US3687590A - Mold-closing means, particularly for die-casting and injection molding machines for metals and synthetics - Google Patents

Mold-closing means, particularly for die-casting and injection molding machines for metals and synthetics Download PDF

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Publication number
US3687590A
US3687590A US1410A US3687590DA US3687590A US 3687590 A US3687590 A US 3687590A US 1410 A US1410 A US 1410A US 3687590D A US3687590D A US 3687590DA US 3687590 A US3687590 A US 3687590A
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United States
Prior art keywords
mold
plate
end plate
carrier plate
carrier
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Expired - Lifetime
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US1410A
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English (en)
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Wilhelm Cyriax
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • B29C45/6707—Mould opening, closing or clamping devices hydraulic without relative movement between the piston and the cylinder of the clamping device during the mould opening or closing movement
    • B29C45/6714—Mould opening, closing or clamping devices hydraulic without relative movement between the piston and the cylinder of the clamping device during the mould opening or closing movement using a separate element transmitting the mould clamping force from the clamping cylinder to the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/26—Mechanisms or devices for locking or opening dies

Definitions

  • a stationary mold-carrier plate mounted on columns, a stationary end plate, a moldcarrier plate movable between these stationary plates from a mold-open position to a mold-closed position, a pressure piece between the mold-carrier plate and the end plate, a pressure box or hydraulic intensifier mounted on the pressure piece for producing the closure pressure and for connecting the end plate with the movable mold-carrier plate only during the casting on injecting operation, at least two pistonandcylinder units acting between the movable mold-carrier and one of the stationary plates, and a thrust plate transversely slidable on the end plate so as to cover and uncover an aperture provided for the passage therethrough of the pressure piece, the pressure piece including a threaded sleeve or nut and a threaded spindle or ram.
  • This invention relates to a mold-closing device, particularly for die-casting and injection-molding machines, for metals and plastics.
  • Mold-closing devices which have a stationary mold-carrier plate accommodated upon crossbeams or columns, a stationary end plate likewise accommodated upon the cross-beams or columns, and a mold-carrier plate which is movable between these two plates from an open position into a closed position, and is guided upon the crossbeams or columns.
  • the closing and opening movements of the mold are carried out with comparatively low pressures, while for the attainment of the requisite closing pressure between the movable mold-carrier plate and the end plate during the injection operation, a pressure piece equipped with a pressure box or hydraulic intensifier is provided; the pressure piece connects the stationary end plate with the movable mold-carrier plate only during the injection operation, so as to enable the mold to be opened for the release of the molded member.
  • the pressure box of the pressure piece is accommodated upon the stationary end plate, separately from the press ram, in guiding rails, in order that it may be brought out of engagement with the press ram perpendicularly to the direction of motion of the mold-carrier plates.
  • Closing cylinders are arranged laterally on the end plate and on the movable mold-carrier plate.
  • the stationary moldcarrier plate has a diameter adapted to the diameter of the ram of the pressure box.
  • a bayonet-like hasp is provided on the end plate and this hasp, when the mold is closed, engages beneath the end of the cylinder, and becomes liberated, for the opening of the mold, after appropriate rotation.
  • the cylinder In the case of a further construction (DAS No. 1,138,535), the cylinder is fixed in the end plate, and extends out beyond the end plate.
  • the piston carries at its end the movable mold-carrier plate, equipped with a pressure box.
  • a number of pressure pieces are, secured to the piston of the pressure box and these, when the mold is closed, bear against a perforated disc, rotatably accommodated on the end plate.
  • the end plate itself must here be provided with apertures or gaps corresponding to the pressure pieces, the perforated plate, when the mold is opened, being rotated in such a way that the pressure pieces can pass through them, and therefore also through the end plate.
  • the end plate of this construction is therefore weakened by a number of apertures, firstly by the central aperture accommodating the cylinder, and then by the apertures required for the passage of the pressure pieces.
  • the pressure plate must therefore be of substantial thickness, so as to oppose the necessary resistance to bending.
  • the production of this end plate, with the perforated disc and the pressure pieces, of which several are required, is complicated, and very expensive.
  • a further disadvantage resides in the fact that the bridging over of the different stroke lengths given by the various molds has to be effected by the pressure box, which must be of a comparatively large volume, and therefore has the disadvantages already described above.
  • the closing device is likewise accommodated in the middle of the end plate, while the cylinder carries the freely movable mold-carrier plate, the piston of the closing device is secured in the end plate, and the end plate must have a casing accormnodating the cylinder of the closing device.
  • the adjusting of different stroke travels is effected by way of a rotatable sleeve accommodated in the end plate, by means of which the casing of the closing cylinder is adjusted in an axial direction.
  • the design or construction of the end plate is again very complicated, making this end plate very expensive to manufacture.
  • At least two diametrically opposite sliders are arranged, which, when the mold is closed, engage underneath the end of the clos-- ing cylinder, and lock the latter in its mold-closing position.
  • these sliders must be simultaneously retracted, in order that the closing cylinder may be able to enter its casing, accommodated in the end plate.
  • the guides for these sliders which serve for the locking, must be so constructed that in the locked position the slider is secured against tilting or canting.
  • the present invention has as its object obviating the disadvantages inherent in the known constructions, and providing a mold-closing device which is distinguished by a reliable method of working, with the lowest possible expenditure on construction, and in which the weakening of the end plate is reduced to the smallest possible extent.
  • the result is obtained that the requirements subsisting with these mold-closing devices as regards minimum weakening of the end plate and as regards simple adjustability to different strokes, are taken into account in an exemplary manner.
  • the arrangement, known in itself, of the closing cylinders it is possible to arrange a pressure piece midway between the end plate and the movable mold-carrier plate, so that only an aperture corresponding to the diameter of the ram of the pressure piece is required in the closure plate.
  • a thrust plate serving as a simple slider the cost of production is reduced to a minimum.
  • this thrust plate can be held by means of simple guiding rails secured upon the end plate, fixing in an exact end position is not required.
  • the pressure piece as a nutand-spindle unit, it is ensured that a pressure box of minimum volume may be employed.
  • the mold-closing device according to the invention is distinguished by its simple, cheap and reliable construction, and by the fact that it renders possible a simple arrangement of the requisite ejector, without thereby increasing the dimensions of the machine.
  • FIG. 1 is a side view of the mold-closing device, wherein the front closing cylinder is omitted;
  • FIG. 2 shows a horizontal section of the device according to FIG. 1, wherein the struts or crossbeams are located in the plane of section.
  • FIG. 1 shows the device with the mold opened, and FIG. 2 with the mold closed.
  • a mold-carrier plate 2 which is provided with a central aperture 3 for an injection cylinder 4 and an injection nozzle 5.
  • a stationary end plate 6 At the opposite end of the struts 1 there is a stationary end plate 6.
  • a movable mold-carrier plate 7. Between the mold-carrier plate 2 and the end plate 6 is arranged a movable mold-carrier plate 7.
  • two cylinders 8 are provided on the stationary mold-carrier plate 2, the piston rods 9 thereof being secured to the movable mold-carrier plate 7.
  • the two halves of the mold are marked 10 and 11.
  • the mold half 11 On one side of the movable moldcarried plate 7 is arranged the mold half 11, and to the other side are secured two parallel stems 12, which carry an intermediate plate 13, likewise guided upon the struts 1.
  • the structural members 7, 12 and 13 form a unit.
  • the cylinder 14 Upon the free surface of the intermediate plate 13 is arranged the cylinder 14 of a pressure box or hydraulic intensifier having a piston 15, which carries a pressure ram, consisting of a screw-threaded sleeve 16 secured upon the piston 15, and a ram or bolt 17 engaging in the latter.
  • a thrust plate 18 Upon that surface of the end plate 6 which faces the ram 17 is mounted a thrust plate 18, which is slidable between two guide rails 19, and which can close an aperture 20 in the end plate 6.
  • the intermediate plate 13 has apertures 22, through which the ejector abutments 21 can pass.
  • an ejector plate 23 which overlaps the apertures 22 and carries ejector pins 24, which engage in an aperture 25 in the movable mold-carrier plate 7.
  • the total length of pressure box and pressure plate and the thickness of the, thrust plate is greater than the length of the abutments 21 as measured from the mold-facing surface of the end plate.
  • a pistonandcylinder unit 26 which is attached to the thrust plate 18, and can displace the latter in the guide rails 19.
  • the method of operation of the apparatus according to the invention is as follows: When, according to FIG. 2, after production of a molded article with the mold halves l0 and 11 closed, these mold halves are opened to liberate the molded article, the pistonand-cylinder unit 26 is first actuated, and this draws the thrust plate 18 so far upwards in its guides 19 that the aperture 20 in the end plate 6 is uncovered.
  • the thrust plate 18 is pushed in front of the aperture 20.
  • the pressure box 14, 15 is supplied with pressure fluid, so that the ram 17 presses firmly upon the thrust plate 18, and the requisite closing pressure is exerted by way of the intermediate plate 13 and the stems 12 upon the movable mold-carrier plate 7.
  • the pressure box 14 is first relieved, so that the thrust plate 18 can be pulled upwards by the pistonand-cylinder unit 26, whereupon the procedure hereinbefore described is repeated.
  • the pressure box 14, 15 may alternatively be arranged on the end plate 6, in which case the cylinder 14 is secured upon the end plate 6, and the piston 15 carries the guide rails 19 with the thrust plate 18.
  • the pressure piece 16, 17 is now secured to the movable moldcarrier plate 13.
  • the pressure box 14, 15 must here be provided with an axial aperture, which corresponds to the aperture 20 in the end plate 6, in order that the pressure piece 16, 17 may be able to pass through the end plate 6, when the mold is being opened.
  • a mold-closing device comprising:
  • mold-closure means operable independently of said pressure box for shifting said movable mold-carrier plate between said positions;
  • variable-length adjustable ejector abutments mounted on said end plate and projecting from said surface thereof toward said mold, the effective length of said pressure box and pressure piece plus the thickness of said thrust plate being greater than the lengths of said ejector abutments measured from said surface of said end plate;
  • mold-carrier plates interconnectin said plates; a movable mold-carrier p ate slidab e along said rails between said end plate and said stationary moldcarrier plate between an open-mold position and a closed-mold position, said mold-carrier plates being adapted to mount respective mold halves;
  • a pressure box interposed between confronting surfaces of said end plate and said movable mold-carrier plate and including a piston member and a cylinder member connected to said movable moldcarrier plate, said pressure box being energizable during introduction of material into the mold to prevent separation of said mold halves and bearing in opposite directions on said end plate and said movable mold-carrier plate, said piston member being formed with a pressure piece extending in the direction of said end plate and constituted of a nut threadedly connected with a spindle for adjusting the effective length of said pressure piece, said end plate being provided with an aperture adapted to receive said pressure piece;
  • a thrust plate slidable along said surface of said end plate for selective axial alignment with and disalignment from said pressure piece for alternately covering said opening completely and uncovering said opening, said thrust plate overlying said surface of said end plate and being engageable with said pressure piece in a position of said thrust plate covering said opening;
  • a pistonand-cylinder unit mounted upon said end plate for shifting said thrust plate transversely to the direction of said movable mold-carrier plate along said rails;
  • mold-closure means operable independently of said pressure box for shifting said movable mold-carrier plate between said positions;
  • variable-length adjustable ejector abutments mounted on said end plate and projecting from said surface thereof toward said mold, the effective length of said pressure box and pressure piece plus the thickness of said thrust plate being greater than the lengths of said ejector abutments measured from said surface of said end plate;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US1410A 1969-01-13 1970-01-08 Mold-closing means, particularly for die-casting and injection molding machines for metals and synthetics Expired - Lifetime US3687590A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691901946 DE1901946A1 (de) 1969-01-13 1969-01-13 Formschleissvorrichtung,insbesondere fuer Druckgiess- und Spritzgiessmaschinen fuer Metalle und Kunststoffe

Publications (1)

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US3687590A true US3687590A (en) 1972-08-29

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US1410A Expired - Lifetime US3687590A (en) 1969-01-13 1970-01-08 Mold-closing means, particularly for die-casting and injection molding machines for metals and synthetics

Country Status (8)

Country Link
US (1) US3687590A (de)
JP (1) JPS4817130B1 (de)
AT (1) AT298715B (de)
CH (1) CH511656A (de)
DE (1) DE1901946A1 (de)
ES (1) ES375083A1 (de)
FR (1) FR2028188A1 (de)
GB (1) GB1292343A (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716323A (en) * 1971-12-14 1973-02-13 Mannesmann Meer Ag Injection molding machine
US3737278A (en) * 1971-02-25 1973-06-05 Battenfeld Maschfab Mould closing means
US4043730A (en) * 1975-05-13 1977-08-23 Luigi Bettonica Hydraulic press for the production of tiles, dishes, cups of ceramic material and the like
US4105385A (en) * 1976-07-14 1978-08-08 Karl Hehl Compact die closing unit for injection molding machines
US4128376A (en) * 1976-10-28 1978-12-05 Sergio Albertazzi Pressing arrangement for compressing ceramic and refractory materials into tile preforms
US4130384A (en) * 1977-11-09 1978-12-19 Macmillan Kenneth T Tire curing press
US4201533A (en) * 1977-12-20 1980-05-06 Battenfeld Maschinenfabriken Mold closing and locking device
US4240781A (en) * 1978-12-18 1980-12-23 Hpm Corporation Injection molding machine having dual tonnage traversing cylinder
US4273524A (en) * 1978-10-18 1981-06-16 Hull Corporation Platen type molding press
US4312828A (en) * 1978-12-18 1982-01-26 Hpm Corporation Method for opening die sections
US4345893A (en) * 1980-10-20 1982-08-24 Prince Corporation Molding machine
US4425091A (en) 1980-10-20 1984-01-10 Prince Corporation Molding machine
US4484874A (en) * 1981-10-23 1984-11-27 Mitsubishi Jukogyo Kabushiki Kaisha Tire vulcanizing press
US4487564A (en) * 1983-04-29 1984-12-11 Holdt J W Von Split mold lock
US4565517A (en) * 1984-01-28 1986-01-21 Hoesch Aktiengesellschaft Hydraulic press for pressing mats of plastic material reinforced with glass fibers
US4759280A (en) * 1986-12-29 1988-07-26 John T. Hepburn, Limited Hydraulic press with adjustable platen clearance
US4822274A (en) * 1988-01-20 1989-04-18 Harry Chan Hydraulic clamping unit for a molding apparatus
US4948359A (en) * 1987-12-11 1990-08-14 M. Yasui & Co., Ltd. Mold holding and positioning means for use with wax injector
WO1993000188A3 (en) * 1991-06-27 1993-04-29 Dbm Industries Ltd Die casting machine
US6592360B2 (en) * 1999-12-08 2003-07-15 Nissei Plastic Industrial Co., Ltd. Mold clamping apparatus of injection molding machine
US20050287245A1 (en) * 2004-06-26 2005-12-29 Maplan Maschinen Und Technische Anlagen, Planungs- Und Fertigungs-Ges, M.B.H. Closure unit for an injection moulding device
CN100453288C (zh) * 2005-03-25 2009-01-21 鸿富锦精密工业（深圳）有限公司 模具镶件的高度调节装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2670415B1 (fr) * 1990-12-18 1993-04-16 Fakrikian Arthur Dispositif de manóoeuvre d'une partie mobile industriel.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501329A (en) * 1946-05-23 1950-03-21 Baldwin Locomotive Works Thermo-injecting molding process
DE1006590B (de) * 1955-06-15 1957-04-18 Hahn & Kolb Formschliesseinrichtung fuer Press- und Spritzgiessmaschinen
GB912866A (en) * 1959-12-09 1962-12-12 Tos Rakovnik Hydraulic press for the injection moulding of synthetic plastic materials and the like
FR1364692A (fr) * 1963-05-13 1964-06-26 Perfectionnements aux dispositifs permettant d'assurer la fermeture et le serrage des moules dans les presses à injecter
US3156014A (en) * 1959-06-06 1964-11-10 Krauss Maffei Ag Injection molding machine
US3270372A (en) * 1963-04-30 1966-09-06 Mannesmann Meer Ag Extrusion molding machine
FR1483972A (fr) * 1966-04-26 1967-06-09 Lyonnaise Ventilation Perfectionnements aux dispositifs de fermeture de moule pour presses à injecter les matières plastiques
US3448488A (en) * 1967-01-11 1969-06-10 Beloit Eastern Corp Quick adjustment knock-out rod
US3528134A (en) * 1967-04-26 1970-09-15 Alfred Fischbach Injection molding apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501329A (en) * 1946-05-23 1950-03-21 Baldwin Locomotive Works Thermo-injecting molding process
DE1006590B (de) * 1955-06-15 1957-04-18 Hahn & Kolb Formschliesseinrichtung fuer Press- und Spritzgiessmaschinen
US3156014A (en) * 1959-06-06 1964-11-10 Krauss Maffei Ag Injection molding machine
GB912866A (en) * 1959-12-09 1962-12-12 Tos Rakovnik Hydraulic press for the injection moulding of synthetic plastic materials and the like
US3270372A (en) * 1963-04-30 1966-09-06 Mannesmann Meer Ag Extrusion molding machine
FR1364692A (fr) * 1963-05-13 1964-06-26 Perfectionnements aux dispositifs permettant d'assurer la fermeture et le serrage des moules dans les presses à injecter
FR1483972A (fr) * 1966-04-26 1967-06-09 Lyonnaise Ventilation Perfectionnements aux dispositifs de fermeture de moule pour presses à injecter les matières plastiques
US3448488A (en) * 1967-01-11 1969-06-10 Beloit Eastern Corp Quick adjustment knock-out rod
US3528134A (en) * 1967-04-26 1970-09-15 Alfred Fischbach Injection molding apparatus

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737278A (en) * 1971-02-25 1973-06-05 Battenfeld Maschfab Mould closing means
US3716323A (en) * 1971-12-14 1973-02-13 Mannesmann Meer Ag Injection molding machine
US4043730A (en) * 1975-05-13 1977-08-23 Luigi Bettonica Hydraulic press for the production of tiles, dishes, cups of ceramic material and the like
US4105385A (en) * 1976-07-14 1978-08-08 Karl Hehl Compact die closing unit for injection molding machines
US4128376A (en) * 1976-10-28 1978-12-05 Sergio Albertazzi Pressing arrangement for compressing ceramic and refractory materials into tile preforms
US4130384A (en) * 1977-11-09 1978-12-19 Macmillan Kenneth T Tire curing press
US4201533A (en) * 1977-12-20 1980-05-06 Battenfeld Maschinenfabriken Mold closing and locking device
US4273524A (en) * 1978-10-18 1981-06-16 Hull Corporation Platen type molding press
US4240781A (en) * 1978-12-18 1980-12-23 Hpm Corporation Injection molding machine having dual tonnage traversing cylinder
US4312828A (en) * 1978-12-18 1982-01-26 Hpm Corporation Method for opening die sections
US4345893A (en) * 1980-10-20 1982-08-24 Prince Corporation Molding machine
US4425091A (en) 1980-10-20 1984-01-10 Prince Corporation Molding machine
US4484874A (en) * 1981-10-23 1984-11-27 Mitsubishi Jukogyo Kabushiki Kaisha Tire vulcanizing press
US4487564A (en) * 1983-04-29 1984-12-11 Holdt J W Von Split mold lock
US4565517A (en) * 1984-01-28 1986-01-21 Hoesch Aktiengesellschaft Hydraulic press for pressing mats of plastic material reinforced with glass fibers
US4759280A (en) * 1986-12-29 1988-07-26 John T. Hepburn, Limited Hydraulic press with adjustable platen clearance
US4948359A (en) * 1987-12-11 1990-08-14 M. Yasui & Co., Ltd. Mold holding and positioning means for use with wax injector
US4822274A (en) * 1988-01-20 1989-04-18 Harry Chan Hydraulic clamping unit for a molding apparatus
WO1993000188A3 (en) * 1991-06-27 1993-04-29 Dbm Industries Ltd Die casting machine
AU656611B2 (en) * 1991-06-27 1995-02-09 Dbm Industries Limited Die casting machine
US6592360B2 (en) * 1999-12-08 2003-07-15 Nissei Plastic Industrial Co., Ltd. Mold clamping apparatus of injection molding machine
US20050287245A1 (en) * 2004-06-26 2005-12-29 Maplan Maschinen Und Technische Anlagen, Planungs- Und Fertigungs-Ges, M.B.H. Closure unit for an injection moulding device
US7435071B2 (en) * 2004-06-26 2008-10-14 Maplan Maschinen Und Technische Anlagen, Planungs-Und Fertigungs-Ges, M.B.H. Closure unit for an injection moulding device
CN100453288C (zh) * 2005-03-25 2009-01-21 鸿富锦精密工业（深圳）有限公司 模具镶件的高度调节装置

Also Published As

Publication number Publication date
FR2028188A1 (de) 1970-10-09
DE1901946A1 (de) 1972-03-02
AT298715B (de) 1972-05-25
CH511656A (de) 1971-08-31
ES375083A1 (es) 1972-04-01
JPS4817130B1 (de) 1973-05-26
GB1292343A (en) 1972-10-11

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