JPS60149411A - Movable board sliding apparatus in horizontal mold clamping mechanism - Google Patents

Abstract

PURPOSE:To prevent abnormal load from being placed on shafts and to clamp molds well by controlling the oil quantity of plurality of hydraulic cylinders between the lower end of a movable board and the sliding plate of a machine base every time difference occurs in the parallelism between the shafts and the slide surface of the machine base. CONSTITUTION:The oil quantity of a plurality of hydraulic cylinders 15 installed between the lower end of the movable board 13 and the slide plate 16 of the machine base is controlled by the servo valve 18 on the lower side of the movable board and the tracer 20 in parallel with the shafts 14, 14 in incessant contact with the stylus 19 of the servo valve 18, every time a difference occurs the parallelism between the shafts 14, 14 and the slide surface of the machine and said difference is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding device for a movable platen in a horizontal mold clamping mechanism used for molding synthetic resin.

The conventional movable platen has its lower end placed on a sliding table installed on the machine stand.
The sliding base and the lower end were connected with bolts. Also, to adjust the position between the movable platen supported by a shaft such as a tie bar and the machine base, the lower end surface of the movable platen and the upper surface of the sliding table should be formed on the same slope, until both sloped surfaces touch each other. This was done by tightening the bolts.

Such adjustment means does not cause any particular problem in sliding of the movable platen when the sliding surface on the machine base and the shaft are set parallel to each other.

However, the machine base bends due to its own weight and the weight of the mold clamping mechanism on the machine base, and it also changes depending on the installation condition and the machining accuracy of the sliding surface on the machine base. It is extremely difficult to set and maintain parallelism, and if there is even a slight deviation in parallelism,
If a movable platen is provided with the above adjustment means, the following problems will occur.

1. The weight of the movable platen is applied to the shaft, and the sliding table pushes up the shaft via the movable platen, causing the shaft to flex and the parallelism of the movable platen to the fixed platen to be distorted. This will cause mold clamping failure.

2. The frictional resistance between the movable platen and the shaft, and between the sliding base and the machine base sliding surface increases, and the metal provided on these sliding parts progresses to wear, resulting in a loss of mechanical precision.

3. The driving energy of the mold clamping mechanism increases, resulting in significant energy loss.

Possible solutions to this problem include increasing the rigidity of the machine base to prevent it from bending, and finishing the sliding surfaces with high precision, but both have the drawback of high costs.

This invention was conceived from the above-mentioned circumstances, and its purpose is to allow the bending of the machine base, eliminate the need for particularly high-precision machining of the sliding surface, and form a mold that can be attached to a fixed platen and a movable platen. To provide a new sliding device for a movable plate which is not affected by changes in weight, tolerates wear of the sliding plate, and does not apply undue load to the shaft.

A feature of the present invention for the above-mentioned purpose is that it includes a fixed plate on the machine base, and a movable plate that moves on the machine base with respect to the fixed plate using a plurality of shafts fixed horizontally to the fixed plate as guides. In the horizontal mold clamping mechanism, a plurality of hydraulic cylinders are arranged vertically movably between the lower end of the movable platen and the sliding plate on the machine base, and a servo valve controls the amount of oil in each hydraulic cylinder. is provided on the lower surface of the movable platen, and the stylus of the valve is brought into contact with the tracer on the side of the movable platen, which is fixed to the fixed plate parallel to the shaft.
This makes it possible to adjust the difference in parallelism between the sliding surface on the machine base and the movable platen by controlling the amount of oil in the hydraulic cylinder.

The present invention will be explained in detail below using illustrated examples.

In the figure, 11 is a fixed plate extended over one end of the machine base 12, and 13
is a movable plate placed on the machine stand facing the fixed plate 11.

Shafts 14, 1.4 such as tie bars or clamp shafts are attached to the four corners of the fixed plate 11, respectively.
It is installed parallel to 2, and this shank) 14 , 14
A movable platen 13 is movably inserted through the plate.

Reference numeral 15 denotes a hydraulic cylinder, which is disposed between the lower end portions on both sides of the movable platen 13 and a sliding plate 6 provided on the machine stand 12 so as to be vertically movable. The output of this hydraulic cylinder is
3, which is greater than the predicted weight of the mold, and the stroke is greater than the amount of deflection of the machine base.

The hydraulic cylinder 15 in this embodiment is composed of an oil chamber 15a formed on the lower side of the portion of the movable platen 13 through which the shaft 14 is inserted, and a hydraulic piston 15b inserted downward into the oil chamber 15a. Hydraulic piston 15b
The sliding plate 16, which moves on the surface of the sliding plate 17 on the machine base, is attached to the protruding end of the machine.

Reference numeral 18 denotes a servo valve for controlling the amount of oil in the oil chamber 15a, and is provided on the lower surface of the movable platen 13 with the stylus 19 facing downward, and the stylus 19 is fixed to the fixed platen 11 in parallel with the shafts 14 and 14. Tracer 2 on the side of the movable plate
It is in contact with 0.

The servo valve 18 may be a commonly used electric or hydraulic type, and controls the amount of oil in the hydraulic cylinder 15 by the vertical movement of the stylus 19, and controls the amount of oil between the sliding surface on the machine base and the bottom of the movable platen. Depending on the difference in parallelism between the end face and the
It has a function of changing the amount of protrusion of the hydraulic piston 1.51) so that the difference does not affect the shafts 14, 14.

For example, if there is a difference in parallelism, the load of the movable platen 13 acts on the shafts 14° 14, and the movable platen 13 moves down due to the deflection of the shafts 14, 14, the dimension between the servo valve 18 and the tracer force also changes. change briefly. However, since the stylus [9] of the servo valve 18 is in constant contact with the tracer, it is pushed into the servo valve 18 and operates the servo valve 18 to apply the amount of oil to the hydraulic cylinder according to the amount of change. 15, and the above difference is adjusted by pushing out the hydraulic piston 151). Note that 21 indicates a mold.

Such operation of the servo valve 18 by the stylus 19 is performed when the servo valve 18 moves up and down together with the movable plate 13 and the dimension between the servo valve 18 and the tracer 20 changes. Even if 13 is pushed up, it operates reliably and maintains parallelism.
4. Prevent deflection due to unreasonable loads at 14.

According to this invention, as described in L, a plurality of hydraulic cylinders 15 are arranged between the lower end of the movable platen 13 and the sliding plate 16 on the machine stand.
The amount of oil is kept in constant contact with the servo valve 18 on the lower surface of the movable platen and the stylus 19 of the servo valve 18).
, 14 and the tracer 20 parallel to the shirt)
14, 14 and the machine platform sliding surface is controlled every time there is a difference in parallelism, and the difference is adjusted so that no load is applied to the shaft 14. This prevents bending of the machine platform.
Due to poor machining accuracy of the sliding surface, wear of the sliding plate, etc.
Even if the parallelism is impaired, the shaft does not bend, the movable platen is always parallel to the fixed platen, and the mold can be clamped under good conditions.

In addition, the structure is simple as it only requires installing a hydraulic cylinder and servo valve on the movable platen and installing a tracer on the fixed platen side, and there is no need to process the sliding surfaces with high precision.
This often results in high costs. Furthermore, since the movable plate is always positioned perpendicular to the shaft, there is little sliding bending, which not only reduces wear on the sliding parts, but also saves the driving energy required to move the movable plate. have

[Brief explanation of drawings]

The drawings show one embodiment of the movable platen sliding device in the horizontal mold clamping mechanism according to the present invention, and FIG. 1 is a side view of the main parts of the mold clamping mechanism, and FIG. It is a vertical front view of a half part in. 11... Fixed plate 12... Machine base 13.
...Movable plate 14...Shaft 15...
...Hydraulic cylinder 15a...Oil chamber 15b
......Hydraulic piston 16...Sliding plate 1
8...Sir is a valve ]9...Stylus addition...Tracer patent applicant Nissei Jushi Kogyo Co., Ltd. Figure 1 ■ 2 -1

Claims (1)

[Claims] In a horizontal mold clamping mechanism comprising a fixed plate on a machine base and a movable plate that moves on the machine base with respect to the fixed plate using a plurality of shafts fixed horizontally to the fixed plate as guides, the movable A plurality of hydraulic cylinders are arranged vertically between the lower end of the panel and the sliding plate on the machine base, and a valve for controlling the amount of oil in each hydraulic cylinder is installed on the lower side of the movable panel. A movable platen sliding device in a horizontal mold clamping mechanism, characterized in that the stylus of the serve valve is in contact with a tracer of force on the movable platen which is fixed to the fixed plate in parallel with the shaft.