US3857440A - Die casting machine - Google Patents

Die casting machine Download PDF

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Publication number
US3857440A
US3857440A US00341111A US34111173A US3857440A US 3857440 A US3857440 A US 3857440A US 00341111 A US00341111 A US 00341111A US 34111173 A US34111173 A US 34111173A US 3857440 A US3857440 A US 3857440A
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US
United States
Prior art keywords
locking force
hydraulic device
locking
casting machine
die casting
Prior art date
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
Application number
US00341111A
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English (en)
Inventor
E Ruegg
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.)
Netstal Maschinen AG
Original Assignee
Maschinenfabrik und Giesserei Netstal AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik und Giesserei Netstal AG filed Critical Maschinenfabrik und Giesserei Netstal AG
Application granted granted Critical
Publication of US3857440A publication Critical patent/US3857440A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/221—Injection mold closing and locking clamp, wedge or retention means

Definitions

  • the machine has a mold closing and locking unit including a first hydraulic device operable to move a movable mold support, guided on columns extending between a fixed supporting yoke and another mold support at the injection side, from an open position to a closed position and inversely, and a second hydraulic device operable to produce the mold locking force.
  • the first hydraulic device comprises pistons secured to the movable mold support and arranged symmetrically to the axis of movement thereof, these pistons operating in working cylinders mounted in the supporting yoke.
  • the second hydraulic device comprises a piston secured centrally to the movable mold support and operating in a non-rotatable locking force cylinder.
  • a cam ring embraces the locking force cylinder and is fixed against axial displacement thereon.
  • This cam ring has cams projecting toward the adjacent surface of the fixed supporting yoke and the cam ring is angularly adjustable between a first position, in which these cams can enter into recesses in the adjacent surface of the fixed supporting yoke, and a second position in which the cams bear against the webs separating the recesses in the adjacent surface and the fixed supporting yoke.
  • the cam ring in the second position, thus bears axially against the adjacent surface of the fixed yoke to transmit the loading of the locking force cylinder to the fixed yoke, whereby a pressure loading of the locking force cylinder produces a locking stroke, of the second hydraulic device, of only a few mm in length.
  • This invention relates to a die casting machine, and particularly to a mold closing and locking unit comprising a hydraulic device operable to move a mold support, guided on columns extending between a fixed supporting yoke and another mold support provided on the injection side, from an open position into a closed position and inversely, and a hydraulic device operable to produce the mold locking force.
  • Fully hydraulic mold closing and locking units for example, units in which the closing and opening travel of a movable mold support as well as the locking pressure are effected by means of hydraulic devices, are advantageous, particularly in large die casting machines operating with very high locking forces and large numbers of shots per minute.
  • Known machines of this type are not only complicated but frequently are not sufficiently reliable in service either. Difficulties are caused particularly by air bubbles in the pressure fluid, usually oil, and by the after-aspiration of pressure fluid as produced by the product of the piston cross sectional area, in the locking force producing device, and the respective mold stroke.
  • pressure fluid consumption and heating up often result in an uneconomical operation.
  • the invention is directed to the problem of providing a die casting machine of the mentioned type in which these difficulties are avoided and which, for example, for the movement producing the locking force, would require only a minimum stroke of a few mm while assuring an optimum economical service with a minimum of required space.
  • a die casting machine embodying the invention is designed so that the hydraulic device effecting the closing and opening travel is provided with pistons which are secured to the movable mold support and arranged symmetrically to the axis of movement thereof. These pistons operating in working cylinders mounted in a fixed supporting yoke.
  • the hydraulic device producing the locking force comprises a piston which is secured centrally to the movable mold support, and operating in a locking force cylinder.
  • the locking force cylinder is non-rotatable, and a force transmitting ring embraces this cylinder and is fixed against axial displacement thereon.
  • This ring is angularly adjustable on the locking force cylinder between a first position, in which it can be moved axially into openings in the adjacent surface of the fixed yoke, into a second position in which the ring, and thus the locking force cylinder also, bear axially adjacent the adjacent surface of the fixed supporting yoke.
  • the hydraulic rotary piston drive advantageously is provided, and the locking force piston is designed as a hollow piston through which an ejector device may operate.
  • An object of the invention is to provide a die casting machine having an improved mold closing and locking unit. Another object of the invention is to provide such a die casting machine including novel mold locking force producing means requiring only a very short locking stroke of a few mm in length.
  • a further object of the invention is to provide such a die casting machine which assures optimum economical service with a minimum of required space.
  • FIG. 1 is a side elevation view showing a part of a die casting machine comprising a fully hydraulic device for effecting the travel motion and the locking pressure;
  • FIG. 2 is a cross-sectional view taken on the line II-II of FIG. 1;
  • FIG. 3 is an axial or longitudinal sectional view of the die casting machine part shown in FIG. 1;
  • FIGS. 4 and 5 are axial sectional views illustrating details of the die casting machine part shown in FIG. 1.
  • the fully hydraulic mold closing and locking unit of the die casting machine comprises a supporting yoke 1 having columns 2 mounted thereon and serving as guides for a movable mold support 3.
  • a second mold support 4 at the injection side of the dies casting machine, is secured to the opposite ends of columns 2.
  • Two lateral cylinders 5, each cooperating with a respective piston 5b and a respective piston rod 5a, are also mounted in yoke 1.
  • Piston rods 5a are secured to movable mold support 3 by threaded engagement with nuts 6 bolted to movable mold support 3.
  • Pressure fluid is supplied to the respec tive cylinder volumes on opposite :sides of each piston 5b through inlets 7 and 8, as shown more particularly in FIGS. 4.
  • the hydraulic elements 5, 5a and 5b serve to effect the mold closing and opening travel.
  • a cam ring 12 is rotatably mounted on cylinder cover 11, and restrained against axial movement relative to cylinder 10 and cover 11.
  • Cam ring 12 can be turned by means of a rotary pistoncylinder device 13, which is mounted on cylinder cover 11.
  • a hydraulic ejector device 14 including a stroke limiting element 15 which, for ready adjustment, is accessible from the exterior through supporting yoke 1.
  • Piston 16 of ejector device 14 is formed with an axial bore extending there through.
  • Hydraulic mold closing device 9, 10, ll, 12 and 13 serves to produce the mold locking pressure.
  • Cylinder 10 is secured against rotation by means of bolts 17.
  • bolts 17 can be secured to movable mold support 3 by means of screws 18, as shown in FIG. 5.
  • screws 18 are removed so that cylinder 10 may move within the range of its strokes, and the threaded holes provided in mold support 3 are closed by appropriate stoppers.
  • guide rods 19 reciprocable in supporting yoke 1 and secured to movable mold support 3 by means of screws 20, as best seen in FIG. 5.
  • Cam ring 12 is formed with cams 21 which cooperate with recesses 22 or with force transmitting webs 23 of supporting yoke 1.
  • the facing surfaces of webs 23 and earns 21 are designated, respectively, 24 and 25.
  • cam ring 12 occupies an angular position in which the axial planes of cams 21 and of recesses 22 of supporting yoke l coincide.
  • pressure fluid is supplied through inlets 8 into lateral cylinders 5, piston rods a move mold support 3 over the travel distance H (FIG. 1) into the closing position of the mold.
  • the mold locking device is relieved through pressure fluid inlet 26.
  • pressure fluid is supplied into rotary piston-cylinder l3 and cam ring 12 is angularly adjusted so that cams 21 move out of alignment with recesses 22 and into alignment with webs 23.
  • pressure fluid is supplied into cylinder volume S through inlet 27 (FIG. 3) whereby the mold locking force is produced through the medium of tubular hollow piston 9.
  • pressure fluid in the cylinder volume R is vented through inlet 26.
  • the hydraulic mold closing and locking unit of the invention has a compact construction and its individual parts are easily accessible.
  • the unit of the present invention utilizes simple hydraulic mechanisms, with the particular advantage that the mechanism provided for producing the locking force operates with a stroke of only a few millimeters.
  • a mold closing and locking unit including a first hydraulic device operable to move a movable mold support, guided on columns extending between a supporting yoke and another mold support at the injection side, from an open position to a closed position and inversely, and a second hydraulic device operable to produce the mold locking force, with the first hydraulic device including pistons secured to the movable mold support and arranged symmetrically to the axis of movement thereof, and operating in working cylinders mounted in the supporting yoke, the improvement comprising, in combination, said second hydraulic device comprising a piston secured centrally to said movable mold support and operating in a nonrotatable locking force cylinder; four guide rods reciprocable in said supporting yoke and secured to said movable mold support to absorb the tilting moment produced by said second hydraulic device; a force transmitting ring embracing said locking force cylinder and fixed against axial displacement thereon; said ring being angularly adjustable on said locking force cylinder between a first position, in which it can
  • force transmitting ring is a cam ring having angularly spaced cams arranged to engage, in said first position, in corresponding angularly spaced recesses in said supporting yoke and, in said second position, to engage webs separating said recesses.
  • said locking force cylinder includes a closure at its end adjacent said yoke; said cam ring being mounted on said closure.
  • the improvement claimed in claim 5 including screws insertable through said bores to threadedly engage said bolts to secure said bolts to said movable mold support during an exchange of packing of said locking force cylinder; and stoppers engageable in said bores to close the outer ends of said bores upon removal of said screws.
  • said further piston has a bore extending axially therethrough and is accessible both through said movable mold support and said supporting yoke.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US00341111A 1972-03-22 1973-03-14 Die casting machine Expired - Lifetime US3857440A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH423672A CH543326A (de) 1972-03-22 1972-03-22 Spritzgiessmaschine

Publications (1)

Publication Number Publication Date
US3857440A true US3857440A (en) 1974-12-31

Family

ID=4272341

Family Applications (1)

Application Number Title Priority Date Filing Date
US00341111A Expired - Lifetime US3857440A (en) 1972-03-22 1973-03-14 Die casting machine

Country Status (8)

Country Link
US (1) US3857440A (fr)
JP (1) JPS5135450B2 (fr)
AT (1) AT335651B (fr)
CA (1) CA976724A (fr)
CH (1) CH543326A (fr)
FR (1) FR2176980B1 (fr)
GB (1) GB1383156A (fr)
IT (1) IT981491B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054406A (en) * 1975-02-06 1977-10-18 Maschinenfabrik And Giesserei Netstal Ag Hydraulic ejector operating mechanism
US4744740A (en) * 1983-08-25 1988-05-17 Technoplas, Inc. Straight-hydraulic mold clamping system in molding machine
US6106265A (en) * 1998-07-09 2000-08-22 Von Holdt; John W. Stack mold centering system
WO2008149401A1 (fr) * 2007-06-08 2008-12-11 Italpresse Industrie S.P.A. Machine à couler sous pression

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6774701B2 (ja) 2016-05-30 2020-10-28 デクセリアルズ株式会社 アンテナ装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270372A (en) * 1963-04-30 1966-09-06 Mannesmann Meer Ag Extrusion molding machine
US3669599A (en) * 1970-12-08 1972-06-13 Nat Automatic Tool Co Hydromechanical clamp
US3669593A (en) * 1970-02-10 1972-06-13 Wilhelm Cyriax Mold-closing means for molding machines
US3697212A (en) * 1970-04-24 1972-10-10 Krauss Maffei Ag Molding press

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB1014093A (en) * 1963-11-29 1965-12-22 Loewy Eng Co Ltd Mould-closing unit for injection moulding machines
SE301716B (fr) * 1967-01-19 1968-06-17 Broederna Akesson Maskinfabrik

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270372A (en) * 1963-04-30 1966-09-06 Mannesmann Meer Ag Extrusion molding machine
US3669593A (en) * 1970-02-10 1972-06-13 Wilhelm Cyriax Mold-closing means for molding machines
US3697212A (en) * 1970-04-24 1972-10-10 Krauss Maffei Ag Molding press
US3669599A (en) * 1970-12-08 1972-06-13 Nat Automatic Tool Co Hydromechanical clamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054406A (en) * 1975-02-06 1977-10-18 Maschinenfabrik And Giesserei Netstal Ag Hydraulic ejector operating mechanism
US4744740A (en) * 1983-08-25 1988-05-17 Technoplas, Inc. Straight-hydraulic mold clamping system in molding machine
US6106265A (en) * 1998-07-09 2000-08-22 Von Holdt; John W. Stack mold centering system
WO2008149401A1 (fr) * 2007-06-08 2008-12-11 Italpresse Industrie S.P.A. Machine à couler sous pression

Also Published As

Publication number Publication date
AT335651B (de) 1977-03-25
CA976724A (en) 1975-10-28
CH543326A (de) 1973-10-31
FR2176980A1 (fr) 1973-11-02
ATA230873A (de) 1976-07-15
DE2313568B2 (de) 1975-06-12
JPS4947219A (fr) 1974-05-07
IT981491B (it) 1974-10-10
FR2176980B1 (fr) 1975-10-31
JPS5135450B2 (fr) 1976-10-02
GB1383156A (en) 1975-02-05
DE2313568A1 (de) 1973-10-04

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