Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D18/00—Pressure casting; Vacuum casting
  • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

• the invention relates to a method and a device for increasing casting, in particular for casting light metal alloys.
• rising pouring has the main advantage of a calm, controlled pouring process. This avoids the air bubble entry and the oxide skin entry, which is associated with each swirling of the melt during casting.
• core packages are used as casting molds, the detachment and entrainment of molding material in the gate and in the casting run can be avoided, which otherwise leads to a reduction in the quality of the castings.
• the invention has for its object to improve a method and an apparatus of the type mentioned to increase reliability.
• the solution to this is based on a first " approach in a process for increasing casting / low pressure casting - in particular of light metal alloys - with a casting table with a passage opening, with a casting furnace lying under the casting table with a riser pipe which forms a mouth opening open at the top, with a casting mold with a base plate that has a pouring opening that is open at the bottom; the mouth opening is sealingly attached to the through opening from below, the casting mold is brought with its pouring opening over the through opening, melt is conveyed from the pouring furnace through the riser tube until it is filled into the casting mold, the mold is moved horizontally on the casting furnace with the melt-filled connection between the casting furnace and the casting mold open until the pouring opening at the bottom of the casting table and the passage opening at the top are closed by the base plate, the melt is in the riser pipe up to the mouth opening ng dropped back.
• a method for increasing casting / low-pressure casting - in particular of light metal alloys - is proposed with a casting table with a passage opening, with a casting furnace lying under the casting table with a riser pipe which forms a mouth opening open at the top, with a casting mold with a base plate, which has a pouring opening which is open at the bottom, the mouth opening is sealingly attached to the passage opening from below, the casting mold with its pouring opening is brought over the passage opening, melt is conveyed from the casting furnace to the casting mold until it is filled, the casting mold is left in this position until the casting has solidified, the melt will fall back in the riser pipe to below the mouth opening The casting mold is moved horizontally on the casting table with the passage opening melt-emptied until the pouring opening is closed at the bottom by the casting table and the mouth opening at the top by the base plate.
• a device suitable for carrying out these processes comprises a casting table with a passage opening, a casting furnace under the casting table with a riser pipe which forms a mouth opening which is open at the top, a casting mold with a base plate which has a casting opening which is open at the bottom; the mouth opening is sealingly attached to the passage opening from below, the casting mold is attached to the passage opening from above, means for horizontally displacing the casting mold on the casting table and means for simultaneously maintaining a positive pre-pressure of the base plate of the casting mold with respect to the casting table.
• the top of the casting table which can be reinforced with an inserted ceramic plate or rail, and the underside of the base plate of the casting mold, which lie flat on one another, act as a closure means.
• the solidification of the cast part is first waited until there is only liquid melt in the sprue, which is then dropped back into the riser pipe by lowering the pressure before the emptied sprue opposite the opening of the casting table or the mouth of the riser on the casting table is moved so that the next mold can be adjusted.
• the surfaces mentioned can be pressed against one another with contact pressure.
• This is possible by means of horizontal rails or roller sets which are elastically attached to the casting table and which act to press the casting mold onto the casting table when moving on fixed horizontal edges or rails of the casting mold, or by means of horizontal rails or roller sets which are arranged elastically on the casting mold and which are used to press the casting mold on Interacting the casting table with horizontal edges or rails fixed to the casting table. Suitable material combinations for these surfaces are to be selected depending on the type of casting metal.
• the feeding of the casting molds into the casting position can take place in different ways, either the casting mold being placed on the casting table from above in such a way that the passage opening or the mouth opening is openly connected to the pouring opening, or alternatively the casting mold is in each case horizontally so over the Casting table is fed that the passage opening or the mouth opening is openly connected to the gate opening.
• the mold can be stopped in a position in which the casting table is cooled under the sprue opening.
• the casting mold with the sprue opening can be moved over a cooled distance of the casting table when moving.
• this initially relates to methods and devices in which a controllable gas pressure is applied to the melt level in the sealed casting furnace, which causes the melt in the riser pipe to rise or fall back.
• a controllable gas pressure is applied to the melt level in the sealed casting furnace, which causes the melt in the riser pipe to rise or fall back.
• other methods and devices are also included that can regulatably promote the melt in the riser pipe, e.g. Magnetic pump arrangements at the lower end of the riser pipe in the casting furnace.
• FIG. 1 Structure of a form in the casting furnace; Form 1 in casting position; Form 2 is open;
• Figure 2 casting the mold 1; Form 2 is closed;
• Figure 3 form 2 in the casting position; Form 1 in the freezing position;
• Figure 6 Form 1 in the casting position; Form 2 in the freezing position;
• Figure 7 casting the mold 1; Form 2 is open;
• Figure 8 casting the mold 1; Demolding of form 2;
• FIG. 9 shows a casting installation according to the invention with several individual molds a) in plan view b) in side view;
• Figure 10 shows a casting plant according to the invention with a
• a horizontal casting table 11 has a passage opening 12 which is covered with an outer lining 13 and an inner lining 14.
• An arrow 25 indicates that compressed air can be applied to the casting furnace 21, so that a melt column 26 rises in the riser.
• This base plate 30 has sprue openings 31, 32, which can be brought to coincide with the passage opening 12 by transverse displacement of the base plate 30.
• the gate openings 31, 32 are each provided with linings 33, 34.
• the casting molds 1, 2 constructed on the base plate 30 each have holders 35, 36, 37, 38 with actuating cylinders 39, 40, 41, 42 which act on mold halves 43, 44, 45, 46.
• a central mandrel 47, 48 the suspension of which is not shown in detail, is located in the middle between the mold halves. Together with the closed mold halves, this forms a hollow cylinder with a slightly conical inner shape and external ribbing.
• the casting to be produced with the molds 1, 2 shown can in particular be a cylinder liner made of light metal for internal combustion engines. -Volume and shape changes of the casting when solidifying are neglected in all representations.
• the riser pipe 22 seals against the casting table 11 at the bottom in the area of the passage opening 12.
• the casting furnace 21 can be moved in height from below against the casting table 11.
• the respective pouring opening 31, 32 in the base plate 30 lies in a sealing manner at the upper exit of the through opening 12. Lowering the casting furnace is particularly advantageous in order to replace an empty casting furnace with a filled casting furnace.
• a pre-pressure is built up in the casting furnace, which allows the melt column 26 to rise slightly above the mouth opening 24.
• the casting mold 1 is assigned to the casting furnace 21 by moving the base plate 30 to the right into a first casting position.
• the casting mold 1 is closed, as indicated by arrows, and ready for casting.
• the mold 2 is open, as indicated by arrows and removed from the mold.
• the base plate 30 is shifted to the left into a second casting position, the melt column in the casting mold 1 having been sheared off between the casting table 11 and the base plate 30 and a finished casting being produced in the casting mold 1.
• the casting mold 2 is assigned to the casting furnace 21 by moving the base plate 30 to the left into a second casting position and is ready for the casting process in the closed position.
• the melt column 26 is initially allowed to fall back in the riser pipe 22 to slightly above the mouth opening 24.
• the casting mold 1 is opened as indicated by arrows, the finished casting still being held on the central mandrel 47.
• the melt column rose by increasing the pressure in the casting furnace, so that the casting mold is completely filled.
• the actual casting process has already been completed here. 5
• the mold 1 is closed again, the finished casting 49 being completely removed from the mold.
• the mold 2 is shown as in Figure 4 during the melting process.
• the base plate 30 is again shifted to the right into the first casting position, so that the casting mold 1 is again assigned to the casting furnace 21.
• the melting column in casting mold 2 has been sheared off, so that a finished casting can be seen in the casting mold.
• the mold 2 is still closed to wait for the solidification process.
• the casting mold 1 is prepared for the next casting process, the melt column 26 ending slightly above the mouth opening 24 in the riser pipe 22.
• the casting mold 2 is open, as indicated by arrows, a finished casting still resting on the central pin 48.
• the melt column 26 has risen by increasing the admission pressure in the casting furnace 21 and thus the column has been filled, so that the actual casting process has already ended here.
• FIG. 9 shows a casting table 51 with a passage opening 52 and with cooling positions 53, 54 indicated by arrows.
• a casting furnace 61 Under the casting table is a casting furnace 61 with a riser pipe 62 which is filled with melt.
• the mouth opening 64 of the riser pipe 62 connects to the passage opening 52 from below.
• Three individual molds 71, 72, 73 are placed on the casting table 51.
• the mold 71 lies with the sprue 74 over the casting furnace 61 and is in the process of being poured.
• the shape 72 is already behind the opening 52 shifted to the left, whereby the melt column has been sheared off and is in a position in which the sprue 75, 76 in the mold 72, 73 lies above a cooling region 53 of the casting table.
• the mold 73 is displaced further and is in a position in which the sprue 75, 76 in the mold 72, 73 lies over a cooling region 53, 54 of the casting table, with solidification taking place in the sprue 76. From here, the mold can be moved further or lifted off the casting table. Arrows 77, 78 indicate the effect of a form which prevents melt from escaping when the casting mold is filled. The effect of a higher active pressure for feeding is indicated by an arrow 79.
• a device according to the invention is shown in top view in FIG. 10, a casting table 91 being designed only as narrow paths.
• the casting table here has two casting stations 92, 93 with passage openings 94, 95 and two solidification stations 96, 97.
• Casting molds 101, 102 can each be placed on the casting stations for casting from above, whereby they can be moved after casting and then the positions of the here assume molds 103, 104 designated during solidification.
• Pouring furnaces ND1, ND2, ND3, ND4 can be brought into the vicinity of a melting furnace 111 and from there can be moved into a stopping position in front of the casting stations 92, 93, into a casting position and into a stopping position behind the casting stations 92, 93, so that empty ones in each case
• Pouring furnaces can be refilled at the melting furnace 111 and, after emptying a pouring furnace, a filled pouring furnace can be refilled from a waiting position into the pouring position under the pouring table.
• Casting stations 92, 93 of the casting table should always be ready for casting, so that there is no interruption in production during the changing of a casting furnace.
• the two casting stations can normally also be operated in parallel in order to increase the production rate.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Casting Devices For Molds (AREA)
• Auxiliary Devices For And Details Of Packaging Control (AREA)
• Confectionery (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Manufacture And Refinement Of Metals (AREA)

Priority Applications (11)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7648520

Family Applications (1)

Country Status (13)

Citations (4)

Family Cites Families (7)

• 2000
  • 2000-07-11 DE DE10033625A patent/DE10033625A1/de not_active Withdrawn
• 2001
  • 2001-07-10 AT AT01957943T patent/ATE260727T1/de not_active IP Right Cessation
  • 2001-07-10 DE DE50101632T patent/DE50101632D1/de not_active Expired - Lifetime
  • 2001-07-10 AU AU7973001A patent/AU7973001A/xx active Pending
  • 2001-07-10 ES ES01957943T patent/ES2217174T3/es not_active Expired - Lifetime
  • 2001-07-10 MX MXPA03000288A patent/MXPA03000288A/es active IP Right Grant
  • 2001-07-10 WO PCT/EP2001/007915 patent/WO2002004149A1/de active IP Right Grant
  • 2001-07-10 BR BR0112408-0A patent/BR0112408A/pt not_active Application Discontinuation
  • 2001-07-10 US US10/312,800 patent/US20030178169A1/en not_active Abandoned
  • 2001-07-10 HU HU0301499A patent/HUP0301499A2/hu unknown
  • 2001-07-10 EP EP01957943A patent/EP1299202B1/de not_active Expired - Lifetime
  • 2001-07-10 CA CA002412935A patent/CA2412935A1/en not_active Abandoned
  • 2001-07-10 AU AU2001279730A patent/AU2001279730B2/en not_active Ceased
  • 2001-07-10 PL PL359786A patent/PL198944B1/pl not_active IP Right Cessation
  • 2001-07-10 SK SK22-2003A patent/SK286623B6/sk not_active IP Right Cessation

Patent Citations (4)

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