EP0280835A1 - Hollow drill tool - Google Patents
Hollow drill tool Download PDFInfo
- Publication number
- EP0280835A1 EP0280835A1 EP19870810686 EP87810686A EP0280835A1 EP 0280835 A1 EP0280835 A1 EP 0280835A1 EP 19870810686 EP19870810686 EP 19870810686 EP 87810686 A EP87810686 A EP 87810686A EP 0280835 A1 EP0280835 A1 EP 0280835A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting segments
- surface layer
- hollow drill
- diamond grain
- carrier body
- 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- Withdrawn
Links
- 239000002344 surface layer Substances 0.000 claims abstract description 27
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 20
- 239000010432 diamond Substances 0.000 claims abstract description 20
- 238000005553 drilling Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
Definitions
- the invention relates to a hollow drill with a hollow cylindrical carrier body, on the drilling direction side open end of which the end face and the circumferential contour of the carrier body projecting cutting segments containing diamond grain are arranged.
- a hollow drill with cutting segments containing diamond grain is known from AT-PS 373 196.
- the cutting segments sit on the end face of a hollow cylindrical support body and have an end face pointing in the direction of drilling and an outer contour curved in a circular arc in the axial projection of the hollow drill and concentrically projecting over the circumferential contour of the support body.
- the diamond grain which is distributed in an embedding material, is not only inside the cutting segments, but is partly exposed to the end face and the outer contour.
- the cutting segments with the end face remove material from the material to be machined, for example concrete, natural stone, brick, to create a borehole.
- the outer contour of the cutting segments slides along the wall of the borehole that is being created, thereby causing the hollow drill bit to be guided laterally.
- This not only results in axial shortening, but also in radial cutting of the cutting segments from the outer contour.
- the radial cutting of the cutting segments takes place to such a high degree that after just a few drilling operations, only holes with a greatly reduced diameter are created.
- the drill holes intended to receive them must therefore only be subject to slight fluctuations in diameter. So the acceptable deviation from the ideal diameter is in the range of tenths of a millimeter. Approximately half of this deviation alone takes up the manufacturing tolerances of the hollow drill, so that there is only a very small margin available for the permissible radial removal of the cutting segments.
- the invention has for its object to provide a hollow drill with cutting segments containing diamond grain, with which a large number of holes can be made with high diameter accuracy.
- the object is achieved in that the cutting segments have a surface layer which extends concentrically to the circumferential contour of the carrier body and has a higher diamond grain concentration than the remaining area of the cutting segments.
- the surface layer with an increased diamond grain concentration extends at least over a part of the outer contour of the cutting segments that projects beyond the peripheral contour of the carrier body. Due to the higher diamond grain concentration, the wear resistance of the surface layer is significantly higher than the wear resistance of the remaining area of the cutting segments. This leads to more extensive radial dimensional accuracy of the cutting segments, so that a large number of drill holes with high diameter accuracy can be produced.
- Particularly high wear resistance is preferably achieved in that the extent of the surface layer measured in the circumferential direction corresponds to that of the cutting segments.
- the extent of the surface layer measured in the axial direction of the drill also corresponds to that of the cutting segments according to a further proposal of the invention.
- the extent of the surface layer measured in the axial direction of the drill exceeds the extent of the cutting segments measured in the axial direction and projecting beyond the end face of the carrier body. This design is particularly suitable for workpieces with high strength to improve the radial dimensional accuracy of the cutting segments.
- the section of the surface layer set back relative to the end face of the carrier body can be fixed on the circumferential contour of the carrier body or can be supported and held by an extension connected to the remaining area of the cutting segments.
- the recessed section of the surface layer can ensure high radial dimensional accuracy of the cutting segments up to the complete axial shortening of the part of the cutting segments projecting beyond the end face of the carrier body.
- the diamond grain concentration in the surface layer preferably corresponds to two to five times the diamond grain concentration in the remaining region of the cutting segments.
- the surface layer advantageously has a thickness of 0.2 to 1 mm. In addition to sufficient wear resistance of the surface layer, this ensures that the surface layer together with the end face of the cutting segments is gradually removed axially without the surface layer adversely affecting the drilling behavior.
- the hollow drill designated as a whole by 1, consists of a hollow cylindrical carrier body 2 with a drive shaft 3 molded onto the end facing away from the drilling direction and project radially beyond the circumferential contour of the carrier body 2.
- the cutting segments 4 have an end face 6 pointing in the drilling direction and a surface layer 7 which extends concentrically to the circumferential contour of the carrier body 2 and which also extends counter to the drilling direction and then to the end face 5 along the circumferential contour of the carrier body 2 with a section 8.
- the Cutting segments 4 consist of an embedding material, for example cobalt with metallic additives such as copper, tin, zinc, tungsten, in which diamond grain 9 is embedded in a spatially distributed manner.
- the diamond grain concentration is two to five times the remaining area of the cutting segments 4, as shown in FIG. 2.
- the thickness of the surface layer 7 is 0.2 to 1 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling Tools (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
Die Erfindung betrifft einen Hohlbohrer mit einem hohlzylindrischen Trägerkörper, an dessen bohrrichtungsseitigem offenen Ende die Stirnseite und die Umfangskontur des Trägerkörpers überragende, Diamantkorn enthaltende Schneidsegmente angeordnet sind.The invention relates to a hollow drill with a hollow cylindrical carrier body, on the drilling direction side open end of which the end face and the circumferential contour of the carrier body projecting cutting segments containing diamond grain are arranged.
Aus der AT-PS 373 196 ist ein Hohlbohrer mit Diamantkorn enthaltenden Schneidsegmenten bekannt. Die Schneidsegmente sitzen auf der Stirnseite eines hohlzylindrischen Trägerkörpers und verfügen über eine in Bohrrichtung weisende Stirnfläche sowie über eine in der Axialprojektion des Hohlbohrers kreisbogenförmig gekrümmte, die Umfangskontur des Trägerkörpers konzentrisch überragende Aussenkontur. Das in einem Einbettungsmaterial verteilt gelagerte Diamantkorn befindet sich nicht nur im Innern der Schneidsegmente, sondern liegt teilweise zur Stirnfläche und zur Aussenkontur hin frei.A hollow drill with cutting segments containing diamond grain is known from AT-PS 373 196. The cutting segments sit on the end face of a hollow cylindrical support body and have an end face pointing in the direction of drilling and an outer contour curved in a circular arc in the axial projection of the hollow drill and concentrically projecting over the circumferential contour of the support body. The diamond grain, which is distributed in an embedding material, is not only inside the cutting segments, but is partly exposed to the end face and the outer contour.
Im Arbeitseinsatz des Hohlbohrers tragen die Schneidsegmente mit der Stirnfläche zur Schaffung eines Bohrloches kreisringförmig Material vom Bearbeitungsgut, zB Beton, Naturstein, Ziegel, ab. Die Aussenkontur der Schneidsegmente gleitet dabei entlang der Wandung des entstehenden Bohrloches, wodurch eine seitliche Führung des Hohlbohrers bewirkt wird. So kommt es im Arbeitseinsatz verschleissbedingt nicht nur zur axialen Verkürzung, sondern auch zum radialen Abbau der Schneidsegmente von der Aussenkontur her. Der radiale Abbau der Schneidsegmente erfolgt dabei in einem so hohen Masse, dass schon nach wenigen Bohrvorgängen nur mehr Bohrlöcher mit stark verkleinertem Durchmesser entstehen.When working with the hollow drill, the cutting segments with the end face remove material from the material to be machined, for example concrete, natural stone, brick, to create a borehole. The outer contour of the cutting segments slides along the wall of the borehole that is being created, thereby causing the hollow drill bit to be guided laterally. As a result of wear and tear, this not only results in axial shortening, but also in radial cutting of the cutting segments from the outer contour. The radial cutting of the cutting segments takes place to such a high degree that after just a few drilling operations, only holes with a greatly reduced diameter are created.
Diese Massabweichung ist unerheblich, wenn die Bohrlöcher beispielsweise nur zum Durchführen von Rohren oder durch Nebeneinanderreihung solcher Bohrlöcher zur Herstellung eines Durchbruches dienen sollen. Dagegen sind Bohrlöcher mit solcherart verkleinertem Durchmesser für die Aufnahme mechanischer Dübel ungeeignet, da die Dübel in die Bohrlöcher nur erschwert oder gar nicht einführbar sind. Es ist aber auch nicht möglich, zur Umgehung dieses Problems Hohlbohrer mit einem im Neuzustand vergrösserten Bohrdurchmesser zu verwenden, da so vorerst übergrosse Bohrlöcher entstehen würden, was wiederum den Verankerungswert der Dübel beeinträchtigt.This dimensional deviation is irrelevant if the boreholes are only to be used, for example, to pass through pipes or, by lining up such boreholes, to produce an opening. In contrast, boreholes with such a reduced diameter are for the recording Mechanical anchors are unsuitable because the anchors are difficult to insert into the drill holes or cannot be inserted at all. However, it is also not possible to use hollow drills with a larger bore diameter when new to circumvent this problem, since this would initially result in oversized drill holes, which in turn would affect the anchorage value of the dowels.
Zur Gewährleistung guter Einführbarkeit und hoher Verankerungswerte von Dübeln dürfen die zu deren Aufnahme vorgesehenen Bohrlöcher demgemäss nur geringen Durchmesserschwankungen unterliegen. So bewegt sich die akzeptable Abweichung vom idealen Durchmesser im Bereich von Zehntelmillimetern. Circa die Hälfte dieser Abweichung nehmen allein die Herstellungstoleranzen des Hohlbohrers in Anspruch, so dass für den zulässigen radialen Abbau der Schneidsegmente nur noch ein sehr kleiner Spielraum zur Verfügung steht.To ensure good insertability and high anchoring values for dowels, the drill holes intended to receive them must therefore only be subject to slight fluctuations in diameter. So the acceptable deviation from the ideal diameter is in the range of tenths of a millimeter. Approximately half of this deviation alone takes up the manufacturing tolerances of the hollow drill, so that there is only a very small margin available for the permissible radial removal of the cutting segments.
Der Erfindung liegt die Aufgabe zugrunde, einen Hohlbohrer mit Diamantkorn enthaltenden Schneidsegmenten zu schaffen, mit dem sich eine grosse Anzahl Bohrlöcher von hoher Durchmessergenauigkeit herstellen lässt.The invention has for its object to provide a hollow drill with cutting segments containing diamond grain, with which a large number of holes can be made with high diameter accuracy.
Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass die Schneidsegmente eine sich konzentrisch zur Umfangskontur des Trägerkörpers erstreckende Oberflächenschicht mit einer gegenüber dem übrigen Bereich der Schneidsegmente höheren Diamantkorn-Konzentration aufweisen.According to the invention, the object is achieved in that the cutting segments have a surface layer which extends concentrically to the circumferential contour of the carrier body and has a higher diamond grain concentration than the remaining area of the cutting segments.
Die Oberflächenschicht mit erhöhter Diamantkorn-Konzentration erstreckt sich zumindest über einen Teil der die Umfangskontur des Trägerkörpers überragenden Aussenkontur der Schneidsegmente. Die Verschleissfestigkeit der Oberflächenschicht liegt aufgrund der höheren Diamantkorn- Konzentration erheblich über der Verschleissfestigkeit des übrigen Bereiches der Schneidsegmente. Dies führt zu weitgehender radialer Masshaltigkeit der Schneidsegmente, so dass eine grosse Anzahl Bohrlöcher von hoher Durchmessergenauigkeit hergestellt werden kann.The surface layer with an increased diamond grain concentration extends at least over a part of the outer contour of the cutting segments that projects beyond the peripheral contour of the carrier body. Due to the higher diamond grain concentration, the wear resistance of the surface layer is significantly higher than the wear resistance of the remaining area of the cutting segments. This leads to more extensive radial dimensional accuracy of the cutting segments, so that a large number of drill holes with high diameter accuracy can be produced.
Besonders hohe Verschleissfestigkeit wird vorzugsweise erzielt, indem die in Umfangsrichtung gemessene Erstreckung der Oberflächenschicht derjenigen der Schneidsegmente entspricht.Particularly high wear resistance is preferably achieved in that the extent of the surface layer measured in the circumferential direction corresponds to that of the cutting segments.
Zur Erhöhung der Verschleissfestigkeit entspricht ferner die in Achsrichtung des Bohrers gemessene Erstreckung der Oberflächenschicht, nach einem weiteren Vorschlag der Erfindung, derjenigen der Schneidsegmente.To increase the wear resistance, the extent of the surface layer measured in the axial direction of the drill also corresponds to that of the cutting segments according to a further proposal of the invention.
In Weiterbildung der Erfindung übersteigt die in Achsrichtung des Bohrers gemessene Erstreckung der Oberflächenschicht die in Achsrichtung gemessene, die Stirnseite des Trägerkörpers überragende Erstreckung der Schneidsegmente. Insbesondere für Bearbeitungsgut mit hoher Festigkeit eignet sich diese Ausbildung zur Verbesserung der radialen Masshaltigkeit der Schneidsegmente.In a further development of the invention, the extent of the surface layer measured in the axial direction of the drill exceeds the extent of the cutting segments measured in the axial direction and projecting beyond the end face of the carrier body. This design is particularly suitable for workpieces with high strength to improve the radial dimensional accuracy of the cutting segments.
Der gegenüber der Stirnseite des Trägerkörpers zurückversetzte Abschnitt der Oberflächenschicht kann auf der Umfangskontur des Trägerkörpers festgelegt oder durch einen mit dem übrigen Bereich der Schneidsegmente verbundenen Fortsatz hinterstützt und gehalten sein. Durch einen solchen entgegen der Bohrrichtung sich an die Stirnseite des Trägerkörpers anschliessenden Abschnitt der Oberflächenschicht wird die der seitlichen Führung des Hohlbohrers dienende Oberflächenschicht insgesamt grossflächiger, woraus sich eine Steuerungsmöglichkeit bezüglich der erforderlichen Diamantkorn-Konzentration in der Oberflächenschicht insgesamt ergibt. Vor allem kann durch den zurückversetzten Abschnitt der Oberflächenschicht bis zur vollständigen axialen Verkürzung des die Stirnseite des Trägerkörpers überragenden Teiles der Schneidsegmente hohe radiale Masshaltigkeit der Schneidsegmente gewährleistet werden.The section of the surface layer set back relative to the end face of the carrier body can be fixed on the circumferential contour of the carrier body or can be supported and held by an extension connected to the remaining area of the cutting segments. Such a section of the surface layer, which adjoins the end face of the carrier body against the direction of drilling, makes the surface layer serving for lateral guidance of the hollow drill overall more extensive, which results in a possibility of controlling the required diamond grain concentration in the surface layer as a whole. Above all, the recessed section of the surface layer can ensure high radial dimensional accuracy of the cutting segments up to the complete axial shortening of the part of the cutting segments projecting beyond the end face of the carrier body.
Vorzugsweise entspricht die Diamantkorn-Konzentration in der Oberflächenschicht dem Zwei- bis Fünffachen der Diamantkorn-Konzentration im übrigen Bereich der Schneidsegmente. Mit höherer Festigkeit des Bearbeitungsgutes wird eine höhere, in der voran angegebenen Bandbreite liegende Diamantkorn-Konzentration gewählt.The diamond grain concentration in the surface layer preferably corresponds to two to five times the diamond grain concentration in the remaining region of the cutting segments. The higher the strength of the processed material, the higher the diamond grain concentration in the range specified above is chosen.
Mit Vorteil weist die Oberflächenschicht eine Dicke von 0,2 bis 1 mm auf. Damit wird nebst ausreichender Verschleissfestigkeit der Oberflächenschicht gewährleistet, dass die Oberflächenschicht zusammen mit der Stirnfläche der Schneidsegmente sukzessive axial mitabgetragen wird, ohne dass die Oberflächenschicht das Bohrverhalten nachteilig beeinflusst.The surface layer advantageously has a thickness of 0.2 to 1 mm. In addition to sufficient wear resistance of the surface layer, this ensures that the surface layer together with the end face of the cutting segments is gradually removed axially without the surface layer adversely affecting the drilling behavior.
Die Erfindung wird nachstehend anhand einer Zeichnung, die ein Ausführungsbeispiel wiedergibt, näher erläutert. Es zeigen:
- Fig. 1 einen Hohlbohrer in perspektivischer Darstellung;
- Fig. 2 eine vergrösserte Detail-Ansicht auf die Stirnseite des Hohlbohrers gemäss Fig. 1.
- Figure 1 shows a hollow drill in a perspective view.
- FIG. 2 shows an enlarged detail view of the end face of the hollow drill according to FIG. 1.
Der insgesamt mit 1 bezeichnete Hohlbohrer besteht aus einem hohlzylindrischen Trägerkörper 2 mit einem an dem der Bohrrichtung abgewandten Ende angeformten Antriebsschaft 3. Auf dem in Bohrrichtung weisenden offenen Ende des Trägerkörpers 2 sitzen vier insgesamt mit 4 bezeichnete Schneidsegmente, welche die Stirnseite 5 des Trägerkörpers 2 axial und die Umfangskontur des Trägerkörpers 2 radial überragen.The hollow drill, designated as a whole by 1, consists of a hollow cylindrical carrier body 2 with a
Die Schneidsegmente 4 verfügen über eine in Bohrrichtung weisende Stirnfläche 6 und über eine sich konzentrisch zur Umfangskontur des Trägerkörpers 2 erstreckende Oberflächenschicht 7, welche sich auch entgegen der Bohrrichtung, anschliessend an die Stirnseite 5 entlang der Umfangskontur des Trägerkörpers 2 mit einem Abschnitt 8 erstreckt. Die Schneidsegmente 4 bestehen aus einem Einbettungsmaterial, zB Kobalt mit metallischen Zusätzen wie Kupfer, Zinn, Zink, Wolfram, in welchem Diamantkorn 9 räumlich verteilt eingebettet ist. In der Oberflächenschicht 7 beträgt die Diamantkorn-Konzentration das Zwei- bis Fünffache des übrigen Bereichs der Schneidsegmente 4, wie dies die Fig. 2 verdeutlicht. Die Dicke der Oberflächenschicht 7 beträgt 0,2 bis 1 mm.The cutting segments 4 have an
Zufolge der grösseren Diamantkorn-Konzentration in der Oberflächenschicht 7 wird hohe radiale Verschleissfestigkeit der Schneidsegmente 4 erzielt, so dass mit dem Hohlbohrer 1 eine grosse Anzahl Bohrlöcher von hoher Durchmessergenauigkeit hergestellt werden kann.As a result of the greater diamond grain concentration in the
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3706641 | 1987-03-02 | ||
DE19873706641 DE3706641A1 (en) | 1987-03-02 | 1987-03-02 | HOLLOW DRILL |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0280835A1 true EP0280835A1 (en) | 1988-09-07 |
Family
ID=6322084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870810686 Withdrawn EP0280835A1 (en) | 1987-03-02 | 1987-11-23 | Hollow drill tool |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0280835A1 (en) |
JP (1) | JPS63230306A (en) |
AU (1) | AU1125488A (en) |
DE (1) | DE3706641A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0363313A2 (en) * | 1988-10-05 | 1990-04-11 | HILTI Aktiengesellschaft | Hollow stone-drilling tool |
WO1990015683A1 (en) * | 1989-06-14 | 1990-12-27 | Tyrolit Schleifmittelwerke Swarovski K.G. | Hollow drill |
EP0514822A1 (en) * | 1991-05-23 | 1992-11-25 | FRIEDRICH BUSSE DIAMANTWERKZEUGE GmbH + Co. | Tool for working concrete or similar materials |
EP0857552A2 (en) * | 1997-01-27 | 1998-08-12 | Tyrolit Schleifmittelwerke Swarovski KG | Stone cutting element with increased wear resistance |
GB2423540A (en) * | 2005-02-24 | 2006-08-30 | Marcrist Internat Ltd | Core drills and cutting discs |
GB2423538A (en) * | 2005-02-24 | 2006-08-30 | Marcrist Internat Ltd | Core drilling segments with side protection |
KR100968930B1 (en) | 2008-05-29 | 2010-07-14 | 가부시키 가이샤 미야나가 | Diamond Core Drill |
CN102059376A (en) * | 2010-12-15 | 2011-05-18 | 杨清韩 | Cylindrical hollow drilling tool |
DE202015104880U1 (en) | 2015-09-15 | 2015-11-03 | Jakob Lach Gmbh & Co. Kg | hollow drill |
CN106424855A (en) * | 2016-12-26 | 2017-02-22 | 王文胜 | Diamond bit |
CN110735602A (en) * | 2019-10-31 | 2020-01-31 | 广州晶体科技有限公司 | core bit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5429199A (en) * | 1992-08-26 | 1995-07-04 | Kennametal Inc. | Cutting bit and cutting insert |
JPH08155946A (en) * | 1994-11-30 | 1996-06-18 | Tone Corp | Inner and outer diameter part reinforced diamond bit and production thereof |
JP4785185B2 (en) * | 2005-12-27 | 2011-10-05 | 信越石英株式会社 | Inner hole processing method of hollow brittle material |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2167151B1 (en) * | 1970-04-08 | 1980-05-08 | Gen Electric | Process for producing a diamond-tipped cutting insert |
EP0102843A2 (en) * | 1982-09-06 | 1984-03-14 | De Beers Industrial Diamond Division (Proprietary) Limited | Tool inserts |
US4505251A (en) * | 1982-02-08 | 1985-03-19 | Martin Stoll | Cutting segment with porous center section |
DE3408092A1 (en) * | 1984-03-05 | 1985-09-19 | Hilti Ag, Schaan | HOLLOW DRILL |
US4561810A (en) * | 1981-12-16 | 1985-12-31 | General Electric Company | Bi-level cutting insert |
US4610579A (en) * | 1984-05-31 | 1986-09-09 | Ppg Industries, Inc. | Core drill bit with dynamic cooling fluid flow control means |
-
1987
- 1987-03-02 DE DE19873706641 patent/DE3706641A1/en not_active Withdrawn
- 1987-11-23 EP EP19870810686 patent/EP0280835A1/en not_active Withdrawn
-
1988
- 1988-02-03 AU AU11254/88A patent/AU1125488A/en not_active Abandoned
- 1988-03-01 JP JP4596488A patent/JPS63230306A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2167151B1 (en) * | 1970-04-08 | 1980-05-08 | Gen Electric | Process for producing a diamond-tipped cutting insert |
US4561810A (en) * | 1981-12-16 | 1985-12-31 | General Electric Company | Bi-level cutting insert |
US4505251A (en) * | 1982-02-08 | 1985-03-19 | Martin Stoll | Cutting segment with porous center section |
EP0102843A2 (en) * | 1982-09-06 | 1984-03-14 | De Beers Industrial Diamond Division (Proprietary) Limited | Tool inserts |
DE3408092A1 (en) * | 1984-03-05 | 1985-09-19 | Hilti Ag, Schaan | HOLLOW DRILL |
US4610579A (en) * | 1984-05-31 | 1986-09-09 | Ppg Industries, Inc. | Core drill bit with dynamic cooling fluid flow control means |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0363313A2 (en) * | 1988-10-05 | 1990-04-11 | HILTI Aktiengesellschaft | Hollow stone-drilling tool |
EP0363313A3 (en) * | 1988-10-05 | 1990-12-27 | Hilti Aktiengesellschaft | Hollow stone-drilling tool |
WO1990015683A1 (en) * | 1989-06-14 | 1990-12-27 | Tyrolit Schleifmittelwerke Swarovski K.G. | Hollow drill |
EP0514822A1 (en) * | 1991-05-23 | 1992-11-25 | FRIEDRICH BUSSE DIAMANTWERKZEUGE GmbH + Co. | Tool for working concrete or similar materials |
EP0857552A2 (en) * | 1997-01-27 | 1998-08-12 | Tyrolit Schleifmittelwerke Swarovski KG | Stone cutting element with increased wear resistance |
EP0857552A3 (en) * | 1997-01-27 | 2000-02-09 | Tyrolit Schleifmittelwerke Swarovski KG | Stone cutting element with increased wear resistance |
GB2423540A (en) * | 2005-02-24 | 2006-08-30 | Marcrist Internat Ltd | Core drills and cutting discs |
GB2423538A (en) * | 2005-02-24 | 2006-08-30 | Marcrist Internat Ltd | Core drilling segments with side protection |
GB2423537A (en) * | 2005-02-24 | 2006-08-30 | Marcrist Internat Ltd | Core drills |
KR100968930B1 (en) | 2008-05-29 | 2010-07-14 | 가부시키 가이샤 미야나가 | Diamond Core Drill |
CN102059376A (en) * | 2010-12-15 | 2011-05-18 | 杨清韩 | Cylindrical hollow drilling tool |
DE202015104880U1 (en) | 2015-09-15 | 2015-11-03 | Jakob Lach Gmbh & Co. Kg | hollow drill |
CN106424855A (en) * | 2016-12-26 | 2017-02-22 | 王文胜 | Diamond bit |
CN110735602A (en) * | 2019-10-31 | 2020-01-31 | 广州晶体科技有限公司 | core bit |
Also Published As
Publication number | Publication date |
---|---|
DE3706641A1 (en) | 1988-09-15 |
JPS63230306A (en) | 1988-09-26 |
AU1125488A (en) | 1988-09-01 |
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