EP1319483B1 - Drill with cylindrical head with hard metal cutters - Google Patents

Drill with cylindrical head with hard metal cutters Download PDF

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Publication number
EP1319483B1
EP1319483B1 EP02027397A EP02027397A EP1319483B1 EP 1319483 B1 EP1319483 B1 EP 1319483B1 EP 02027397 A EP02027397 A EP 02027397A EP 02027397 A EP02027397 A EP 02027397A EP 1319483 B1 EP1319483 B1 EP 1319483B1
Authority
EP
European Patent Office
Prior art keywords
head
shaft
hard metal
drill
support part
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.)
Expired - Lifetime
Application number
EP02027397A
Other languages
German (de)
French (fr)
Other versions
EP1319483A3 (en
EP1319483A2 (en
Inventor
Harald Dr. Feld
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.)
Tigra Hartstoff GmbH
Original Assignee
Tigra Hartstoff GmbH
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 Tigra Hartstoff GmbH filed Critical Tigra Hartstoff GmbH
Publication of EP1319483A2 publication Critical patent/EP1319483A2/en
Publication of EP1319483A3 publication Critical patent/EP1319483A3/en
Application granted granted Critical
Publication of EP1319483B1 publication Critical patent/EP1319483B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S408/00—Cutting by use of rotating axially moving tool
    • Y10S408/713—Tool having detachable cutting edge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/78—Tool of specific diverse material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support

Definitions

  • the invention relates to a cylinder head drill with carbide cutters according to the preamble of claim 1.
  • Cemented carbide cutting edges are desirable because bores, e.g. are produced in the manufacture of furniture parts, usually in resin-bonded pressboard, so that tools made of tool steels without carbide cutting only reach an unsatisfactory service life.
  • the object of the invention is therefore to design a cylinder head drill so that it can be produced inexpensively in quantities with the least possible effort, but achieves the necessary precision.
  • the concept according to the invention thus consists in producing the entire head of the cylinder head drill or tool made of hard metal, specifically by injection molding using hard metal powder mixed with a wax as plasticizer, and sintering the injection-molded green green body while making the shank with a molded head support member made of tool steel.
  • the hard metal head and the head support portion of the shaft are formed with cooperating positive locking elements, which produce both a centering of the head with respect to the shaft when placing the head on the shaft and a positive connection in the circumferential direction, so that on the one hand, the correct rotational position of Head is ensured with respect to the shaft during assembly as well as in the use of the cylinder head drill a positive entrainment of the head is done by the shaft.
  • the connection of the head and shaft by soldering or welding can then be done without any special effort.
  • the cylinder head drill consists of a shaft 1 (FIG. 1) and a head 2 mounted thereon (FIGS. 2 and 3).
  • the shaft 1 consists of a shaft part 11 with front-molded head support part 12, which comprises two approximately disk-like sector-shaped radial arms 13.
  • the head support part 12 has on its upper end face 14 two axial surface projections 15, namely one on each radial arm 13.
  • the head support part 12 has on its end face 14 a central countersink 16.
  • the shaft part 11 is cylindrical in the usual way and serves for clamping the cylinder head drill.
  • the shaft 1 is made entirely of tool steel.
  • the head 2 and 3 show the head 2, which is made in one piece and made of cemented carbide, namely by injection molding of cemented carbide powder mixed with a wax serving as plasticizer and binder, and sintering of the blank thus produced, whereby the wax is completely expelled.
  • the head 2 has on its upper side a central Bohrzentrier dictate 21, two further opposite approximately radially extending main cutting edges 22 and two to each offset by about 90 degrees arranged Vortex 23 for a circumferential pruning.
  • This cutting configuration is basically common.
  • the head On its underside (FIG. 3), the head has a centric pin 24, which fits into the central countersink 16 of the shaft 1. Further, the head 2 is provided on the undersides of its two diametrically opposite Plattensektor Symposiume, where the upper side, the cutting edges 22, 23 are formed, each having a recess 25 in the form of a shallow depression. These shallow recesses 25 are each formed exactly complementary to the surface projections 15 of the head support part 12 of the shaft 1.
  • the head 2 can therefore be placed on the head support portion 12 of the shaft 1, wherein the pin 24 engages on the head bottom as a centering pin in the countersink 16 of the shaft and the surface projections 15 on the head support portion 12 of the shaft 1 in the shallow recesses 25 at the top bottom intervention.
  • the head is positioned with respect to the shaft exactly centric and rotationally correct position and can be welded or soldered to the shaft in a simple operation without the need for devices for producing and maintaining the exact relative positioning.
  • this positive connection allows the transmission of the working torque from the shaft to the head, so that this power transmission does not have to be transmitted via the solder or weld joint.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Powder Metallurgy (AREA)
  • Milling Processes (AREA)

Abstract

The boring-out tool has a shaft with a head-carrier part and a head (2) of hard metal. The shaft and the head are made as separate parts, with interacting positive and non-positive connection elements (e.g. 24) to center them and to position them correctly in the rotary sense relative to each other. The head is entirely sintered from hard metal.

Description

Die Erfindung betrifft einen Zylinderkopfbohrer mit Hartmetallschneiden gemäß Oberbegriff des Anspruchs 1. Hartmetallschneiden sind wünschenswert bzw. erforderlich, da Bohrungen, z.B. bei der Fertigung von Möbelteilen, meist in kunstharzgebundenen Pressspanplatten hergestellt werden, so dass Werkzeuge aus Werkzeugstählen ohne Hartmetallschneiden nur eine unbefriedigende Standzeit erreichen.The invention relates to a cylinder head drill with carbide cutters according to the preamble of claim 1. Cemented carbide cutting edges are desirable because bores, e.g. are produced in the manufacture of furniture parts, usually in resin-bonded pressboard, so that tools made of tool steels without carbide cutting only reach an unsatisfactory service life.

Die Ausbildung eines Zylinderkopfbohrers mit Hartmetallschneiden ist allerdings eine aufwendige Angelegenheit, da sowohl eine Bohrspitze erforderlich ist, als auch sich über die ganze Stirnfläche erstreckende sowie auch am Umfang wirkende Schneiden notwendig sind, um saubere zylindrische Senkbohrungen herzustellen.The formation of a cylinder head drill with carbide cutters, however, is a complicated matter, since both a drill bit is required, as well as over the entire face extending and acting on the circumference cutting are necessary to produce clean cylindrical counterbores.

Aus der EP 1 136 209 A2 ist ein Werkzeug mit den Merkmalen des Oberbegriffs des Anspruchs 1 bekannt.From the EP 1 136 209 A2 a tool having the features of the preamble of claim 1 is known.

Aufgabe der Erfindung ist es daher, einen Zylinderkopfbohrer so auszubilden, dass er in Stückzahlen mit möglichst geringem Aufwand kostengünstig herstellbar ist, aber die notwendige Präzision erreicht.The object of the invention is therefore to design a cylinder head drill so that it can be produced inexpensively in quantities with the least possible effort, but achieves the necessary precision.

Diese Aufgabe wird gemäß der Erfindung durch die im Anspruch 1 angegebene Anordnung gelöst. Eine vorteilhafte Ausgestaltungen der Erfindung ist Gegenstand des Unteranspruch 2.This object is achieved according to the invention by the arrangement specified in claim 1. An advantageous embodiments of the invention is the subject of the dependent claim 2.

Das erfindungsgemäße Konzept besteht also darin, den gesamten Kopf des Zylinderkopfbohrers bzw. Werkzeugs aus Hartmetall herzustellen, und zwar im Spritzgussverfahren unter Verwendung von mit einem Wachs als Plastifizierer versetztem Hartmetallpulver, und Sintern des spritzgegossenen grünen Rohlings, während der Schaft mit einem angeformten Kopfträgerteil aus Werkzeugstahl hergestellt wird. Der Hartmetallkopf und der Kopfträgerteil des Schafts sind dabei mit miteinander zusammenwirkenden Formschlusselementen ausgebildet, die sowohl ein Zentrieren des Kopfs mit Bezug auf den Schaft beim Aufsetzen des Kopfs auf den Schaft als auch eine Formschlussverbindung in Umfangsrichtung herstellen, so dass zum einen auch die richtige Drehposition des Kopfs mit Bezug auf den Schaft beim Zusammensetzen sichergestellt wird als auch im Einsatz des Zylinderkopfbohrers eine formschlüssige Mitnahme des Kopfs durch den Schaft erfolgt. Die Verbindung von Kopf und Schaft durch Löten oder Schweißen kann dann ohne besonderen Aufwand erfolgen.The concept according to the invention thus consists in producing the entire head of the cylinder head drill or tool made of hard metal, specifically by injection molding using hard metal powder mixed with a wax as plasticizer, and sintering the injection-molded green green body while making the shank with a molded head support member made of tool steel. The hard metal head and the head support portion of the shaft are formed with cooperating positive locking elements, which produce both a centering of the head with respect to the shaft when placing the head on the shaft and a positive connection in the circumferential direction, so that on the one hand, the correct rotational position of Head is ensured with respect to the shaft during assembly as well as in the use of the cylinder head drill a positive entrainment of the head is done by the shaft. The connection of the head and shaft by soldering or welding can then be done without any special effort.

Ein Ausführungsbeispiel der Erfindung ist in den anliegenden Zeichnungen dargestellt und wird im folgenden mehr im einzelnen beschrieben. In den Zeichnungen zeigt:

Fig. 1
den Schaft mit Kopfträgerteil in perspektivi-scher Darstellung,
Fig. 2
den Kopf in perspektivischer Darstellung auf seine Oberseite gesehen, und
Fig. 3
den Kopf in perspektivischer Darstellung auf eine Unterseite gesehen.
An embodiment of the invention is illustrated in the accompanying drawings and will be described in more detail below. In the drawings shows:
Fig. 1
the shaft with head support part in perspective view,
Fig. 2
seen the head in perspective on its top, and
Fig. 3
the head seen in perspective on a bottom.

Der erfindungsgemäße Zylinderkopfbohrer besteht aus einem Schaft 1 (Fig. 1) und einem darauf aufgesetzten Kopf 2 (Fig. 2 und 3).The cylinder head drill according to the invention consists of a shaft 1 (FIG. 1) and a head 2 mounted thereon (FIGS. 2 and 3).

Wie Fig. 1 zeigt, besteht der Schaft 1 aus einem Schaftteil 11 mit vorne angeformtem Kopfträgerteil 12, der zwei etwa scheibensektorartig ausgebildete Radialarme 13 umfaßt. Der Kopfträgerteil 12 weist an seiner oberen Stirnfläche 14 zwei axiale Flächenvorsprünge 15 auf, nämlich einen an jedem Radialarm 13. Außerdem weist der Kopfträgerteil 12 an seiner Stirnfläche 14 eine zentrische Ansenkung 16 auf.As shown in FIG. 1, the shaft 1 consists of a shaft part 11 with front-molded head support part 12, which comprises two approximately disk-like sector-shaped radial arms 13. The head support part 12 has on its upper end face 14 two axial surface projections 15, namely one on each radial arm 13. In addition, the head support part 12 has on its end face 14 a central countersink 16.

Der Schaftteil 11 ist in üblicher Weise zylindrisch geformt und dient zum Einspannen des Zylinderkopfbohrers.The shaft part 11 is cylindrical in the usual way and serves for clamping the cylinder head drill.

Der Schaft 1 ist insgesamt aus Werkzeugstahl gefertigt.The shaft 1 is made entirely of tool steel.

Die Fig. 2 und 3 zeigen den Kopf 2, der einstückig und insgesamt aus Hartmetall hergestellt ist, nämlich durch Spritzgießen aus mit einem als Plastifizierer und Bindemittel dienenden Wachs vermischtem Hartmetallpulver, und Sintern des so hergestellten Rohlings, wobei das Wachs vollständig ausgetrieben wird.2 and 3 show the head 2, which is made in one piece and made of cemented carbide, namely by injection molding of cemented carbide powder mixed with a wax serving as plasticizer and binder, and sintering of the blank thus produced, whereby the wax is completely expelled.

Der Kopf 2 weist an seiner Oberseite eine mittige Bohrzentrierspitze 21, weiter zwei davon gegenüberliegend etwa radial verlaufende Hauptschneiden 22 und zwei dazu jeweils um etwa 90 Grad versetzt angeordnete Vorschneiden 23 für einen umfangsmäßigen Vorschnitt auf. Diese Schneidenkonfiguration ist grundsätzlich an sich üblich.The head 2 has on its upper side a central Bohrzentrierspitze 21, two further opposite approximately radially extending main cutting edges 22 and two to each offset by about 90 degrees arranged Vorschneiden 23 for a circumferential pruning. This cutting configuration is basically common.

An seiner Unterseite (Fig. 3) weist der Kopf einen zentrischen Zapfen 24 auf, der in die zentrische Ansenkung 16 des Schafts 1 paßt. Weiter ist der Kopf 2 an den Unterseiten seiner beiden diametral gegenüberliegenden Plattensektorbereiche, an denen oberseitig die Schneiden 22, 23 gebildet sind, mit jeweils einer Aussparung 25 in Gestalt einer flachen Vertiefung versehen. Diese flachen Vertiefungen 25 sind jeweils genau komplementär zu den Flächenvorsprüngen 15 des Kopfträgerteils 12 des Schafts 1 ausgebildet.On its underside (FIG. 3), the head has a centric pin 24, which fits into the central countersink 16 of the shaft 1. Further, the head 2 is provided on the undersides of its two diametrically opposite Plattensektorbereiche, where the upper side, the cutting edges 22, 23 are formed, each having a recess 25 in the form of a shallow depression. These shallow recesses 25 are each formed exactly complementary to the surface projections 15 of the head support part 12 of the shaft 1.

Der Kopf 2 kann also auf den Kopfträgerteil 12 des Schafts 1 aufgesetzt werden, wobei der Zapfen 24 an der Kopfunterseite als Zentrierzapfen in die Ansenkung 16 des Schafts eingreift und die Flächenvorsprünge 15 auf dem Kopfträgerteil 12 des Schafts 1 in die flachen Vertiefungen 25 an der Kopfunterseite eingreifen. Dadurch wird der Kopf mit Bezug auf den Schaft exakt zentrisch und drehpositionsrichtig positioniert und kann in einem einfachen Vorgang mit dem Schaft verschweißt oder verlötet werden, ohne dass dafür Vorrichtungen zum Herstellen und Aufrechterhalten der exakten relativen Positionierung notwendig sind. Außerdem ermöglicht diese Formschlussverbindung die Übertragung des Arbeitsdrehmoments vom Schaft auf den Kopf, so dass diese Kraftübertragung nicht über die Löt- oder Schweißverbindung übertragen werden muß.The head 2 can therefore be placed on the head support portion 12 of the shaft 1, wherein the pin 24 engages on the head bottom as a centering pin in the countersink 16 of the shaft and the surface projections 15 on the head support portion 12 of the shaft 1 in the shallow recesses 25 at the top bottom intervention. As a result, the head is positioned with respect to the shaft exactly centric and rotationally correct position and can be welded or soldered to the shaft in a simple operation without the need for devices for producing and maintaining the exact relative positioning. In addition, this positive connection allows the transmission of the working torque from the shaft to the head, so that this power transmission does not have to be transmitted via the solder or weld joint.

Es versteht sich, dass hinsichtlich der exakten Form von Kopfträgerteil des Schafts und des Kopfs selbst vielerlei Modifikationen denkbar sind und auch die Konfiguration der miteinander zusammenwirkenden Formschlusselemente im Rahmen des zweckmäßigen relativ beliebig gewählt werden kann, ohne dabei den Schutzbereich der Ansprüche zu verlassen.It is understood that with regard to the exact form of head support part of the shaft and the head itself many modifications are conceivable and also the configuration of cooperating positive locking elements can be selected within the appropriate relatively arbitrary, without departing from the scope of the claims.

Claims (2)

  1. Drill bit with cylindrical head having a head (2) provided with hard metal cutters (22, 23), and a shaft (1) for clamping, wherein
    the shaft (1) and the head (2) are formed as separate components that are connected by material connection,
    the head (2) is formed completely as a sintered body made of hard metal,
    the shaft (1) is formed with a head support part (12), onto which the head (2) is attached at the front side,
    characterized in that
    the head support part (12) of the shaft (1) and the head (2) are provided with single-piece form-fitting elements (15, 16, 24, 25) co-operating with each other, which both center (16, 24) the head with respect to the shaft, as well as position (15, 25) the same with respect to the pivoting position, wherein the form-fitting elements have surface projections (15), as well as plane recesses (25) complementary thereto, at both shaft (1) and head (2) parts for the positioning with respect to the pivoting position, and wherein the form-fitting elements have a centering pin (24) disposed on one of the shaft (1) and the head (2) parts for centering, and a counter bore (16) disposed on the other respective part.
  2. Drill bit with cylindrical head or tool according to claim 1, characterized in that the shaft support part (12) of the shaft (1) is provided with plate-like elements (13), on which the surface projections (15) are formed, and the complementary plane recesses (25) are formed on the bottom side of the head.
EP02027397A 2001-12-15 2002-12-09 Drill with cylindrical head with hard metal cutters Expired - Lifetime EP1319483B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10161823 2001-12-15
DE10161823A DE10161823A1 (en) 2001-12-15 2001-12-15 Cylinder head drill or similar tool with hard metal cutting

Publications (3)

Publication Number Publication Date
EP1319483A2 EP1319483A2 (en) 2003-06-18
EP1319483A3 EP1319483A3 (en) 2005-02-02
EP1319483B1 true EP1319483B1 (en) 2007-08-08

Family

ID=7709449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02027397A Expired - Lifetime EP1319483B1 (en) 2001-12-15 2002-12-09 Drill with cylindrical head with hard metal cutters

Country Status (8)

Country Link
US (1) US6986627B2 (en)
EP (1) EP1319483B1 (en)
AT (1) ATE369239T1 (en)
CA (1) CA2414252C (en)
DE (2) DE10161823A1 (en)
DK (1) DK1319483T3 (en)
ES (1) ES2290237T3 (en)
PT (1) PT1319483E (en)

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RU2490098C2 (en) * 2008-04-03 2013-08-20 Кеннаметал Инк. Rotary tool, in particular, drill

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US8235080B2 (en) * 2008-11-17 2012-08-07 Lee Valley Tools, Ltd. Interlocking, adjustable edge-forming router bit
US8727679B2 (en) * 2009-09-10 2014-05-20 Techtronic Power Tools Technology Limited Wood boring bit
CN104582876A (en) * 2012-07-26 2015-04-29 钴碳化钨硬质合金公司 Composite sintered powder metal articles
US10835969B1 (en) 2018-06-29 2020-11-17 Andrew James Scaglione Self-aligning counter bore cutting tool and method of operation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2490098C2 (en) * 2008-04-03 2013-08-20 Кеннаметал Инк. Rotary tool, in particular, drill

Also Published As

Publication number Publication date
US20030118415A1 (en) 2003-06-26
DK1319483T3 (en) 2007-12-03
ATE369239T1 (en) 2007-08-15
EP1319483A3 (en) 2005-02-02
DE50210633D1 (en) 2007-09-20
PT1319483E (en) 2007-10-17
CA2414252A1 (en) 2003-06-15
US6986627B2 (en) 2006-01-17
ES2290237T3 (en) 2008-02-16
EP1319483A2 (en) 2003-06-18
DE10161823A1 (en) 2003-06-26
CA2414252C (en) 2011-08-23

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