US3796251A - Machine for manufacturing shell moulds for lost-pattern precision casting - Google Patents

Machine for manufacturing shell moulds for lost-pattern precision casting Download PDF

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Publication number
US3796251A
US3796251A US00173866A US3796251DA US3796251A US 3796251 A US3796251 A US 3796251A US 00173866 A US00173866 A US 00173866A US 3796251D A US3796251D A US 3796251DA US 3796251 A US3796251 A US 3796251A
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machine
motors
fact
accordance
rotation
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US00173866A
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English (en)
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P Jasson
P Chatourel
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PEUGEOT and RENAULT
RENAULT PEUGEOT FR
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PEUGEOT and RENAULT
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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

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  • ABSTRACT A machine for the manufacture of lost-pattem'shellmoulds for precision casting, comprising a plurality of eliminable central pattern armatures or a group of eliminable patterns, each fixed on an operating head by means of which the pattern or cluster is successively dipped into immersion tanks of liquid refractory slurry and of refractory grains in fluidized suspension, in which the armature is rotatably mounted about three axes of rotation, the first being the vertical axis of a roundabout carrying operating heads on frames and bringing the heads by a discontinuous movement on rotation, successively above the various tanks located round the roundabout, the second axis of continuous rotation coinciding substantially with that of the armature and the third axis, perpendicular to the second, passing through the center of a circumference to which
  • the present invention relates to a machine for the manufacture of lost-pattern shell-moulds for precision casting, comprising a plurality of eliminable central pattern armatures or a cluster of eliminable patterns, each fixed on an operating head by means of which the pattern or the cluster is successively dipped into immersion tanks of liquid refractory slurry and refractory grains in fluidized suspension.
  • the clusters of patterns taking into account their large weight, as soon as the first layers have been applied, are held suspended vertically by the operators when they are plunged into the tanks of slurry or the fluidized beds for adding the grains.
  • the armature is automatically rotated about three axes of rotation.
  • the first is the vertical axis of a roundabout which, by a discontinuous movement of rotation, brings the operating head successively above the various tanks.
  • the second axis of continuous rotation coincides substantially with that of the armature, and the third, perpendicular to the second, passes through the center of a circumference to which this second axis is tangential, the armature being external to the said circumference.
  • the rotation about the third axis is an angularly limited pivotal movement which is however sufficient to dip the pattern or the cluster' of patterns into each tank and remove them from the tank during the interruption in rotation of the said roundabout.
  • The. raised position of the mould corresponds to its draining and handling position between one tank to the other.
  • the pivotal movement is advantageously effected between the dipping position, during which the armature is orientated downwards, the second axis being then substantially vertical, and the drainage position during which the armature is obliquely orientated upwards, the angle swept out by the armature being less than 180.
  • the patterns are fixed on the operating heads by fitting their tubular central armature on a fixing rod which locks the said armature in position by the inflation of deformable bearing surfaces which expand under the continuous action of elastic means, a compensation of these elastic means permitting the release of the expandable bearing surfaces and the removal of the moulds produced on the patterns.
  • the object of the present invention is a machine which enables the method described aboveto be carried into effect.
  • each armature is rotatably mounted around three axes of rotation, the first of which is the vertical axis of a roundabout carrying, through the intermediary of frames,
  • each armature and each operating head are respectively driven by a first, a second and a third motor, the first and the third of which are controlled automatically in such manner by control devices that the rotation of the armatures and their operating heads about their third axis is an angularly limited pivotal movement which is however sufficient to dip the pattern or the cluster of patterns into eachtank and to remove them from the said tank during the interruptions in the rotation of the said roundabout.
  • the roundabout comprises a circular platform mounted for free rotation about a fixed vertical column supported by a base, centered on the first axis and on the upper part of which are fixedly mounted the three motors, each connected to a driving element of a temporary coupling located in the horizontal circular path of engagement of the driven elements which are rigidly fixed to the operating heads by means of pivots centered on the third axes, while the platform is driven by a roller applied against-its external edge and con nected to the first motor.
  • the motors and control members of the machine will advantageously be hydraulic.
  • FIG. 1 is a general view in perspective of a machine with four stations, two for dipping and two for powdering by fluidized beds, arranged alternately on the circumference.
  • FIG. 2 is a plan view of the machine.
  • FIG. 3 shows a part of the machine seen in partial cross-section taken along the line IIIIII of FIG. 2.
  • FIG. 4 is a view in cross-section of an operating head pivot, of its driving device and its frame.
  • FIG. 5. shows a third motor, seen in cross-section, taken along the line VV of FIG. 3.
  • FIG. 6 shows an operating head provided witha cluster of patterns in course of production, seen in crosssection taken along the line VIVI of FIG. 4.
  • FIG. 7 is a plan view of the first motor and its driving roller.
  • the machine comprises essentially operating heads 1, four in number in the case of the example shown, mounted on a central roundabout, the platform 2 of which is surrounded by fluidized bed tanks 3 and immersion tanks 4, the assembly being mounted on a common base-plate 5.
  • On the rotating platform 2 are mounted frames 6 supporting the operating heads 1.
  • this platform ensures, by successive rotations through about a first central vertical axis 7, the conveyance of the assemblies of clusters of patterns 8 and operating heads 1 from one work station to another, at which it is locked during the dipping operations of the clusters 8.
  • These clusters are mounted on the operating heads 1 by engaging their tubular central armatures 9 on the fixing rod 11, having clamping bearing surfaces expansible by compression of deformable surfaces 10 constituted for example by rubber rings kept continuously compressed in the state of rest (controls not operated) by elastic meanss 12 (not shown) located in the spindle of the head 1.
  • the operating heads 1 are each equipped with a second motor 16, ensuring for the moulds 8 in course of formation a continuous rotation about a second axis 13 which corresponds to their fixing axis, together with a partial rotation through an angle a about a third horizontal axis 14, perpendicular to the axis 13 and staggered with respect to this axis.
  • This partial rotation obtained by means of third motors 17, brings the mould 8 into the substantially vertical position shown at 8 (FIG. 6) at which it plunges fully into the immersion or powdering tanks, after having ensured its progressive penetration following a downward movement with rotation and a constant variation of inclination.
  • the mould is then brought back, by reverse rotation through the angle a, into a reversed oblique lifting position 8 at whiclithe drainage of the excess liquid or of the excess grains is effected before the movement of a quarter-turn of the whole unit above the following tank (FIG. 6).
  • the method may be adapted to various types of moulds and there may be obtained in a repetitive manner for each of them the dipping program which corresponds to the best conditions.
  • the machine shown is essentially driven and controlled by hydraulic-elements which presents numerous advantages with respect to the flexibility of the movements and reliability of operation.
  • the platform 2 is mounted on bearings 18,19 and 20,
  • a central tubular element 22 surrounds the column, so that the bearings 18 and 19 are protected by this element while the bearing 20 is protected by-the platform 2.
  • the third motors 17 are double-acting jacks, the piston rod 38 of which is rigidly fixed to a toothed rack 39 engaging with a toothed ring 40 rigidly fixed for rotation to the sheath 32 (see FIG. 5).
  • the pivots 26 of these latter, rotatably mounted in the frames 6, are provided with a braking pulley 31 connected by a cable 42 to the piston rod 43 of ajack 44 constituting a pneumatic spring fixed on the corresponding frame 6 (see FIG. 4) and supplied with fluid through the intermediary of a set of rotary joints 45 provided round the fixed column 21 (see FIG. 3).
  • the operating heads 1 are provided with second motors 16 (fluid-tight rotary) driving the fixing rods 11 for the central armatures 9 of the patterns or clusters of patterns.
  • the spindle of the operating head 1 comprises a compensating jack (not shown), the action of which is capable of opposing that of the elastic means which keep under compression the deformable bearing surfaces of the fixing rods 11.
  • the motors 16 and the compensating jacks are supplied with driving or control fluid by means of the set of rotary joints 45 (see FIG. 3), of another set of rotary joints 46 provided in the frame 6 round thepivot-26 (see FIG. 4), and of axial conduits 47 formed in the pivot 26 (see FIG. 6).
  • joints 45 are protected by a skirt 48 formed by the supports 23 which surround the column 21 (see FIG. 3). Furthermore, the fixing rods 11 are provided at their base with a drainage collar 49 protecting the spindle of the operating heads 1 when they are lifted.
  • Distributors 50 mounted on the platform 2 and controlled by sliding rods, the extremities of which are located in the path of a fixed cam (not shown), are intercalated in such manner in conduits coupling together the two sets of rotary joints 45 and 46 that they permit the supply of driving fluid. either to the compensating jacks of the operating heads 1 or to the second motors 16 of these heads.
  • the discontinuous rotation of the platform 2 is effected by a driving unit 51 capable of pivoting horizontally about a fixed vertical axis 52 rigidly fixed to the base 5.
  • This unit comprises a rotary fluid motor (first motor) driving by means of a gear (not shown) a roller 53 with a vertical axis capable of bein applied against a rolling track 54 provided on the outer edge of the platform 2 (see FIG. 7).
  • a hydraulic jack 55 is articulated by its cylinder on the base 5 and by the extremity of its piston rod on the driving unit 51, the position of the jack 55 with respect to the unit 51 and to the pivotal point of this latter being such that this jack enables the unit 51 to pivot so as to apply the roller 53 against the rolling track 54, or to move it away from this track.
  • a hydraulic jack 56 constituting a fifth motor, fixed on the base, actuates a locking device comprising an element capable of being engaged in a housing formed in another element.
  • the element 57 connected to the piston rod of the jack 56 is arranged so as to slide radially with respect to the roundabout, and the other element 58 is provided at a number of peripheral points on the platform in such manner that the sliding element 57 is located facing a corresponding element 58 on the platform 2 as soon as the roller 53 has moved away from the edge of'the platform.
  • the first motor 15 driving the roundabout, the third motors 17 causing the pivotal movement of the operating heads 1, the fourth motor 55 controllingthe pivotal movement of the driving unit 51 and the fifth motor 56 ensuring the locking action, do not rotate with the platform 2 and are directly connected to fluid conduits outside the roundabout.
  • the second motors 16 driving the patterns or clusters of patterns in rotation, the compensating jacks in the spindles of the operating heads 1 and the jacks 44 constituting the pneumatic spring aresupplied through the intermediary of the sets of rotary joints 45 communicating with the external source or sources of fluid by axial passages provided in the fixed vertical column 21.
  • the motors providing the movements of the various mobile elements of the machine are controlled, with a view to obtaining an automatic cycle of operation comprising a number of successive operations, by mean of detectors mounted in such manner, known per se, in the path of the moving elements carrying out the operations, that they initiate the next following operation from a pre-determined position of these mobile elements.
  • detectors mounted in such manner, known per se, in the path of the moving elements carrying out the operations, that they initiate the next following operation from a pre-determined position of these mobile elements.
  • electronic proximity detectors there are provided, among others, electronic proximity detectors.
  • the platform 2 and the driving coupling element 27 are rigidly fixed for rotation with cams co-operating with rods controlling deceleration members interposed in the supply circuits respectively of the first and third motors 15 and 17.
  • a cam of this kind 61 rigidly fixed to the sheath 33 acting through the intermediary of a rod 62 pro vided with a roller 63 on a deceleration member 64,
  • FIG. 4 constituted by a throttling device inserted in the supply conduit of the jack 17, has been shown in FIG. 4.
  • the machine according to the invention may be associated with a fluid-tight electronic control cubicle receiving for example the signals emitted by the electronic proximity detectors and supplying the impulses controlling the operation of the various motors. It is clear that a cubicle of this kind permits programmed automatic working of the machine.
  • a machine for manufacturing lost-pattern shell moulds comprising a plurality of eliminable central pattern armatures or a cluster of eliminable patterns, each fixed on an operating head for successively dipping each pattern or cluster into immersion tanks of liquid refractory slurry and of refractory grains in a fluidized suspension, each armature being rotatably mounted about three axes of rotation, the first of which is the vertical axis of a roundabout to which said operating heads are attached by frames, said roundabout comprising a circular platform mounted for free rotation about a fixed vertical column supported by a base plate for bringing said operating-heads by a discontinuous movement of rotation successively above a plurality of tanks which are located around said roundabout, the second of said three axes being an axis of continuous rotation coinciding substantially with that of the armature, said machine being characterized in that the third of said three axes is perpendicular to the second and passes through the center of a circle to which said second axis is tangential, being on said second second
  • a machine in accordance with claim 1 characterized by the fact that one of the driving elements of the couplings is a pair ofjaws, the opening of which is horizontal during the rotation of the roundabout, while the other driving element comprises two horizontally aligned rollers, one alongside the other during this rotation for engaging said jaws in said position.
  • one of the coupling elements constitutes one of the arms of a lever mounted to oscillate about an axis perpendicular to the pivotal axis of the element in a driving sheath driven by a third motor, the other arm being provided with a counter-weight, and
  • a machine in accordance with claim 1 characterized by the fact that the pivots of the operating heads are provided with a braking pulley coupled to a pneumatic spring controlled and fixed on the corresponding frame.
  • a machine in accordance with claim 7 characterized by the fact that a fifth motor is fixed on the baseplate for actuating a locking device comprising an element for engagement in a housing formed in another element, one of the elements coupled to the fifth motor being radially slidable with respect to the roundabout, and the other provided at a number of peripheral points on the platform, so that the slidable element is located facing a corresponding element on the 'platform as soon as the roller has moved away from the edge of the platform.
  • a machine in-accordance with claim 8 characterized by the fact that the said motors are fluid motors.
  • a machine in accordance with claim 7 characterized by the fact that the first and second motors are rotary. motors.
  • a machine in accordance with claim 8 characterized by the fact that the third, fourth and fifth motors are jacks, the moving part of the third motors being coupled to a toothed rack engaging with a toothed wheel rigidly fixed for rotation with the driving element of the coupling.
  • a machine in accordance with claim 1 characterized by the fact that the motors for ensuring the movements of the various movingelements of the machine are controlled, for the purpose of obtaining an automatic operating cycle comprising a plurality .of successive operations, by means of detectors mounted in such manner in the path of the moving elements which carry out the operations, that they initiate the next following operation from a predetermined position of the said moving elements.
  • a machine in accordance with claim 16 characterized by the fact that it is associated with a fluidtight electronic control cubicle located in proximity to the machine and co-operating therewith for ensuring the automatic cycle of operation.
  • the operating heads comprise fixing rods of central armatures, the said rods having deformable bearing surfaces expansible under the continuous action of elastic means, while a compensating jack is mounted in the operating heads acting in opposition to the said elastic means, in order to permit the liberation of the corresponding central armature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Manipulator (AREA)
US00173866A 1970-09-15 1971-08-23 Machine for manufacturing shell moulds for lost-pattern precision casting Expired - Lifetime US3796251A (en)

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FR707033368A FR2104999B1 (de) 1970-09-15 1970-09-15

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US (1) US3796251A (de)
JP (1) JPS5320497Y2 (de)
DE (1) DE2145929C3 (de)
FR (1) FR2104999B1 (de)
GB (1) GB1353402A (de)
SU (1) SU419012A3 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569385A (en) * 1982-11-26 1986-02-11 M.C.L. Co., Ltd. System for the preparation of ceramic shell molds
US4727929A (en) * 1985-10-11 1988-03-01 Precision Metalsmiths, Inc. Investment shell molding apparatus and method
US5460217A (en) * 1993-08-25 1995-10-24 Mitsubishi Denki Kabushiki Kaisha Apparatus and method for wax tree coating and product manufacturing method using the apparatus and method
EP1537924A1 (de) * 2003-12-05 2005-06-08 United Technologies Corporation Verfahren und Vorrichtung zum Herstellen von Formmasken zum Präzisionsgiessen
US20140116998A1 (en) * 2012-10-30 2014-05-01 Hon Hai Precision Industry Co., Ltd. Laser processing apparatus
CN106180560A (zh) * 2016-07-21 2016-12-07 东营市东胜机械自动化有限公司 一种三臂制壳装置及制壳方法
CN108213355A (zh) * 2017-12-25 2018-06-29 温州智信机电科技有限公司 精密铸造制壳机
WO2020240190A1 (en) * 2019-05-28 2020-12-03 Va Technology Ltd Investment casting method and apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58137541U (ja) * 1982-03-09 1983-09-16 日産自動車株式会社 消失模型保持装置
DE3909102C1 (de) * 1989-03-20 1990-01-18 Adolf Hottinger Maschinenbau Gmbh, 6800 Mannheim, De
KR100860297B1 (ko) * 2007-06-08 2008-09-25 한국로스트왁스 주식회사 정밀주조 제품의 왁스 패턴 조립을 위한 치구
KR101861287B1 (ko) * 2017-09-08 2018-05-25 김준년 정밀주조를 위한 왁스패턴 조립용 치구

Citations (3)

* 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
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

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Publication number Priority date Publication date Assignee Title
DE98015C (de) *
FR691079A (fr) * 1930-03-04 1930-10-01 Machine à mouler continue à table tournante
FR945699A (fr) * 1947-04-10 1949-05-11 Perfectionnements aux cloches d'électrolyse
US2967440A (en) * 1959-05-11 1961-01-10 Pettibone Mulliken Corp Hydraulic indexing mechanism for foundry turntables
FR85201E (fr) * 1964-01-09 1965-07-02 Perfectionnement au moulage des matières spongieuses
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

Patent Citations (3)

* 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
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 (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4569385A (en) * 1982-11-26 1986-02-11 M.C.L. Co., Ltd. System for the preparation of ceramic shell molds
US4727929A (en) * 1985-10-11 1988-03-01 Precision Metalsmiths, Inc. Investment shell molding apparatus and method
US5460217A (en) * 1993-08-25 1995-10-24 Mitsubishi Denki Kabushiki Kaisha Apparatus and method for wax tree coating and product manufacturing method using the apparatus and method
EP1537924A1 (de) * 2003-12-05 2005-06-08 United Technologies Corporation Verfahren und Vorrichtung zum Herstellen von Formmasken zum Präzisionsgiessen
US6966354B2 (en) 2003-12-05 2005-11-22 United Technologies Corporation Shelling apparatus and methods for investment casting
US20140116998A1 (en) * 2012-10-30 2014-05-01 Hon Hai Precision Industry Co., Ltd. Laser processing apparatus
US9149887B2 (en) * 2012-10-30 2015-10-06 Hon Hai Precision Industry Co., Ltd. Laser processing apparatus
CN106180560A (zh) * 2016-07-21 2016-12-07 东营市东胜机械自动化有限公司 一种三臂制壳装置及制壳方法
CN108213355A (zh) * 2017-12-25 2018-06-29 温州智信机电科技有限公司 精密铸造制壳机
WO2020240190A1 (en) * 2019-05-28 2020-12-03 Va Technology Ltd Investment casting method and apparatus

Also Published As

Publication number Publication date
JPS51148411U (de) 1976-11-27
SU419012A3 (ru) 1974-03-05
FR2104999A1 (de) 1972-04-28
DE2145929C3 (de) 1975-02-27
FR2104999B1 (de) 1973-08-10
DE2145929A1 (de) 1972-03-16
DE2145929B2 (de) 1974-06-12
GB1353402A (en) 1974-05-15
JPS5320497Y2 (de) 1978-05-30

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