US3825386A - Pressing control device - Google Patents

Pressing control device Download PDF

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Publication number
US3825386A
US3825386A US00352585A US35258573A US3825386A US 3825386 A US3825386 A US 3825386A US 00352585 A US00352585 A US 00352585A US 35258573 A US35258573 A US 35258573A US 3825386 A US3825386 A US 3825386A
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US
United States
Prior art keywords
pressing
piston
adjusted
piston rod
control unit
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
US00352585A
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English (en)
Inventor
W Bello
Der Meulen W Van
P Halma
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3825386A publication Critical patent/US3825386A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/068—Drive connections, e.g. pivotal

Definitions

  • a pressing device for the pressing of synthetic resin materials in a mould comprising an hydraulic motor which is provided with a piston which is movable in a cylinder, a piston rod being connected to the said piston. Hydraulic pressing liquid can'be supplied to the spaces on both sides of this piston by means of a servo valve.
  • the piston rod is provided with a force detector and a displacement detector.
  • the signals supplied by these detectors are compared with adjusted values. As long as the pressing force remains below the adjusted value, the control unit controls the servo valve such that the piston moves at an adjusted speed. When the adjusted pressing force is reached, the control unit controls the servo valve such that the piston rod does not exceed the adjusted pressing force.
  • the invention relates to a pressing device, in particular for the pressing of synthetic resin materials in a mould, provided with an hydraulic motor which comprises a piston which is movable in a cylinder, a piston rod being connected to said piston, it being possible to supply or withdraw hydraulic pressure liquid to or from the spaces on both sides of said piston by means of a servo valve.
  • the products which are pressed of synthetic resin materials by means of suitable known pressing devices often have defects. These defects can be inter alia excessive burrs, air-inclusions, poor surface condition, poor material distribution, premature hardening etc. All these defects are an indication of insufficient control of the pressing process which in known pressing devices is controlled mainly by adjustment of the pressure difference across the piston.
  • the pressing device according to the invention is characterized in that the piston rod is provided with a force detector and a displacement detector, the signals supplied by these detectors being applied to a control unit in which these signals are compared with adjusted values, the control unit controlling the servo valve such that the piston moves at an adjusted speed as long as the pressing force remains below the adjusted value, the control unit controlling the servo valve, when the, adjusted pressing force is reached such that the piston rod does not exceed the adjusted pressing force.
  • the plunger By effecting the control in reaction to the displacement detector and by imparting to the piston a speed which corresponds to an adjusted value during the time that the pressing force is lower than the adjusted force, the plunger will introduce the material to be pressed in the mould at such a speed that the risk of air-inclusions, premature hardening and poor surface conditions is very small.
  • a further preferred embodiment of the pressing device according to the invention is characterized in that the piston rod is connected to a pressing plunger via a thrust bearing, the said thrust bearing allowing the pressing plunger some play in the transverse direction with respect to the piston rod.
  • the reference numeral 1 in the drawing denotes a cylinder. Accommodated in this cylinder is a piston 2 which is provided with a piston rod 3.
  • the cylinder 1 is supported by a plate 4, which is connected to the frame 6 of the pressing device via a number of columns 5.
  • a mould 7 Arranged on the frame 6 is a mould 7 in which one or more cavities are present in which synthetic resin material can be pressed. Pressing is effected by means of a plunger 8, the upper side of which is provided with a structural part 9 which grips about a plate 10 which is connected to the piston rod 3.
  • Part 9 and plate 10 together constitute a hydrostatic thrust bearing.
  • the plate 10 is provided with a number of pressure chambers 11 which receive liquid from the space 14in cylinder 1 via a duct 12 incorporating restrictions 13.
  • the space 14 communicates, via a duct 15, with a liquid supply duct 16 which communicates with the outlet side of a liquid pump 17.
  • the liquid pump is driven by an electric motor 18 and derives its liquid from liquid reservoir 19.
  • the space 21 cancommunicate, via duct 22 and servo valve 20, with the liquid supply duct l6'or with the liquid outlet duct 25. Liquid from the bearing chambers 11 of the hydrostatic bearing can reach outlet duct 25 via duct 24.
  • the plunger 8 is provided with a force detector 30 which supplies its signal to control unit 31. Also provided is a displacement detector 32 which detects the displacement of the piston rod 2 and which applies a corresponding signal to the control unit 31.
  • the control unit 31 controls the control unit 33 of the servo valve 20.
  • the displacement of piston 2 is detected by displacement detector 32, whilst the delivered pressing force is measured by the pressure detector 30.
  • the measured values are compared in the control unit 31 with adjusted values, the control unit 31 comparing the value measured by the displacement detector 32 with the adjusted desired piston speed when the force measured by the pressure detector 30 is below the adjusted value. Any difference between adjusted and measured value produces a signal which is applied to the control unit 33 which adjusts the control valve 20 so that the supply of liquid to the space 21 is changed such that'the desired piston speed is obtained.
  • the control unit 31 switches over from speed control to force control, the signal of pressure detector 30 then being compared with the adjusted pressing force, and any difference producing a signal by means of which the control unit of the servo valve 20 is controlled such that the liquid flow applied to the space 21 is so large that the adjusted value of the pressing force is exactly maintained. If the speed increases beyond a given value again, a change-over takes place to speed control.
  • the pressure in the mould can also be used as an control quantity in given circumstances.
  • a pressing device is thus obtained in which the pressing process can be very well controlled. Control is effected in reaction to signals which are measured very near to the synthetic resin mass on which the process is performed. This means that very few secondary effects such as, for example, friction of piston 2 in cylinder 1 etc. can adversely influence the measurement.
  • the force and displacement detectors, the control unit and the servo valve are only diagrammatically shown, but a variety of types which are known to those skilled in the art can be used for these purposes. Of importance is only that the piston displacement can be controlled both as regards speed and force.
  • Apressing device in particular for the pressing of synthetic resin materials in a mould, provided with an hydraulic motor which comprises a piston which is movable in a cylinder, a piston rod being connected to said piston, it being possible to supply or withdrawn pressure liquid to or from the spaces on both sides of said piston by means of a servo valve, characterized in that the piston rod is provided with a force detector and a displacement detector, the signals supplied by these detectors being applied to a control unit in which these signals are compared with adjusted values, the control unit controlling the servo valve such that the piston moves at an adjusted speed as long as the pressing force remains below the adjusted value, the control unit controlling the servo valve, when the said pressing force is reached, such that the piston rod does not exceed the adjusted pressing force.
  • a pressing device as claimed in claim 1 characterized in that the piston rod is connected, via a thrust bearing, to a pressing plunger, the said thrust bearing allowing the pressing plunger some play in the transverse direction with respect to the piston rod.
  • Claim 2 The pressing device as claimed in Claim 1, further comprising a pressing plunger and a thrust bearing connecting said pressing plunger to said piston rod, said thrust bearing allowing the pressing plunger some play in the transverse direction with respect to the piston rod.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US00352585A 1972-05-25 1973-04-19 Pressing control device Expired - Lifetime US3825386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7207024A NL7207024A (xx) 1972-05-25 1972-05-25

Publications (1)

Publication Number Publication Date
US3825386A true US3825386A (en) 1974-07-23

Family

ID=19816116

Family Applications (1)

Application Number Title Priority Date Filing Date
US00352585A Expired - Lifetime US3825386A (en) 1972-05-25 1973-04-19 Pressing control device

Country Status (6)

Country Link
US (1) US3825386A (xx)
JP (1) JPS4943272A (xx)
DE (1) DE2324839A1 (xx)
FR (1) FR2185500B1 (xx)
GB (1) GB1417799A (xx)
NL (1) NL7207024A (xx)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885899A (en) * 1974-08-05 1975-05-27 Ford Motor Co Apparatus for expanding a laminating interlayer
US4038004A (en) * 1974-08-07 1977-07-26 Bucher-Guyer Ag Maschinenfabrik Measurement apparatus for determining the degree of filling of a casting mold
US4049762A (en) * 1973-08-03 1977-09-20 Harsco Corporation Method of forming a pipe coupling
US4060362A (en) * 1975-05-12 1977-11-29 International Business Machines Corporation Injection molding same cycle control
US4317649A (en) * 1980-05-12 1982-03-02 Per-Fil Industries Pellet molding apparatus
US4335063A (en) * 1978-06-13 1982-06-15 Werner & Pfleiderer Method and apparatus for pressure control in a press
DE3207242A1 (de) * 1981-02-24 1982-09-23 MTS Systems Corp., 55344 Eden Prairie, Minn. "hydraulische presse"
US4458189A (en) * 1982-08-06 1984-07-03 Mts Systems Corporation Control mode switching circuit
US4457684A (en) * 1981-02-24 1984-07-03 Mts Systems Corporation Hydraulic press
US4470787A (en) * 1983-05-11 1984-09-11 Mts Systems Corporation Hydraulic press
US4594065A (en) * 1983-09-02 1986-06-10 U.S. Philips Corporation Drive control apparatus for an injection-molding machine
DE3802761A1 (de) * 1988-01-30 1989-08-10 Krupp Gmbh Hydraulische presse
US4942004A (en) * 1988-11-01 1990-07-17 Cincinnati Milacron Inc. Method and apparatus for regulating mold clamping force in an injection molding machine
US4943400A (en) * 1986-01-17 1990-07-24 Data Card Japan Ltd. Method of manufacturing printing and embossing type elements
US4966538A (en) * 1988-06-01 1990-10-30 Buehler, Ltd. Mounting press
US5002475A (en) * 1988-10-04 1991-03-26 Intellex Corporation Reaction injection molding apparatus
US5039294A (en) * 1988-05-31 1991-08-13 L'oreal Apparatus for compacting powder
US5071603A (en) * 1987-12-14 1991-12-10 Kabushiki Kaisha Kobe Seiko Sho Method of controlling hydraulic press
US5141682A (en) * 1988-09-26 1992-08-25 Engel Maschinebau Gesellschaft M.B.H. Injection molding process with pressure increasing mechanism
US20120227825A1 (en) * 2011-03-07 2012-09-13 Krones Ag Method and device for recycling compressed gas

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119859B2 (xx) * 1972-03-25 1976-06-21
JPS5121276A (ja) * 1974-08-15 1976-02-20 Mitsubishi Steel Mfg Yuatsushikitotsugurupuresuniokeru kafukaboshihoho oyobi sochi
JPS537884A (en) * 1976-07-09 1978-01-24 Serugeebuitsuchi Guri Anatorii Overrpressure preventing device for use in press
DE2825253A1 (de) * 1978-06-08 1979-12-13 Nitrochemie Gmbh Hydraulische pulverpresse
CH660631A5 (de) * 1983-02-28 1987-05-15 Fischer Ag Georg Verfahren zur messung von formstoffeigenschaften, ein mittel zu dessen ausfuehrung und eine anwendung des verfahrens.
FR2566697B1 (fr) * 1984-06-27 1986-11-28 Inoplast Sa Procede et appareillage pour le controle du cycle operatoire dans la fabrication de pieces en matiere synthetique suivant le systeme de moulage par compression
GB2163383A (en) * 1984-08-22 1986-02-26 Saret Method and machine for manufacturing bricks of compressed earth
US4945742A (en) * 1987-08-27 1990-08-07 The Minster Machine Company Monitorable and compensatable feedback tool and control system for a press
US4939918A (en) * 1987-08-27 1990-07-10 The Minster Machine Company Monitorable and compensatable feedback tool and control system for a press
DE3805004C2 (de) * 1988-02-18 1996-10-31 Erfurt Umformtechnik Gmbh Einrichtung zum Abbremsen des Stößels einer hydraulischen Presse
FR2638118A1 (fr) * 1988-10-20 1990-04-27 Adl Automation Procede et appareil pour la compression et le controle de la compression de matieres pulverulentes et presse en faisant application
MX2015009744A (es) 2013-01-29 2015-11-06 Daihachi Chem Ind Agente retardante de flama para resinas, composicion de resina retardante a la flama que contiene el mismo, y metodo para producir compuesto organofosforado.
WO2016104263A1 (ja) * 2014-12-24 2016-06-30 大八化学工業株式会社 難燃剤およびそれを含有する難燃性樹脂組成物
KR102604622B1 (ko) 2017-11-10 2023-11-22 다이하치 카가쿠 고교 가부시키가이샤 난연성 조성물 및 난연성 조성물을 함유하는 난연성 열가소성 수지 조성물
EP3587010A1 (de) 2018-06-26 2020-01-01 MTH GbR Markus und Thomas Hiestand Spanneinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441925A (en) * 1944-11-09 1948-05-18 Oilgear Co Centering device
US2983956A (en) * 1958-03-13 1961-05-16 Essex Wire Corp Injection molding machine
US3509595A (en) * 1964-12-14 1970-05-05 Phillips Petroleum Co Tension control of running thermoplastic filaments
US3749535A (en) * 1971-10-14 1973-07-31 Conwed Corp Apparatus for extrusion of plastic net

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1511159A (fr) * 1966-12-19 1968-01-26 Sp Kb Uralchermetavtomatika Régulateur de la vitesse du piston-plongeur dans le filage sur presse hydraulique
FR1539204A (fr) * 1967-08-03 1968-09-13 Plastimonde Perfectionnements au procédé de moulage des matières plastiques par aménagement du contrôle des opérations de déplacement du moule et du piston d'injection
US3564883A (en) * 1968-07-30 1971-02-23 Cincinnati Shaper Co Hydraulic press control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441925A (en) * 1944-11-09 1948-05-18 Oilgear Co Centering device
US2983956A (en) * 1958-03-13 1961-05-16 Essex Wire Corp Injection molding machine
US3509595A (en) * 1964-12-14 1970-05-05 Phillips Petroleum Co Tension control of running thermoplastic filaments
US3749535A (en) * 1971-10-14 1973-07-31 Conwed Corp Apparatus for extrusion of plastic net

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049762A (en) * 1973-08-03 1977-09-20 Harsco Corporation Method of forming a pipe coupling
US3885899A (en) * 1974-08-05 1975-05-27 Ford Motor Co Apparatus for expanding a laminating interlayer
US4038004A (en) * 1974-08-07 1977-07-26 Bucher-Guyer Ag Maschinenfabrik Measurement apparatus for determining the degree of filling of a casting mold
US4060362A (en) * 1975-05-12 1977-11-29 International Business Machines Corporation Injection molding same cycle control
US4335063A (en) * 1978-06-13 1982-06-15 Werner & Pfleiderer Method and apparatus for pressure control in a press
US4317649A (en) * 1980-05-12 1982-03-02 Per-Fil Industries Pellet molding apparatus
DE3207242A1 (de) * 1981-02-24 1982-09-23 MTS Systems Corp., 55344 Eden Prairie, Minn. "hydraulische presse"
US4457684A (en) * 1981-02-24 1984-07-03 Mts Systems Corporation Hydraulic press
US4458189A (en) * 1982-08-06 1984-07-03 Mts Systems Corporation Control mode switching circuit
US4470787A (en) * 1983-05-11 1984-09-11 Mts Systems Corporation Hydraulic press
US4594065A (en) * 1983-09-02 1986-06-10 U.S. Philips Corporation Drive control apparatus for an injection-molding machine
US4943400A (en) * 1986-01-17 1990-07-24 Data Card Japan Ltd. Method of manufacturing printing and embossing type elements
US5071603A (en) * 1987-12-14 1991-12-10 Kabushiki Kaisha Kobe Seiko Sho Method of controlling hydraulic press
DE3802761A1 (de) * 1988-01-30 1989-08-10 Krupp Gmbh Hydraulische presse
US4954068A (en) * 1988-01-30 1990-09-04 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Hydraulic press
US4954067A (en) * 1988-01-30 1990-09-04 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Hydraulic press
US5039294A (en) * 1988-05-31 1991-08-13 L'oreal Apparatus for compacting powder
US4966538A (en) * 1988-06-01 1990-10-30 Buehler, Ltd. Mounting press
US5141682A (en) * 1988-09-26 1992-08-25 Engel Maschinebau Gesellschaft M.B.H. Injection molding process with pressure increasing mechanism
US5002475A (en) * 1988-10-04 1991-03-26 Intellex Corporation Reaction injection molding apparatus
US4942004A (en) * 1988-11-01 1990-07-17 Cincinnati Milacron Inc. Method and apparatus for regulating mold clamping force in an injection molding machine
US20120227825A1 (en) * 2011-03-07 2012-09-13 Krones Ag Method and device for recycling compressed gas
US8894910B2 (en) * 2011-03-07 2014-11-25 Krones Ag Method and device for recycling compressed gas

Also Published As

Publication number Publication date
DE2324839A1 (de) 1973-12-06
FR2185500A1 (xx) 1974-01-04
JPS4943272A (xx) 1974-04-23
GB1417799A (en) 1975-12-17
FR2185500B1 (xx) 1978-11-03
NL7207024A (xx) 1973-11-27

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