JPS61233511A - Apparatus for driving slide core of mold for molding resin - Google Patents

Abstract

PURPOSE:To reduce the damage of a mold even when foreign matter is mixed in a slide core part and to make it possible to detect the position where a slide core is closed, by moving a protruding plate having a cam fixed thereto by the molded product protruding operation for a resin molding machine and performing the opening and closing operation for the slide core through a rotary lever. CONSTITUTION:When a protruding plate 10 rises, a protruding plate 11 is pushed up to demold a molded product 16 from a mold. If the protruding rod 5 of a molding machine is returned, a protruding pin 13 is returned to close a slide core 1. Because the closing the slide core 1 is dependent only on the force of the tensile coil spring 6 attached to a rotary lever 2, even when the molded product or foreign matter 17 is gotten into the space between the slide core 1 and a mold part 14, the slide core 1 is not perfectly closed by the force of the tensile coil spring 6 and stopped to prevent the damage of the mold. At this time, because the rotary lever 2 is not also returned to a usual stop position, an operation rod 7 is not pushed in and a limit switch 9 is not operated and, therefore, it can be detected that the slide core 1 is not perfectly closed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a slide core, which is necessary for molded products with undercuts and insertion positioning of inserts into molds to perform insert molding. The present invention relates to a slide core drive device in a molding die having:
The present invention also includes a foreign matter detection device for detecting foreign matter that has entered the slide core portion.

(Prior Art) Conventionally, in molding molds having a slide core, those with a structure that allow the slide core to be freely opened and closed when the mold is open are as follows:
As shown in FIG. 2, the slide core was operated using the driving force of a hydraulic or pneumatic cylinder or an electric motor.

FIG. 2 is a side sectional view of a molding die equipped with a conventional slide core drive device, in which 1 is a slide core, 3 is a mold plate, and 4 is a molding die equipped with a slide core drive device.
1 is a mounting plate, 5 is a protruding rod, 11 is a protruding plate, 13 is a protruding pin, 14 is a mold portion, and 15 is a hydraulic cylinder.

(Problems to be Solved by the Invention) In the conventional slide core opening/closing structure using a hydraulic or pneumatic cylinder or an electric motor, the driving force for opening the slide core is the mold release force of the molded product, and the sliding force. It must be able to overcome the sliding resistance of the core.
A large force is required, and therefore the driving force to close the slide core is similarly large6. Therefore, if foreign matter gets into the slide core, the mold section of the slide core will be overloaded and the mold will be damaged. There was a fear that it would. Furthermore, even if the above-mentioned mixed foreign matter is minute and does not cause damage to the mold, it is not easy to detect the inclusion of minute foreign matter.

(Means for Solving the Problems) The present invention solves these conventional problems by allowing the slide core to be freely opened and closed even when the molding die is open, and to prevent foreign matter from entering the slide core portion. The purpose is to reduce damage to the mold even if it gets mixed in, and to electrically detect the closed position of the slide core.

In order to achieve this object, the present invention has a cam on the protruding plate of the mold, and by moving the protruding plate with the ejecting operation of the molding machine, the linear motion of the cam is placed on the template plate of the mold as a fulcrum. have
In order to always act in the direction of closing the slide core, the rotational movement of a rotary lever equipped with a tension coil spring changes, and the upper end of the rotary lever differentially moves the grooved cam of the slide core.
It has a structure that changes to the opening and closing movement of the slide core.

Furthermore, an operating rod and a limit switch are attached so that when the one-turn lever rotates and closes the slide core, the displacement amount just before the lower end of the rotary lever stops is transmitted to the limit switch.

(Function) If you want to open the slide core with the above structure, use the ejection motion of the molding machine to move the protrusion plate of the mold in the ejection direction, and the rotation lever will rotate due to the action of the cam on the protrusion plate. The slide core is opened via the grooved cam of the slide core with a strong force that overcomes the mold release resistance of the molded product.

Next, when closing the slide core, reverse the ejection motion of the molding machine, the protrusion plate of the mold returns, the rotation lever comes off the cam, and the slide core closes with the weak force of the tension coil spring. Become.

In addition, if the slide core does not close completely due to a foreign object getting caught between the slide core and the mold part, the rotation stop position of the rotary lever will not reach the normal position, so the actuating rod will not operate and the limit will be Since the switch actuator is not hit, it is possible to confirm the closed position of the slide core.

Furthermore, at this time, the opening/closing position of the slide core is determined by increasing the lever ratio of the rotary lever, so that the amount of movement of the slide core is expanded and transmitted to the limit switch. Can be detected.

(Example) An example of the present invention will be described below with reference to FIGS. 1, 3, and 4.

FIG. 1 is a side sectional view of a molding die according to an embodiment of the present invention, in which 1 is a slide core, la is a grooved cam, 2 is a rotary lever, 2a and 2b are cam followers, 2c is a fulcrum, and 3 is a mold. plate, 4 is a mounting plate, 5 is a protruding rod, 6 is a tension coil spring, 7 is an operating rod, 8 and 12 are compression coil springs, 9 is a limit switch, 10.11 is a protruding plate, 10b is a cam,
Reference numeral 13 indicates a protruding pin, and 14 indicates a mold portion.

In FIG. 1, a projecting plate 10 having a cam 10b is located below a projecting plate 11 provided with a projecting pin 13 for projecting a molded product, and is constantly pressed against a lower mounting plate 4 by a compression coil spring 12.

When the protruding rod 5 pushes up the protruding plate 10 during the protruding operation of the molding machine, it is possible to move the cam 10b up and down.

The rotating lever 2, which has a rotational fulcrum 2c on the template 3, has one end in contact with the cam 2b and the other end fitted into the groove of the grooved cam 1a of the slide core 1, and has a cam follower 28 and 2 in an operating position.
b is fixed.

Further, a tension coil spring 6 is attached to the lowermost end of the rotary lever 2 so that a force is applied in the direction in which the rotary lever 2 always closes the slide core 1, that is, in the direction of the arrow in FIG.

Also, an actuating rod 7 transmits the movement of the rotary lever 2 to a limit switch 9 for detecting the position of the slide core mounted outside the mold.
The slide core 1 is inserted into the groove of the mounting plate 4 so that it can slide freely, and is constantly pressed toward the center of the mold by the force of the compression coil spring 8. As shown in Fig. 1, the slide core 1 In the completely closed state, the rotary lever 2 pushes back the actuating rod 7, actuating the pin of the limit switch 9, and setting it to be electrically energized.

Next, a method for driving the slide core and a method for detecting the position of the slide core with the above configuration will be explained.

FIG. 3 shows a side sectional view of a molding die according to an embodiment of the present invention, in which 16 indicates a molded product, and other symbols are the same as those explained in FIG. 1.

When the protruding rod 5 of the molding machine pushes up the protruding plate IO.

Due to the action of the cam 10b, the rotary lever 2 rotates around the fulcrum 2c, moving the grooved cam 1a and opening the slide core 1. However, when the state shown in FIG. The rotation of the rotary lever 2 stops, and even if the protruding plate 10 is raised any further, the slide core 1 stops without opening.

When the protruding plate 10 is further raised, the protruding plate 11 is pushed up and the molded product 16 is released from the mold. Molding machine protruding rod 5
, the protruding pin 13 returns and the slide core 1 closes by the reverse operation to the above.

FIG. 4 is an explanatory diagram of a case where a foreign object 17 has entered between the slide core and the mold section in one embodiment of the present invention.

Since the sliding core 1 is closed only by the force of the tension coil spring 6 attached to the rotating lever 2, as shown in FIG. Even if the slide core 1 is inserted, the force of the tension coil spring 6 does not completely close the slide core 1, and the slide core 1 stops to prevent the mold from being damaged.

At this time, since the rotary lever 2 does not return to its normal stop position, the operating rod 7 is not pressed down and the limit switch 9 is not activated, so it is possible to detect that the slide core 1 is not completely closed.

Here, the movement of the slide core 1 is magnified by the lever ratio via the rotary lever 2 and transmitted to the limit switch 9, so if this lever ratio is set large, it is easy to move the slide core 1 by a small amount. can be detected by a limit switch.

(Effects of the Invention) As explained above, according to the present invention, even in the open state of the mold, by utilizing the operation of the ejecting device of the molding machine,
The slide core can be easily opened and closed without the use of special external drive devices such as hydraulic or pneumatic cylinders or motors, and when closing the slide core, the weak force of the tension coil spring is used, so even if foreign objects Even if it gets into the slide core, it will not damage the mold.
Even if a minute foreign object gets inside, it is possible to accurately detect the abnormality using an easily available and inexpensive limit switch.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a molding die according to an embodiment of the present invention, FIG. 2 is a side sectional view of a molding die equipped with a conventional slide core drive device, and FIG. 3 is an embodiment of the present invention. FIG. 4 is an explanatory diagram of a case where foreign matter has entered between the slide core and the mold part in one embodiment of the present invention. 61...Slide core, Ia... Groove cam, 2... Rotating lever, 2a, 2b... Cam follower, 2c... Fulcrum, 3... Template, 4.
...Mounting plate, 5...Protruding rod, 6...Tension coil spring, 7...Operating rod, 8, 12...Compression coil spring, 9...Limit switch, 10.11...Protruding plate , 10b... cam, 13... projecting pin, 14-
... Mold section, work 6... Molded product, 17... Foreign matter. , Patent Applicant Matsushita Electric Industrial Co., Ltd. Figure 1 I5° Sniver 14...P! Immediately Fig. 2 15... Cleaned shisonter Fig. 3 16... Molded product Fig. 4 17... Millet proboscis

Claims (2)

[Claims] (1) By moving the protruding plate to which the cam is fixed by the molded product ejecting operation of the resin molding machine, the force of the cam is used to open and close the slide core via a rotating lever that has a fulcrum on the mold plate. A slide core drive device for a resin molding mold, characterized in that it has a structure that allows the following to occur. (2) It has a foreign object detection device that detects foreign objects that have entered the slide core by detecting the position at which the rotary lever stops when the slide core is closed. ) A slide core drive device for a resin molding mold as described in item 2.