JPS5816814A - Compression molding apparatus - Google Patents

Abstract

PURPOSE:To obtain a molded product having a constant wall thickness, by inputting a position information from a potentiometer detecting the position of a pressurizing telescopic die to a control apparatus and controlling the wall thickness of resin in a molding cavity due to control of a cylinder and a heater. CONSTITUTION:A pressurizing telescopic die 3 constituting a part of a molding cavity 6 in a mobile mold 2 and a potentiometer 8' detecting the position of the telescopic die 3 are provided. Further, a control apparatus 11 which controls a pressurizing cylinder 7 giving a pressurizing force to the telescopic die 3, obtaining an information from the potentiometer 8', and a heater 4 heating the inside of the molding cavity 6 is provided. Then, a position information from the potentiometer 8' is inputted to the control apparatus 11 and treated on the way of compression molding, a control signal is outputted from the control apparatus 11 and behavior of the pressurizing cylinder 7 and the heater 4 is controlled. By this, the wall thickness of resin inside the cavity 6 being controlled to a predetermined size, molding is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compression molding apparatus for producing precision molded products such as plastic lenses.

With conventional compression molding molds, it is possible to measure the cavity wall thickness before and after pressurization during the molding process, but it is difficult to manage this.
It was difficult to control. Therefore, if the specified cavity thickness cannot be obtained, it may be necessary to change the amount of resin light*, adjust the heat melting time or pressurizing force individually, or insert a spacer into the pressurizing mechanism. It was necessary to prepare a section and change the thickness of this space. Furthermore, this adjustment cannot be made within the same shot; changes can only be made in the next shot after measuring the wall thickness of the molded product, so if there are variations in the molded product, countermeasures and results can be taken. The cause-and-effect relationship could not be determined, and the only thing that could be done was to control the thickness of the cavity with low precision. However, since only low-accuracy cavity wall thickness control is possible, variations in the amount of injected resin between molding machines before pressurization directly affect the cavity wall thickness after pressurization, making it possible to obtain molded products with stable wall thickness. The yield rate was low.

The object of the present invention is to overcome the drawbacks of the prior art mentioned above.

The odor of the mold used to compress the comb and cavity.

Then, molded products with a specified wall thickness are continuously obtained and the yield is reached.

An object of the present invention is to provide a compression molding device that improves the performance of the compression molding process. .

In order to achieve the above object, a potentiometer that operates in conjunction with the pressurized sliding piece is provided in the mold, and position information of the potentiometer is input to the control device. The control device can control the pressurizing cylinder and heater via the cylinder drive source and the heater controller, and pressurizes the cavity section based on internal software and information given to the controller from the outside. I started heating it. Through this series of mechanisms, the cavity wall thickness is stabilized by pressurizing and heating the resin within the cavity in accordance with the variations before pressurization.

The present invention will be specifically described below based on embodiments shown in the drawings. In this example, the pressure slide constitutes a part of the molding cavity 6 within the movable mold 2°.

The moving entry piece 6, the gap holding rod 8 and the potentiometer 8', which slide in conjunction with each other via the push-out plate 5, are installed so as not to be affected by pressurization. A control device 11 for inputting information on the potentiometer 8' and processing internal software is installed in the mold, and a cylinder drive source 10 and a heater controller 9 are installed on the output side of this control device t11. There is. The heater controller 9 is wired to the heater 4 for heating the pressurized sliding insert piece 3. Further, the cylinder drive source 10 includes a pressurizing sliding piece 6f and a pressurizing cylinder for pressurizing.

connected to the terminal 7. 11゛Next, the operation of this example starts with the software in the controller device.

The toe air is pressurized via the cylinder drive source 10.

When the cylinder 7 applies pressure to the pressurized sliding entry piece 3 from the rear of the extrusion plate 5, the gap holding rod 8 and the potentiometer 81 attached thereto are interlocked 15 to send out a position information signal. This position information signal is input to the attached control device 11, processed by internal software of the control device 11, and output as a control signal to the cylinder drive source 10'♂ and heater controller 6-9. The pressurizing cylinder 7 connected to the cylinder drive source 10 and the heater 4 connected to the heater controller 9 each act on the pressurizing sliding piece 6,
The resin in the molding cavity 6 is heated under pressure to change the cavity wall thickness. This change is again caused by the potentiometer 81
'f: The signal is input to the controller 11 via the controller 11 and processed to control the cylinder drive source 10 and the heater controller 9, thereby operating the pressurizing cylinder 7 and the heater 4.

By repeating these series of operations, the thickness of the resin inside the molding cavity 6 is controlled and shaped to a predetermined dimension within the same shot. .

As explained above, according to the present invention, the wall thickness varies.

It has become possible to obtain stable molded products with a heel of 0.01 [:mm] or less, and the yield has improved. are individually adjusted.

A spacer is added to the pressure mechanism to adjust the wall thickness.

There is no longer a need to input the molding results, and the molding results can be judged and corrective actions taken in the next shot.

4. Since these measures can be taken within the same shot and the time required for adjusting these measures can be eliminated, molding efficiency can be significantly improved.

[Brief explanation of the drawing]

The figure is a sectional view showing an example of a specific embodiment of the present invention. 1...Fixed mold 2...Movable mold 3...Pressure sliding piece 4...Heater 7...Pressure cylinder
8'...Body strength 3 meter 9...Heater controller 10...Cylinder drive source 1011...Controller 5 Representative Patent Attorney Usui 1) Tori ,,: Sachi 1.11.

Claims (1)

[Claims] In a compression molding device that applies pressure to a part of a molding cavity to precisely shape a plastic lens, etc., there is provided a compression molding device that applies pressure to a part of a molding cavity, and includes a sliding piece or a pressure block that presses the cavity, and a pressurizing block that slides to pressurize the cavity. A potentiometer that detects the position in conjunction with the pressure block. - a pressurizing cylinder for applying a force d pressure to the inserting piece or pressurizing block; and a molding cap. and a control device for obtaining information from the potentiometer and controlling the pressurizing cylinder and the heater according to the position information signal from the potentiometer. A compression molding apparatus characterized in that the resin in the cavity is pressurized and heated by a pressure cylinder and a heater to obtain a required gear thickness.