JP2626725B2 - Plastic material molding press control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a molding press of a plastic material, and more particularly to a method of constantly moving a slide from a balancing support device in response to a change in the type of molding material or a setting of a pressing speed. The present invention relates to a molding press control method for a plastic material which can be press-formed while being supported in a balanced manner.

2. Description of the Related Art Conventionally, in press molding of a plastic material, an apparatus that equips a bed portion with an equilibrium support device, supports a slide in equilibrium, and press-molds a molded product with a uniform thickness has been used.

Problems to be Solved by the Invention However, the above-mentioned method of press-molding a plastic material controls the position and speed of each of the leveling cylinders at the four corners of the equilibrium support device of the bed,
The slide was controlled by feeding back the supporting force of the leveling cylinder to the pressure cylinder side of the slide via a servo pump, so to speak, a leveling cylinder speed-driven system.

As a result, the slide speed control accuracy can be obtained with high accuracy.However, when molding very high-viscosity plastic materials at high speed, the slide cannot follow the leveling cylinder and the slide is leveled. The phenomenon that the cylinder is separated from the cylinder occurs, so that the equilibrium support device cannot be used effectively.

Further, in the case of molding only one side in a two-cavity or four-cavity mold apparatus, the slide cannot be maintained at a certain equilibrium 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, an equilibrium support device is disposed at a corner of a bed of a press device to equilibrate a slide. In a plastic material molding press control method for molding by pressing the plastic material loaded in the mold apparatus at an equilibrium, a pair of pressure cylinders are disposed symmetrically on the crown portion, and The pressurizing cylinder on the low-pressure side of the pressure cylinder follows the press forming speed of the high-pressure side pressurizing cylinder and synchronizes to control the slide through the equilibrium support device and is pressurized through the slide. To provide a method for controlling a press for molding a plastic material, characterized in that the equilibrium support device is controlled so that the total support force of the leveling cylinder of the equilibrium support device is constant. is there.

According to the present invention, by controlling the equilibrium support device so that the total supporting force of the leveling cylinder of the equilibrium support device is constant, the slide can always be kept in a pressurized state by the equilibrium support device, and the slide is equilibrium supported. It can be supported without leaving the device. Also, by controlling the pressurizing cylinder on the low pressure side of the pressurizing cylinder to follow the press forming speed of the pressurizing cylinder on the high pressure side and controlling the slides to be equilibrium supported by the equilibrium support device, even plastics with very high viscosity Even if it is a material, the slide can be press-formed at a high speed without separating from the equilibrium support device. In a two- or four-cavity mold device, even if only one side is molded, the eccentric load can be reduced. The slide can be maintained at a certain equilibrium accuracy regardless of its size and can be press-formed.

Examples Hereinafter, the present invention will be described based on examples. The press device 1 is of a hydraulic press. As shown in FIG. 1, a required rigid slide 5 is provided at a central portion surrounded by a crown 2, an upright 3, and a bed 4, and a pressure cylinder 6 is provided at the crown 2 portion. The pressure cylinder 6 is freely driven by a hydraulic servo pump 8 of a hydraulic power source 7 so that the slide 5 is slidable toward the lower bed 4. A position detector 9 such as a linear scale is disposed on the side of the slide 5 so as to detect the position of the slide 5 and to perform a slide speed-driven press forming as described later. On the lower surface of the slide 5 and the upper surface of the bed 4, an upper mold 10 and a lower mold 11 for press-forming required parts are arranged facing each other as shown in FIG. Sheet-shaped plastic material 13 on lower mold 11
Is loaded and molded. At the four corners of the bed 4, equilibrium support devices 15 with leveling cylinders 14 such as hydraulic servo cylinders are provided, and the four corners on the lower surface of the slide 5 are equilibrium supported to precisely slide the slide 5. The support can be controlled horizontally.

Further, two pressure cylinders 6 are arranged symmetrically on the crown portion 2 in correspondence with the two-piece or four-piece mold device 12. Then, while controlling the supporting force of the leveling cylinder 14 to be constant as described above, the pressure cylinder 6 on the low pressure side of the two pressure cylinders 6 disposed on the crown 2 is pressurized on the high pressure side. Synchronous control is performed following the cylinder 6.

The control of the silide 5 and the equilibrium support device 15 is performed by using a pressure detector 16 to detect a support force, which is a reaction force of the four leveling cylinders 14 of the equilibrium support device 15 generated when the slide 5 is pressurized. Sum as shown in the block diagram of FIG.
The supporting force is made to be constant as compared with the set value of the reference register 17. The four leveling cylinders 14
Is set so that one leveling cylinder is used as a reference axis, and the other three leveling cylinders 14 follow and synchronize with this.

As described above, the supporting force of the equilibrium support device 15 pressurized by the slide 5 is controlled to be constant, and the pressing force and the pressing speed of the pressurizing cylinder 6 are controlled via the control device 18 as shown in FIG. Is set on the slide 5 and the plastic material 13 is press-formed.

Therefore, even when a high-viscosity plastic material is molded at a high speed, since the pressing speed is set on the slide side, the slide can follow the balance supporting device without separating.

Further, in a two-cavity or four-cavity mold device, even if molding is performed on only one side, the slide can be held with constant parallel accuracy regardless of the magnitude of the eccentric load. It can be pressed and formed without separation.

In the above embodiments, the plastic material has been described. However, the present invention can be similarly applied to a plastic material including a reinforcing material such as SMC.

Effect of the Invention As described above, in the present invention, in a two-cavity or four-cavity mold device, even if molding is performed on only one side, the slide can be maintained at a constant balance accuracy regardless of the magnitude of the eccentric load, Also, even with very viscous plastic materials, the slide can be pressed at high speed without leaving the slide from the equilibrium support device. And since the equilibrium support device was controlled so that the total support force of the leveling cylinder of the equilibrium support device pressurized through the slide was constant,
The slide can always be pressed to the equilibrium support device, and the slide can be supported without separating from the equilibrium support device and press-formed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of one embodiment of the present invention, FIG. 2 is a block diagram of the equilibrium cylinder device of the above, and FIG. 3 is a block diagram showing a control method of the same. 1 ... Press equipment, 4 ... Bed, 5 ... Slide, 6
…… Pressure cylinder, 13 …… Plastic material, 14 ……
Leveling cylinder, 15 ... equilibrium support device.

Claims (1)

(57) [Claims] 1. A plastic material which is disposed at a corner of a head portion of a press device and is controlled so as to equilibrately support a slide, and pressurizes and equilibrates a plastic material loaded in a mold device. In the molding press control method, a pair of pressure cylinders are disposed symmetrically on the crown portion, and the pressure cylinder on the low pressure side of the pressure cylinder follows the press molding speed of the pressure cylinder on the high pressure side. Synchronously controlling the equilibrium support of the slide via the equilibrium support device and controlling the equilibrium support device so that the total supporting force of the leveling cylinder of the equilibrium support device pressurized via the slide becomes constant. A method for controlling a molding press of a plastic material, characterized in that: