US3552477A - Method of making foundry moulds - Google Patents

Method of making foundry moulds Download PDF

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Publication number
US3552477A
US3552477A US664730A US3552477DA US3552477A US 3552477 A US3552477 A US 3552477A US 664730 A US664730 A US 664730A US 3552477D A US3552477D A US 3552477DA US 3552477 A US3552477 A US 3552477A
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United States
Prior art keywords
plate
stripper plate
pattern
patterns
pressing
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Expired - Lifetime
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US664730A
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English (en)
Inventor
Benedikt Veniaminov Rabinovich
Fedor Filippovich Rezinskikh
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only
    • B22C15/12—Compacting by jarring devices only involving mechanical gearings

Definitions

  • a method for making foundry moulds which comprises pressing moulding sand in a flask between a thrust plate and a pattern plate with patterns therein, and pressing the moulding sand also by a stripper plate.
  • the pattern plate and stripper plate are moved independently of each other along a portion of a complete pressing stroke and at the end of the pressing stroke both plates are moved simultaneously to complete the motion. Thereupon the patterns are slightly withdrawn from the thusly compacted mould by the stripper plate whereafter all of the components are returned to the initial position.
  • FIG. 3 is a sectional view of the device for making foundry moulds when utilizing the upper sand frame, shown in the inimoulds, and more particularly to methods ofinaking foundry moulds by pressing and to devices for effecting same.
  • the degree of compaction of the moulding sand, disposed above the portions of patterns of different heights, is adjusted by varying the v depth of the' cavitiesin the shaped thrust plate or by providing projections thereon In those cases; however, where narrow spaces were present between the'adjacentpatterns, while the patterns had cavities,
  • An object of the present invention is toprovide a method of making foundry moulds by pressing in which the friction of the moulding mixture against the pattern'walls does not interfere v with the compaction. of a mould; rather it contributes to the compression thereof, which results in the provision of the required compaction of the-moulding sand in narrow spaces "between patterns and in cavities of the pattern itself.
  • FIG. 4 is a sectional view of the device, as is illustrated in FIG. 3,'shown on completing the pressing operation;
  • FIG. 5 is an enlarged sectional view of the device complete with an-arrangement for compacting the projecting portions of a mould or cods, shown in the initial position;
  • FIG. 6 is an enlarged sectional view of the device complete with an arrangement, similar to that shown in FIG. 5, with the layout of parts ensuring the formation of an additional layer of the moulding sand for the subsequent pressing of the cod;
  • FIG. 7 is an enlarged sectional view of the device complete with an arrangement similar to that illustrated in FIGS. 5 and 6, but shown on completing the operation of pressing.
  • the device (FIGS. 1 to 7) comprises a stripper plate I; a piston 2; a pattern plate 3; patterns 4; a piston 5; power cylinders 6, whose rods are provided with stops adjustable in the vertical direction; a frame 7 of the moulding machine; a flask 8; a shaped thrust plate 9; a crosspiece 10 of the moulding machine; vertically adjustable stops '11; a cylinder 12; an upper sand frame 13; a movable insertion piece 14-, a spring 15, and a vertically adjustable stop 16.
  • the parts 2, 5 and 12 are shown in the drawings but partially (FIGS. 1 to 4), as representing the existing devices, in which the part 2 functions as a piston in relation to the cylinder 12, and is simultaneously employed as a cylinder for the piston 5.
  • the pistons 2 and 5 may be disposed independently from each other.
  • a device having the frame of a moulding machine with a movable pattern plate with patterns arranged inside thereof, in which, according to the invention, a movable stripper plate is provided betweenthe moulding machine frame and pattern plate, coupled witha pressing piston and supporting power cylinders, whose rods support the pattern plate coupled with another pressing cylinder.
  • FIG. I is a sectional view of the device in its initial position for making foundry moulds when utilizing'the bottom sand frame; 7
  • FIG. 2 is a sectional view of the same device, illustrated in FIG. 1, shown on completing the pressing operation;
  • the moulding sand is brought into contact with the shaped thrust plate 9, attached to the crosspiece 10 of the moulding machine, and is fixed in this position.
  • the shaped thrust late 9 is provided with cavities varying in height.
  • the pressing of the moulding sand is started by the motion of the piston 5, which is employed for moving the pattern plate 3 with the patterns 4 through a distance A (not shown in the drawings), smaller than the complete stroke A, by a certain value B (not shown on the drawings), whereupon the piston together with the pattern plate and patterns is stopped.
  • the piston 2 with the stripper plate 1 is started to be moved. Their complete stroke is equal to A,,.
  • the stripper plate 1 reaches the pattern plate 1, upon which, on its way, the stripper plate 3 with the help of rods of the cylinder 6, engages the pattern plate 3 (together with the piston 5) and moves them together through a distance 8 until stops 11 thrust against the'fl'ame 7 of the moulding machine.
  • the entire moulding assembly is stopped precisely in the plane of the frame 7 and in the joint of the flask 8 (FIGS. 2).
  • EXAMPLE 2 The initial and final position of components of the device are the same as those shown in the first example (FIGS. 1 and 2).
  • the second example differs in that the pattern plate and stripper plate are simultaneously started to be moved, but the former is moved at a faster speed than the latter. After the pattern plate has been moved through a distance A, it is stopped; then it is engaged by the stripper plate, further the moulding process goes on as set forth in the first example.
  • the method represented by the second example allows a reduction in the compacting time and an increase in the productivity as compared with the method of the first example.
  • the moulding sand found in the narrow spaces between the patterns will be compacted to a smaller degree.
  • the working routine, as described in the second example is recommended with a comparatively free disposition of the patterns.
  • EXAMPLE 3 In those cases when the pattern is of a constant height h," the shaped thrust plate 9 may be replaced by a flat thrust plate.
  • the stripper plate In the initial position, the stripper plate is lowered below the frame plane by a value A,,, as in the first example (FIG. 1), whereas the joint of the patterns is raised above the stripper plate by a value (A -A).
  • a -A The compression of the moulding sand is started by the mutual motion of the stripper plate and pattern plate.
  • each rod is elevated until it thrusts against the cylinder cover.
  • a flask 8 with a sand frame 13 having a height H equal to A i.e.. to the full stroke of the pistons 2 and 5, as well as to that of the pattern plate 3 and stripper plate 1), are put on the stripper plate 1 and filled with the moulding sand.
  • the shaped thrust plate 9, secured on the crosspiece 10 of the moulding machine, is placed above the flask with the sand frame and pressed against the surface of the moulding sand.
  • the shaped thrust plate 9 has cavities varying in height.
  • the pressing of the moulding sand is started by the motion of the piston 5, by means of which the pattern plate 3 with the patterns 4 is displaced through a distance A (not shown in the drawings smaller than the complete stroke A,, by a certain value B (not shown in the drawings), whereupon the piston together with the pattern plate and patterns are brought to a halt.
  • the rods of the cylinders 6 are lowered, and under the action of the piston 5, the patterns 4 are withdrawn to some degree through the stationary stripper plate 1, which is thereby supporting the mould.
  • the crosspiece 10 with the shaped thrust plate 9 are as usually lifted and brought aside, while the frame 13 and flask 8 are removed. Then the pistons 2 and 5 are lowered, and the whole moulding assembly is brought to its initial position.
  • H 250 mm.
  • li l mm.
  • A l00 mm.
  • B 75 mm.
  • the subsequent displacement of the insertion piece in relation to the pattern is determined by a size A which may be smaller or greater than the height of the cod.
  • a size A which may be smaller or greater than the height of the cod.
  • the insertion piece 14 is engaged by its stop 16 and is displaced by the value ol'the strike A followed by the compaction of the cod.
  • the positioning of the components of the device is shown in FIG. 7.
  • the insertion piece I4 together with the stripper plate are left stationary in order to support the cod.
  • EXAMPLE 6 In contradistinction to the fifth exemplary embodiment, in the initial position the pattern 4 islifted above the plane of the stripper plate 1 by a value A, (FIG. 6), owing to which an additional layer of the moulding sand (for the subsequent compaction of the cod) is formed at the stage of filling the flask with the moulding sand.
  • Such a technique is likely to improve the conditions of filling the pattern cavity by the moulding sand.
  • the technique described herein is recommended for cases where the cavity in the pattern is comparatively narrow, while the spaces between the patterns and flask walls, as well as between the patterns proper are sufficiently large.
  • a method of making foundry moulds comprising pressing molding sand in' a'flaskbetweena thrust plate'and a pattern plate with patterns therein; pressing said molding sand also by a stripper plate, saidpattern plate and stripper plate being moved independently of each otheralong a portion of a complete pressing stroke, and, at the end of the pressing stroke, moving both plates in such a manner that they db not move relative to each other an complete the motion simultaneously; and thereupon withdrawing the patterns slightly from the thusly compacted mold through said stripper plate, which supports the moulding sand, whereupon all the components of the device are brought back to initial position, said thrust plate being shaped, the motionof said pattern plate and stripper plate being started simultaneously; said pattern plate being initially moved at a greater speed than said stripper plate and after moving them in such manner along a portion of the complete pressing stroke said pattern plate is stopped, and said stripper plate is continued to be moved in the same direction until said stripper plate engages said pattern plate for effecting their common motion in
  • a method of making foundry molds comprising pressing molding sand in a flask between a thrust plate and a pattern plate with patterns therein; pressing said molding sand also by from the thusly compacted mold through said stripper plate, which supports the molding sand, whereupon all the components of the device are brought back to initial position, said thrust plate being flat, said pattern plate and patterns being lifted into an initial position above the. plane of said stripper plate, the pattern plate together with said stripper plate being first moved along a greater portion of the complete pressing stroke required for compacting the molding sand layer above the patterns; said pattern plate then being stopped while said stripper plate continues to move in the same direction such that said stripper plate engages said pattern plate for effecting their common motion in the last stage of the pressing operation.
  • a method of making foundry molds comprising pressing molding sand in a flask between a thrust plate and a pattern plate with patterns therein; pressing said molding sand also by a stripper plate, said pattern plate and stripper plate being moved independently of each other along a portion of a complete pressing stroke, and, at the 'end of the pressing stroke, moving both plates in such a manner that they do not move relative to each other and complete the motion simultaneously; and thereupon withdrawing the pattern sllghtly from the thusly compacted mold through said stripper plate,
  • said mold which supports the molding sand, whereupon all the components of the device are brought back to initial position, said mold having cods disposed inside of the patterns and for their compacting by said stripper plate an insertion piece is displaceably inserted in the patterns to form end faces for the cods, moving said insertion piece and'patterns relative to one another during one of the molding stages such that the cavity in the mold is deepened as compared with the height of said cod in the finished mold; filling the cavity thus obtained with molding sand, whereupon, the stripper plate, during the independent motion thereof, moves said insertion piece in relation to the associated pattern, and the respective cod is compacted until its final dimension is obtained; whereafter during the subof the cavity, forming the cod, and filling of the cavity thus oba stripper plate, said pattern plate-and stripper plate being tained by the molding sand in the course of the pattern motion, and along a portion of the stroke whereof said insertion piece is left stationary.
  • a method according to claim 3 comprising effecting the relative displacement of said insertion piece and pattern, deepening of the cavity, and forming the cod in the initial position due to the lifting of the pattern over the plane of said stripper plate, while the cavity thus obtained is filled with the molding sand simultaneously with its being supplied into the flask.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US664730A 1967-06-07 1967-08-31 Method of making foundry moulds Expired - Lifetime US3552477A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DEN0030660 1967-06-07
BE702937 1967-08-22
FR118652 1967-08-22
US66473067A 1967-08-31 1967-08-31
GB40543/67A GB1179865A (en) 1967-06-07 1967-09-05 A Method Of, and Means For, Making Foundry Moulds

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US3552477A true US3552477A (en) 1971-01-05

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US664730A Expired - Lifetime US3552477A (en) 1967-06-07 1967-08-31 Method of making foundry moulds

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US (1) US3552477A (en。)
BE (1) BE702937A (en。)
DE (1) DE1558133A1 (en。)
FR (1) FR1584455A (en。)
GB (1) GB1179865A (en。)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091858A (en) * 1974-11-12 1978-05-30 Grigory Mikhailovich Goldring Apparatus for making molds by sequential squeezing
ES2217938A1 (es) * 2002-09-18 2004-11-01 Abilio Caetano Blasco Accesorio para eliminar determinadas contrasalidas en los utillajes de fundicion.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1006449A (en) * 1911-04-27 1911-10-17 William Millen Duncan Sand-molding apparatus.
US1966941A (en) * 1931-08-31 1934-07-17 Bunting Brass & Bronze Co Molding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1006449A (en) * 1911-04-27 1911-10-17 William Millen Duncan Sand-molding apparatus.
US1966941A (en) * 1931-08-31 1934-07-17 Bunting Brass & Bronze Co Molding machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091858A (en) * 1974-11-12 1978-05-30 Grigory Mikhailovich Goldring Apparatus for making molds by sequential squeezing
ES2217938A1 (es) * 2002-09-18 2004-11-01 Abilio Caetano Blasco Accesorio para eliminar determinadas contrasalidas en los utillajes de fundicion.
ES2217938B1 (es) * 2002-09-18 2006-02-16 Abilio Caetano Blasco Accesorio para eliminar determinadas contrasalidas en los utillajes de fundicion.

Also Published As

Publication number Publication date
BE702937A (en。) 1968-02-22
FR1584455A (en。) 1969-12-26
DE1558133A1 (de) 1970-03-19
GB1179865A (en) 1970-02-04

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