EP0340340B1 - Method for the production of a diamond-core bit - Google Patents
Method for the production of a diamond-core bit Download PDFInfo
- Publication number
- EP0340340B1 EP0340340B1 EP88119262A EP88119262A EP0340340B1 EP 0340340 B1 EP0340340 B1 EP 0340340B1 EP 88119262 A EP88119262 A EP 88119262A EP 88119262 A EP88119262 A EP 88119262A EP 0340340 B1 EP0340340 B1 EP 0340340B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- face
- tube
- cutting segments
- wall
- wall thickness
- 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
Links
Images
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
- 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen oder Neubestücken eines Diamant-Kernbohrer in Rohrform, dessen Stirnseite eine größere Wanddicke aufweist als die übrige Rohrwand, um auf der ringförmigen Stirnseite Schneidsegmente zu tragen.The invention relates to a method for producing or refitting a diamond core drill in tubular form, the end face of which has a greater wall thickness than the rest of the tube wall, in order to carry cutting segments on the annular end face.
Ein solcher Diamant-Kernbohrer in Form einer Aufschraubkrone ist aus DE-A-2 850 015 bekannt. Bei diesem bekannten Kernbohrer werden in die Stirnseite axiale Einschnitte eingefräst, die durch gesinterte Diamantschichten mit dazwischen liegenden Abstandsschichten gefüllt werden. Diese Konstruktion erfordert einen hohen Herstellungsaufwand und der Kernbohrer weist eine große Wandungsstärke auf, so daß sehr viel Material durchbohrt werden muß.Such a diamond core drill in the form of a screw-on crown is known from DE-A-2 850 015. In this known core drill, axial incisions are milled into the end face, which are filled by sintered diamond layers with spacing layers in between. This construction requires a high manufacturing effort and the core drill has a large wall thickness, so that a lot of material has to be pierced.
Aus der schweizerischen Patentschrift 185076 und der britischen Patentschrift 601428 ist es bekannt das die Schneidsegmente tragende Ende eines Diamant-Kernbohrers mit verstärkter Wandung auszuführen, damit die Schneidsegmente genügend Halt finden. Nach dem Verschleiß der Schneidsegmente ist auch ein erheblicher Bereich der verdickten Wandung mit verschlissen, so daß eine erhebliche Länge des Kernbohrers im verdickten Bereich heruntergedreht werden muß ehe neue Segmente aufgesetzt werden können. Der Kernbohrer hat damit eine nur sehr kurze Lebensdauer.From the Swiss patent 185076 and the British patent 601428 it is known to design the end of a diamond core drill carrying the cutting segments with a reinforced wall so that the cutting segments find sufficient grip. After the cutting segments have worn, a considerable area of the thickened wall is also worn, so that a considerable length of the core drill in the thickened area must be turned down before new segments can be put on. The core drill thus has a very short lifespan.
Aus der JP-A-58 16 35 42 und der JP-A-57-127535 ist es an sich bekannt, bei einem Ölbohrrohr das Ende einer Stahlröhre in der Weise aufzustauchen, daß der Außendurchmesser größer wird und der Innendurchmesser gleich bleibt. Der durch den Bohrer herausgebohrte Kern reibt hierbei an der Bohrerinnenwand, so daß die Innenwand einem erheblchen Verschleiß ausgesetzt ist.From JP-A-58 16 35 42 and JP-A-57-127535 it is known per se to emerge the end of a steel tube in an oil drill pipe in such a way that the outside diameter becomes larger and the inside diameter remains the same. The core drilled out by the drill rubs against the inner wall of the drill so that the inner wall is exposed to considerable wear.
Aus der DE-A 3 742 496 ist es an sich bekannt, das Ende eines Stahlrohres durch Schmieden anzustauchen, um den Verbindungshalt zu einem zweiten Rohr zu verbessern.From DE-A 3 742 496 it is known per se to swage the end of a steel tube by forging in order to improve the connection hold to a second tube.
Aufgabe der Erfindung ist es, ein Verfahren zum Herstellen oder Neubestücken eines Diamant-Kernbohrers der eingangs genannten Art so zu verbessern, daß der Bohrer auf einfache und preiswerte Weise sehr häufig immer wieder mit Schneidsegmenten versehen werden kann und einem geringen Verschleiß unterliegt.The object of the invention is to improve a method for producing or refitting a diamond core drill of the type mentioned in such a way that the drill can be provided with cutting segments very often in a simple and inexpensive manner and is subject to little wear.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die größere Wanddicke im Rohr-Stirnbereich durch ein Aufstauchen, derart erfolgt, daß die Stirnseite sowohl an der Innenseite als auch an der Außenseite gegenüber der Rohrwandung vorsteht.This object is achieved in that the greater wall thickness in the tube end region is achieved by upsetting in such a way that the end side protrudes from the tube wall both on the inside and on the outside.
Ein solcher Kernbohrer bietet nicht nur einen ausreichenden Halt für die Schneidsegmente, sondern es ist auch sichergestellt, daß der herausgebohrte Kern an der Bohrerinnenwand nicht entlang schleift und einen erheblichen Verschleiß verursacht.Such a core drill not only offers sufficient hold for the cutting segments, but it is also ensured that the core drilled out does not drag along the inner wall of the drill and causes considerable wear.
Bei diesem Verfahren kann nach dem Verschleiß der Schneidsegmente das Rohr auf der schneidenden Stirnseite aufgrund des Verschleisses eine geringere Wanddicke aufweisen als für die Segmente erforderlich ist, da nach einem geringfügigen Glattdrehen oder Glattfräsen der Stirnseite, diese wieder aufgestaucht wird, bis sie eine genügende Wanddicke für die Schneidsegmente besitzt. Das Rohr kann damit über seine gesamte Länge eine gleichbleibende geringe Wanddicke aufweisen und braucht nur an dem schneidenden Ende soweit aufgestaucht zu werden, bis die Breite der Stirnfläche für ein Befestigen der Schneidsegmente groß genug ist. Damit wird nach dem Verschleiß des jeweiligen Schneidsegmentsatzes nur sehr wenig Rohrlänge verbraucht um wieder eine genügend breite Stirnfläche zu erhalten. Ein solches Verfahren ist verhältnismäßig wenig arbeitsaufwendig und preiswert. Darüberhinaus wird durch das Aufstauchen das Metall an der schneidenden Stirnseite verfestigt, so daß ein besonders sicherer Halt gegeben ist.In this method, after the cutting segments have worn, the tube on the cutting end face can have a smaller wall thickness than is required for the segments, since after a slight smooth turning or milling the end face, it is swaged up again until it has a sufficient wall thickness for which has cutting segments. The tube can thus have a constant small wall thickness over its entire length and only needs to be swaged up at the cutting end until the width of the end face is large enough for fastening the cutting segments. This is after Wear of the respective cutting segment set uses very little pipe length to get a sufficiently wide end face again. Such a method is relatively inexpensive and labor intensive. In addition, the metal is solidified on the cutting end face by the upsetting, so that there is a particularly secure hold.
Besonders vorteilhaft ist es, wenn auf der Rohrstirnseite mindestens eine Rolle unter Druck abläuft bis die für die Schneidsegmente erforderliche Wanddicke erreicht ist. Auch wird vorzugsweise vorgeschlagen, daß zum Neubestücken mit Schneidsegmenten die bisherigen verbrauchten Schneidsegmente von der Rohrstirnseite soweit vorhanden entfernt werden und die Rohrstirnseite um eine geringe Länge abgedreht oder abgefräst wird, und daß danach die Rohrstirnseite aufgestaucht wird.It is particularly advantageous if at least one roller runs under pressure on the tube end face until the wall thickness required for the cutting segments is reached. It is also preferably proposed that the existing used cutting segments be removed from the pipe end face as far as possible and that the pipe end face is turned or milled off by a small length for new equipping with cutting segments, and that the pipe end face is then swaged up.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen
Figur 1- einen Längsschnitt durch das Rohr,
Figur 2- eine Stirnansicht und
Figur 3- einen Ausschnitt aus
Figur 1 in vergrößertem Maßstab.
- Figure 1
- a longitudinal section through the pipe,
- Figure 2
- a front view and
- Figure 3
- a section of Figure 1 on an enlarged scale.
Das Rohr 1 eines Diamant-Kernbohrers ist am freien schneidenden Ende verdickt 1a ausgeführt, so daß die ringförmige Stirnseite 3 eine größere Dicke aufweist als die übrige Rohrwandung. Auf dieser Stirnseite 3 sind Diamant-Schneidsegmente 2 aufgelötet.The
Ehe die Schneidsegmente 2 befestigt werden, wird das Rohrende durch Rollen kalt verformend aufgestaucht. Hierzu wird mindestens eine Rolle radial zum Rohr gegen die Stirnseite 3 gestellt und auf die Stirnseite rollend gedrückt, wodurch das Rohrmaterial insbesondere der Stahl im Bereich 1a kalt verformt wird. Die Achse der verformenden Rolle ist dabei so angeordnet, daß sie die Rohrachse 7 schneidet. Die verformende Rolle kann einen zylindrischen oder aber auch einen balligen oder spitzen Rollenmantel besitzen, um die Verformung zu beschleunigen.Before the
Soll ein Bohrer mit Schneidsegmenten neubestückt werden, so muß nach Abnahme der restlichen verbrauchten Schneidsegmente die Rohrstirnseite nur um wenige Milimeter abgedreht oder abgefräst werden, wonach dann die Rohrstirnseite aufgestaucht wird.If a drill is to be re-equipped with cutting segments, then after removing the remaining used cutting segments, the tube end face only has to be turned or milled by a few millimeters, after which the tube end face is then swaged up.
Im aufgestauchten Bereich 1a bildet dieser sowohl am Innen- als auch Außendurchmesser 4, 6 einen Freiwinkel 5, so daß die Stirnseite 3 sowohl an der Innenseite als auch an der Außenseite gegenüber der Rohrwandung vorsteht. Damit ist sichergestellt, daß die Rohrwandung im nicht oder wenig verbreiterten Bereich einem Verschleiß nicht ausgesetzt ist.In the upset area 1a, this forms a clearance angle 5 on both the inside and
Claims (3)
- A method for the production or re-equipment of a diamond core bit in the form of a tube, whose end wall (3) has a larger wall thickness than the rest of the tube wall, in order to bear cutting segments (2) on the annular end face (3), characterized in that the greater wall thickness in the tube end zone (3, 4) is so produced by upsetting that the end face (3) projects in relation to the tube wall on both the inside and the outside.
- A method according to claim 1, characterized in that at least one roller runs under pressure down the tube end face (3) until the wall thickness required for the cutting segments (2) has been attained.
- A method according to claims 1 or 2, characterized in that for re-equipment with cutting segments (2) any previous used cutting segments (2) are removed from the tube end face (3), and the tube end face (3) is turned or milled off by a small length, whereafter the tube end face (3) is upset.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88119262T ATE91749T1 (en) | 1988-04-25 | 1988-11-19 | PROCESS FOR MAKING A DIAMOND CORE DRILL. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8805449U | 1988-04-25 | ||
DE8805449U DE8805449U1 (en) | 1988-04-25 | 1988-04-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0340340A1 EP0340340A1 (en) | 1989-11-08 |
EP0340340B1 true EP0340340B1 (en) | 1993-07-21 |
Family
ID=6823338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88119262A Expired - Lifetime EP0340340B1 (en) | 1988-04-25 | 1988-11-19 | Method for the production of a diamond-core bit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0340340B1 (en) |
AT (1) | ATE91749T1 (en) |
DE (2) | DE8805449U1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4436915A1 (en) * | 1994-10-15 | 1996-04-18 | Hilti Ag | Hollow core bit with a hollow cylindrical carrier body |
BE1013336A3 (en) * | 2000-03-01 | 2001-12-04 | Diamant Boart Nv | Tubular drill. |
DE10041911B4 (en) * | 2000-08-25 | 2009-02-05 | Hilti Aktiengesellschaft | diamond drill |
CN109352837B (en) * | 2018-10-25 | 2021-02-12 | 江苏锋泰工具有限公司 | Dry type TM tooth punching drill |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3802520A (en) * | 1972-02-16 | 1974-04-09 | L Whitman | Combination masonry diamond bit and metal hole-cutting saw |
US3981371A (en) * | 1975-06-06 | 1976-09-21 | Jamie Malcolm Wallis | Core sampling drill |
JPS57127535A (en) * | 1981-01-29 | 1982-08-07 | Kobe Steel Ltd | Upset forging method |
JPS58163542A (en) * | 1982-03-23 | 1983-09-28 | Sumitomo Metal Ind Ltd | Upsetting method of tube |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE199063C (en) * | ||||
US1996181A (en) * | 1930-11-01 | 1935-04-02 | Justin F Wait | Process of forming castings |
CH185076A (en) * | 1935-05-04 | 1936-07-15 | Sauer Carl | Core drill for masonry. |
GB601428A (en) * | 1945-06-18 | 1948-05-05 | Wheel Trueing Tool Company Of | Improvements in or relating to core bits |
US2796777A (en) * | 1953-05-06 | 1957-06-25 | Stoll Albert | Method and apparatus for resizing tools |
US3306380A (en) * | 1964-01-27 | 1967-02-28 | Gen Automation Mfg Inc | Core drill |
GB1583860A (en) * | 1976-08-20 | 1981-02-04 | Moppes & Sons Ltd L Van | Core drills |
CA1053938A (en) * | 1977-11-18 | 1979-05-08 | Robert E. Generoux | Drill bit |
DE3408092A1 (en) * | 1984-03-05 | 1985-09-19 | Hilti Ag, Schaan | HOLLOW DRILL |
DE3512114A1 (en) * | 1985-04-03 | 1986-10-09 | Meissner, Joachim | Hollow drill bit |
JPS63149038A (en) * | 1986-12-15 | 1988-06-21 | Nippon Steel Corp | Method for working steel pipe end part by outer upsetting press |
-
1988
- 1988-04-25 DE DE8805449U patent/DE8805449U1/de not_active Expired
- 1988-11-19 DE DE88119262T patent/DE3882520D1/de not_active Expired - Fee Related
- 1988-11-19 EP EP88119262A patent/EP0340340B1/en not_active Expired - Lifetime
- 1988-11-19 AT AT88119262T patent/ATE91749T1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3802520A (en) * | 1972-02-16 | 1974-04-09 | L Whitman | Combination masonry diamond bit and metal hole-cutting saw |
US3981371A (en) * | 1975-06-06 | 1976-09-21 | Jamie Malcolm Wallis | Core sampling drill |
JPS57127535A (en) * | 1981-01-29 | 1982-08-07 | Kobe Steel Ltd | Upset forging method |
JPS58163542A (en) * | 1982-03-23 | 1983-09-28 | Sumitomo Metal Ind Ltd | Upsetting method of tube |
Also Published As
Publication number | Publication date |
---|---|
EP0340340A1 (en) | 1989-11-08 |
DE3882520D1 (en) | 1993-08-26 |
ATE91749T1 (en) | 1993-08-15 |
DE8805449U1 (en) | 1988-06-09 |
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