Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D25/00—Special casting characterised by the nature of the product
  • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
  • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D7/00—Casting ingots, e.g. from ferrous metals

Definitions

• the invention relates to a method and an apparatus for casting metal bars or the like. in the bag casting using one from one at its lower end
• Such methods and devices can be used for the spectrometric analysis of metals or
• Calibration of spectrometers may have high requirements with regard to homogeneity, fineness
• Samples for examining a particular melt are usually in the form of flat disks or cylinders Cast steel molds, just big enough to fit the
• the process is a gravity die casting process in which thin-walled steel cylinders closed at the bottom,
• Solidification of the cast metal can be lowered into a water bath.
• Suitable continuous casting process is generally forbidden because of the insufficient casting volume, for which the apparatus and the associated with the continuous casting process
• the invention is therefore based on the object
• the shape and surface quality of these rods should be such that little or no machining of their outer surface is required, since the most favorable microstructures are present in the rapidly solidified outer zone of the rods. Besides, that should
• This object is achieved according to the invention in a method of the type mentioned in that a filling tube which is open or open at its lower end and closable at its upper end is used for filling the mold tube with casting metal, the lower end of which is inserted into a molten metal of the casting metal is immersed, the casting metal being brought to flow into the filling tube, that the filled filling tube is then closed at its upper end and lifted out of the molten metal with its filling and then with its lower end into the mold tube from above is introduced, followed by opening the top
• Liquid bath is allowed to sink. Doing so
• the mold can be filled with largely reduced foaming or interlacing with oxide, which was not possible with the cumbersome filling using the previously known scooping process.
• the mold tube is expediently lowered in the liquid bath at a speed which is approximately the same
• Chill tube in the liquid bath also achieves an immediate onset and progressive quenching of the poured pouring metal, whereby a very fine crystalline and segregation-free
• Microstructure formation in the finally solidified cast body is obtained.
• One is from the German patent specification 750 673
• Lifting filling pipe of the aforementioned type according to the invention while the lowering of the casting table is carried out with the aid of a hydraulic or similarly designed lowering device.
• the mold used for the casting of metal blocks is built up only with its progressive filling and the simultaneous lowering of the casting table in the water bath in its height, as a result of which the trough leading from the side to the mold at its exit end is at the lowest possible height can be held above the level of the cast metal poured into the mold.
• this method of filling is in a method for casting
• the invention also relates to a
• Bag casting device for carrying out the method according to the invention, which has a mold tube which can be lowered into a liquid bath and is closed at the bottom by a bottom.
• This device is designed in such a way that the mold tube is mounted in a float body and is guided up and down with it in and above the container holding the liquid bath, which float body is designed so that it can mold the mold tube before it is filled with casting metal with its lower end at about the level of the liquid bath or above, and in suspension brings it to a lowering into the liquid bath when filling, and that a filling pipe serving to pour casting metal into the mold pipe can be inserted, which has an opening for leakage of the cast metal in the mold tube.
• the float body is advantageously designed and dimensioned such that it brings the mold tube to a lowering rate in the liquid bath when it is filled, which is in a desired ratio to the rate of increase of the
• Casting metal is in the mold tube.
• the floating body can also be designed such that the sinking speed of the mold tube either decreases or increases with its increasing filling.
• this mold tube can be opened in two parts or can be conically widened in one part
• the float body can be made of a lightweight material, such as
• thin-walled hollow body made of sheet metal or the like. consist. It can completely or only partially enclose the mold tube and on a vertical guide in which the
• Liquid bath receiving container and be guided up and down.
• This guide must be designed so that it guides the mold tube when lowering in a vertical position, which in a simple manner with tension cables
• the mold tube can also be balanced in terms of its own weight via deflection rollers by counterweights, so that the float body is correspondingly smaller and only to compensate for when filling the
• the filling tube is advantageously arranged or fixable in a holder that is independent of the height of the mold tube in a height position that is independent of the mold tube.
• the device according to the invention is based on
• Embodiment especially tailored to the relatively small amounts of metal of about 10 to 15 kg that are usually to be processed in the manufacture of the rod-shaped specimen described.
• the method according to the invention and the device according to the invention are not only applicable for the casting of such specimens, but also for the production of any other elongated castings.
• an advantageous application conceivable for casting profile rods from molten metals that react strongly with the air, such as Alloys based on titanium or magnesium or also
• the method and the device according to the invention allow e.g. the removal of the casting material below a closed, protective salt blanket and the casting under protective gas or also under a covering salt melt without any major additional
• Fig. 1 shows the warming container and in one
• Fig. 2 shows the same representation in the
• Liquid bath immersing mold tube during its filling through the filling tube
• Fig. 3 shows a broken up on a larger scale
• the mold is formed by a thin-walled tube 1, which is closed by a bottom 2 at its lower end.
• This mold tube 1 is mounted in a float body 3 which surrounds the mold tube at a distance and so
• the mold tube in the water bath 5 sinks.
• the float body 3 is guided via eyelets 6 on tension cables 7, which have their lower end at the bottom 8 of the
• Container 4 and with its upper end on a two Supports 10 connecting crossbar 9 and are held taut between these fastenings in the vertical direction.
• the mold tube can be made from the section of a
• a filling tube 11 is used, which consists of one opposite
• suitable material e.g. can consist of a metal tube suitably protected by coatings.
• the outer diameter of the filling tube 11 is somewhat smaller than the inner diameter of the mold tube 1.
• the lower end of the filling tube 11 is closed with a bottom which is provided with an outlet opening 12 through which the casting metal located in the filling tube is introduced into the mold tube 1.
• Filling tube 11 is provided with a tightly closing lid, in which a valve 13 is provided for opening and closing the upper end of the filling tube with respect to the atmosphere.
• the valve 13 is held in the closed position by a compression spring 14 and can be pulled in against the force of the compression spring 14 by means of a pull handle 15
• the fill tube At its top end is the fill tube with a
• Bearing bar 16 provided, with which it can be hung in the position inserted into the mold tube 1 in a holder 17 at the upper end of the support rods 10. In this position, the filling tube 11 located in the mold tube 1 is fixed independently of the height of the mold tube.
• the rate of descent should be approximately equal to the rate of rise of the cast metal in the mold tube 1. It is thereby achieved that the outlet opening 12 of the filling tube 11 always remains in direct contact or in the immediate vicinity of the surface of the pouring metal flowing into the mold tube during the entire inflow of the casting metal into the mold tube 1. The metal running out of the filling tube 11 reaches the mold tube with little or no free fall and thus with the least possible swirling. On the other hand, it is avoided that the filling tube is immersed in the casting metal that has flowed into the mold tube, which would result in the risk of freezing in the solidifying casting metal. Due to the increase in the level of the
• Structure formation in the solidified cast body enables.
• the cover valve 13 of the filling pipe can be a simple open-close valve, but can also be combined with a fine control valve which provides an exact metering of those emerging from the outlet opening 12 of the filling pipe 11

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=6388353

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (1)

Citations (5)

Family Cites Families (1)

• 1989
  • 1989-08-31 DE DE19893928956 patent/DE3928956C1/de not_active Expired - Fee Related
• 1990
  • 1990-08-30 CA CA 2065351 patent/CA2065351A1/en not_active Abandoned
  • 1990-08-30 WO PCT/EP1990/001450 patent/WO1991003338A1/de active Application Filing
  • 1990-08-31 FR FR9010880A patent/FR2651160A1/fr not_active Withdrawn
• 1992
  • 1992-02-21 GB GB9203812A patent/GB2252063A/en not_active Withdrawn

Patent Citations (5)

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