EHRHARDT PIERCING METHOD

申请公布号：JPS61219439(A)

申请号：JP19850062392

申请日期：1985.03.26

申请公布日期：1986.09.29

申请人：

SUMITOMO METAL IND LTD

发明人：UENO AKIRA;KAWANO KENJI

分类号：B21J5/10

主分类号：B21J5/10

摘要：PURPOSE:To eliminate the occurrence of the accident of the bend and breakage, etc. of a mandrel by upsetting with detecting the upsetting pressure and by stopping the pressure by the mandrel while the ascent of the detection pressure is stopped in case of producing a steel pipe from a bloom by Ehrhardt piercing method. CONSTITUTION:A heated bloom 1 is inputted into the container 2 having circular section and a upsetting plate 3 is placed thereon in case of producing a steel pipe by Ehrhardt method with the square billet of a bloom, etc. The bloom 1 is upsetted with pressure by the mandrel 5 fitted to the cross head 4 of a piercing machine via this upsetting plate 3. The upsetting is performed with detecting this upsetting pressure by pressure detector 7, the valve 8 for feeding pressure water 9 is closed while the ascent of the detecting pressure is virtually stopped, the feed of the pressure water 9 to a cylinder 6 is stopped and the band and breakage of the mandrel due to over-pressure are prevented.

BÜRSTE ZUR OBERFLÄCHENBEHANDLUNG VON MATERIALIEN

LANDWIRTSCHAFTLICHE UND GARTENBAULICHE ANTIBAKTERIELLE ZUSAMMENSETZUNGEN

STEROIDHALTIGES PFLASTER, VERFAHREN ZU SEINER HERSTELLUNG UND VERWENDUNG

AUS HOCHDURCHLÄSSIGEM POLYSILOXANPOLYOL HERGESTELLTE KONTAKTLINSEN

FUNGIZIDE MISCHUNGEN AUF DER BASIS VON AMIDVERBINDUNGEN

BEHANDLUNG DER SYMPTOME DER PARKINSONSCHEN KRANKHEIT MIT EINEM MITTEL ENTHALTEND EINE DOPAMINERGE SUBSTANZ UND EIN LOKALANAESTHETIKUM DER ANILID-GRUPPE

APPARECCHIO DI ILLUMINAZIONE PER STRUTTURE MODULARI EDILI O STRADALI, QUALI PARETI, PAVIMENTAZIONI O SIMILI E METODO PER LA REALIZZAZIONE

VERFAHREN, VERMITTLUNGSSTELLE, GEBÜHRENRECHNER, GEBÜHRENABRECHNUNGSRECHNER UND PROGRAMM-MODULE ZUR VERARBEITUNG VON GEBÜHRENDATEN FÜR TELEKOMMUNIKATIONS-DIENSTLEISTUNGEN

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PROCEDIMENTO PER LA RICRISTALLIZZAZIONE IN LINEA DI NASTRI GREZZI DI SOLIDIFICAZIONE IN ACCIAI AL CARBONIO E IN ACCIAI BASSO LEGATI E NASTRI

MICROPAT-MICRONIZZATORE DI PRINCIPI ATTIVI, FARMACI, COSMETICI MODELLO PROTOTIPO SPERIMENTALE.

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