JPS5940127Y2 - Movable core actuator - Google Patents

Description

[Detailed description of the invention] Technological classification/field> The disclosed technology belongs to a technology in which a movable core provided in a mold for injection molding or the like is moved forward and backward as quickly as possible by an attached actuator.

<Summary of the gist> Therefore, in this invention, a movable mold opens and closes with respect to a fixed mold to close the mold, and a movable core slides on a guide fixed to the side wall of the movable mold of the mold that opens the mold. This invention relates to a movable core actuating device that is linked to a cylinder of an actuator that is also fixed to the side wall of the movable mold so as to move forward and backward with respect to the mold in a direction different from the opening and closing direction thereof, such as at right angles, and in particular,
The rack engraved on the outer operating bar of the movable core is parallel to another rack similarly provided on the movable side wall, and the pinion engaged with both racks is the rod end of the hydraulic cylinder of the actuator fixed to the side wall. This invention relates to a movable core actuating device that is connected to a movable core actuator.

<Prior art> As is well known, molded products such as die-cast bottom shapes and plastic injection S4 molded products are widely used in various fields, but many of these molded products have hollow parts, making it difficult to mold products. Often uses a mold with a core set.

Therefore, in mold casting, it is common to clamp the movable mold against the fixed mold and perform pouring molding, and then open the mold to take out the molded product. Molds equipped with a movable core that allows the core to move out of the set movable mold, making it smooth and easy to take out the product after opening the mold, and improving efficiency, have come into use.

In such an embodiment, the movable core is moved out in a direction that is different, for example, by 90' from the opening/closing direction of the movable mold due to design, setting conditions for the core in the molded product, restrictions on pouring, etc. As a result, the mold size becomes large and the overhang is large, making it extremely difficult to perform various operations related to the bottom shape, and it is also cumbersome when changing the mold. There are disadvantages associated with it, and in addition,
There were inconveniences such as the occupied space becoming larger.

Furthermore, the movable core may be operated by being directly connected to a hydraulic cylinder of an actuator that moves the movable core forward or backward, or an inclined pin,
There are also methods such as using a cam, but in any case, since the operation of the drive device is directly used, the movement speed is at or below the operating speed of the drive device, so it is difficult to pull out the movable core. In particular, in the case of a movable core with a large stroke, there was a problem that the molding cycle of the molded product was delayed.

Purpose of this invention The purpose of this invention is to solve the problem of advancing and retracting the movable core of a mold having a movable core based on the above-mentioned conventional technology, and to It is an object of the present invention to provide an excellent movable core actuating device which is capable of increasing speed by providing a mechanism, has a compact mechanism section, and can reduce the size of a mold.

<Structure of the invention> In accordance with the above-mentioned purpose, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is that after the mold is clamped and a predetermined molding is performed in the mold, the hydraulic cylinder of the actuator of the movable side wall is activated. The pinion provided at the tip of the rod engages with the guide rack and rotates, and also engages with the rack of the operating bar behind the movable core, causing the movable core to operate the hydraulic cylinder of the actuator. The movable mold is pulled out from the movable mold at twice the speed, so the movable mold immediately opens the mold and the molded product is removed from the mold, and this operation is reversed to reset the movable core and clamp the mold. Technical measures have been taken to make the mold size extremely compact.

<Embodiment - Configuration> Next, one embodiment of this invention will be described below based on the drawings.

Reference numeral 1 denotes a movable core actuating device that embodies the gist of this invention, and is attached to a side wall of a movable mold 3 of an injection mold 2, for example.

The movable mold 3 has a cavity 4 formed therein, and is 1. Open and close at right angles, open the mold,
The mold is clamped, and a movable core 6 having a predetermined shape is held in a predetermined attitude with respect to the cavity 4 in an advance/retreat hole 5 which is bored in a predetermined portion of the movable mold 3 and is provided at right angles to the opening/closing direction. It is possible to move forward and backward, and its stroke operation is a movable type 3
The movable mold 3 is slid on a guide 7 extending perpendicularly to the opening/closing direction of the movable mold 3.

Further, an operating bar 6 is provided integrally and externally on the movable core 6.
A rack 8 is carved on the side surface of '.

Further, a guide rack 9 is fixed to the side wall of the movable mold 3 and extends in the same direction as the rack 8 on the side of the external operating bar 6', and the guide rack 9 and the external operating bar are connected. 6
A pinion 10 is interposed between the rack 8 and the rack 8.

Further, the pinion 10 is connected to the tip of a rod 12 of a hydraulic cylinder 11 of an actuator which is also fixed to the side wall of the movable mold 3.

The hydraulic cylinder 11 is connected to the hydraulic cable 13°13.
' It is connected to a predetermined pressure oil supply/discharge device 15 which is connected to a control device 14 as appropriate.

<Embodiment - Effect> In the above-described configuration, a predetermined amount of molten metal is poured into the cavity 4 in the state shown in FIG. A predetermined molded product is molded using the core 6.

Then, when the solidification of the molded product is complete, the pressure oil supply/discharge device 15 operates under the control of the control device 14 to push the hydraulic cylinder 11 and push the pinion 10 via the rod 12. .

Therefore, the pinion 10 is restrained by the fixed guide rack 9 and rotates as shown by the arrow in FIG. As a result, the movable core 6 is pulled out of the molded product in the cavity 4 at a speed twice as fast as the outward movement speed of the hydraulic cylinder 11, ie, the pinion 10, and exits from the reciprocating hole 5.

Next, the movable mold 3 is opened, the product is taken out, the mold is clamped again, and when the hydraulic cylinder 11 retracts, the pinion 10
The movable core 6 rotates in the reverse direction as indicated by the arrow in FIG. 1, and the movable core 6 enters the cavity 4 again to be reset.

In this way, molding, movable core extraction, mold opening, product removal, mold clamping, movable core resetting, and pouring are recycled.

During operation, the movable core 6 is extracted and reset extremely quickly, so that the product extraction molding cycle is quickly performed.

Also, since the size of the hydraulic cylinder is small, work such as changing the model can be done smoothly and without any hassle.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiments; for example, the mold may be a die-casting mold, and the movable core may also not move forward and backward at right angles to the mold opening direction. Many different embodiments are possible.

<Effects of the invention> As described above, according to this invention, in a mold having a movable mold with respect to a fixed mold, a movable core that advances and retreats in a direction different from the opening/closing direction of the movable mold made of molding is moved by a guide provided on the side wall of the movable mold. The rack carved on the outer actuating bar and the guide rack provided parallel to the guide are engaged via a pinion, and the pinion engages with the actuator provided on the movable side wall. By linking to the hydraulic cylinder, the movable core can basically move forward and backward at twice the speed of conventional molds using a pinion and double rack mechanism. Product removal can be done extremely quickly, and the barrier is
The excellent effects of shortening the bottom cycle and significantly improving molding efficiency are achieved.

In addition, the pinion rattling function shortens the stroke of the pinion, making it possible to halve the size of the actuator's hydraulic cylinder. Therefore, the size of the mold is simply smaller, and the opening and closing time due to the bottom shape is reduced. This not only makes it easier to carry out various operations, but also improves the workability when changing the model, occupies less space, and has the advantage of reducing costs by downsizing the mechanical parts.

Furthermore, since the rods, pinions, etc. of the hydraulic cylinder of the movable core actuator are all movable in the same direction - on a straight line, the arrangement of the mechanical parts is simple and maintenance is easy.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; FIG. 1 is a plan view of the movable core in its advanced state, and FIG. 2 is a plan view of the movable core in its retracted state. 2... Mold, 7... Guide, 4...
...Cavity, 6...Movable core, 1...
...Movable core working device, 6'... Extended operation bar, 8... Rack, 9... Guide rack, 11°°°°° actuator cylinder, 12・
...Rod, 10...Pinion

Claims (1)

[Scope of utility model registration request] A cylinder of an actuator provided on the side wall of the mold includes a movable core that is slidable on a guide attached to the side wall of the mold and moves forward and backward in a direction different from the opening and closing direction of the mold to face the cavity of the mold. In the movable core actuating device linked to the movable core, a rack is engraved on an externally extending operating bar integrally provided on the side surface of the movable core in the advancing and retracting direction, and a guide rack extending on the side wall of the mold is provided with a rack. A pinion parallel to the rack of the actuating bar and attached to the rod of the hydraulic cylinder of the actuator provided on the side wall of the mold engages with both the rack and the guide rack. Movable core actuator.