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Drill bit for percussive drilling

A technology of percussion drill and drill bit, applied in the direction of drill bit, drill pipe, drill pipe, etc., can solve the problems of damaged drill bit and large degree.

Inactive Publication Date: 2015-01-21
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem with drill bits of the type described above is that the amount of reflected energy (i.e. energy reflected from the rock face) is so great that this can damage the drill bit as well as other associated equipment

Method used

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

Examples

Experimental program
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Embodiment Construction

[0034] reference now figure 1 , which describes a drill bit (1) for use in percussion drilling. Said drill bit (1) comprises a drill bit body (2) made of a suitable tool steel grade, the drill bit body (2) having a front surface (4) longitudinally relative to the drill bit body (2) an axis extending substantially transversely; and a rear threaded portion (6) enabling the drill bit (1) to be threadedly attached to a drill rod (not shown) having a corresponding thread.

[0035] A plurality of surface spherical teeth (10) projecting from the front surface (4) and protruding axially are located on the front surface (4).

[0036] Around the periphery of the front surface (4) a plurality of gauge ball teeth (20) inclined at an angle with respect to the longitudinal axis of the drill bit (1) are arranged. The gauge balls (20) protrude and protrude so that the diameter of the drilled hole is defined by the gauge balls (20).

[0037] The ball teeth (10 and 20) are press-fit or shri...

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PUM

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Abstract

This invention relates to a drill bit (1) for use in percussive drilling, the drill bit (1) comprising a body (2) having a front face (4), at least one button on the front face (hereinafter 'face button') (10), and a plurality of gauge buttons (20), each of the buttons (10 and 20) having a working face (10a and 20a). At least a portion of at least one gauge button (20) working face (20a) has a curvature which deviates further from being flat by comparison to a curvature of any curved portion of at least one face button (10) working face (10a), so that said portion of at least one gauge button (20) working face (20a) projects further than said portion of at least one face button (10) working face (10a).

Description

technical field [0001] For explanation, reference will be made to the use of the drill bit in top hammer percussion drilling of rock, but the drill bit can also be used in other kinds of percussion drilling, for example in DTH. Background technique [0002] Balls or inserts for drills of this type generally have a cylindrical body comprising opposing ends, one of which includes a working face for the ball, shaped as Protrudes from the body of the ball teeth. More particularly, the shape of the working surface is generally hemispherical (dome) or parabolic (ballistic). [0003] Typically, gauge buttons have a diameter greater than or equal to the surface buttons. Examples of this can be found inter alia in documents US 3,519,092, US 3,997,011 and US 4,572,307, likewise herein figure 2 shown in. [0004] A problem with drill bits of the type described above is that the degree of reflected energy (ie, energy reflected from the rock face) is so great that this can damage the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/36E21B10/56E21B17/10
CPCE21B10/36E21B17/1092E21B10/56
Inventor 肯尼斯·拉尔森
Owner SANDVIK INTELLECTUAL PROPERTY AB