JP3357740B2 - Mold release equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product releasing apparatus for releasing a molded product, for example, after injection molding, from a molding die.

[0002]

2. Description of the Related Art For example, when a molded article having a desired shape is obtained by injection molding a material such as a rubber material, it is necessary to release the molded article from the mold after the injection molding is completed. In particular,
In the case of a product having a complicated shape as shown in FIG. 3, when the mold is opened, the mold is firmly adhered to the mold, so that it is not easy to release the mold.

Conventionally, an operator releases a molded product by pulling one end of the molded product. However, not only is the problem of an increase in product costs and various equipment costs for maintaining a working environment, but also the peeling operation is not easy. Unless carefully performed, there is a problem that the surface of the molded article is damaged such as being scratched. For this reason, an apparatus disclosed in Japanese Utility Model Laid-Open No. 6-724 has been proposed as an apparatus for automating such a releasing operation. This mold release device releases a molded product from a mold using a fluid such as air.

[0004]

However, in the method of blowing a fluid such as air between the molded article and the mold, a large amount of air is required, although the mold release success rate is excellent. This problem was remarkable particularly when molding was performed using a highly adhesive molding material. In addition, according to the air blow, the molded product is scattered after the mold is released, so a device for collecting them at one place is also required.Therefore, there is a problem in using the air blow type release device in a mass production line. there were.

The present invention has been made in view of such problems of the prior art, and in automating the operation of releasing a molded product from a molding die, the success rate of the release is high and damage to the molded product is reduced. It is an object of the present invention to quickly perform demolding with a new method that does not require application and does not require a large amount of fluid.

[0006]

In order to achieve the above object, a molded product releasing apparatus according to the present invention is provided so as to be capable of opening and closing a molded product adhered to a molding die, and contracts one end of the molded product. It has a chuck having a diameter and a pin that passes outside one end of the molded product reduced in diameter by the chuck and pushes up the outer surface of the molded product.

[0007]

First, the chuck is closed with respect to the molded product that has been adhered to the molding die after the molding is completed, and one end of the molded product is reduced in diameter. In this state, the pin is passed through the outside of one end of the molded product reduced in diameter by the chuck, and the outer surface of the molded product is pushed up. As a result, one end of the molded product is reduced in diameter by the chuck, so that the molded product can smoothly pass through the portion of the molding die that hinders die removal.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part showing a mold release apparatus for a molded product according to an embodiment of the present invention, wherein (A) to (C) are views for sequentially explaining the operation, and FIG. FIG. 3 is a plan view showing a chuck, and FIG. 3 is a cross-sectional view showing a molded product and a molding die applied to the release device of the embodiment.

First, a molded article 2 (see FIG. 3), which has been subjected to molding such as injection molding, is placed on a fixed base (not shown) together with the molding die while being attached to the molding die 1. The molded article 2 described in the present embodiment is a rubber seal member used for an automobile brake booster as shown in FIG. 3, and is formed in a cylindrical shape with both ends opened. Since a small-diameter portion 2a that is constricted inside is formed in the molded product 2, after the injection molding is completed, the molded product 2 does not remain in the upper mold, the lower mold, and the core (neither is shown). It will remain in the mold 1 arranged between the upper and lower molds shown.

In order to release such a molded article 2 from the mold 1, it is necessary to pull out the molded article 2 upward or downward in FIG. 3, but the adhesiveness is particularly high. When molded from a material, an adhesive force acts on the interface 5 between the mold 1 and the molded article 2. Since this adhesive force acts as a large resistance force in the pulling-out direction, if the molded product 2 is suddenly pulled out, the molded product may be damaged. It is also designed to prevent mold damage. This configuration will be described later.

Below the mold 1 mounted and fixed on the base, there are provided chucks 3, 3 for gripping one end (the lower end in FIG. 1) 2a of the molded product 2 and reducing its diameter. . As shown in FIGS. 1A and 1B, the chucks 3 and 3 are provided such that two claws open and close (close and move away from each other), and as shown in FIG. A semi-circular notch 3a is formed. The opening and closing of the chuck 3 can be performed by, for example, a fluid cylinder. In this embodiment, only one chuck 3 is reciprocated, and the other chuck 3 is reciprocated by, for example, a rack and pinion mechanism connected to one chuck. You may be comprised so that it may be performed. In this case, not only one fluid cylinder is required, but also two fluid cylinders are always moved toward a fixed center point without requiring the operation synchronization of the two fluid cylinders.
One chuck 3, 3 can be reciprocated.

On the other hand, two pins 4 and 4 are provided integrally below the chucks 3 and 3 and can be moved up and down by a fluid cylinder or the like (not shown). That is, the lower limit position shown in FIGS.
It reciprocates between the upper limit position shown in FIG. In this case, as described above, each of the pins 4 and 4 rises through each of the semicircular notches 3a and 3a formed in the chucks 3 and 3, respectively. The fluid cylinder for opening and closing the chucks 3 and 3 and the fluid cylinder for moving the pins 4 and 4 up and down as described above can obtain the same operation and effect even by the configuration of the motor and the gear mechanism.

As described above, the main configuration of the release apparatus of this embodiment is as follows.
Although the description has been given of a pair of mold release structures including the mold 1, the molded article 2, the chuck 3, and the pin 4, when a large number of molded articles 2 are taken by one mold 1 in injection molding, the number of molded articles is required. May be provided according to the size of the chuck 3. When a large number of molded products 2 are to be taken in this way, the chuck 3
It is preferable to provide a plurality of release structures including the pins 4 and to release the plurality of molded products 2 in one cycle. However, the release device of the present invention can also be applied to a single-piece molded product.

Next, the operation will be described. First, when the injection molding is completed, the mold is opened, and as shown in FIG. 1A, the mold 1 to which the molded article 2 is adhered is fixed to the base of the mold release apparatus of the present embodiment. At this time, the chucks 3, 3 are in the open position, and the pins 4, 4 are in the lowermost position. Next, as shown in FIG. 1B, the chucks 3 and 3 are closed, and the lower end of the molded product 2 is gripped to reduce the diameter. As a result, a portion of the molded product 2 below the small diameter portion 2a is peeled from the molding die 1. Then, as shown in FIG.
The pins 4 and 4 are raised and the outer surface of the molded product 2 is pushed up while the diameter of the lower end is reduced. At this time, the pins 4, 4 are notched 3 a, 3 a formed in the chucks 3, 3.
However, the portion above the small-diameter portion 2a of the molded product 2 is separated from the molding die 1 by the pins 4 and 4.

The molded article 2 released from the molding die 1 in this manner is supported by two pins 4 and 4 as shown in FIG. 1 (C). However, since the molded article is always present at a fixed position, it is easy to realize automatic conveyance. In addition, since it is a mold release method based on a mechanical structure using a chuck and a pin without using a peeling method using an air blow as in the related art, it can be applied to a mass production process. Further, when the mold is released, no excessive force acts on the molded product, so that there is no possibility of damaging the molded product. In addition, by automating the release operation in this way, the cost of manual operation can be reduced, and the facility cost for maintenance of the working environment and safety equipment required for the operator can be reduced. . It should be noted that the present invention is not limited to only the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

[0016]

According to the apparatus for releasing a molded article of the present invention, one end of the molded article is reduced in diameter by a chuck and the outer surface of the molded article is pushed up using a pin. The mold release operation can be automated while the mold release is performed quickly without damaging the molded article without the necessity. Therefore, manual work can be eliminated and the cost of molded products can be reduced. At the same time,
The maintenance of the working environment and the provision of safety equipment, which were necessary for the worker, become unnecessary, and the equipment cost can be reduced.

[Brief description of the drawings]

FIGS. 1A to 1C are cross-sectional views of a main part showing a mold release device for a molded product according to an embodiment of the present invention.

FIG. 2 is a plan view showing the chuck according to the embodiment.

FIG. 3 is a cross-sectional view showing a molded product and a molding die applied to the release device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Molded product 2a ... Small diameter part 3 ... Chuck 3a ... Notch part 4 ... Pin 5 ... Interface

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Claims (1)

(57) [Claims] A chuck (3) provided to be able to open and close with respect to a molded product (2) adhered to a molding die (1), and having a reduced diameter at one end of the molded product; A pin (4) for pushing up the outer surface of the molded article by passing the outer side of one end of the molded article.