JPH1058479A - Composite injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily realize a two-color molding composite injection molding machine having high operating reliability by adding an injection unit having an electric servo motor as a drive source to a general-purpose hydraulic drive type injection molding machine having a drive source of the injection unit and a mold switching unit as a hydraulic drive source. SOLUTION: This composite injection molding machine adds a motor driven sub-injection unit 4 to a general-purpose hydraulic drive type injection molding machine as a base. The unit 4 is obtained by integrating all drive systems of the unit 4 itself. Accordingly, since a hydraulic circuit system is not necessarily dispersively disposed on a support base board 1, an altering position of the general-purpose hydraulic drive type injection molding machine as a base is limited to a minimum limit to provide excellent economy. The unit 4 having the electric servo motor as a drive source has excellent response to the operation, and hence can be accurately cooperated with the injecting operation of a main injection unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite injection molding machine having two sets of injection units for performing so-called two-color molding.

[0002]

2. Description of the Related Art A composite injection molding machine for two-color molding is provided with two sets of injection units for one mold opening / closing unit (clamping unit).
For example, a two-color molded product is obtained by sequentially injecting and filling various kinds of resin into a cavity (molded product forming space) of a mold.

Various types of composite injection molding machines for such two-color molding have been developed, such as a molded product in which only a predetermined part of the molded product is colored (replaced with a different kind of resin) or a so-called marble pattern. It is used for molding such as molded articles having the above-mentioned and sandwich molded articles in which the inside and the outside of the molded article are different resins.

In such a composite injection molding machine for two-color molding, a main injection unit having a large injection capacity and a sub-injection unit having a small injection capacity are often used in combination, and a combination of these two injection units is used. Conventionally, in a hydraulically driven injection molding machine in which the drive source of the main injection unit and the mold opening / closing unit is a hydraulic drive source, the drive source of the sub-injection unit is also a hydraulic drive source. In an electric injection molding machine in which the drive source of the main injection unit and the mold opening / closing unit is an electric servomotor, the drive source of the sub injection unit is also an electric servomotor.

[0005] In addition to the above, in the above-mentioned hydraulically driven injection molding machine or electric injection molding machine, air (pneumatic) is supplied to the drive source of the sub-injection unit.
Configuration using a drive source.

[0006] There are also known ones.

[0007]

In general, the above-mentioned structure or the above-mentioned structure is generally adopted. Conventionally, a machine (injection molding machine) dedicated to two-color molding is manufactured from the beginning of its development and design. This is because unifying all drive sources with hydraulic drive sources or electric servomotors has been the foundation of the design concept.

However, a composite injection molding machine for two-color molding is based on a general-purpose hydraulically driven injection molding machine (a hydraulically driven injection molding machine having one injection unit for one mold opening / closing unit). In order to meet the demand for manufacturing, the addition of a sub-injection unit that uses a hydraulic drive source necessitates a significant addition or change of the hydraulic circuit system, so it is based on a general-purpose hydraulic drive type injection molding machine. Is no longer meaningful, leading to higher costs.

In this respect, in the above configuration, since a sub injection unit using an air drive source is newly added to a general-purpose hydraulic drive type injection molding machine, it is assumed that an air piping system is laid in a factory. If so, there is no significant addition or change of the hydraulic circuit system, so that the realization is relatively easy. However, the sub-injection unit using the air drive source has poor injection responsiveness, and therefore, there is a problem that the sub-injection unit lacks the operation reliability that needs to be accurately linked with the injection operation of the main injection unit. .

[0010] The present invention has been made in view of the above points,
It is an object of the present invention to easily and easily realize a composite injection molding machine for two-color molding with high operation reliability based on a general-purpose hydraulically driven injection molding machine.

[0011]

According to the present invention, an electric servomotor is driven by a general-purpose hydraulic drive type injection molding machine in which a drive source of an injection unit and a mold opening / closing unit is a hydraulic drive source. The configuration is such that an injection unit as a source is additionally provided. Further, the control of each part of the machine including the injection unit driven by the electric servomotor is controlled by the control unit of the hydraulically driven injection molding machine.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a two-color molding composite injection molding machine according to one embodiment of the present invention. The machine (composite injection molding machine) of the present embodiment is based on a general-purpose hydraulically driven injection molding machine, and is provided with a sub-injection unit driven by an electric servomotor.

In FIG. 1, 1 is a support base board of a machine, 2 is a main injection unit mounted on the right side of the support base board 1 in the figure, and 3 is a mold opening / closing unit mounted on the left side of the support base board 1 in the figure. (Mold clamping unit) 4 is a sub-injection unit mounted vertically to the mold opening / closing unit 3 (mounted so as to be orthogonal to the main injection unit 2).

A main part of a hydraulic circuit system is housed in the support base board 1 together with a machine control system (an electric control system including a control unit mainly composed of a microcomputer). Pressure oil is supplied to the injection unit 2 and the mold opening / closing unit 3.

The main injection unit 2 is equipped with a hydraulic motor as a screw rotation drive source and an injection cylinder (hydraulic cylinder) as a screw forward / reverse drive source. The rotation of the hydraulic motor causes the screw to rotate. Driven, metering (kneading, plasticization, metering) is performed,
Further, the screw is driven forward by the advance of the piston rod of the injection cylinder, and the injection and filling of the molten resin into the mold by the main injection unit 2 is performed.

The mold opening / closing unit 3 is equipped with a mold closing cylinder (hydraulic cylinder) as a mold opening / closing drive source and an eject cylinder (hydraulic cylinder) as an eject driving source. The movable die plate is driven forward and backward by forward movement, mold clamping or mold opening is performed, and the eject member is driven forward by forward movement of the piston rod of the eject cylinder, and the molded product is ejected from the mold. .

The sub-injection unit 4 is equipped with an electric servomotor for measurement as a rotational drive source of the screw and an electric servomotor for injection as a drive source for forward and backward movement of the screw. The screw is driven to rotate to perform metering (kneading, plasticization, and metering), and the rotation of the electric servomotor for injection causes the screw to be driven forward via a rotation → linear motion mechanism, and the sub-injection unit 4 Injection / filling of the molten resin into the mold is performed.

As described above, the composite injection molding machine according to the present embodiment is based on a general-purpose hydraulically driven injection molding machine, with an electric sub injection unit 4 added thereto. I have. By the way, the electric sub injection unit 4
Since the unit 4 integrates all of its own drive systems, the hydraulic circuit system is connected to the support base board 1 as in the case where the sub-injection unit is constituted by a hydraulic drive type. Since there is no need to disperse the components, the number of changed parts of the base general-purpose hydraulically driven injection molding machine can be reduced to a minimum, which is economical. Also,
The sub-injection unit 4 using an electric servomotor as a drive source has excellent responsiveness in operation, and thus can be accurately linked with the injection operation of the main injection unit 2.

In FIG. 1, each unit 2,
Although details of 3 and 4 are omitted, since each individual unit is known, those skilled in the art will know that each unit 2 and
The configurations of 3 and 4 are obvious.

FIG. 2 is a simplified block diagram of a control system in the composite injection molding machine of the present embodiment. In FIG. 1, reference numeral 10 denotes a control unit mainly composed of a microcomputer for controlling the operation and display of the entire machine (composite injection molding machine);
1 is a sensor group composed of a large number of sensors provided in each part of the machine, 12 is a driver group composed of a large number of driver circuits for driving and controlling a large number of driving sources provided in each part of the machine, 13 Is a key input device disposed at a predetermined position on the front side of the support base board 1, and 14 is a display device such as a color CRT display and a color LCD disposed adjacent to the key input device 13. In the control unit 10 mainly composed of a microcomputer, 21
Is a molding condition setting storage unit, 22 is a molding process control unit, 2
Reference numeral 3 denotes an actual measurement value storage unit, and reference numeral 24 denotes a display processing unit.

The control unit 10 controls all the components of the machine (composite injection molding machine) including the sub injection unit 4 attached thereto.
It is possible to set various operating condition values of the machine using the key input device 13 and monitor actual statistical data of each part of the machine interactively with the key input device 13.

That is, the molding condition setting storage unit 21 stores
Various operating condition values input by the key input device 13 and the like are stored in a rewritable form. As the operation condition value (operation condition setting data), for example, the measurement control condition by the main injection unit 2 and the sub-injection unit 4
Control condition, injection condition by main injection unit 2, injection condition by sub injection unit 4, injection switching condition between main injection unit 2 and sub injection unit 4, mold closing control condition, mold opening control condition, eject control condition, For example, the temperature of the band heater of each part may be used.

The molding process control section 22 distributes to each section of the machine based on the molding process control program created in advance and the operating condition values (operating condition setting data) stored in the molding condition setting storage section 21. The driver group 12 (hydraulic valve) is referred to while referring to measurement information from the provided sensor group 11 (position sensor, rotation speed detection sensor, torque sensor, temperature sensor, etc.) and time measurement information from a clock incorporated therein. A corresponding drive source is driven and controlled via a driver, an electric motor driver, a heater driver, etc., and a series of two-color forming processes is executed.

Further, the actual measured value storage unit 23 fetches all actual measured data of preset monitor items during continuous automatic operation over a predetermined number of consecutive shots. Using the stored actual measurement data, the control unit 10 performs, for example, statistical calculation processing of the actual measurement data, and performs conversion processing for obtaining display data in the display processing unit 24.

The display processing unit 24 is provided with the key input device 1
3 generates display screen data of a designated display mode based on a display screen creation control program created in advance, in response to an instruction to call a display screen of a mode desired by the operator, thereby displaying the mode desired by the operator. A screen is displayed on the display device 14.

As described above, in the present embodiment, the control unit 10 mainly composed of a microcomputer built in the support base board 1 comprises a hydraulically driven main injection unit 2, a mold opening / closing unit 3,
And the overall operation of the motor-driven sub-injection unit 4 and the operating conditions of the entire machine (composite injection molding machine) using the key input device 13 and the display device 14 provided on the support base board 1. It is possible to centrally operate the setting of values and the like in a lump, resulting in excellent usability.

[0027]

As described above, according to the present invention, a composite injection molding machine for two-color molding having high operation reliability based on a general-purpose hydraulically driven injection molding machine can be realized easily and easily. be able to.

[Brief description of the drawings]

FIG. 1 is a front view of a composite injection molding machine for two-color molding according to an embodiment of the present invention.

FIG. 2 is a simplified block diagram of a control system in the two-color molding composite injection molding machine according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support base board of machine 2 Main injection unit 3 Mold opening / closing unit (mold clamping unit) 4 Sub-injection unit 10 Control unit 11 Sensor group 12 Driver group 13 Key input device 14 Display device 21 Molding condition setting storage unit 22 Molding process control unit 23 measured value storage unit 24 display processing unit

Claims (2)

[Claims] 1. A composite injection apparatus comprising: a general-purpose hydraulic drive type injection molding machine in which a drive source of an injection unit and a mold opening / closing unit is a hydraulic drive source; and an injection unit in which an electric servomotor is a drive source. Molding machine. 2. The control unit of the hydraulically driven injection molding machine according to claim 1, wherein control of each unit of the machine including an injection unit driven by the electric servomotor is generally controlled. Composite injection molding machine.