EP1025927B2 - Method for making sand molds in a blow-and-squeeze-type apparatus - Google Patents

Method for making sand molds in a blow-and-squeeze-type apparatus Download PDF

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Publication number
EP1025927B2
EP1025927B2 EP20000102465 EP00102465A EP1025927B2 EP 1025927 B2 EP1025927 B2 EP 1025927B2 EP 20000102465 EP20000102465 EP 20000102465 EP 00102465 A EP00102465 A EP 00102465A EP 1025927 B2 EP1025927 B2 EP 1025927B2
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EP
European Patent Office
Prior art keywords
compactability
molding sand
mold
making
squeeze
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 - Lifetime
Application number
EP20000102465
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German (de)
English (en)
French (fr)
Other versions
EP1025927B1 (en
EP1025927A1 (en
Inventor
Eiji c/o Sintokogio Ltd. Naruse
Takayuki c/o Sintokogio Ltd. Komiyama
Shin c/o Sintokogio Ltd. Matsuzawa
Masatoshi c/o Sintokogio Ltd. Matsushita
Hiroyasu c/o Sintokogio Ltd. Makino
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.)
Sintokogio Ltd
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Sintokogio Ltd
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
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Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP1025927A1 publication Critical patent/EP1025927A1/en
Publication of EP1025927B1 publication Critical patent/EP1025927B1/en
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Publication of EP1025927B2 publication Critical patent/EP1025927B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B22C19/04—Controlling devices specially designed for moulding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • This invention relates to a method for making a mold in an apparatus of a blow-and-squeeze-type for making said mold, which apparatus comprises a pattern plate, a flask, a squeeze plate, and a blow head.
  • a height (or thickness) of a mold after it has been squeezed is calculated from the distance that the squeeze plate has moved, the moisture of the molding sand is calculated from the electrical resistance, which is measured by using an electrode that is attached to the squeeze plate, and the height (or thickness) of the mold and the moisture of the molding sand are used as data for controlling the properties and conditions of the molding sand before it is supplied to the blow head and for controlling the conditions of the apparatus for making a mold.
  • the properties and conditions of the mold and the molding sand of that mold which are obtained by practicing that invention, are not necessarily satisfactory.
  • the object of this invention is to provide a method for making a mold in a blow-and-squeeze-type apparatus for making said mold, by which method a mold can be made under conditions suitable for making it.
  • the object can be attained for the reason that in this invention even if any property or condition of the molding sand before it is supplied to the blow head changes, the effects caused by such change can be rectified, and thus molds having desired and suitable properties can be obtained.
  • this invention provides a method for making a mold in a blow-and-squeeze-type apparatus for making said mold, which apparatus comprises a pattern plate, a flask, a squeeze plate, and a blow head.
  • the method comprises the steps of:
  • the modification(s) of the mixing condition of the mixer can be that of the set compactability of the molding sand when it is discharged from said mixer, and that of any other condition(s) necessary to realize the modification of the set compactability.
  • the condition(s) to realize the modification of the set compactability comprises, e.g., the amount of water that is mixed with molding sand, since it has been well known that (as in Figure 4 ) the compactability of molding sand correlates with its moisture content.
  • the condition to realize the modification of the set compactability also comprises the temperature and humidity in the plant, and the temperature of the sand.
  • This formula represents the relational line shown in Figure 4 .
  • Figure 1 shows a blow-and-squeeze-type apparatus for making molds, to which apparatus this invention can be applied.
  • This apparatus comprises a pattern plate 1, a flask 2, a flask 3, a squeeze plate 6, a squeeze plate 7, and a blow head 8.
  • the pattern plate 1 is also called a match plate.
  • This pattern plate 1 has two patterns, one on its front surface and one on its back surface.
  • the flasks 2 and 3 can be set to match the pattern plate 1.
  • the squeeze plates 6 and 7 can be moved by the functions of cylinders 4 and 5, respectively.
  • the squeeze plates 6 and 7 slide along the inner surfaces of the flasks 2 and 3.
  • the molding sand S in the blow head 8 is supplied through a blow nozzle 11.
  • the molding sand S in the blow head 8 is supplied through a blow nozzle 12.
  • the blow nozzle 11, which is positioned under the blow head 8 and communicates with it, can be connected to the flask 2 at an opening 9 in the upper wall of the flask 2.
  • the blow nozzle 12, which is positioned under the blow head 8 and communicates with it, can be connected to the flask 3 at an opening 10 in the upper wall of the flask 3.
  • the blow nozzles 11 and 12 can be inserted into openings 9 and 10, respectively, by causing the blow head 8 to go downward.
  • the blow head 8 is at its lowest position.
  • a communication pipe 14 is connected to this pipe 14, a valve is attached for controlling the pressure 13.
  • the pipe 14 is connected to a compressed air source (not shown).
  • a movement sensor 15 that is attached to the frame, to which frame the cylinder 4 is fixed, is connected.
  • the sensor 15 is used to measure the distance that the squeeze plate 6 moves.
  • the sensor 15 outputs data on the distance value to a microcomputer (not shown).
  • This microcomputer is set to transmit one command and S) namely the set compactability of the molding sand S when the molding sand S is discharged from a mixer for making the molding sand S (not shown).
  • the set compactability is to be modified, to realize the modification any other condition(s) that relates to the set compactability, e.g., the amount of water, is simultaneously modified.
  • ⁇ L is obtained by subtracting the distance, L', between the pattern plate 1 and the squeeze plate 6 (7) after the molding sand S has been squeezed from the distance, L, between them before the molding sand S is squeezed, to that distance, L, (that is, a percentage of the reduction of the distance: ⁇ L/L).
  • the cylinders 4, 5 simultaneously move the squeeze plates 6, 7 at a predetermined pressure to compress or squeeze the molding sand S that has been supplied.
  • two molds are made.
  • the molds are detached from the pattern plate 1 and flasks 2, 3.
  • the molds are treated as usual.
  • the compactability of the mold that was made in the flask 2 is calculated. That is, by subtracting the distance, L', between the pattern plate 1 and the squeeze plate 6 after the molding sand S has been squeezed from the distance, L, between them before the molding sand S is squeezed, the reduced amount, ⁇ L, is given. Then, from the relational formula that represents the correlation between the percentage of the reduction of the distance, ⁇ L/L, and the compactability, the actual compactability, ⁇ , of the molding sand S constituting the mold thus obtained is calculated.
  • the microcomputer determines whether the difference between the actual compactability, ⁇ , and the optimal compactability, ⁇ 0, is within the permissible range, ⁇ .
  • the difference is within the permissible range, ⁇
  • the next molds are made without changing any condition.
  • the microcomputer transmits a command that a condition for making mold be modified.
  • the condition to be modified includes a condition(s) of making the molding sand S in the mixer.
  • one of the mixing conditions e.g., the amount of water, or the temperature of the sand as the raw material, or the formula of the raw materials, or the temperature and humidity in the room where the mixer is set.
  • the compactability of the molding sand S when it is discharged from the mixer is most affected by the amount of water.
  • the correlation between the compactability (which may be calculated as explained above or which may be obtained by the standard method) and the moisture content is known.
  • the modification of the set compactability is usually realized by the modification of the amount of water.
  • the molding sand S is prepared so as to have a compactability that is higher than the optimal compactability, ⁇ 0, because during the period the molding sand S is being carried from the mixer to the blow head, the molding sand S is dried, and thus its compactability is reduced.
  • the intended compactability of the molding sand S that is prepared in the mixer is the set compactability.
  • the mixing conditions can be modified only when a new batch of the molding sand S is prepared.
  • the actual compactability, ⁇ is calculated and is compared to the optimal compactability, ⁇ o.
  • ⁇ o the optimal compactability
  • any condition that needs to be modified should be so modified before the next set of molds is made.
  • n a previously set number, of molds are made.
  • the number of molds that can be simultaneously made is not limited.
  • This invention can also be applied to, e.g., an apparatus by which at one time only one mold, or three or more molds, are made.
  • the direction of the pattern plate 1 is also not limited.
  • This invention can also be applied to, e.g., the apparatus shown in Figure 5 , in which the pattern plate 1 has two patterns, one on the upper surface and one on lower surface of it.
  • the compactability of the molding sand of the obtained mold is easily calculated. Therefore, whether the compactability is within the permissible range can be promptly judged. Further, if the compactability is outside the permissible range, the next mold can be made after a mixing condition of the mixer has been modified. Thus, even though the properties and conditions of the molding sand change, molds having desired and suitable properties and conditions can be steadily made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP20000102465 1999-02-04 2000-02-04 Method for making sand molds in a blow-and-squeeze-type apparatus Expired - Lifetime EP1025927B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP02691299A JP4092673B2 (ja) 1999-02-04 1999-02-04 ブロースクイズ式鋳型造型機における鋳型造型方法
JP2691299 1999-02-04

Publications (3)

Publication Number Publication Date
EP1025927A1 EP1025927A1 (en) 2000-08-09
EP1025927B1 EP1025927B1 (en) 2004-04-28
EP1025927B2 true EP1025927B2 (en) 2009-05-06

Family

ID=12206439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000102465 Expired - Lifetime EP1025927B2 (en) 1999-02-04 2000-02-04 Method for making sand molds in a blow-and-squeeze-type apparatus

Country Status (3)

Country Link
EP (1) EP1025927B2 (ja)
JP (1) JP4092673B2 (ja)
DE (1) DE60010137T3 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6042594B2 (ja) * 2010-11-26 2016-12-14 新東工業株式会社 生型造型方法
JP6443534B2 (ja) * 2015-03-10 2018-12-26 新東工業株式会社 鋳型砂の性状による鋳造工程管理方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH689634A5 (fr) * 1990-03-20 1999-07-30 Dansk Ind Syndikat Procédé pour produire une série de moules ou de parties de moules de fonderie et un appareil pour mettre en oeuvre le procédé.
JPH0641942U (ja) * 1992-11-27 1994-06-03 新東工業株式会社 上下鋳型同時造型装置

Also Published As

Publication number Publication date
EP1025927B1 (en) 2004-04-28
EP1025927A1 (en) 2000-08-09
DE60010137T2 (de) 2004-09-09
DE60010137T3 (de) 2009-09-24
DE60010137D1 (de) 2004-06-03
JP2000225440A (ja) 2000-08-15
JP4092673B2 (ja) 2008-05-28

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