US3788380A - Methods of manufacturing shell moulds - Google Patents

Methods of manufacturing shell moulds Download PDF

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Publication number
US3788380A
US3788380A US00153332A US3788380DA US3788380A US 3788380 A US3788380 A US 3788380A US 00153332 A US00153332 A US 00153332A US 3788380D A US3788380D A US 3788380DA US 3788380 A US3788380 A US 3788380A
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United States
Prior art keywords
axis
core frame
rotation
pattern
frame
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Expired - Lifetime
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US00153332A
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English (en)
Inventor
P Jasson
P Chatourel
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Renault SAS
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Renault SAS
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Publication date
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Publication of US3788380A publication Critical patent/US3788380A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • B22C13/085—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores by investing a lost pattern

Definitions

  • each disposable mould comprises a central core frame secured to an operating head utilized for immersing the pattern in succession into vessels containing alternately refractory slip and refractory grains in the form of fluidized suspension, respectively, said central core frame revolving automatically about the vertical axis of a turnstile adapted, through an intermittent rotation, to bring in succession said head above the vessels, about another axis of said core frame and finally about an axis perpendicular to said core frame axis for O0 1 M.
  • each disposable pattern or cluster of patterns comprises a central or core frame secured to an operating head utilized for immersing the pattern or cluster of patterns in succession into vessels filled alternately with liquid refractory slip immersion and refractory grains in fluidized suspension, respectively.
  • the fragility of the lost patterns consisting as a rule of hard, brittle materials, constituted heretofore a chief obstacle in preventing a complete automation and mechanization of these mould immersion and dusting operations, together with the necessity of obtaining layers having a thickness as uniform as possible through proper handling of said moulds in combination with a constant visual checking of the distribution of the refractory products over their surface.
  • the clusters of patterns due to their considerably weight when the very first layers have been applied thereto, are held in a vertical suspended condition by the operators during their immersion into the slip-containing vessels or into the fluidized beds used for dusting the patterns with refractory grains.
  • the liquid deposits constitute layers that are thicker at the lower ends than near the handling supports, and conversely, as a consequence of a greater erosion effect, the grain layers are thinner at the ends than near the handles.
  • lt is the chief object of the present invention to avoid the inconveniences set forth hereinabove by imparting to the moulds, through fully mechanical means, a combination of movements of rotation producing the immersion thereof into slip-containing baths and into fluidized beds.
  • the method constituting the subject-matter of the present invention is characterized in that the core frame is caused to revolve automatically about three axes of rotation, i.e., a first axis of rotation constituting the vertical axis of a tumstile adapted, by an intermittent rotational movement, to bring the operative head in succession above the various vessels; a second axis of continuous rotation, substantially coincident with the axis of said core frame, and a third axis of rotation, perpendicular to said second axis, which passes through the center of a circumference to which said second axis is tangent, the core frame lying externally of said circumference, while the rotation about said third axis consists of an angularly limited pivotal movement sufficient however for immersing into, and removing from, each vessel, the pattern or cluster of patterns during the pauses occurring during the rotational movement of said turnstile.
  • the mould is caused to penetrate into and emerge from the slip bath vessels and fluidized bed vessels with a sweeping movement which is both axial and rotational, according to constantly variable mould inclinations, thus ensuring a uniform distribution of the products over the mould surface.
  • the upper position of the mould corresponds to its dripping position and also to its transfer from one vessel to another.
  • the pivotal movement may take place between the immersion position during which the core frame is directed downwards, while the second axis is substantially vertical, and the dripping position during which the core frame is inclined obliquely upwards, the angle of sweep of this frame being inferior to
  • the patterns are secured to the operating heads by fitting their central tubular member on a fastening rod locking said frame in position, as a consequence of the inflation of deformable bearing surfaces expansible by virtue of the permanent action of resilient means, a suitable compensation of these resilient means permitting the release of the expansible bearings and the disassembling of the moulds formed on the patterns.
  • An additional and valuable feature of the combination according to this invention of simple rotational movements is its great facility of construction by resorting to mechanical element driven from hydraulic means, according to a preferred form of embodiment of the invention.
  • the high flexibility and easy adjustment characteristics of hydraulic control systems af ford extremely sensitive adjustments consistent with the mould fragility.
  • the various rotational speeds, of the different movements may easily be adjusted and varied according to a predetermined programme.
  • the method of this invention may be carried out by using any suitable installation comprising a turnstile having disposed in radial relationship thereto the various vessels and comprising rotary and pivoting supports for the patterns, the necessary synchronism of the various movements being obtained, for example, by using toothed gears and/or motors responsive to limit switches or like control means.
  • FIG. 1 is a general perspective view of the apparatus comprising a four-station turnstile according to this preferred form of embodiment.
  • FIG. 2 is an elevational view of a mould handling head, during the mould making process, showing the various positions assumed by said mould.
  • FIG. 1 The structure shown in FIG. 1 comprises four operating heads I mounted on a central turnstile 2 surrounded by vessels 3 containing fluidized beds, alternating with other vessels 4 containing immersion products, this assembly being adapted to be supported by a common base 5.
  • Mounted to the rotary platform of turnstile 2 are frames 6 supporting the aforesaid operating heads 1.
  • This platform is adapted, by successive angular movements through 90 about a first vertical central axis 7, to transfer the clusters 8 of patterns and the operating heads 1 from one working station to another, where this platform is locked during the cluster immersion operations.
  • These clusters are secured to the operating heads 1 by engaging or fitting their central tubular frames 9 to the fastening rod 11 provided with clamping bearing surfaces adapted to be expanded by compressing deformable bearings consisting for example of rubber rings constantly kept in a compressed condition when inoperative (non-activated controls) by resilient means 12 (FIG. 2) incorporated in the spindle of head 1.
  • the control or operating heads 1 are adapted to impress to the moulds 8 being formed a continuous rotational movement about a second axis 13 corresponding to their mounting axis, and also a partial rotation through an angle a (FIG. 2) about a third horizontal axis 14 perpendicular to said axis 13 and somewhat offset in relation thereto.
  • This partial rotation brings the mould 8 to a substantially vertical position as shown at 8 in FIG. 2, so that it is immersed completely in the corresponding immersion or dusting vessel, after having caused its gradual penetration with a downward movement attended by a rotation and a constant change in its inclination. Then the mould is brought back, by reversing its rotation through the angle a, to the reverse oblique upper position 8 in which the excess liquid or grains are dripped off before the assembly is moved again through one-fourth of a revolution above the next vessel.
  • the method may be adapted to different mould types and thus the immersion programme corresponding to the best possible operating conditions may be obtained in a reproductible manner and with all the flexibility afforded by the use of hydraulic control and/or driving means.
  • control and driving means notably for a turnstile machine 2 controlling the rotational movements according to the method of this invention, is disclosed in a co-pending patent application in the name of the same applicant.
  • each disposable pattern or pattern cluster comprises a central core frame secured to a control or operating head adapted to immerse the pattern or pattern cluster successively into a vessel containing liquid refractory slip and into a vessel containing refractory grains in the form of a fluidized suspension, and in which said core frame is caused to rotate automatically about three axes of rotation of which the first axis is the vertical axis of a turnstile adapted through an intermittent rotational movement to bring said operating head in succession above said vessels, the second axis of continuous rotation being substantially coincident with that of said core frame, and the third axis of rotation being a horizontal axis which is perpendicular to said second axis, which intersects said first axis and which passes through the center of a circumference to which said second axis is tangent, said core frame being disposed externally of said circumference, the rotation about said third axis consisting of an angularly limited pivotal movement

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US00153332A 1970-07-03 1971-06-15 Methods of manufacturing shell moulds Expired - Lifetime US3788380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR707024842A FR2096838B1 (ko) 1970-07-03 1970-07-03

Publications (1)

Publication Number Publication Date
US3788380A true US3788380A (en) 1974-01-29

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ID=9058272

Family Applications (1)

Application Number Title Priority Date Filing Date
US00153332A Expired - Lifetime US3788380A (en) 1970-07-03 1971-06-15 Methods of manufacturing shell moulds

Country Status (4)

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US (1) US3788380A (ko)
DE (1) DE2133128C3 (ko)
FR (1) FR2096838B1 (ko)
GB (1) GB1353401A (ko)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024300A (en) * 1975-06-27 1977-05-17 General Electric Company Process for making an investment mold for casting and solidification of superalloys therein
US4265296A (en) * 1978-12-21 1981-05-05 Caterpillar Tractor Co. Investment casting mold forming apparatus
CN103567397A (zh) * 2013-11-18 2014-02-12 中国南方航空工业(集团)有限公司 一种结构件精密铸造用蜡模组合定位装置
CN105290329B (zh) * 2015-11-12 2017-07-25 沈阳黎明航空发动机(集团)有限责任公司 一种通用单晶涡轮工作叶片模组组合定位方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2584627A (en) * 2019-05-28 2020-12-16 V A Tech Ltd Investment casting method and apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307232A (en) * 1965-01-04 1967-03-07 Edward J Mellen Jr Method and apparatus for forming shell molds by the use of a fluidized bed drying system
US3429358A (en) * 1964-09-21 1969-02-25 Howmet Corp Method for manufacture of refractory shell molds
US3503435A (en) * 1967-06-15 1970-03-31 Adam Dunlop Apparatus for use in the manufacture of shell moulds
US3602288A (en) * 1968-06-25 1971-08-31 Howmet Corp Apparatus for manufacture of refractory shell molds

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1071071A (en) * 1964-05-13 1967-06-07 Rolls Royce Improvements in or relating to forming shell moulds
FR1458404A (fr) * 1964-09-21 1966-03-04 Howe Sound Co Fabrication de moules-enveloppes réfractaires
FR1524356A (fr) * 1967-03-31 1968-05-10 Bertin & Cie Procédé de blocage et de préhension et dispositifs pour son application

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429358A (en) * 1964-09-21 1969-02-25 Howmet Corp Method for manufacture of refractory shell molds
US3307232A (en) * 1965-01-04 1967-03-07 Edward J Mellen Jr Method and apparatus for forming shell molds by the use of a fluidized bed drying system
US3503435A (en) * 1967-06-15 1970-03-31 Adam Dunlop Apparatus for use in the manufacture of shell moulds
US3602288A (en) * 1968-06-25 1971-08-31 Howmet Corp Apparatus for manufacture of refractory shell molds

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024300A (en) * 1975-06-27 1977-05-17 General Electric Company Process for making an investment mold for casting and solidification of superalloys therein
US4265296A (en) * 1978-12-21 1981-05-05 Caterpillar Tractor Co. Investment casting mold forming apparatus
CN103567397A (zh) * 2013-11-18 2014-02-12 中国南方航空工业(集团)有限公司 一种结构件精密铸造用蜡模组合定位装置
CN103567397B (zh) * 2013-11-18 2015-07-15 中国南方航空工业(集团)有限公司 一种结构件精密铸造用蜡模组合定位装置
CN105290329B (zh) * 2015-11-12 2017-07-25 沈阳黎明航空发动机(集团)有限责任公司 一种通用单晶涡轮工作叶片模组组合定位方法

Also Published As

Publication number Publication date
GB1353401A (en) 1974-05-15
DE2133128C3 (de) 1974-07-18
DE2133128B2 (de) 1973-12-06
DE2133128A1 (de) 1972-01-20
FR2096838A1 (ko) 1972-03-03
FR2096838B1 (ko) 1973-05-25

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