referred to as inserts. Th...

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PUM

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Abstract

A drill bit for use in percussive drilling includes a body having a front face, at least one face button on the front face, and a plurality of gauge buttons. Each of the buttons has a working face. At least a portion of at least one gauge button working face has a curvature which deviates further from being flat by comparison to a curvature of any curved portion of at least one face button working face, so that the portion of at least one gauge button working face projects further than the portion of at least one face button working face.

Description

[0001]For the purpose of explanation reference will be made to use of the drill bit in top hammer percussive drilling of rock, but it can also be used in other kinds of percussive drilling, such as DTH.[0002]Buttons or inserts for bits of this type generally have a cylindrical body with opposing ends, one of which comprises a working face for the button that is shaped so as to protrude from the body of the button. More particularly, this working face is generally hemispherical (domed) or parabolic (ballistic) in shape.[0003]Typically, gauge buttons have a diameter which is larger than or equal to face buttons. Examples of this can be found in U.S. Pat. No. 3,519,092, U.S. Pat. No. 3,997,011 and U.S. Pat. No. 4,572,307 amongst others, as well as being illustrated in FIG. 2 herein.[0004]A problem with bits of the above described type is that an extent of reflected energy (ie. reflected from the rock face) is so great that this can damage the bit and other associated equipment.[0005]In...

Claims

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Application Information

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IPC IPC(8): E21B10/36E21B10/56
CPCE21B10/56E21B10/36E21B17/1092
Inventor LARSSON, KENNETH
Owner SANDVIK INTELLECTUAL PROPERTY AB