US3590906A - Cold-box resin-bonded foundry core-making machine - Google Patents

Cold-box resin-bonded foundry core-making machine Download PDF

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Publication number
US3590906A
US3590906A US798032A US3590906DA US3590906A US 3590906 A US3590906 A US 3590906A US 798032 A US798032 A US 798032A US 3590906D A US3590906D A US 3590906DA US 3590906 A US3590906 A US 3590906A
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United States
Prior art keywords
controlled
cold
timer
final
sand
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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
US798032A
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English (en)
Inventor
Derek Randolph Bayliss
Terence Hugh Middleton
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.)
Hexion UK Ltd
Meakers Realisations Ltd
Original Assignee
Borden Chemical UK Ltd
Meakers Realisations Ltd
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Publication of US3590906A publication Critical patent/US3590906A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
    • B22C5/0463—Plants
    • B22C5/0468—Plants having feeding moulds, e.g. using gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles

Definitions

  • COLIHKX RESlN B0NDED FOUNDRY CORE ABSTRACT An apparatus for performing the method of producing resin-bonded foundry cores by the cold-box MAKING MACHINE technique which involves delivering two segregated mixes, of
  • the general foundry practice for manufacturing accurate and repetitively consistent cores is, basically, to use phenolic or other thermosetting resins which, in the presence of an acid catalyst, are mixed in the correct proportions with the particular grade or grades of sand which may be required. There is little or no reaction between the resin and the catalyst (within the time required to mix them thoroughly) until heat is applied to the mix, the resin then becoming cross-linked and setting into a consolidated shape.
  • the cold-box technique enables the thickness of the sections of a corebox to be reduced by over 50 percent as compared with what obtains in the case of a system that requires the application of external heating; and, in addition, the materials used in the manufacture of the coreboxes are much cheaper, owing to the absence of thermal cycling and distortion due to thermal gradients within the box.
  • a method of producing such cores by employing the cold-box technique comprises mixing (in the requisite proportions) controlled amounts of sand and resin on the one hand, and of sand and hardener on the other hand; delivering the two segregated mixes into a mixing device to produce a homogeneousfinal mixture of all the materials; dispensing the final mixture into a blowing chamber; obturating communication between the mixing device and the blowing chamber, and then applying an airblast to that chamber to blow the final mixture into a mold cavity in a corebox.
  • the core-making process although it is continuous, is constituted by a sequence of discrete phases of operation, and the requisite quantities of the core-making materials are accurately metered so that, at each stage, there is no excess material in the system.
  • each of the operating phases is arranged to be interlocked with the others by time controlled mechanism.
  • a core-making machine designed to operate in accordance with the invention comprises, in combination, a hopper containing sand of which the temperature and moisture content are controlled (to ensure substantially constant, and therefore repetitively consistent, operating conditions), the sand hopper having two timer-controlled outlet valves; two separate mixing devices to which controlled amounts of sand are delivered form the respective hopper outlets; means for supplying resin to one of the mixing devices; means for supplying hardener to the other mixing device; two separate hoppers into which the segregated mixes are delivered; a final mixer for producing a homogeneous mixture of all the materials; timer-controlled outlet valve means by which the respective mixes are delivered to the final mixer; a blowing chamber serving a cold corebox; timer-controlled valve means for dispensing the final mix into the blowing chamber; and a timer-controlled valve effective to obturate communication between the final mixer and the blowing chamber before the final mixture is blown into the corebox.
  • FIG. 1 shows a schematic view of the machine in isometric projection
  • FIG. 2 is a perspective view of an assembly, comprising a pair of hoppers and associated slide valve means, which forms part of the machine shown in FIG. 1;
  • FIG. 3 is a perspective view showing how the final mixer of the machine is mounted
  • FIG. 4 is a broken perspective view showing a slide-valve that controls the outlet ofthe final mixer.
  • FIG. 5 is a fragmentary perspective view showing a slidevalve that controls communication between the final mixer and a blowing chamber.
  • a hopper 1 (FIG. 1) contains sand of which the temperature and moisture content and controlled (to ensures substantially constant, and therefore repetitively consistent, operating conditions).
  • the base of the sand hopper l is fitted with two timer-controlled outlet valves 2 of the slidable-plate type, each valve controlling its own discharge outlet 3 which, conveniently, may be a circular hole in the base of the hopper.
  • the controlling edge of each slidable valve 2 incorporates a V shaped notch 4 which affords a variable area aperture as it is moved across the corresponding outlet 3. In this way the rate of discharge of the sand can be regulated in dependence upon the size of the particular core which is to be mode at any time.
  • Two mixing devices 5 and 6 of the continuous screw type are disposed side by side, with their respective inlets 7 in registration with the discharge outlets 3 of the sand hopper l.
  • Resin from a tank 8 is delivered by a pump 9 an pipe 10 to the mixing device 5; and hardener from a tank 11 is delivered by a pump 12 and pipe 13 to the mixing device 6.
  • two segregated mixes are produced; namely, resin/ sand and hardener/sand respectively.
  • the resin tank 8 and the hardener tank 11 have their temperature and moisture content controlled, to ensure substantially constant metering.
  • the resin pump 9 and the hardener pump 12 are of variable output; so that exact metering to suit any volume of sand can be achieved.
  • Each of these hoppers has a bottom outlet controlled by a timer-controlled valve 19, of the slidable plate type, which works in guides 20 and 20A; the guides 20 being fixed to the respective halves ofa girderlike support frame 21, which is mounted on pillars 22.
  • the hoppers 17 and 18 (see HO. 2) are each supported by an attached strap 23 bolted to the corresponding guide 20; and the central guide 20A is bolted to a pair of angle brackets 24 attached to each of the hoppers 17 and 18.
  • the respective slidevalves 19 are rigidly interconnected by a transverse bar 25 which is secured to a piston rod 26 of a pneumatic cylinder (not shown).
  • a final mixer 27 of the paddle type having a driving shaft 28 supported by the guide 20A and accommodated in a gap between the hoppers l7 and 18, is mounted so that it lies beneath these hoppers in position to receive their discharges when the intervening control valve 19 is opened.
  • the final mixer 27 is accommodated in a gap between the two halves of the frame 21 and, as shown in FIG. 3, is mounted by four brackets 29 secured to the frame 21.
  • paddle-type mixers are well known, it has not been deemed necessary to illustrate the actual stirring paddles mounted on the driving shaft 28.
  • the final mixer 27 is supported so that its open bottom lies immediately above a timer-controlled slide-valve 30 (FIG. 4) which, for the sake of clarity in the drawing, has not been shown in FIG. 1.
  • the slide-valve 30 works in guides 31 fixed to a girderlike support frame 32 mounted on the pillars 22. it has an aperture 33, through which the contents of the final mixer 27 can be discharged, and (like the valve 19) is operated pneumatically.
  • the webs of the girderlike frame 32 each have a V-shaped notch 34, in order to cradle a conical funnel 35 beneath the slide-valve 30.
  • FIG. 5 There is a further timer-controlled slide-valve 36 (FIG. 5), which has not been shown in the schematic view (FIG. ll). It works in guides 37 fixed to the underside of the girderlike support frame 32, and is operated by a piston rod 38 of a pneumatic cylinder (not shown).
  • the valve 36 which has an aperture 3? that can be brought into registration with the outlet of the conical funnel 35, serves to obturate communication between the final mixer 27 and a blowing chamber 40 (FIG. 1) before the final mixture is blown into a cold corebox 41.
  • the latter can be located on a table 42 which is movable up and down to effect clamping and release of the corebox 41; or the table can remain stationary and the blowing chamber 40 can be movable up and down instead.
  • a table 42 which is movable up and down to effect clamping and release of the corebox 41; or the table can remain stationary and the blowing chamber 40 can be movable up and down instead.
  • the final mixer 27 is fitted with airblast jets which, at the appropriate stage of the operating cycle of the machine, are automatically turned on in order to clean the final mixer.
  • airblast jets which, at the appropriate stage of the operating cycle of the machine, are automatically turned on in order to clean the final mixer.
  • One of these jets is indicated at 43 (FIG. 1) on the central guide 20A.
  • the corebox 41 is clamped.
  • the two screw-type mixers S and 6 are started and run for a set period of time, depending upon the actual chemical system involved.
  • the resin and hardener pumps 9 and 12 are started and run for a set period of time, depending upon the actual chemical system involved.
  • valve 19 between the two hoppers 17 and 18 and the final mixer 27 is opened and then closed again.
  • the sand hopper outlet valves 2 are opened, and are closed again when the resin and hardener pumps 9 and 12 and the screw-type mixers 5 and 6 are stopped.
  • the airblast of the blowing chamber 40 is turned on for approximately 2 seconds.
  • the final stage of the operating cycle is that the core is allowed to harden sufficiently for it to be removed from the corebox.
  • a cold-box core-making machine for producing resinbonded foundry cores, comprising, in combination, a hopper containing sand of which the temperature and moisture content are controlled, the sand hopper having two timer-controlled outlet valves; two separate mixing devices to which controlled amounts of sand can be delivered from the respective hopper outlets; means for supplying resin to one of the mixing devices; means for supplying hardener to the other mixing device; two separate hoppers into which the segregated mixes are delivered; a final mixer for producing a homogeneous mixture of all the materials; timer-controlled outlet valve means by which the respective mixes are delivered to the final mixer; a blowing chamber in communication with the final mixer and serving a cold corebox; timer-controlled valve means for dispensing the final mix into the blowing chamber; and a timer-controlled valve effective to obturate communication between the final mixer and the blowing chamber before the final mixture is blown into the corebox.
  • a cold-box core-making machine in which the outlet valves of the sand hopper are of the slidableplate type, and the controlling edge of each of these valves incorporates a V-shaped notch which affords a variable area aperture as it is moved across the corresponding outlet.
  • a cold-box core-making machine in which the timer-controlled outlet valve means by which the respective mixes are delivered to the final mixer comprises a pair of rigidly interconnected slide-valves each controlling a bottom outlet of the corresponding one of the two separate hoppers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Accessories For Mixers (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US798032A 1968-02-16 1969-02-10 Cold-box resin-bonded foundry core-making machine Expired - Lifetime US3590906A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7592/68A GB1200507A (en) 1968-02-16 1968-02-16 Production of foundry cores
FR6906365A FR2025275A5 (enrdf_load_stackoverflow) 1968-02-16 1969-03-07

Publications (1)

Publication Number Publication Date
US3590906A true US3590906A (en) 1971-07-06

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Application Number Title Priority Date Filing Date
US798032A Expired - Lifetime US3590906A (en) 1968-02-16 1969-02-10 Cold-box resin-bonded foundry core-making machine

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US (1) US3590906A (enrdf_load_stackoverflow)
FR (1) FR2025275A5 (enrdf_load_stackoverflow)
GB (1) GB1200507A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704743A (en) * 1969-07-21 1972-12-05 Baker Perkins Ltd Method and apparatus for manufacture of cold setting foundry moulds and cores
US3802484A (en) * 1972-08-08 1974-04-09 A Ovodov Apparatus for producing foundry cores
US3834442A (en) * 1972-08-18 1974-09-10 Baker Perkins Ltd Method and apparatus for the preparation of foundry moulds or cores
US3943991A (en) * 1972-07-14 1976-03-16 Baker Perkins Holdings Limited Method and apparatus for preparing foundry moulds or cores
US3966174A (en) * 1973-02-02 1976-06-29 Combustion Engineering, Inc. Premix nozzle for kold box process
US3978906A (en) * 1974-01-29 1976-09-07 Borden, Inc. Process for the rapid production of foundry molds and cores and to a composition for use therein
US3994332A (en) * 1975-04-21 1976-11-30 The Quaker Oats Company Apparatus and method for manufacturing cores and molds with means for independently releasing catalyst and resin mixes
US4000770A (en) * 1975-04-21 1977-01-04 The Quaker Oats Company Apparatus and method for manufacturing cores and molds
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
WO1980002240A1 (en) * 1979-04-13 1980-10-30 Inst Liteinogo Mash Installation for making casting moulds and cores of fluid mould materials
US4570694A (en) * 1982-01-25 1986-02-18 Lund Robert S Mold-blowing apparatus
US4643240A (en) * 1984-04-12 1987-02-17 Pettibone Corporation Method of blowing cores etc. using quick-set sand, and improved mold-blowing apparatus
US5698613A (en) * 1995-02-21 1997-12-16 Mancuso Chemicals Limited Chemical binder
EP1749598A4 (en) * 2004-03-23 2007-09-19 Sintokogio Ltd DEVICE FOR PRODUCING A MOLDING AND METAL MOLDING UNIT FOR THE USE THEREIN
US20090092171A1 (en) * 2005-06-15 2009-04-09 Yusuke Kato Method for controlling an expandable mixture
CN105344945A (zh) * 2014-12-02 2016-02-24 浙江春洲铝业有限公司 一种自动化摩卡咖啡壶泥芯机
CN109986071A (zh) * 2019-05-15 2019-07-09 大连科承铸造装备科技有限公司 铸造生产线

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1369445A (en) * 1971-03-29 1974-10-09 Baker Perkins Ltd Method and apparatus for preparing foundry moulds and cores
GB1418491A (en) * 1972-07-14 1975-12-24 Baker Perkins Holdings Ltd Method and apparatus for preparing foundry moulds or cores

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1533383A (en) * 1922-11-13 1925-04-14 Donald J Campbell Molding-sand-handling machine
US2852818A (en) * 1954-11-26 1958-09-23 Shalco Engineering Corp Core blowing machine for making shell molds
US3007216A (en) * 1958-10-20 1961-11-07 Herman Pneumatic Machine Co Molding apparatus
US3293702A (en) * 1963-06-12 1966-12-27 Maigret Andre Denis Lucien Machine for the preparation of foundry molds from match-plates
US3439733A (en) * 1965-12-27 1969-04-22 Sherwin Williams Co Foundry molding machine
US3472307A (en) * 1966-05-14 1969-10-14 British Cast Iron Res Ass Curing foundry cores and moulds

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1533383A (en) * 1922-11-13 1925-04-14 Donald J Campbell Molding-sand-handling machine
US2852818A (en) * 1954-11-26 1958-09-23 Shalco Engineering Corp Core blowing machine for making shell molds
US3007216A (en) * 1958-10-20 1961-11-07 Herman Pneumatic Machine Co Molding apparatus
US3293702A (en) * 1963-06-12 1966-12-27 Maigret Andre Denis Lucien Machine for the preparation of foundry molds from match-plates
US3439733A (en) * 1965-12-27 1969-04-22 Sherwin Williams Co Foundry molding machine
US3472307A (en) * 1966-05-14 1969-10-14 British Cast Iron Res Ass Curing foundry cores and moulds

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704743A (en) * 1969-07-21 1972-12-05 Baker Perkins Ltd Method and apparatus for manufacture of cold setting foundry moulds and cores
US3943991A (en) * 1972-07-14 1976-03-16 Baker Perkins Holdings Limited Method and apparatus for preparing foundry moulds or cores
US3802484A (en) * 1972-08-08 1974-04-09 A Ovodov Apparatus for producing foundry cores
US3834442A (en) * 1972-08-18 1974-09-10 Baker Perkins Ltd Method and apparatus for the preparation of foundry moulds or cores
US3966174A (en) * 1973-02-02 1976-06-29 Combustion Engineering, Inc. Premix nozzle for kold box process
US3978906A (en) * 1974-01-29 1976-09-07 Borden, Inc. Process for the rapid production of foundry molds and cores and to a composition for use therein
US3994332A (en) * 1975-04-21 1976-11-30 The Quaker Oats Company Apparatus and method for manufacturing cores and molds with means for independently releasing catalyst and resin mixes
US4000770A (en) * 1975-04-21 1977-01-04 The Quaker Oats Company Apparatus and method for manufacturing cores and molds
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
DE2953635C1 (de) * 1979-04-13 1984-04-05 Vsesojuznyj naučno-issledovatel'skij institut litejnogo mašinostroenija, litejnoj technologii i avtomatizacii litejnogo proizvodstva, Moskva Anlage zur Herstellung von Giessformen und Formkernen aus fliessfaehigen Formstoffen
WO1980002240A1 (en) * 1979-04-13 1980-10-30 Inst Liteinogo Mash Installation for making casting moulds and cores of fluid mould materials
US4570694A (en) * 1982-01-25 1986-02-18 Lund Robert S Mold-blowing apparatus
US4643240A (en) * 1984-04-12 1987-02-17 Pettibone Corporation Method of blowing cores etc. using quick-set sand, and improved mold-blowing apparatus
US5698613A (en) * 1995-02-21 1997-12-16 Mancuso Chemicals Limited Chemical binder
EP1749598A4 (en) * 2004-03-23 2007-09-19 Sintokogio Ltd DEVICE FOR PRODUCING A MOLDING AND METAL MOLDING UNIT FOR THE USE THEREIN
US20090092171A1 (en) * 2005-06-15 2009-04-09 Yusuke Kato Method for controlling an expandable mixture
EP1897633A4 (en) * 2005-06-15 2009-07-22 Sintokogio Ltd METHOD FOR CONTROLLING A FOAMING MIXTURE
US7766543B2 (en) 2005-06-15 2010-08-03 Sintokogio, Ltd. Method for controlling an expandable mixture
CN105344945A (zh) * 2014-12-02 2016-02-24 浙江春洲铝业有限公司 一种自动化摩卡咖啡壶泥芯机
CN105344945B (zh) * 2014-12-02 2023-04-14 浙江春洲铝业有限公司 一种自动化摩卡咖啡壶泥芯机
CN109986071A (zh) * 2019-05-15 2019-07-09 大连科承铸造装备科技有限公司 铸造生产线
CN109986071B (zh) * 2019-05-15 2024-05-10 大连科承铸造装备科技有限公司 铸造生产线

Also Published As

Publication number Publication date
FR2025275A5 (enrdf_load_stackoverflow) 1970-09-04
GB1200507A (en) 1970-07-29

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