US3734166A - Apparatus for continuously casting tubes - Google Patents

Apparatus for continuously casting tubes Download PDF

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Publication number
US3734166A
US3734166A US00061701A US3734166DA US3734166A US 3734166 A US3734166 A US 3734166A US 00061701 A US00061701 A US 00061701A US 3734166D A US3734166D A US 3734166DA US 3734166 A US3734166 A US 3734166A
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US
United States
Prior art keywords
mandrel
mold
accordance
tube
wall
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Expired - Lifetime
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US00061701A
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English (en)
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A Wertli
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Individual
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Individual
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • 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

Definitions

  • I ABSTRACT In apparatus for the continuous casting of tubing the core mandrel is hollowed for a portion of its length with the wall thickness of the hollowed portion progressively decreasing in the direction of withdrawal of the cast tube.
  • the shape of the hollowed portion can be varied to control the flow of heat through the mandrel to produce the desired effect on the solidification process.
  • a cooling fluid can be supplied to the mandrel cavity, if desired.
  • This invention relates to the continuous casting of tubes, and more particularly to apparatus for the continuous casting of tubes from metals such as cast iron, copper, and copper alloys.
  • Apparatus for continuous casting of metal tubes is well known and in its usual form comprises an elongated hollow mold connected at one end to and serving as the outlet of a furnace for supplying molten metal to be cast.
  • a mandrel is positioned coaxially within the mold to serve as a core.
  • the annular space between the outer surface of the mandrel and the inner surface of the mold thus becomes a conduit for the molten metal flowing from the furnace.
  • the lengths of the mold and mandrel must be sufficient so that the molten metal will have solidified before leaving the other end of the mold.
  • the outside of the mold is usually surrounded by a cooling means, such as a circulating water jacket.
  • the invention provides apparatus for continuous casting of tubes by means of an elongated wall defining the hollow mold and coaxial inner core mandrel connected to a furnace for supplying molten metal in which the mandrel is hollow for a portion of its length, with the thickness of the wall defining the hollow portion or cavity progressively decreasing in the direction of withdrawal of the cast tube.
  • This hollow mandrel design makes it possible in a simple manner to establish both. the distribution and also the magnitude of the heat flow in such a way that most of the heat from the mandrel passes into the cooling device in the solidification zone, because the narrowing of the heat conductive cross-section alongthe mandrel leads to a concentration of the heat flow into the solidification zone. Thereby, no bread-out of the melt can occur, which has a favorable effect on both the economics and operating safety of the apparatus.
  • the heat transfer into the inner wall of the casting can be influenced to achieve any desired effect on the solidification process such as, for example, on the graphite formation when casting iron.
  • a considerable increase in the casting speed can be achieved by reducing the heat transfer withan appropriately shaped hollow mandrel.
  • speeds up to about 100 cm/min. can be achieved.
  • peratures of the melt with resulting changes in the heat flow may cause an outward displacement of the solidification zone and lead to a break-out of the melt through the outer end of the mold.
  • the even distribution of heat flow over the entire mandrel surface also may have an adverse effect on the metallurgical changes which occur during the solidification process as, for example, on the graphite formation when casting iron.
  • the FIGURE schematically represents a vertical section through a part of a continuouscasting apparatus according to the invention.
  • an elongated hollow mold 1 having a cylindrical core mandrel 2 positioned coaxially therein is mounted at one end in the wall of a holding furnace 3 and extends outwardly therefrom.
  • the mandrel 2 has a support flange atits inner end which fits into a corresponding recess in the mold 1 and has spaced openings 11 for the passage of the molten metal from the furnace 3 into the annular space between the mandrel and mold to form cast tube 8.
  • the direction of withdrawal of the cast metal is indicated by an arrow 9.
  • the mandrel 2 is hollow forpart of its length to define a cavity 5 substantially in the shape of a bellshaped recess having an increasing cross-sectional area in the direction in which the cast tube 8 is withdrawn from the mold; so that the wall thickness of the mandrel decreases in the direction of withdrawal of the tube 8 from the mold.
  • the heat flow in the mandrel corresponds approximately to the pattern indicated by the broken lines, the solidification zone of the melt being in the region designated as A. It is clear that the reduction of cross-sectional area of mandrel 2 due to cavity 5 not only sharply reduces the surface area of the mandrel available for transferring heat from the melt, thus limiting the amount of heat lost, but also effectively restricts the heat flow substantially to the region A.
  • the mold 1 is provided with a surrounding cooling means such as jacket 4, through which flows a fluid coolant such as water.
  • a secondary cooling device 10 is connected to the cooling jacket 4. Secondary cooling is achieved by spraying coolants against the tube 8 in the zone 6.
  • the mandrel extends into the secondary cooling area 6 of the casting which provides an additional safeguard against a break-out.
  • the mold 1 and mandrel 2 are of heat-resistant material which cannot be wetted with molten metals.
  • cooling the inner wall of mandrel 2 for example, by inert gas or by a liquid cooling medium.
  • the cooling medium can pass through a channel 16 in the furnace wall, radially through the wall of the mold 1, then through the flange 7 between two adjacent openings 11, and thence into mandrel cavity 5. Bore 16 is indicated partially in broken lines.
  • the casting 8 is cooled by a flow of coolant through the cooling jacket 4 and additionally, if desired, by the open spray at 6. It can be most advantageous to vary the coolant flow in response to temperature variations occurring during the casting process.
  • temperature sensors such as thermocouples 12 can be arranged at appropriate points 15. These sensors provide amplifier 14 with an electrical signal which is proportional to the temperature at the points 15.
  • the output of amplifier l4 actuates control valve 13 to vary the flow of coolant to the jacket 4 and spray 6. It will be appreciated that the temperature sensors ultrasonic measuring can be used to control flow of coolant to mandrel cavity as well as to the external cooling means.
  • said mandrel being hollow for a portion of its length to define an internal cavity within said mandrel, said cavity within said solidification zone having an increasing cross-sectional area in the direction in which the cast tube is withdrawn from said mold and said mandrel having a wall thickness within said solidification zone about said cavity progressively decreasing in the direction in which the cast tube is withdrawn from the mold to provide a narrowing heat conductive cross-section for concentration of the heat flow into the solidification zone.
  • cooling means surrounding the mold comprises a jacket having circulating coolant supplied thereto and means connected to said jacket for spraying a portion of said circulating coolant on the cast tube as it emerges from the other end of the mold and said mandrel extends beyond the end of the mold to support the tube in the region being cooled by said spray.
  • An apparatus in accordance with claim 4 which comprises means positioned adjacent the cast tube in the mold for providing an electrical signal in response to changes in temperature of the cast tube and flow control means responsive to said electrical signal for varying the amount of coolant circulating to said jacket to counteract the temperature changes of the cast tube.
  • An apparatus in accordance with claim 1 which comprises means for conducting a cooling fluid to the hollow portion of said mandrel for cooling the mandrel.
  • cooling fluid is an inert gas
  • said mandrel includes at least one longitudinally riblike reinforcement on the inside wall of said mandrel.
  • An apparatus in accordance with claim 1 which further includes a reinforcing disc inserted in the mouth of said mandrel for reinforcing the wall of said mandrel.
  • a mandrel disposed within said mold to define a stationary annular space therebetween for a continuous casting of a metal tube therein, said mandrel having a cavity formed therein with an increasing cross-sectional area in the direction in which the metal tube is withdrawn from said mold and a wall defining said cavity said wall having a progressively decreasing thickness to the end of said wall in said direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US00061701A 1969-08-08 1970-08-06 Apparatus for continuously casting tubes Expired - Lifetime US3734166A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1226169A CH512279A (de) 1969-08-08 1969-08-08 Vorrichtung zum Stranggiessen von Rohren

Publications (1)

Publication Number Publication Date
US3734166A true US3734166A (en) 1973-05-22

Family

ID=4381367

Family Applications (1)

Application Number Title Priority Date Filing Date
US00061701A Expired - Lifetime US3734166A (en) 1969-08-08 1970-08-06 Apparatus for continuously casting tubes

Country Status (13)

Country Link
US (1) US3734166A (de)
JP (1) JPS4931410B1 (de)
AT (1) AT304787B (de)
BE (1) BE754617A (de)
CA (1) CA942925A (de)
CH (1) CH512279A (de)
DE (1) DE7029149U (de)
DK (1) DK125745B (de)
ES (1) ES382923A1 (de)
FR (1) FR2057076B1 (de)
GB (1) GB1323752A (de)
NL (1) NL168732C (de)
SE (1) SE370340B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008584A (zh) * 2012-12-26 2013-04-03 西南铝业（集团）有限责任公司 铸造铝锂合金扁锭的冷却装置及应用方法
CN103736938A (zh) * 2013-12-31 2014-04-23 安徽中鼎金亚汽车管件制造有限公司 一种钢管成型模具
CN109570460A (zh) * 2019-01-31 2019-04-05 上海海亮铜业有限公司 一种铜合金水平连铸石墨结晶器
CN113441696A (zh) * 2021-06-09 2021-09-28 佛山市三水凤铝铝业有限公司 一种双金属管的铸造设备及其铸造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2243060C1 (ru) * 2003-10-16 2004-12-27 Открытое акционерное общество "Сибирско-Уральская алюминиевая компания" Устройство для полунепрерывного литья дугообразных армированных заготовок
CN104325098B (zh) * 2014-10-23 2017-07-04 陕西华安铸铁型材有限公司 一种铸铁水平连续铸造双水套式结晶器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008584A (zh) * 2012-12-26 2013-04-03 西南铝业（集团）有限责任公司 铸造铝锂合金扁锭的冷却装置及应用方法
CN103008584B (zh) * 2012-12-26 2015-12-23 西南铝业（集团）有限责任公司 铸造铝锂合金扁锭的冷却装置及应用方法
CN103736938A (zh) * 2013-12-31 2014-04-23 安徽中鼎金亚汽车管件制造有限公司 一种钢管成型模具
CN103736938B (zh) * 2013-12-31 2016-08-24 安徽中鼎金亚汽车管件制造有限公司 一种钢管成型模具
CN109570460A (zh) * 2019-01-31 2019-04-05 上海海亮铜业有限公司 一种铜合金水平连铸石墨结晶器
CN113441696A (zh) * 2021-06-09 2021-09-28 佛山市三水凤铝铝业有限公司 一种双金属管的铸造设备及其铸造方法

Also Published As

Publication number Publication date
NL168732B (nl) 1981-12-16
BE754617A (fr) 1971-02-10
CA942925A (en) 1974-03-05
CH512279A (de) 1971-09-15
FR2057076B1 (de) 1974-09-20
FR2057076A1 (de) 1971-05-07
DE7029149U (de) 1970-11-26
JPS4931410B1 (de) 1974-08-21
NL168732C (nl) 1982-05-17
SE370340B (de) 1974-10-14
DK125745B (da) 1973-04-30
NL7011614A (de) 1971-02-10
ES382923A1 (es) 1972-12-16
GB1323752A (en) 1973-07-18
AT304787B (de) 1973-01-25
DE2038474A1 (de) 1971-02-11

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