Core push-out apparatus

Details Core push-out apparatus Core push-out apparatus

1994-02-16

1995-08-29

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

Plural wear or shaping surfaces mounted for alternative use

249102, 425185, 425186, 425192R, 425193, 425577, B29C 3330, B29C 4536

Patent

active

054455111

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a cope push-out apparatus used in a cope extraction mechanism, which is mandatory for automatic molding operation of a molding machine using a cope change type dies.


BACKGROUND ART

In molding operations using metal molds, especially in the case of molding operation for many different small-lot products, the core change type dies are normally used for the efficiency of die changing operation. These type of dies comprise a stationary die and a movable die. The stationary die consists of a stationary mother mold and a stationary cope detachably coupled with the stationary mother mold, whereas the movable die consists of a movable mother mold and a movable cope detachably coupled with the movable mother mold. These stationary and movable dies ape paired when used in the molding operation. These stationary die and movable die cooperate with each other fop a common function.
Conventionally, the core change has been be changed by manual operation. For facilitating such manual die changing operation, however, in many instances, so-called rectangular cassette type copes, which allow an operator to insert or eject the core in a direction normal to the closing direction of the dies, have been used. Beside these rectangular cassette type cores, there are rounded cassette type cores which allow an operator to insert or eject the core into a mother mold in the same direction as the closing direction of the dies. These rounded cassette type cores are advantageous due to their compactness in size and lightness in weight, but are disadvantageous due to a lack in adequate hold for the operator, in extracting them.
The rectangular cassette type cores are too heavy to handle with a robot, and so the rounded cassette type cores, being compact and light, will be preferable for automation of the molding operation, although they are as equally difficult to handle, as in the case of manual handling. This is true especially when a parting surface of the mother mold and a parting surface of the core are substantially flush with each other, and, in such a case, it is almost impossible to extract the core from the mother mold by the robot hand. To overcome this problem, it can be considered to provide a means for pushing the core from behind. Such a means, however, is not applicable to a part such as the stationary die of the molding machine where a sprue bushing or the like is located, because it is difficult to push a core by means of a mechanism at a stationary side, although applicable to a part such as the movable die of the molding machine which structurally permits the installation of an ejector or spring.


DISCLOSURE OF INVENTION

An object of the present invention is to provide an apparatus preferably applicable to a molding machine using the core change type dies and capable of pushing out the core from the mother mold, thereby facilitating the core extracting operation by the robots.
In order to accomplish the above purpose, a first aspect of the present invention provides a core push-out apparatus including a mother mold of a complementary die in the core change type dies. The said mother mold includes a main body and an intermediate plate disposed behind the main body to be movable in both the forward and backward directions. Additionally, a core fixing and releasing mechanism is provided on the intermediate plate and a pushout device is disposed in a clearance formed between the main body and the intermediate plate when the intermediate plate is shifted rearward. The said push-out device has one surface abutting on a front surface of a core and another surface abutting on a rear surface of the main body.
It is preferable that said push-out device is attached to a distal end of an arm of a robot provided together with a molding machine, and that said push-out device is slidable in both the forward and backward directions and is urged rearward.
Furthermore, it is preferable that a robot includes an actuator and an arm, said actuator including a cylinder and a piston, an

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patent: 4861254 (1989-08-01), Takeuchi et al.
patent: 4959007 (1990-09-01), Okuyama
patent: 5049344 (1991-09-01), Sorensen
patent: 5112207 (1992-05-01), Pinsonneault
patent: 5246362 (1993-09-01), Kobayashi et al.
patent: 5282733 (1994-02-01), Noritake et al.
Japanese Patent Abstract, vol. 15, No. 171, Apr. 1991 & JP-A-03 036 009, Toshiba Corp., Feb. 1991.
Japanese Patent Abstract, vol. 16, No. 250, Jun. 1992 & JP-A-04 059 321, Seikosha K.K., Feb. 1992.
Japanese Patent Abstract, vol. 17, No. 664, Dec. 1993 & JP-A-05 220 750, Fanuc Ltd., et al., Aug. 1993.

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