DE2809291A1 - Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts - Google Patents

Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts

Info

Publication number
DE2809291A1
DE2809291A1 DE19782809291 DE2809291A DE2809291A1 DE 2809291 A1 DE2809291 A1 DE 2809291A1 DE 19782809291 DE19782809291 DE 19782809291 DE 2809291 A DE2809291 A DE 2809291A DE 2809291 A1 DE2809291 A1 DE 2809291A1
Authority
DE
Germany
Prior art keywords
drill
drill bit
brazed
surface hardened
reinforced concrete
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
Application number
DE19782809291
Other languages
German (de)
Inventor
Johannes Breiting
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19782809291 priority Critical patent/DE2809291A1/en
Priority to NO790638A priority patent/NO790638L/en
Priority to ES1979241721U priority patent/ES241721Y/en
Priority to DK86679A priority patent/DK86679A/en
Priority to JP2502379A priority patent/JPS54127092A/en
Publication of DE2809291A1 publication Critical patent/DE2809291A1/en
Pending 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
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The drill bit for drilling concrete can also penetrate steel reinforcement. The bit has a centre angle between 120 and 125 degrees and a setting angle between 10 and 15 degrees. The bits can be used also for glass, ceramics and similar materials provided the correct speed is selected. The drill operates satisfactorily for concrete at a speed of 2000 rpm, while with percussion action the drill should be operated at 100 rpm. The effectiveness of the bit is increased by providing the shaft with surface hardening which reduces vibration during drilling as well the detrimental effects of excess heat expansion.

Description

Hartmetallbestückter SpiralbohrerCarbide-tipped twist drill

Die Erfindung betrifft einen hartmetallbestückten Spiralbohrer, wie er bisher zur Bearbeitung von Grauguß, NE-Metallen, Glas, Porzellan, Gestein u.dgl. eingesetzt wurde.The invention relates to a carbide-tipped twist drill, such as he has so far been used to process gray cast iron, non-ferrous metals, glass, porcelain, stone and the like. was used.

Derartige Spiralbohrer haben bisher, je nachdem, welches Material zu bohren ist, verschiedene Spitzen- -und Freiwinkel.Such twist drills have so far, depending on the material to be drilled is different point and clearance angles.

Der Erfindung liegt die Aufgabe zugrunde, einen hartmetallbestückten Spiralbohrer zu schaffen, der als Allzweckbohrer sowohl Beton als auch den häufig im Beton zu Armierungszwecken verankerten Baustahl einwandfrei durchdringt.The invention is based on the object of a carbide-tipped Twist drill bit that is common as a general purpose drill bit both concrete and concrete Structural steel anchored in concrete for reinforcement purposes penetrates perfectly.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß an dem Bohrer Schneidenwinkel in folgenden Bereichen angeschliffen sind: 1200 < g C 125° (Spitzenwinkel) 100 { dX zu 150 (Freiwinkel).According to the invention this object is achieved in that on the drill Cutting angles are ground in the following areas: 1200 <g C 125 ° (point angle) 100 {dX to 150 (clearance angle).

Es hat sich gezeigt, daß Spiralbohrer mit diesen Schneidenwinkeln universell sowohl zum Bohren von Stählen als auch von Beton, Glas, Keramik u.dgl. verwendbar sind, wobei selbstverständlich die Drehzahl entsprechend dem zu bearbeitenden Material gewählt werden muß. Beton mit Armierung kann mit einem erfindungsgemäßen Spiralbohrer bei einer Drehzahl von etwa 2000 U/min gut bearbeitet werden; wird das Schlagbohren angewendet, so arbeitet man zweckmäßig mit einer Drehzahl von etwa 1000 U/min.It has been shown that twist drills with these cutting angles universal for drilling steels as well as concrete, glass, ceramics and the like. can be used, the speed of course corresponding to the one to be processed Material must be chosen. Concrete with reinforcement can with an inventive Twist drills can be machined well at a speed of about 2000 rpm; will impact drilling applied, it is expedient to work at a speed of about 1000 rpm.

Eine Steigerung der Zerspanungsleistung des erfindungsgemäßen Spiralbohrers wird nach einem weiteren Erfindungsgedanken dadurch erreicht, daß der Bohrerschaft oberflächengehärtet wird. Die Härte soll dabei zwischen 40 und 55 R c liegen. Diese Oberflächenhartung hat eine Erhöhung der Torsionssteifigkeit des Bohrerschaftes und damit eine Verringerung der Schwingungen des Bohrers während des Bohrvorganges zur Folge. Weiterhin wird durch die Oberflächenhärtung die Wärmedehnung des Bohrers im Bereich des Hartmetallplättchens herabgesetzt und derjenigen des Hartmetallplättchens angenähert, so daß schädliche Spannungen innerhalb der Lötstelle, wie sie aus stark unterschiedlichen Wärmedehnungen des Hartmetalls und des Bohrerschaftmaterials resultieren, abgebaut werden. Dem Ablösen des Hartmetallplättchens wird auf diese Weise entgegengewirkt.An increase in the cutting performance of the twist drill according to the invention is achieved according to a further inventive concept in that the drill shank is surface hardened. The hardness should be between 40 and 55 R c. These Surface hardening increases the torsional rigidity of the drill shank and thus a reduction the vibrations of the drill during of the drilling process. Furthermore, the surface hardening reduces the thermal expansion of the drill in the area of the hard metal plate and that of the Approximated hard metal plate, so that harmful tensions within the soldering point, as they are due to the vastly different thermal expansions of the hard metal and the drill shaft material result, be degraded. The detachment of the hard metal plate is due to this Way counteracted.

Da wegen der besonders hohen Bohrerleistung des erfindungsgemäßen Spiralbohrers an den Bohrer schneiden sehr hohe Temperaturen auftreten, wird in Ausgestaltung der Erfindung zur Befestigung des Hartmetallplättchens an dem Bohrerschaft ein Hartlot verwendet, dessen Hitzebeständigkeit ca. 10000 C beträgt, so daß ein Ausloten des Hartmetallplättchens nicht eintreten kann.Because of the particularly high drill performance of the invention Twist drill to cut the drill bit very high temperatures will occur in Embodiment of the invention for fastening the hard metal plate to the drill shank a hard solder is used, the heat resistance of which is about 10,000 C, so that a The hard metal plate cannot be plumbed out.

Claims (3)

Ansprüche: 1. Hartmetallbestückter Spiralbohrer, g e k e n n -z e i c h n e t durch folgende Schneidenwinkelbereiche: 1200 < # # 1250 (SpitzenwinkeD 100 < obC 150 (Freiwinkel). Claims: 1. Carbide-tipped twist drill, g e k e n n -z e i c h n e t through the following cutting edge angle ranges: 1200 <# # 1250 (point angleD 100 <obC 150 (clearance angle). 2. Bohrer nach Anspruch 1 oder 2, dadurch g e k e n n -z e i c h n e t , daß der Bohrerschaft oberflächengehärtet ist.2. Drill according to claim 1 or 2, characterized in that g e k e n n -z e i c h n e t that the drill shank is surface hardened. 3. Bohrer nach Anspruch 1 und 2, dadurch g e k e n n -z e i c h n e t , daß das Hartmetallplättchen mittels eines Hartlotes an dem Bohrerschaft befestigt ist, das eine Hitzebeständigkeit von ca. 10000 C hat.3. Drill according to claim 1 and 2, characterized in that g e k e n n -z e i c h n e t that the hard metal plate is attached to the drill shank by means of a hard solder which has a heat resistance of approx. 10000 C.
DE19782809291 1978-03-02 1978-03-02 Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts Pending DE2809291A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19782809291 DE2809291A1 (en) 1978-03-02 1978-03-02 Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts
NO790638A NO790638L (en) 1978-03-02 1979-02-26 CARBON METAL SPIRAL DRILL.
ES1979241721U ES241721Y (en) 1978-03-02 1979-02-28 SPIRAL DRILL PROVIDED WITH HARD METAL.
DK86679A DK86679A (en) 1978-03-02 1979-03-01 HARD METAL DRILL
JP2502379A JPS54127092A (en) 1978-03-02 1979-03-02 Cemented carbide drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782809291 DE2809291A1 (en) 1978-03-02 1978-03-02 Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts

Publications (1)

Publication Number Publication Date
DE2809291A1 true DE2809291A1 (en) 1979-09-06

Family

ID=6033522

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782809291 Pending DE2809291A1 (en) 1978-03-02 1978-03-02 Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts

Country Status (1)

Country Link
DE (1) DE2809291A1 (en)

Similar Documents

Publication Publication Date Title
DE60131729T2 (en) LONG ELEMENT AND STEEL FOR BANGING STONE DRILL
EP0633087B1 (en) Sawblade for sawing ductile ferrous materials
EP0169402B1 (en) Rock drill bit
DE69630842T2 (en) masonry drill
DE2619210A1 (en) STABILIZING DEVICE FOR A DRILL STRING
DE19528512C2 (en) Wear parts and process for their manufacture
EP0925881B1 (en) Tool
DE3743817C2 (en) Rock, drill and chisel tools
DE2930856A1 (en) DEVICE FOR DRILLING STONE
DE1527508B2 (en) PROCESS FOR HARDENING A CRANKSHAFT
DE3020284A1 (en) Rock-boring twist drill - has cruciform cutter head with two pairs of diametrally opposite lengthwise grooves
DE2442146A1 (en) Coal pick with hard metal tip - has conical tip of steel shaft carrying granular hard metal layer
DE2809291A1 (en) Tipped drill bit for reinforced concrete - has surface hardened shaft with brazed-on hard alloy cutting inserts
EP1348519A1 (en) Tool for abrasively cutting solid material
DE3538191C2 (en) Rock drill
DE2542001A1 (en) Drill for hard materials, esp. concrete - has hard surface layer and is suitable for do-it-yourself applications
EP0481952B1 (en) Replaceable wear part
EP0006417A1 (en) Twist drill with inserted cemented carbide tip
DE2423510A1 (en) ROCK DRILLS
DE2320011A1 (en) HIGH INTENSITY BALL PASTING
DE4008102A1 (en) Cutting-tool prodn. method - involves cutting insert with hard solder in vacuum chamber above hardening temp.
DE102005039036B3 (en) Tunnel boring cutter has mounting body with peripheral sectional cutting ring with hard metal inclusions
EP0207071A1 (en) Machine knife and process for its manufacture
DE2939572C2 (en) Process for remelt hardening of cast iron workpieces provided with a bore, as well as the application of this process to camshafts
DE2829847A1 (en) Steel chisel used in hammers for breaking concrete etc. - made by through hardening and tempering low alloy steel contg. chromium, molybdenum and vanadium

Legal Events

Date Code Title Description
OAP Request for examination filed
OD Request for examination
OHJ Non-payment of the annual fee