EP3727733A1 - Method for producing a cutting section for a drill bit - Google Patents
Method for producing a cutting section for a drill bitInfo
- Publication number
- EP3727733A1 EP3727733A1 EP18815261.5A EP18815261A EP3727733A1 EP 3727733 A1 EP3727733 A1 EP 3727733A1 EP 18815261 A EP18815261 A EP 18815261A EP 3727733 A1 EP3727733 A1 EP 3727733A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- closed
- tubular element
- slot
- closed tubular
- face
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000010985 leather Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 19
- 238000005553 drilling Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0461—Drills for trepanning with exchangeable cutting heads or crowns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/04—Drills for trepanning
- B23B51/0467—Details of the tubular body sidewall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
Definitions
- the present invention relates to a method for producing a cutting section for a drill bit according to the preamble of claim 1.
- WO 2014/096359 A1 discloses a cutting section for a drill bit, which can be connected to a drill shaft section of the drill bit via a releasable connection device.
- the releasable connection means is formed out as a combined plug-and-turn connection.
- a "plug-in rotary connection” releasable connections between a first and second connecting element are referred to form a plug connection in one direction and are additionally connected via a rotary connection.
- the cutting section comprises one or more drill segments, a ring section, an outer plug element and an annular stop shoulder at the transition from the ring section to the outer plug element.
- Cutting sections which are connectable to a combined plug-and-turn connection, who sold under the product name "Hilti DD X-CM".
- the cutting sections "Hilti DD X-CM” comprise a plurality of drilling segments, a ring portion and an outer plug element, wherein at the transition from the ring portion to the outer plug element is an annular stop shoulder for power transmission. The torque transmission takes place with the aid of pin elements, which interact with slot-shaped recesses in the outer plug element.
- the cutting sections "Hilti DD X-CM” are made of a closed tube element. In this case, the annular stop shoulder is produced by turning and the slot-shaped recesses are produced by milling.
- a disadvantage of the structure of the known cutting sections "Hilti DD X-CM” are the high produc- tion effort through the turning of the annular stop shoulder and the milling of the slot-shaped recesses. In addition, the choice of materials for the ring portion and the outer plug element is limited. Since the cutting sections “Hilti DD X-CM” are made of a closed tube element, it must be considered the demands on the cutting section in terms of power transmission, torque transmission and tensile loads when removing a jammed drill bit a compromise in material selection are made.
- the object of the present invention is to reduce the manufacturing effort in the production of the cutting section in a method for producing a cutting section for a drill bit.
- the functionality of the cutting section when drilling with the drill bit with respect to power transmission, torque transmission and / or tensile loads when removing a jammed drill bit to be improved.
- the cutting section for a drill bit produced by the method according to the invention is connected to a drill shaft section of the drill bit via a releasable connection device.
- the method for producing a cutting section for a drill bit is characterized by the method steps:
- a first closed pipe element of a first hollow cylinder with a first outer lateral surface, a first inner surface, a first lower face, and a first upper end face is formed in shape and has a first hollow cylinder height, a first inner diameter and a first outer diameter to,
- a second closed tubular element is formed in the form of a second hollow cylinder having a second outer lateral surface, a second inner lateral surface, a two th lower end surface and a second upper end surface and has a second hollow cylindrical height, a second inner diameter and a second outer diameter, wherein the first outer diameter is smaller than the second inner diameter and the first outer lateral surface touches the second inner circumferential surface,
- the cutting portion made by the method of the invention includes a first closed tube member, a second closed tube member, and at least one drill segment.
- the first closed tubular element is designed in the form of a first hollow cylinder and comprises a first outer lateral surface, a first inner lateral surface, a first lower end surface and a first upper end surface.
- the second closed-tube element is formed in the form of a second hollow cylinder and comprises a second outer lateral surface, a second inner lateral surface, a second lower end surface and a second upper end surface.
- the first closed tubular element and the second closed tubular element are nested and the one or more bore segments are connected to the first closed tubular element and the second closed tubular element.
- the drilling segments are connected to the first and second closed tubular element.
- the cutting portion is constructed so that the power transmission from a Bohrschaftab section via the first closed tubular element and the torque transmission from the Bohrschaftabexcellent via the second closed tubular element takes place.
- the first upper end surface forms an annular stop shoulder, which is used for power transmission.
- a Bohrschaftabites transmits the force by means of an annular end face on the annular stop shoulder.
- the torque transmission takes place, for example via Stif tide the Bohrschaftabiteses, which cooperate with slot-shaped recesses in the second ge connected pipe element.
- the first closed pipe element and the second closed pipe element are formed as a hollow cylinder with annular cross-sections and have a constant Ma terialrank on.
- the first closed tubular element can be made of a first planar sheet metal part, which is formed into a first open tubular element and is connected to the first butt edges cohesively or positively.
- the second closed-tube element can be made from a second planar sheet metal part, which is reshaped to egg nem second open tubular element and stoffschlüs sig or positively connected to second butt edges.
- the first lower end face of the first closed pipe element and the second lower end face of the second closed pipe element are aligned aligned tet.
- the flush alignment of the first lower end surface and the second lower Stirnflä surface has the advantage that a wide connection surface for the Bohrsegmente arises, at which the Bohrsegmente can be connected to the first closed pipe element and the second ge connected pipe element.
- the one or more drilling segments are connected to the first un direct end face and the second lower end face.
- the flush Ausrich tion of the first lower end face and the second lower end face creates a wide connection surface for the Bohrsegmente.
- the first closed-pipe element and the second closed pipe element can be connected simultaneously with the Bohrsegmenten. If the drill segments are connected simultaneously to the first and second closed pipe members, the manufacturing cost can be reduced. Depending on the material thicknesses used, it may be necessary for the first closed tube element and the second closed tube element to be additionally joined together. If higher moments of resistance are required, the first closed pipe element and the second closed Rohrele element can be additionally connected to each other.
- At least one slot-shaped recess is preferably created in the second closed tubular element, wherein the at least one slot-shaped recess comprises a transverse slot and a connecting slot and the connecting slot connects the transverse slot with the second upper end face of the second closed tubular element.
- the min least one slot-shaped recess is part of the releasable connection means which connects the cutting portion with a Bohrschaftabêt of the drill bit.
- the slot-shaped recess is formed in T-shape or L-shape and allows in the connected state of the drill bit a relative movement between the cutting portion and the Bohrschaftabexcellent. By the relative movement between the cutting portion and the Bohrschaftabexcellent a jammed cutting section can be released from the ground.
- At least one transverse groove is particularly preferably provided in the second inner circumferential surface, wherein the at least one transverse groove is arranged at the level of the connecting slot of the slot-shaped recess.
- the at least one transverse groove is part of the releasable connection device Ver that connects the cutting section with a Bohrschaftabmale the drill bit.
- the width of the transverse groove is greater than or equal to the width of the transverse slot of the slot-shaped recess. In the transverse groove of the cutting section engages a matching Cross nose of a drill shank section.
- transverse groove and transverse nose form an addi tional positive connection, which prevents the plug-and-turn connection is inadvertently opened when loosening a jammed drill bit and the Bohrschaftabites is removed without cutting section from the ground.
- At least one inner recess is created in the first inner lateral surface, which extends over the first hollow cylinder height.
- the at least one inner recess in the first inner circumferential surface can form a transport channel for a cooling and rinsing liquid and allows the formation of cutting sections with small mecanicerstän- the drill segments on the inside of the cutting section.
- the width, depth, shape and / or number of the inner recess are adapted to the required amount of liquid of the cooling and rinsing liquid.
- the first closed tubular element is made of a first material and the second closed tubular element is made of a second material.
- the cutting section produced by the method according to the invention is constructed so that the force is transmitted to the cutting section via the first closed tubular element and the torque transmission to the cutting section via the second closed tubular element.
- FIGS. 1 A, B a drill bit having a cutting portion and a Bohrschaftabêt connectable via a releasable connection means, in an unconnected state of the drill bit ( Figure 1 A) and in a connected to the drill bit ( Figure 1 B).
- FIGS. 2A-C show the cutting section of FIG. 1 consisting of a first closed
- Pipe element a second closed tubular element and a plurality of drill segments in a longitudinal section along the section line A-A in FIG. 1 A;
- FIGS. 1 A, B show a drill bit 10, which comprises a cutting portion 11 and a Bohr shank portion 12, wherein the cutting portion 1 1 and the drill shank portion 12 via a releasable connection means 13 are connectable.
- the cutting section 1 1 comprises a first closed tubular element 14, a second ge connected tubular element 15 and a plurality of drilling segments 16, which are connected to the first closed-tube element 14 and the second closed tubular element 15.
- the cutting section 1 1 is produced by means of the method according to the invention for producing a cutting section from the first closed tubular element 14, the second GE closed tubular element 15 and the drilling segments 16.
- the drill segments 16 are connected to the first closed tube member 14 and the second closed tube member 15, wherein the first and second tube member 14, 15 are also connected to each other in the region of the connection. If necessary, the first closed pipe element 14 and the second closed pipe element 15 can be additionally connected to each other.
- the drill segments 16 are arranged in a ring and form a drill ring with intermediate spaces.
- the cutting section 1 1 may instead of several drilling segments 16 also have a single nes trained as a closed drill ring drilling segment.
- the drilling segments 16 may be welded, brazed, bolted or connected in another suitable fastening manner to the first closed tubular member 14 and the second closed tubular member 15 with the first closed tubular member 14 and the second closed tubular member 15.
- the drill shank portion 12 comprises a tubular Drill shank 17, a lid 18 and a spigot 19, via which the drill bit 10 is mounted in a tool holder of a core drill.
- the releasable connection device 13 is designed in the form of a combined plug-and-turn connection, as disclosed in WO 2014/096359 A1.
- the releasable connec tion device 13 comprises a first plug-in element 21, which is integrated in the cutting section 1 1 in, and a second plug-in element 22 which is integrated in the Bohrschaftabterrorism 12.
- the first and second plug-in element 21, 22 form a plug connection and are secured additional Lich via a rotary connection.
- the rotary joint comprises a plurality of pin elements 23 which are inserted into slot-shaped recesses 24.
- the pin elements 23 are attached to an outer side of the second plug-in element 22 and the slot-shaped Ausneh rules 24 are provided in the first plug-in element 21.
- the cutting section 1 1 can be easily and quickly connected to the Bohrschaftabêt 12 by the operator.
- the cutting portion 1 1 is inserted with the first plug-in element 21 on the second plug-in element 22 of the Bohrschaftabêtes 12, that the pin elements 23 are arranged in the slot-shaped recesses 24.
- the drill bit 10 is driven by a core drill in a rotational direction 25 about a rotation axis 26, wherein the rotation axis 26 coincides with a longitudinal axis of the rohrför shaped drill shank 17.
- the drill bit 10 is moved along a feed direction 27 in a workpiece 28, wherein the feed direction 27 is parallel to the axis of rotation 26.
- the drill bit 10 generates in the workpiece 28 a borehole 31 with a borehole diameter di_ and a boring core 32 with a core diameter CIK.
- the drill segments 15 form a drill ring having an outer diameter corresponding to the borehole diameter di_, and an inner diameter corresponding to the core diameter d K.
- FIGS. 2A-C show the cutting portion 1 1 of FIG. 1 with the first closed tube element 14, the second closed tube element 15 and the drill segments 16 in a longitudinal section along the section line A-A in FIG. 1 A.
- FIG. 2B shows the first closed tubular element 14 and FIG. 2C the second closed tube element 15 of the cutting section 1 1.
- the cutting portion 1 1 is made of the first closed tube member 14, the second closed tube member 15 and the drill segments 16.
- the drilling segments 16 are connected to the first closed tubular element 14 and to the second closed tubular element 15.
- the drill segments 16 can be welded to the first ge closed tubular element 14 and the second closed tubular element 15, soldered, screwed or connected in another suitable fastening.
- the first closed tubular element 14 is designed in the form of a first hollow cylinder with an annular cross-sectional area.
- the first closed tubular element 14 comprises a first outer lateral surface 41, a first inner lateral surface 42, a first lower end surface 43 and a first upper end surface 44.
- the dimensions of the first ge connected tubular element 14 are by a first hollow cylinder height Hi, a first In nen pressmesser di and a first outer diameter Di defined.
- the width of the first closed tubular element 14 results as half the difference between the first outside diameter Di and the first inside diameter di and is referred to as the first width Bi.
- the second closed tube element 15 is designed in the form of a second hollow cylinder with an annular cross-sectional area.
- the second closed tubular element 15 comprises a second outer lateral surface 45, a second inner lateral surface 46, a two te lower end surface 47 and a second upper end surface 48.
- the dimensions of the second closed tubular element 15 are by a second hollow cylinder height H 2 , a two-th inner diameter d 2 and a second outer diameter D 2 defined.
- the width of the second closed tubular element 15 results as half the difference of the second outer diameter D 2 and the second inner diameter d 2 and is referred to as the second width B 2 .
- the first lower end face 43 of the first closed tubular element 14 and the second lower end face 47 of the second closed tubular element 15 are aligned flush.
- the flush alignment of the first lower end surface 43 and the second lower end surface 47 has the advantage that a wide connection surface for the Bohrsegmente 16 is formed at which the Bohrsegmente 16 can be connected to the first closed tube member 14 and the second closed tube member 15. If the
- Drill segments 16 are connected to the first lower end face 43 and the second lower end face 47, the first closed tube member 14 and the second ge connected tube member 15 can be connected simultaneously with the Bohrsegmenten 16. Depending on the material thicknesses used, it may be necessary that the first closed-tube element 14 and the second closed tube element 15 are additionally connected with one another.
- the cutting portion 1 1 is constructed so that the power transmission from Bohrschaftab section 12 on the cutting section 1 1 via the first closed tubular element 14 and the torque transmission from the Bohrschaftabites 12 on the cutting section 1 1 via the second closed tubular element 15 takes place.
- the first upper end face 44 of the first closed tubular element 14 forms on the inside of the cutting section 1 1 an annular stop shoulder 49 for the transmission of power from a connected Bohrschaftabêt.
- the second closed tubular element 15 of the cutting section 1 1 has a plurality of slot-shaped recesses 24 on the second upper end face 48.
- the slot-shaped recesses 24 each comprise a transverse slot 51 and a connecting slot 52, wherein the connecting slot 52 connects the transverse slot 51 with the second upper end face 48.
- the first closed tubular element 14 may be made of a first material and the second ge closed tubular element 15 made of a second material.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Drilling Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17209448.4A EP3501711A1 (en) | 2017-12-21 | 2017-12-21 | Method for producing a cutting section for a core bit |
PCT/EP2018/085141 WO2019121474A1 (en) | 2017-12-21 | 2018-12-17 | Method for producing a cutting section for a drill bit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3727733A1 true EP3727733A1 (en) | 2020-10-28 |
Family
ID=60781846
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17209448.4A Withdrawn EP3501711A1 (en) | 2017-12-21 | 2017-12-21 | Method for producing a cutting section for a core bit |
EP18815261.5A Pending EP3727733A1 (en) | 2017-12-21 | 2018-12-17 | Method for producing a cutting section for a drill bit |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17209448.4A Withdrawn EP3501711A1 (en) | 2017-12-21 | 2017-12-21 | Method for producing a cutting section for a core bit |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP3501711A1 (en) |
WO (1) | WO2019121474A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1374214A (en) * | 1963-11-15 | 1964-10-02 | Diamant Boart Sa | Method and machine for boring or drilling a soil |
GB1583860A (en) * | 1976-08-20 | 1981-02-04 | Moppes & Sons Ltd L Van | Core drills |
SU914193A1 (en) * | 1980-01-24 | 1982-03-23 | Valerij S Belovol | Method and drill for trepanning holes |
DE4031755A1 (en) * | 1990-10-06 | 1992-04-09 | Bosch Gmbh Robert | HOLLOW DRILLING TOOL |
EP2745966A1 (en) * | 2012-12-21 | 2014-06-25 | HILTI Aktiengesellschaft | Annular drill bit with a replaceable cutting section |
EP2745964A1 (en) | 2012-12-21 | 2014-06-25 | HILTI Aktiengesellschaft | Cutting section |
-
2017
- 2017-12-21 EP EP17209448.4A patent/EP3501711A1/en not_active Withdrawn
-
2018
- 2018-12-17 EP EP18815261.5A patent/EP3727733A1/en active Pending
- 2018-12-17 WO PCT/EP2018/085141 patent/WO2019121474A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3501711A1 (en) | 2019-06-26 |
WO2019121474A1 (en) | 2019-06-27 |
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