US3698471A - Automatically operated multiple cavity die for low-pressure chill-casting - Google Patents

Automatically operated multiple cavity die for low-pressure chill-casting Download PDF

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Publication number
US3698471A
US3698471A US75920A US3698471DA US3698471A US 3698471 A US3698471 A US 3698471A US 75920 A US75920 A US 75920A US 3698471D A US3698471D A US 3698471DA US 3698471 A US3698471 A US 3698471A
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United States
Prior art keywords
core
die
casting
castings
dies
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Expired - Lifetime
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US75920A
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English (en)
Inventor
Pierre Chatourel
Jean Lefebvre
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Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the .device according to this invention is characterized essentially in that the molds comprise each two half-dies, i.e., a fixed half-die and a movable half-die, that the mold cavities are aligned in even number and formed on the one hand in a fixed half-die receiving the feed duct and on the other hand in a movable half-die adapted to move by translation away from the fixed die and in the plane joint of these two half-dies, by means of retractable mold elements whether of single or compound type adapted to be assembled by means of core membersknown per se, wherein the core members are fitted in position or removed therefrom by standardized automatic control units each adapted to control two mold cavitiesand of which the core member fitting or release operations are produced through a sequence of mechanical movements known per se under the control of a single actuator, automatic means also known per se being associated with the device for ejecting and discharging the cluster of castings.
  • the molds comprise each two half-dies, i.e., a fixed half-die and a mov
  • this device ensures substantial savings in the usually'lost riser, constituting a serious inconvenience in die-casting processes, in comparison with conven tional gravity casting, since the only risers are the casting slot connected to the common molten-metal supply duct.
  • This advantageous feature is further improved in the case of flat-topped pistons cast by pairs in mutual opposition, since the number of castings is doubled for an equivalent weight of sprue or riser metal implemented. In either case, and especially in the last one, the casting slotopens into the thickest zone of the casting, thus ensuring a gradual setting of the metal and improving the quality of the final casting.
  • FIG. 1 illustrates an elevational and part-sectional general view of the device of this invention
  • FIG. 2 shows a cluster of 4 pistons cast by using the device of FIG. 1;
  • FIG. 3 illustrates the device of this invention in the specific case of flat-topped pistons cast in two linear rows of pistons disposed by pairs in a single cluster;
  • FIG. 4 illustrates in perspective a cluster of eight pistons cast by using the device of FIG. 3;
  • FIG, 7 illustrates in fragmentary section details of a three-element core assembling head of a mechanical control unit, the section being taken along the line 7 VII-VII of FIG. 6;
  • FIG. 8 shows in sectional view details of a three-element core assembling head,.the section being taken along the lineV-V'. of FIG. 6;
  • FIGS. 9 and 10 showin section constructional and operating details of a five-elementcore assembling head, the section being taken along the lines V-V' and VII-VII of FIG. 6; j
  • FIGS. 11 and 12 show the same details as FIGS. 8 and 9, respectively, but in the case of larger castings;
  • FIG. 13 is a sectional view taken along the line V-V' of FIG. 6 showing details of the assembling of the lateral core elements
  • FIG. 14 is section taken along the line XIV-XIV of FIG. 13;
  • FIG. 15 shows in section details of the assembling of the pivot means of the pivotal mounting of core elements, the section being taken along the line'VV of FIG.6,and
  • Y F IG. 16 is a section taken along the line XVI-XVI of FIG. 15.
  • FIG. 1 a low-pressure casting furnace 1 and its injection device 2 according to the above-mentioned patent application are associated with a fixed chill-casting half-die 3 having a plurality of mold cavities 3 this half-die 3 being rigid with a support 4 and a frame structure or floor 5.
  • a movable half-die 7 Secured to a tray 6 movable on said frame structure 5 is a movable half-die 7 having a plurality of mold cavities 7 symmetric to mold cavities 3,.
  • the mold bottom element 8 Mounted to the base of half-die 7 is the mold bottom element 8 receiving the multiple mold cavities 8, adapted to shape the piston crowns or heads, and also heated inbling of core elements 10 adapted in their'assembled condition to constitute the mold core. for shaping the inner cavity of the piston during the casting process.
  • Mechanisms 11 for inserting" and removing lateral core elements 1 l and controlling the casting stripping members, known per se, are also arranged within the half-die 7.
  • control unit 10 In operation, after injecting the molten metal through the duct2 and maintaining the metal pressure throughout the setting period, the control unit 10 is actua'ted for disassembling the core elements 10, by means of a cylinder and piston actuator 10; and then releasing these elements by raising the unit 10 along the slideways 9 by means of another cylinder and piston actuator 9
  • the mode of operation of this unit 10 will be described more in detail presently in the specification.
  • a device of the type illustrated in FIG. 1, equipped with a pair of units 10 disposed side byside, is designed for producing a cluster of four castings 1-2 interconnected through a duct 13 as shown in FIG. 2.
  • the quantity of injected metal depends only on the capacity of the furnace 1; in any case, the number of castings mentioned in this example concerning but a specific form of embodiment should not be construed as limiting the invention.
  • the pistons are disposed by pairs assembled by their tops along two rows, and the casting furnace is similarly of the low-pressure type 1 connected through a feed duct 2 to a fixed half-die 3 having mold cavities 3 formed therein; this fixed halfdie 3 is mounted to a fixed support 4 rigid with a frame structure 5.
  • Another half-die 3 rotatably movable about a shaft 3 completes the mold structure 3.
  • a movable tray 6 slidably mounted on the frame structure 5 receives the other half-die 7 having a plurality of mold cavities 7, and equipped symmetrically with supports 9 provided with slideways 9,.
  • Control Control units 10 are also provided for assembling and disassembling the core elements 10, for shaping the inner cavities of the pistons, these units 10 being also movable along slideways 9
  • the control units 10 are adapted simultaneously to disassemble and retract the core elements 10 and then control the backward movement of tray 6 along the frame structure 5 for releasing the die section 7. Then the removal of the core elements from half-die 3 will permit the upward movement of the mold element 3 carrying the cluster of castings 12 by rotating through about 90 about the shaft 3 the gripping of said cluster by means of a handling clamp (not shown), the release thereof in relation to mold element 3 by means of ejectors, and finally its discharge.
  • the mold element 3 may be raised separately after i the removal of the core members adapted to form the piston spindle bores, the cluster of castings remaining in the mold cavities 3 of the fixed half-die 3 from which it is subsequently removed by ejectors so as to fall into the discharge pit.
  • FIG. 4 shows a cluster of eight castings 12 thus obtained and interconnected by a casting sprue 13, these castings being assembled by pairs and in opposition.
  • the pistons of each pair are subsequently separated by cutting along the dash-lines 13
  • a sprue 13 substantially equivalent to that of the example shown in FIG. 2, this solution permits the casting of twice as many pistons.
  • the limitations of the number of castings by injection are the same as those mentioned in connection with the preceding example.
  • FIG. 5 illustrates a control unit for assembling and disassembling five-core elements for constituting the inner cavity of two pistons disposed side by side, as well as the mold elements of the example shown in FIG. 1; in the arrangement of FIG. 5 there are a central core member 14 and two lateral core members 15 constituting in conjunction with two other lateral core members 16 (not visible in this Figure) the configuration of the innercavity of piston 12.
  • the central core member 14 is rigid with a mounting head 17 permitting assembly thereof with a connecting member 18 rigid with the piston rod 19 of an actuator 10 controlling the mechanism.
  • a connecting member 18 rigid with the piston rod 19 of an actuator 10 controlling the mechanism.
  • a ring 20 and a rod 21 actuating the control means of the aforesaid actuator 9 at the end of the stroke of actuator 10
  • the end of rod 19 is hollow and adapted to house a coil compression spring 22 actuating in turn a push member 23 anda rod 24 bearing against an assembly comprising two pivot members 25 so as to urge said rod against core members 15.
  • These core members are rigid with the trunnion 26 and rack members 27 in meshing engagement with pinions 28 driven from the rack end 29 of the socket 30.
  • a spring-loaded ball 31 housed in a radial bore 37 in member 18 is adapted to slide along a groove 32 of socket 30.
  • a hole 33 at the end of this groove permits, by snapping the. ball 31 into it, detent-positioning the socket and member 18 in the upper position of said member 18.
  • the actuator 9 is adapted to operate a slide 34 rigid with the frame structure 35 of control head 10 to raise the latter.
  • FIG. 6 illustrates an assembly comprising two units 10A and 10B mounted side by side on a common frame structure 9. Lateral openings 36 formed in the body 35 illustrated in unit 108 permit the access to control holes 37 and the rotation of member 18 in the socket 30 by moving the ball 31 out from its groove 32.
  • the unit 10A shows the relative positions of the different component elements of the mechanism at the levels of the various sections.
  • FIGS. 7 and 8 The different movements of the control mechanism, in the case of a three-element core unit, are illustrated in FIGS. 7 and 8.
  • the assembly comprises a central core element 14 reproducing in conjunction with a pairof lateral core elements 15 the inner shape of the cavity of piston 12.
  • the mounting head 17 of core element 14 fits into a connecting member 18 similar to the five-element core mounting described in the foregoing, all the other component elements of the mechanism being also similar to those of the preceding example.
  • the central core member 14 is retracted by means of its operative connection 17 with the intermediate member 18 coupling said core member 14 to the piston rod 19.
  • the detentpositioning ball- 31 (FIG. 5) having moved along the groove 32 engages the hole 33 in member 30, thus moving the latter to the upper position 30 the mechanism comprising pinions 28, racks 27 and shafts 26 causing the core members 15 to be released in position 15 from the cavity of casting 12.
  • the rod 19 of actuator 10 controls through a rod 21 an electric limit switch (not shown) monitoring a solenoid-operated hydraulic valve (not shown) controlling the movement of actuator9 (FIG. 5) for raising the complete unit 10 and eventually releasing the core members l5from the cavities of castings 12.
  • a play of at least 2 mm is provided between thetwo core members 15 in position 15,, to avoid any contact between their assembling faces 15, 7
  • FIGS. 9 and 10 are section's taken along two orthogonal planes, showing the mechanism obtaining in the case of a five-element core assembly of the type shown in FIG. 5, i.e., a central core member 14 having lateral extensions 16'and covered on either side by another pair of lateral core members 15.
  • the half-sections clearly show the relative movements of the component elements of this mechanism.
  • FIGS. 11 and 12 show the same sections and the same movements in the case of larger castings, in order to illustrate the adaptability or flexibility of the mechanism.
  • FIG. 13 shows in detail the assembling of the lateral core elements 15 with the shafts 2'6 and racks 27.
  • FIG. 14 shows the locking action resulting from the engagement of dovetailed ends of core members 15 in racks 27 and the wedging thereon by the bevelled ends of shafts 26.
  • FIG. 15 illustrates the detail of the assembling of pivot means 25 of core members 16 with the central core member 14.
  • the members 25 assembled by a common shaft 40 are urged against the bottom 14,, of the central opening of core member 14 by the pressure exerted on rod 24 through the assembling head 17 by push member 23.
  • FIG. 16 shows the assembly of the lateral core members 16, pivotally mounted on shafts 41, with the pair of pivot members 25 engaging the shafts 41 and assembled by means of a central pin 40.
  • the member can be released laterally along the T-sectioned fitting grooves formed in the piston rod of actuator 19 and of assembling head 17, so that the central core member 14 can be retracted.
  • the core members 15 are disassembled beforehand through the backward movements of shafts or pivot pins 26, and the core members 16 are disassembled by the lateral removal, through openings 42 and 36, of shaft 40 and members 25. With this combination it is possible to replace the core member assemblies very rapidly, for instance in case of failure or damage, or when changing the type of tool, so that the control units 10 constitute standard mounting heads adaptable to a great number of combinations and applications.
  • An automatically operated multiple cavity die device for low pressure casting comprising:
  • a chill-casting mold comprising two half-dies, one of said half-dies being fixed and the other of said halfdies being movable, both half-dies having an even numbered plurality of mold cavities therein aligned in a joint plane of said half-dies;
  • injection means for injecting material into said mold cavity through said feed duct; means for moving the movable half-die toward and awa from the fixed half-die; retrac able core members oriented for entry into said mold cavities substantially along said joint plane of said half-dies;
  • automatic core assembly means for performing assembling and disassembling movements of said core members in a pair of two mold cavities, said core assembly means including only one piston actuator for actuating said assembly.
  • a device additionally comprising ejection means on the movable half-die, and an automatic handling clamp for discharging clusters of castings from said movable half-die.
  • a device additionally comprising ejection means on the fixed half-die, for discharging castings into a discharge pit after stripping and retracting the other half-die and the core members.
  • the halfdies define engine piston castings disposed symmetrically by pairs in opposition with joined heads, two symmetrical rows of automatic core assembly means being provided for actuating the core elements adapted to shape the inner cavities of said pistons, the fixed halfdie comprising a pivoting portion for clearing the casting duct.
  • a device wherein the actuator associated with the automatic core assembly means has the end of a piston rod connected to an intermediate connecting member rigid with a central core member of the device.
  • the automatic assembly means comprises a socket also movable in translation along the axis of said actuator, said connecting member being slidably mounted in said socket and held against rotation by a spring-loaded ball sliding in an inner groove formed in said socket and provided at its end with a hole for locking said socket against translation in relation to said intermediate connecting member.
  • socket has an end portion formed with rack teeth in meshing engagement with pini'ons driving other rack means assembled by dovetail fitting and lock pins to lateral core elements of the device.
  • a five-element core structure for shaping the inner cavities of castings, comprising two core elements constituting extensions of a central core element, said extensions mounted on pivot members, a rod urged against said pivot members by a push member and a spring enclosed in a hollow end portion of the piston rod of said actuator, and cam faces provided on said central core element for rocking said extensions by engaging rounded studs pivotally mounted on pins.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US75920A 1969-10-15 1970-09-28 Automatically operated multiple cavity die for low-pressure chill-casting Expired - Lifetime US3698471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6935366A FR2063426A5 (ru) 1969-10-15 1969-10-15

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US3698471A true US3698471A (en) 1972-10-17

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Country Status (7)

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US (1) US3698471A (ru)
JP (1) JPS4817415B1 (ru)
DE (1) DE2050750C3 (ru)
ES (1) ES383980A1 (ru)
FR (1) FR2063426A5 (ru)
GB (1) GB1322547A (ru)
SU (2) SU421169A3 (ru)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971111A (en) * 1973-02-14 1976-07-27 Regie Nationale Des Usines Renault Apparatus for transferring and finishing items cast several at a time in a chill mold
US4076070A (en) * 1974-10-09 1978-02-28 Regie Nationale Des Usines Renault Low-pressure diecasting machine
US4172489A (en) * 1976-09-28 1979-10-30 Regie Nationale Des Usines Renault Distribution box for low-pressure casting of foundry pieces
EP0030669A1 (de) * 1979-12-15 1981-06-24 RUSS-Elektroofen Produktions- Gesellschaft mbH & Co. KG Vorrichtung zum automatischen Niederdruckgiessen
US4508159A (en) * 1981-05-02 1985-04-02 Bayerische Motoren Werke Aktiengesellschaft Mold with feeder channel for the casting of metals, in particular, for low-pressure casting
US6588489B1 (en) 1998-03-27 2003-07-08 Tesma International Inc. Apparatus for die casting an internal passageway and a product manufactured therewith
CN102151816A (zh) * 2011-03-10 2011-08-17 山东滨州渤海活塞股份有限公司 铝活塞自动铸造机
RU2620231C2 (ru) * 2015-10-28 2017-05-23 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") Кокиль

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2254295A (en) * 1938-12-17 1941-09-02 Aluminum Co Of America Mold
US2496130A (en) * 1942-05-23 1950-01-31 Louis H Morin Method of casting separable fastener stringers
US2965938A (en) * 1956-06-21 1960-12-27 Permanent Mold & Die Co Inc Apparatus for casting pistons and the like
US3049768A (en) * 1959-04-30 1962-08-21 Gen Motors Corp Apparatus and process for casting pistons
US3283374A (en) * 1963-04-05 1966-11-08 Semi-automatic machines for chill casting hollow parts such as pistons

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181157A (en) * 1938-11-16 1939-11-28 Aluminum Co Of America Method and apparatus for pressure casting
US2254295A (en) * 1938-12-17 1941-09-02 Aluminum Co Of America Mold
US2496130A (en) * 1942-05-23 1950-01-31 Louis H Morin Method of casting separable fastener stringers
US2965938A (en) * 1956-06-21 1960-12-27 Permanent Mold & Die Co Inc Apparatus for casting pistons and the like
US3049768A (en) * 1959-04-30 1962-08-21 Gen Motors Corp Apparatus and process for casting pistons
US3283374A (en) * 1963-04-05 1966-11-08 Semi-automatic machines for chill casting hollow parts such as pistons

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971111A (en) * 1973-02-14 1976-07-27 Regie Nationale Des Usines Renault Apparatus for transferring and finishing items cast several at a time in a chill mold
US4076070A (en) * 1974-10-09 1978-02-28 Regie Nationale Des Usines Renault Low-pressure diecasting machine
US4172489A (en) * 1976-09-28 1979-10-30 Regie Nationale Des Usines Renault Distribution box for low-pressure casting of foundry pieces
EP0030669A1 (de) * 1979-12-15 1981-06-24 RUSS-Elektroofen Produktions- Gesellschaft mbH & Co. KG Vorrichtung zum automatischen Niederdruckgiessen
US4431046A (en) * 1979-12-15 1984-02-14 Russ-Elektroofen Produktiongsgesellschaft Mbh & Co. Automated low-pressure casting mechanism and method
US4508159A (en) * 1981-05-02 1985-04-02 Bayerische Motoren Werke Aktiengesellschaft Mold with feeder channel for the casting of metals, in particular, for low-pressure casting
US6588489B1 (en) 1998-03-27 2003-07-08 Tesma International Inc. Apparatus for die casting an internal passageway and a product manufactured therewith
CN102151816A (zh) * 2011-03-10 2011-08-17 山东滨州渤海活塞股份有限公司 铝活塞自动铸造机
CN102151816B (zh) * 2011-03-10 2013-04-24 山东滨州渤海活塞股份有限公司 铝活塞自动铸造机
RU2620231C2 (ru) * 2015-10-28 2017-05-23 Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" (ФГУП "ВИАМ") Кокиль

Also Published As

Publication number Publication date
DE2050750A1 (de) 1971-04-22
JPS4817415B1 (ru) 1973-05-29
DE2050750B2 (de) 1973-04-05
FR2063426A5 (ru) 1971-07-09
SU421169A3 (ru) 1974-03-25
SU441695A3 (ru) 1974-08-30
DE2050750C3 (de) 1973-10-25
GB1322547A (en) 1973-07-04
ES383980A1 (es) 1973-03-01

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