JPS5923530B2 - Plastic sheet compression molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compression molding apparatus for plastic sheets.

Recently, attempts have been made to replace metal parts with plastic parts for automobile parts in order to reduce the weight of the vehicle and achieve energy conservation. Reinforced plastics are attracting attention as a substitute for metal materials due to their physical properties. When using reinforced plastic materials as automobile parts, it is essential that they be injection molded. Conventionally, in order to obtain injection molded products made of reinforced plastic, the injection molding machine is compatible with a mold that is fixedly installed in the press machine (mold clamping machine), and the injection molding machine handles the clamped mold. The method used was to inject, mold, cool and solidify the molded product, and then open the mold and take it out. According to this, since each piece of equipment operates only in one step of the mold process, the operating rate of these equipments is low, and in other words, this is considered to be the cause of a decline in molding efficiency or productivity. Therefore, the productivity of plastic molding is considerably lower than that of metal press working, and therefore, in order to achieve the above objective, it is desirable to increase the speed of plastic molding to increase its productivity. 0 The present invention was made under such circumstances, and examples thereof will be described below with reference to FIGS. 1 to 4.

In FIGS. 1 and 2, reference numeral 1 denotes a circular annular body that can rotate intermittently at equal angles around the vertical axis 2, and is placed on a pair of rails 4 laid on a pedestal 53 via idle wheels 5. Furthermore, a clamping roller T is provided for the guide rail 6 laid in the center of the pedestal 3 to prevent it from wobbling laterally.

The annular body 1 performs intermittent rotation at equal angles (45 degrees in the embodiment) by interlocking a gear 9'o that engages with an internal gear 8 provided inside the annular body 1 with an intermittent drive device (not shown). . On this annular body 1, molds (eight in total) 10 are provided at equiangular intervals. As shown in FIG.
, a lower mold 12 provided on this base plate 11 , and this lower mold 12
It consists of an upper mold 13 facing the upper mold 13 and a mold mounting plate 14. As shown in FIGS. 1 to 3, a press machine 15 is provided at one of a plurality of mold stop positions. This press machine 15 includes a pair of pillars 16 and 17 erected from a frame 3 on the inside and outside of the annular body 1, and these pillars 16 and 17.
A receiving member 18 that is supported between the upper ends, is located above the annular body 1, and is capable of receiving the mold mounting plate 14.
and a piston 19 that can come into contact with the lower surface of the base plate 11 and lift it up, and the support columns 16 and 17 and the receiving member 1
8 and is constructed in a gate shape. Furthermore, as shown in FIG. 1, a mold opening machine 20 is provided at another mold stop position (a position displaced by 180 degrees from the press machine), and a mold closing machine 21 is provided at the next stop position. 2 is a water supply tank, and 23 is a drainage tank, which are ring-shaped and concentric with the annular body 1. Cooling water is supplied into the boxes of the upper mold 13 and the lower mold 12 from a water supply tank 22, and waste water is introduced into a drainage tank 23. 24 is preheated oven 25
This is a comparator device for conveying reinforced plastic sheets, which is installed through the.

This conveyor device 24 has a conveyance end portion facing the mold stop position where the press machine 15 is installed from the outside of the annular body 1. The conveyor device 24 is an example of a carry-in device.
Other analogs may be used instead. Note that this conveyor device 24 includes the annular body 1 and the press machine 1.
intermittent operation in synchronization with 5). 26 is a reinforced plastic sheet handling robot installed in the center of the annular body 1.

This robot 26 is equipped with a plurality of suction cups 29 at the distal end of a horizontally extending and retracting shaft 27 via an elevating shaft 28.
Then, by the operation 3, the reinforced plastic sheet 30 carried in by the conveyor device 24 is transferred to the conveyor device 24.
From there, it is fed into the mold 10 which has entered the press machine 15.
The robot 26 is →1 of the delivery device. The operation of the above configuration will be explained.

The mold 10, which has reached the position of the press machine 21 through three intermittent rotations of the annular body 1, is moved to the oven 25 by the robot 26.
A preheated reinforced plastic sheet 30 is fed while passing through the mold, and is clamped by the rising piston 19 and the receiving member 18. After the mold clamping is completed, the mold 10 is attached to the ring φ-shaped body 1.
The mold 10 or the molded product is moved in a circular path by intermittent rotation of 5 degrees, and during this rotation, the mold 10 or the molded product is cooled by cooling water from the water tank 22. With the molded product cooled, the mold 10 reaches the mold opening machine 20, where the mold is opened and then the molded product is taken out by the take-out device. will be carried out. Next, the mold 10 from which the molded product has been taken out is sent to a press machine 15 in an open state, and is subjected to molding again. A pair of hydraulic cylinders and a unit for self-locking the mold are attached to each mold mounting plate, and the unit allows self-locking of the mold in the open/closed state. In this way, when the mold 10 is intermittently stopped rotating, each working section performs its work at once. In the above embodiment, the press machine 15 and the conveyor device 24 were installed at one of the plural mold stop positions, but as shown in FIG.
It is also possible to arrange them at 80 degrees symmetrical positions, and if a sufficient cooling path can be provided, the arrangement can be arbitrarily changed such as every 120 degrees or every 90 degrees.As described above, according to the present invention, the annular body It goes without saying that it is possible to mass-produce plastic sheets one after another by rotating the press intermittently and operating the press machine intermittently, but when compression molding plastic sheets, the piston is pushed up and pressed against the mold receiving member. Although the mold is conveyed by an annular body, the pressing force of compression molding does not act on the annular body.

Therefore, there is no need to make the annular body particularly strong, and its lifespan can be maintained for a long time.
Therefore, it is economical.

[Brief explanation of the drawing]

1 to 3 show one embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. 3 is a longitudinal cross-sectional view of the press section. FIG. 4 is a schematic plan view showing another embodiment.

Claims (1)

[Claims] 1. Provide a circular annular body that can freely rotate around a vertical axis,
An intermittent drive device is provided to rotate the annular body intermittently at equal angles, molds are provided on the annular body at equal angles, and through holes are formed in the annular body directly below each mold to stop the molds appropriately. The plastic sheet fed into the mold is compression-molded by lifting the mold through the receiving member located above the mold and the through hole of the annular body and pressing the mold against the receiving member. 1. A compression molding apparatus for a plastic sheet, comprising a press machine having a piston, a carry-in device for a preheated plastic sheet, and a delivery device for feeding the plastic sheet from the carry-in device to a mold.