EP0126258A2 - Châssis pour le moulage à dépression - Google Patents

Châssis pour le moulage à dépression Download PDF

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Publication number
EP0126258A2
EP0126258A2 EP84103898A EP84103898A EP0126258A2 EP 0126258 A2 EP0126258 A2 EP 0126258A2 EP 84103898 A EP84103898 A EP 84103898A EP 84103898 A EP84103898 A EP 84103898A EP 0126258 A2 EP0126258 A2 EP 0126258A2
Authority
EP
European Patent Office
Prior art keywords
suction
vacuum
molding box
molding
vacuum lines
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84103898A
Other languages
German (de)
English (en)
Other versions
EP0126258B1 (fr
EP0126258A3 (en
Inventor
Horst Hollenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Priority to AT84103898T priority Critical patent/ATE45112T1/de
Publication of EP0126258A2 publication Critical patent/EP0126258A2/fr
Publication of EP0126258A3 publication Critical patent/EP0126258A3/de
Application granted granted Critical
Publication of EP0126258B1 publication Critical patent/EP0126258B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Definitions

  • the invention relates to a molding box for the vacuum molding process with at least one suction pipe running through the molding box and vacuum lines integrated in the molding box and its stiffening construction, the suction pipe and the vacuum lines to the inside of the molding box having suction surfaces.
  • the casting mold is solidified by sucking off the air contained in the molding sand.
  • the surface of the casting mold is covered with a film and thus sealed airtight.
  • suction pipes are arranged inside the mold box, which are embedded in the molding sand in the finished casting mold.
  • These suction pipes and the molding box itself have suction surfaces towards the molding sand. It is essential that these suction surfaces in the form of sieve surfaces must have smaller openings than the minimum grain size of the molding sand dictates.
  • the suction surfaces are subjected to high temperatures and strong mechanical loads during rough operation of the casting process. They are therefore usually equipped with special support structures. These support structures are intended to prevent the suction surfaces, which are often formed by fine wire screens, from being injured and the molding sand being thereby suctioned off. This would have the consequence that the casting material would penetrate into the molding box.
  • DE-GM 8 029 438 describes a molding box for the vacuum molding process, in which a perforated tube is covered with a fine-mesh wire mesh.
  • the wire mesh is in turn largely covered by perforated metal strips which are fastened to the outside of the wire mesh on the perforated tube.
  • the holes in the metal strips correspond to the holes in the tube.
  • the fine wire mesh used for the screen surface has the decisive disadvantage that the fine wire is very heavily used during the weaving process. Due to the rough casting process, the wire material ages very quickly and tends to break at bending points. This creates holes in the wire mesh that are larger than the minimum grain size. This means that molding sand is extracted.
  • the strong signs of aging on the wire mesh cannot be prevented by the additional protection of the wire mesh with metal strips, at most the mechanical load can be kept away from the wire mesh to a small extent.
  • DE-PS 3 123 363 describes a device for the production of casting molds.
  • vacuum lines are arranged inside the molding box.
  • the vacuum lines are connected to a common vacuum collecting duct on at least one wall of the molding box.
  • a sieving device is interposed, which consists of two sieves lying in parallel, one sieve closing the vacuum collecting duct and the second closing the vacuum lines. Sand is poured between the sieves when the casting mold is made becomes. This is to prevent casting material from penetrating into the molding box in the event of damage to the suction pipes or to the vacuum lines.
  • the invention is based on a vulnerable screen surface of the vacuum lines, as can be represented, for example, by fine wire mesh.
  • the susceptibility to aging of the known wire mesh will appear as a major disadvantage.
  • the effort that is made to avoid possible damage occurring is very high.
  • the molding process can be facilitated by the variability in the attachment of the vacuum line, the molding box is complicated.
  • the air resistance is greatly increased by the additional layer of sand, so that the suction through the vacuum lines and thus a continuous, stable vacuum cannot be ensured.
  • the invention is therefore based on the object of making the design of the suction pipes simpler and cheaper, and in the process of improving their resistance to aging under thermal stress and the mechanical resistance, the build-up of the vacuum in the molding box being in no way impeded.
  • the object is achieved in that the suction surface of the suction pipe and the vacuum lines are formed from parallel profiled wires which form widening gaps in the suction direction.
  • So-called slotted tubes can be used directly as suction tubes.
  • These canned tubes consist of approximately triangular profile wire, the corners of which are rounded.
  • the profile wire is comparable to a coil spring helically wound into a tube. The turns are welded to several rods lying on the inside of the tube. These keep the profile wire apart in the required gap width.
  • the rounded corners of the profile wire create a gap cross-section in the form of a nozzle, which widens towards the inside of the gap tube.
  • the openings of the vacuum lines in the stiffening structure of the molding box and in the molding box itself can be covered with flat, so-called gap filters.
  • several of the profile wires mentioned are welded parallel to one another at a distance of the desired gap width with bars perpendicular to the profile wires.
  • the canned tubes form a very stable unit that is not very sensitive to both mechanical pressure and temperature influences.
  • the dreaded signs of aging in wire mesh can not occur so strongly with solid profile wire.
  • the profile wire is much more resistant to mechanical pressure.
  • the profile wire is welded to the load-bearing bars at each crossing point.
  • a decisive advantage also arises from the fact that the gaps between the individual turns have the cross section of a nozzle. This cross-sectional shape improves the air throughput when the air is extracted from the molding sand. In this way, the suction power required to extract the air from the molding sand can be reduced, and the vacuum is nevertheless reliably maintained everywhere in the casting mold.
  • the aging resistance and the Mechanical stability of the canned tubes allows for a significantly longer service life. This enables considerable cost savings. This means fewer suction pipes, less working time for replacing and repairing them, and ultimately less energy is required to operate the air extraction system.
  • FIG. 1 shows the basic arrangement of a molding box 1 as used in the vacuum molding process.
  • the molding box 1 is provided with a stiffening structure 2 for stabilization.
  • suction pipes 3 are arranged in the molding box cavity.
  • the suction pipes 3 are connected to the frame of the molding box 1, closed towards the center of the molding box and held on the stiffening structure 2.
  • the molding box 1 and the stiffening structure 2 are provided with suction surfaces 5 on their surfaces lying parallel to the suction pipes 3. These suction surfaces 5 are connected to vacuum lines 4 in the molding box 1 and the stiffening structure 2.
  • the basic design of the suction surfaces 5 in the molding box 1 and the stiffening structure 2 and on the suction pipes 3 is shown in FIG. 2.
  • Suction openings can be recognized as column 6 in cross section.
  • the gaps 6 are formed by profile wires 7 which are approximately triangular in cross section.
  • the profile wires 7 are welded onto rods 8 forming a supporting structure.
  • the molding sand 9 lies on the outer, almost smooth surface of the suction pipes 3.
  • the air is sucked out of the molding sand 9 through the widening gaps 6 in the direction of the arrows 10.
  • a high air throughput is achieved. This can be traced back to the nozzle effect of the gap 6.
  • this gap filter is optimally stable. In this way, both the mechanical pressure from the suction and the thermal load when the casting material runs in are absorbed in the best possible way. At the same time, however, a high air throughput with reduced suction power is guaranteed.
  • the vacuum lines 4 are connected via a nozzle 11 to a suction air source, which can be made smaller due to the favorable behavior of the suction pipes 3. This can save energy costs and reduce the noise level.

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)
EP84103898A 1983-05-21 1984-04-07 Châssis pour le moulage à dépression Expired EP0126258B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103898T ATE45112T1 (de) 1983-05-21 1984-04-07 Formkasten fuer das vakuumformverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3318702 1983-05-21
DE3318702A DE3318702C1 (de) 1983-05-21 1983-05-21 Formkasten fuer das Vakuumformverfahren

Publications (3)

Publication Number Publication Date
EP0126258A2 true EP0126258A2 (fr) 1984-11-28
EP0126258A3 EP0126258A3 (en) 1988-01-13
EP0126258B1 EP0126258B1 (fr) 1989-08-02

Family

ID=6199676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103898A Expired EP0126258B1 (fr) 1983-05-21 1984-04-07 Châssis pour le moulage à dépression

Country Status (5)

Country Link
US (1) US4567932A (fr)
EP (1) EP0126258B1 (fr)
JP (1) JPS59220246A (fr)
AT (1) ATE45112T1 (fr)
DE (1) DE3318702C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944901A (en) * 1988-04-14 1990-07-31 Kwok Lloyd A Method of making dental copings
KR960002401B1 (ko) * 1990-11-14 1996-02-17 미쯔비시주우고오교오 가부시기가이샤 코어 및 주형의 제작방법
GB0417634D0 (en) * 2004-08-09 2004-09-08 Structural Polymer Systems Ltd Mould
US10286594B2 (en) 2015-11-25 2019-05-14 Clearcorrect Operating, Llc Batch thermoformer for dental appliances
CN110227801B (zh) * 2019-07-10 2021-01-12 东风汽车有限公司 实型铸造用盖箱

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043376A (en) * 1976-06-16 1977-08-23 Nippon Gakki Seizo Kabushiki Kaisha Casting process by vacuum molding
FR2347995A1 (fr) * 1976-04-14 1977-11-10 Renault Ejecteur filtre auto-decrassant

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US26793A (en) * 1860-01-10 Drain-tile machine
US791111A (en) * 1904-11-07 1905-05-30 Alexis Felix Du Pont Powder-die.
US1768365A (en) * 1927-12-15 1930-06-24 Xylos Rubber Company Cut-off device for extruding machines
BE790852A (fr) * 1971-12-14 1973-02-15 Akita Kk Procede de moulage
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
JPS5512838B2 (fr) * 1973-07-23 1980-04-04
US4009747A (en) * 1974-03-16 1977-03-01 Sintokogio, Ltd. Method of and device for forming vacuum sealed molds
JPS5118216A (ja) * 1974-08-06 1976-02-13 Komatsu Mfg Co Ltd Imonosunakoatsuryokusokuteihoho oyobi sochi
SU846069A1 (ru) * 1978-04-19 1981-07-25 Научно-Исследовательский Институтспециальных Способов Литья Опока дл вакуумной формовки
US4233017A (en) * 1979-01-25 1980-11-11 The Procter & Gamble Company Apparatus for debossing and perforating a running ribbon of thermoplastic film
CH635254A5 (en) * 1979-01-29 1983-03-31 Fischer Ag Georg End-of-travel device comprising a stop
SU929307A2 (ru) * 1980-10-31 1982-05-23 Научно-Исследовательский Институт Специальных Способов Литья Опока дл вакуумной формовки
DE8029438U1 (de) * 1980-11-05 1981-03-19 Passavant-Werke Michelbacher Hütte, 6209 Aarbergen Formkasten fuer das vakuumformverfahren
DE3123363C1 (de) * 1981-06-12 1982-11-04 Heinrich Wagner Maschinenfabrik GmbH & Co, 5928 Laasphe Vorrichtung fuer die Herstellung von Giessformen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347995A1 (fr) * 1976-04-14 1977-11-10 Renault Ejecteur filtre auto-decrassant
US4043376A (en) * 1976-06-16 1977-08-23 Nippon Gakki Seizo Kabushiki Kaisha Casting process by vacuum molding

Also Published As

Publication number Publication date
DE3318702C1 (de) 1984-03-29
EP0126258B1 (fr) 1989-08-02
US4567932A (en) 1986-02-04
ATE45112T1 (de) 1989-08-15
JPS6339334B2 (fr) 1988-08-04
EP0126258A3 (en) 1988-01-13
JPS59220246A (ja) 1984-12-11

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