Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/50—Pouring-nozzles

Definitions

• the invention relates to a method and a device for influencing the flow propagation of a metallic liquid, in particular steel, from a melt container via a first immersion pouring part, which has a polygonal, oval or circular cross section, and an intermediate part through a second immersion pouring part, which has an elongated cross section comprises, flows into a stationary mold for producing slabs.
• a pouring tube for metallurgical vessels which is divided into an upper tubular length section and a lower rectangular length section part, a conical transition being provided between the two length sections.
• the rectangular cross section can have an aspect ratio of 20: 1 to 80: 1.
• a crossbar is provided, which guides the liquid steel into the side mouth openings.
• the steel enters the mold with relatively high kinetic energy.
• the crossbar is subject to high wear.
• Has shape which is connected via a conical component with a lower rectangular mold immersed in the melt. Longitudinal webs are provided in the flow cross section in the lower molded block.
• a transverse web is provided which deflects the melt flow in the direction of the expansion of the flow shaft.
• This cross bar designed as a baffle plate will disadvantageously lead to strong turbulence in the melt.
• the invention has set itself the goal of avoiding the disadvantages mentioned above and using simple means to create a method and a device relating to an immersion nozzle for guiding metal melts, with which the turbulence in the immersion nozzle itself and in the mold and at the same time the penetration depth of the supplied melt is minimized in the swamp in the mold.
• the invention achieves this goal by the characterizing features of method claim 1 and device claim 5.
• the central volume flow in the inlet region of this immersion pouring part is reduced in the case of an immersion spout, the mouth part of which immerses in the melt located in the mold has an elongated cross section.
• This reduction in the volume flow is caused by throttling the central area, the spreading angle of the
• the liquid jet is enlarged to such an extent that backflow into the side region of the immersion pouring part, which has an elongated cross section, is substantially prevented.
• the melt flows out of this immersion pouring part with a speed profile, the speed vectors of which in the mouth center are smaller than in the areas of the narrow sides.
• the quantity supplied by the diving spout coincides with the set one
• the speed profile in the area of the narrow sides at the mouth of the immersion pouring part having an elongated cross section has speed vectors which have components which have a backflow on the narrow sides of the mold allow.
• a sufficient amount of fresh melt is fed to the bath level in the mold with a positive influence on the casting powder applied to the surface.
• this melt flows to the center between the immersion nozzle and the mold with only a small bow wave but sufficient quantity.
• the melt streams combine in the middle of the mold and then flow into the sump in the direction of strand withdrawal. There they fill up the volume flow emerging from the second immersion pouring part in the muzzle center.
• the throttling of the central volume flow is achieved in that the area before entering the immersion pouring part, which has an elongated cross section, or the entrance itself is designed in a special way. In any case, the free space is kept sufficiently open so that a defined amount always flows in the central area of the second immersion pouring part.
• the wall of the broad side of the intermediate part arranged in the casting direction in front of the immersion pouring part which has an elongate cross section can have a concave bulge.
• this bulge is designed in the form of a quarter hollow sphere. In a further embodiment, it has the shape of a tube segment with a predeterminable contour.
• the throttling is also achieved by narrowing the space for the entry of the immersion pouring part. This narrowing can be brought about by flow bodies which are arranged on the broad side of the immersion pouring part or by molding in dents.
• the narrowing has a dimension whose width corresponds approximately to the diameter of the upstream tubular immersion pouring part and in the length from 0.2 to 1.2 times its width.
• the leading and trailing edges are sharp-edged and have an angle ⁇ from the leading edge and the inner wall of 90 to 150 °.
• the shape of the intermediate part and the narrowing can be combined. With this combination it is proposed to match the contour of the bulge of the intermediate part with the leading edge of the flow element in the second immersion pouring part.
• Figure 1-3 a diving spout with bulge Figure 4-5 a diving spout with constriction
• FIGS. 2, 3 and 5 show cross sections of an immersion nozzle which is composed of a first immersion nozzle 11, an intermediate part 31 and a second immersion nozzle 21.
• the center axis is labeled I.
• the first immersion pouring part 11 When using the same position numbers in all figures, the first immersion pouring part 11 is fastened to a melt vessel 41 via a flange 12.
• the outlet 42 of the melt vessel 41 can be closed by a plug 43.
• the first immersion pouring part 11 has a round, oval or polygonal cross section and is connected via the intermediate part 31 to the second immersion pouring part 21, which has broad sides 25 which are significantly larger than narrow sides 26.
• the first immersion pouring part 11 has a slot 13 on.
• the second immersion pouring part 21 projects into a mold 51, the mouth 28 being immersed in the melt S located in the mold 51.
• Casting powder P is on the melt S.
• the intermediate part 31 has a bulge 34, which is designed in the right part as a spherical shape 35 and in the left part as a tubular segment 36.
• the bulge 34 in the form of a tubular segment 36 directly adjoins the round immersion pouring part 11.
• the tube segment 36 can have a constant radius with respect to its main axis II or can also be designed in a parabolic manner.
• FIG. 2 shows the top view of the bulge 34, here as a tube segment 36.
• FIG. 3 shows the top view of the bulge 34 as a spherical shape 35.
• the first immersion pouring part 11 opens, shown here as a tube, the slot 13 being located at the mouth.
• the intermediate part 31, which covers the broad sides 32 is shown on both sides of the narrow side 33.
• the narrow side 33 is inclined at an angle ⁇ to the run-up 22.
• FIG. 2 shows the view on the broad side 32 of the intermediate part 31.
• the bulge 34 is designed as a tubular segment 36.
• the bulge 34 is designed as a quarter hollow ball 35.
• FIGS. 2 and 3 represent the speed vectors.
• FIG. 2 shows how the melt volume and quantity behind the throttle element are reduced in the central region in the direction of flow. The melt flows clearly into the second immersion pouring part 21 at a spread angle ⁇ .
• the speed profile in the area of the narrow side walls has a shape which has a lower speed in the mouth center.
• the speed vectors have a component that allows part of the melt to flow back to the bath surface. Here they are guided to the center of the mold 51 and in the center of the mold 51 between the immersion spout 21 and the broad side 25, and the broad side 52 of the mold 51 are again directed in the strand withdrawal direction.
• the narrow side 21 opens conically at an angle ⁇ at the mouth of the second immersion pouring part with respect to the central axis I.
• This angle ⁇ can be significantly above the 7 ⁇ possible with free rays and can have a value of up to 15 ° (FIG. 5).
• FIG. 4 has a flow body 62 or a bulge 61 in the shade 22 of the first immersion pouring part 11 in the inlet 22.
• the first immersion pouring part 11 is designed as a tube, the end of which is closed by a closure 27.
• a tubular segment 36 is arranged in the inner gusset between the closure 27 and the tube 11.
• the contour 37 is parabolic. From its mouth, the pipe segment meets the leading edge of a flow body 62.
• leading edge 64 is arranged at an angle of 90 ° to the inside of the flow body 62.
• the trailing edge 65 of this flow body 62 also has an angle ⁇ of 90 °.
• the tube 11 is closed by an inclined surface 38 which leads to the inlet 22 of the second immersion pouring part 21.
• the inlet area 22 is designed as a bulge 61.
• the outer surface of the leading edge 64 has the same angle of inclination as the inclined surface 38.
• the trailing edge 65 has an angle ⁇ of approximately 45 °.
• the broad side 25 of the second immersion pouring part 21 has the same wall thickness as the bulge and jumps outwards in the region of the trailing edge 65.
• the free space 23 has the same size as the entire second immersion pouring part up to its mouth.
• FIG. 5 shows the top view of the section of the second immersion pouring part 21 shown in FIG. 4 with the constriction 61, 62.
• the angle ⁇ in the upper region of the possible bevel ⁇ 0 to 40 ".
• the angle ⁇ has also been selected to be larger than in FIGS. 2 and 3, with ⁇ can be between 0 and 15 °.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Coating With Molten Metal (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Jet Pumps And Other Pumps (AREA)
• Devices For Dispensing Beverages (AREA)
• Details Of Rigid Or Semi-Rigid Containers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7796971

Family Applications (1)

Country Status (14)

Families Citing this family (5)

Family Cites Families (5)

• 1996
  • 1996-06-04 DE DE19623787A patent/DE19623787C2/de not_active Expired - Fee Related
• 1997
  • 1997-05-22 ZA ZA9704485A patent/ZA974485B/xx unknown
  • 1997-05-29 DE DE59701153T patent/DE59701153D1/de not_active Expired - Lifetime
  • 1997-05-29 KR KR1019980709857A patent/KR100355001B1/ko not_active Expired - Fee Related
  • 1997-05-29 BR BR9709536A patent/BR9709536A/pt not_active IP Right Cessation
  • 1997-05-29 WO PCT/DE1997/001093 patent/WO1997046344A1/fr not_active Ceased
  • 1997-05-29 US US09/194,987 patent/US6260740B1/en not_active Expired - Lifetime
  • 1997-05-29 AU AU31641/97A patent/AU3164197A/en not_active Abandoned
  • 1997-05-29 CN CN97195276A patent/CN1087200C/zh not_active Expired - Fee Related
  • 1997-05-29 EP EP97926968A patent/EP0902736B1/fr not_active Expired - Lifetime
  • 1997-05-29 AT AT97926968T patent/ATE189868T1/de active
  • 1997-05-29 ES ES97926968T patent/ES2142686T3/es not_active Expired - Lifetime
  • 1997-05-29 CA CA002257139A patent/CA2257139C/fr not_active Expired - Fee Related
  • 1997-05-29 RU RU99100098/02A patent/RU2153956C1/ru not_active IP Right Cessation
  • 1997-05-29 JP JP50009498A patent/JP3174348B2/ja not_active Expired - Fee Related

Non-Patent Citations (1)

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