JPS5945110A - Mold release device of plastic molding - Google Patents

Abstract

PURPOSE:To facilitate a molding to be released from molds by an air ejector in the molds for a bottomed cylindrical molding in which the axial line of the molding cavity is horizontal. CONSTITUTION:When a male mold 2 is moved to the left to open molds, compressed air has been already ejected from the 1st mold releasing device 6, a molding (a) is released from the cavity surface of a female mold 1 and is left on the side of the male mold 2. Then, in the stage when the molds are opened at a high speed or the stages before and after the opening of molds at a slow speed, the compressed air is ejected from the 2nd mold releasing device 7, the bottom of the molding (a) on the male mold 2 is released from the male mold 2, at the same time or a little later the compressed air is ejected from the 3rd mold releasing device 8 to release the barrel of the molded (a) from the molds. Moreover, when the molding (a) is ejected out by the air about 10mm. toward the front of the male mold 2 to be released from the molds, the compressed air is ejected by the upper and lower sides around the mouth edge portion of the molding (a) from compressed air nozzles 9, 10 to the mouth edge of the molding (a) and then to the clearance between the cavity surface of the male mold 2 and the inside of the molding (a), which is, at the prescribed mold opening stage, blown down by the male mold 2 at a stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold release device for plastic molded products, particularly for bottomed cylindrical plastic molded products.

Conventionally, a mold used for molding such a plastic molded product is installed so that the axis of the molding cavity is oriented horizontally in order to cause the released molded product to fall from the mold using its own weight.

It is an object of the present invention to enable a molded product of this type to be simply released from the mold by ejecting air and allowed to fall out of the mold.

The plastic molded product mold release device of the present invention is used to mold a bottomed cylindrical plastic molded product, and in a mold in which the axis of the molding cavity is oriented horizontally, pressurized air is ejected to the bottom surface of the female mold when the mold is opened. The first mold release means by ejecting the mold is performed by blowing pressurized air to the tip of the male mold during the mold opening process, for example, at the stage of high-speed mold opening or before and after the mold opening starts to slow down. The second mold release means by air protrusion,
At the same time as or in addition to the second mold release means on the circumferential surface of the tip of the male mold! A third # type means by air protrusion which blows out pressurized air after a delay is provided, and the mouth end of the molded product is removed at the initial stage of mold release of the molded product on the male mold by the above-mentioned 2.3 mold release means. The pressurized air nozzle blows pressurized air at the upper side around the mouth end of the molded product, and the pressurized air nozzle blows pressurized air at the lower side around the mouth end of the molded product until the mold opening stage. It is characterized by being prepared for.

According to the present invention, when the mold is opened, the first mold release means on the bottom surface of the female mold is already blowing out pressurized air. This can be done, for example, by connecting the nineteenth mold means to a timer-controlled solenoid valve and opening the solenoid valve before opening the mold to activate the first mold release means.

In this way, when the bottomed cylindrical plastic molded product is opened,
It remains on the cavity surface of the male mold.

In the present invention, the second mold release means at the tip of the male mold then blows out pressurized air during the mold opening process, such as the high-speed mold opening stage or the stage before and after the mold opening starts to slow down, and simultaneously with or after this. After a delay, the third mold releasing means on the circumferential surface of the male mold tip blows out pressurized air. The operation timing control of the second and third mold releasing means can also be performed by the same means as in the first mold releasing means.

The molded product on the male mold is released from the male mold by ejecting pressurized air from the second and third mold releasing means.

1i11 in the male mold of the molded product: At the initial stage of the mold, from the pressurized air nozzles on the upper and lower sides of the male mold, the air is directed towards the mouth end of the molded product at the upper and lower sides around the mouth end. is blown with pressurized air and continues to do so until the predetermined mold opening stage. Pressurized air flows from the mouth end of the molded product into the gap between the inner surface of the molded product and the male mold cavity surface, and the air pressure blows the molded product from the male mold to the desired mold. At the opening stage, that is, at the stage where the mold is opened to the extent that the molded product can fall from the mold opening space, it is blown off all at once.

In this way, the present invention can easily release the molded product from the mold by ejecting air in a mold for molding a plastic molded product of a predetermined type, and allow the molded product to fall out of the mold, thereby achieving the intended purpose. It is reached.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, (1) is a female mold, (2) is a male mold, and the female and male molds have a cylindrical shape with a bottom, for example, a cavity (3) whose axis is horizontal for molding a bucket-shaped plastic molded product. . The female mold (1) is mounted on a fixed mounting plate (4) and the male mold (2) is mounted on a movable mounting plate (5) which can move in the required direction. Male mold (2) that goes with the movable mounting plate (5)
By moving to the left in the figure, the female mold (1) and male mold (2) open.

A first mold release means (6) using air protrusion is provided on the bottom surface of the molding cavity surface of the female mold (1), and a second mold release means (6) using air projection is provided on the tip surface of the molding cavity surface of the male mold (2). C7), and an eighth mold release means (8) by air protrusion is provided on the tip end curve of the molding cavity surface of the male mold (2). As these mold release means (6), (7), and (8) by means of air protrusion, those known per se can be applied. In the case of the illustrated format, the first mold release means (6) is a fixed plug type air valve that blows out pressurized air from a narrow slit (not shown) on the circumference, and the second mold release means (7) is a fixed plug type air valve that blows out pressurized air from a narrow slit (not shown) on the circumference. An eighth mold release means (
8) are each formed into a narrow slit. Furthermore, the male type (
In 2), pressurized air nozzles /l/(9), αq are installed at the upper side and the lower side around the mouth end of the molded product (a).
be equipped with. Pressurized air nozzle #(9) and (IQ is air injection port 01 located near the mouth end of the molded product (a) and opened laterally toward the molding cavity (3) side), and the [1 noya\ Located in the front (right side of the figure) and molding capitivity (3)
It has an air injection port 02 that opens diagonally forward on the side. A concave portion 21) and e4 are formed at a portion corresponding to the nozzle /l/(9) Ofl of the female mold (1).

The first mold release means (6) communicates with the solenoid valve 04) through the passage 03, and the second mold release means (7) communicates with the solenoid valve OQ through the passage 00.
The eighth M type means (8) is connected to the solenoid valve 0 through the passage αη, and the pressurized air nozzle (9) α9 is connected to the passage 01.
It communicates with the solenoid valve through. Solenoid valve (14), (1
0, (+Ladle and (A) are connected to a pressurized air source (not shown).The solenoid valve 04) of the first mold release means (6) is opened before the mold is opened, and when the mold is opened, the 11iiiI Mold means (6)
Pressurized air is blown out from the second mold release means (7), and the solenoid valve OQ of the second mold release means (7) is opened at the stage of high-speed mold opening or at the stage before and after the mold opening starts to slow down, and the second R-type means (7) is opened. Pressurized air is blown out from the solenoid valve a of the third mold release means (8).
The frame is opened at the same time as or slightly later than the opening of the solenoid valve OQ, and pressurized air is blown out from the third mold release means (8). The operating timing of the solenoid valves, such as the solenoid valves, can be controlled by appropriate means.
For example, a timer may be used. Pressurized air nozzle (9
) and the solenoid valve 0Q are at the initial stage of mold release by the 2.3 mold release means (7) and (8) of the molded product (a), for example, when the molded product (a) moves toward the front of the male mold (2). It is opened when the air protrudes by about 10 mm and is maintained until a predetermined mold opening stage, during which pressurized air is injected from the pressurized air nozzles /I/(9) and αQ.

The operation of the device of the invention in the illustrated embodiment is as follows.

When the male mold (2) is moved to the left in the figure and opened, pressurized air is already being blown out from the first mold release means (6), and the molded product (a) is released from the female mold. It is peeled off from the cavity surface of (1) and remains on the male mold (2) side.

Then, at the stage of high-speed mold opening or before and after the mold opening slows down, pressurized air is blown out from the second # mold means (7), and the bottom of the molded product (a) on the male mold (2) is The mold is released, and at the same time or slightly later than this, pressurized air is blown out from the third mold release means (8), and the shell of the molded product (a) is released from the mold.

Furthermore, the molded product (a) is moved about 10 mm in front of the male mold (2),
At the mold release stage when air is ejected, pressurized air nozzle (9), αQ
Pressurized air is injected from the upper and lower sides around the mouth end of the molded product (a) to the mouth end of the molded product (a), and the injected air hits the male mold (2) cavity surface and the molded product ( 8.) The molded product (a) flows from the mouth end into the gap between the inner surface and the molded product (a), and due to the wind pressure, the molded product (a) is blown off from the male mold (2) at a predetermined mold opening stage.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. (1) is the female mold, (2) is the male mold, (3) is the molding cavity (4), (5) is the mold mounting plate, (6
) is the first #I type means, (7) is the second #I type means, (8
) is the third mold release means, (9), Of) is the pressurized air nozzle, (M), α*, agl, m is the solenoid valve, and (a) is the molded product. □ (more than) ゛.

Claims (1)

[Claims] ■ In a mold with a sideways molding cavity axis for molding a bottomed cylindrical plastic molded product, there is a first separation caused by an air protrusion that blows out pressurized air at the bottom of the female mold when the mold is opened. A mold means is attached to the tip of the male mold at the same time as the second mold releasing means, or a second mold releasing means is applied to the tip surface of the male mold by ejecting pressurized air in the mold opening process. or! A third mold release means using air projection that blows out pressurized air after a delay is provided, and the mouth end of the molded product is removed from the molded product on the male mold in the initial stage of mold release by the above-mentioned 2.3 mold release means. A pressurized air nozzle is used above the periphery of the part to blow pressurized air to the mouth end, and to blow pressurized air to the mouth end at a predetermined level, and to continue this until a predetermined mold opening stage. A plastic molded product mold release device, characterized in that the above male mold is equipped with it.