JPS6330845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for press molding resin composite materials and the like.

Recently, sheet-like resin composite materials formed by mixing or impregnating resin materials with glass fibers, carbon fibers, etc. have been press-molded and used in place of steel products. However, conventional press forming methods for resin composite materials, etc. are press forming in the same way as conventional sheet metal processing, and the press forming cycle diagram showing the relationship between press stroke and time is shown in Figure 1. Something like, material input A,
This is done in various processes such as closing the metal plate B, processing and forming C, opening the mold release D, and taking out the product E.
When resin composite products are used in automobiles and the like, it is possible to reduce assembly man-hours and reduce weight through integral molding, but the disadvantage is that the press molding cycle time is long. Research to improve resin composite materials is progressing,
Although it is possible to shorten the molding time, there are certain time constraints due to the softening fluidity, rapid hardening properties, etc. peculiar to resin materials, and it is difficult to shorten the molding time significantly. However,
Analyzing the press molding cycle diagram, the pressure molding time is about half of the total time required, and the remaining time is used for adding materials, removing products, closing and opening the mold, etc. , the actual pressure forming efficiency of press forming equipment is low, and although a large output is required to process the molding material during pressure forming, it is small during non-pressure forming other than pressure forming. The output is sufficient. Moreover, during pressure molding, which requires high output, the stroke is extremely small as shown in Figure 1, and the large stroke of the press cylinder is used for loading materials, taking out products, and opening and closing the mold. It is something that exists.
In order to shorten the press molding cycle and improve productivity, the compression molding machine described in Japanese Patent Publication No. 50-18510 was invented. Large and
It is heavy and cannot be manufactured at low cost. Rather, by putting molding material into the bolster, equipment mounted on the bolster, or the bolster,
The cost increases due to the equipment required to take out the press-formed product from the bolster, and, as in the past, a large amount of air is contained in the cylinder with a large stroke, making it impossible to improve position accuracy and response accuracy. Furthermore, because the pressure set for clamping the mold and the mold set for holding pressure and releasing the mold are placed on the same bolster, vibrations from the pressure press during operation are transmitted to other parts, resulting in damage to the molded product. There was a risk that the accuracy would decrease.

The present invention has been developed in consideration of the above points, and by separating the pressure forming process and the non-pressure forming process, the press forming cycle time required by the conventional method can be reduced by almost half. Despite doubling productivity, equipment costs can be kept low, and the pressurized cylinder has a small stroke to minimize the amount of air in the hydraulic cylinder, improving responsiveness and positioning accuracy. It is an object of the present invention to provide a high-speed, high-productivity press-molding method for resin composite materials, etc., which can be press-molded with high precision without affecting the vibration of the main press device and on the auxiliary press device.

Hereinafter, the present invention will be explained based on examples.

FIG. 2 shows an embodiment of a manufacturing apparatus for carrying out the present invention, in which auxiliary press apparatuses 2 and 3 are arranged before and after a main press apparatus 1, respectively. The main press device 1 is dedicated to pressure forming as explained in the press forming cycle diagram in FIG. The lower frame 7 side is capable of being raised and lowered using a program control method or the like. Between the slide 6 and the lower frame 7, a resin composite molding material 8 formed into a sheet by mixing or impregnating glass fiber, carbon fiber, etc. with a predetermined thermosetting resin material is placed between the front and back. auxiliary press device 2,
The mold device 9, which has been tightened as specified in step 3 and has become shorter, is installed in a specified position, and the molding material 8 is pressurized as specified and held under pressure so that the desired product 10 can be molded. There is. The auxiliary press devices 2 and 3 are
It is configured in a plane symmetrical manner with respect to the main press device 1, and the molding material 8 is introduced during pressure molding in the main press device 1, the molding material 8 is charged in the mold device 9, and the molding material 8 is
This device performs non-pressure forming other than pressure forming, such as fluid filling into the mold device 9 and taking out the product 10, and has lifting cylinders 12 and 13 with a required small output and large stroke on the side of the lower frame 11. are arranged respectively,
The upper mold 16 can be detached by clamping devices 14 and 15.
The beam-shaped upper frame 17 to which is fixed can be raised and lowered by a program control method or the like. The lower mold 18 of the mold device 9 is mounted on a bolster 19 and placed at a predetermined position on the lower frame 11, and the upper mold 16 is removed from the upper frame 17 and the lower mold 18 is paired with the lower mold 18. The mold device 9 mounted on the bolster 19 is transferred to the main press device 1 as described above using a transfer device (not shown) such as a hydraulic cylinder so that it can be returned. Although not shown, the mold device 9 circulates a heat medium such as steam or hot oil,
The temperature is maintained at an appropriate temperature depending on the molding material 8. 20 is a transfer rail for transferring the mold device. Note that for the main press device and the auxiliary press device, temperature correction of the guide portion, reinforcement against eccentric loads, etc. are omitted, but they can be carried out as appropriate in the case of known devices.

A press forming method using the manufacturing apparatus configured as described above will now be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the molding material 8 preheated to a predetermined temperature is charged into the auxiliary press device 2 with the upper frame 17 raised and the upper mold 16 opened. The upper mold 16 is lowered in synchronization with the lifting cylinders 12 and 13, and the molding material 8 is filled into the cavity 21 of the mold device 9 as shown in FIG. Since the molding material 8 is in a softened state, the molding material 8 can be flowed and filled into the cavity 21 with a small output equivalent to the weight of the upper mold 16 and the upper frame 17. During this time, the main press device 1
Now, the upper mold 16 is clamped as specified by another auxiliary press device 3, and the mold device 9, in which the molding material 8 is filled into the cavity 21, is pressed by a pressurizing cylinder 5 with a predetermined large output as shown in FIG. The molding material 8 is press-molded into a predetermined shape by applying pressure and holding the pressure.
Since the main press device 1 only presses and molds the mold device 9 that has been clamped by the auxiliary press device 3, the high output pressure cylinder 5 may have a predetermined small stroke. When the pressure forming of the main press device 1 is completed, the slide 6 is raised, and as shown in FIG. The mold device 9, which has been clamped as specified by the device 2 and the upper mold 16 has been removed from the upper frame 17, is transferred to a fixed position in the main press device 1 by the transfer device. In the main press device 1, the molding material 8 is press-formed as described above, and in the auxiliary press device 3, the lifting cylinders 12, 13 are lowered, and the clamp device 14,
15 is closed, the upper mold 16 is fixed to the upper frame 17, and the product 10 is released from the lower mold 18 using a knock-out device (not shown), and the product 10 is taken out. The mold is put into the mold device 9 and the mold is clamped as specified. In this way,
The auxiliary press devices 2 and 3 are used alternately, and the main press device 1 sequentially performs pressure forming. Therefore, the press molding cycle time can reduce the time for non-pressure forming, and although it depends on the molding material and molding pressure conditions, the press molding cycle time can be equivalent to the press molding cycle time of the main press equipment, which is almost the same as that of the conventional method. 1/2
This can be shortened to a certain extent. In addition, the fluid filling of the molding material into the mold device can be done within the time required for pressure molding, so a molding material with good softening and fluidity can be used, and every corner of the cavity can be filled, making molding easier. It is. As mentioned above, although the press molding cycle time can be reduced to almost half that of the conventional method and productivity can be doubled, the main press equipment has a small stroke that is the minimum necessary, and therefore the equipment is small. The auxiliary press device may also be of a small output to the minimum required level, so the structure may be simple and the increase in equipment cost may be small. Furthermore, since the internal capacity of the molding cylinder can be reduced, the amount of oil compression is reduced, improving responsiveness, positioning accuracy, and pressurizing accuracy. The above is more noticeable when molding a product that is large and requires a large stroke.

In the above embodiment, auxiliary press devices are placed before and after the main press device to carry in and take out the mold device at the same time, thereby shortening the press molding cycle time of the main press device as much as possible.
The mold devices may be transferred separately, or the molds may be transferred using a mold changing device such as a quick changer. In addition, in the case of a plant that has multiple main press devices and auxiliary press devices, conveyance devices can be appropriately installed in the main press device and auxiliary press devices, and molds can be delivered under computer management. It is something. Furthermore, it is also possible to mold a plurality of products at the same time.

In addition, the molding material is not limited to thermosetting resins, but may also be thermoplastic resins, and is not limited to reinforced materials such as glass fibers, as long as the present molding method can be applied and there are advantages. It's good.

As described above, in the present invention, the auxiliary press device can perform non-pressure forming such as adding materials, opening and closing the mold, and taking out the product while the main press device is press-forming, thereby reducing the press-forming cycle time. Although it can double the productivity by reducing the time to almost half of the conventional method, it does not require the high output and large stroke press forming equipment of the conventional method, so the main press The price of the device can be reduced by almost half, and the auxiliary devices need only have the minimum necessary output, so the structure is simple and inexpensive, and equipment costs can be reduced. Furthermore, since the stroke of the main press device can be made as short as possible, the amount of oil compression is reduced, and responsiveness and positioning accuracy are improved. Furthermore, even though the main press device and the auxiliary press device can work simultaneously, press forming can be performed with high precision without the vibrations generated during the work of the main press device affecting the auxiliary press device.

[Brief explanation of the drawing]

Fig. 1 is a press forming cycle diagram showing the relationship between press stroke and time in a conventional example, Fig. 2 is a partially omitted schematic side view of a manufacturing apparatus according to an embodiment of the present invention, and Figs. 3 to 5 These are side views for schematic explanation for explaining each molding process same as the above. 1... Main press device, 2, 3... Auxiliary press device, 8... Molding material, 9... Mold device, 10...
product.

Claims (1)

[Claims] 1 The main press device is formed into a high output, small stroke hydraulic press device that performs pressure forming from the clamped state of the mold device, and the auxiliary press device is used to attach molding material to the mold device, The product is formed into a device with a small output and a large stroke to take out the product from the formed mold device, and the above-mentioned auxiliary press devices are placed adjacent to the main press device on both sides of the main press device and pressurized by the main press device. The molding device is characterized in that, at the same time, the mold device that has been formed is transferred to one of the auxiliary press devices, the molding material is charged into the other auxiliary press device, the mold device that has been clamped is transferred to the main press device, and press molding is performed. Press molding method for resin composite materials, etc.