WO2012139542A2 - Outil de perçage à plusieurs tranchants - Google Patents

Outil de perçage à plusieurs tranchants Download PDF

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Publication number
WO2012139542A2
WO2012139542A2 PCT/DE2012/000236 DE2012000236W WO2012139542A2 WO 2012139542 A2 WO2012139542 A2 WO 2012139542A2 DE 2012000236 W DE2012000236 W DE 2012000236W WO 2012139542 A2 WO2012139542 A2 WO 2012139542A2
Authority
WO
WIPO (PCT)
Prior art keywords
drilling tool
tool according
cutting edge
main cutting
angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2012/000236
Other languages
German (de)
English (en)
Other versions
WO2012139542A3 (fr
Inventor
Manfred Schwenck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guehring KG
Original Assignee
Guehring KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guehring KG filed Critical Guehring KG
Publication of WO2012139542A2 publication Critical patent/WO2012139542A2/fr
Publication of WO2012139542A3 publication Critical patent/WO2012139542A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges

Definitions

  • the invention relates to a multi-bladed, in particular double-edged
  • Drilling tool for drilling in full according to the preamble of claim 1.
  • Drilling tools of this type are indispensable in modern production technology. They have taken an enormous development in terms of tool life and working accuracy in recent decades. Due to the more and more accurate and stable working machine tools, it is also possible to produce highly complex polished sections reproducible, even if the material of the drilling tool from the group of
  • Hard materials such as. As the hard metals (VHM) is selected.
  • a particular challenge for such drilling tools is the machining of high-strength and tough materials, such.
  • tempered steels C70 and 42CrMo4 or of heat-resistant alloys, such as.
  • nickel-chromium alloy INCONEL 718 there are already various attempts have been made to design a tool of the type described above in such a way that can be achieved with controllable spindle loads a good service life.
  • a point grind according to the preamble of claim 1 is already described, for example, in the DIN 1412 form A or DIN 1312 form B.
  • the sharpening is made in such a way that at the same time a correction is a main cutting edge.
  • the continuously increasing with decreasing distance to the drill axis clearance angle is obtained according to this bevel geometry in that a so-called Kegelmantelanschliff is attached, i. that the free surface is formed by the shell portion of a cone whose axis is parallel to a plane substantially parallel to the main cutting edge and perpendicular to the plane
  • Drill axis runs, however, lies to a certain extent in front of the main cutting edge.
  • Tool coatings on the one hand and the recently improved lubrication / cooling technology, including the so-called minimum lubrication (MQL technology), make it possible to considerably reduce the cross sections of the flutes even in tools for drilling into the solid, which leads to an increase in the core diameter.
  • MQL technology minimum lubrication
  • the peculiarity of the bevel according to DE 10 2009 025 223 A1 consists of subdividing the center cutting edge formed by the sharpening into two sub-cutting edges which enclose an obtuse angle with each other.
  • Eigenzentrier s the bevel in the central area designed so that in the
  • the drilling tool according to DE 10 2007 040 178 A1 is designed with regard to the top grinding, so that a better Chipabpound in the center of
  • Drilling tool results. This is achieved by the rake surfaces of the
  • Main cutting and the rake surfaces of the center cutting are arranged at an obtuse angle to each other and that the free surfaces have portions which are arranged at an obtuse angle to each other, wherein these
  • Subsections are assigned to both the rake face of the center cutting and the rake face of the main cutting edge.
  • the invention is therefore the object of developing a multi-bladed, in particular double-edged drilling tool for drilling in full according to the preamble of claim 1 in such a way that is reasonable
  • Drilling tool significantly depends on the size of the normal clearance angle on the cutting corner. While it has been assumed that the clearance angle in
  • Center of the drilling tool should have a size in the range of about 15 °, so that it can still be held at the cutting corner in the order of about 0 °, the clearance angle is substantially reduced over the entire length of the cutting edge according to the invention.
  • Wear widths allow as conventional designed drilling tools, without causing a tool break or impermissible diameter deviations of the bore produced.
  • the clearance angle of the main cutting edge from the cutting edge to the Cutting center relatively strong, for example, increases from 8 ° outside to 14 ° inside, it was found that the bevel invention to a 50%
  • reduced normal clearance angle in the region of the cutting center has the consequence that there is also more material for dissipating the frictional heat
  • Fine adjustment of the cutting behavior created when processing different materials with correspondingly different chip formation Fine adjustment of the cutting behavior created when processing different materials with correspondingly different chip formation.
  • the geometry of the first free surface is characterized, inter alia, by the fact that the normal clearance angle of the main cutting edge does not change with increasing distance to the drill axis. This can be ensured to a good approximation by a flatêtnanschliff but for example also by the fact that the first free surface of a suitable, lightweight
  • the grinding kinematics can be kept simple.
  • the invention has particular advantages when the bevel is attached to a very rigid tool, as is the case, for example, with a tool made of solid carbide (VHM). It got beyond that Shown that the polished section according to the invention has particular advantages, especially when drilling tools with extremely enlarged core diameter are equipped with this bevel. It could be shown in experiments that the positive state effects explained at the beginning show themselves even if the
  • Core diameter is raised to ranges between 0, 30 and 0.45 x D, where D denotes the nominal diameter of the drilling tool.
  • the advantages of the bevel invention are then further increased when the drilling tool is equipped with internal cooling channels. It is advantageous in this case, when the cooling channels each open into the second open space, whereby the mouth of the cooling channel receives a greater distance to the bottom of the hole. This will effectively direct the coolant / lubricant to the engaged cutting edge of the tool, including the chisel edge.
  • This design is advantageous both when using liquid coolants / lubricants and when the tool is used for so-called dry machining, i. used for MQL (minimum quantity lubrication) technology. This effect can be further optimized in that the mouth openings according to claim 11
  • the center cutting edge is additionally stabilized.
  • FIG. 1 is a plan view of the drilling tool according to the invention
  • FIG. 2 shows a side view of the tip region of the drilling tool shown in FIG. 1 in a viewing direction according to "II" in FIG. 1;
  • FIG. 1 is a plan view of the drilling tool according to the invention
  • FIG. 3 shows a view of the tool according to FIG. 1 in a viewing direction along "III" in FIG. 1;
  • FIG. 4 is a partial view of the tool of FIG. 2 looking along "IV" in FIG. 2, i. along the main cutting edge;
  • FIG. 5 shows an enlarged view of the detail "X" of FIG. 1;
  • FIG. 6 in an enlarged view the detail ⁇ "of FIG. 2;
  • FIG. 7 shows a side view of the drilling tool in a viewing direction according to "VII" in FIG. 1;
  • Fig. 8 is a view of the drilling tool in a viewing direction parallel to a
  • FIG. 9 is a diagram showing the measurement results of drilling tests, the tool life of a tool according to the invention with those of a
  • Fig. 1 shows the front view of a double-edged drilling tool 10, the two
  • the drilling tool 10 is a tool for drilling into the solid, i. around a tool that is equipped with a Spitzenanschliff, one running to near the center
  • the polished section is point-symmetrical, i. the edges and surfaces formed by the bevel are point symmetrical to the center 15 of the drilling tool.
  • the polished section is essentially formed by three surfaces, namely a first main relief surface 18A, an adjoining second main relief surface 18B and a core recess 24, which - as best shown in the illustration according to FIG. 5 - can be brought close to the center 15 reaches the drilling tool.
  • the extent to which the Kernausspitzung 24 ends before the center or in front of the center of the drilling tool is designated in Fig. 5 with KVM.
  • the measure is for a drilling tool with a nominal diameter of about 7 mm between 0.00 and 0.04 mm.
  • the reference numeral 16 denotes internal cooling channels which extend in the webs of the drilling tool to the chip portion of the drilling tool, not shown, and are positioned with respect to the Spitzenanschliffs such that the
  • Mouth openings in the region of the second main free surface 18B are. As further shown in the illustrations according to FIGS. 1 and 5, the mouth openings in the second main free surface 18 B are ground free, so that a channel 26 of the
  • the term WSP designates the tip angle of the drilling tool, ie the angle which the two main cutting edges 12, 12A enclose with each other.
  • this point angle is about 140 °.
  • Advantageous point angles are in the range between 120 and 150 °, preferably between 135 and 145 °.
  • a cutting portion 12A is formed in the drill core by the Kernausspitzung 24, but at the same time the main cutting edge 12 is slightly corrected.
  • a transition radius RB is ground, which in the case of the tool having a nominal diameter of about 7 mm, is in the range of about 1.5 to 1.6 mm.
  • Kernausspitzung 24 The situation of Kernausspitzung 24 is described in more detail below:
  • the Kernausspitzung 24 is ground by a grinding wheel, the cross section in the region of its working edge of Fig. 8 can be seen.
  • Corner angle WEC (see FIG. 8) is between 100 and 110 °, for example 105 ⁇ 0.1 °.
  • RK the edge radius of the grinding wheel is designated, which in a
  • Ausspitzungs sampling 24F forms.
  • the value of this edge radius RK is preferably in the range between 0.1 and 0.2 mm.
  • the plunging movement of the grinding wheel for producing the Kernausspitzung 24 is set so that in the region of the cutting breast portion 24 B - apparent from Fig. 3 - slightly negative axial rake angle WSAK results, which is in the range between 0 and 2 °.
  • the edge 34 is located by the amount MVM in front of the cutting edge 12A.
  • the dipping motion of the grinding wheel is set so that the edge radius RK between the cutting face 24B and the tapering face 24F produces a dishing edge 34 inclined by the inclination angle WN to the drill axis 30.
  • the inclination angle WN ( Figure 7) is in the range between 30 and 40 °, preferably between 33 and 37 °.
  • the grinding wheel is moved and aligned such that, viewed in a plane perpendicular to the drill axis 30, the cutting breast portion 24B in FIG an angle WK (see Figure 5) in the range between 25 and 35 °, preferably between 28 and 32 ° to a plane ER (see Figures 1 and 5), which passes through the center 15 of the drilling tool and parallel to a radially outer region the main cutting edge 12 is aligned.
  • This angle determines the kink of the
  • the reference numeral 28 denotes a secondary cutting edge, behind which adjoins the auxiliary flank 32.
  • the cutting corner 36 is provided with a chamfer having a width BFA in the range between 0.05 and 0, 15 mm has.
  • the chamfer on the cutting corner 36 is also slightly undercut, which results - according to FIG. 6 - by the angle WHS.
  • the angle WHS is preferably between 9 and 1 1 °.
  • the chamfering of the cutting corner 36 is also set to include an angle WAS between 40 and 50 ° with the drill axis.
  • Fig. 6 shows that both the main cutting edge 12 and the secondary cutting edge 28 are chamfered or broken, which can be done for example by brushing by hand.
  • the chamfer width BFH at the main cutting edge 12 is for example in the range between 0.04 and 0.08 mm.
  • the main cutting edge 12 is a measure KVM "before center", i. in the direction of rotation of the drilling tool offset to a radial plane ER of the drilling tool, which is substantially parallel to
  • Main cutting portion 12 extends. In this radial plane ER beyond an edge 20, at which the first main free surface 18A and the second main free surface 18B touch.
  • MAM denotes a dimension about which the drill axis is offset from the center of the residual cross-cutting edge 22R formed by the main relief surfaces 18A, 18B (see FIG. 5). This dimension MAM is extremely small and is on the order of 0.01 to 0.018 mm. It results, for example, in that the
  • Main cutting edges 12, 12A are ground with a small cutting height difference, for example, on the order of 0.02 mm, so that the blades differ slightly in length from each other.
  • the drilling tool according to the invention was designed in view of the fact that a particularly high wear resistance and a significantly increased service life are provided. According to the invention, it has been found that, contrary to all expectations, a considerable improvement in the stability (in accordance with DIN 6583) when machining high-strength and / or high-strength and / or particularly heat-resistant steels results when the normal clearance angle of the main cutting edge over the entire length of the main cutting edge, ie also in the area of Kernausspitzung 24 is considerably smaller than usual and kept substantially the same. This will be described below with reference to FIGS. 2 to 4 will be explained in more detail.
  • Fig. 4 is the view of the bevel when viewed in the direction of the main cutting edge 12.
  • the drawing plane of Fig. 4 is accordingly the plane in which the normal clearance angle WNF of the main cutting edge 12 is measured.
  • the normal clearance angle NWF1 of the first main free surface is selected in the range between 7 and 11 °, preferably between 8 and 10 °, and it remains substantially equal over the entire length of the skin cutting edge.
  • the normal clearance angle NWF2 of the second main relief surface 18B is substantially larger and is for example in the range between 18 ° and 22 °.
  • the main cutting edge 12 is chamfered in the region of the edges to a chamfer angle F12, wherein the angle can be in the range between 20 and 30 °.
  • VHM Solid carbide drilling tools were produced with a carbide grade DK 460 UF from Glick OHG. The hardness of this material is 1620 (HV 30). The composition is 90% tungsten carbide and 10% cobalt. The grain size was on the order of less than 0.5 ⁇ m.
  • Bending strength of this carbide grade is 3700 N / mm 2 .
  • the drills were coated with a multi-layered layer of titanium aluminum nitride and
  • Equipped titanium nitride All drilling tools were equipped with internal coolant / lubricant channels.
  • the bevel was in accordance with the Fign. 1 to 8 executed. Accordingly, the normal clearance angle NWF1 was 8 ° over the entire length of the main cutting edge.
  • the drilling tool with a nominal diameter of 6.8 mm was equipped with a
  • MMS technology minimum quantity lubrication
  • the tool breakage and the breakout of the main cutting edge were determined.
  • the comparison tool was equipped with a first main face 18A, where the normal relief angle of the first main face was 8 ° in the radially outer area and 14 ° in the inner area of the main point near the drill center.
  • the column V1 shows the tool life of the comparison tool with a normal clearance angle NWF1 between 8 ° outside and 14 ° inside.
  • the column E forms the tool life for the tool according to the invention with the four-surface bevel.
  • Comparative tool V1 a tool life of only 76 m, for the tool according to the invention a tool life of 115 m. This result is surprising, since both the feed force and the required torque in the inventive tool is expected to be higher than the comparison tool V1. Nevertheless, the tool according to the invention tolerates the larger mechanical
  • the tool was described as a tool that consists of a tough and solid material, such as. B. made of solid carbide (VHM). However, it is
  • the drilling tool made of a different material such. B. from tool steel, especially HSS, HSSE or another hard material such. B. produce a cermet material.
  • the tool from high-speed steel and equip it with a hard-material cutting insert, which forms only the two main cutting edges, the transverse cutting edge and the edge 20 lying between the main relief surfaces.
  • Coatings in particular to provide hard coatings or soft coatings.
  • the invention thus provides a multi-bladed, in particular double-edged drilling tool for drilling into the solid, in which the main cutting edge, which is preferably located in front of the center, merges into a cutting edge of a core recess located in front of the center.
  • the peculiarity is that the normal cutting angle WNF1 of the main cutting edge remains essentially the same over its entire length, including the region of the core recess, preferably in the range between 7 and 11 °, most preferably between 8 and 10 °.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un outil de perçage à plusieurs tranchants, en particulier à deux tranchants, servant au perçage dans la masse, dont le tranchant principal (12) placé de préférence avant le centre prend la forme dans un bord de coupe (12A) d'un effilement central (24) placé avant le centre. L'outil est caractérisé en ce que l'angle de liberté normal (WNF1) du tranchant principal (12, 12A) reste sensiblement uniforme sur toute sa longueur y compris dans la zone (12A) de l'effilement central (2A), et se situe dans une plage comprise de préférence entre 7° et 11°, et de préférence encore entre 8 et 10°.
PCT/DE2012/000236 2011-03-09 2012-03-09 Outil de perçage à plusieurs tranchants Ceased WO2012139542A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011001178.1 2011-03-09
DE201110001178 DE102011001178A1 (de) 2011-03-09 2011-03-09 Mehrschneidiges Bohrwerkzeug

Publications (2)

Publication Number Publication Date
WO2012139542A2 true WO2012139542A2 (fr) 2012-10-18
WO2012139542A3 WO2012139542A3 (fr) 2012-12-20

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Application Number Title Priority Date Filing Date
PCT/DE2012/000236 Ceased WO2012139542A2 (fr) 2011-03-09 2012-03-09 Outil de perçage à plusieurs tranchants

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DE (1) DE102011001178A1 (fr)
WO (1) WO2012139542A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180065190A1 (en) * 2015-03-23 2018-03-08 Walter Ag Drill bit for drilling laminates

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013201062B4 (de) * 2013-01-23 2018-09-13 Kennametal Inc. Bohrspitze

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1230058B1 (fr) 1999-11-16 2003-10-22 Kennametal Inc. Meche et procede d'affutage d'une meche
DE102007040178A1 (de) 2007-08-25 2009-02-26 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Bohrer
DE102008004564A1 (de) 2008-01-15 2009-07-23 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Bohrwerkzeug mit Ausspitzung
DE102009025223A1 (de) 2009-06-08 2010-12-09 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Bohrer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936658A (en) * 1956-08-08 1960-05-17 Oscar L Riley Twist drill
FR2793176B1 (fr) * 1999-05-05 2001-06-08 Tivoly S A Foret helicoidal a trous d'huile
CA2731128C (fr) * 2008-06-28 2016-11-08 Guhring Ohg Outil de percage a aretes coupantes multiples
SE536296C2 (sv) * 2011-02-08 2013-08-06 Sandvik Intellectual Property Borr med spånkanaler utformade för förbättrad spånevakuering

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1230058B1 (fr) 1999-11-16 2003-10-22 Kennametal Inc. Meche et procede d'affutage d'une meche
DE102007040178A1 (de) 2007-08-25 2009-02-26 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Bohrer
DE102008004564A1 (de) 2008-01-15 2009-07-23 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Bohrwerkzeug mit Ausspitzung
DE102009025223A1 (de) 2009-06-08 2010-12-09 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Bohrer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180065190A1 (en) * 2015-03-23 2018-03-08 Walter Ag Drill bit for drilling laminates
US10183343B2 (en) * 2015-03-23 2019-01-22 Walter Ag Drill bit for drilling laminates

Also Published As

Publication number Publication date
DE102011001178A1 (de) 2012-09-13
WO2012139542A3 (fr) 2012-12-20

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