JPH0663954A - Mold opening and closing mechanism - Google Patents

Mold opening and closing mechanism

Info

Publication number
JPH0663954A
JPH0663954A JP24599092A JP24599092A JPH0663954A JP H0663954 A JPH0663954 A JP H0663954A JP 24599092 A JP24599092 A JP 24599092A JP 24599092 A JP24599092 A JP 24599092A JP H0663954 A JPH0663954 A JP H0663954A
Authority
JP
Japan
Prior art keywords
mold
closing
fixed
movable
opening
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.)
Withdrawn
Application number
JP24599092A
Other languages
Japanese (ja)
Inventor
Hiroshi Fujimura
Hideo Kuroda
浩史 藤村
英夫 黒田
Original Assignee
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
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 Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社 filed Critical Mitsubishi Heavy Ind Ltd
Priority to JP24599092A priority Critical patent/JPH0663954A/en
Publication of JPH0663954A publication Critical patent/JPH0663954A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • B29C2045/645Mould opening, closing or clamping devices using magnetic means

Abstract

PURPOSE:To open and close a mold with high efficiency by a relatively simple control unit and a small-sized mold opening and closing mechanism without requiring a large-sized mold opening and closing mechanism and a complicated control unit. CONSTITUTION:A electromagnetic force control means consisting of a pair of the permanent magnet 21 and electromagnet 22 capable of being changed over in magnetic pole respectively provided to a movable plate 8 and a fixed plate 7 or a movable mold 10 and a fixed mold 9 or composed of a magnet pair consisting of both electromagnets 22 and controllable in the magnitude and direction of electromagnetic force corresponding to a molding cycle and the interval between the molds is provided and the electromagnetic force superposed on the external force acting on the movable mold 10 is allowed to act.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening / closing mechanism used in an injection molding machine, and more particularly to a mold opening / closing mechanism applicable to a press die, a casting die and a die casting die.

[0002]

2. Description of the Related Art An outline of the mechanical elements and operation of a conventional hydraulic drive type injection molding machine will be described with reference to FIG. In FIG. 6, 1 is a base plate, 2 is a fastening base, 3 is a mold clamping cylinder fixed to the base plate 1 by the fastening base 2, and 4 is a high pressure from a hydraulic pump mounted in the base plate 1 to the mold clamping cylinder 3. Hydraulic conduit for feeding oil,
5 is a piston slidably inserted in the mold clamping cylinder 3, and 6 and 6'are tie bars whose one end is fixed to the mold clamping cylinder 3. Only two tie bars are shown in the drawing, Is equipped with four. 7 is a tie bar 6, 6 '
A fixed plate fixed to the other end of the tie bar 8 is a tie bar 6, 6 '.
A movable plate 9 is slidably fitted to the movable plate 9, a fixed mold 9 is fixed to the fixed plate 7, and a movable mold 10 is fixed to the movable plate 8. Further, 11 is a hydraulic cylinder fixed to the base plate 1, 12 is a piston slidably inserted in the hydraulic cylinder 11, 13 is a sliding plate fixed to the piston 12, and 14 is a sliding plate 13. The plasticizing cylinder 15 is a hydraulic cylinder also fixed to the sliding plate 13, and the piston 16 is slidably inserted into the hydraulic cylinder 11. It should be noted that the hydraulic cylinder 15 and the piston 16 are normally shown in two sets, although only one set is shown in the drawing. 17 is a pressing jig fixed to the piston 16,
18 is a screw drive motor fixed to the pressing jig 17,
Reference numeral 19 is a raw material supply hopper.

Now, when the raw material pellets are put into the raw material supply hopper 19, and a screw (not shown) is rotated in the plasticizing cylinder 14 by the screw drive motor 18,
The pellets are plasticized and accumulated as molten resin in front of the screw. On the other hand, from the hydraulic pump installed in the base 1,
When high-pressure oil is fed to the forward cylinder chamber of the mold clamping cylinder 3 through the hydraulic conduit 4, the piston 5 is pushed out, and the movable mold 10 is strongly pressed against the fixed mold 9 via the movable plate 8. In this state, when the screw is moved forward by the hydraulic cylinder 11 while the tip of the plasticizing cylinder 14 is pressed against the fixed mold 9 by the hydraulic cylinder 11 via the piston 12 and the sliding plate 13, the molten resin causes the plasticizing cylinder 14 to move. Is injected into the cavity between the fixed mold 9 and the movable mold 10 and solidified.

Next, the next step of injection molding will be described with reference to FIG. 7. In FIG. 7, reference numeral 20 is an injection molded product, but other mechanical elements are exactly the same as those in FIG. When the hydraulic pressure of the hydraulic pump installed in the base 1 is switched from the hydraulic conduit 4 to the hydraulic conduit 4'and high-pressure oil is fed to the anti-cylinder chamber of the mold clamping cylinder 3, the piston 5 is pulled in, The movable mold 10 is fixed via the movable plate 8 to the fixed mold 9.
The injection-molded article 20 can be taken out after being pulled away from. Although the mold opening / closing mechanism using hydraulic pressure has been described above, there is also an electric mold opening / closing mechanism in which an electric motor is combined with a ball screw, a link, a cam and the like.

[0005]

In order to perform injection molding efficiently, the above-mentioned plasticizing step, injection step, molded product take-out step and the like should be speeded up, but the most important one is the mold opening / closing step. It is speeding up. Since molten resin shrinks when solidified to form sink marks, in order to obtain good results in injection molding, it is necessary to hold the molded product at a pressure sufficient to offset the shrinkage during the solidification process, and the mold inevitably has to. It had to be a heavy one. Therefore, during the mold closing operation, the heavy movable mold 10 is rapidly accelerated, and is rapidly decelerated immediately before coming into contact with the fixed mold 9, and when the mold clamping pressure is maintained, the movable mold 10 is fixed to the fixed mold 9 with a large force. At the time of pressing and opening the mold, it was necessary to overcome the adhesive force of the resin and rapidly accelerate the heavy movable mold 9. Therefore, the high-efficiency injection molding machine requires a very large mold opening / closing mechanism and a complicated control device, which increases the cost of the machine and causes problems in adjustment and maintenance. The present invention has been proposed to solve the above conventional problems.

[0006]

For this reason, the present invention provides a movable platen and a fixed platen or a movable platen in a mold opening / closing mechanism including a movable platen and a fixed platen for opening and closing the movable platen using an external force. At least one pair of magnets provided in the mold and the fixed mold and capable of switching magnetic poles and an electromagnetic force adjusting means are provided to apply an electromagnetic force superposed on an external force acting on the movable mold. The pair is composed of a permanent magnet and an electromagnet, or an electromagnet, respectively, and the electromagnetic force adjusting means can adjust the magnitude and direction of the electromagnetic force according to the molding cycle and the distance x between the molds. It is a means.

[0007]

The electromagnet can change the direction and magnetic force of the magnetic poles arbitrarily by selecting the amount of current and the polarity. Therefore, if the opposing magnet surfaces are made to have the same magnetic pole during mold closing operation,
Repulsive force works. Since this repulsive force is inversely proportional to the square of the distance, the repulsive force increases rapidly when the movable mold approaches the fixed mold, and the movable mold that moves at high speed must be decelerated rapidly near the fixed mold. You can Further, at the time of mold clamping and holding pressure, if the opposing magnet surfaces are made to have different magnetic poles, a suction force works and the movable mold and the fixed mold can be brought into close contact with each other. Further, at the time of the mold opening operation, if the opposing magnet surfaces are made to have the same magnetic pole again, the repulsive force acts, so that the mold opening operation can be efficiently started.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 5 show an embodiment of the present invention, FIG. 1 is an overall side view of an injection molding machine, and FIGS. FIG. 4 is an enlarged view of the vicinity of the mold during the mold closing operation and the mold opening operation, and FIG. 5 is an enlarged view of the vicinity of the mold during mold clamping and holding pressure.
Shown in. In FIG. 1, the mechanical elements denoted by reference numerals 1 to 19 are exactly the same as those in FIG. 6, so detailed description thereof will be omitted. 1 is different from FIG. 6 in that permanent magnets 21 and 21 'are fixed to the movable plate 8 and electromagnets 22 and 22' are fixed to the fixed plate 7. Further, 23 is a switch box, 24 is a sequence control device of an injection molding machine, 2
Reference numeral 5 is a DC power source, and 26 is a variable resistor.

The operation of the embodiment shown in FIG. 1 will be described. First, during the mold closing operation, the movable mold 10 approaches the fixed mold 9 at a high speed together with the movable platen 8. At this time, the switch box 23 shown in FIG. However, if the connection shown by the solid line is made by the command of the sequence control device 24 of the injection molding machine, the electromagnets 22 and 22 'are made to face each other by the current from the DC power supply 25 as shown in FIG. Since they have the same magnetic pole as that of ′ and repel each other, the movable mold 10 can be rapidly decelerated in the vicinity of the fixed mold 9 by controlling the repulsive force with the variable resistor 26. Next, when holding the mold clamping pressure,
If the switch box 23 of No. 1 is connected as shown by the broken line in response to a command from the sequence controller 24 of the injection molding machine,
Due to the current from the DC power supply 25, the electromagnets 22 and 22 'are
As shown in FIG. 5, the permanent magnets 21 and 21 'facing each other have different magnetic poles, and the holding pressure can be increased by attracting each other.

During the mold opening operation, the switch box 23 shown in FIG. 2 is again connected by the command from the sequence controller 24 of the injection molding machine to the connection shown by the solid line. As shown in FIG. 4, ′ have the same magnetic poles as the opposing permanent magnets 21, 21 ′ and repel each other, so that the mold opening operation can be easily started. Although the example in which the permanent magnet and the electromagnet are used in the mold opening / closing control mechanism has been described above, an example in which the electromagnet is used in all the magnet pairs will be described next with reference to FIG. In FIG. 3, 22, 2
2 ', 23, 24 and 26 are the same as those in FIG. Reference numeral 25 denotes a power source, which may be a DC power source or an AC power source, and 27 and 27 'are electromagnets fixed to the movable platen 8 in FIG.

Next, the operation of the embodiment configured as described above will be described. First, during the mold closing operation, the movable mold 1
0 approaches the fixed mold 9 at a high speed together with the movable platen 8. At this time, if the switch box 23 in FIG. 3 is instructed by the sequence controller 24 of the injection molding machine to make the connection shown by the solid line, the power source 25 Current from the electromagnets 22, 22 '
Have the same magnetic poles as the opposing electromagnets 27, 27 'and repel each other. Therefore, by controlling the repulsive force with the variable resistor 26, the movable mold 10 can be rapidly decelerated in the vicinity of the fixed mold 9. . Next, when the mold clamping pressure is maintained, the switch box 23 of FIG.
If the connection is made as indicated by the broken line in accordance with the above command, the electromagnets 22 and 22 'become different magnetic poles from the opposing electromagnets 27 and 27' and attract each other by the current from the power source 25, so that the holding pressure can be increased. it can. Further, at the time of mold opening operation, if the switch box 23 of FIG. 3 is connected again by the command of the sequence control device 24 of the injection molding machine and shown by the solid line, the electromagnets 22, 22 'are caused by the current from the power supply 25.
Have the same magnetic poles as the opposing electromagnets 27 and 27 'and repel each other, so that the mold opening operation can be easily started.

[0012]

As described in detail above, according to the present invention, since precise control is possible when approaching a mold that requires delicate control and large force, a relatively simple control device and mold opening / closing mechanism can be used. A highly efficient injection molding machine can be realized, and a very large mold opening / closing mechanism and a complicated control device as in the past are not required at all.

[Brief description of drawings]

FIG. 1 is a side view showing an entire injection molding machine according to an embodiment of the present invention.

FIG. 2 is a wiring diagram showing an outline of a control circuit according to the first embodiment of the present invention.

FIG. 3 is a wiring diagram showing an outline of a control circuit according to a second embodiment of the present invention.

FIG. 4 is a side view of the mold opening / closing mechanism according to the embodiment of the present invention.

FIG. 5 is a side view of the mold opening / closing mechanism when the magnetic poles are opposite to those in FIG.

FIG. 6 is a side view showing an entire mold opening / closing mechanism in a conventional injection molding machine.

FIG. 7 is a side view showing an operating state different from that of the injection molding machine of FIG.

[Explanation of symbols] 1 base plate 2 fastening base 3 mold clamping cylinder 4 hydraulic conduit 5 piston 6,6 'tie bar 7 fixed plate 8 movable plate 9 fixed mold 10 movable mold 11 hydraulic cylinder 12 piston 13 sliding plate 14 cylinder 15 hydraulic cylinder 16 piston 17 pressing jig 18 screw drive motor 19 raw material hopper 21,21 'permanent magnet 22,22' electromagnet 23 switch box 24 sequence control device 25 DC power supply 26 variable resistor 27 electromagnet

Claims (4)

[Claims]
1. A mold opening / closing mechanism comprising a movable mold and a fixed mold for opening and closing the movable mold using an external force, wherein magnetic poles are provided on the movable plate and the fixed plate, or on the movable mold and the fixed mold, respectively. A mold opening / closing mechanism, which is provided with at least one pair of switchable magnets and an electromagnetic force adjusting means, and applies an electromagnetic force superposed on an external force acting on the movable mold.
2. The mold opening / closing mechanism according to claim 1, wherein the magnet pair comprises a permanent magnet and an electromagnet.
3. The mold opening / closing mechanism according to claim 1, wherein each pair of magnets is an electromagnet.
4. The mold opening / closing mechanism according to claim 1, wherein the electromagnetic force adjusting means is capable of adjusting the magnitude and direction of the electromagnetic force according to a gap x between the molding cycle and the mold. .
JP24599092A 1992-08-24 1992-08-24 Mold opening and closing mechanism Withdrawn JPH0663954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24599092A JPH0663954A (en) 1992-08-24 1992-08-24 Mold opening and closing mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24599092A JPH0663954A (en) 1992-08-24 1992-08-24 Mold opening and closing mechanism

Publications (1)

Publication Number Publication Date
JPH0663954A true JPH0663954A (en) 1994-03-08

Family

ID=17141831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24599092A Withdrawn JPH0663954A (en) 1992-08-24 1992-08-24 Mold opening and closing mechanism

Country Status (1)

Country Link
JP (1) JPH0663954A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807508A2 (en) * 1996-05-13 1997-11-19 MANNESMANN Aktiengesellschaft Method and apparatus for operating an injection moulding machine
US6619940B1 (en) * 2001-05-07 2003-09-16 Industrial Technology Research Institute Method and device for clamping electromagnetically molds of injection molding machine
JP2008114535A (en) * 2006-11-07 2008-05-22 Sumitomo Heavy Ind Ltd Mold clamping device
JP2013056461A (en) * 2011-09-08 2013-03-28 Sumitomo Heavy Ind Ltd Injection molding machine
KR101282750B1 (en) * 2012-01-19 2013-07-05 서강대학교산학협력단 Vibration type sheet incremental forming apparatus
KR101327752B1 (en) * 2011-10-12 2013-11-11 스미도모쥬기가이고교 가부시키가이샤 Injection molding machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0807508A2 (en) * 1996-05-13 1997-11-19 MANNESMANN Aktiengesellschaft Method and apparatus for operating an injection moulding machine
EP0807508A3 (en) * 1996-05-13 1999-05-19 MANNESMANN Aktiengesellschaft Method and apparatus for operating an injection moulding machine
US6619940B1 (en) * 2001-05-07 2003-09-16 Industrial Technology Research Institute Method and device for clamping electromagnetically molds of injection molding machine
JP2008114535A (en) * 2006-11-07 2008-05-22 Sumitomo Heavy Ind Ltd Mold clamping device
JP2013056461A (en) * 2011-09-08 2013-03-28 Sumitomo Heavy Ind Ltd Injection molding machine
KR101327752B1 (en) * 2011-10-12 2013-11-11 스미도모쥬기가이고교 가부시키가이샤 Injection molding machine
KR101282750B1 (en) * 2012-01-19 2013-07-05 서강대학교산학협력단 Vibration type sheet incremental forming apparatus

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Effective date: 19991102