CH665979A5 - Twist drill bit - has shank grooves at angle which increases progressively towards tip from 15 to 40 degrees - Google Patents
Twist drill bit - has shank grooves at angle which increases progressively towards tip from 15 to 40 degrees Download PDFInfo
- Publication number
- CH665979A5 CH665979A5 CH124086A CH124086A CH665979A5 CH 665979 A5 CH665979 A5 CH 665979A5 CH 124086 A CH124086 A CH 124086A CH 124086 A CH124086 A CH 124086A CH 665979 A5 CH665979 A5 CH 665979A5
- Authority
- CH
- Switzerland
- Prior art keywords
- angle
- degrees
- shank
- drill bit
- twist drill
- Prior art date
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
- B23B2251/043—Helix angles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The twist drill bit consists of a shank (5) and tip (6), with two spiral grooves (1,2) along the sides of the shank for the removal of swarf. The two grooves in the shank are made at an angle which increases towards the tip of the shank, varying progressively from 15 to 40 degrees. ADVANTAGE - Improved drilling of various types of materials.
Description
DESCRIPTION
L'invention a pour objet un outil coupant hélicoïdal comportant au moins une goujure hélicoïdale, telle que foret ou fraise.
Les outils coupants hélicoïdaux connus se caractérisent par un profil constant et un angle d'hélice déterminé et constant sur toute la longueur de l'hélice. Pour le perçage de l'aluminium par exemple, on utilise des forets dont l'angle de l'hélice est relativement grand, généralement de 40 , alors qu'il est plus faible pour le perçage de l'acier, de l'ordre de 25 . Lors du perçage de trous profonds, notamment dans l'aluminium, en raison du grand angle de l'hélice, c'est-à-dire de la faible pente de celle-ci, l'évacuation des copeaux pose un certain problème. Ces copeaux ont en effet tendance à bourrer, ce qui entraîne un blocage du foret et souvent sa cassure. Pour éviter un tel incident, il est nécessaire de débourrer, c'est-à-dire de retirer le foret de son trou pour dégager les copeaux, avant de poursuivre le perçage.
La présente invention a pour but de faciliter l'évacuation des copeaux lors de l'usinage au moyen d'un outil hélicoïdal, par exemple lors du perçage de trous profonds, et par conséquent de permettre l'usinage de trous profonds sans débourrage intermédiaire. On réalise ainsi un gain de temps important.
Dans ce but, l'outil coupant hélicoïdal selon l'invention est caractérisé par le fait que l'angle de l'hélice de la goujure augmente progressivement de la queue de l'outil vers son extrémité.
Le dessin annexé représente, à titre d'exemple, une forme d'exécution de l'invention.
L'unique figure du dessin représente un foret hélicoïdal plus particulièrement destiné au perçage de l'aluminium. Ce foret présente deux goujures hélicoïdales 1 et 2 séparant deux lèvres 3 et 4. L'angle de l'hélice des goujures augmente progressivement de la queue 5 du foret à sa pointe 6. Dans l'exemple représenté, cet angle augmente d'une valeur de 15" à la valeur de 40".
La partie active du foret est en fait située prés de sa pointe; la partie des goujures située en arrière de cette partie active ne sert pratiquement qu'à l'évacuation des copeaux. Or, un angle d'hélice de faible valeur, c'est-à-dire une forte pente d'hélice, facilite l'évacuation des copeaux.
Le foret pourrait présenter une seule goujure. Une fraise, par contre, présentera en général plus de deux goujures.
DESCRIPTION
The subject of the invention is a helical cutting tool comprising at least one helical flute, such as a drill or milling cutter.
Known helical cutting tools are characterized by a constant profile and a determined and constant helix angle over the entire length of the propeller. For drilling aluminum, for example, drills are used whose helix angle is relatively large, generally 40, while it is smaller for drilling steel, of the order of 25. When drilling deep holes, especially in aluminum, due to the large angle of the propeller, that is to say the slight slope of the latter, the evacuation of the chips poses a certain problem. These chips have a tendency to stuff, which causes the drill to jam and often break. To avoid such an incident, it is necessary to dislodge, that is to say remove the drill from its hole to clear the chips, before continuing drilling.
The present invention aims to facilitate the evacuation of chips during machining by means of a helical tool, for example when drilling deep holes, and therefore allow the machining of deep holes without intermediate cleaning. This achieves significant time savings.
For this purpose, the helical cutting tool according to the invention is characterized in that the angle of the flute helix gradually increases from the tail of the tool towards its end.
The accompanying drawing shows, by way of example, an embodiment of the invention.
The only figure in the drawing represents a twist drill more particularly intended for drilling aluminum. This drill has two helical flutes 1 and 2 separating two lips 3 and 4. The angle of the flute helix gradually increases from the tail 5 of the drill to its tip 6. In the example shown, this angle increases by one value from 15 "to the value of 40".
The active part of the drill is actually located near its tip; the part of the flutes located behind this active part is used practically only for the evacuation of the chips. However, a propeller angle of small value, that is to say a steep propeller slope, facilitates the evacuation of the chips.
The drill could have only one flute. A strawberry, on the other hand, will generally present more than two flutes.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH124086A CH665979A5 (en) | 1986-03-27 | 1986-03-27 | Twist drill bit - has shank grooves at angle which increases progressively towards tip from 15 to 40 degrees |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH124086A CH665979A5 (en) | 1986-03-27 | 1986-03-27 | Twist drill bit - has shank grooves at angle which increases progressively towards tip from 15 to 40 degrees |
Publications (1)
Publication Number | Publication Date |
---|---|
CH665979A5 true CH665979A5 (en) | 1988-06-30 |
Family
ID=4205754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH124086A CH665979A5 (en) | 1986-03-27 | 1986-03-27 | Twist drill bit - has shank grooves at angle which increases progressively towards tip from 15 to 40 degrees |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH665979A5 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5312209A (en) * | 1991-12-16 | 1994-05-17 | Sandvik, Ab | Drill |
EP0642863A1 (en) * | 1993-09-14 | 1995-03-15 | Seco Tools Ab | Drill |
US5584617A (en) * | 1995-04-04 | 1996-12-17 | International Business Machines Corporation | Single flute drill for drilling holes in printed circuit boards and method of drilling holes in a printed circuit board |
EP0790092A1 (en) * | 1996-02-14 | 1997-08-20 | Sumitomo Electric Industries, Ltd. | Drill |
WO1998035777A1 (en) * | 1997-02-13 | 1998-08-20 | Vermont American Corporation | Drill bit |
WO2004108334A1 (en) * | 2003-06-04 | 2004-12-16 | Seco Tools Ab | Rotatable tool and a blank |
WO2009033879A1 (en) * | 2007-09-06 | 2009-03-19 | Komet Group Gmbh | Drilling tool for machine tools and method for the production thereof |
EP2298491A1 (en) * | 2009-09-22 | 2011-03-23 | Firma Gühring oHG | Tool with coolant channels |
US8070398B2 (en) | 2008-02-19 | 2011-12-06 | Irwin Industrial Tool Company | Multi-blade self feed bit |
US20120288337A1 (en) * | 2011-05-11 | 2012-11-15 | Karthik Sampath | Rotary cutting tool having pcd cutting tip |
US11311947B2 (en) * | 2017-06-02 | 2022-04-26 | Kyocera Corporation | Rotary tool |
-
1986
- 1986-03-27 CH CH124086A patent/CH665979A5/en not_active IP Right Cessation
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5312209A (en) * | 1991-12-16 | 1994-05-17 | Sandvik, Ab | Drill |
EP0642863A1 (en) * | 1993-09-14 | 1995-03-15 | Seco Tools Ab | Drill |
US5584617A (en) * | 1995-04-04 | 1996-12-17 | International Business Machines Corporation | Single flute drill for drilling holes in printed circuit boards and method of drilling holes in a printed circuit board |
EP0790092A1 (en) * | 1996-02-14 | 1997-08-20 | Sumitomo Electric Industries, Ltd. | Drill |
US5800101A (en) * | 1996-02-14 | 1998-09-01 | Sumitomo Electric Industries, Ltd. | Drill |
WO1998035777A1 (en) * | 1997-02-13 | 1998-08-20 | Vermont American Corporation | Drill bit |
US5807039A (en) * | 1997-02-13 | 1998-09-15 | Credo Tool Company | Drill bit |
CZ301684B6 (en) * | 2003-06-04 | 2010-05-26 | Seco Tools Ab | Blank for a tool and rotary tool comprising such blank |
WO2004108334A1 (en) * | 2003-06-04 | 2004-12-16 | Seco Tools Ab | Rotatable tool and a blank |
US7311479B2 (en) | 2003-06-04 | 2007-12-25 | Seco Tools Ab | Rotatable tool and a blank |
US8944727B2 (en) | 2007-09-06 | 2015-02-03 | Komet Group Gmbh | Drilling tool for machine tools and method for the production thereof |
WO2009033879A1 (en) * | 2007-09-06 | 2009-03-19 | Komet Group Gmbh | Drilling tool for machine tools and method for the production thereof |
US9486885B2 (en) | 2007-09-06 | 2016-11-08 | Komet Group Gmbh | Drilling tool for machine tools and method for the production thereof |
US8070398B2 (en) | 2008-02-19 | 2011-12-06 | Irwin Industrial Tool Company | Multi-blade self feed bit |
EP2298491A1 (en) * | 2009-09-22 | 2011-03-23 | Firma Gühring oHG | Tool with coolant channels |
CN102510789A (en) * | 2009-09-22 | 2012-06-20 | 钴领无限公司 | Blank and tool with cooling channels |
US8998543B2 (en) | 2009-09-22 | 2015-04-07 | Guehring Ohg | Blank and tool with cooling channels |
WO2011035769A1 (en) * | 2009-09-22 | 2011-03-31 | Gühring Ohg | Blank and tool with cooling channels |
US20120288337A1 (en) * | 2011-05-11 | 2012-11-15 | Karthik Sampath | Rotary cutting tool having pcd cutting tip |
US8882412B2 (en) * | 2011-05-11 | 2014-11-11 | Kennametal Inc. | Rotary cutting tool having PCD cutting tip |
DE102012008472B4 (en) | 2011-05-11 | 2022-04-28 | Kennametal Inc. | Improved rotary cutting tool with PCD cutting tip and method of forming a cutting tool |
US11311947B2 (en) * | 2017-06-02 | 2022-04-26 | Kyocera Corporation | Rotary tool |
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Legal Events
Date | Code | Title | Description |
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PL | Patent ceased |