JPH0911299A - Mold stop positioning apparatus for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold stop positioning apparatus for an injection molding machine eliminating the complication of the vicinity of a movable board and avoiding a narrow space even if a mechanical safety unit is provided on the side or upper surface of the board. SOLUTION: The mold stop positioning apparatus for an injection molding machine comprises a male threaded part 31 provided to be extended to one end of a stopper rod, a positioning cylinder 14 for stopping the advancing of a movable board 10 fixed to the extension of the part 31 of a stationary board 13, a rod 16 mounted at the piston 15 of the cylinder 14, and a hydraulic unit for extracting hydraulic oil from the cylinder 14 for narrowing the predetermined gap as the board for compressing is advanced after the rod 16 is brought into contact with the end of the part 21 as the board 10 is advanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die stop positioning device for an injection compression molding machine.

[0002]

2. Description of the Related Art Conventionally, in injection compression molding, it has been performed to stop a movable mold in advance at a mold opening amount required for compression before injecting a molten resin into a cavity. When the injection of the molten resin was performed, the mold stop position that secured the bending angle was pushed back by the resin pressure or the like, and the amount of mold opening required for different compression depending on the resin could not be secured.

For this reason, there are many known die stop position devices that prevent the position of the stopped movable die from changing even if the position of the stopped movable die is injected into the cavity. A conventional mold stop position device will be described with reference to FIGS. 3 and 4. Reference numeral 10 denotes a movable platen to which a movable mold 11 is attached, which is moved by a mold clamping cylinder 22 with respect to a fixed platen 13 to which a fixed die 12 is attached. ing.

Reference numeral 14 is a single-acting positioning cylinder, in which a rod 16 mounted on a piston 15 slidably fitted on an inner diameter surface is shown by a chain line. When it acts on, it is designed to project to the movable platen 10 side. Reference numeral 18 denotes an adjusting bar having a male screw on the outer periphery, which is provided so as to face the tip of the rod 16 and is screwed in a cantilever state to a support 19 attached to the side surface of the movable plate 10 so as to move in the axial direction. The length can be adjusted, and the length L of the rod projected from the mold mounting surface A of the movable plate 10 can be adjusted.

A support base 20 is attached to the upper surface of the movable plate 10. One end of the support base 20 is screwed into the support base 20 in a cantilever state, and the other end has one or more concave grooves 21 formed at one end. ,
A round rod-shaped stopper rod 24 passing through a through hole of a stopper block 23 attached to the mold clamping cylinder 22 is provided. It is rotatably attached to the stopper block 23 by a pin, falls into the concave groove 21 of the stopper rod 24 by gravity, and by the cam 26 attached to the safety door 25,
A stopper arm 27 that lifts from the groove 21 of the stopper rod 24 is provided.

With this construction, when the safety door 25 is closed (moved to the left in the drawing) in injection compression molding, the stopper arm 27 is disengaged from the cam 26 of the safety door 25 and the stopper rod 24 is moved. When lifted from the groove 21 of the hydraulic pressure source 1, first, in order to secure a predetermined mold opening amount δ, the hydraulic pressure source 1
When the pressure oil from 7 is applied to the positioning cylinder 14 to project the rod 16 toward the movable platen 10 and then the mold is clamped and the movable platen 10 is moved forward (moved to the left in the figure), the movable mold 11 is moved. When approaching the mating fixed mold 12 and the mold opening amount becomes δ, the adjusting bar 18 collides with the rod 16 and even if the movable platen 10 is kept in the forward state as it is, the adjusting bar 18
Is in contact with the rod 16, the movable platen 10 does not advance any further, and the mold has a predetermined mold opening amount δ. In this state, the molten resin is injected from the injection side into the cavity. However, since the movable platen 10 is pushed by the fixed platen 13, it is not pushed back by the resin pressure in the cavity, and the mold opening amount δ does not change.

[0007]

However, as mentioned above, a mechanical safety device is attached to the side surface or the upper surface of the movable plate, and in addition to this, attaching the die stop positioning device complicates the vicinity of the movable plate. Narrow in space,
It interfered with the molding operation. The object of the present invention is to eliminate the above-mentioned drawbacks and to provide an injection compression molding machine in which the vicinity of the movable plate is not complicated and the space is not narrowed even if there is a mechanical safety device on the side surface or the upper surface of the movable plate. To provide a die stop positioning device.

[0008]

In order to achieve the above-mentioned object, the present invention has one end attached to a support provided on the side surface of a movable plate so that the length in the axial direction can be adjusted, and the other end is one or more. And a round bar-shaped stopper rod that passes through the through hole of the stopper block attached to the mold clamping cylinder.
It is rotatably attached to the stopper block with a pin,
When the safety door opens, it falls into the groove of the stopper rod,
It has a mechanical safety device that has a stopper arm that is lifted from the concave groove by the closing operation, and keeps the mold clamping pressure low.
The injection compression molding machine that performs high-pressure mold clamping after injecting the molten resin into the mold cavity while maintaining a fixed gap between the fixed mold provided on the fixed plate and the movable mold provided on the movable plate. In the die stop / positioning device, the male screw portion extended to one end of the stopper rod and the extension of the male screw portion of the fixed plate are fixed, and hydraulic pressure acts only in a direction that prevents the movable plate from advancing. A positioning cylinder consisting of a single-acting cylinder, a rod attached to a piston fitted in the positioning cylinder so as to move forward and backward, and a movable plate for compression after the rod comes into contact with the tip of the male screw part when the movable plate advances. A die stop positioning device for an injection molding machine, comprising a hydraulic control device for draining pressure oil from a positioning cylinder for narrowing the fixed gap as the board advances.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to FIGS. In the description, the same members as those of the conventional apparatus are designated by the same reference numerals, the description thereof will be omitted, and only the members newly added by the present invention will be designated by the new numbers for the description. 30 is a stopper rod having an external thread portion 31 at one end and one or a plurality of recessed grooves 21 at the other end. The male screw portion 31 at one end is a support 19 provided on a side surface of the movable plate 10.
The axial length of the positioning cylinder 1 is adjustable and the tip of the positioning cylinder 1 is mounted on the fixed platen 13.
It faces the piston rod 16 of No. 4.

A stopper arm 27 is rotatably attached to the stopper block 23 when the safety door 25 is open in the one or more concave grooves 21 at the other end.
When the safety door 25 is closed, the stopper arm 27 is disengaged from the concave groove 21 by the cam 26 provided on the safety door 25 to prevent the movable platen from moving forward so that the die cannot be clamped. It becomes possible to move the movable platen 10 forward.

Since the structure is as described above, as described in the above-mentioned conventional example, first, the pressure oil from the hydraulic pressure source 17 is applied to the positioning cylinder 14 in order to secure the predetermined mold opening amount δ. When the movable mold 11 approaches the mating fixed mold 12 and the mold opening amount becomes δ, when the movable mold 11 is moved forward, the rod 16 is projected toward the movable platen 10 side, then the mold is clamped, and the movable platen 10 is moved forward. Male screw part 31 of stopper rod 30
Even if the tip of the rod abuts against the rod 16 and the movable platen 10 is kept in the advanced state as it is, the tip of the male screw part 31 is in contact with the rod 16 and the movable platen 10 does not move any further. A predetermined mold opening amount δ is secured, and even if molten resin is injected into the cavity from the injection side in this state, the movable platen 10 is pushed by the fixed platen 13, so that the resin pressure in the cavity is pressed. Therefore, the mold opening amount δ does not change.

[0012]

As described above, according to the present invention, even if a mechanical safety device and a die stop positioning device are attached to the side surface or the upper surface of the movable plate, the vicinity of the movable plate is not complicated and space is limited. It doesn't become narrow.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a view on arrow Y of FIG.

FIG. 3 is a diagram illustrating a conventional die stop position device.

FIG. 4 is a view on arrow Z of FIG.

[Explanation of symbols]

 10 Movable Plate 11 Movable Type 12 Fixed Type 13 Fixed Plate 14 Positioning Cylinder 15 Piston 16 Rod 17 Hydraulic Source 18 Adjusting Bar 19 Support 20 Support Stand 21 Recessed Groove 22 Mold Clamping Cylinder 23 Stopper Block 24 Stopper Bar 25 Safety Door 26 Cam 27 Stopper Arm 28 Hydraulic control device 30 Stopper rod 31 Male screw

Claims (1)

[Claims] 1. A stopper block, one end of which is attached to a support provided on a side surface of a movable plate so that the length in the axial direction can be adjusted, and the other end of which is provided with one or a plurality of concave grooves, and which is attached to a mold clamping cylinder. A round rod-shaped stopper rod that passes through the through hole and is rotatably attached to the stopper block with a pin. When the safety door is opened, it is dropped into the groove of the stopper rod, and when it is closed, it is held from the groove. It has a mechanical safety device that has a rising stopper arm, keeps the mold clamping pressure low, and creates a certain gap between the fixed mold provided on the fixed plate and the movable mold provided on the movable plate. In a mold stop positioning device of an injection compression molding machine that performs high-pressure mold clamping after injecting molten resin into the mold cavity while maintaining it, a male screw portion extended to one end of the stopper rod and the fixing plate. Fixed on the extension of the male screw part of A positioning cylinder composed of a single-acting cylinder in which hydraulic pressure acts only in a direction to prevent the moving platen from moving forward, a rod attached to a piston fitted in the positioning cylinder so as to move back and forth, and the rod and the male member caused by the moving platen moving forward. A mold for an injection compression molding machine, comprising a hydraulic control device for draining pressure oil from a positioning cylinder for narrowing the fixed gap as the movable platen for compression moves forward after abutting the tip of the screw portion. Stop positioning device.