US3727671A - Pattern assembly for a foundry core unit for casting a cylinder block of a multi-cylinder internal combustion engine - Google Patents

Pattern assembly for a foundry core unit for casting a cylinder block of a multi-cylinder internal combustion engine Download PDF

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Publication number
US3727671A
US3727671A US00177936A US3727671DA US3727671A US 3727671 A US3727671 A US 3727671A US 00177936 A US00177936 A US 00177936A US 3727671D A US3727671D A US 3727671DA US 3727671 A US3727671 A US 3727671A
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United States
Prior art keywords
core
pattern
casting
internal combustion
combustion engine
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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
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US00177936A
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English (en)
Inventor
K Kawai
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.)
Toyota Industries Corp
Original Assignee
Toyoda Automatic Loom Works Ltd
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Filing date
Publication date
Application filed by Toyoda Automatic Loom Works Ltd filed Critical Toyoda Automatic Loom Works Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores

Definitions

  • ABSTRACT [30] Foreign Application Pnonty Data 7
  • the core-making pattern assembly is comprised of two Sept. 7, 1970 Japan ..45/7832l i pattern members i g a p y recesses corresponding to the number of cylinders in a V-type [52] 11.8.
  • a movable member is [51] Int. Cl. ..B22c 7/06, 1322c 13/12 mounted in each recess and carries a core section for [58] Field of Search 164/137, 230, 369,
  • these cylinder core elements are assembled to the core main body through high precision male and female mating surfaces and through the glueing technique.
  • FIG. 1 is a cross-sectional view of a preferred embodiment of the pattern assembly according to the present invention.
  • FIG. 2 is an exploded sectional viewof the pattern assembly shown in FIG. 1, yet being shown on an enlarged scale.
  • FIG. 3 is a schematic perspective view of a composite core prepared by the pattern assembly according to the invention and as a representative embodiment thereof.
  • FIG. 4 is a perspective view of an engine cylindermaking core used in the composite core manufactured by the pattern assembly according to the invention.
  • FIG. 1 essential parts of the core-making pattern assembly according to a preferred embodiment are shown in section.
  • the illustrated position is the closed position of the pattern assembly, defining a closed cavity within the assembly ready for blow-in molding of the core unit.
  • Numerals l and 1 represent a pair of side pattern members which can be moved from their working position shown to their sidewardly retracted position by respective operating pneumatic or hydraulic pistoncylinder units, not shown, which are conventional.
  • a number of cup-shaped separate pieces 2 and 2' ar ranged in line and each containing a core member 3 or 3' are attached to these pattern members I and l,
  • Core members 3 and 3' are previously and separately shaped from shellforming resin-coated sand. These core members 3 and 3' correspond to those parts of the composite core which are extremely difficult to draw.
  • Separate pieces 2 and 2' each have an external axial taper so as to be movable axially relative to respective side pattern pieces 11 and l, respectively, for easy attachement thereto and detachment therefrom.
  • Lower pattern member 4 and upper pattern member 5 are arranged to be moved vertically pneumatically or and 3' are positioned within the inside hollow spaces 6 and 6', respectively, as shown at the lower corners of FIG. 2 by chain-dotted lines 3" and 3" respectively.
  • the core members 3 and 3' are formed with end flanges 7 and 7', respectively, which are to be embedded within the shell-forming material of the main body 10 of the composite core unit generally shown at 11.
  • these end flanges 7 and 7' are positioned so as to protrude from within the inside spaces 6 and 6 of the separate pieces 2 and 2' when assembled in position as above referred to. It is necessary to select the direction of insertion of the core members 3 and 3' into respective separate pieces 2 and 2' and the direction of relative movement of separate pieces 2 and 2' relative to the side pattern members 1 and 1', respectively, into axial coincidence with each other.
  • the elemental assembly 2;3 or 2';3' is then brought from outside into engagement with receiving recess 8 or 8' formed in theside pattern member 1 or 1' and these parts are locked in their relative position by means of proper conventional fixing means, such as bolts and nuts, although not shown only for simplicity of the drawing.
  • each side pattern member 1 or 1 carries each four separate pieces 2 or 2, as shown schematically in FIG. 3.
  • side pattern members 1 and l' carrying the core members 3 and 3 respectively are advanced oppositely towards each other from their off-service position substantially shown in FIG. 2 to their operating position shown in FIG. I.Then, the lower and upper pattern members 4 and 5 are similarly advanced oppositely towards each other from their off-service to working position. In this way, a mold cavity 9 is formed in the thus completed pattern assembly.
  • the separate pieces 2 and 2' combined with respective core members 3 and 3' may be positioned at the receiving recesses 8 and 8' and then, the upper and lower pattern members can be closed.
  • FIG. I arrows B are shown for illustrating the direction of introduction of shell-molding resin-coated sand in the manufacture of the composite core.
  • binder phenolic resin 2.5 wt. of said sand; hardening agent hexamethylenetetramine dispersing agent calcium stearate wt. of said binder;
  • the blow-in pressure amounted to about 3 kg/cm.
  • the upper pattern member 5 is moved upwards in FIG. 1 and then separate pieces 2 and 2' are withdrawn from position.
  • the lower pattern member 4 is lowered and the side pattern members 1 and l' are opened. In this way, the composite core 11 for a cylinder block casting can be taken out from the core-making pattern assembly.
  • Glueing steps can be obviated, so as to increase the core manufacturing efficiency.
  • Casting fins can substantially be avoided.
  • Positioning and fixation of said core elements can be carried out in a highly simplified and highly reliable way.
  • a core-making pattern assembly comprising a plurality of opposingly movable pattern members including side pattern members adapted for preparing a composite core for casting a V-arranged multi-cylinder type internal combustion engine, said assembly being characterized in that each of said side pattern members detachably carries a separate piece positioned in a positioning recess formed in each of said pattern members, said separate piece carrying in turn a core section adapted for shaping an engine cylinder bore.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
US00177936A 1970-09-07 1971-09-07 Pattern assembly for a foundry core unit for casting a cylinder block of a multi-cylinder internal combustion engine Expired - Lifetime US3727671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45078321A JPS4917139B1 (enrdf_load_stackoverflow) 1970-09-07 1970-09-07

Publications (1)

Publication Number Publication Date
US3727671A true US3727671A (en) 1973-04-17

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ID=13658670

Family Applications (1)

Application Number Title Priority Date Filing Date
US00177936A Expired - Lifetime US3727671A (en) 1970-09-07 1971-09-07 Pattern assembly for a foundry core unit for casting a cylinder block of a multi-cylinder internal combustion engine

Country Status (4)

Country Link
US (1) US3727671A (enrdf_load_stackoverflow)
JP (1) JPS4917139B1 (enrdf_load_stackoverflow)
DE (1) DE2145169A1 (enrdf_load_stackoverflow)
GB (1) GB1329039A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932459A (en) * 1987-10-22 1990-06-12 Erana Augustin A Formation of foundry core blocks
US4989661A (en) * 1987-10-22 1991-02-05 Erana Augustin A Formation of foundry core blocks
US5054537A (en) * 1988-06-03 1991-10-08 Outboard Marine Corporation Lost foam pattern assembly for V-block engine
CN101797628B (zh) * 2009-02-06 2012-05-30 南方汇通股份有限公司 射芯砂芯上型特种砂磁力吸附方法
CN103736918A (zh) * 2014-01-29 2014-04-23 广西玉柴机器股份有限公司 大型柴油机高温冷却器砂芯模具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012106082A1 (de) * 2012-07-06 2014-01-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Vorrichtung und Verfahren zum Fertigen eines Gussteils
CN103286276B (zh) * 2013-05-21 2015-01-21 佛山市南海区巨子电机配件有限公司 一种电机外壳的铸造工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US899250A (en) * 1907-10-05 1908-09-22 W P Taylor Company Apparatus for making green-sand cores.
US1990179A (en) * 1933-12-15 1935-02-05 Gade Samuel Apparatus for manufacturing cores for valve bodies
FR1033973A (fr) * 1950-03-17 1953-07-17 Power Jets Res & Dev Ltd Perfectionnements apportés aux procédés de moulage de précision
US2783510A (en) * 1953-02-26 1957-03-05 Gen Motors Corp Cylinder block coring for v-engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US899250A (en) * 1907-10-05 1908-09-22 W P Taylor Company Apparatus for making green-sand cores.
US1990179A (en) * 1933-12-15 1935-02-05 Gade Samuel Apparatus for manufacturing cores for valve bodies
FR1033973A (fr) * 1950-03-17 1953-07-17 Power Jets Res & Dev Ltd Perfectionnements apportés aux procédés de moulage de précision
US2783510A (en) * 1953-02-26 1957-03-05 Gen Motors Corp Cylinder block coring for v-engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932459A (en) * 1987-10-22 1990-06-12 Erana Augustin A Formation of foundry core blocks
US4989661A (en) * 1987-10-22 1991-02-05 Erana Augustin A Formation of foundry core blocks
US5054537A (en) * 1988-06-03 1991-10-08 Outboard Marine Corporation Lost foam pattern assembly for V-block engine
CN101797628B (zh) * 2009-02-06 2012-05-30 南方汇通股份有限公司 射芯砂芯上型特种砂磁力吸附方法
CN103736918A (zh) * 2014-01-29 2014-04-23 广西玉柴机器股份有限公司 大型柴油机高温冷却器砂芯模具
CN103736918B (zh) * 2014-01-29 2016-02-24 广西玉柴机器股份有限公司 大型柴油机高温冷却器砂芯模具

Also Published As

Publication number Publication date
JPS4917139B1 (enrdf_load_stackoverflow) 1974-04-27
GB1329039A (en) 1973-09-05
DE2145169A1 (de) 1972-03-09

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