JPS6234700A - Press forming device for composite resin plate or the like - Google Patents

Abstract

PURPOSE:To minimize the influence of the compressibility of hydraulic fluid and to permit the control of the balanced support of a slide with high accuracy by moving rods for expelling the hydraulic fluid upward and downward to maintain the volume of the hydraulic fluid for supporting rods which support the slide in balance for a long stroke at the small volume. CONSTITUTION:Balanced supporting devices 7, 7 consisting of hydraulic cylinders having the supporting rods 8 to be moved upward and downward by hydraulic servocontrol valves 9 to a head 4 are disposed to a press device which lowers the slide 5 attached with an upper die 11 by a pressurizing cylinder 6 and presses a composite resin plate, etc. 23 imposed on a lower die 22 on a bolster 21..The slide 5 is supported in balance by the rods 8 over the long stroke according to the sized of the dies 11, 22. The rods 13 for expelling the hydraulic fluid are provided into a box-shaped body 12 attached to the bed 4 and are actuated via reduction gears 14 by driving mechanisms (not shown) so as to move upward and downward in the cylinder by following up the stroke of the rods 8 detected by position detectors 10. The volume of the hydraulic fluid in the cylinder is thereby maintained at the extremely small volume.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a press molding apparatus for composite resin plates and the like.

BACKGROUND ART In press molding composite resin plates such as FRP and SMC, it is necessary to control the slide to descend in a balanced manner with high precision due to the rapid hardening properties of the composite resin material. For this reason, in conventional press forming methods using long pressurizing cylinders, the amount of compression of hydraulic oil is large, making it difficult to control the slide downwards with high accuracy, and the sudden drop occurs during pressurization. It has been impossible to mold a hardening composite resin material into a desired uniform, thin-walled press-molded product.

Therefore, the applicant has developed a press device in which a hydraulic servo cylinder balance support device is installed at the four corners of the bed, and the descending slide can be balanced and supported within the range necessary for press molding of composite resin plates, with high precision. We have succeeded in forming excellent press-formed products by controlling speed and position.

Problems to be Solved by the Invention However, when press-molding a wide variety of molded parts, the sizes of the molds vary, and in order to adjust the thickness of the mold, it is necessary to support the slide of the above-mentioned balance support device. The height had to be adjusted by stacking specified leveling blocks on the rod.

Means for Solving the Problems The present invention has been developed in view of the above-mentioned problems, and the support rods of the balance support device that balances the slide are formed so as to be able to rise and fall freely over a long stroke, so that the support rods can be moved up and down over a long stroke. In order to reduce the volume of hydraulic oil on the bottom side of the balance support device, which supports the slide by protruding the support rod upward, a rod for removing hydraulic oil is installed to adjust the thickness of the support rod. Correspondingly, interpolate each one in a followable manner,
The support rod of the balance support device of the hydraulic servo cylinder is formed with a long stroke, so that mold thickness can be easily adjusted to accommodate large and small molds, and the slide can be supported in balance, and the support rod of the balance support device has a long stroke. Despite this, it is possible to maintain a small amount of hydraulic oil in the balance support device, minimize the influence of the compressibility of hydraulic oil, and achieve high-precision speed and position control, resulting in uniform and thin-walled, high-quality products. An object of the present invention is to provide a press-molding apparatus for composite resin plates, etc., which can form press-molded products.

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
consists of a hydraulic press, and as shown in Figure 1, a slide 5 of the required rigidity is installed in the center surrounded by a crown 2, an amplifier light 3, and a bed 4, and the slide 5 is pressed by a pressure cylinder 6 at the top. It is arranged so that it can be freely driven up and down toward the bed 4 at the bottom. In the lower bed 4, a balance support device 7 such as a hydraulic servo cylinder that supports the slide 5 in balance is installed in the four corners of the work surface of the bed 4 with its lower part buried within the bed 4. ing. The balance support device 7 includes a sufficiently rigid support rod 8 that can be raised and lowered over a long stroke of 0 to 150 (In), and is lowered and lowered via a hydraulic servo valve 9 and a position detector 10 such as a linear scale. The slide 5 is directly supported with high accuracy, and the slide 5 can be freely and balancedly supported to accommodate large and small molds 11 without mounting a leveling block for mold thickness adjustment on the support rod 8, making it easy to mold. The thickness can be adjusted.At the bottom of the long-stroke balance support device 7,
As shown in FIG. 2, a box-shaped body 12 is provided protrudingly like a composite cylinder, and a hydraulic oil removal rod 13 having approximately the same diameter as the support rod 8 is installed inside the box-shaped body 12, and the upper part is provided with a balance support device. 7.Hydraulic oil removal rod 1
3 has a threaded lower part as shown in FIG.
As shown in the figure, a worm screw 16 is engaged with 5 so that it can rotate freely, and a transmission device 17 such as a miter gear is connected to each of the worm screws 16 so as to freely transmit rotation, and an exclusion rod drive device such as a hydraulic pressure monitor is connected to the worm screw 16. It is connected to 18. Then, following the lifting and lowering of the support rod 8, the drive is controlled to move up and down to the bottom side of the balance support device 7 via a height detector 19 such as an encoder, and the press forming is balanced and supported by the compressibility of hydraulic oil. Precision is not an issue.

For example, the reduced capacity of hydraulic oil on the bottom side of the balance support device 7 is l to 2j! Of course, it can be adjusted to below tens of ml! It can be freely adjusted from 1 to several hundred meters. - Function: The upper mold 20 of the required mold 11 is fixed to the slide 5, and the lower mold 22 is fixed to the bolster 21, and the balance support device 7 is raised and lowered to form the slide 5 according to the dimensions of the mold 11. This is to adjust the support height and mold thickness. For example, if the mold 11 is large as shown in FIG. 1 and the slide 5 must be supported from a slightly higher height, the balance support device 7 is driven to raise the support rod 8 to a predetermined height. This allows the slide 5 to be supported in a balanced manner. Furthermore, when the mold 11 is small and the slide 5 needs to be supported from a low place, the support rod 8 is lowered by a predetermined amount, contrary to the above, to support the slide 5 in equilibrium from a low place. At this time, as the support rod 8 moves up and down, the position detector 10 and the height detector 19 are interlocked and the removal rod drive device 18 controls the drive of the transmission device 17, the worm screw 16 of the reducer 14, and the worm wheel 15. is rotated to drive the hydraulic oil removal rod 13 to maintain the volume of hydraulic oil on the bottom side of the balance support device 7 so that it does not increase beyond a predetermined amount. In this way, the mold thickness is adjusted by the equilibrium support device 7 in accordance with the dimensions of the mold 11, the slide 5 is lowered, and the composite resin plate 23 is controlled by the program control inputting the required speed control command and pressure control command. The balance support devices 7 are each controlled in synchronized balance, the pressure cylinder 6 is controlled in speed and the slide 5 is lowered in balance, the composite resin plate 23 is flow-filled into a predetermined cavity 24 of the mold 11, and the pressure cylinder 6 is Pressure is applied and press-formed in sequence based on program control.

In this way, the support rod of the balance support device, which supports the slide in balance according to the size of the mold, can be raised and lowered to a sufficient height, making it easy to adjust the mold thickness without using a leveling block. In addition, even if the stroke of the hydraulic servo cylinder of the balance support device is long as described above, the hydraulic oil is kept in a small amount by raising and lowering the hydraulic oil removal rod so as not to affect the compressibility of the hydraulic oil of the balance support device. Because it can be held, it is possible to balance the slide with a positional accuracy within plus or minus 0.05, equivalent to a short stroke balance support device of 100 to 200 m, and it is possible to obtain high-quality press-formed products with uniform and thin wall thickness. It is possible.

The above-mentioned position control of the hydraulic oil removal rod and its parallel control only require that the compressibility of the hydraulic oil does not affect the press control, so it is usually sufficient to control the drive of each crane, which is easy to control. However, it is also possible to perform even more precise tuning control by increasing the diameter of the rond and increasing the accuracy of position control and tuning control.

In addition, in the above embodiment, the hydraulic oil removal rod was made to protrude from the bottom of the balance support device, but it is formed inside the support rod of the balance support device so that it can freely protrude from the bottom portion.
It is also possible to remove hydraulic oil in the same way as above. Further, as the press molding material, in addition to the above-mentioned plate-like materials, fluid materials such as bulk materials can also be used.

Effects of the Invention As described above, in the present invention, the balance support device can be driven up and down over a long stroke to support the slide in balance, and a leveling block can be mounted on the balance support device for molds of various sizes. The mold thickness can be easily adjusted without having to do so. In addition, even if the balance support device of the hydraulic servo cylinder is configured to have a long stroke in this way, the amount of hydraulic oil in the balance support device can be maintained at a small amount by following the hydraulic oil removal rod, minimizing the influence of the compressibility of the hydraulic oil. The slide can be balanced and supported with high precision and can be press-formed.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted front sectional view of an embodiment of the present invention, and FIG. 2 is a partially omitted side sectional view of the same balance support device. DESCRIPTION OF SYMBOLS 1... Press device, 4... Bed, 5... Slide, 7... Balance support device, 8... Support rod, 11
...Mold, 13...Hydraulic oil exclusion rod. Applicant Kawasaki Oil Industries Co., Ltd. Agent Patent Attorney Kuni Morimoto Figure 1

Claims (1)

[Claims] (1) In a press-forming machine for press-molding composite resin plates, etc., a balance support device of a hydraulic servo cylinder that supports the slide in precise balance is installed in the corner of the bed of the press machine for press-forming composite resin plates, etc. The bottom side of the above-mentioned balance support device, in which the support rods of the support device are formed to be able to rise and fall freely over a long stroke, so that the mold thickness can be adjusted for high and low molds, and the support rods are protruded upward to support the slide. 1. A press-forming device for composite resin plates, etc., characterized in that rods for removing hydraulic oil are inserted so as to freely follow the lifting and lowering of a support rod in order to reduce the volume of hydraulic oil.