WO2020002581A1 - Foret étagé - Google Patents

Foret étagé Download PDF

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Publication number
WO2020002581A1
WO2020002581A1 PCT/EP2019/067302 EP2019067302W WO2020002581A1 WO 2020002581 A1 WO2020002581 A1 WO 2020002581A1 EP 2019067302 W EP2019067302 W EP 2019067302W WO 2020002581 A1 WO2020002581 A1 WO 2020002581A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting edge
longitudinal axis
radial distance
boring
area
Prior art date
Application number
PCT/EP2019/067302
Other languages
German (de)
English (en)
Inventor
David ONDRA
Oezkan YILDIRIM
Dennis MAI
Daniel HOECK
Original Assignee
Ruko Gmbh Praezisionswerkzeuge
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 Ruko Gmbh Praezisionswerkzeuge filed Critical Ruko Gmbh Praezisionswerkzeuge
Priority to DE112019003181.3T priority Critical patent/DE112019003181A5/de
Publication of WO2020002581A1 publication Critical patent/WO2020002581A1/fr

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/009Stepped drills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/04Angles, e.g. cutting angles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/04Angles, e.g. cutting angles
    • B23B2251/043Helix angles
    • B23B2251/046Variable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/08Side or plan views of cutting edges
    • B23B2251/082Curved cutting edges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/14Configuration of the cutting part, i.e. the main cutting edges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/40Flutes, i.e. chip conveying grooves
    • B23B2251/408Spiral grooves

Definitions

  • the invention relates to a step drill specified in the preamble of claim 1.
  • Step drills of the type mentioned here are known and are used, for example, for drilling holes in thin sheet materials.
  • the stepped design of the drill allows holes of different diameters to be drilled into a workpiece with a single tool, without the need for unnecessary time being spent on clamping and clamping a new tool.
  • the known step drills have, inter alia, a drill tip with a number of geometrically defined cutting edges and at least one larger outside diameter than that
  • Drilling tip with drill bit which also comprises a number of cutting edges.
  • the cutting edges of both the drill bit and the at least one boring stage are assigned flutes which serve to remove the chips removed from the cutting edges of the drill tip or the cutting edges of the boring stage, which occur when using the step drill, i.e. when machining a workpiece.
  • a safe and low-friction removal of the chips is a prerequisite for the safe function of the step drill.
  • the cutting speeds of the cutting edges of the drill tip and the at least one boring step differ due to the
  • the geometry of the step drill in particular the geometry of the cutting edges and flutes, is of crucial importance for safe chip formation and chip removal.
  • Step drills are realized in different embodiments, namely as so-called
  • Multi-chamfer step drill i.e. as a step drill, in which both the cutting of the drill tip and the cutting edges of the boring step also have their own flutes, as well as simple step drills.
  • the invention relates primarily to simple step drills.
  • Longitudinal axis revolves in several parallel planes oriented perpendicular to the longitudinal axis, i.e. the boring stage is rotationally symmetrical except for the flutes.
  • the known simple step drills have a distal end and a proximal end located away therefrom.
  • a drill tip is provided at the distal end.
  • the drill tip is provided with a tip at the distal end of the step drill and has a number of geometrically defined cutting edges, each of which is assigned a flute.
  • the cutting edges each run over a first cutting area and form a main cutting edge and an adjoining secondary cutting edge.
  • the radial distance from the longitudinal axis of the step drill to the main cutting edge increases linearly in a first radial distance range in the direction of the proximal end. In a second radial distance range, the radial distance from the longitudinal axis to the minor cutting edge is less than or equal to the maximum distance of the first radial distance range.
  • the drill tip is followed by at least one first boring step, which is arranged at a distance from the distal end and also has a number of geometrically defined cutting edges, each of which is assigned one of the flutes.
  • the cutting edges each run over a second cutting area.
  • the second cutting area is formed by a main cutting edge and an adjoining secondary cutting edge of the boring step. The radial distance from the
  • the longitudinal axis to the main cutting edge increases linearly in a third radial distance region in the direction of the proximal end.
  • the radial distance from the longitudinal axis to the minor cutting edge is less than or equal to the maximum distance of the third radial distance range.
  • the first maximum distance from the longitudinal axis to the main cutting edge of the first area is smaller than the maximum distance from the longitudinal axis to the main cutting edge of the second area.
  • Step drill can be clamped in a drill chuck of a drill.
  • a disadvantage of the known step drills is the relatively short service life of the step drills, but also the uneven drilling behavior during drilling into the workpiece to be machined.
  • the step drill may get caught in the workpiece to be machined, and thus the step drill may fail due to the excessive torques resulting therefrom. For example, when using the step drill in hand-operated machines, snagging can occur
  • WO 2008/092386 A1 discloses a step drill of the generic type, in which the main cutting edge of a boring step of a cutting area from the smallest radial distance from the longitudinal axis to the main sheath to the greatest radial distance from the longitudinal axis
  • Main cutting edge has a continuous curvature. However, only one flute is provided.
  • US 2008/0166195 A1 discloses a step drill with helical boring steps, with likewise curved cutting areas.
  • the invention has for its object a step drill according to the preamble of
  • Claim 1 specified type in such a way that, while avoiding the disadvantages mentioned, the tool life increases, the bore quality is improved and a quieter drilling behavior is achieved.
  • the invention is based on the finding that by optimizing the contour of the
  • Main cutting edge of a boring stage can easily increase the tool life and improve the drilling behavior during drilling, with such an optimization by
  • the main cutting edge of a boring step of a region from the smallest radial distance from the longitudinal axis to the main cutting edge to the largest radial distance from the longitudinal axis to the main cutting edge has a continuous curvature which is uniform over its course and has a predetermined pitch circle with a longitudinal section Cutting edge radius forms. This even curvature of the main cutting edge ensures that the tool life increases and the drilling behavior becomes quieter when drilling.
  • the cutting radius is preferably in a range from 0.5 mm to 3 mm inclusive.
  • the area of application is simply increased by several boring stages, the maximum radial distance from the longitudinal axis to the main cutting edge of the boring stage closer to the distal end being smaller than the maximum radial distance from the longitudinal axis to the main cutting edge of the subsequent boring stage.
  • the advantages mentioned are also achieved with several boring stages in each boring stage, since each preliminary boring stage has a curvature of the main cutting edge and the optimization according to the invention is effective in each further boring stage.
  • the cutting edge radii of the individual boring stages are of identical design. Regardless of the diameter to be drilled, the cutting radius is the same, which not only simplifies the manufacture of the step drills, but also improves the drilling behavior during operation. The drilling behavior is therefore dependent on the curvature, in particular the uniform curvature and thus on the cutting edge radius.
  • the flutes to the cutting edges preferably have a rake angle of 5 ° to 10 °. This is therefore much smaller than the rake angles of 10 ° to 17 ° of the known step drills that have been common up to now. Tests have shown that in combination with the continuous curvature of the main cutting edges, a further improved cutting behavior of the step drill according to the invention can be produced.
  • the radial distance from the longitudinal axis to the main cutting edge in particular decreases in the circumferential direction to the next flute, in particular in a range from 0.05 mm to 0.5 mm. This ensures that chip formation in all cases takes place through the main cutting edge and possible frictional resistances in the direction of rotation and in the feed direction are avoided or at least largely reduced.
  • the radial distance from the longitudinal axis to the secondary cutting edge also decreases in the circumferential direction to the next flute, in particular in a range from 0.05 to 0.5 mm.
  • the radial distance from the longitudinal axis to the minor cutting edge decreases starting from the main cutting edge along the minor cutting edge in the direction of the proximal end, in particular at an angle of 0.5 ° to 4 ° inclusive to the longitudinal axis or an axis parallel to the longitudinal axis.
  • the flute runs spiraling from the distal end in the direction of the proximal end around the longitudinal axis of the drill bit, starting from the drill tip through the at least first drilling step or subsequent drilling step or following drilling steps step drill.
  • Each boring stage thus has a main cutting edge assigned to a flute and a secondary cutting edge.
  • the slope of the flute or flutes is preferably the largest from the tip
  • the tip of the drill tip has a double-edged tip.
  • the distance from the drill tip to the first boring step or the distance from the boring step closer to the distal end to the next following boring step is the same in each case and this distance forms the step length.
  • the step length can be greater than or equal to 2 mm, in particular greater than or equal to 4 mm.
  • the step length includes the major cutting edge and the minor cutting edge.
  • the step drill according to the invention is preferably used in hand-guided
  • Drills since they are particularly dependent on quiet drilling behavior - no rattling.
  • Each boring step runs all around the longitudinal axis in planes perpendicular to the longitudinal axis.
  • the boring steps are therefore not coiled.
  • Figure 1 a is a side view of a step drill according to the invention.
  • Fig. 1 b is an enlarged detail view of the area marked with the circle A in Fig. 1 a
  • FIG. 2 is an enlarged detail view from the side of the front area of the step drill of FIG. 1a;
  • FIG. 3a shows a view of the step drill from FIG. 1a from below;
  • 3b is an enlarged detail view of the area of the area marked with the circle H in FIG. 3a
  • Fig. 4 is a side view as in Fig. 1 a with the representation of the spiral angle.
  • FIGS. 1 to 4 show an example of a step drill 10 with a distal end 12 and a proximal end 14 located distant from it.
  • the step drill 10 is provided with a drill tip 16 and with eight boring steps 18 to 32 adjoining it in the direction of the proximal end 14.
  • the drill tip 16 has a tip 34 at the distal end.
  • a number of geometrically defined cutting edges are provided at the tip 34 of the drill tip 16.
  • the drill tip 16 has two main cutting edges 16a and two secondary cutting edges 16b. Each major cutting edge 16a and minor cutting edge 16b is assigned to a flute 36 or 38. Two mutually corresponding flutes 36, 38 are thus provided.
  • the flute 36, 38 serves primarily to remove chips removed from the main cutting edge 16a.
  • the flute 36, 38 extends continuously from the distal end 12 of the drill tip 16 with an increasing gradient from the tip 34 in the direction of the proximal end 14 and thus an increasing spiral angle to beyond the last boring step 32 into an end piece 40
  • End piece 40 is followed by a regionally cylindrical shank 42, in which three surfaces 42a are introduced in the shank 42, each offset 120 ° to one another in the longitudinal direction.
  • the configuration of the 3 flat shank of drills, also of step drills, with such a shank 42 is known, so that it is not discussed in more detail here.
  • Each boring stage 18 to 32 has cutting edges formed by the flutes 36 and 38, that is to say the boring stage 18 has two main cutting edges 18a and two secondary cutting edges 18b
  • Boring stage 20 has two main cutting edges 20a and two secondary cutting edges 20b
  • drilling stage 22 has two main cutting edges 22a and two secondary cutting edges 22b
  • drilling stage 24 has two main cutting edges 24a and two secondary cutting edges 24b
  • drilling stage 26 has two
  • the boring step 30 has two
  • Main cutting edges 30a and a secondary cutting edge 30b, and the boring step 32 has one
  • Main cutting edge 32a and two secondary cutting edges 32b are Main cutting edge 32a and two secondary cutting edges 32b.
  • the one main cutting edge 16a and the adjoining secondary cutting edge 16b together form a first cutting area 16c.
  • the first cutting area 16c is divided into a first radial distance area 16d and a second radial distance area 16e.
  • the first radial spacing area 16d comprises the main cutting edge 16a and the second radial spacing area 16e comprises the minor cutting edge 16b.
  • the radial distance from a longitudinal axis 44 of the step drill 10 to the main cutting edge 16a lies in the first radial distance region 16d and increases linearly from the distal end 12 in the direction of the proximal end 14.
  • the radial distance from the longitudinal axis 44 to the secondary cutting edge 16b is the same at the distal end of the secondary cutting edge 16b and is smaller in the direction of the proximal end 14 than the maximum distance of the first radial distance region 16d.
  • the first boring stage 18 adjoins the drill tip 16.
  • the main cutting edge 18a of the first boring stage 18 immediately adjoins the secondary cutting edge 16b of the preceding drill tip 16.
  • the one main cutting edge 18a and the adjoining secondary cutting edge 18b of the first boring step 18 together form a second cutting edge area 18c.
  • the second Cutting area 18c is divided into a third radial distance area 18d and a fourth radial distance area 18e.
  • the third radial spacing area 18d comprises the main cutting edge 18a and the fourth radial spacing area 18e comprises the minor cutting edge 18b.
  • the radial distance from the longitudinal axis 44 of the step drill 10 to the main cutting edge 18a increases from the smallest radial distance from the longitudinal axis 44 to the main cutting edge 8a in the direction of the greatest radial distance from the longitudinal axis 44 to the main cutting edge 18a in such a way that the main cutting edge 18a is uniform Has curvature.
  • the main cutting edge 18a forms a predetermined pitch circle with a cutting edge radius Ri.
  • the radial distance from the longitudinal axis 44 to the secondary cutting edge 18b is initially almost the same for the main cutting edge 18a and is smaller in the direction of the proximal end 14 of the secondary cutting edge 18b than the maximum distance from the longitudinal axis 44 to the main cutting edge 18a.
  • the maximum distance from the main cutting edge 16a of the longitudinal edge 44 of the drill tip 16 is smaller than the maximum distance from the longitudinal axis 44 to the main cutting edge 18a of the first boring step 18 of the second cutting area 18c.
  • the main cutting edge 18a essentially describes the radial enlargement of the first boring stage 18, that is to say not completely. This results from the fact that the previous minor cutting edge 16b of the drill tip 16 has an undercut, which will be discussed later.
  • the second boring stage 20 is connected to the first boring stage 18.
  • the main cutting edge 20a of the first boring stage 20 immediately adjoins the secondary cutting edge 18b of the preceding first boring stage 18.
  • the third cutting edge region 20c is divided into a fifth radial spacing region 20d and a sixth radial spacing region 20e.
  • the first fifth spacing area 20d comprises the main cutting edge 20a and the sixth radial spacing area 20e comprises the
  • Main cutting edge 20a increases from the smallest radial distance from the longitudinal axis 44 to the main cutting edge 20a in the direction of the largest radial distance from the longitudinal axis 44
  • Main cutting edge 20a so that the main cutting edge 20a has a uniform curvature.
  • the main cutting edge 20a forms a predetermined pitch circle with a
  • Cutting edge radius R 2 The radial distance from the longitudinal axis 44 to the secondary cutting edge 20b is initially almost the same for the main cutting edge 20a and is in the direction of the proximal end 14
  • Minor cutting edge 20b smaller than the maximum distance from the longitudinal axis 44 to the main cutting edge 20a.
  • the maximum distance from the main cutting edge 18a of the longitudinal axis 44 of the first boring stage 18 is smaller than the maximum distance from the longitudinal axis 44 to the main cutting edge 20a of the second Boring step 20 of the second cutting area 20c.
  • the main cutting edge 20a describes in
  • the third boring stage 20 is followed by the third boring stage 22 with a fourth cutting edge region 22c, a seventh radial spacing region 22d, an eighth radial spacing region 22e and a cutting edge radius R 3 .
  • the third boring stage 22 is designed in accordance with the first boring stage 18 and the second boring stage 20. Only the radial spacing ranges are correspondingly larger, so that the radius of the borehole in the workpiece to be machined is increased during the drilling step for each step.
  • the fourth boring stage 24 has a fifth cutting edge area 24c, a ninth radial spacing area 24d, a tenth radial spacing area 24e and a cutting edge radius R 4 .
  • the fourth boring stage 24 is designed in accordance with the previous boring stages 18, 20, 22. Only the radial distance ranges are correspondingly larger, so that when drilling from boring step to boring step the radius of the borehole in the workpiece to be machined is increased.
  • the fifth boring stage 26 has a sixth cutting edge region 26c, an eleventh radial spacing region 26d, a twelfth radial spacing region 26e and a cutting edge radius R5.
  • the fifth boring stage 26 is designed in accordance with the previous boring stages 18, 20, 22, 24. Only the radial distance ranges are correspondingly larger, so that when drilling from boring step to boring step the radius of the borehole in the workpiece to be machined is increased.
  • the sixth boring stage 28 has a seventh cutting edge region 26c, a thirteenth radial spacing region 28d, a fourteenth radial spacing region 28e and a cutting edge radius R6.
  • the sixth boring stage 28 is designed in accordance with the previous boring stages 18, 20, 22, 24, 26. Only the radial distance ranges are correspondingly larger, so that when drilling from boring step to boring step the radius of the borehole in the workpiece to be machined is increased.
  • the seventh boring stage 30 has an eighth cutting area 30c, a fifteenth radial distance area 30d, a sixteenth radial distance area 30e and one
  • the seventh boring stage 30 is designed in accordance with the previous boring stages 18, 20, 22, 24, 26, 28. Only the radial distance ranges are correspondingly larger, so that when drilling from boring step to boring step the radius of the borehole in the workpiece to be machined is increased.
  • the eighth and last boring stage 32 has a ninth cutting area 32c, a seventeenth radial spacing area 32d, an eighteenth radial spacing area 32e and a cutting edge radius Rs.
  • the eighth boring stage 32 is designed in accordance with the previous boring stages 18, 20, 22, 24, 26, 28, 30. Only the radial distance ranges are correspondingly larger, so that when drilling from boring step to boring step the radius of the borehole in the workpiece to be machined is increased.
  • the cutting radii Ri-s are the same in each case and, depending on the step drill 10, lie between
  • the flutes have the same rake angle throughout, which is in a range of 5 ° to 10 ° inclusive, see FIGS. 3a and 3b.
  • the radial distance from the longitudinal axis 44 to the main cutting edge 16a to 32a decreases in the circumferential direction to the next flute 38, namely a range from 0.05 mm to 0.5 mm. This ensures that the chip formation in all cases takes place through the main cutting edge 16a to 32a and possible frictional resistance in the direction of rotation and in the feed direction are avoided.
  • the tip 34 of the drill tip 36 has a double-edged point grinding, namely two main cutting edges 16a, which are each assigned to a flute 36, 38.
  • the distance from the drill tip 16 to the first boring stage 18, from the first boring stage 18 to the second boring stage 20, etc. is the same in each case. This distance forms the step length.
  • the step length is greater than or equal to 2 mm.
  • the step drill 10 according to the invention is preferably used in hand-held drills and is particularly suitable for drilling workpieces made of structural steel, stainless steel, plexiglass, wood, plastic and the like.
  • the optimized cutting edge geometry ensures ideal chip and heat dissipation.
  • the optimized cutting edge geometry ensures very smooth running behavior.
  • the inventive design improves the surface quality and the roundness of the bore and reduces the formation of burrs on the edges. Due to the extremely reduced heat development, the service life of the step drill 10 is decisively improved. The service life is increased up to four times.
  • the specially continuous curve of the main cutting edges 18a to 32a ensures smooth transitions between the individual boring stages 18 to 32. This allows the radial forces during the drilling process to be reduced by up to 80%.
  • the described relief grinding of each boring stage 18 to 32 prevents the cutting area 18c to 32c from breaking out or getting caught in the workpiece during the drilling process.
  • step drill 10 shown as an example, there are also a large number of step drills with different step diameters and number of boring steps 8, 20, 22, 24, 26, 28, 30, 32. LIST OF REFERENCE NUMBERS

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

Abstract

L'invention concerne un foret étagé (10) comportant une extrémité distale (12) et une extrémité proximale (14) opposée, une mèche (16) qui présente à l'extrémité distale (12) du foret étagé (10) une pointe (34) comportant un certain nombre de tranchants (16a, 16b) présentant une géométrie définie, et à chacun desquels est affectée une goujure (36, 38), les tranchants (16a, 16b) s'étendant respectivement sur une première zone de coupe (16c) et formant un tranchant principal (16a) prolongé par un tranchant secondaire (16b). À une certaine distance de l'extrémité distale (12) est agencé au moins un premier étage d'alésage (18) qui comporte un certain nombre de tranchants (18a, 18b) présentant une géométrie définie, et à chacun desquels est affectée une des goujures (36, 38), les tranchants (18a, 18b) s'étendant respectivement sur une seconde zone de coupe (18c) et formant un tranchant principal (18a) prolongé par un tranchant secondaire (18b). Le tranchant principal (18a, 20a, 22a, 24a, 26a, 28a, 30a, 32a) d'un étage d'alésage (18, 20, 22, 24, 26, 28, 30, 32) d'une zone de coupe (18c, 20c, 22c, 24c, 26c, 28c, 30c, 32c) présente respectivement une incurvation continue à partir de la plus petite distance radiale entre l'axe longitudinal (44) et le tranchant principal (18a, 20a, 22a, 24a, 26a, 28a, 30a, 32a) jusqu'à la plus grande distance radiale entre l'axe longitudinal (44) et le tranchant principal (18a, 20a, 22a, 24a, 26a, 28a, 30a, 32a). L'incurvation du tranchant principal (18a, 20a, 22a, 24a, 26a, 28a, 30a, 32a) d'un étage d'alésage (18, 20, 22, 24, 26, 28, 30, 32) d'une zone de coupe (18c, 20c, 22c, 24c, 26c, 28c, 30c, 32c) présente un profil uniforme et forme en coupe longitudinale un segment de cercle prédéfini présentant un rayon de coupe (R1-8).
PCT/EP2019/067302 2018-06-28 2019-06-28 Foret étagé WO2020002581A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112019003181.3T DE112019003181A5 (de) 2018-06-28 2019-06-28 Stufenbohrer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018115624.3A DE102018115624A1 (de) 2018-06-28 2018-06-28 Stufenbohrer
DE102018115624.3 2018-06-28

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WO2020002581A1 true WO2020002581A1 (fr) 2020-01-02

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PCT/EP2019/067302 WO2020002581A1 (fr) 2018-06-28 2019-06-28 Foret étagé

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WO (1) WO2020002581A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4074445A3 (fr) * 2018-04-26 2023-03-01 Milwaukee Electric Tool Corporation Foret étagé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564945A (en) * 1967-10-10 1971-02-23 Barworth Flockton Ltd Drill
DE19526686A1 (de) * 1994-09-09 1996-03-14 Duerr Praezisionswerkzeuge Gmb Mehrstufenbohrer
DE20004523U1 (de) * 2000-03-10 2000-08-17 Quanz, Reiner, 42859 Remscheid Bohrwerkzeug
US20080166195A1 (en) 2007-01-05 2008-07-10 Gentry Charles L Spiral drill bit and method of forming same
WO2008092386A1 (fr) 2007-01-29 2008-08-07 Qi Zhang Foret étagé à rainure spirale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564945A (en) * 1967-10-10 1971-02-23 Barworth Flockton Ltd Drill
DE19526686A1 (de) * 1994-09-09 1996-03-14 Duerr Praezisionswerkzeuge Gmb Mehrstufenbohrer
DE20004523U1 (de) * 2000-03-10 2000-08-17 Quanz, Reiner, 42859 Remscheid Bohrwerkzeug
US20080166195A1 (en) 2007-01-05 2008-07-10 Gentry Charles L Spiral drill bit and method of forming same
WO2008092386A1 (fr) 2007-01-29 2008-08-07 Qi Zhang Foret étagé à rainure spirale

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4074445A3 (fr) * 2018-04-26 2023-03-01 Milwaukee Electric Tool Corporation Foret étagé
US11691203B2 (en) 2018-04-26 2023-07-04 Milwaukee Electric Tool Corporation Step drill bit

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DE102018115624A1 (de) 2020-01-02

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