JPH01208111A - Press molding device for composite resin material - Google Patents

Abstract

PURPOSE:To obtain a press molding device which is can shorten molding time with high accuracy by a method wherein an upper slide is lowered by a molding cylinder of high output and a long stroke, pressed against an adjustable stoppers and a lower slide is pushed up by a pressure cylinder of smaller output and shorter stroke than those of the upper slide. CONSTITUTION:A crown 2 and bed 3 are connected with four corner parts through a tie rod 4 and an upper slide 5 is fitted over the tie rod ascendingly and descendingly. The upper slide 5 is made slidable along the tie rod 4 by a pair of hydraulic moving cylinders 7 of high output and a long stroke, which are stuck close to a crown 2 part. On the other hand, a pressure cylinder 14 of a large diameter, large output and a short stroke is laid under the lower slide 6 fitted to a bed 3 part under a state where balance holding is possible in axis symmetry. The top parts of the pressure cylinders 14 are laid respectively on the lower slide 6 ad the lower slide 6 is made ascendable and descendable at a short stroke. Then the upper slide 5 is stopped by a stopper 9 by lowering the upper slide 5 at a high speed and then the lower slide 6 is raised. With this construction, press molding can be performed at favorable accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hydraulic press device, and more particularly to a press molding device for composite resin materials.

Conventional technology In recent years, press molding of composite resin materials such as SMC has become popular, but conventional press equipment usually has a high-output, long-stroke pressure cylinder installed in the crown part, and press molding of composite resin materials such as SMC has become popular. The mold was clamped by lowering the slide at high speed according to the dimensions of the mold for the molded product, and from a predetermined position, the slide was switched to lowering speed at low speed to perform pressure molding. However, during pressure molding, there is a limit to accuracy due to the compressibility of the oil in the long stroke pressure cylinder.

In addition, the press device is provided with an upper slide and a lower slide that can be moved up and down, the upper slide is fixed at a position near the die height by a clamp device, and the lower slide is pushed up by a pressure cylinder to press-form the molding material. There are also known press devices that reduce molding time and improve the accuracy of press molding.

Problems to be Solved by the Invention However, in practice, the upper slide must be firmly and precisely fixed in the vicinity of the die height, so the clamping device is complicated, and it is difficult to accurately position the upper slide. It was difficult to press-form the material with uniform precision.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems.In order to solve the above-mentioned problems, a hydraulic press device is constructed by connecting the crown and the bed with tie rods to separate the upper slide and the lower slide. are arranged vertically facing each other, the upper slide has a high output, is movable by a long stroke moving cylinder, and the lower slide has a high output, which is slightly smaller than the upper slide.
A press-forming cylinder with a short stroke is used to move up and down, and a nut-shaped adjustable stopper is screwed near the die height of the tie rod so that the upper slide can come into contact with and stop freely, creating an adjustable stone bar. A press for composite resin material, etc., characterized in that the molding material, such as composite resin material, is formed so that it can be press-molded by pushing up the lower slide opposite to the upper slide stopped at and loading the molds of the upper slide and lower slide. To provide molding equipment.

According to the present invention, the upper slide is moved down to a position near the die height by lowering the upper slide using a high-output, long-stroke moving cylinder and pressing it against an adjustable stopper screwed onto the tie rod connecting the crown and the bed. It can be used by fixing it accurately. In addition, by pushing up the lower slide with a pressure cylinder with a high output and short stroke that is slightly smaller than the upper slide, the composite resin molding material loaded into the mold can be easily removed by the upper slide and the lower slide. Can be press-formed with high precision.

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

FIG. 1 and subsequent figures show an embodiment of the present invention. Press device 1
is a hydraulic press, and as shown in Figs. 1 and 2, the crown 2 and the bed 3 are connected via tie rods 4 at some of the four corners, and the upper slide 5 is attached to the tie rods 4 so as to be movable up and down. At the same time, a lower slide 6 is attached to the bed 3 portion so as to be able to rise and fall freely, and is pressable. As shown in FIGS. 1 and 2, the upper slide 5 is slidable along the tie rod 4 by a pair of high-output, long-stroke hydraulic moving cylinders 7 fixed to the crown 2, and the upper slide 5 is made to slide freely along the tie rod 4. It can be freely stopped by coming into contact with a nut-shaped adjustable stopper 9 screwed into a square threaded part 8 bored in the part. As mentioned above, the assia staff stopper 9 is a threaded body whose central part is screwed into the square threaded part 8,
Worm teeth 10 are bored on the outer periphery of the worm shaft 12, which is the rotating shaft of a position adjustment electric motor 11 with a brake and a speed reducer, which is pivotally connected to the tie rod 4 as shown in FIG. The zero position adjustment electric motor 11, which is engaged with and can be freely driven, is equipped with a rotation speed detector (not shown) like an encoder. can be set at a predetermined die height position by driving the die height up and down.

On the other hand, in the third part of the bed, there is a lower slide 6 as shown in Figure 1.
In addition, four large-diameter, large-output, short-stroke pressurizing cylinders 14, such as hydraulic cylinders, are embedded in an axially symmetrical manner so that the lower slide 6 can be supported in equilibrium, and the upper end of the pressurizing cylinder 14 is attached to the lower slide 6. The lower slide 6 can be moved up and down over a short stroke of 50 to 100 mm. The pressurizing cylinder 14 has a pressing force slightly smaller than that of the moving cylinder 7, and the composite resin is charged into the mold 13 using an upper mold 15 attached to the upper slide 5 and a lower mold 16 attached to the lower slide 6. Material molding material 17
In addition, the pressurizing cylinder 14 is synchronized with a known hydraulic synchronization circuit so as to be able to move up and down freely, so that the molding material 17 can be molded in a good manner. 1B is a retraction cylinder for the upper slide 5.

Therefore, when performing press molding, when the die height position is input in accordance with the mold dimensions, the position adjustment electric motor 11 is activated to drive the adjustable stoppers 9 through the worm shaft 12. It can be set at a predetermined height by turning along the tie rod 4. Then, the moving cylinder 7 is actuated to lower the upper slide 5 at high speed as in the first time, and it comes into contact with the adjustable stopper 9 and stops.Then, the oil pressure is increased and the lower pressurizing cylinder 14 is actuated. Press molding can be performed by raising the lower slide 6.

In this way, because the upper slide is simply pressed against the adjustable stopper, there is no need for any mechanical ramp device as in the past, making it easy to construct a high-output, long-stroke moving cylinder and the hydraulic circuitry required for it. It can be press-formed with a similar structure, and since it can be press-formed with a short stroke of the pressurizing cylinder, it has good responsiveness, shortens the molding time, and has good balance accuracy, increasing the precision of press-forming.

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

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

Although a composite resin material has been described as a molding material, it is also applicable to plastic materials such as synthetic resin materials as appropriate.

Effects of the Invention As described above, in the present invention, the adjustable stopper screwed onto the tie rod can be easily adjusted to correspond to the die height, and the upper slide can be lowered using a moving cylinder to accurately position the adjustable stopper. Can be fixed.

In addition, press forming is performed by pushing up the lower slide with a high-output, short-stroke pressure cylinder facing the fixed upper slide, which improves responsiveness and balance accuracy, resulting in high precision and shortened molding time. It can be made into plastics and press-molded.

[Brief explanation of the drawing]

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 as above. DESCRIPTION OF SYMBOLS 1...Press device, 2...Crown, 3...Bed, 4...Tie rod, 5...Upper slide, 6...
...Lower slide, 7...Movement cylinder, 9...
Adjustable stopper, 13...Mold, 14...
- Pressure cylinder, 17...molding material. Applicant Kawasaki Oil Industries Co., Ltd. Agent Patent Attorney Kuni Morimoto Figure 1 F

Claims (1)

[Claims] (1) A hydraulic press device is connected to the crown and bed using tie rods, and the upper slide and lower slide are arranged vertically facing each other, and the upper slide is movable by a high-output, long-stroke moving cylinder. At the same time, the lower slide is arranged so that it can be raised and lowered by press-forming with a high-output, short-stroke pressure cylinder that is slightly smaller than the upper slide, and a nut-shaped adjustable stopper is screwed to the position near the die height of the tie rod so that its position can be adjusted. The upper slide can be stopped in contact with the adjustable stopper, and the lower slide is opposed to the upper slide stopped by the adjustable stopper and pushed up to form a molding material such as a composite resin loaded into the molds of the upper slide and lower slide so that it can be press-molded. Press molding equipment for composite resin materials, etc., characterized by the following.