JPS59229307A - Injection device - Google Patents

Abstract

PURPOSE:To reduce deaeration time by achieving vacuum deaeration treatment, applying ultrasonic wave to raw material resin before it is poured into a mold. CONSTITUTION:Raw material resin 13 is supplied into the vessel 11 with an upper opening, and the flexible membrane 12 such as rubber is spread thereabove. The pipe 14 penetrating the membrane is connected to a vacuum pump 2 and the air in the vessel is exhaused. Ultrasonic wave is applied to the thermoplastic or thermosetting resin such as phenol, allyl or polyester by the oscilator 15 provided on the wall of the vessel 11, whereby small bubbles are collected at the loop of vibration and combined mutually into large bubbles. They are gradually raised and exhaused by vacuum. According to the deaeration, the flexible membrane 12 is pressurized by ambient pressure, whereby the air in the vessel may be exhaused by pressurizing. The perfect deaeration treatment may be achieved for very short period by such deaeration treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an injection device for injecting a resin raw material into a mold and solidifying it.

With the development of a method of mixing resin with a curing agent and curing it through an exothermic reaction, it has become possible to easily produce cast products at room temperature.

In the conventional casting method, the mold is coated with an appropriate mold release agent, a microwave oven is placed, and an appropriate amount of hardening agent is placed in a container, and the mixture is gently mixed with a stirrer to avoid air bubbles. When adding a filler, pour the mixture after the air bubbles disappear after mixing. In this case, air bubbles are removed by evacuation, but usually it takes about 30 minutes just for evacuation treatment.

The present invention has been improved to shorten the time required for this defoaming treatment and to perform the complete treatment, and is characterized in that an ultrasonic vibrator is provided to carry out the vacuum defoaming treatment while applying ultrasonic waves.

The present invention will be described below with reference to an embodiment of the drawings. In FIG. 1, 1 is a vacuum degassing chamber, 2 is a vacuum pump, 3 is a molding chamber, 4 is a mold, 5 is a funnel for pouring raw materials into the mold, 6 is a pump that supplies the resin raw material from the processing chamber 1 to the funnel 5; 1 and 8;
is a pressure cylinder for pressing the mold 4, and 9 is a microwave for heating.

Figure 2 is a detailed view of the interior of the degassing chamber 1, showing the container 1 with an upward opening.
A raw material resin 13 is supplied to 1, and a flexible film 1 made of rubber or the like is placed on top.
2 is stretched, and the pulp 14 passing through it is communicated with the vacuum pump 2 and evacuated. 15 is a vibrator that applies ultrasonic vibration from the container wall.

The raw material supplied into the container 11 of the degassing chamber 1 is a mixture of a suitable amount of resin and a curing agent, and in some cases a filler and a plasticizer, mixed with a stirrer. The resin used for this purpose is a thermoplastic or thermosetting resin such as phenol, allyl, polyester, styrene, acrylic, isocyanamide, epoxy, silicone, etc. The raw materials are mixed gently using a stirrer to avoid air bubbles, but air bubbles cannot be avoided. Therefore, this mixed raw material is supplied into the container 11 and subjected to vacuum degassing treatment.

A vibrator 15 is provided on the container wall, and from now on 103~
Ultrasonic waves of about 105 Hz and 1 to 20 w/c Ura 2 are applied. As a result, the small bubbles have a diameter of about 0.1m1llφ or less and gather at the nodes of the vibration, and bubbles with a diameter of about 0.3+n+nφ gather at the antinode of the vibration and coalesce together to form a large catch, which gradually rises. It will be evacuated.

As degassing occurs, the flexible membrane 12 is pressurized to the atmosphere, and the internal gas can be pressurized and evacuated, and this degassing process enables complete degassing in an extremely short time.

Conventionally, processing that required about 10 to 30 minutes using only vacuum evacuation can be completed in a short time of about 1 to 5 minutes by applying ultrasonic vibration according to the present invention.

The degassed material is supplied to the funnel 5 by the pump 6, and the mold 4 is expanded by the cylinder 7.8.
It is injected into the interior and solidified. The mold 4 is heated to about 100 to 120° C. by microwave 9 and allowed to cool after injection. In order to sufficiently expand the raw material resin into the mold 4, the cylinders 7.8 are driven to apply pressure.

The accuracy of the molded product molded in the manner described above can be improved to approximately ±0.02 mm, compared to the conventional product that does not undergo sufficient defoaming treatment, which is approximately ±0.035 mm. confirmed.

Although the pump for evacuating the inside of the molding chamber 3 is omitted in the embodiment, precision molding can be performed by vacuuming the molding chamber each time. A laser or others can be used as a heating device for the molding chamber.

As explained above, the present invention adds ultrasonic vibration to the vacuum degassing treatment of the raw resin, so the treatment time is reduced to 1/1.
It is possible to shorten the time to 0 or less, and to perform sufficient defoaming treatment. Then, by injecting this sufficiently defoamed resin into a mold and solidifying it, the density increases and molding accuracy improves.

Pressure pressing during molding significantly improves accuracy, compared to conventional 3
Precision molded products improved by 0 to 50% can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a partially detailed diagram thereof. 1... Vacuum degassing chamber 2... Vacuum pump 3... Molding chamber 4... Mold 5...Funnel 6...Pump 7.8...Pressure cylinder 9...
...Microwave 11...Container 12...Flexible membrane 13...Resin 14...・Exhaust pump 5- 15... Vibrator patent application person -〇-

Claims (1)

[Claims] A processing chamber is provided for vacuum degassing the raw material resin before it is injected into the mold, a vibration device is provided that applies ultrasonic vibration to the resin in the treatment chamber, and the vacuum degassing is performed while applying ultrasonic vibration. An injection device characterized by: