US3623539A - Impact sand molding machine - Google Patents

Impact sand molding machine Download PDF

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Publication number
US3623539A
US3623539A US799423A US3623539DA US3623539A US 3623539 A US3623539 A US 3623539A US 799423 A US799423 A US 799423A US 3623539D A US3623539D A US 3623539DA US 3623539 A US3623539 A US 3623539A
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US
United States
Prior art keywords
sand
piston
molding
head
recocking
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
US799423A
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English (en)
Inventor
Russell W Taccone
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.)
Bangor Punta Operations Inc
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Bangor Punta Operations Inc
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Filing date
Publication date
Application filed by Bangor Punta Operations Inc filed Critical Bangor Punta Operations Inc
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Publication of US3623539A publication Critical patent/US3623539A/en
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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
    • 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

  • Walsh ABSTRACT The present disclosure is directed to a machine for making green sand molds by an impact mechanism which imparts an impact from an impact head driven by the explosive force of suddenly released compressed air in such a way that the molding head strikes the sand and imparts its kinetic energy by way of an impulse to the sand, thereby packing the sand around the patterns It has been discovered that by using the impulse principle in molding, the sand is uniformly packed and uniform mold hardness results PATENTEnunv 30 I97! SHEET 1 BF 2 HJVIL/JTUR.
  • This invention relates to green sand molding and more particularly to making green sand molds impacting a molding head on a body of loose molding sand.
  • Hydraulic units are often complicated and expensive and are subject not only to a bad Pressure applied to molding sand is transmitted most in the direction of the applied force, except in the initial moment of contact when the flowability of the sand is at its absolute maximum and transmits the most pressure in all directions. In this instant the sand must flow with the pressure, resulting in almost perfect uniformity of density and hardness. If the pressure applied is very small the internal friction of the sand grains on each other and the forces of inertia will quickly dissipate it. However, if the force is great enough, the pressure is transmitted to all extremities equal amounts.
  • Hi-Impact molding
  • It consists of two large diameter pistons connected by a center ram to a compensating head which is all supported above the flask which has already been filled with sand. Compressed air accelerates this assembly downward to the point of impact with the sand.
  • This high-production unit is adaptable to all types of pattern equipment, and standard flasks of any reasonable depth can be used with bars in almost any arrangement. No special foundation is required, the machine can be installed on floor level, above ground, or supported on I-beams above a conveyor pit.
  • the molding machine has many technical advantages: Some of these are as follows:
  • This versatile machine has successfully overcome most obstacles to high production-high pressure molding.
  • Another object of the invention is to provide an impact machine for forming green sand molds.
  • Another object of the invention is to provide an impact-type molding machine in combination with a double-acting piston arrangement for operating the molding head to provide the impact.
  • FIG. I is a longitudinal cross-sectional view of the molding machine according to the invention.
  • FIG. 2 is a view similar to FIG. 1 showing the flask-carrying car moved out from the under the molding head into a filling position.
  • FIG. 3 is a view similar to FIG. 2 of another embodiment of the machine.
  • FIG. 4 is a view similar the machine.
  • FIG. 5 is a longitudinal cross-sectional view of another embodiment of the molding head.
  • FIG. 6 is a partial view of a flask supported over a molding car in stripped position.
  • FIG. 7 is a view ofa part of the machine shown in FIG. 3.
  • the machine as shown in FIGS. 1 and 2, has a base 10, which supports a track 11.
  • a car 12 is supported on the track, and it rolls from a position under the head 16 to a position under the hopper 49 on wheels 24.
  • the cushion 31 is supported at one end of the track, and cushion 32 is at the other end, so that the car will be decelerated to a stop when it comes into engagement with the cushions.
  • the flask I3 is supported on the car, and it may be filled with sand 14 from hopper 49 in the conventional manner.
  • FIG. 1 of another embodiment of the cushion 32.
  • the flask is supported on pattern plate 15 that has the patterns shown.
  • the compensating head 16 has feet or shoes 17 supported in small cylinders 18 attached to the head.
  • the head 16 is in turn attached to the center ram, which is fixed to the recocking piston and to the ram piston 22. These pistons are fixed together and move as a unit, and the recocking piston 20 slides in recocking cylinder 19, while the ram piston 22 slides in ram cylinder 23.
  • the cylinder head 28 is clamped between cylinder 19 and cylinder 23.
  • An air supply is connected to inlet 36, and this air is directed by the valve arrangement shown through valves 29 and 30, as the case may be, to the respective cylinders and pistons.
  • the cylinder head is connected to the air line 29, and the cylinder head 52 is connected to the air line 30.
  • a source of air at a pressure between 40 to 60 p.s.i. is available at air line 55.
  • the flow of air is controlled by a valve 38 having an actuating handle 39.
  • handle 39 By moving handle 39 the pressurized air available in line 55 can be directed as desired to line 41 in which case the ram impacts the sand or to line 40 in which case the ram is raised above the surface of the sand.
  • valve spools 37 and 54 are shown in position to drive head 16 downward to form a mold in flask 15.
  • the handle 39 is moved to connect air from source 55 to the line 41. This will shift the valve spool 37 to the position shown to connect the air supply line 36 to the line 29, and thence to the space 26 above the ram piston 22. Air will flow from this space 26 through the port 56 to the space 57 above the recocking piston.
  • This force on top of the recocking piston 20 will act in series with the force on piston 22 and will aid in driving the head 16 downward to impact on the sand in the flask.
  • valve spool 54 will be in the position shown in FIG. 1. Air from the inlet 36 will be shut off by spool 54 and pipe will be connected through the valve spool 54 to the outlet so that there is no pressure in space 58 below the recocking piston 20.
  • the machine is supported on a base 110, and the molding car 112 is supported by means of wheels I24 on the tracks shown.
  • the car moves from one side from a position under the ram head I16 to a position under loading hopper 144 and into engagement with the cushions I31 and 132, which bring the car to a smooth stop.
  • the molding head 116 is supported on the ram 153, which is in turn supported on the recocking piston 120.
  • An air supply will be connected by a suitable valving arrangement similar to that shown in Fig. l to the pipes 129 and pipes 130.
  • the upward movement of the ram will be cushioned by cushioning members 151, which are similar to cushioning members SI in the embodiment of the invention shown in FIG. I.
  • the car will be moved from side to side by means of the car cylinder 33, which has a piston 133, which has piston rods shown which are similar to the car moving rods 33 in the embodiment of FIG. 1.
  • the head may be held up in cocked position by means of a brake mechanism, which is in the form of an inflatable collar and is supplied air from line 162 to cause the collar to grip the shaft [M and thereby hold the head up in position.
  • a brake mechanism which is in the form of an inflatable collar and is supplied air from line 162 to cause the collar to grip the shaft [M and thereby hold the head up in position.
  • the shaft 162 has a groove 163, which will receive the detents 164 on the other ends of the piston rods of pistons I65.
  • FIG. 5 shows an embodiment of a ram having a flat plate 262, which engages the sand. This ram is driven up an down by air in space 126.
  • a molding machine comprising a base to support a flask adapted to contain sand
  • a molding head having a compensating head attached thereto adapted to be disposed in spaced relation to said sand
  • said compensating head having a plurality of sand engaging feet fixed thereto whereby the force of said impact of said head on said sand is distributed uniformly throughout said sand,
  • a molding piston and a recocking piston mounted on a common piston rod and being slidably supported in said cylinder and connected to said molding head to drive said molding head into engagement with said sand whereby an impact results on said sand sufficient to pack said sand around said pattern to form a sand mold
  • a compressed air source valve means connected to said cylinder above said molding piston and above said recocking piston driving said head into engagement with said sand
  • valve means for exhausting air from above said molding piston and above said recocking piston and admitting air below said recocking piston to move said head to recocked position
  • brake means disposed on said machine adapted to engage said piston rod extension to hold said piston rod in recocked position.
  • a molding machine comprising a base to support a flask adapted to contain sand,
  • a molding head having a compensating head attached thereto adapted to be disposed in spaced relation to said sand
  • said compensating head having a plurality of sand engaging feet fixed thereto whereby the force of said impact of said head on said sand is distributed throughout said sand,
  • a molding piston and recocking piston mounted on a common piston rod and being slidably supported in said cylinder and connected to said molding head to drive said feet into engagement with said sand whereby an impact results on said sand sufficient to pack said sand around said pattern to form a sand mold
  • said car is disposed on a track, a sand hopper spaced from said molding head, means to move said car from a position under said molding head to a position under a sand hopper.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
US799423A 1969-02-14 1969-02-14 Impact sand molding machine Expired - Lifetime US3623539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79942369A 1969-02-14 1969-02-14

Publications (1)

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US3623539A true US3623539A (en) 1971-11-30

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Application Number Title Priority Date Filing Date
US799423A Expired - Lifetime US3623539A (en) 1969-02-14 1969-02-14 Impact sand molding machine

Country Status (5)

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US (1) US3623539A (enExample)
JP (1) JPS4927485B1 (enExample)
CA (1) CA929318A (enExample)
DE (1) DE2006023A1 (enExample)
GB (1) GB1296089A (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838371A1 (de) * 1988-11-11 1990-05-17 Hench Automatik App Masch Messzelle zur spektralanalyse von stroemenden medien, insbesondere kunststoffschmelzen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111730A (en) * 1960-09-27 1963-11-26 Malcus Holmquist Ab Combined squeezing and jolting devices for inverting moulding machines
US3233291A (en) * 1960-09-26 1966-02-08 Osborn Mfg Co Explosive force molding machine and method
US3381740A (en) * 1965-07-07 1968-05-07 Osborn Mfg Co Foundry molding machine
US3386493A (en) * 1965-07-07 1968-06-04 Osborn Mfg Co Mechanical lock means for foundry molding machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233291A (en) * 1960-09-26 1966-02-08 Osborn Mfg Co Explosive force molding machine and method
US3111730A (en) * 1960-09-27 1963-11-26 Malcus Holmquist Ab Combined squeezing and jolting devices for inverting moulding machines
US3381740A (en) * 1965-07-07 1968-05-07 Osborn Mfg Co Foundry molding machine
US3386493A (en) * 1965-07-07 1968-06-04 Osborn Mfg Co Mechanical lock means for foundry molding machine

Also Published As

Publication number Publication date
JPS4927485B1 (enExample) 1974-07-18
CA929318A (en) 1973-07-03
DE2006023A1 (de) 1970-08-20
GB1296089A (enExample) 1972-11-15

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