JP2602049B2 - Press molding equipment for composite resin materials - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press device, and particularly to a press forming device for a composite resin material or the like.

2. Description of the Related Art In recent years, press molding of composite resin materials such as SMC has become popular. In accordance with the size of the mold corresponding to the molded product, the slide is moved down at a high speed to fasten the mold, and the pressure is formed by switching from a predetermined position to a slow down. However, at the time of pressure molding, there is a limit in accuracy due to the compressibility of oil in a long-stroke pressure cylinder.

Also, the upper slide and the lower slide are arranged in a press device so as to be able to move up and down freely, the upper slide is fixed to a position near the die height by a clamp device, and the lower slide is pressurized and pushed up by a cylinder to press-mold the molding material. There is also known a press apparatus for shortening the molding time and improving the precision of press molding.

However, in practice, since the upper slide must be firmly and accurately fixed to the position near the die height, the clamping device is complicated, it is difficult to accurately position the upper slide, and molding is difficult. It has been difficult to press-mold the material with uniform accuracy.

Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, a hydraulic press device is used to connect a crown and a bed with a tie rod to connect an upper slide and a lower slide. A composite material such as a composite resin material loaded in a mold by pressing the lower slide against the upper slide and pressing the lower slide upward and downward so as to be press-moldable. An object of the present invention is to provide a press forming apparatus.

According to the present invention, the upper slide is lowered near the die height by lowering the upper slide with a large-power, long-stroke moving cylinder, pressing against an adjustable stopper screwed on a tie rod connecting the crown and the bed, and stopping. It can be used by fixing it precisely to the position. In addition, the upper slide and the lower slide push up the lower slide with a large-output, short-stroke pressure cylinder slightly smaller than the upper slide, so that the molding material of the composite resin material loaded in the mold with the upper slide and the lower slide can be easily adjusted. Press forming can be performed with high precision.

Examples Hereinafter, the present invention will be described based on examples.

FIG. 1 et seq. Show one embodiment of the present invention. The press device 1 is of a hydraulic press. As shown in FIGS. 1 and 2, a crown 2 and a bed 3 are tie rods 4 at four corners.
The upper slide 5 is fitted on the tie rod 4 so as to be able to move up and down, and the lower slide 6 is attached to the bed 3 so as to be able to move up and down so as to be pressable.
The upper slide 5 is slidable along the tie rod 4 by a pair of large-output, long-stroke hydraulic moving cylinders 7 fixed to the crown 2 as shown in FIG. The nut-shaped adjustable stopper 9 screwed to the square screw portion 8 is stopped freely. As described above, the adjustable stopper 9 is a screw body whose central portion is screwed to the square screw portion 8 and has a worm tooth 10 formed in the outer peripheral portion thereof. A worm shaft 12, which is a rotating shaft of a position adjusting motor 11 with a speed reducer, is engaged with the worm teeth 10 to be drivable. A rotational speed detector (not shown) such as an encoder is internally provided in the position adjusting motor 11, and the adjustable stopper 9 is driven up and down by a setting input corresponding to the dimensions of the mold 13 to set a predetermined die height position. Can be set to.

On the other hand, a lower slide 6 is mounted on the bed 3 as shown in FIG. 1, and the lower slide 6 can be equilibrium supported so as to be axially symmetrical and have a large diameter and large output like four hydraulic cylinders. A pressurizing cylinder 14 having a stroke is embedded, and the upper end thereof is attached to the lower slide 6 so that the lower slide 6 can be raised and lowered over a short stroke of 50 to 100 mm. The pressurizing cylinder 14 is slightly smaller than the pressing force of the moving cylinder 7, and the upper mold 15 mounted on the upper slide 5 and the lower mold 16 mounted on the lower slide 6 are used as a mold.
Pressing the molding material 17 of the composite resin material to be loaded into 13 and press-molding the same.
17 can be molded with high precision. Reference numeral 18 denotes a pull-back cylinder of the upper slide 5.

Therefore, in the press molding, when the die height position is input in accordance with the dimensions of the mold, the position adjusting motor 11 operates to drive the adjustable stoppers 9 via the worm shaft 12, respectively. It can be turned along the tie rod 4 and set at a predetermined height. Then, the moving cylinder 7 is operated to lower the upper slide 5 at a high speed as shown in FIG. 1 to stop by contacting the adjustable stopper 9, and then increase the oil pressure and operate the lower pressurizing cylinder 14. Press molding can be performed by raising the lower slide 6.

In this way, since the upper slide is simply pressed against the adjustable stopper, there is no need for any mechanical clamping device as in the past, and a large output, long stroke moving cylinder and the necessary hydraulic circuit configuration are simple. The press molding can be performed with a simple structure and the press cylinder can be press-formed with a short stroke, so that the response is good, the molding time can be shortened, the equilibrium precision is good, and the precision of the press molding can be improved.

In particular, in this embodiment, since the position of the adjustable stopper is freely adjustable via the worm shaft on the tie rod, the automatic position adjustment of the die height can be performed in a wide range, and the upper slide can be conveniently positioned.

Further, in the above embodiment, since the moving cylinder is mounted between the tie rods on both sides of the crown portion, the distortion of the crown can be reduced as much as possible, and the accuracy is maintained.

Although the composite resin material has been described as the molding material, a plastic material such as a synthetic resin material can be appropriately applied.

Advantageous Effects of the Invention As described above, in the present invention, the crown and head can be connected by tie rods, but the distortion of the crown can be reduced as much as possible, and the composite resin material in which the upper slide and the lower slide are accurately loaded in the mold. Can be easily and accurately press-formed. In addition, the adjustable stopper screwed to the tie rod can be adjusted up and down easily over a wide range according to the die height, and it has a simple structure with few members. Can be positioned and fixed.

And, in this way, the lower slide is pushed up by a large-output, short-stroke pressurizing cylinder facing the fixed upper slide and press-formed, so that responsiveness is improved, and the equilibrium accuracy is improved. The molding time can be shortened and press molding can be performed.

[Brief description of the drawings]

FIG. 1 is a partially omitted side view of one embodiment of the present invention, and FIG.
The figure is a plan view of the same. 1 ... Pressing device, 2 ... Crown, 3 ... Bed, 4
… Tie rod, 5… Upper slide, 6… Lower slide, 7… Moving cylinder, 9… Adjustable stopper, 13… Mold, 14… Pressure cylinder, 17…
Molding material.

Claims (1)

(57) [Claims] 1. A composite resin loaded in a mold by connecting a crown and a bed with a hydraulic press device by means of a tie rod, an upper slide and a lower slide being arranged vertically, and the upper slide being pushed upward with the lower slide facing each other. In a high-output type composite resin material press molding machine that is capable of press-molding molding materials such as materials, a high-output, long-stroke moving cylinder is attached to the center of the crown and the upper slide is set to a predetermined height. While being movably arranged, large output slightly smaller than the upper slide,
A short-stroke pressurizing cylinder is mounted on the bed so that it can be raised and lowered so that it can be press-molded.A screw is provided near the die height of each of the tie rods. A press forming apparatus for a composite resin material or the like, characterized in that the upper slide can be freely stopped at a predetermined height by being screwed to each other.