JPS5557439A - Automatic pressure reducing method - Google Patents

Automatic pressure reducing method

Info

Publication number
JPS5557439A
JPS5557439A JP13117678A JP13117678A JPS5557439A JP S5557439 A JPS5557439 A JP S5557439A JP 13117678 A JP13117678 A JP 13117678A JP 13117678 A JP13117678 A JP 13117678A JP S5557439 A JPS5557439 A JP S5557439A
Authority
JP
Japan
Prior art keywords
pressure
value
signal
reducing
electric signal
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.)
Granted
Application number
JP13117678A
Other languages
Japanese (ja)
Other versions
JPS6255964B2 (en
Inventor
Shigeru Fujita
Tadatoshi Sone
Kiyokazu Kayanuma
Hideo Sakanishi
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.)
Shibaura Machine Co Ltd
Original Assignee
Toshiba Machine Co Ltd
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 Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
Priority to JP13117678A priority Critical patent/JPS5557439A/en
Publication of JPS5557439A publication Critical patent/JPS5557439A/en
Publication of JPS6255964B2 publication Critical patent/JPS6255964B2/ja
Granted legal-status Critical Current

Links

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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material

Abstract

PURPOSE:To prevent bad effect on moldings on account of measuring variances by reducing pressure little by little when reducing pressure in each process of an injection molding machine. CONSTITUTION:A pressure setting device 15 which sets a required pressure value arbitrarily as an electric signal is provided, and in parallel to this pressure setting device 15, a pressure reducing function setting device 17 which sets arbitrarily a pressure reducing function to reduce a set pressure value to a specified pressure value as an electric signal is provided. Further, an operation circuit 18 which calculates a position to begin reducing pressure from the signals of the two setting devices and gives a position signal as an electric signal is provided and calculates a position where the pressure of a hydraulic cylinder 13 is begun to be reduced and inputs s signal to a comparatot 19. The comparator 19 compares a value from a potentiometer 14 with the value from the operation circuit 18, and when both values coincide, it operates a signal changer 20 which changes over the signals from the pressure setting devices 15 and 17 and operates a proportional pressure adjusting valve 16.
JP13117678A 1978-10-26 1978-10-26 Automatic pressure reducing method Granted JPS5557439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13117678A JPS5557439A (en) 1978-10-26 1978-10-26 Automatic pressure reducing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13117678A JPS5557439A (en) 1978-10-26 1978-10-26 Automatic pressure reducing method

Publications (2)

Publication Number Publication Date
JPS5557439A true JPS5557439A (en) 1980-04-28
JPS6255964B2 JPS6255964B2 (en) 1987-11-24

Family

ID=15051774

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13117678A Granted JPS5557439A (en) 1978-10-26 1978-10-26 Automatic pressure reducing method

Country Status (1)

Country Link
JP (1) JPS5557439A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220818A (en) * 1985-03-28 1986-10-01 Fanuc Ltd Injection molding machine indicating measuring and kneading condition by graph
EP0615834A1 (en) * 1993-03-15 1994-09-21 Sumitomo Wiring Systems, Ltd. Molded part of thermoplastic resin and method of fabricating same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220818A (en) * 1985-03-28 1986-10-01 Fanuc Ltd Injection molding machine indicating measuring and kneading condition by graph
JPH0414615B2 (en) * 1985-03-28 1992-03-13 Fanuc Ltd
EP0615834A1 (en) * 1993-03-15 1994-09-21 Sumitomo Wiring Systems, Ltd. Molded part of thermoplastic resin and method of fabricating same

Also Published As

Publication number Publication date
JPS6255964B2 (en) 1987-11-24

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