CA1127823A - Method of and apparatus for molding a drag mold part - Google Patents
Method of and apparatus for molding a drag mold partInfo
- Publication number
- CA1127823A CA1127823A CA334,658A CA334658A CA1127823A CA 1127823 A CA1127823 A CA 1127823A CA 334658 A CA334658 A CA 334658A CA 1127823 A CA1127823 A CA 1127823A
- Authority
- CA
- Canada
- Prior art keywords
- drag
- pattern
- compressed air
- molding flask
- molding
- 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
Classifications
-
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A novel method of molding a drag mold part by passing compressed air through molding sand placed in a space defined by a molding flask and a pattern to compact and consolidate the molding sand in the vicinity of the pattern, and thereafter squeezing the molding sand as a whole by means of a squeeze plate, and a novel apparatus used for this method. This method permits the molding sand to be compacted and consolidated to a high density even in deep recesses defined in the pattern itself and defined between the pattern and molding flask, and joining a formed drag mold part without turning it upside down.
A novel method of molding a drag mold part by passing compressed air through molding sand placed in a space defined by a molding flask and a pattern to compact and consolidate the molding sand in the vicinity of the pattern, and thereafter squeezing the molding sand as a whole by means of a squeeze plate, and a novel apparatus used for this method. This method permits the molding sand to be compacted and consolidated to a high density even in deep recesses defined in the pattern itself and defined between the pattern and molding flask, and joining a formed drag mold part without turning it upside down.
Description
- ~27~323 The presenk invention relates to a method of moldïng a mold, particularly to a method of molding a drag mold part, wherein the drag mold part is produced ~:
5 by a mold forming method comprising steps of passing :
compressed air through molding sand filled in a spacè
defined by a molding flask and a pattern to compact and consolidate the molding sand, particular to the molding sand in the vicinity of the pattern, and then squeezing the molding sand as a whole by means of a squeeze plate.
The present invention also relates to an apparatus used for the method.
There have been problems :in the production of cope and drag mold parts by the above mentioned mold forming method, in case of using a match plate type pattern; that is: Nhen the molding sand is floated and moved under a high pressure, toward the pattern defin- ~`
ing a deep recess in itself or between itself and the molding flask in the production of the drag mold part, the molding sand is not sufficiently attached to the surface of the pattern, while when the molding sand is floated under a low pressure, the portion of the molding sand which is in the vicinity of the pattern is not compacted to a high density so that the mold formed
5 by a mold forming method comprising steps of passing :
compressed air through molding sand filled in a spacè
defined by a molding flask and a pattern to compact and consolidate the molding sand, particular to the molding sand in the vicinity of the pattern, and then squeezing the molding sand as a whole by means of a squeeze plate.
The present invention also relates to an apparatus used for the method.
There have been problems :in the production of cope and drag mold parts by the above mentioned mold forming method, in case of using a match plate type pattern; that is: Nhen the molding sand is floated and moved under a high pressure, toward the pattern defin- ~`
ing a deep recess in itself or between itself and the molding flask in the production of the drag mold part, the molding sand is not sufficiently attached to the surface of the pattern, while when the molding sand is floated under a low pressure, the portion of the molding sand which is in the vicinity of the pattern is not compacted to a high density so that the mold formed
2~ '3 does not have a suEficient hardness.
Therefore, it has heretofore been considered impossible to make a complicated form of a drag mold part simultaneously with a cope mold part by the above mentioned molding method.
An object of the present invention is to eliminate the above-mentioned inconveniences.
To this end, the present invention provides a method of producing a drag mold part, comprising the steps of placing molding sand in a space defined by a drag molding flask and a squeeze plate slidably disposed in said drag molding flask, said squeeze plate being provided with a means for blowing compressed air in the upward direction, joining a pattern having a plurality of air discharge bores to the upper end of said drag molding flask in which the molding sand is placed, blowing first compressed air from said blowing means provided in said squeeze plate so as to move the molding sand upwardly toward said pattern, blowing from said blowing means second compressed air at a flow rate or pressure greater than that of said first compressed air so as to increase the density of the molding sand in the vicinity of said pattern, and upwardly moving said squeeze plate to squeeze the molding sand as a whole.
The invention also provides an apparatus for producing a drag mold part, comprising a vertically movable drag molding flask, a squeeze plate slidably fitted in said drag molding flask, a pattern having a plurality of air discharge bores and arranged to fit in said drag molding flask, means for carrying said pattern above said drag molding flask, means for upwardly moving said drag molding flask to fit the same with said pattern thereon, means, ' ', ' ' ~
z~
provided in said squeeze plate, for blowing compressed air, and means for selectively feeding to said flowing means compressed air at a different flow rate or pressure, respectively.
The above and other objects as well as advantageous features of the invention will become clear from the following description of the preferred -2a-~, ~
1 embodiment taken in conunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. 1-3 are partially omitted sectional views i]lustrating the mold-making steps in a method according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIl~ENT
An embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to the drawings, reference numeral 1 denotes a drag upset frame which can be vertically moved by cylinders 2. In the lower opening of the drag upset frame 1, a squeeze plate 5 secured to an upwardly movable piston rod 4 is fitted. An air-tight seal 5a is fitted around the peripheral wall of the squeeze plate 5 so that the later is air tightly fitted into the drag upset frame 1. The squeeze plate 5 has an upper and a lower walls defining a chamber 6 and air flowing bores 7 in the upper wall through which the chamber 6 communicates with the outside. The lower wall of the squeeze plate 5 has another bore 8 through which compressed air is fed thereinto. To the air feed bore 8, a flexible conduit 9 is connected, and the flexible conduit 9 is in turn connected to a compressed air source (not shown) via a main piping system 12 including a shut-off valve 10 and a flow regulating .
.
, ., . ., ; :
., . :
B2~3 1 valve 11.
The main piping system 12 is connected with a first by-pass piping system 13 which is branched-off from the main piping system 12 upstream of the flow regulating valve 11 to bypass the valves 11, 10 and then is jointed to the main piping system 12 down stream of the shut-off valve 10. The first by-pass piping system 13 is provided with a first by-pass shut-off valve 10a and with a first by-pass flow regulating valve lla upstream of the first by-pass shut-off valve lOa. The first by-pass piping system 13 is in turn connected a by~pass piping system 14 which is branched-off from the first by-pass piping system 13 upstream of the flow regulating valve lla to bypass the valves lla, 10a and is jointed to the first by-pass piping system 13 downstream of the first by-pass shut-off valve 10a.
The second by-pass piping system 14 is further provided with a second by-pass shut-off valve lOb and with a second by-pass flow regulating valve llb upstream of the second by-pass shut-off valve 10b.
Above the drag upset frame l, hollow roller conveyors 15 are disposed, which are spaced from each other such that the drag upset frame 1 can be upwardly moved therebetween. The hollow roller conveyors 15 are provided thereon with a drag molding flask 16 which can be brought to and away from the upper surface of the drag upset frame 1.
On the drag molding flask 16, a match plate type :: . . .
:
1 pattern 17 is disposed, which can be moved onto and away from the drag molding flask 16 on the side opposed to the drag upset frame l; that is: the upper side as seen in the drawings. The pattern 17 has a recess 19 defined in itself and recesses 18 defined between itself and the molding flask 16, which are difficult to be filled with molding sand, and also an upper and a lower patterns defining therebetween a chamber 20 which is communicated with the outside. The pattern 17 is further provided in -the lower pattern thereof with narrow passages 21 communicated with the chamber 20.
The passages 21 are positioned in a larger number in the bottoms of the recesses 18, 19, than the other portions thereof. In the passages 21, vent plugs (not shown) are fitted.
The flow regulating valve 11 is adjusted so as to supply compressed air at such a rate that is enough for the molding sand 23 to be upwardly conveyed at a low speed with compressed air blown from the squeeze plate 5. The regulating valve lla is adjusted so as to supply compressed air at such a large rate that is enough to generate a high pressure in the molding sand 23 due to the pressure losses in the molding sand 23 and passages 21. The flow regulating valve llb is adjusted so as to supply air at such a rate that is enough to prevent the raised molding sand 23 from dropping.
In the accompanying drawings, a cope molding flask, an upper drag upset frame, and an upper squeeze _ ~ _ ~ ' :, ", , , :: - ~ ' ' 1 plate which are to be mounted on the pattern 17 are omitted to make simple the examination of the present invention.
In an apparatus having the above-described construction, a drag molding flask 16 is moved by the roller conveyors 15 just above a drag upset frame into which a squeeze plate 5 is fitted. Cylinders 2, 2, 3 are then actuated to upwardly move the drag upset frame 1 and the squeeze plate 5 to lift the drag molding flask 16 from the roller conveyors 15 to a small extent and then stop the same. A predetermined amount of molding sand 23 is thereafter fed from a hopper (not shown) into a space defined by the drag upset frame 1, the squeeze plate 5 and the drag molding flask 16, and ].5 subsequently, a pattern 17 is mo~ed to the upper portion of the drag molding flask 16. The cylinders 2, 2, 3 are then actuated to press the drag molding flask 16 against the lower surface of the pattern 17 as shown in Fig. 1.
The valve 10 is opened for a predetermined period of time so as to flow compressed air from the compressed air source onto the molding sand 23 via the conduit 9, the feed bore 8, the chamber 6, and the air flowing bores 7.
The compressed air flow by the above-mentioned operation serves to upwardly move the molding sand 23 at a low speed. The molding sand 23 flows much, especially, into a recess 18 having many narrow passages in its bottom to allow the recesses 18, 19 ~'7~3 1 to be filled with the molding sand 23. The compressed air is then discharged outside via the passages 21 and the chamber 20.
Accordingly, the molding sand 23 strongly impinges upon projections on the pattern 17 so as to be forced into the recesses 18, 19 without being !' solidified so that the density of the molding sand 23 is increased in the recesses 18, 19.
When the valve 10 is then closed while opening the valve lOa for a predetermined period of time, compressed air is flown in the same manner as mentioned above.
This compressed air is of a large capacity to generate a high pressure under the molding sand 23. Therefore, the density of the molding sand 23 which is close to the surface of the pattern 17 is increased much and the sand ls then solidified. (Refer to Fig. 2.) When the valve lOa is closed while holding the second by-pass shut-off valve lOb the piston rod 4 in the cylinder 3 is extended and thereby upwardly move the squeeze plate 5 so that the molding sand 23 as a whole is squeezed. (Refer to Fig. 3.) The dropping of the molding sand 23 is prevented by the opening of the second by-pass shut-off valve lOb. This condition is continued until a squeezing operation by the squeeze plate 5 has started. In the case where there is no possibility of dropping of the molding sand, a second by-pass piping system 14 having the second by-pass shut-off valve lOb and the second by-pass flow regulating . .
:~27~23 1 valve llb, may be omitted.
The purpose of a squeezing operation which is conducted in the above-mentioned manner is to consolidate the molding sand which is not sufficiently consolidated other than such a portion thereof which is highly consolidated with the compressed air along the surface of the pattern 17. This squeezing operation works a little to the molding sand which has been highly consolidated by compressed air.
When the cylinders 2, 2, 3 are backwardly moved to lower the drag upset frame 1 and the squeeze plate 5, the drag molding flask 16 is removed from the pattern 17 to be returned on the roller conveyors 15.
At this time, a drag mold part has been formed in the drag molding flask 16.
This molding flask removing operation can be easily conducted by introducing compressed air onto the molding sand 23 through the passages 21. ~or this purpose, another piping system 14a including a three-way valve lOc is provided between the passages 21 and the second by-pass system 14. The drag upset frame 1 and the squeeze plate 5 are removed from the drag molding flask 16 when they are do~nwardly rnoved to a small extent.
The drag mold part with the molding flask which is returned on the roller conveyors 15 is transferred to a mold combining position without being upside down.
The drag mold part is then joined to an upper mold part ` ~
1 which has been molded on the pattern 17 at the same time (description will be omitted), so as to ~orm a complete mold.
Onto the drag upset frame 1 which a drag mold part with the molding flask has been brought away, a new empty drag molding flask is introduced, and the above-mentioned operation is repeated]y conducted.
In the above embodiment, the drag molding flask 16 is moved onto and removed from the upper surface of the drag upset frame 1 to form a drag mold part.
However, the drag upset frame 1 can be eliminated so that the squeeze plate 5 is directly fitted into the drag molding flask 16. In this case, the mold which has been completed is removed from the molding flask 16.
In the embodiment, the flow rate of the compressed air supplied through the squeeze plate 5 is regulated but the same e~fect can be obtained by regulating the pressure thereof.
Although the shut-off valve lO is closed simultaneously with the first by-pass shut-off valve 10a in the above embodiment, the shut-off valve 10 may be kept opened.
As may be clearly noted from the above description, a method according to the present invention comprises of flowing compressed air at such a rate that is enough for molding sand to be upwardly moved at a low speed from the squeeze plate so as to force the molding sand into deep recesses defined in a pattern; subsequently l flowing a large amount of compressed air to compact and consolidate to a high density the molding sand which is close to a pattern; and thereafter squeezing the molding sand as a whole by the squeeze plate to consolidate the whole of the molding sand. Accordingly, in spite o~ the fact that the deep recesses are provided in the pattern and formed between the pattern and the molding flask, the molding sand can be fully introduced thereinto and is compacted and consolidated to a high density. ~ method according to the present invention has an extremely high effect especially when it is applied to the production of a drag mold part by using a match plate type pattern. In addition, a drag mold part produced can be joined without turning it upside down.
This serves to prevent a mold from being hurt while it is handled.
The present invention is not, of course, limited to the above embodiment; it may be modified in various ways within the scope of the appended claims.
.
Therefore, it has heretofore been considered impossible to make a complicated form of a drag mold part simultaneously with a cope mold part by the above mentioned molding method.
An object of the present invention is to eliminate the above-mentioned inconveniences.
To this end, the present invention provides a method of producing a drag mold part, comprising the steps of placing molding sand in a space defined by a drag molding flask and a squeeze plate slidably disposed in said drag molding flask, said squeeze plate being provided with a means for blowing compressed air in the upward direction, joining a pattern having a plurality of air discharge bores to the upper end of said drag molding flask in which the molding sand is placed, blowing first compressed air from said blowing means provided in said squeeze plate so as to move the molding sand upwardly toward said pattern, blowing from said blowing means second compressed air at a flow rate or pressure greater than that of said first compressed air so as to increase the density of the molding sand in the vicinity of said pattern, and upwardly moving said squeeze plate to squeeze the molding sand as a whole.
The invention also provides an apparatus for producing a drag mold part, comprising a vertically movable drag molding flask, a squeeze plate slidably fitted in said drag molding flask, a pattern having a plurality of air discharge bores and arranged to fit in said drag molding flask, means for carrying said pattern above said drag molding flask, means for upwardly moving said drag molding flask to fit the same with said pattern thereon, means, ' ', ' ' ~
z~
provided in said squeeze plate, for blowing compressed air, and means for selectively feeding to said flowing means compressed air at a different flow rate or pressure, respectively.
The above and other objects as well as advantageous features of the invention will become clear from the following description of the preferred -2a-~, ~
1 embodiment taken in conunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figs. 1-3 are partially omitted sectional views i]lustrating the mold-making steps in a method according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIl~ENT
An embodiment of the present invention will be described with reference to the accompanying drawings.
Referring to the drawings, reference numeral 1 denotes a drag upset frame which can be vertically moved by cylinders 2. In the lower opening of the drag upset frame 1, a squeeze plate 5 secured to an upwardly movable piston rod 4 is fitted. An air-tight seal 5a is fitted around the peripheral wall of the squeeze plate 5 so that the later is air tightly fitted into the drag upset frame 1. The squeeze plate 5 has an upper and a lower walls defining a chamber 6 and air flowing bores 7 in the upper wall through which the chamber 6 communicates with the outside. The lower wall of the squeeze plate 5 has another bore 8 through which compressed air is fed thereinto. To the air feed bore 8, a flexible conduit 9 is connected, and the flexible conduit 9 is in turn connected to a compressed air source (not shown) via a main piping system 12 including a shut-off valve 10 and a flow regulating .
.
, ., . ., ; :
., . :
B2~3 1 valve 11.
The main piping system 12 is connected with a first by-pass piping system 13 which is branched-off from the main piping system 12 upstream of the flow regulating valve 11 to bypass the valves 11, 10 and then is jointed to the main piping system 12 down stream of the shut-off valve 10. The first by-pass piping system 13 is provided with a first by-pass shut-off valve 10a and with a first by-pass flow regulating valve lla upstream of the first by-pass shut-off valve lOa. The first by-pass piping system 13 is in turn connected a by~pass piping system 14 which is branched-off from the first by-pass piping system 13 upstream of the flow regulating valve lla to bypass the valves lla, 10a and is jointed to the first by-pass piping system 13 downstream of the first by-pass shut-off valve 10a.
The second by-pass piping system 14 is further provided with a second by-pass shut-off valve lOb and with a second by-pass flow regulating valve llb upstream of the second by-pass shut-off valve 10b.
Above the drag upset frame l, hollow roller conveyors 15 are disposed, which are spaced from each other such that the drag upset frame 1 can be upwardly moved therebetween. The hollow roller conveyors 15 are provided thereon with a drag molding flask 16 which can be brought to and away from the upper surface of the drag upset frame 1.
On the drag molding flask 16, a match plate type :: . . .
:
1 pattern 17 is disposed, which can be moved onto and away from the drag molding flask 16 on the side opposed to the drag upset frame l; that is: the upper side as seen in the drawings. The pattern 17 has a recess 19 defined in itself and recesses 18 defined between itself and the molding flask 16, which are difficult to be filled with molding sand, and also an upper and a lower patterns defining therebetween a chamber 20 which is communicated with the outside. The pattern 17 is further provided in -the lower pattern thereof with narrow passages 21 communicated with the chamber 20.
The passages 21 are positioned in a larger number in the bottoms of the recesses 18, 19, than the other portions thereof. In the passages 21, vent plugs (not shown) are fitted.
The flow regulating valve 11 is adjusted so as to supply compressed air at such a rate that is enough for the molding sand 23 to be upwardly conveyed at a low speed with compressed air blown from the squeeze plate 5. The regulating valve lla is adjusted so as to supply compressed air at such a large rate that is enough to generate a high pressure in the molding sand 23 due to the pressure losses in the molding sand 23 and passages 21. The flow regulating valve llb is adjusted so as to supply air at such a rate that is enough to prevent the raised molding sand 23 from dropping.
In the accompanying drawings, a cope molding flask, an upper drag upset frame, and an upper squeeze _ ~ _ ~ ' :, ", , , :: - ~ ' ' 1 plate which are to be mounted on the pattern 17 are omitted to make simple the examination of the present invention.
In an apparatus having the above-described construction, a drag molding flask 16 is moved by the roller conveyors 15 just above a drag upset frame into which a squeeze plate 5 is fitted. Cylinders 2, 2, 3 are then actuated to upwardly move the drag upset frame 1 and the squeeze plate 5 to lift the drag molding flask 16 from the roller conveyors 15 to a small extent and then stop the same. A predetermined amount of molding sand 23 is thereafter fed from a hopper (not shown) into a space defined by the drag upset frame 1, the squeeze plate 5 and the drag molding flask 16, and ].5 subsequently, a pattern 17 is mo~ed to the upper portion of the drag molding flask 16. The cylinders 2, 2, 3 are then actuated to press the drag molding flask 16 against the lower surface of the pattern 17 as shown in Fig. 1.
The valve 10 is opened for a predetermined period of time so as to flow compressed air from the compressed air source onto the molding sand 23 via the conduit 9, the feed bore 8, the chamber 6, and the air flowing bores 7.
The compressed air flow by the above-mentioned operation serves to upwardly move the molding sand 23 at a low speed. The molding sand 23 flows much, especially, into a recess 18 having many narrow passages in its bottom to allow the recesses 18, 19 ~'7~3 1 to be filled with the molding sand 23. The compressed air is then discharged outside via the passages 21 and the chamber 20.
Accordingly, the molding sand 23 strongly impinges upon projections on the pattern 17 so as to be forced into the recesses 18, 19 without being !' solidified so that the density of the molding sand 23 is increased in the recesses 18, 19.
When the valve 10 is then closed while opening the valve lOa for a predetermined period of time, compressed air is flown in the same manner as mentioned above.
This compressed air is of a large capacity to generate a high pressure under the molding sand 23. Therefore, the density of the molding sand 23 which is close to the surface of the pattern 17 is increased much and the sand ls then solidified. (Refer to Fig. 2.) When the valve lOa is closed while holding the second by-pass shut-off valve lOb the piston rod 4 in the cylinder 3 is extended and thereby upwardly move the squeeze plate 5 so that the molding sand 23 as a whole is squeezed. (Refer to Fig. 3.) The dropping of the molding sand 23 is prevented by the opening of the second by-pass shut-off valve lOb. This condition is continued until a squeezing operation by the squeeze plate 5 has started. In the case where there is no possibility of dropping of the molding sand, a second by-pass piping system 14 having the second by-pass shut-off valve lOb and the second by-pass flow regulating . .
:~27~23 1 valve llb, may be omitted.
The purpose of a squeezing operation which is conducted in the above-mentioned manner is to consolidate the molding sand which is not sufficiently consolidated other than such a portion thereof which is highly consolidated with the compressed air along the surface of the pattern 17. This squeezing operation works a little to the molding sand which has been highly consolidated by compressed air.
When the cylinders 2, 2, 3 are backwardly moved to lower the drag upset frame 1 and the squeeze plate 5, the drag molding flask 16 is removed from the pattern 17 to be returned on the roller conveyors 15.
At this time, a drag mold part has been formed in the drag molding flask 16.
This molding flask removing operation can be easily conducted by introducing compressed air onto the molding sand 23 through the passages 21. ~or this purpose, another piping system 14a including a three-way valve lOc is provided between the passages 21 and the second by-pass system 14. The drag upset frame 1 and the squeeze plate 5 are removed from the drag molding flask 16 when they are do~nwardly rnoved to a small extent.
The drag mold part with the molding flask which is returned on the roller conveyors 15 is transferred to a mold combining position without being upside down.
The drag mold part is then joined to an upper mold part ` ~
1 which has been molded on the pattern 17 at the same time (description will be omitted), so as to ~orm a complete mold.
Onto the drag upset frame 1 which a drag mold part with the molding flask has been brought away, a new empty drag molding flask is introduced, and the above-mentioned operation is repeated]y conducted.
In the above embodiment, the drag molding flask 16 is moved onto and removed from the upper surface of the drag upset frame 1 to form a drag mold part.
However, the drag upset frame 1 can be eliminated so that the squeeze plate 5 is directly fitted into the drag molding flask 16. In this case, the mold which has been completed is removed from the molding flask 16.
In the embodiment, the flow rate of the compressed air supplied through the squeeze plate 5 is regulated but the same e~fect can be obtained by regulating the pressure thereof.
Although the shut-off valve lO is closed simultaneously with the first by-pass shut-off valve 10a in the above embodiment, the shut-off valve 10 may be kept opened.
As may be clearly noted from the above description, a method according to the present invention comprises of flowing compressed air at such a rate that is enough for molding sand to be upwardly moved at a low speed from the squeeze plate so as to force the molding sand into deep recesses defined in a pattern; subsequently l flowing a large amount of compressed air to compact and consolidate to a high density the molding sand which is close to a pattern; and thereafter squeezing the molding sand as a whole by the squeeze plate to consolidate the whole of the molding sand. Accordingly, in spite o~ the fact that the deep recesses are provided in the pattern and formed between the pattern and the molding flask, the molding sand can be fully introduced thereinto and is compacted and consolidated to a high density. ~ method according to the present invention has an extremely high effect especially when it is applied to the production of a drag mold part by using a match plate type pattern. In addition, a drag mold part produced can be joined without turning it upside down.
This serves to prevent a mold from being hurt while it is handled.
The present invention is not, of course, limited to the above embodiment; it may be modified in various ways within the scope of the appended claims.
.
Claims (12)
1. A method of producing a drag mold part, comprising the steps of placing molding sand in a space defined by a drag molding flask and a squeeze plate slidably disposed in said drag molding flask, said squeeze plate being provided with a means for blowing compressed air in the upward direction, joining a pattern having a plurality of air discharge bores to the upper end of said drag molding flask in which the molding sand is placed, blowing first compressed air from said blowing means provided in said squeeze plate so as to move the molding sand upwardly toward said pattern, blowing from said blowing means second compressed air at a flow rate or pressure greater than that of said first compressed air so as to increase the density of the molding sand in the vicinity of said pattern, and upwardly moving said squeeze plate to squeeze the molding sand as a whole.
2. A method according to Claim 1, wherein the molding sand is placed in a space defined by said drag molding flask, a drag upset frame disposed below said drag molding flask and said squeeze plate which is fitted in said drag upset frame.
3. A method according to Claim 1 or Claim 2, wherein the method further comprises the step of blowing third compressed air at a flow rate or pressure smaller than that of the second compressed air from said blowing means after the second compressed air has been blown.
4. A method according to Claim 2, wherein said drag molding flask, said drag upset frame and said squeeze plate are assembled in the manner comprising the steps of fitting said squeeze plate in said drag upset frame, bringing said drag molding flask above said drag upset frame, and upwardly moving said drag upset frame so as to hold said drag molding flask thereon.
5. A method according to Claim 4, wherein the molding sand is fed into said drag upset frame before the step of bringing said drag molding flask above said drag upset frame.
6. A method according to Claim 1, further compris-ing the step of blowing compressed air in the downward direction via said air discharge bores provided in said pattern at the removal of said pattern from a drag mold part which has been completed.
7. An apparatus for producing a drag mold part, comprising a vertically movable drag molding flask, a squeeze plate slidably fitted in said drag molding flask, a pattern having a plurality of air discharge bores and arranged to fit in said drag molding flask, means for carrying said pattern above said drag molding flask, means for upwardly moving said drag molding flask to fit the same with said pattern thereon, means, provided in said squeeze plate, for blowing compressed air, and means for selectively feeding to said flowing means compressed air at a different flow rate or pressure, respectively.
8. An apparatus according to Claim 7, wherein said squeeze plate has a chamber therein; said blowing means is provided in the upper surface of said squeeze plate and consists of a plurality of air discharge bores communicated with said chamber; and said blowing means is communicated with said chamber.
9. An apparatus according to Claim 7, wherein said feeding means has a compressed air source, a plurality of piping systems for communicating said compressed air source with said blowing means, each of said piping systems having a shut-off valve and a flow or pressure regulating valve so as to feed air each piping system having different flow rate or pressure from each others.
10. An apparatus according to Claim 7, wherein said squeeze plate is provided with an air-tight seal around the peripheral wall thereof and air-tightly fitted in said drag molding flask.
11. An apparatus according to Claim 7, wherein means for selectively connecting said feeding means to means for allowing compressed air to pass through said air discharge bores in said pattern into said bottom molding flask, thereby to make easier to remove said pattern from said drag mold part which has been completed.
12. An apparatus for producing a drag mold parts comprising a vertically movable drag upset frame, a squeeze plate slidably fitted in said drag upset frame, means for bringing a drag molding flask in a position above said drag upset frame, a pattern having a plurality of air discharge bores and arranged to fit in said drag molding flask, means for transferring said pattern above said drag molding flask which has been brought in the position, means for upwardly moving said drag upset frame with said squeeze plate fitted therein so as to allow said drag molding flask to be placed thereon and to allow said pattern to be placed on said drag molding flask in alignment therewith, means, provided on said squeeze plate, for blowing compressed air onto said pattern, and means for selectively feeding to said blowing means compressed air at a different flow rate or pressure, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56625/79 | 1979-05-08 | ||
| JP5662579A JPS55147462A (en) | 1979-05-08 | 1979-05-08 | Molding method of lower mold and squeeze plate device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127823A true CA1127823A (en) | 1982-07-20 |
Family
ID=13032469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA334,658A Expired CA1127823A (en) | 1979-05-08 | 1979-08-29 | Method of and apparatus for molding a drag mold part |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS55147462A (en) |
| AU (1) | AU514819B2 (en) |
| BR (1) | BR7905523A (en) |
| CA (1) | CA1127823A (en) |
| CH (1) | CH644537A5 (en) |
| DE (1) | DE2933869C2 (en) |
| DK (1) | DK171196B1 (en) |
| FR (1) | FR2455937A1 (en) |
| GB (1) | GB2048142B (en) |
| IT (1) | IT1162654B (en) |
| PH (1) | PH18462A (en) |
| SE (1) | SE438802B (en) |
| ZA (1) | ZA794559B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58500474A (en) * | 1981-04-02 | 1983-03-31 | ベ−エムデ−・バ−ディッシェ・マシ−ネンファブリ−ク・ドゥルラッハ・ゲ−エムベ−ハ− | Pneumatic compression method and equipment for mold sand |
| DE3149172A1 (en) * | 1981-12-11 | 1983-06-30 | Georg Fischer AG, 8201 Schaffhausen | "METHOD FOR PRODUCING MOLDED BODIES USING GAS PRESSURE" |
| CH666426A5 (en) * | 1984-06-25 | 1988-07-29 | Fischer Ag Georg | MOLDING PLANT. |
| CH672270A5 (en) * | 1986-12-17 | 1989-11-15 | Fischer Ag Georg | |
| DE3717558C3 (en) * | 1987-05-25 | 1997-04-03 | Kuenkel Wagner Prozesstechnolo | Process for making sand molds of models |
| DE3836876C2 (en) * | 1988-10-29 | 1994-06-09 | Badische Maschf Gmbh | Method and device for compacting foundry molding material |
| CH682547A5 (en) * | 1990-04-20 | 1993-10-15 | Fischer Ag Georg | Method and apparatus for compressing granular molding materials. |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2798266A (en) * | 1953-08-03 | 1957-07-09 | Fed Foundry Supply Co | Core and mold blowing method and apparatus |
| CH316854A (en) * | 1953-12-29 | 1956-10-31 | Fischer Ag Georg | Sand blow molding machine |
| FR1355868A (en) * | 1962-03-23 | 1964-03-20 | Device in the form of a machine or machine head, for obtaining foundry molds and cores and other parts molded into a molding mass, by use of compressed air, in particular with projection of sand | |
| US3293703A (en) * | 1962-11-13 | 1966-12-27 | Arthur R Taccone | Vacuum molding apparatus |
| US3688830A (en) * | 1969-08-28 | 1972-09-05 | Elizabeth F Thompson | Method of making molds |
| IT1008749B (en) * | 1973-01-29 | 1976-11-30 | Buehler Eugen | PROCEDURE AND DEVICE FOR THE PREPARATION OF SHAPES IN EARTH SAND |
| DE2361820C3 (en) * | 1973-01-29 | 1975-07-03 | Eugen Dipl.-Ing. 8871 Burtenbach Buehler | Method and device for the further transport of a molding strand formed from horizontally divided boxless casting molds along a casting and cooling section |
| FR2242177A1 (en) * | 1973-08-31 | 1975-03-28 | Figueras Michel | Sand moulds and cores mfr using the cold-box process - with initial injection of air into shooter chamber before main shot |
| DE7602966U1 (en) * | 1976-02-03 | 1976-06-24 | Badische Maschinenfabrik Gmbh, 7500 Karlsruhe | FOUNDRY MOLDING MACHINE FOR BOX MOLDS |
| DE2727297C3 (en) * | 1976-06-25 | 1980-07-10 | Georg Fischer Ag, Schaffhausen (Schweiz) | Method and device for producing foundry sand molds |
-
1979
- 1979-05-08 JP JP5662579A patent/JPS55147462A/en active Pending
- 1979-08-17 AU AU50045/79A patent/AU514819B2/en not_active Ceased
- 1979-08-21 DE DE2933869A patent/DE2933869C2/en not_active Expired
- 1979-08-24 CH CH771079A patent/CH644537A5/en not_active IP Right Cessation
- 1979-08-28 PH PH22971A patent/PH18462A/en unknown
- 1979-08-28 BR BR7905523A patent/BR7905523A/en not_active IP Right Cessation
- 1979-08-28 SE SE7907154A patent/SE438802B/en not_active IP Right Cessation
- 1979-08-29 DK DK360679A patent/DK171196B1/en not_active IP Right Cessation
- 1979-08-29 CA CA334,658A patent/CA1127823A/en not_active Expired
- 1979-08-29 ZA ZA00794559A patent/ZA794559B/en unknown
- 1979-08-29 IT IT50120/79A patent/IT1162654B/en active
- 1979-08-29 FR FR7921661A patent/FR2455937A1/en active Granted
- 1979-08-30 GB GB7929995A patent/GB2048142B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2048142A (en) | 1980-12-10 |
| DE2933869C2 (en) | 1986-02-27 |
| ZA794559B (en) | 1980-08-27 |
| AU5004579A (en) | 1980-11-13 |
| SE438802B (en) | 1985-05-13 |
| DE2933869A1 (en) | 1980-11-13 |
| SE7907154L (en) | 1980-11-09 |
| DK171196B1 (en) | 1996-07-22 |
| AU514819B2 (en) | 1981-02-26 |
| DK360679A (en) | 1980-11-09 |
| JPS55147462A (en) | 1980-11-17 |
| BR7905523A (en) | 1981-03-04 |
| CH644537A5 (en) | 1984-08-15 |
| PH18462A (en) | 1985-07-18 |
| IT7950120A0 (en) | 1979-08-29 |
| GB2048142B (en) | 1983-05-25 |
| FR2455937A1 (en) | 1980-12-05 |
| FR2455937B1 (en) | 1984-01-13 |
| IT1162654B (en) | 1987-04-01 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |