JPH03140217A - Pressing equipment of resin material such as smc or the like - Google Patents

Abstract

PURPOSE:To press mold a resin material such as SMC or the like maintaining a high quality by a method wherein the lengths of respective pressurizing rods, which are axially symmetrically provided so as to be able to clamp and release a mold assembly through a slide in equilibrium, are made to be adjustable with a projection adjusting device. CONSTITUTION:Under the condition that a mold assembly 7 is clamped by lowering a slide 5 with an approaching and raising cylinder, a projection adjusting device 14 is driven so as to project respective pressurizing rods 13. After that, the tip of each pressurizing rod 13 is abutted against a keep plate 23, which locates on the top surface of the slide and pressurizing rod insertion holes 22 of which are closed, so as to set the projected length (or the height of a die on the basis of the mold assembly 7) of each pressurizing rod 13 for pressing. After the forming of material 11, a top force 8 is raised in equilibrium through the slide 5 with mold releasing cylinders 26 for releasing a formed item from the forces. After that, by opening the keep plate 23, the slide 5 is raised with the approaching and raising cylinder in order to take the formed item out of the forces.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a press molding apparatus for resin materials such as SMC,
In particular, the present invention relates to a press molding apparatus for resin materials such as SMC, which has a function for maintaining mold equilibrium and adjusting die-hide in a part of the pressurizing cylinder.

BACKGROUND ART In press molding of resin materials such as SMC, it is important to uniformly fluidly fill the mold with the resin material. The fluid filling of the resin material into the mold is performed with a short stroke necessary for clamping the molding material. Therefore, the pressure cylinder that lifts and lowers the slide to apply pressure can have a short stroke, but since press molding using various mold devices is required depending on the product type, the stroke of the slide also has a long stroke. is required.

Under these circumstances, various short stroke press forming apparatuses have been proposed.

For example, the slide of a press molding device is driven up and down by an auxiliary cylinder with a low output and long stroke, and just before the slide is pressurized and lowered, the auxiliary cylinder with a low output and long stroke is switched to the pressurizing cylinder with a high output and short stroke. Things, etc.

Problems to be Solved by the Invention However, in order to switch from a small output, long stroke auxiliary cylinder to a high output, short stroke pressurizing cylinder, it is necessary to fix a half nut to engage and disengage the rod of the pressurizing cylinder from a sliding part, etc. A mechanism or friction lock fixing mechanism is required. In addition, it was necessary to install a special die-hide adjustment device in order to properly pressurize the slide with a high-output, small-stroke pressurizing cylinder to accommodate various types of mold equipment.

Therefore, the press molding equipment became complicated and expensive, and it was not easy to adjust the die-hide.

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 slide of a hydraulic press device is lowered,
A pressure cylinder for pressing and press forming is arranged axially symmetrically with respect to the slide part, and a pressure rod for sliding pressure is protruded by a predetermined amount using a protrusion amount adjustment device from the piston rod part of the pressure cylinder. , or retractable, and the length of each pressurizing rod arranged axially symmetrically so that the mold device can be equilibratedly clamped or released via a slide can be adjusted using the above-mentioned protrusion adjustment device. An object of the present invention is to provide a press molding apparatus for a resin material such as SMC, which is characterized in that the present invention is formed by molding a resin material such as SMC.

According to the present invention, the slide can be pressurized axially symmetrically with the pressurizing cylinder disposed axially symmetrically with respect to the slide portion, thereby performing mold clamping and mold release of the mold device.

Further, by using the protrusion amount adjusting device to protrude or retract the pressurizing rod by a predetermined amount from the piston rod portion of the pressurizing cylinder, die-high illumination adjustment of various mold devices can be easily performed.

Further, by adjusting the lengths of the pressure rods disposed axially symmetrically using the protrusion amount adjusting device, the mold can be clamped and released in an even manner via the slide.

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

FIG. 1 and subsequent figures show an embodiment of the present invention. The press forming device 1 is of a hydraulic press type, and as shown in Fig. F, a slide 5 of required rigidity is placed in the center surrounded by a crown 2, an upright 3, and a bed 4, and the pressure can be freely controlled by a pressure cylinder 6. Place the upper mold 8 of the mold bag W7 on the lower surface of the slide 5,
The lower mold 10 of the mold device 7 is attached to the upper surface of the bed 4 via the bolster 9 etc., and the molding material 11 of sheet-like resin material such as SMC charged between the mold devices 7 is pressed. It is made to be moldable.

As shown in the figure, the pressurizing cylinder 6 is disposed in the crown 2 part in an axially symmetrical manner (4 cylinders symmetrically in the left and right, front and back in the figure) on the slide 5 part, and the piston rod 12 is of a ram cylinder type.
A pressure rod 13 for pressurizing the slide 5 protrudes from the center of the slide 5 and is retractably attached thereto. A protrusion amount adjusting device 14 is disposed at the lower part of the piston rod 12 to adjust the protrusion amount of the pressure rod 13 in accordance with the mold device 7, and to support the slide 5 in equilibrium to support the mold device. The lengths of the pressure rods 13 disposed axially symmetrically can be adjusted so that the upper mold 8 of the mold 7 is clamped and released from the lower mold 10 in an equilibrium manner.

As shown in FIG.
3 is rotatably engaged with a screw 15 such as a ball screw or square screw, and a gear 16 is attached to the lower periphery of the piston rod 12, and an oil equipped with a position detector such as an encoder is attached to the outer periphery of the gear 16. Pivotally attached to a drive device 17 such as a motor (spline joints can be used if necessary)
The pinion gear 18 is engaged, and the gear 16 is rotated a predetermined number of times under the drive control of the drive device 17, so that the pressurizing rod 13 can be extended or retracted by a predetermined amount as described above. 19 is a lifting cylinder that is attached to the piston rod 12 whose upper end side protrudes from the upper part of the pressurizing cylinder 6 and lifts the piston rod 12 upward;
0 is a servo valve for lowering and pressurizing the pressurizing cylinder 6, and 21 is a hydraulic power source.

The slide 5, which is pressurized downward by the pressure rod 13 of the pressure cylinder 6 formed in this way, is provided with a pressure rod insertion hole 22 as shown in FIGS. 1 and 2, and as shown in FIG. As shown in FIG.
It is arranged so that it can be opened and closed freely.

Then, when the key plate 23 is opened, the pressure rod 13 is inserted into the pressure rod insertion hole 22 of the slide 5 as shown in the right half of FIG. 1, so that the slide 5 can be raised upward. When the key plate 23 is closed, the tip of the pressure rod 13 is brought into contact with the key plate 23 as shown in the left half of FIG. . 25 is a key plate stopper, 26 is a release cylinder attached to the bed 4, and the tip of the rod 27 is fixed to the lower surface of the slide 5 to push the slide 5 up.

The press molding apparatus 1 configured in this way has, for example, a first
As shown in the left half of the figure, with the slide 5 lowered by an approach/lift cylinder (not shown) and the mold device 7 clamped, the protrusion amount adjusting device 14 is driven to adjust the pressure rod 13. The tips of the pressure rods 13 are brought into contact with the key plate 23 that closes the pressure rod insertion holes 22 on the upper surface of the slide 5, and the length of the protrusion of each pressure rod 13 (the amount of die hydride relative to the mold device 7) is determined. Settings are made and press molding is performed.

Therefore, there is no need for a half-nut fixing mechanism or a friction lock fixing mechanism on the crown portion or the like, and there is no need to specially provide a die-hide adjustment device that is difficult to set.

Note that the press forming using the pressurized cylinder 6 is performed using an encoder detector or the like (not shown) attached vertically to the side of the upright 3 or the bottom surface of the slide 5 to freely detect the lowered position of the slide 5. The positions of the slides 5 are controlled by the servo valves 20 respectively, and the upper mold 8 is lowered in a balanced manner relative to the lower mold 10 to uniformly fluidly fill the mold cavity.

Then, at an appropriate point in the reaction molding process in which the molding material 11 hardens, contracts, and expands as the slide 5 descends, the pressurizing cylinder 6
is switched to pressure control at a predetermined pressing force, the molding material 11 is sufficiently filled into the mold cavity while maintaining the pressure balance, is cured, and is press-molded by holding the pressure for a certain period of time. After molding, the mold release cylinder 26 lifts the upper mold 8 in equilibrium through the slide 5 to release the mold, and the key plate 23 is opened and the approach/lift cylinder (not shown) moves the upper mold 8 to the slide 5.
The molded product is taken out by raising the molded product, and then molded one after another.

In the embodiment, the pressure rod of the pressure cylinder is inserted into the slide, the slide is lowered through the key plate,
Since it is possible to pressurize, there is no need for the pressurizing cylinder to have a long stroke that follows the rise and fall of the slide like in the past (this makes it possible to pressurize the mold device in the clamped state and perform press forming. It has the advantage of being able to have a relatively short stroke range and improving machining accuracy and response speed due to the compressibility of the hydraulic oil.

In the above embodiment, the pressurizing cylinder is disposed at the crown portion, but the present invention can also be applied to a press molding apparatus in which the pressurizing cylinder is disposed on the bed side and the slide is pressurized from below.

Furthermore, in the above embodiment, four pressurizing cylinders are arranged axially symmetrically on the slide, but an appropriate number may be arranged axially symmetrically on the slide depending on the size of the press forming apparatus. It is also possible.

Note that the molding material is not limited to SMC materials, but can also be resin materials reinforced with glass fibers, metal fibers, etc. In addition to the sheet materials mentioned above, gel-like fluid materials can also be used. It is something.

Effects of the Invention As described above, in the present invention, the pressurizing rod of the pressurizing cylinder arranged axially symmetrically with respect to the slide can be protruded and retracted by the protrusion amount adjusting device, so that it can be applied to various molds. Die-hide adjustment can be easily performed without adding a special die-hide adjustment device to the equipment, and the length of each pressurizing rod can be adjusted using a part of the pressurizing cylinder. Clamp the device evenly,
It can be released from the mold, and resin materials such as SMC can be press-molded with good quality.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal half sectional view of one embodiment of the present invention, and FIG. 2 is a partially omitted plan sectional view of the same sliding portion. l...Press molding device, 5...Slide, 6...
Pressure cylinder + J cylinder 12... Piston rod, 13...
- Pressure rod, 14... protrusion amount adjustment device.

Claims (1)

[Claims] (1) The slide of the hydraulic press device is lowered, and a pressure cylinder for applying pressure and press forming is arranged axially symmetrically with respect to the slide part, and a slide pressure cylinder is attached to the piston rod part of the pressure cylinder. Each pressurizing rod is arranged so that it can be protruded or retracted by a predetermined amount using a protrusion adjustment device, and each pressurizing rod is arranged axially symmetrically so that the mold device can be clamped or released in equilibrium via a slide. A press molding apparatus for a resin material such as SMC, characterized in that the length of the protrusion can be freely adjusted using the protrusion amount adjusting device.