EP2714311A1 - Foret - Google Patents

Foret

Info

Publication number
EP2714311A1
EP2714311A1 EP12724613.0A EP12724613A EP2714311A1 EP 2714311 A1 EP2714311 A1 EP 2714311A1 EP 12724613 A EP12724613 A EP 12724613A EP 2714311 A1 EP2714311 A1 EP 2714311A1
Authority
EP
European Patent Office
Prior art keywords
drill
shank
drill shank
head
grooves
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.)
Withdrawn
Application number
EP12724613.0A
Other languages
German (de)
English (en)
Inventor
Günter Stiebitz
Matthias Mack
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.)
SWG Schraubenwerk Gaisbach GmbH
Original Assignee
SWG Schraubenwerk Gaisbach 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 SWG Schraubenwerk Gaisbach GmbH filed Critical SWG Schraubenwerk Gaisbach GmbH
Publication of EP2714311A1 publication Critical patent/EP2714311A1/fr
Withdrawn legal-status Critical Current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
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/08—Brazed connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/16—Welded connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/21—Glued connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2240/00—Details of connections of tools or workpieces
    • B23B2240/36—Connections using a tongue and a hollow of corresponding prismatic form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for

Definitions

  • the invention relates to a drill, in particular a twist drill.
  • Twist drills have a drill shank which has slots for chip removal running obliquely to the longitudinal axis. At the one end of the drill shank a clamping end is formed, which is adapted to the usual tool holders. At the opposite end of the drill shank a drill head is formed, which has drill bits and takes over the actual drilling work.
  • a drill in two parts, comprising a steel drill stem and a tungsten carbide drill head.
  • the grooves of the drill shank can be made by a machining process or by rolling.
  • a clamping end to be machined only is formed (EP 2253401 A1).
  • the invention is based on the object to provide a drill that can be produced inexpensively and still delivers good work results. To solve this problem, the invention proposes a drill with the features mentioned in claim 1. Further developments of the invention are the subject of dependent claims. - -
  • the proposed by the invention drill thus contains a drill shank with grooves. At the one end of this shaft a clamping end is formed. This is produced by a relatively inexpensive process of the drill shank with its clamping end.
  • the drill head which has a more complicated shape, is manufactured separately and then connected to the end facing away from the chuck end of the drill shank. It takes place in the circumferential direction, d. H. in the direction in which the larger forces occur during drilling, a positive connection. In the axial direction, a frictional connection can be sufficient, since forces occur at most in the compression direction.
  • Drills having such helical grooves are often referred to as twist drills, although the shape of the grooves is not a spiral shape.
  • the production of the drill shank with the grooves can be done in different ways, both by machining and by rolling rollers.
  • the forming and arranging the clamping end can be done by cutting or non-cutting machining.
  • the drill shank has a flat end surface.
  • the initially mentioned positive connection in the direction of rotation can therefore be done at another location.
  • the flat end face of the drill shank and the cooperating planar mating face of the drill head serve to transfer the pressing force required during drilling to the drill head in such a way that it maintains its orientation with respect to the axis of rotation of the drill.
  • the drill shank has an end portion in which its appearance, its arrangement and / or its cross section with respect to the rest of the drill shank is changed.
  • the mentioned in the direction of rotation positive locking of the drill head relative to the drill shank is changed.
  • end portion may be formed according to the invention in a further development is that the end portion relative to the rest of the drill shank has a modified shape.
  • the end section has the same shape as the drill shank in front of the end section, the shape is smaller or differently arranged relative to the drill shank.
  • the end section has a geometrically similar but reduced cross-sectional shape as the previous part of the drill shank.
  • the end portion has the same cross-sectional shape, but this is oriented differently. If, for example, the drill shank is coiled, then it is conceivable that the end section is no longer coiled, but extends in a straight line in the axial direction. The spiral grooves pass into the grooves of the end section. There are also provided combinations of these possibilities according to the invention.
  • drills have grooves, in particular helically arranged grooves, which serve for chip removal. Since the chips are formed on the drill head, preferably the drill head also has such grooves, which merge into the grooves of the drill shank. - -
  • a possibility proposed by the invention, as a form-fit can be realized in the direction of rotation, is that the drill head has over its parting surface to the drill shank projecting, engaging in grooves of the drill shank projections. If, for example, the drill shank has four helical grooves, or even four grooves arranged in a straight line, the drill head can likewise have four projections which engage in the grooves in the region of the end section of the drill shank. If the grooves in the drill shank are helical, the projections of this helical shape are adapted.
  • grooves or projections there are also other numbers of grooves or projections possible, preferably between two and six grooves and projections.
  • a further possibility proposed by the invention for implementing the positive connection in the direction of rotation may be that the drill head is designed as a cap which is placed on the end of the drill shaft.
  • the cap has a cross-sectional shape corresponding to the cross-sectional shape of the end portion of the drill shank, particularly the end portion of the drill shank.
  • the outer diameter of the drill head may be equal to the outer diameter of the drill shank when the end portion has a smaller cross-section than the drill shank in front of the end portion. Then the cap can bridge this difference.
  • the outer diameter of the drill head to twice the wall thickness of the cap is greater than the outer diameter of the drill shank.
  • the drill on the preferably flat front side of the drill shank a polygonal Zap- - - fen, which engages in a complementarily shaped recess in the drill shaft facing the end face of the drill head.
  • this pin can have the cross-sectional shape of a regular hexagon.
  • the drill shank can have between two and six grooves, in particular four grooves and an equal number of ribs.
  • the drill stem is made of a material that is less hard to allow production by extrusion.
  • the drill shank itself does not contribute to the actual drilling process, which is why a lower hardness is sufficient.
  • the drill head may be made of hard metal.
  • the drill head itself is very small in the axial direction of the drill, so that the cost for the production and processing of the drill head in relation to a production of the entire drill bit made of hard metal is low.
  • connection which permanently holds the drill head to the drill shank, can be done by welding, soldering, gluing or the like.
  • the clamping end can according to the invention have a polygonal, in particular hexagonal, cross section. It is also possible that the chucking end has SDS shape.
  • the drill shank is made by extrusion. It is used for this purpose, a material that can be deformed by extrusion. - -
  • the clamping end is formed at the end of the shaft, ie by a process without the formation of chips.
  • Figure 1 is a side view of a drill according to the invention with not yet attached drill head;
  • FIG. 2 is an enlarged view of the upper end of the drill
  • Figure 3 perspective, the assignment between the drill head and drilling rschaft;
  • Figure 4 is an end view of the drill;
  • FIG. 5 is a perspective view of the drill of FIGS. 1 to
  • Figure 6 is a representation corresponding to Figure 1 of a second
  • Figure 7 is the front view of the drill of Figure 6;
  • Figure 8 shows a section through the drill head of the embodiment according to
  • Figure 9 is a representation corresponding to Figure 3.
  • Figure 10 is a representation corresponding to Figure 5 of the embodiment of Figure 6;
  • Figure 1 1 is a side view of a drill of a third embodiment
  • Figure 12 is a representation corresponding to Figure 2 of the front
  • Figure 13 is an end view
  • Figure 14 is a representation corresponding to Figure 3;
  • Figure 15 is a perspective view of the drill of Figure 1 1;
  • Figure 16 is a side view of another embodiment;
  • Figure 17 is an enlarged view of the end of the drill of
  • Figure 18 is an end view of the drill;
  • Figure 19 is a perspective view of the connection between
  • Figure 20 is a representation corresponding to Figure 5 and 10 of the embodiment of Figure 16;
  • Figure 21 is a side view of a drill of another embodiment. - -
  • FIG. 22 shows the assignment between drill head and drill shank
  • Figure 23 is an end view of the end surface of the drill shank
  • FIG. 24 is a perspective view of the association between the drill head and the drill collar
  • Figure 25 is a perspective view of the drill of Figure 21;
  • Figure 26 shows one end of the drill shank
  • Figure 27 shows another end of a drill shank
  • Figure 28 is a third end of a drill shank
  • Figure 29 is an end of a drill stem according to a fourth embodiment
  • FIG. 30 shows the end of the drill shank of the embodiment according to FIG. 21.
  • the drill shown in Figure 1 in a side view shortly before its completion contains a drill shank 1, at its one lower end in Figure 1, a clamping end 2 is formed with a cross section in the form of a regular hexagon.
  • the drill shank comprises four grooves 3 which extend in the form of a right-hand screw over the length of the drill shank 1 until they reach a boundary 4 at which an end region 5 of the drill shank 1 begins. From this boundary 4, the grooves 3 then extend straight, just like the ribs 6, which separate the grooves 3 from each other.
  • the end of the drill shank 1 opposite the chuck end 2 ends in a flat face. - 7.
  • the drill shank 1 is produced by extrusion.
  • a drill head 10 is provided, which is made of hard metal.
  • This drill head 10 has a plane end face 1 1, which is associated with the end face 7 of the drill shank 1 and this is opposite.
  • the drill head 10 includes a total of four pin-like projections 12 which are arranged in the grooves 13 of the drill head 10 and projecting beyond the drill shaft 1 facing end face 1 1 of the drill head 12.
  • the drill head 10 Similar to the drill shank 1, the drill head 10 includes ribs 16 and grooves 13 which correspond in their arrangement, shape and size to the grooves 3 and ribs 6 of the drill shank.
  • the drill is completed by the drill head 10 is pushed onto the drill shank 1 until its end face 1 1 bears against the end face 7 of the drill shank.
  • the projections 12 of the drill head 10 come to lie in the grooves 3 'of the drill shank 1.
  • the engagement of the projections 12 in the grooves 3 'of the drill shank 1 creates a positive fixing in the direction of rotation.
  • a weld between the projections 12 and the drill shank first This is shown at reference numeral 15.
  • FIG. 4 shows how the projections 12 between which ribs 6 and 16 are arranged.
  • the perspective view of Figure 5 explains the type of composition again. There you can also see the cutting edges of the drill head. - -
  • the cross-sectional shape in the end region 5 of the drill shank the cross-sectional shape is the same as in the preceding region of the drill shank, but in the axial direction there is no longer any rotation of the cross-sectional shape.
  • Their projecting over the end face 1 1 length corresponds to the axial length of the end portion 5.
  • the embodiment shown in Figures 6 to 10 initially differs in that the end portion 5 of the drill shank 1 has a reduced outer diameter.
  • the shape of the end region can best be seen from FIG. 9.
  • the cross-sectional shape corresponds to the cross-sectional shape of the drill shank in front of the end region, with the difference that the cross-sectional shape is geometrically similar but reduced in size.
  • grooves 3 'and arranged between the grooves ribs 6' are formed.
  • the separation point 4 between the drill shank 1 in front of the end region 5 and the end region 5 itself forms a step.
  • the drill head 20 has an outer shape which, except for the missing protrusions 12, corresponds to the outer shape of the drill head 10 of the previous embodiment.
  • the drill head 20 thus has ribs 16 and grooves 13 lying between the ribs.
  • a recess 21 extends from the end side facing the drill shank 1 into the drill head 20, the shape of which is complementary to the outer shape of the end region 5 of the drill shank 1.
  • the recess 21 extends deep into the drill head 20.
  • the recess 21 has a flat bottom 22, which corresponds to the end face 7 of the end portion 5 of the drill shank 1.
  • the drill head 20 is placed on the end portion until it rests on the separation point 4 formed as a step.
  • FIGS. 16 and 20 again uses a solid drill head 40 with a flat end face facing the end of the drill shank.
  • pin-like projections 42 are fastened or arranged, whose projecting over the end face of the drill head 40 parts 44 are angled so that they follow the shape of the grooves 3 of the drill shank.
  • the projections 42 are welded in the region of its end portion with the drill shank 1.
  • the grooves 13 and ribs 16 of the drill head 40 are again rectilinear as in the embodiment of FIGS.
  • the ribs 16 and grooves 13 it would also be possible for the ribs 16 and grooves 13 to continue the helical shape of the drill shank 1 also in the region of the drill head 40, similar to the embodiment of FIGS. 1 to 15.
  • Figures 21 to 25 show a fifth embodiment of a drill according to the invention.
  • a pin 51 is formed, which has a hexagonal cross-section.
  • the diameter of the pin is significantly smaller than the diameter of the end face 7.
  • the drill head 50 includes a flat end face 1 1, from which a recess leads into its interior, which is the shape of the pin 51 complementary. After placing the drill head 50 is a weld along the separation point between the two parts.
  • the following figures 26 to 30 again show different types of the end region of the drill shank on the side to which the drill head is to be attached.
  • the end region 5 of Figure 26 corresponds to the embodiment of Figure 1 to 5.
  • the cross-sectional shape of the end portion 5 is identical to the cross-sectional shape of the drill shank to the separation point 4. However, the orientation of the cross-sectional shape in the axial direction then no longer changes, while the orientation in the preceding Area of the drill shank twisted in the axial direction.
  • FIG. 27 shows the end of the drill shank 1 of the embodiment according to FIGS. 7 to 10.
  • the cross-sectional shape in the end region 5 is geometrically reduced in a similar manner to the cross-sectional shape in the preceding region of the drill shank.
  • the orientation of the cross-sectional shape no longer changes in the axial direction in the end region, while it is continuously twisted in the axial direction in the preceding region.
  • FIG. 28 shows the end of the drill shaft, as it is formed in the embodiment according to FIG. 16 to FIG. There is virtually no end area in which anything changes in the appearance, orientation, shape, or size of the drill shank 1.
  • FIG. 29 shows an end region 5 of the drill shank 1 corresponding to the embodiment according to FIGS. 1 to 15.
  • the cross-sectional shape is geometrically similar to the previous part of the drill shank 1, and the orientation of the cross-sectional shape also twists in the end region when advancing in the axial direction ,
  • FIG. 30 shows the end of the drill shank corresponding to the embodiment according to FIGS. 21 to 25.

Landscapes

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

Abstract

L'invention concerne un foret comprenant une tige de foret (1) produite par exemple par filage et munie à une de ses extrémités d'une section de serrage (2) moulée de forme hexagonale avec ou sans évidements. A l'extrémité avant libre opposée (7) de la tige de foret (1) se trouve une tête de forage (10) fabriquée séparément dans un métal dur et fixée de telle manière qu'il existe dans le sens de rotation du foret une liaison par complémentarité de forme entre la tige de foret (1) et la tête de forage (310). La liaison par complémentarité de forme peut être produite de différentes manières. Des tenons (12) dépassant au-delà de la face frontale (11) de la tête de forage (10) tournée vers la tige de foret (1) et agencés dans des rainures (13) de la tête de forage (10) viennent en prise dans des rainures correspondantes (3) de la tige de foret (1).
EP12724613.0A 2011-06-01 2012-05-29 Foret Withdrawn EP2714311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011076890A DE102011076890A1 (de) 2011-06-01 2011-06-01 Bohrer
PCT/EP2012/060005 WO2012163897A1 (fr) 2011-06-01 2012-05-29 Foret

Publications (1)

Publication Number Publication Date
EP2714311A1 true EP2714311A1 (fr) 2014-04-09

Family

ID=46197255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12724613.0A Withdrawn EP2714311A1 (fr) 2011-06-01 2012-05-29 Foret

Country Status (3)

Country Link
EP (1) EP2714311A1 (fr)
DE (1) DE102011076890A1 (fr)
WO (1) WO2012163897A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015203400B4 (de) * 2015-02-25 2018-05-30 Robert Bosch Gmbh Bohrwerkzeug
CN110524032B (zh) * 2019-08-14 2024-12-06 江苏爵克数控刀具有限公司 一种可换式的宝塔形钻头
EP4342610A1 (fr) * 2022-09-23 2024-03-27 CERATIZIT Hard Material Solutions S.à r.l. Tête de perçage pour maçonnerie
EP4410460A1 (fr) * 2023-02-03 2024-08-07 Hilti Aktiengesellschaft Marteau perforateur

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3307809B2 (ja) * 1995-10-05 2002-07-24 兼房株式会社 シャンク付回転工具
SE510533C2 (sv) * 1996-11-04 1999-05-31 Seco Tools Ab Verktyg för skärande bearbetning
US6595305B1 (en) * 2000-02-15 2003-07-22 Kennametal Inc. Drill bit, hard member, and bit body
US7097396B1 (en) * 2000-02-16 2006-08-29 Kabushiki Kaisha Miyanaga Drill bit
DE20102914U1 (de) * 2001-02-19 2001-05-03 Berner GmbH, 74653 Künzelsau Bohrer mit Bohrkopf aus Hartmetall
DE102006000251A1 (de) * 2006-05-30 2007-12-06 Hilti Ag Hartstoffkopf und Drehschlagbohrer
DE102006035453A1 (de) * 2006-11-17 2008-05-21 Hilti Ag Bohrwerkzeug mit Hartstoffkopf
DE102008017540A1 (de) * 2008-04-03 2009-10-08 Kennametal Inc. Drehwerkzeug, insbesondere Bohrwerkzeug
DE102009003287A1 (de) 2009-05-20 2010-11-25 Hilti Aktiengesellschaft Bohrer
WO2010142458A2 (fr) 2009-06-12 2010-12-16 Sieber Forming Solutions Gmbh Procédé et dispositif permettant de fabriquer des pièces en métal de forme allongée pourvues de rainures hélicoïdales, en particulier des forets hélicoïdaux ou des vis sans fin

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012163897A1 *

Also Published As

Publication number Publication date
DE102011076890A1 (de) 2012-12-06
WO2012163897A1 (fr) 2012-12-06

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