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Aiguille blade assembly, drill pipe containing same and aiguille blade for self-drilling pole or anchor shaft

A drill bit assembly and drill bit technology, which is applied in the direction of drill bits, bolt installation, drilling equipment, etc., can solve the problems of reducing the scrap rate, etc., and achieve the effect of increasing the bonding strength and eliminating the scrap rate of the drill bit

Inactive Publication Date: 2006-04-05
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The scrapping of inaccurately formed drill bits results in considerable expense for the drill bit manufacturer and it is therefore desirable to reduce the scrap rate

Method used

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  • Aiguille blade assembly, drill pipe containing same and aiguille blade for self-drilling pole or anchor shaft
  • Aiguille blade assembly, drill pipe containing same and aiguille blade for self-drilling pole or anchor shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The figures show a drill assembly comprising a drill insert 10 and a drill bit 11 to which the drill insert 10 is attached in FIGS. 4 to 6 . The drill insert 10 includes a pair of cutting edges 12 inclined toward a central apex, and a pair of side cutting edges 13 .

[0022] The drill bit 11 is formed with a rear sleeve 14 which is cylindrical and arranged to be received in the front end of the drill rod so as to be fixed therein. The sleeve 14 may be externally threaded for threaded engagement with the drill pipe, or it may be secured to the drill pipe by other means such as welding.

[0023] The drill bit 11 includes a central bore 15 extending through the drill bit 11 and leading to a front end 16 of the drill bit 11 . The holes 15 are flush holes which assist in delivering flush media through the nose during drilling operations to flush and remove debris from the nose.

[0024] Front end 16 includes a pair of axially extending support elements 17 and each support ...

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PUM

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Abstract

A drill tip and a drill bit assembly including a leading end 16 to which a drill tip 10 is fixed by bonding. The drill tip 10 has a top cutting edge 12, a pair of side cutting edges 13, a bottom edge 20 and a pair of parallel side walls 26 extending between the respective edges. The leading end 16 being arranged to support the drill tip 10 along the bottom edge 20 and against the parallel side walls 26. The drill bit 10 including a bore 15 extending axially therethrough and opening into the leading end 16 and the drill tip 10 extending across the bore 15 but permitting egress of flushing liquid from the bore 15 at the leading end 16. The drill tip 10 being arranged to cooperate with an engagement face 25 formed at the leading end 16 to locate the drill tip 10 in a bonding position relative to the leading end 16 prior to bonding of the drill tip 10 to said leading end 16. The cooperation being such as to resist shifting movement of the drill tip 10 along the bottom edge 20 away from the bonding position.

Description

technical field [0001] The invention relates to a drill bit, especially a drill bit for rock drilling. The invention also relates to bolts of the self-drilling type. Background technique [0002] Rod bolts are commonly used in the underground mining industry to support the walls and / or roofs of excavated tunnels and openings to prevent them from breaking and collapsing. The bolt is usually applied by first drilling a hole in the rock wall and then inserting the bolt therein. A curable glue such as resin or cement mortar is usually used to fix the bolt in the hole. [0003] Drill rods typically have a separate drill bit assembly, comprising a drill bit and carbide inserts, that is secured to the drill rod at one end of the drill rod. The other end of the drill rod includes means for engaging a drive assembly, such as a hydraulic or pneumatic drill. Drills are typically cast from steel and machined as required, and carbide drill inserts are preferably held concentrically o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/58E21D21/00
CPCE21D2021/0053E21B10/58E21D21/0053
Inventor 约翰·巴里
Owner SANDVIK INTELLECTUAL PROPERTY AB