DE202010006336U1 - Multi-stage drill with special course of the chip groove - Google Patents

Abstract

Multi-step drill (1) for drilling bores on demand
with different diameters
with a rotation axis (A),
with a drill bit (BS),
with a plurality of cylinder-like sections (a1, a2, a3, ... a14) of different diameter, each having a chip-groove edge,
with conically formed transitional areas (ü1, ü2, ü3, ... ü14) each having a cutting edge (s1, s2, s3, ... s14) between the cylinder-like sections,
and at least one helical chip groove (S) intersecting the cylinder-like sections and the transition regions,
wherein the chip groove (S) has an imaginary chip-groove baseline (G) on the chip-groove bottom, which runs helically around the axis of rotation (A),
wherein the pitch angle (w) of the chip-groove baseline (G) lies in a point (P) lying on this chip-groove baseline (G) between the imaginary tangent (T) passing through this point (P) at the chip Groove baseline (G) and the imaginary by this point (P) extending parallels (PA) to the axis of rotation (A) is formed,
characterized,
that the pitch angle (w) of the chip groove (S) ...

Description

The The invention relates to multi-stage drills for on-demand drilling Holes with different diameters without changing the drill.

By doing German utility model 203 185 29.3 a multi-stage drill is described, which has the following features:
A rotation axis, a drill tip, a plurality of cylinder-like sections of different diameters, each with a flute edge, conically shaped transition regions, each having a cutting edge between the cylinder-like sections and at least one these sections and the transition regions anschneidende helical flute.

The same features also have a multi-stage drill, which under the catalog number 810504/09 p. 53 of RUKO GmbH Präzisionswerkzeuge (Holzgerlingen, Germany) is sold. The chip groove of this multi-stage drill has the following characteristics (see also 1 ).

The Chip groove S has an imaginary chip-groove baseline at the chip-groove bottom G on which helically about the axis of rotation A. runs, wherein the pitch angle w of this chip-groove baseline G in a lying on this Span-groove baseline G point P between the by the point P extending imaginary tangent T at the chip-groove baseline G and the imaginary parallels running through this point P. PA is formed to the rotation axis A.

to Explanation of the chip-groove baseline G is noted that the Flute in a sectional view perpendicular to the drill axis A lying sectional plane each having a point, which of the Drill axis A is closest. Become for all cutting planes connecting all these points together results in the chip-groove baseline G. It runs helically around the drill axis A on an imaginary cone surface.

at the above-mentioned multi-stage drill (according to the prior the technique) is the pitch angle w of the chip groove S of cylinder-like Section to cylinder-like section a1 / a2, a2 / a3, a3 / a4, ... different for deviations of more than 3 degrees.

at Such a course of the pitch angle of the chip groove is the Spanabfluß not optimal during the drilling process.

It is therefore an object of the invention to provide a multi-stage drill with improved Spanabfluß behavior pretend.

These The object of the invention is characterized by the characterizing part of Claim 1 specified features solved.

1 shows a multi-stage drill to represent the imaginary flute baseline and its pitch angle in one point.

The multi-step drill is with 1 , the drill bit axis with A and the drill bit with BS. Between the individual cylinder-like sections a1, a2, a3,... A14 of different diameters are conically formed transition areas ü1, ü2, ü3,... Ü14 with the cutting edges s1, s2, s3,... S14. The flute which treats the cylinder-like sections a1, a2, a3,... A14 and the transitional areas .alpha.1, .tau.2, .times.3,..., 14 is denoted by S.

The Spannut has an imaginary chip-groove baseline at the flute bottom G up.

to Explanation of the chip-groove baseline G is noted that the Flute S in a cross-sectional view perpendicular to the drill axis A lying sectional plane each having a point, which of the Drill axis A is closest. Become for all cutting planes connecting all these points together results in the chip-groove baseline G. It runs helically like the flute S. around the drill axis A on an imaginary cone surface.

The pitch angle w of this span-groove baseline is defined as follows:
The pitch angle w in a lying on this chip-groove baseline G point P is formed between the running through this point P imaginary tangent T on the chip-groove base line G and the imaginary passing through this point P parallel PA to the rotation axis A. .
According to the invention, the pitch angle w of the chip groove S remains from the cylinder-like section to the cylinder-like section a1 / a2, a2 / a3, a3 / a4, ... or from transition area to transitional area ü1 / ü2, ü2 / ü3; ü3 / ü4, ... equal to or deviates only slightly with a maximum of plus / minus 3 degrees.

hereby improved chip removal during the drilling process is guaranteed.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 20318529 U [0002]

Claims (1)

Multi-stage drills ( 1 ) for drilling bores of different diameters with an axis of rotation (A) on demand, with a drill point (BS), with a plurality of cylinder-like sections (a1, a2, a3, ... a14) of different diameter, each having a chip-groove edge, with conically formed transitional areas (ü1, ü2, ü3, ... ü14) each having a cutting edge (s1, s2, s3, ... s14) between the cylinder-like sections, and at least one helical spline cutting the cylinder-like sections and the transition areas. Groove (S), wherein the chip groove (S) has an imaginary chip-groove base line (G) on the chip-groove bottom, which runs helically around the axis of rotation (A), wherein the lead angle (w) of the chip Groove baseline (G) in a point (P) lying on this chip-groove baseline (G) between the imaginary tangent (T) passing through this point (P) at the spline-groove baseline (G) and the imaginary one passing through this point (P) par alleles (PA) to the axis of rotation (A) is formed, characterized in that the pitch angle (w) of the chip groove (S) from cylinder-like section to cylinder-like section (a1 / a2, a2 / a3, a3 / a4, ... ) or from transition region to transition region (ü1 / ü2, ü2 / ü3, ü3 / ü4 ...) remains the same or deviates only slightly with a maximum of plus / minus 3 degrees.