DE668086C - Process for the production of hollow drill steel - Google Patents

Process for the production of hollow drill steel

Info

Publication number
DE668086C
DE668086C DEST52152D DEST052152D DE668086C DE 668086 C DE668086 C DE 668086C DE ST52152 D DEST52152 D DE ST52152D DE ST052152 D DEST052152 D DE ST052152D DE 668086 C DE668086 C DE 668086C
Authority
DE
Germany
Prior art keywords
core
hollow drill
production
drill steel
steel
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
Application number
DEST52152D
Other languages
German (de)
Inventor
Wilhelm Stich
Original Assignee
Wilhelm Stich Dr Ing
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 Wilhelm Stich Dr Ing filed Critical Wilhelm Stich Dr Ing
Priority to DEST52152D priority Critical patent/DE668086C/en
Priority to DE1936ST056904 priority patent/DE696854C/en
Application granted granted Critical
Publication of DE668086C publication Critical patent/DE668086C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling

Description

Verfahren zur Herstellung von Hohlbohrstahl Es ist bekannt, Hohlbohrstahl über einen runden Metallkern auf verschiedene Weise zu erzeugen. Dabei suchte man die Schwierigkeiten des Kernentfernens durch verschiedene Maßnahmen zu beseitigen. So wurde für den Kern ein austenitischer Stahl vorgeschlagen oder bei Verwendung anderer Stähle die Einschaltung einer besonderen Wärmebehandlung. Auch versuchte man den Kern elektrisch aufzuwärmen oder zwischen Kern und Stahlstück spiralig aufgewickelte Asbeststreifen und Rohre einzuschalten. Alle diese Maßnahmen beheben aber den Mangel der Schwierigkeit des Kernherausziehens nicht oder gestalten diese Arbeit unwirtschaftlich.Method for producing hollow drill steel It is known, hollow drill steel using a round metal core in various ways. One looked for to eliminate the difficulties of core removal by various means. An austenitic steel has been proposed for the core or when used other steels the inclusion of a special heat treatment. Also tried the core is heated up electrically or spirally wound between the core and the piece of steel Turn on asbestos strips and pipes. However, all of these measures correct the deficiency the difficulty of pulling out the core or make this work uneconomical.

Demgegenüber wird gemäß der Erfindung das Stahlstück, in welches der Kern vor dem Walzen eingesetzt wird, außen konisch ausgebildet. Dadurch wird der Kern beim Walzen konisch verformt und kann entgegen seiner Konizität leicht herausgezogen werden.In contrast, according to the invention, the piece of steel in which the Core is used before rolling, conical on the outside. This will make the Core deforms conically during rolling and can be easily pulled out against its conicity will.

In der Zeichnung enthält das konische Stahlstück- a (Abb. i) den zylindrischen Kern b. Beim Walzen wird aus dem konischen Stück eine außen zylindrische Walzader a1 (Abb. z). Der Kern bi jedoch wird konisch. Er kann nun leicht entgegen seiner Konizität entfernt werden. Längere Walzadern werden vorher in Stücke zerteilt.In the drawing, the conical piece of steel - a (Fig. I) contains the cylindrical one Core b. When rolling, the conical piece becomes an externally cylindrical rolling wire a1 (Fig. z). The core bi, however, becomes conical. He can now easily contradict himself Conicity can be removed. Longer veins are cut into pieces beforehand.

Claims (1)

PATRNTANSPRUCI3: Verfahren zur Herstellung von Hohlbohrstahlstangen aus einem Stahlstück mit zylindrischem Kern, dadurch gekennzeichnet, daß zum Zwecke des konischen Verform,ens des Kernes beim Walzen das Stahlstück (a), in welches der Kern vor dem Walzen eingesetzt wird, außen konisch ausgebildet ist.PATRNTANSPRUCI3: Process for the production of hollow drill steel bars from a piece of steel with a cylindrical core, characterized in that for the purpose of the conical deformation, ens of the core when rolling the piece of steel (a) into which the core is inserted before rolling, is conical on the outside.
DEST52152D 1934-05-01 1934-05-01 Process for the production of hollow drill steel Expired DE668086C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEST52152D DE668086C (en) 1934-05-01 1934-05-01 Process for the production of hollow drill steel
DE1936ST056904 DE696854C (en) 1934-05-01 1936-01-28 Process for the production of hollow drill steel rods from a piece of steel with a cylindrical core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST52152D DE668086C (en) 1934-05-01 1934-05-01 Process for the production of hollow drill steel

Publications (1)

Publication Number Publication Date
DE668086C true DE668086C (en) 1938-11-25

Family

ID=39942404

Family Applications (1)

Application Number Title Priority Date Filing Date
DEST52152D Expired DE668086C (en) 1934-05-01 1934-05-01 Process for the production of hollow drill steel

Country Status (1)

Country Link
DE (1) DE668086C (en)

Similar Documents

Publication Publication Date Title
DE668086C (en) Process for the production of hollow drill steel
AT201373B (en) Process for producing a connection between thermoplastic plastic pipes
DE1935357A1 (en) Method of manufacturing ribbed metal pipe
DE464276C (en) Manufacture of pipe flanges, welded collars, etc. like
DE666861C (en) Process for the production of hardened glass sheets of any size
DE620127C (en) Method of making hollow metal rods and the like the like, e.g. Hollow steel for rock drill
DE518709C (en) Multi-walled metal pipe, in particular made of corrosion-resistant layers alternating with tensile (iron) layers
DE378451C (en) Process for the production of roller baskets
DE468882C (en) Manufacture of pipes with reinforced ends
DE663868C (en) Process for the production of welding electrodes provided with a core from a sheet metal bent like a tube
DE560936C (en) Process for the production of metal coil sockets, especially for metal coils in the textile industry
DE505014C (en) Method for forming floors on drums by drawing-in
DE478028C (en) Method for stretching hollow metal bodies
AT141462B (en) Method of making hollow metal rods and the like like
DE559583C (en) Process for the production of hollow drill steels
DE539083C (en) Process for the production of hollow drilling steels
AT125156B (en) Process for producing collars on hollow drills.
DE884933C (en) Process for the production of single or multilayer metal pipes
AT220574B (en) Process for the production of steel bars or profiles made of iron or steel alloys by rolling
DE625799C (en) Process for the production of hollow turbine blades by stretching out a filled hollow work piece of a length which is relatively small to the length of the finished blade
DE805646C (en) Pipe, in particular flushing or blow-off pipe
AT72966B (en) Method of making horseshoe sticks.
AT131411B (en) Manufacture of hollow metal bars, rods and the like like
DE589607C (en) Process for the manufacture of cylindrical wire screws of very small diameter from very fine wires
DE620971C (en) Process for the manufacture of drain pipes