EP0172937B1 - Verfahren zur Herstellung von Sandformen - Google Patents
Verfahren zur Herstellung von Sandformen Download PDFInfo
- Publication number
- EP0172937B1 EP0172937B1 EP19840110351 EP84110351A EP0172937B1 EP 0172937 B1 EP0172937 B1 EP 0172937B1 EP 19840110351 EP19840110351 EP 19840110351 EP 84110351 A EP84110351 A EP 84110351A EP 0172937 B1 EP0172937 B1 EP 0172937B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- sand
- squeezing
- pattern
- mold frame
- 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.)
- Expired
Links
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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
Definitions
- This invention relates to a molding method according to the preamble of claim 1. More specifically it relates to a method of making sand molds having a high hardness particularly at and about pocket areas thereof (pocket areas being those generally located centrally of a sand mold and convexly shaped such as shown by numeral 1 in the accompanying drawing).
- pocket areas being those generally located centrally of a sand mold and convexly shaped such as shown by numeral 1 in the accompanying drawing.
- the frame areas In order to improve a hardness of casting surfaces particularly of pocket areas in addition to those areas of a sand mold which are located between a mold frame and a pattern and roots of which stand on a pattern plate (hereinafter called as the frame areas), it is known in Japanese preliminary patent publication Sho-No.
- a squeezing operation of a sand mold from the lower side is accompanied with the following drawbacks.
- a squeezing stroke from the lower side is made larger so as to increase a squeezing pressure
- a gap is produced inevitably between circumferential sides of a pattern and inner circumferential walls of a mold frame, which allows mold sand to fall down thereto.
- a sealing means has to be provided for the pattern plate in this instance to compensate said gap, whereby the pattern plate becomes expensive.
- an additional lower mold frame is often provided so as to compensate the difference of heights of end surfaces of the mold frame and sand.
- a pattern plate is slightly elevated vertically upward after having a cavity of a mold frame filled up with mold sand and having the sand molded therein pneumatically.
- its molding is operated statically without any dynamic squeezing, and the vertical movement of the pattern plate is made so as to compensate stress of mold sand produced thereby within the mold frame cavity by having the sand escaped portionally from the cavity. This is not comparable to this invention which will be described hereinafter.
- this invention is to provide a novel method of producing sand molds, in which a squeezing operation even of a small stroke from the lower side can afford to casting surfaces of molds, particularly those of pocket areas a desired hardness.
- this invention is to provide a method of making a sand mold in which mold sand within mold frame means is squeezed vertically from both sides thereof, viz., a pattern side at which a pattern is embedded and a side opposite to the pattern side, characterized by the features of the second part of claim 1.
- resulting hardnesses at the area 1 there are shown resulting hardnesses at the area 1, and in Fig. 3 hardnesses at the-area 2.
- ordinates show hardness by AFS (American Foundary Standard) unit, and abscissas stroke ratios.
- Positive numerals on the abscissas show molding operations by squeezing from the upper side, followed by squeezing from the lower side, while negative. numerals show those molding in which the squeezing from the lower side preceded the one from the upper side.
- the stroke ratio being expressed as 60, it is shown that 60% of a total squeezing stroke was made first from the upper side, followed by squeezing from the lower side of the remnant total stroke of 40%.
- squeezing from the lower side of an extremely small amount of stroke compared to that from the upper side can bring about even hardness of sand molds.
- Fig. 4 which shows the first embodiment of this invention method
- a squeeze cylinder 11 upon a squeeze cylinder 11, there are mounted a pattern plate 12 with a pattern 10 on one side thereof, a main mold frame 13, and an upper supplementary or additional frame 14. Mold sand is introduced within the frames 13 and 14 [Fig. 4 (a)]. Then, the squeezing cylinder 11 is moved vertically upward by about 120 mm, whereby squeezing from the upper side is made first by means of segment squeeze heads 15 [Fig. 4 (b)].
- the mold frame 13 together with the upper supplementary frame 14 is elevated about 5 mm by means of lifters 16, leaving the mold sand as it is on the pattern plate [Fig. 4 (c)].
- the lifters 16 are operated by cylinders 17 which move vertically upward and downward.
- the squeeze cylinder 11 is again lifted about 3 mm, whereby squeezing from the lower side is performed and molding is completed.
- Fig. 5 there is shown another embodiment of the lifters 16.
- cylinders 18 which operate horizontally are employed.
- the cylinders 18 actuate brackets 19 so as to rotate, forward ends of which brackets work to elevate the mold frame 13.
- Fig. 6 there is shown the second embodiment of this invention method.
- the mold frame 13 is mounted on the pattern plate 12 with a spacer plate 20 of about 5 mm in thickness therebetween [Fig. 6 (a)].
- a spacer plate 20 of about 5 mm in thickness therebetween.
- Fig. 7 which shows the third embodiment of this invention method
- the mold frame 13 and the supplementary frame 14 are held at their positions by mold- locking cylinders 21, and the squeeze cylinder 11 is lowered about 5 mm so as to have the mold sand slid in relation to the stationarily held mold frame 13 [Fig. 7 (c)].
- squeeze cylinder 11 is elevated again about 3 mm, whereby squeezing from the lower side is effected [Fig. 7 (d)].
- Fig. 8 shows the fourth embodiment of this invention method, in which the mold frame 13 is held by mold frame fixing lifters 22 at an elevated position of a distance of about 5 mm from the pattern plate [Fig. 8 (a)]. Squeezing from the upper side is done by having the segment squeeze heads 15 descended about 120 mm [Fig. 8 (b)]. Then, squeezing from the lower side is made by the elevation of the squeeze cylinder 11 about 3 mm.
- second squeezing from the lower side is made, in this invention, at a small amount of stroke and only after the completion of first squeezing from the upper side which shall have mold sand compacted very tightly before the second squeezing, there is no fear that during the second squeezing, mold sand, bottom part of which is not sustained by a mold frame, shall flow outwardly under the mold frame.
- second squeezing is made only after the completion of first squeezing, casting surfaces which have been tightly compacted outwardly from a pattern by the first squeezing, are further recompacted by the second squeezing inwardly from the pattern so that evenly smooth casting surfaces are obtainable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Claims (7)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8484110351T DE3469278D1 (en) | 1984-08-30 | 1984-08-30 | A method for making sand molds |
EP19840110351 EP0172937B1 (de) | 1984-08-30 | 1984-08-30 | Verfahren zur Herstellung von Sandformen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19840110351 EP0172937B1 (de) | 1984-08-30 | 1984-08-30 | Verfahren zur Herstellung von Sandformen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0172937A1 EP0172937A1 (de) | 1986-03-05 |
EP0172937B1 true EP0172937B1 (de) | 1988-02-10 |
Family
ID=8192135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840110351 Expired EP0172937B1 (de) | 1984-08-30 | 1984-08-30 | Verfahren zur Herstellung von Sandformen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0172937B1 (de) |
DE (1) | DE3469278D1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3740185A1 (de) * | 1987-06-13 | 1989-06-08 | Badische Maschf Gmbh | Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen |
DE3719846A1 (de) * | 1987-06-13 | 1988-12-22 | Badische Maschf Gmbh | Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen |
DE3900324A1 (de) * | 1989-01-07 | 1990-07-12 | Dorstener Maschf Ag | Verfahren und presse zum herstellen von formkernen aus formsand fuer die giessereitechnik |
DK169236B1 (da) * | 1993-07-20 | 1994-09-19 | Dansk Ind Syndikat | Fremgangsmåde ved fremstilling af støbeforme eller dele af sådanne ved sammenpresning af partikelmateriale samt apparat til udøvelse af fremgangsmåden |
WO2001070432A1 (en) * | 2000-03-20 | 2001-09-27 | Georg Fischer Disa A/S | Method and apparatus for producing two-part moulds |
DE60127231T2 (de) * | 2000-04-13 | 2007-07-05 | Sintokogio, Ltd., Nagoya | Kompressionsverfahren für giess-sand und vorrichtung dafür |
CN1311934C (zh) * | 2000-04-21 | 2007-04-25 | 新东工业株式会社 | 带余砂框的模板搬运装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3220066A (en) * | 1961-07-28 | 1965-11-30 | Squeeze molding machine | |
DE1415661A1 (de) * | 1962-09-28 | 1968-10-10 | Carborundum Co | Halbleiter |
US3381740A (en) * | 1965-07-07 | 1968-05-07 | Osborn Mfg Co | Foundry molding machine |
DE1958571A1 (de) * | 1969-11-21 | 1971-06-16 | Statni Vyzkumny Ustav Material | Presskopf einer Giessereiformmaschine |
US3807483A (en) * | 1971-01-08 | 1974-04-30 | E Buhler | Methods and apparatus for producing sand molds |
DE2815951A1 (de) * | 1978-04-13 | 1979-10-18 | Wagner Maschf Heinrich | Giessereiformmaschine |
CH632430A5 (de) * | 1978-10-05 | 1982-10-15 | Inventio Ag | Verfahren und vorrichtung zur herstellung von giessformteilen. |
-
1984
- 1984-08-30 DE DE8484110351T patent/DE3469278D1/de not_active Expired
- 1984-08-30 EP EP19840110351 patent/EP0172937B1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3469278D1 (en) | 1988-03-17 |
EP0172937A1 (de) | 1986-03-05 |
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