Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C9/00—Moulds or cores; Moulding processes
  • B22C9/10—Cores; Manufacture or installation of cores
  • B22C9/103—Multipart cores

Definitions

• the invention relates to a method for introducing cores into a casting mold.
• the invention is based on the object of creating a method which simplifies the introduction of the Causes cores in such a mold and avoids costly post-processing.
• This object is achieved according to the invention in that the individual cores are introduced into a setting jig, that the adjoining cores forming a core group in the setting jig are connected to one another via tensioning and holding means, that the interconnected core group is combined in one Sizing bath is dipped and dried and that the dried core group is inserted into the casting mold and then the bracing is released.
• This method takes advantage of the fact that at least some cores forming a core group are each provided with core brands which can be designed such that on the one hand they touch one another and on the other hand also protrude beyond the actual shaping core surface and form corresponding contact surfaces , so that here the cores can be clamped against each other and fixed against each other by means of a corresponding, for example frame-shaped, clamping means and can thus be handled as a unit. It is expedient if the contacting contact surfaces of the cores are provided with so-called green glue before insertion into the setting gauge in order to improve the cohesion even further.
• this core group is immersed in a size bath in accordance with the method according to the invention and the size is dried after dripping, the relatively thin gaps in the area of the contact surfaces of adjoining individual cores, which cannot be avoided, are filled in by the size, so that this results in the formation of burrs is avoided.
• the core group is then transported further with the aid of the clamping and holding means and inserted into the prepared casting mold, for example a lower box, so that after the tensioning has been released, the upper box is put on and the casting process can be carried out in the usual way.
• the method according to the invention makes it possible, depending on the design of the casting to be produced, to connect a single core group composed of a plurality of individual cores or also one of a plurality of core groups forming a core assembly for a casting mold as a core set via the clamping and holding means and in the individual treatment steps until it is inserted into the mold.
• This enables the handling of very complex core groups in this way.
• the previously required additional inlay work which always led to the formation of burrs in the transition region between the individual core and the associated basic core, is avoided in this way, since the approach between the core approach and the associated basic core avoids burr formation by covering the entire
• the individual cores 1, 2, 3 and 4 are then placed in a setting gauge 5 in method step I, by means of which the mutual assignment of the cores 1, 2, 3 and 4 is fixed.
• the cores 1, 2, 3 and 4 are on their outside facing side in the usual way provided with core marks 6, which are now designed so that they have an outwardly facing contact surface, which in turn is expediently designed such that adjacent contact surfaces 7 are aligned with each other.
• the individual cores 1, 2, 3 and 4 forming a core group and inserted into the setting gauge 5 are now firmly clamped together with a clamping and holding means 8, for example, in the form of a frame, the mutually directed projections 9 on the individual cores 1, 2, 3 and 4, which, depending on the design of the casting to be produced, either serve to produce openings in corresponding wall parts of the casting or, on the other hand, are designed as core marks and are firmly pressed together.
• the cores can be provided with a so-called green adhesive on their mutually facing contact surfaces 9.1, so that in this area the fixation is further increased by adhesive bonding.
• the core group combined to form a unit 10 can now be transported in a method step III via the manipulator 8.1, which detects the clamping and holding means 8 on the gripping cam 8.2, and immersed in a sizing bath 11.
• the tensioning and holding means 8 can also be turned by the manipulator 8.1, so that excess size can drip off after immersion. Since the, for example, frame-shaped clamping and holding means 8 holds the cores 1, 2, 3 and 4 combined as a core group only in the area of the core brands later during casting, the surfaces of the core group forming the corresponding areas of the casting are completely covered with size, the gaps between the individual adjacent cores 1, 2, 3 and 4 being closed by the size and thus avoiding the formation of casting burrs.
• the unit 10 In the subsequent process step IV, the unit 10 must be fed to a drying device 16 in which the size coating is dried, for example by a combined microwave and air drying process.
• the manipulator 8.1 deposits it in a movable oven support 12.
• the furnace support 12 has clamping cheeks 13 on two opposite sides, which are inclined toward one another with their inwardly facing clamping surfaces 14 opening upwards.
• clamping cams 15 Arranged on both sides of the gripping cam 8.2 on the clamping and holding means 8 are clamping cams 15 each projecting therefrom, which are provided with a counter surface corresponding to the clamping surface 14, so that when the unit 10 is placed in the furnace support
• the manipulator 8.1 can then be released and the entire arrangement can be moved into the drying device 16.
• the core group combined in the unit 10 is lifted out of the oven support 12 by the manipulator 8.1 and is now inserted in the next process step V into the lower case 17 or a set-up gauge for a prepared casting mold. Only now is the frame-shaped clamping and holding means 8 released and removed from the core group. Subsequently, in the following process step VI, the upper box 18 is placed on the lower box 17 and firmly connected to it, so that the casting process can then take place. From the above description of the process sequence for a schematic exemplary embodiment with a core group composed of four individual cores, it is evident that even very complex castings can be produced using the method according to the invention.
• Another advantage of the method according to the invention is that the cycle times when casting the finished molds can be increased, since the time required for inserting cores is considerably reduced. Another advantage of the method according to the invention is that there is greater flexibility with regard to customer requirements or further developments. Here it is only necessary to ensure when designing the cores that neighboring cores, even if these have no approaches between them for the formation of breakthroughs and which must then have core brands anyway, are designed in such a way that necessary core marks touch each other directly, so that a bracing is possible with a corresponding design of the core marks on the outside via a preferably frame-shaped clamping and holding means.
• the method according to the invention also allows two or more core groups belonging to one another to be combined into a complete core set in a common clamping and holding means, without the individual core groups themselves having to be brought into contact by means of a corresponding arrangement of approaches.
• the method according to the invention is therefore also possible if individual core groups do not have a common clamping plane with regard to their core brands. It is then possible here to clamp the individual core groups together in a main frame with special clamping and holding means and to handle them for the subsequent process steps until they are inserted into the casting mold.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Casting Devices For Molds (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7775929

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Family Cites Families (7)

• 1995
  • 1995-10-27 DE DE19540023A patent/DE19540023A1/de not_active Withdrawn
• 1996
  • 1996-07-04 WO PCT/EP1996/002943 patent/WO1997016271A1/fr not_active Ceased
  • 1996-07-04 EP EP96924883A patent/EP0802839B1/fr not_active Expired - Lifetime
  • 1996-07-04 AT AT96924883T patent/ATE173965T1/de not_active IP Right Cessation
  • 1996-07-04 ES ES96924883T patent/ES2127647T3/es not_active Expired - Lifetime
  • 1996-07-04 JP JP52976696A patent/JP3894569B2/ja not_active Expired - Fee Related
  • 1996-07-04 CN CN96191295A patent/CN1131746C/zh not_active Expired - Fee Related
  • 1996-07-04 US US08/836,149 patent/US6003588A/en not_active Expired - Fee Related
  • 1996-07-04 DK DK96924883T patent/DK0802839T3/da active
  • 1996-07-04 DE DE59600907T patent/DE59600907D1/de not_active Expired - Fee Related

Non-Patent Citations (1)

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