JP2617359B2 - How to remove molded products - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for removing a molded product, and particularly to a method for removing a molded product curved in an arc shape from a mold.

(Prior Art) As a conventional technique for removing a molded product from a mold, for example, as shown in FIG. 4, a molded product 3 is placed in a cavity between a fixed mold 1 and a movable mold 2. The cylinder 4 is disposed below the center of the molded product 3, and compressed air is fed from the mold into the space through the communication hole 5 at the time of release from the cylinder 4. A means for removing the garbage was used.

(Problems to be Solved by the Invention) However, with such conventional means, it is difficult to remove the molded product, for example, when the molded product is curved in an arc shape such as used for a joint part of a rain gutter. And other issues. In addition, it is conceivable to remove the molded product from the core by applying an urging force to the molded product so as to slide along the curved surface of the core. Therefore, there is a problem that the structure becomes complicated.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a removal method capable of easily removing a molded product having a shape curved in an arc from a mold with a simple configuration. It is in.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a mold formed in a mold having a fixed-side mold and a movable-side mold and having an arc-shaped curved core inside. In a method of removing a molded product for removing a product to the outside, one end of a stripper plate is rotatably supported by the moving-side mold, the other end is in contact with an upper end of an ejector pin, and a through hole is provided at an intermediate portion. The ejector pin is attached to the ejector plate which can be reciprocated vertically by the operation of the pin by projecting the other end of the ejector pin so that the peripheral edge of the through-hole is in contact with the lower end surface of the molded product. With the core fixed to the movable mold, the ejector pins are moved upward together with the ejector plate by moving the protruding pins upward, and the stripper plate is moved with the one end portion inward. As is rotated by the action of the biasing force to the molded article, the molded article is slid along the curved surface of the core, characterized in that as removed from the core.

(Operation) According to the above configuration, in the method of the present invention, when the projecting pin is moved upward in a state where the core is fixed to the movable mold when the mold is opened, the ejector pin moves upward together with the ejector plate, and the stripper The plate rotates about one end rotatably supported by the movable mold, and a biasing force is applied to the molded product, and the molded product slides along the curved surface of the core and is removed from the core. .

In the present invention, the core curved in an arc shape is separated from the movable mold by simply providing the stripper plate rotatably by using the ejector pins and the protruding pins which have been conventionally used in the ejector process. In addition, a cylindrical molded product curved in an arc can be taken out.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 3 shows the appearance of a molded article 13 to be removed from the mold. This is a resin molded product used for a joint part of a rain gutter, for example, and has a cylindrical shape curved in an arc shape.

Here, FIGS. 1 and 2 show a first embodiment of the present invention.

A characteristic of the present invention is that it has a wiping means for rotating a stripper provided in the vicinity of a mold mating surface in a mold opening direction, and fixes the core to a movable mold at the time of mold opening. In this state, a biasing force is applied to the molded article by the wiping means, and the molded article is slid along the curved surface of the core to be removed from the core.

That is, in the present embodiment, as shown in FIG. 1, the fixed mold 11 and the movable mold 12 are in a closed state, and the movable mold 12 has a core 14 arranged vertically. ing.

One end of the core 14 has a cylindrical portion 14a having a large diameter, and the other end has a curved portion 14b having a smaller diameter than the cylindrical portion 14a and curved in an arc shape, and these are integrally formed via an intermediate conical portion 14c. Connected. Then, a cavity is formed by the curved portion 14b of the core 14, the fixed mold 11 and the movable mold 12, and a molded article 13 is formed in the cavity.

In addition, a stripper plate that can rotate around a fulcrum 18 at one end is provided on the movable mold 12 near the mold mating surface.
The other end of the stripper plate 16 is connected to an ejector pin 15. Further, a stripper hole 16a to be fitted into the conical portion 14c of the core 14 is formed in the middle of the stripper plate 16. In this embodiment, the stripper plate 16, the fulcrum 18, and the ejector pins 15 have a function of removing the molded product from the core 14.

Next, a method for removing a molded product according to the present embodiment will be described.

As shown in FIG. 2, after the mold is opened, the projecting pin 20
Is ejected, the ejector plate 17 is pushed up, and at the same time, the ejector pins 15 are also pushed up. For this reason, while the core 14 is fixed to the movable mold 12, the stripper plate 16 is supported by the rising of the ejector pin 15.
It rotates around 18 in the mold opening direction (arrow direction). Along with this rotation, the peripheral edge of the stripper hole 16a exerts a forcible urging force on the molded product 13, so that the molded product 13 is slid along the curved surface of the core 14 and removed from the core 14.

(Effects of the Invention) As described above, the present invention provides molding for taking out a molded product formed in a mold having a fixed mold and a movable mold and having a core curved in an arc shape inside. In the method for removing an article, one end of a stripper plate is rotatably supported by the movable side mold, and the other end is in contact with an upper end of an ejector pin to form a through hole in an intermediate portion, and a peripheral portion of the through hole is formed. Abut on the lower end surface of the molded product, and project the lower end of the ejector pin to an ejector plate that can reciprocate up and down by actuation of the pin, and fix the core to the movable mold when the mold is opened. In this state, the ejector pins are moved upward together with the ejector plate by moving the projecting pins upward, and the stripper plate is rotated around the one end to form the ejector pins. By applying a biasing force to the molded product, the molded product is slid along the curved surface of the core and removed from the core, so that the molded product with a curved shape can be easily removed from the mold with a simple configuration. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional front view of a mold showing a first embodiment for carrying out the method of the present invention, FIG. 2 is a view showing a state in which a molded product is taken out, and FIG. FIG. 4 is a cross-sectional front view of a conventional mold, showing the appearance of a molded product to be invented. 11: fixed mold, 12: movable mold 13: molded product, 14: core 14a, curved part, 15: ejector pin 16, stripper plate 18: fulcrum

Claims (1)

(57) [Claims] 1. A method for removing a molded product formed in a mold having a fixed mold and a movable mold and having a core curved in an arc inside, comprising: a stripper plate; Is rotatably supported on the movable side mold, and the other end is in contact with the upper end of the ejector pin to form a through hole in an intermediate portion, and the peripheral edge of the through hole is formed on the lower end surface of the molded product. Abutting, and projecting the lower end of the ejector pin to an ejector plate that can reciprocate up and down by actuation of the pin, and fixing the core to the movable mold when the mold is opened. By moving the ejector pin upward, the ejector pin is moved upward together with the ejector plate, and the stripper plate is rotated about the one end to exert an urging force on the molded product, thereby causing the molded product to move. A method for removing a molded product, wherein the molded product is removed from a core by sliding along a curved surface of the molded product.