JPS59215841A - Injection molding machine - Google Patents

Abstract

PURPOSE:To reduce the time of enabling the start of molding when the operation is started by adding a high frequency heating electrode in an injection cylinder to raise the temperature in the cylinder quickly. CONSTITUTION:A high frequency heating electrode 9 is attached between a cylinder 8 and a support 11 in a non-conductive transparent glass tube. A melting material is poured into the cylinder 8 from a material hopper. Then, a melting material in the cylinder 8 is melted with the high frequency heating electrode 9 and injected into a mold with a plunger 14. Thus, the melting material is melted and molded thereby shortening the melting time of the material along with a limited disconnection of a heater.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a resin injection molding machine.

Conventional configuration and problems The conventional injection molding machine has a concrete example as shown in Fig. 1.
E. When melting and injecting the plastic raw material in the bar 6, the rotation of the motor 4 causes the screw 1 to pass through the speed reducer 5.
Rotate.

The raw material supplied into the cylinder 2 from the hopper 6 is plasticized by the shear heat generated by the rotation of the screw 1 and by heating from the external heater 7, and is accumulated in the front part of the cylinder 2. Next, by operating the injection cylinder 3, the screw 1 advances to inject the plasticized raw material.

The problem with the conventional example described above is that the screw 1 is
Because it performs rotational motion and back-and-forth motion in the axial direction, its structure is complex, and it is necessary to have separate drive sources for both motions.

Also, since it takes a long time to raise the temperature of the heater 7, the molding start 20
It is necessary to energize the heater 7 at least 30 minutes before the start of the process, which may cause a big problem when connecting or synchronously operating a molding machine and an assembly line, for example.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to increase the temperature inside the cylinder in a short time and shorten the time required to start molding at the start of operation.

Structure of the Invention The present invention uses a non-conductive glass tube or the like as a cylinder, and the raw material inside the tube is melted by a high-frequency heating electrode placed outside the tube. It is injected into a mold.

By using high frequency waves to melt the raw materials, it takes just a few minutes to reach the predetermined melting temperature, which is extremely short compared to heater heating, making it easy to restart molding after interruption, especially when using an assembly conveyor. This is advantageous for synchronous operation.

DESCRIPTION OF EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 2, 8, and 3. In the figure, 8 is a cylinder made of a non-conductive transparent glass tube, and 9 is a high-frequency heating electrode disposed outside the cylinder 8.

A metal nozzle 10 is fitted to the front of the cylinder 8 and is connected to an auxiliary plate 12 via a support 11, thereby transmitting the pressure applied to the nozzle 1o to the auxiliary plate. cylinder 8
The molten raw material (not shown) inside is injected into a mold (not shown) by a plunger 14 of an injection cylinder 13.

A raw material hopper 16 is fixed to the auxiliary plate 12.

18 is a nozzle heater.

In such a structure, the molding raw material (resin, etc.) inside the cylinder 8
is melted and molded by high-frequency dielectric power from the high-frequency heating electrode 9, so compared to conventional screw and band heater methods, the raw material melting time is shorter, and heater breakage accidents are extremely rare, eliminating interruptions in molding. , it also has the feature of being easy to restart.

As described in detail, the injection molding machine of the present invention has a cylinder that is non-conductive, and the resin is melted by dielectricity from a high-frequency heating electrode on the outside of the cylinder. Injecting resin into a closed mold
Compared to conventional screw and band heaters, the material melting time is shorter, heater breakage accidents are extremely rare, and molding can be easily interrupted and restarted. be.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional in-line screw type injection device, and FIG. 2 is a longitudinal sectional view of an injection molding machine according to an embodiment of the present invention.

Claims (1)

[Claims] A high-frequency heating electrode is arranged on the outside of a non-conductive cylindrical cylinder, a nozzle is provided at one end of the cylinder, and a plunger of an injection cylinder is connected to the inner wall of the cylinder at the other end. Provided in sliding contact with. An injection molding machine in which resin in the cylinder can be melted by the high-frequency heating electrode.