DK152555B

DK152555B - STONE DRILL, ISAIR FOR HAMMER DRILLING MACHINES

Info

Publication number: DK152555B
Application number: DK146185A
Authority: DK
Inventors: Mogens Nielsen
Original assignee: Joran Bor A S
Priority date: 1985-04-01
Filing date: 1985-04-01
Publication date: 1988-03-14
Also published as: DK146185D0; DK146185A; DE3609911C2; DE3609911A1; DK152555C

Description

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Opfindelsen angår et stenbor af den i krav l's indledning angivne art.The invention relates to a rock drill of the kind specified in the preamble of claim 1.

Ved kendte stenbor af denne art forløber bunden af boremelsnoten eller -noterne i det væsentlige parallelt med 5 borets akse, se f.eks. DE-B1 2 358 447 eller danner en sådan spids vinkel med borets akse, at notdybden vokser i retning imod boreskæret, se dansk patentansøgning nr. 3382/78. Begrundelsen for den sidstnævnte løsning er, at der til trods for et tiltagende slid imod mellem-10 stykkets rygflade stadig skal være plads nok til bore melet, som i regelen transporteres i den underste tredjedel af noten, beliggende på boremelsfladen, som er den sideflade af mellemstykket, som vender bort fra bore-skæret .In the case of known stone drills of this kind, the bottom of the drill bit groove or grooves extends substantially parallel to the axis of the drill, see e.g. DE-B1 2 358 447 or forms such a pointed angle with the drill axis that the groove depth increases in the direction towards the drill bit, see Danish patent application no. 3382/78. The reason for the latter solution is that despite increasing wear and tear on the back surface of the middle piece, there should still be enough space for the flour, which is usually transported in the lower third of the groove, located on the surface of the drill flour, which is the side surface of the the spacer which faces away from the drill bit.

15 Opfindelsen har til formål at tilvejebringe en sådan udformning af boremelsnoten, at man i forhold til de tidligere kendte bor opnår en bedre og hurtigere, dvs. mere effektiv transport af boremel op frå borehullet og dermed nedsætter det til boringen nødvendige effektfor-20 brug og opnår nøjagtigere huller.The invention has for its object to provide such a design of the drill flour note that, in comparison with the prior art drills, a better and faster, i.e. more efficient transport of drilling flour up from the wellbore, thus reducing the power consumption needed for the drilling and achieving more accurate holes.

Dette formål opnås ifølge opfindelsen ved, at det indledningsvis angivne stenbor er ejendommeligt ved det i krav l's kendetegnende del angivne.This object is achieved according to the invention in that the stone drill initially stated is peculiar to the characteristic part of claim 1.

Den i krav 1 angivne spidse vinkel bevirker, at boret, 25 set i tværsnit, opnår en kileform, som under borets rotation medvirker til boremelets transport op fra borehullet, idet bundfladen, set i et tværsnit af boret, forløber i jævnt voksende afstand fra borehullet, set i borets omdrejningsretning.The pointed angle of claim 1 causes the drill 25, seen in cross-section, to obtain a wedge shape which, during rotation of the drill, contributes to the transport of the drill flour up from the borehole, the bottom surface, seen in a cross-section of the drill, extending at a uniformly increasing distance from the borehole , seen in the direction of rotation of the drill.

30 Opfindelsen skal i det følgende nærmere beskrives med henvisning til tegningen, hvorpå 2The invention will now be described in more detail with reference to the drawing, in which: 2

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fig. 1 viser et stenbor ifølge opfindelsen, set fra siden, fig. 2 viser et tværsnit langs linien 2-2 i fig. 1, og fig. 3 viser et aksialt længdesnit gennem en del af 5 det i fig. 1 viste bor.FIG. 1 is a side view of a rock drill according to the invention; FIG. 2 shows a cross section along the line 2-2 in FIG. 1, and FIG. 3 shows an axial longitudinal section through a portion of 5 shown in FIG. 1.

Det på tegningen viste stenbor har et boreskær 2 og to boremelsnoter 3 og 4, som i den aksiale retning er begrænset af to vindelformede om borets akse forløbende mellemstykker 5 og 6, som er udformet på den for 10 bor kendte måde.The stone drill shown in the drawing has a drill bit 2 and two drill bit grooves 3 and 4, which in the axial direction are limited by two spiral shaped spacers 5 and 6 extending around the axis of the drill, which are formed in the manner known for 10 drills.

Som vist i det aksiale længdesnit i fig. 3 er boremelsnoternes 3 og 4 bund henholdsvis 7 og 8 i det væsentlige retliniet og danner en spids vinkel a med borets 1 akse 9. Denne spidse vinkel α forløber til en sådan 15 side, at notdybden aftager i retning imod bereskæret 2.As shown in the axial longitudinal section of FIG. 3, the bottom of the drill flour grooves 3 and 4 are respectively rectilinear and form an acute angle α with the axis 9 of the drill 1. This acute angle α extends to such a side that the groove depth decreases in the direction towards the cutting insert 2.

Når stenboret 1 har det på fig. 3 viste længdesnit med den spidse vinkel a, vil det som følge heraf have det på fig. 2 viste tværsnit, som er karakteristisk ved, at borehullet 10 og hver af noterne 3 og 4 danner den 20 viste kileform imellem borehullet 10 og notbunden hhv.When the rock drill 1 has it in FIG. 3, with the acute angle a, as a result, it will have that of FIG. 2, which is characterized in that the borehole 10 and each of the grooves 3 and 4 form the wedge shape shown between the borehole 10 and the groove bottom respectively.

7 og 8 i forhold til borets omdrejningsretning, der er vist med pilen P. Boret er som vist set fra bore-skæret 2 i retning imod skaftet 12. Det skal bemærkes, at kileformen ikke opstår, hvis vinklen α er 0°, idet 25 buerne 7, 8 og 10 da er koncentriske.7 and 8 with respect to the direction of rotation of the drill shown by the arrow P. The drill is, as seen from the drill bit 2, towards the shaft 12. It should be noted that the wedge shape does not occur if the angle α is 0 °, 25 the arcs 7, 8 and 10 then are concentric.

Den spidse vinkel a er imellem 1° og 12° og fortrinsvis imellem 1° og 6°.The acute angle α is between 1 ° and 12 ° and preferably between 1 ° and 6 °.

Det er netop denne af den spidse vinkel ot betingede kileform, som forårsager den mere effektive transportIt is precisely this of the acute angle and conditional wedge shape that causes the more efficient transport

Claims

5 Patent claims:

A rock drill (1), especially for hammer drills, with drill bits (2) and with a drill shank shaped with at least one drill bit groove extending about the axis of the drill, which is defined in the axial direction by at least one spiral-shaped drill bit about the drill bit ( 1) axis (9) extending intermediate piece (5,6), characterized in that the bottom (7,8) of the drill bit (3,4), seen in a longitudinal section through the axis (9) of the drill (1) and the groove-limiting parts of the spacer (5,6), mainly extends the rectilinear and forms such a pointed angle (a) with the axis (9) of the drill (1) that the groove depth decreases in the direction towards the drill bit (2).

Stone drill according to claim 1, characterized in that said acute angle (a) is between 1 ° and 12 °, preferably 1 ° to 6 °.