DE861005C - Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting - Google Patents

Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting

Info

Publication number
DE861005C
DE861005C DEB5083D DEB0005083D DE861005C DE 861005 C DE861005 C DE 861005C DE B5083 D DEB5083 D DE B5083D DE B0005083 D DEB0005083 D DE B0005083D DE 861005 C DE861005 C DE 861005C
Authority
DE
Germany
Prior art keywords
free
crack
pore
hollow body
formation
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
DEB5083D
Other languages
German (de)
Inventor
Hermann Dr-Ing Schenck
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.)
GUSSSTAHLWERK BOCHUMER VER AG
Original Assignee
GUSSSTAHLWERK BOCHUMER VER AG
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 GUSSSTAHLWERK BOCHUMER VER AG filed Critical GUSSSTAHLWERK BOCHUMER VER AG
Priority to DEB5083D priority Critical patent/DE861005C/en
Application granted granted Critical
Publication of DE861005C publication Critical patent/DE861005C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills

Description

Verfahren zur Bildung von pofen- und rissefreien Oberflächen eines im Schleudergießverfahren gegossenen Hohlkörpers Die meisten Legierungswerkstoffe gefährden den Stahl in der Weise, daß: die Oberflächen eines hieraus angefertigten Werkstückes., insbesondere nach einer Wärmebehandlung, Risse aufweisen. Auch neigen verschiedene Stähle zu Seigerungserscheinungen, die ebenfalls einen Anlaß zu Rißbildungen nach dem Härten geben.Process for the formation of pore-free and crack-free surfaces of a Centrifugal cast hollow body Most alloy materials endanger the steel in such a way that: the surfaces of something made from it Workpiece., In particular after a heat treatment, have cracks. Also tend different steels cause segregation, which also gives rise to cracking give after hardening.

Um nun vällig pofen- und rissefreie Oberflächen zu bilden, schlägt die Erfindung ein einfaches Mittel vor, indem sie von der Anwendung des Verbundschlewdergießeus ausgeht. Das Wesen der Erfindung kennzeichnet sich dadurch, daß vor und/oder nach dem Gießen der legierten Stahlschmelze eine niedriglegierte oder urlegierte Stahlschmelze eingeschleudert wird. Wird vor oder nach dem Einschleudern der legierten Stahlschmelze dem Gießstrahl eine schwachlegierte oder urlegierte Stahlschmelze zugegeben, so findet eine Diffusion zwischen den beiden Stahlarten statt. Diese Diffusion hat zur Folge, daß Seigerungen auch bei hierzu neigenden Legierungselementen von vornherein vermieden werden. Es bereitet wegen der Stahlzusammensetzung der äußeren Schicht des gegossenen Hohlkörpers. keine besonderen Schwierigkeiten, die zusätzlich eingeschleuderte Stahlschicht durch eine geeignete spanabhebende Bearbeitung abzunehmen. Das hat zur Folge., daß das nunmehr entstandene Werkstück eine Oberfläche aufweist, die völlig poren-und rissefrei ist. Es liegt im Sinn der Erfindung, für die zusätzlich aufgetragene Schicht einen solchen Stahl zu verwenden, der sich leicht zerspanen läßt. Es ist auch möglich, für den sinngemäßen Schutzmantel windgefrischten Stahl zu verwenden.In order to create surfaces that are completely free of pores and cracks, suggests the invention provides a simple means by avoiding the use of composite gravel pouring goes out. The essence of the invention is characterized in that before and / or after pouring the alloyed steel melt, a low-alloyed or non-alloyed steel melt is thrown in. Used before or after the alloyed steel melt is injected a weakly alloyed or unalloyed steel melt is added to the pouring stream, see above diffusion takes place between the two types of steel. This diffusion has As a result, segregation from the outset even with alloying elements that tend to do so be avoided. It prepares the outer layer because of the steel composition of the cast hollow body. no particular difficulties thrown in additionally Removal of the steel layer by suitable machining. That has result. That the workpiece now created has a surface that is completely free of pores and cracks. It is in the spirit of the invention to use such a steel for the additionally applied layer, which is can be easily machined. It is also possible to wind-freshened for the analogous protective coat Use steel.

Das- Verfahren gemäß der Erfindung eignet sich insbesondere für die Herstellung von Geschützrohren od. dgl. Hohlkörpern. Bei einem solchen Anwendungsbeispiel wird am Ende des Schleudervorganges dem Gießstrahl die niedriglegierte oder unlegierte Stahlschmelze zugegeben, die auch aus windgefrischtenn Stahl bestehen kann. Das Einschleudern. der genannten Schutzschicht am Ende des Schleudervorganges hat zur Folge, daß Seigerungserscheinungen bzw. Anreicherungen von Legierungswerkstoffen in der Bohrung des Geschützrohres von vornherein vermieden werden, so daß bei der nachfolgenden spanabhebenden Bearbeitung und Wärmebehandlung eine völlig poren-und rissefreie Oberfläche entstehen muß.The method according to the invention is particularly suitable for Manufacture of gun barrels or the like. Hollow bodies. In such an application example At the end of the spinning process, the pouring stream will be the low-alloyed or unalloyed Molten steel added, which can also consist of wind-freshened steel. That Throwing in. the protective layer mentioned at the end of the spinning process has to Consequence that segregation or accumulation of alloy materials be avoided in the bore of the gun barrel from the start, so that in the subsequent machining and heat treatment a completely pore and crack-free surface must arise.

Claims (1)

PATENTANSPRÜCHE: r. Verfahren zur Bildung von poren- und rissefreien Oberflächen eines im Schleuderverfahren gegossenen Hohlkörpers, dadurch gekennzeichnet, daß vor und/oder nach dem Gießen der legierten Stahlschmelze eine niedriglegierte oder unlegierte Stahlschmelze eingeschleudert wird. a. Verfahren nach Anspruch z, dadurch gekennzeichnet, daß für die niedri@glegierte oder unlegierte Stahlschmelze windgefrischter Stahl Verwendung findet. 3. Anwendung des Verfahrens nach Anspruch r oder a zur Herstellung von Geschützrohren:PATENT CLAIMS: r. Process for the formation of pore-free and crack-free Surfaces of a hollow body cast in a centrifugal process, characterized in that that before and / or after the casting of the alloyed steel melt, a low-alloyed one or unalloyed steel melt is thrown in. a. Method according to claim z, characterized in that for the low alloyed or unalloyed steel melt wind-cooled steel is used. 3. Application of the method according to claim r or a for the manufacture of gun barrels:
DEB5083D 1944-09-07 1944-09-07 Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting Expired DE861005C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB5083D DE861005C (en) 1944-09-07 1944-09-07 Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB5083D DE861005C (en) 1944-09-07 1944-09-07 Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting

Publications (1)

Publication Number Publication Date
DE861005C true DE861005C (en) 1952-12-29

Family

ID=6953858

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB5083D Expired DE861005C (en) 1944-09-07 1944-09-07 Process for the formation of pore-free and crack-free surfaces of a hollow body cast by centrifugal casting

Country Status (1)

Country Link
DE (1) DE861005C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282864B (en) * 1963-03-11 1968-11-14 Black Company Process for centrifugal casting
DE1296750B (en) * 1964-06-02 1969-06-04 Babcock & Wilcox Co Process for the production of metallic centrifugal cast hollow bodies
DE2230317A1 (en) * 1971-06-22 1973-01-11 Secr Defence Brit METHOD OF CASTING METAL OBJECTS
EP0335012A1 (en) * 1988-03-08 1989-10-04 Karl-Hermann Busse Method for continuously producing a wear resistant metal-hard material composite by centrifugal casting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282864B (en) * 1963-03-11 1968-11-14 Black Company Process for centrifugal casting
DE1296750B (en) * 1964-06-02 1969-06-04 Babcock & Wilcox Co Process for the production of metallic centrifugal cast hollow bodies
DE2230317A1 (en) * 1971-06-22 1973-01-11 Secr Defence Brit METHOD OF CASTING METAL OBJECTS
EP0335012A1 (en) * 1988-03-08 1989-10-04 Karl-Hermann Busse Method for continuously producing a wear resistant metal-hard material composite by centrifugal casting

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