JPH0347165B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an injection molding machine.

[Technical background of the invention and its problems]

Injection molding machines that melt thermoplastic resin and inject it into a mold require a planar frame and sliding surface to receive reaction force when the mold is clamped and to provide a sliding surface. It was hot. Moreover, since this sliding surface is a flat surface, the directionality when installing the machine is determined.

On the other hand, a servo motor is used as a driving means for the movable part, and the motor and the movable part are connected by a ball screw, a link mechanism, or the like. This results in a delay in movement between the motor and the movable object, complication of the mechanism, and reduction in efficiency.

[Purpose of the invention]

In order to eliminate the drawbacks of the above-mentioned prior art, the present invention has the following features:
The purpose of this invention is to provide an injection molding machine in which a mechanical part related to injection molding is housed within a cylindrical outer cylinder, and there is no directionality during installation.

[Summary of the invention]

In order to achieve the above object, the present invention includes an outer cylinder having mirror plates at both ends, a movable die plate guided by the inner surface of the outer cylinder inside the outer cylinder, and a movable die plate fixed to the inner surface of the outer cylinder. a fixed die plate, a shaft supported by one of the mirror plates and having one end fixed to the movable die plate, a linear motor attached to the mirror plate to move the shaft forward and backward, and a linear motor for melting and injecting a resin material. a barrel, a screw inserted into the barrel, an injection block that supports the barrel and is guided by the inner surface of the outer cylinder, a rotary motor that is locked to the other one of the end plates and rotates the screw; It is characterized by being equipped with a linear motor that advances and retreats.

[Embodiments of the invention]

The present invention will be described below with reference to embodiments shown in the drawings.

The outer tube 1 has a cylindrical shape, and the ends of the outer tube 1 are closed with end plates 2 and 3.

Inside the outer cylinder 1 on the side of the end plate 2, a movable die plate 4 is partially fitted into a guide groove 5 formed over a predetermined stroke range in the inner axial direction of the outer cylinder 1, so that it can be slid freely. One mold 6 is attached to the movable die plate 4.

A mold clamping motor 7 is provided on the inner surface of the end plate 2. This motor 7 is connected to the movable die plate 4
This is a linear motor consisting of a straight rotor 8 connected to the rotor 8 and a stator 9 provided on the inner surface of the end plate 2. The straight rotor 8 is led out from a hole in the end plate 2.

On the other hand, a fixed die plate 10 is fixedly provided in the outer cylinder 1 opposite to the movable die plate 4, and the other mold 11 is attached to the surface of the fixed die plate 10 that faces the movable die plate 4. ing.

Behind this fixed die plate 10, a barrel 13 into which a screw 12 is inserted is supported by a bracket 14 which is movable in the axial direction along the inner surface of the outer cylinder 1.

The injection block is composed of a barrel 13 and a bracket 14. A hopper 15 is provided on the upper part of the bracket 14, and the hopper 15 and the barrel 13 are connected through a passage 16 formed in the bracket 14.
The resin raw material supplied into the hopper 15 is supplied into the barrel 13. 17 is a heater disposed around the barrel 13, and 18 is an injection port that opens behind the fixed die plate 10 and into which the nozzle portion 13a at the tip of the barrel 13 enters.

A bracket moving motor 19 for moving the bracket 14 is provided between the bracket 14 and the fixed die plate 10. This motor 19 is a linear motor consisting of a straight rotor 20 fixed to a fixed die plate 10 and a stator 21 fixed to a bracket 14.

At the rear end of the screw 12, a screw rotation motor 22 and an injection motor 23 for moving the screw 12 forward and backward during injection are provided.

The screw rotation motor 22 is configured to rotate the screw 1.
The rotor rod 24 is connected to the rear end of the rotor rod 24, and the stator 25 is fixed to the inner surface of the end plate 3. and a stator 2 fixed to the mirror plate 3 around it.
7 is provided.

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

The resin raw material stored in the hopper 15 is sent toward the tip of the screw 12 (leftward in the figure) through the screw 12, which rotates by the drive of the screw rotation motor 22, and is sent to the heater 17 disposed on the outer surface of the barrel 13. ,17...and barrel 13 and screw 12
The resin raw material is shear heated between the two and melted.

The molten resin is stored at the tip of the screw 12. When the predetermined measurement is completed, the mold clamping motor 7 is driven and the molds 6 and 11 are brought together.

Next, the moving motor 19 is driven to align the nozzle 13a at the tip of the barrel 13 with the injection port 18 of the mold 11, and the injection motor 23 is driven to advance the screw 12 to perform an injection operation.

After injection is completed, wait for the resin in the mold to cool down, and then press mold 6.
is moved back, the space between the molds 6 and 11 is opened, and the molded product is taken out.

〔Effect of the invention〕

As explained above, in the present invention, the movement of the movable die plate holding one of the molds, the movement of the barrel of the injection molding part, and the rotation and movement of the screw are all performed within the cylindrical outer cylinder. There are no restrictions on direction when installing the device,
In addition, the force of each part is received by the loops of the outer cylinder, resulting in a strong structure, and since there is no need for a sliding frame as in the conventional case, smooth movement can be achieved.

In addition, by using linear motors as the motors for moving the moving die plate, barrel, and screw as in the illustrated embodiment, each member can be moved directly, without the influence of time lag or rattling during movement, and efficiently. It can be moved and the configuration can be simplified.

[Brief explanation of drawings]

The figure is a longitudinal side view showing one embodiment of the present invention. 1... Outer cylinder, 2, 3... End plate, 4... Moving die plate, 5... Guide groove, 6, 11... Mold,
7...Mold clamping motor, 8...Rotor, 9...Stator, 10...Fixed die plate, 12...Screw, 13...Barrel, 14...Bracket, 15
...Hotupa, 16...Aisle, 17...Heater, 1
8... Inlet, 19... Bracket moving motor, 20... Rotor, 21... Stator, 22...
...Screw rotation motor, 23...Injection motor,
24... Rotarod, 25... Stator, 26
...Rotor, 27...Stator.

Claims (1)

[Scope of Claims] 1. An outer cylinder having end plates at both ends, a movable die plate guided by the inner surface of the outer cylinder, and a fixed member fixed to the inner surface of the outer cylinder. a die plate, a shaft supported by one of the end plates and having one end fixed to the movable die plate, a linear motor attached to the end plate for moving the shaft forward and backward, a barrel for melting and injecting the resin material; A screw inserted into the barrel, an injection block that supports the barrel and is guided by the inner surface of the outer cylinder and is comprised of a barrel and a bracket, and is locked to the other one of the end plates and rotates the screw. An injection molding machine characterized by being equipped with a rotary motor that moves the machine and a linear motor that moves the machine forward and backward. 2. The injection molding machine according to claim 1, wherein the screw is separably engaged with a rotor rod in which a rotor of a linear motor for advancing and retracting the screw is arranged.