JPS6225022A - Injection molding machine - Google Patents

Abstract

PURPOSE:To prevent the delay of movement and enhance the quick response by means of driving the movable portion directly with the linear motors disposed linearlly between the movable bracket and the fixed die plate, and the rear end of screw and the movable bracket respectively. CONSTITUTION:The movable die plate 6 supporting the mold 5B is set between the bracket 21 fixed to the frame 20 and the fixed die plate 4 supporting the mold 5A. The barrel 2 is supported with the movable bracket 22 moving on the frame 20, and the screw is installed in the barrel 2, being rotated freely with the screw rotating motor 23. The mold clamping motor 24 consisting of linear motors respectively for rotating and travelling is mounted between the movable die plate 6 and the fixed bracket 21. The motor for moving bracket consisting of linear motors respectively for rotating and travelling is mounted between the movable bracket 2 and the fixed die plate 4. The injection motor 26 consisting of linear motors respectively for rotating and travelling is mounted between the rear end of screw and the movable bracket 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an injection molding machine that melts thermoplastic m1lllf and injects it into a mold to form a molded product of a predetermined shape.

[Technical background of the invention and its problems]

As shown in the cross section in Fig. 2, while the thermoplastic resin is conveyed by the screw 1, it is heated by the heater 3 disposed on the outer periphery of the barrel 2 into which the screw 1 is inserted, and subjected to shearing action by the screw 1. An injection molding machine that melts thermoplastic resin by the heat generated by itself and injects it into a mold combines a mold 5A mounted on fixed die plates 1 to 4 with a mold 5B mounted on a movable die plate 6, and then molds the resin. Drive means for movable parts, such as the drive for tightening, the rotation of the screwco 1, and the forward and backward drive, are all driven by a gear 11 from a servo motor 7 via an injection clutch 8, a screw rotation clutch 9, and a mold clamping clutch 10. ~16, and screws 17 and 18 were used to rotate and move forward and backward.

Therefore, in conventional injection molding machines, many transmission mechanisms such as clutches, gears, and screws are involved before the rotation of the servo motor 7 is transmitted to the movable parts, which tends to cause operational delays and slow down the machine. becomes complicated and the efficiency decreases.
There was a drawback.

[Purpose of the invention]

The present invention has focused on the above-mentioned drawbacks of the prior art, and has been made with the aim of improving the above-mentioned problems.A linear motor is used to drive the movable parts, and the complicated structure of the movable parts with slow movement is avoided. The purpose of the present invention is to provide an extrusion molding machine that can solve the above problems and improve efficiency.

(Summary of the Invention) In order to achieve the above object, the injection molding machine according to the present invention has a fixed bracket fixedly installed on a frame and a fixed die plate 1 supporting a mold on one side, and a mold on the other side. A movable die plate that supports the mold is provided, and a scri 1 is rotatably inserted into a barrel supported by a movable bracket movably provided on the frame, and heats and melts the resin material supplied into the barrel. In an injection molding machine that performs molding by injecting into a mold from a tip nozzle, the movable die plate, the fixed bracket 1~, the movable bracket l~
The present invention is characterized in that a linear motor consisting of a rotor rod and a stator, in which rotating and linear magnetic poles are arranged linearly, is provided between the fixed die plate, the rear end of the screw, and the movable bracket.

[Embodiments of the invention]

Hereinafter, the present invention will be explained based on the embodiment shown in FIG. 1, with the same reference numerals assigned to the same members as in FIG. 2.

A movable die plate 6 that supports the other die 5B is provided between the fixed brackets 1 to 21 fixed on the frame 20 and the fixed die plate 4 that supports the die 5Δ on one side. A barrel 2 is supported on a movable bracket 1 to 22 which is movably provided on the frame 20, and a screw 1 is inserted into the barrel 2 and can be rotated by a screw rotation motor 23.

The movable die plate 6 and the fixed bracket t-21, the movable bracket 1-22 and the fixed die plate 4, and the screw (1
Between the two ends and the movable bracket 22, a mold clamping motor 24 consisting of a linear motor for rotation and a linear motor, respectively, is connected to the bracket 1.
- A moving motor 25 and an injection motor 26 are provided.

The mold clamping motor 24 consists of a linear rotor 24A connected to the movable die plate 6 and a stator 24B provided on the inner surface of the fixed brackets 1 to 21.
The rubber 24A is led out from a hole in the fixing bracket 21.

The bracket moving motor 25 includes a straight rotor 25A fixed to the fixed die plate 4 and a moving bracket 22.
The stator 25B is fixed to the stator 25B.

Further, the injection motor 26 includes a rotor rod 26 connected to the rear end of the screw 1 and inserted into the holes of the movable brackets 1 to 22.
A and the stator 26B fixed to the movable bracket 22
It consists of

There is a hopper 27 on the top of the movable bracket 22,
The hopper 27 and the inside of the barrel 2 are communicated through a passage 28 formed in the movable bracket 22.
The resin raw material supplied into the barrel 7 is supplied into the barrel 2. 3 is a heater arranged around the barrel 2, and 4A is an injection port that opens in front of 4 into the fixed die plate 1 and into which the nozzle portion 2A at the tip of the barrel 2 enters.

Next, the operation of the above embodiment will be explained.

The resin In 11 stored in the hopper 27 is sent to the left in the figure (towards the tip of the screwco) by the screw 11 which is rotated by the drive of the screw rotation motor 23, and is sent to the heater 3°3 disposed around the barrel 2. ... and the shear heating of the resin raw material between the barrel 2 and the screw 1.

The molten resin is stored at the tip of the screw 1. When the predetermined measurement is completed, the mold clamping motor 24 is then driven to bring the molds 5A and 5B together. Next, the bracket 1 to the moving motor 25 are driven, the nozzle 2A at the tip of the barrel 2 is aligned with the injection port 4Δ to the mold 5, and the injection motor 26 is driven to advance the screw 1 to perform an injection operation.

After that, wait for the resin in the mold to cool down and carry out the measuring process.
Open the space between molds 5A and 5 [3 and take out the molded product.

〔Effect of the invention〕

As explained above, the present invention provides a fixed guide plate to the movable bracket 1, a linear motor consisting of a rotor rod and a stator each having magnetic poles arranged linearly between the rear end of the screw and the movable bracket, and is movable by this linear motor. Since the part is driven by the die reflex 1-, there is no delay in operation, the coordination is improved, efficiency is improved, and at the same time, the mechanism can be significantly simplified.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view of an injection molding machine using a conventional servo motor. 1...screw, 2...barrel, 3...heater,
4...Fixed Guiplay 1-15A, 5B...Mold,
6...Moving Guiplay 1-120...Frame, 2
1...Fixed bracket l~, 22...Movable bracket 1
-123... Tanabata for screen rotation, 2/1... Mold clamping motor, 25... Bracket movement motor, 26
...Ejaculation Tanabata.

Claims (1)

[Claims] A movable die plate that supports the other mold is provided between a fixed bracket fixed on the frame and a fixed die plate that supports the mold on one side, and a movable bracket that is movably provided on the frame. In an injection molding machine, a screw is rotatably inserted into a barrel supported by a barrel, and a resin material supplied into the barrel is heated and melted and injected into a mold from a tip nozzle to form the mold. Injection molding characterized by a fixed bracket, a movable bracket and a fixed die plate, and a linear motor consisting of a rotor rod and a stator in which rotating and linear magnetic poles are arranged linearly between the rear end of the screw and the movable bracket. Machine.