EP0054731A1 - Procédé et dispositif pour amener un matériau de moulage dans un châssis de moulage - Google Patents

Procédé et dispositif pour amener un matériau de moulage dans un châssis de moulage Download PDF

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Publication number
EP0054731A1
EP0054731A1 EP81109384A EP81109384A EP0054731A1 EP 0054731 A1 EP0054731 A1 EP 0054731A1 EP 81109384 A EP81109384 A EP 81109384A EP 81109384 A EP81109384 A EP 81109384A EP 0054731 A1 EP0054731 A1 EP 0054731A1
Authority
EP
European Patent Office
Prior art keywords
container
molding
membrane
molding compound
molding box
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.)
Withdrawn
Application number
EP81109384A
Other languages
German (de)
English (en)
Inventor
Herbert Grolla
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.)
Heinrich Wagner Maschinenfabrik & Co GmbH
Original Assignee
Heinrich Wagner Maschinenfabrik & Co GmbH
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 Heinrich Wagner Maschinenfabrik & Co GmbH filed Critical Heinrich Wagner Maschinenfabrik & Co GmbH
Publication of EP0054731A1 publication Critical patent/EP0054731A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02—Compacting by pressing devices only
    • B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum

Definitions

  • the invention relates to a method and a device for introducing molding compound, in particular foundry molding compound, into a molding box, a container which is open at the top and containing molding compound being brought under the molding box covered with a model plate, and the molding compound being brought upwards by pressurizing a membrane arranged in the container the molding box is pressed.
  • Foundry molds are usually produced by placing a model plate with a model underneath the molding box and pouring the molding compound into the molding box.
  • the molding compound is pre-compacted by shaking or by shooting the molding compound into the molding box.
  • the molding compound filled into the molding box is recompressed by pressing, using either a rigid press plate or a press device with several partial press plates, in order to achieve a uniform compression of the mold.
  • the invention has for its object to provide a method of the type specified and a device for its implementation in which, while avoiding the disadvantages mentioned, the molding compound is introduced with sufficient compression, in particular also when using non-thermosetting, but only by compression dimensionally stable molding compound is possible.
  • This object is achieved in that the space inside the molding box is pressurized before the membrane is pressurized.
  • the invention is particularly suitable for a method in which the molding compound is pressed into the evacuated molding box by pressurizing the membrane with a pressing pressure sufficient to finally compress the molding compound, the amount of the molding compound preferably being at least as large that it completely fills the molding box after compression.
  • the membrane is moved away from the molding compound into the container by generating a pressure difference between its upper and lower sides, in particular by applying a negative pressure to the lower side of the membrane and ventilating the space above the membrane moved back.
  • An apparatus for carrying out the method according to the invention has a molding box, a model plate which can be placed thereon and a container for molding compound which can be moved into a position below the molding box and which has a membrane and a device for supplying a pressure medium to the underside of the membrane.
  • the device according to the invention is characterized in that at least one opening for the connection of a vacuum source 43 is arranged on the container 3 above the membrane 27 and that means 21, 42 for pressure-tight sealing of the container 3 on the molding box 1 and the molding box on the model plate 16 are provided .
  • a nozzle strip at the upper edge of the membrane container can be provided for the connection to the vacuum source, which can preferably be designed as a hollow frame all around.
  • a device for supplying vacuum to the underside of the membrane is preferably provided.
  • the molding compound is pressed into the evacuated molding box, with pre- and post-pressing being carried out in a single operation.
  • the pressure medium line of the membrane container is connected to a vacuum source, so that the membrane is sucked into the container wall.
  • the membrane container is then moved away to the side, a stripping knife being arranged on the rear side of the membrane container in the direction of movement, which strips the excess molding sand from the molding box.
  • This molding sand falls into the membrane container and can thus be used without reprocessing, since this comes to rest directly on the membrane, i.e. H. is located in an area where it will not come into contact with the model during the next molding process.
  • the membrane container is displaceable between the molding station and a feed station, a molding compound container being arranged at the feed station and being opened and closed by the displacement movement of the membrane container.
  • the membrane container can be moved on rails.
  • the empty mold boxes are also brought up on roller conveyors, these roller conveyors being resiliently mounted in the area of the membrane container, so that when the model plate is placed on the mold boxes, these are moved downwards until they rest pressure-tight on the sealing surfaces of the membrane container.
  • the device according to the invention for filling and compressing molding compound in molding boxes 1 shown in the figures consists of a molding compound container 2, a membrane container 3, a roller conveyor 4 carrying the molding box 1 and a model plate 5 which can be moved vertically.
  • the molding box 1 can be moved on the roller conveyor 4, which is resiliently mounted in the area of the device for introducing and compacting the molding compound 7.
  • the rollers 8 of the roller conveyor 4 are mounted on U-rails 10, which in turn are carried by bolts 9.
  • Springs 11 are arranged between the U-rails 10 and the bolts 9, which allow the U-shaped rails 10 to be displaceable relative to the frame 12 or to a carrier 13 fastened to the frame 12.
  • the bolts 9 are provided with a collar 14 which comes to rest on the support and thus limits the upward displacement.
  • the model plate 5 is mounted so that it can be displaced vertically above the insertion and compression station.
  • the model plate 5 is attached to a plate carrier 16, which in turn is carried by a lifting cylinder 17.
  • This lifting cylinder is mounted in the crossbar 15. Parallel to the lifting cylinder 17, two guide rods 18 are guided in guide bushes 19, which also act on the plate carrier 16.
  • the model plate 5 is provided in a known manner with a model 20 and has a sealing strip 21 on its peripheral edge.
  • This peripheral sealing strip 21 corresponds in its contour to the upper edge 22 of the molding box.
  • the molding compound container 2 which receives the molding compound 7, is also arranged on the frame 12. Below the introduction and compression station and the molding compound container 2, guide rails 23 are arranged on which the membrane container 3 can be displaced by means of rollers 24, 25.
  • the cup-shaped membrane container has on the inside of its wall 26 a membrane 27 which is attached to the edge 28 which is angled outwards.
  • a height-adjustable support plate 29 is arranged in the bottom region 28 between the membrane 27 and the wall 26. This support plate 29 is supported by two set screws 30 which are screwed into threaded bores 31 of the wall 26. With the help of the support plate 29, the volume of the membrane container 3 can be varied so that the molding compound filled into the membrane container corresponds approximately to the amount required for the production of the casting mold.
  • the membrane container 3 is further provided with a vacuum line 32 which opens into the area below the support plate 29.
  • a rotary valve 33 is connected to this vacuum line, via which the vacuum line 32 can optionally be connected to a vacuum source (not shown) 34 or a compressed air source (not shown) 35. The task of this vacuum connection will be explained below.
  • a hydraulic cylinder 36 also acts on the wall 26 of the membrane container 3, with the aid of which the membrane container can be displaced from the position shown in FIG. 1 to the positions shown in FIGS. 2 and 3.
  • a hollow frame 38 is arranged, which has 3 openings 39 to the inside of the membrane container.
  • This hollow frame 38 can be connected via a vacuum connection 43 to a vacuum source, not shown.
  • a sealing plate 40 is attached to the hollow frame 38, which lies in one plane with the hollow frame 38 and serves to close the molding compound container 2 when the membrane container 3 is moved into the position shown in FIG. 2.
  • the membrane container 3 has approximately the same opening as the molding compound container 2. Only on the left side of the molding compound container 2 is the hollow frame 38 shifted outward by a small amount relative to the wall 26 of the membrane container. The reason for this is that a stripping knife 41 is arranged at this point, the function of which will be explained later, which must not impair the filling and emptying process of the membrane container.
  • the molding compound 7 can slide into the membrane container and fill it completely.
  • the amount of molding compound 7 located in the membrane container can be adjusted by adjusting the support plate 29.
  • the membrane container in the drawing is moved to the left into the input and compression station with the aid of the hydraulic cylinder 36.
  • the position after moving is shown in Fig. 2. It can also be seen here that the molding compound container 2 is closed by the sealing plate 40 in this position.
  • the model plate 5 is lowered onto the molding box 1 with the aid of the hydraulic cylinder 17.
  • the sealing strip 21 lies on the upper edge of the molding box 1, so that a pressure-tight closure is obtained.
  • the state shown in FIG. 3 is established.
  • the molding compound 7 is now in the molding box 1 and lies close to the model 20.
  • air pockets are avoided.
  • a sufficient final compaction is achieved overall, so that a dimensionally stable casting mold with conventional foundry molding compound (molding sand and binder) is obtained by the compression process even without thermal curing.
  • the rotary valve 33 is switched over so that the space 28 below the membrane 27 is evacuated between this and the wall 26 of the membrane container 3. Simultaneously or immediately beforehand, the space above the membrane is released to release the vacuum by, for. B. the hollow frame 38 is connected to the atmosphere.
  • the membrane 27 is inevitably moved downward by the pressure difference on its upper and lower sides and then again assumes the position shown in FIG. 1, ie it lies tightly against the wall 26 and the support plate 29.
  • the membrane container 3 is again moved to the right into the position shown in FIG. 1, the molding compound container 2 being opened so that the molding compound 7 can flow into the membrane container 3.
  • Fig. 3 it can be seen that too much molding compound has been pressed into the molding box 1 and compressed. After the diaphragm 27 has been sucked into the wall 26, molding compound 7 still projects beyond the lower edge of the molding box 1. This protruding molding compound is removed by the stripping knife 41 and falls back onto the bottom of the membrane container 3. This molding compound lies at the very bottom of the membrane container, so that it can be used again in the next molding process, without any disruptive influences resulting from the compression which has already taken place once or several times.
  • Fig. 4 the upper edge of the membrane container 3 is shown on an enlarged scale.
  • the stripping knife 41 is pivotally mounted about an axis 45.
  • a spring 46 acts on the stripping knife 41 and engages with its other end on a fixed abutment 47 of the membrane container 3.
  • the device according to the invention for introducing and compacting molding compound into molding boxes has several advantages. On the one hand, only a molding machine with a simple design is required, which does not require a foundation and has a small overall size. In addition, there is no loss of holdup sand that would have to be reprocessed for further use. In addition, turner in the molding system is saved by the upper mold surfaces. In addition, a device according to the invention provides high performance. It takes less than fifteen seconds to form a molding box, so that 240 molds per hour can be produced in a twin molding machine. Due to the above shape division, it is also possible to produce complicated bale models, which is otherwise only economically possible with a turning machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP81109384A 1980-12-20 1981-10-30 Procédé et dispositif pour amener un matériau de moulage dans un châssis de moulage Withdrawn EP0054731A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3048221 1980-12-20
DE19803048221 DE3048221A1 (de) 1980-12-20 1980-12-20 Vorrichtung zur herstellung von giessereiformen

Publications (1)

Publication Number Publication Date
EP0054731A1 true EP0054731A1 (fr) 1982-06-30

Family

ID=6119770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109384A Withdrawn EP0054731A1 (fr) 1980-12-20 1981-10-30 Procédé et dispositif pour amener un matériau de moulage dans un châssis de moulage

Country Status (2)

Country Link
EP (1) EP0054731A1 (fr)
DE (1) DE3048221A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005009648A3 (fr) * 2003-07-24 2005-04-28 Kuenkel Wagner Prozesstechnolo Production de moules compactes avec decoupe du dos assistee
CN102527949A (zh) * 2012-02-15 2012-07-04 浙江省机电设计研究院有限公司 铁型射砂孔清理顶杆自动对准的装置
CN102950519A (zh) * 2012-11-02 2013-03-06 佛山市三水加美实业有限公司业鹏成分公司 可防止水钻粘结粉被刮溢出的负压粉盒装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563643A (en) * 1948-06-09 1951-08-07 Ranek Joseph P De Process for making cores
US2852820A (en) * 1955-03-14 1958-09-23 Taccone Pneumatic Foundry Equi Molding machine with roller strike off
US2882566A (en) * 1959-04-21 redhead
US2956317A (en) * 1957-07-22 1960-10-18 Howard P Peasley Apparatus and method of making molds
FR1256337A (fr) * 1959-05-06 1961-03-17 Knight Engineering Establishme Machine à mouler automatique
GB938996A (en) * 1961-07-19 1963-10-09 Stone Wallwork Ltd Improvements relating to foundry moulding machines
US3293703A (en) * 1962-11-13 1966-12-27 Arthur R Taccone Vacuum molding apparatus
US3620293A (en) * 1969-04-07 1971-11-16 Ernst Otto Kruse Press molding machine with adjustable feed device
FR2278427A1 (fr) * 1974-07-15 1976-02-13 Baker Perkins Holdings Ltd Perfectionnements des procedes de fabrication des moules et noyaux de fonderie

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882566A (en) * 1959-04-21 redhead
US2563643A (en) * 1948-06-09 1951-08-07 Ranek Joseph P De Process for making cores
US2852820A (en) * 1955-03-14 1958-09-23 Taccone Pneumatic Foundry Equi Molding machine with roller strike off
US2956317A (en) * 1957-07-22 1960-10-18 Howard P Peasley Apparatus and method of making molds
FR1256337A (fr) * 1959-05-06 1961-03-17 Knight Engineering Establishme Machine à mouler automatique
GB938996A (en) * 1961-07-19 1963-10-09 Stone Wallwork Ltd Improvements relating to foundry moulding machines
US3293703A (en) * 1962-11-13 1966-12-27 Arthur R Taccone Vacuum molding apparatus
US3620293A (en) * 1969-04-07 1971-11-16 Ernst Otto Kruse Press molding machine with adjustable feed device
FR2278427A1 (fr) * 1974-07-15 1976-02-13 Baker Perkins Holdings Ltd Perfectionnements des procedes de fabrication des moules et noyaux de fonderie

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005009648A3 (fr) * 2003-07-24 2005-04-28 Kuenkel Wagner Prozesstechnolo Production de moules compactes avec decoupe du dos assistee
CN102527949A (zh) * 2012-02-15 2012-07-04 浙江省机电设计研究院有限公司 铁型射砂孔清理顶杆自动对准的装置
CN102527949B (zh) * 2012-02-15 2013-09-25 浙江省机电设计研究院有限公司 铁型射砂孔清理顶杆自动对准的装置
CN102950519A (zh) * 2012-11-02 2013-03-06 佛山市三水加美实业有限公司业鹏成分公司 可防止水钻粘结粉被刮溢出的负压粉盒装置

Also Published As

Publication number Publication date
DE3048221A1 (de) 1982-07-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19830605

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Inventor name: GROLLA, HERBERT