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 PDFInfo
- 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
- Authority
- 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
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Description
- 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.
-
Japanese Patent Publication-A No. Hei. 6-277800 U. S. Patent No. 5,409,052 , whose assignee is the same as that of this invention, disclose blow-and-squeeze-type apparatuses for making a mold. In these apparatuses, molding sand in a blow head is supplied into a space, which is made by a flask, a pattern plate, and a squeeze plate, and then the molding sand in that space is compacted by the squeeze plate to make the mold. - When a mold is made by using a blow-and-squeeze-type apparatus for making said mold, there are the following problems: That is, the bulk density of the molding sand that was supplied by being blown-in changes, as the properties and/or conditions of the molding sand change. Therefore, the height of the mold after the molding sand has been squeezed changes. Also, the bulk density of the molding sand after it has been squeezed may change. The reason by which the properties and/or conditions of the molding sand change is that its moisture evaporates when it is carried from a mixer to a blow head by a belt conveyor. Thus, in supplying molding sand by blowing it into a flask, it is difficult to obtain and use molding sand having stable properties and having conditions that are optimal for making a mold.
- To solve the above problems, in the invention disclosed in
U. S. Patent No. 5,409,052 , 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. However, 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. - Thus, 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.
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Fig. 1 is an elevation partly in section of a blow-and-squeeze-type apparatus for making molds, to which apparatus this invention can be applied. -
Fig. 2 is a flowchart that explains this invention. -
Fig. 3 is a graph showing the relation between the percentage of the reduction of the height of molding sand in a flask, ΔL/L, and the compactability, α, of the molding sand in the obtained mold. -
Fig. 4 is a graph showing the relation between the compactability and the moisture content of molding sand when it is discharged from a mixer. -
Fig. 5 is a schematic view of a blow-and-squeeze-type apparatus for making molds, to which apparatus this invention can be applied. - The inventors of this invention have extensively investigated, and tested for solving, the above problems by a different angle from that of the invention disclosed in
U. S. Patent No. 5,409,052 . As a result, they have found that in a blow-and-squeeze-type apparatus for making a mold, as shown inFigure 3 the percentage of the reduction of the distance between a pattern plate and a squeeze plate caused by squeezing molding sand, ΔL/L, which is calculated by dividing the reduced amount of that distance by the molding sand being squeezed, ΔL[ = L (the distance between a pattern plate and a squeeze plate before the molding sand is squeezed) - L' (that distance after the molding sand has been squeezed)], by the distance before the molding sand is squeezed, L, correlates with the compactability. - Based on the above fact, the inventors of this invention have accomplished this invention.
- Thus, 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:
- a) making a mold by supplying molding sand into a space for molding which is defined by the pattern plate, the flask, and the squeeze plate by blowing the molding sand into that space, and then squeezing the molding sand by using the squeeze plate under conditions such that the following conditions are previously set: an optimal sand compactability, α0, a permissible range, ±ε, of the difference between the α0 and the actual sand compactability, α, a number, n, of molds to be made, and a relational formula that represents a correlation between a ratio of a reduced amount, ΔL, which is obtained by subtracting a distance, L', between the pattern plate and the squeeze plate after the molding sand has been squeezed from a distance, L, between them before the molding sand is squeezed, to that distance, L, (that is, a percentage of the reduction of the distance: ΔL/L), and sand compactability;
- b) obtaining said percentage of the reduction of the distance, ΔL/L, and substituting said percentage for said relational formula to calculate the compactability, α, of the molding sand of the obtained mold;
- c) judging whether the difference between said compactability, α, and said optimal compactability, α0, is within said permissible range, ± ε; and
- d) making the next mold when said difference is within said permissible range, or when said difference is outside said permissible range, modifying a condition by transmitting a command to modify a mixing condition of the mixer and then making the next mold,
- 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. - The relational formula that represents the correlation between the percentage of the reduction of the distance: ΔL/L) and compactability is, e.g., y (compactability, %) = 2.75x (ΔL/L, %) - 30.4.
- When the set compactability of the molding sand when it is discharged from said mixer is modified, the amount of water that is mixed with molding sand in the mixer can be calculated using, e.g., the formula: y (moisture content, %) = 0.027x (compactability, %) + 1.67. This formula represents the relational line shown in
Figure 4 . - Below some of the preferable embodiments of this invention will be explained in detail.
-
Figure 1 shows a blow-and-squeeze-type apparatus for making molds, to which apparatus this invention can be applied. This apparatus comprises apattern plate 1, aflask 2, aflask 3, asqueeze plate 6, a squeeze plate 7, and ablow head 8. - The
pattern plate 1 is also called a match plate. Thispattern plate 1 has two patterns, one on its front surface and one on its back surface. Theflasks pattern plate 1. Thesqueeze plates 6 and 7 can be moved by the functions ofcylinders squeeze plates 6 and 7 slide along the inner surfaces of theflasks pattern plate 1, theflask 2, and thesqueeze plate 6, the molding sand S in theblow head 8 is supplied through ablow nozzle 11. Simultaneously, to a space which is defined by thepattern plate 1, theflask 3, and the squeeze plate 7, the molding sand S in theblow head 8 is supplied through ablow nozzle 12. Theblow nozzle 11, which is positioned under theblow head 8 and communicates with it, can be connected to theflask 2 at anopening 9 in the upper wall of theflask 2. Theblow nozzle 12, which is positioned under theblow head 8 and communicates with it, can be connected to theflask 3 at an opening 10 in the upper wall of theflask 3. Theblow nozzles openings blow head 8 to go downward. InFigure 1 , theblow head 8 is at its lowest position. To the upper part of theblow head 8, acommunication pipe 14 is connected. To thispipe 14, a valve is attached for controlling thepressure 13. Thepipe 14 is connected to a compressed air source (not shown). - To the
squeeze plate 6, the top of amovement sensor 15 that is attached to the frame, to which frame thecylinder 4 is fixed, is connected. Thesensor 15 is used to measure the distance that thesqueeze plate 6 moves. Thesensor 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). When 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. - Next, the method for making molds by using the above-explained apparatus will be explained by reference to
Figures 1 and2 . - To the microcomputer, 1) the compactability, αo, that is optimal for making a mold, 2) the permissible range, ± ε, of the difference between the α0 and the actual compactability, α, 3) the number, n, of molds to be made, and 4) the relational formula that represents the correlation between the ratio of the reduced amount, ΔL, and the compactability, are input. Here, ΔL 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: ΔL/L). - Then, compressed air of a predetermined pressure is supplied to the
blow head 8 for a predetermined time through thecommunication pipe 14. During this period, theblow head 8 is positioned at the position shown inFigure 1 . By supplying the compressed air to theblow head 8, the molding sand S is blown into the space that is defined by thepattern plate 1, theflask 2, and thesqueeze plate 6, through theblow nozzle 11 that is connected to theopening 9, and into the space that is defined by thepattern plate 1, theflask 3, and the squeeze plate 7, through theblow nozzle 12 that is connected to theopening 10. - Next, the
cylinders squeeze plates 6, 7 at a predetermined pressure to compress or squeeze the molding sand S that has been supplied. Thus, two molds are made. Then, the molds are detached from thepattern plate 1 andflasks - By the microcomputer, the compactability of the mold that was made in the
flask 2 is calculated. That is, by subtracting the distance, L', between thepattern plate 1 and thesqueeze 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, ΔL, is given. Then, from the relational formula that represents the correlation between the percentage of the reduction of the distance, Δ L/L, and the compactability, the actual compactability, α, of the molding sand S constituting the mold thus obtained is calculated. The relational formula is, for example, "y (compactability, %) = 2.75x (ΔL/L, %) - 30.4," as shown inFigure 3 . - Next, by the microcomputer, whether the difference between the actual compactability, α, and the optimal compactability, α0, is within the permissible range, ±ε, is judged. When the difference is within the permissible range, ±ε, the next molds are made without changing any condition. When the difference is outside the permissible range, ±ε, depending on the conditions of the obtained mold, 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. Specifically, to modify the set compactability of the molding sand S when it is discharged from 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, is modified. However, the compactability of the molding sand S when it is discharged from the mixer is most affected by the amount of water. Further, as shown in
Figure 4 , 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. Thus, the modification of the set compactability is usually realized by the modification of the amount of water. - In the mixer, the molding sand S is prepared so as to have a compactability that is higher than the optimal compactability, α0, 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.
- For each set of molds made, the actual compactability, α, is calculated and is compared to the optimal compactability, αo. As previously explained, if necessary, that is, if the actual compactability, α, is outside the permissible range, ± ε, any condition that needs to be modified should be so modified before the next set of molds is made. Thus, a previously set number, n, of molds are made.
- In the apparatus shown in
Figure 1 , two molds are simultaneously made. However, 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 thepattern plate 1 is also not limited. This invention can also be applied to, e.g., the apparatus shown inFigure 5 , in which thepattern plate 1 has two patterns, one on the upper surface and one on lower surface of it. - In this invention, from the values that are obtained by measuring the height (or thickness) of the molding sand in a flask, 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.
Claims (1)
- 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, comprising the steps of:a) making a mold by supplying molding sand into a space for molding which is defined by the pattern plate, the flask, and the squeeze plate by blowing the molding sand into that space, and then squeezing the molding sand by using the squeeze plate under conditions such that the following conditions are previously set: an optimal sand compactability, α0, a permissible range, ±ε, of the difference between the α0 and the actual sand compactability, α, a number, n, of molds to be made, and a relational formula that represents a correlation between a ratio of a reduced amount, ΔL, which is obtained by subtracting a distance, L', between the pattern plate and the squeeze plate after the molding sand is squeezed from a distance, L, between them before the molding sand is squeezed, to that distance, L, (that is, a percentage of the reduction of the distance: ΔL/L), and sand compactability;b) obtaining said percentage of the reduction of the distance, Δ L/L, and substituting said percentage for said relational formula to calculate the compactability, α, of the molding sand of the obtained mold;c) judging whether the difference between said compactability, α, and said optimal compactability, α0, is within said permissible range, ±ε; andd) making the next mold when said difference is within said permissible range, or when said difference is outside said permissible range, modifying a condition by transmitting a command to modify a mixing condition of the mixer and then making the next mold,thereby making molds of a previously set number, n.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2691299 | 1999-02-04 | ||
JP02691299A JP4092673B2 (en) | 1999-02-04 | 1999-02-04 | Mold making method in blow squeeze mold making machine |
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 (en) |
JP (1) | JP4092673B2 (en) |
DE (1) | DE60010137T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6042594B2 (en) * | 2010-11-26 | 2016-12-14 | 新東工業株式会社 | Raw mold making method |
CN107206484B (en) * | 2015-03-10 | 2019-04-26 | 新东工业株式会社 | The casting process management method of character based on molding sand |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991014525A1 (en) * | 1990-03-20 | 1991-10-03 | Dansk Industri Syndikat A/S | A method for producing a series of casting molds or mold parts, and an apparatus for carrying out the method |
JPH0641942U (en) * | 1992-11-27 | 1994-06-03 | 新東工業株式会社 | Simultaneous molding machine for upper and lower molds |
-
1999
- 1999-02-04 JP JP02691299A patent/JP4092673B2/en not_active Expired - Lifetime
-
2000
- 2000-02-04 EP EP20000102465 patent/EP1025927B2/en not_active Expired - Lifetime
- 2000-02-04 DE DE2000610137 patent/DE60010137T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2000225440A (en) | 2000-08-15 |
EP1025927B1 (en) | 2004-04-28 |
JP4092673B2 (en) | 2008-05-28 |
EP1025927A1 (en) | 2000-08-09 |
DE60010137D1 (en) | 2004-06-03 |
DE60010137T2 (en) | 2004-09-09 |
DE60010137T3 (en) | 2009-09-24 |
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