US3593773A - Method and apparatus for supervising casting of steel tubes - Google Patents

Method and apparatus for supervising casting of steel tubes Download PDF

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Publication number
US3593773A
US3593773A US830296A US3593773DA US3593773A US 3593773 A US3593773 A US 3593773A US 830296 A US830296 A US 830296A US 3593773D A US3593773D A US 3593773DA US 3593773 A US3593773 A US 3593773A
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United States
Prior art keywords
tube
pressure
water
interior
set forth
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Expired - Lifetime
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US830296A
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English (en)
Inventor
Gerd Vogt
Josef Glaser
Manfred Strohschein
Johannes Kurth
Rudolf Schwitzgobel
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Vodafone GmbH
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Mannesmann AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould

Definitions

  • the present invention relates to a method and equipment for improving the continuous casting of steel tubes which are cooled from the interior by spraying water onto the inner surface of a tube when leaving the die, and more particularly the invention relates to supervision of such casting process.
  • the rods or tubes are only partially solidified as they leave the die. In fact, there is barely a solid shell or mantle while the interior is still liquidous. The solid portion grows in thickness with increasing distance of tubing from the die, but even at an appreciable distancefrom the die the interior of the tube walls, or even more so the interior of a rod, is still in the liquid state. The cross-sectional dimension of this liquid core decreases until the entire tube or rod has solidified remote from the die. It is now possible, however, that the already solidified portion of the tube or rod cracks and that some of the still liquidous in terior core pours out and over tube, die and other casting equipment. It is needless to say that should such cracking occur, it interrupts operation and renders considerable portions of the cast tube or rod unusable.
  • FIG. i there is illustrated somewhat schematically a cross section through a continuous casting equipment for the casting of steel tubes.
  • FIG. 2 illustrates a modification of the equipment shown in FIG. ll.
  • the equipment illustrated in FIG. ll includes a water-cooled die member I having a die cavity which actually has ringshaped configuration; because a water-cooled, hollow mandrel 2 projects centrally into the die cavity.
  • Liquid steel is fed into the die from a container or hopper 111 having an aperture Ila which can be closed by a movable plug or stopper element 10.
  • a continuous hollow product, i.e., a cast tube 3 leaves the bottom die, i.e., the steel normally continuously pouring from hopper 11 into die 11 leaves the bottom thereof as a formed tube 3.
  • Tube 3 when directly leaving the die is only partially solidified by operation of the cooling process involving die and mandrel.
  • the tube has initially very thin solid wall portions 312; there is an inner wall portion forming a thin tube and circumscribing the hollow interior of tube 3 and there is an outer wall portion also forming a thin tube.
  • These two wall portions 3b are separated by an essentially ringshaped liquid core 3a.
  • core 3a is reduced in cross-sectional dimension and vanishes when inner and outer portions 3b merge at large distance from the die.
  • the interior wall of the tube, particularly the inner surface of the cylindrical cavity defined by the tube is cooled by continuously spraying water through nozzles 5.
  • Water is fed to nozzles 5 through a pipe 4 which traverses the hollow mandrel 2 and is'under control ofa valve 112 for controlling the amount of water supplied to the nozzles.
  • the water is directly sprayed onto the hot inner surface of the tube and partially vaporizes. Water vapor thus produced escapes from the interior of tube 3 through the hollow flow space of mandrel 2 communicating on one end with tube 3 and being on the other end connected to a steam pipe 6.
  • a suction device 7 sucks steam from pipe 6 to be discharged in the surrounding atmosphere.
  • a measuring or sensing pipe 8 likewise traverses the hollow space of mandrel 2 and extends down into the region where the tube 3 leaves the die.
  • the pipe 3 opens particularly to the zone adjacent the inner surface of the tube upon which coolant is sprayed.
  • Measuring and probing pipe 8 is connected to a pressure measuring instrument It outside of the steam zone.
  • pressure instrument 9 could also be connected directly to the pipe 6 for purposes of monitoring the pressure therein as representation of the pressure in the interior of mandrel 2 and in the space defined by the interior of tube 3.
  • instrument 9 During normal operation and for a constant rate of water flow as passing through pipe 4 and nozzles 5 for spraying, instrument 9 will indicate a constant value. The value is particularly determined by the rate of spray water flow and by the relative low pressure in pipe 6. Should the pressure increase suddenly, instrument 9 will respond immediately. lf the casting process itself did not change, nor was there any change in the flow of cooling and spray water then such pressure increase clearly represents that a crack is about to form and is in the initial state of formation. After the pressure increase has been detected, the casting process is changed so that further increase of a crack is impeded.
  • Such an impediment can be produced in a controlled manner as follows:
  • the pressure in the spray zone as monitored by probing pipe 8 acts upon an adjusting piston 13. It may be advisable to interpose, for example, a fluid amplifier in the connection path between probing pipe 8 and adjusting element 13. This way the control can be conducted at a particular characteristic as to when steel flow from hopper 11 is to be interrupted.
  • the piston 13 may normally be in retracted position but is then actuated as a result of an increase in pressure of probing pipe 8.
  • Piston l3 actuates a lever 14 which in turn moves stopper toward a more closing position.
  • the lever 14 is balanced by a weight 15 such that the stopper 10 is retracted from hopper opening 11a so that casting proceeds at a particular speed and rate of steel flow. Should the pressure in pipe 8 exceed a particular value causing piston 13 to be actuated, stopper 10 drops and the steel supply is diminished or even interrupted.
  • a pressure responsive transducer 23 is connected to probe 8 responding to the pressure therein operating a control box 24 which in turn causes valve 12 to throttle the amount of water in case the steam pressure increases. If a threshold pressure value is exceeded, the spray water flow is turned off completely.
  • a method of supervising the continuous casting of steel tubes which are cooled in the interior during casting by spraying of water comprising the steps of:
  • control step including throttling of the water supply for spraying, upon sudden increase of the pressure.
  • control of the casting process including the step of controlling the supply of liquid steel for the casting process.
  • Apparatus for supervising the continuous casting of steel tubes which includes means for cooling the cast tubes in the respective interior by spraying of water, comprising:
  • the means for measuring including a probing pipe extending into the interior of the cast tube.
  • the apparatus further including means for spraying cooling water onto the inner surface of the cast tube, the improvement comprising:
  • second means operatively connected to the first means to retard the casting process in response to development of pressure indicative ofa crack forming in the tube.
  • the second means including means for controlling the flow of liquid steel into the die cavity.
  • the means included in the second means stopping flow of liquid steel into the die cavity when the steam pressure exceeds a particular value.
  • the third means throttling the flow of spray water when the pressure exceeds a danger limit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US830296A 1968-06-07 1969-06-04 Method and apparatus for supervising casting of steel tubes Expired - Lifetime US3593773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1758466A DE1758466C3 (de) 1968-06-07 1968-06-07 Verfahren zum Stranggießen von Hohlsträngen

Publications (1)

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US3593773A true US3593773A (en) 1971-07-20

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Family Applications (1)

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US830296A Expired - Lifetime US3593773A (en) 1968-06-07 1969-06-04 Method and apparatus for supervising casting of steel tubes

Country Status (7)

Country Link
US (1) US3593773A (enrdf_load_stackoverflow)
AT (1) AT282090B (enrdf_load_stackoverflow)
BE (1) BE733639A (enrdf_load_stackoverflow)
DE (1) DE1758466C3 (enrdf_load_stackoverflow)
FR (1) FR2011906A1 (enrdf_load_stackoverflow)
GB (1) GB1228071A (enrdf_load_stackoverflow)
SE (1) SE342755B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178982A (en) * 1977-10-28 1979-12-18 Gus Sevastakis Method and apparatus for continuously casting hollow bars
US4257472A (en) * 1979-07-30 1981-03-24 Concast Incorporated Continuous casting of hollow shapes
US4546816A (en) * 1981-02-11 1985-10-15 Schwarz Gerhard E Method and apparatus of continuously casting hollow round billets with a hypocycloidal mandrel and an inside rolling process
WO1989011364A1 (en) * 1988-05-26 1989-11-30 Usx Engineers And Consultants, Inc. Continuous caster breakout damage avoidance system
WO1997016273A1 (en) * 1995-11-02 1997-05-09 Comalco Aluminium Limited Bleed out detector for direct chill casting
US6446704B1 (en) * 1997-06-27 2002-09-10 Richard J. Collins Continuous casting mold plug activation and bleedout detection system
CN108580820A (zh) * 2018-06-19 2018-09-28 沈阳麒飞新型材料科技有限公司 一种薄壁环形坯设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836328A1 (de) * 1988-10-25 1990-04-26 Emitec Emissionstechnologie Verfahren zur herstellung von einzelnocken aus gusswerkstoff
CN106166602A (zh) * 2016-07-30 2016-11-30 沈阳瑞鸿能源环保科技有限公司 一种冷却器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2145438A (en) * 1937-08-25 1939-01-31 Chase Brass & Copper Co Safety mechanism for continuous casting apparatus
US2853754A (en) * 1957-07-17 1958-09-30 Dow Chemical Co Continuous hollow casting
US3327761A (en) * 1964-10-19 1967-06-27 Technical Marketing Associates Fuel safety shut-off apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2145438A (en) * 1937-08-25 1939-01-31 Chase Brass & Copper Co Safety mechanism for continuous casting apparatus
US2853754A (en) * 1957-07-17 1958-09-30 Dow Chemical Co Continuous hollow casting
US3327761A (en) * 1964-10-19 1967-06-27 Technical Marketing Associates Fuel safety shut-off apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178982A (en) * 1977-10-28 1979-12-18 Gus Sevastakis Method and apparatus for continuously casting hollow bars
US4257472A (en) * 1979-07-30 1981-03-24 Concast Incorporated Continuous casting of hollow shapes
US4546816A (en) * 1981-02-11 1985-10-15 Schwarz Gerhard E Method and apparatus of continuously casting hollow round billets with a hypocycloidal mandrel and an inside rolling process
WO1989011364A1 (en) * 1988-05-26 1989-11-30 Usx Engineers And Consultants, Inc. Continuous caster breakout damage avoidance system
WO1997016273A1 (en) * 1995-11-02 1997-05-09 Comalco Aluminium Limited Bleed out detector for direct chill casting
US6279645B1 (en) * 1995-11-02 2001-08-28 Comalco Aluminum Limited Bleed out detector for direct chill casting
US6446704B1 (en) * 1997-06-27 2002-09-10 Richard J. Collins Continuous casting mold plug activation and bleedout detection system
CN108580820A (zh) * 2018-06-19 2018-09-28 沈阳麒飞新型材料科技有限公司 一种薄壁环形坯设备

Also Published As

Publication number Publication date
FR2011906A1 (enrdf_load_stackoverflow) 1970-03-13
DE1758466B2 (de) 1975-03-20
DE1758466A1 (de) 1971-01-28
SE342755B (enrdf_load_stackoverflow) 1972-02-21
DE1758466C3 (de) 1975-11-13
GB1228071A (enrdf_load_stackoverflow) 1971-04-15
AT282090B (de) 1970-06-10
BE733639A (enrdf_load_stackoverflow) 1969-11-03

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