JPS641047Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balance support device for press forming of plastic materials.

Press molding of plastic materials is performed by fluidly filling a mold with a sheet of plastic material, but in order to form the molded product with uniform thickness and precision, the slide of the press molding machine must be set at a high height. It must slide with precision. According to certain acceptance standards, the amount of inclination of the slide in the front/back and left/right directions is 0.15.
mm/3m, and with the method of simply raising and lowering the slide, the rigidity of the press molding machine must be extremely large, and the sliding movement of the slide must be maintained with high precision as described above. This is not desirable from both economic and technical points of view. Furthermore, in the case of so-called in-mold coating, the thickness of the coating is usually 0.1 to 0.15 mm, and it is necessary to coat thinner and uniformly. For this reason, the present applicant has developed a press-forming machine for plastic plate materials that provides a balance support device in the bed portion of the press-forming machine for plastic plate materials, and supports the slide in a balanced manner over the stroke required for filling the mold with the plastic plate material. is being developed. However, this is not a particular problem in press forming where the load is small, but when the load increases to hundreds or hundreds of tons, the frame and slide of the press forming machine are not completely rigid, so the frame and slide may become distorted and the front and back of the slide may become distorted. Due to horizontal inclination, etc., the load on the balance support device becomes eccentric from the predetermined pressing center, and a horizontal component force is generated, which becomes a large force couple that easily damages the sliding surface of the balance support device and reduces durability. However, it was not possible to hold it with high precision.

This invention was developed in consideration of the above points, and it reduces the load applied to the sliding surface of the balance support device, allows the balance support device to operate with good durability and high precision, and enables molded products to be formed precisely. The object of the present invention is to provide a balance support device for press molding of a plastic material.

The present invention will be explained below based on examples.
FIG. 1 shows an embodiment of the present invention, which is implemented in a press molding machine for press molding a sheet-like plastic material. The press forming machine 1 is a hydraulic press with a predetermined high output and long stroke.
Pressure cylinder 3 with large output and long stroke required for
One or more slides 4 are arranged so that the slides 4 can be moved up and down toward the bed 5 at the bottom. At the four longitudinal corners of the lower bed 5, a position detector 6 such as a linear scale is installed, and a balance support device 8 such as a hydraulic cylinder whose position and speed are controlled by a hydraulic servo valve 7 is installed. are arranged vertically, and the position detected by the position detector 6 is fed back to perform highly accurate synchronized control of speed and position. This balance support device 8
It has a small output of about 1/2 to 1/5 of that of the pressure cylinder 3, and has a stroke that moves the plastic material 9 such as a sheet-like resin plate to the upper mold 11 of the mold 10.
A predetermined cavity 13 formed by the lower mold 12 and the lower mold 12
This is a short range necessary for fluid filling and pressure molding, and the descended slide 4 is balanced and supported with an accuracy of within 5/100 mm during press molding. Spherical supports 14 are disposed at the upper ends of the balance support devices 8, respectively. As shown in FIG. 2, the spherical support 14 has a concave portion 15 on the bottom surface fitted into a stepped protrusion 16 provided at the center of the upper end of the balance support device 8, and is removably attached to a fixing device such as a bolt (not shown). It is fixed through the The spherical supporter 14 also includes a lower spherical support member 18 having a concave spherical surface 17 that is spherically concave downward in the center portion, and a convex spherical surface 19 that protrudes spherically downward in the center portion, as shown in the figure. an upper spherical support member 20 having a concave spherical surface 1;
A convex spherical surface 19 is slidably joined to 7 to form a pair, and the support portion 2 on the flat upper surface of the upper spherical support member 20
1 with a predetermined supported portion 22 of the slide 4,
It is supported on a spherical surface so that it can be raised and lowered. As shown in FIG. 2, the upper spherical support member 20 has mounting holes 23 formed axially symmetrically on the side circumference, and is lowered with a mounting tool 25 such as a bolt through an elastic material 24 such as a disc spring. It is coupled elastically to the side spherical support member 18 in a pairwise manner. Reference numeral 26 designates a spacer mounting hole for adjusting the height so that the height of the balance support device 8 can be adjusted according to the size of the molded product, 27 designates a sealing groove, and 28 designates a sealing material such as an O-ring.

Then, the plastic material 9 in a predetermined softened state is placed on the lower mold 12, the pressure cylinder 3 is pressed, the slide 4 is lowered, and the plastic material 9 is gently placed on the balance support device 8. The slide 4 is supported by the balance support device 8 via the pair of spherical supports 14 by contacting the supported portion 22 on the lower surface with the flat support portions 21 of the pair of spherical supports 14, and is supported by the balance support device 8 via the pair of spherical supports 14. Based on the control, the balance support device 8 is synchronously lowered, so that the slide 4 is constantly brought into contact with the spherical support 14 fixed to the balance support device 8 and is lowered to follow. Because the slide is supported by a balance support device via a pair of spherical supports, it is raised and lowered, so there is no risk of damage due to distortion of the frame such as press-molded uprights, deflection of the slide, or tilting of the slide in the front/back and left/right directions. Therefore, even if the supported part of the slide is displaced as shown by the dashed-dot line in Figure 3, the upper spherical support of the spherical supporter will respond to the displacement and shift to the concave spherical surface of the lower support as shown in Figure 3. It connects and rotates, and is supported by a balance support device without the generation of horizontal force. In addition, even if the slide is displaced, the slide is supported by contacting a spherical supporter that is separate from the slide, so the load applied to the balance support device is only a small amount of deviation from the predetermined center of pressure, and the balance support Abrasion caused by force couples and sliding resistance on the sliding surface of the device can be kept extremely small, and even in heavy-load press forming, the balance support accuracy of the balance support device can be maintained at a high level of accuracy and durability is increased. It is something that can be done.

In addition, if the molded product is tall, as shown in FIG. The slide 4 is supported by appropriately mounting one or more adjustment spacers 31. At this time, if a height adjustment spacer attachment hole is provided in the upper spherical support member as shown in the figure, the fitting protrusion of the height adjustment spacer can be fitted to prevent it from sliding down. It is something that can be easily mounted.

In addition, in this example, since the upper support member is attached to the lower spherical support member through the elastic material, the spherical support member can be stably fixed to the balance support device, and each time press forming is completed, The upper spherical support member can be automatically rotated back and lubricating oil can be automatically applied to the sliding surface, making the sliding movement smoother and reducing wear. Although a sealing material is provided around the side circumference of the spherical supporter to prevent dirt and dust from entering, it can also be protected by covering with a side cover or the like.

Further, in the above embodiment, the spherical support is fixed to the balance support device, but it can also be fixed to the supported part of the upper slide. In this case, if the balance support device is fixed as close as possible to the lower end surface of the slide, the amount of deviation of the balance support device fixed to the bed side, which is more rigid, can be further reduced, and accuracy can be improved.

In addition, in the above embodiment, the upper mold was supported in equilibrium via a slide for press forming, but in the case of a mold that is mounted on a bolster and can be freely conveyed, an equilibrium support device may be attached to the bolster. It can also be mounted on a tower to support the side periphery of the upper mold for balanced support.

In the above embodiments, a sheet-like plastic material is simply fed to a press molding machine and press-formed. This can also be applied to products that are fed into a machine and press-formed.

As described above, in the present invention, even if the supported part such as the slide is displaced due to distortion of the frame of the press molding machine, deflection of the slide, or tilting of the slide in the front-rear, left-right direction, the balance support device The load applied to the sliding surface of the machine can be minimized, the balance support device can be operated with high durability and high accuracy, and molded products made of plastic materials can be precisely molded.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side sectional view of the entire press forming machine according to an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the balance support section of the same, and Fig. 3 is an enlarged view of the same for explaining the operation. FIG. 4 is an enlarged side sectional view of another usage example same as above. 1...Press molding machine, 4...Slide, 5...
Bed, 8... Balance support device, 9... Plastic material, 10... Mold, 14... Spherical support device.

Claims (1)

[Scope of utility model registration request] A pair of spherical supports with joined spherical seats are used in a press molding machine for plastic materials that precisely supports the slide in equilibrium via a balance support device installed in the bed part and presses and fluidizes the plastic material into a predetermined mold. is fixed to either the support part at the upper end of the balance support device or the supported part at the bottom end of the slide, etc. supported by this support part, and the slide, etc. is balanced on the balance support device via a pair of spherical supports. A balance support device for press molding of a plastic material, characterized in that it is formed to be freely supported.