DE612696C - Process for renewing worn steel molds for centrifugally cast pipes - Google Patents

Process for renewing worn steel molds for centrifugally cast pipes

Info

Publication number
DE612696C
DE612696C DEV27270D DEV0027270D DE612696C DE 612696 C DE612696 C DE 612696C DE V27270 D DEV27270 D DE V27270D DE V0027270 D DEV0027270 D DE V0027270D DE 612696 C DE612696 C DE 612696C
Authority
DE
Germany
Prior art keywords
steel molds
centrifugally cast
worn steel
cast pipes
molds
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
DEV27270D
Other languages
German (de)
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.)
Vereinigte Stahlwerke AG
Original Assignee
Vereinigte Stahlwerke 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 Vereinigte Stahlwerke AG filed Critical Vereinigte Stahlwerke AG
Priority to DEV27270D priority Critical patent/DE612696C/en
Application granted granted Critical
Publication of DE612696C publication Critical patent/DE612696C/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
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/101—Moulds

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Description

Verfahren zur Erneuerung abgenutzter Stahlkokillen für Schleudergußrohre Es ist bekannt, abgenutzte Stahlkokillen, welche zum Gießen von Schleudergußrohren dienen, durch einen auf ihre Außenfläche wirkenden Druck in ihrem Hohlquerschnitt zu verringern. Diese Behandlung der Kokillen in kaltem Zustande muß aber zur Überanstrengung des Materials führen und die Lebensdauer der Kokille, welche beim Gießen durch Wärmespannungen ungemein beansprucht wird, verkürzen. Man hat auch vorgeschlagen, durch einen Zieh- oder Walzprozeß *den Hohlquerschnitt zu verdichten. Ein homogenes Material kann aber dadurch nicht erreicht werden, weil der Zieh- oder Walzvorgang bei abgenutzten Kokillen notwendig zu örtlichen Überanstrengungen führen muß. Solche Überanstrengungen. können auch auftreten, wenn die Kokillen in kaltem Zustande gereckt werden, um ihren Hohlquerschnitt zu verringern. Nach der Erfindung werden. die abgenutzten Kokillen zwecks Verengung warm gepreßt oder geschmiedet. Dadurch kann man beim nachherigen Ausbohren mit Sicherheit gesundes Material erreichen und somit das Material wieder vollständig verwerten. Das Schmieden und Pressen kann Über einem Dorn geschehen oder auch in deiner Matrize.Process for the renewal of worn steel molds for centrifugally cast pipes It is known, worn steel molds, which are used for casting centrifugal cast pipes serve by a pressure acting on their outer surface in their hollow cross-section to reduce. This treatment of the molds in the cold state must, however, lead to overexertion of the material and the service life of the mold, which is caused by thermal stresses during casting is extremely stressed, shorten. It has also been suggested that a or rolling process * to compact the hollow cross-section. A homogeneous material can but this cannot be achieved because the drawing or rolling process when worn Mold must necessarily lead to local overexertion. Such overexertion. can also occur when the molds are stretched in the cold state to their Reduce hollow cross-section. According to the invention. the worn out molds hot-pressed or forged for narrowing purposes. This can be used afterwards Drilling out can be sure to reach healthy material and thus the material again fully utilize. Forging and pressing can be done over a mandrel or in your die.

Claims (1)

PATENTANSPRUCH: Verfahren zur Erneuerung abgenutzter Stahlkokillen für Schleuderguß:rohre durch Verengen ihrer Lichtweite und nachfolgendes Ausbohren, dadurch gekennzeichnet, da,ß die Kokillen zwecks Verengung warm gepreßt oder geschmiedet werden.PATENT CLAIM: Process for the renewal of worn steel molds for centrifugal casting: pipes by narrowing their clear width and subsequent boring, characterized in that, ß the molds are hot-pressed or forged for the purpose of narrowing will.
DEV27270D 1931-09-02 1931-09-02 Process for renewing worn steel molds for centrifugally cast pipes Expired DE612696C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEV27270D DE612696C (en) 1931-09-02 1931-09-02 Process for renewing worn steel molds for centrifugally cast pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV27270D DE612696C (en) 1931-09-02 1931-09-02 Process for renewing worn steel molds for centrifugally cast pipes

Publications (1)

Publication Number Publication Date
DE612696C true DE612696C (en) 1935-05-02

Family

ID=7583271

Family Applications (1)

Application Number Title Priority Date Filing Date
DEV27270D Expired DE612696C (en) 1931-09-02 1931-09-02 Process for renewing worn steel molds for centrifugally cast pipes

Country Status (1)

Country Link
DE (1) DE612696C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748061C (en) * 1941-10-18 1944-10-25 Process for the production of stress-free steel centrifugal casting molds

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748061C (en) * 1941-10-18 1944-10-25 Process for the production of stress-free steel centrifugal casting molds

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