JPH06853A - Injection molding device - Google Patents

Abstract

PURPOSE:To properly replace a core by a core replacing means and suitably preheat a core to be used next in an injection molding device provided with a core replaceable mold. CONSTITUTION:A core preheating device 14 for previously heating a core to be used next is disposed in a specified position of a main body in an injection molding machine 2. The core preheating device 14 may be provided with a temperature control means, a core ejecting means, and a pressing means for pressing a core in an axial direction. In addition, a plurality of cores may be contained in the core preheating device 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus using a core exchange type mold.

[0002]

2. Description of the Related Art In an injection molding operation in which a lot of products in a small amount is various, a core-replaceable mold is used in an injection molding machine in terms of efficiency of mold replacement. The plurality of cores prepared for replacement are arranged around the injection molding machine and appropriately replaced.

In the past, core replacement has often been performed manually, but automation using a core replacement means such as a robot is required to make molding operation automatic for a long time.
Further, it is preferable to preliminarily control the temperature of the core in order to accelerate the rise of the injection molding operation after the core is replaced.

[0004]

SUMMARY OF THE INVENTION The present invention is an injection molding apparatus that uses a core-exchangeable mold and can accurately replace the core by the core-exchange means, and the core to be used next time. An object of the present invention is to provide an injection molding device capable of appropriately controlling the temperature.

[0005]

A core pre-temperature adjusting device is provided at a fixed position of an injection molding machine body. The core pre-temperature control device may include a control means for controlling the temperature of each core stored according to the molding plan. The core pre-temperature control device may be able to accommodate a plurality of cores. The core pre-temperature control device may be provided with core ejecting means at the bottom. The core preliminary temperature adjusting device may include a pressing unit that axially presses the stored core.

[0006]

The core pre-temperature control device arranged at the fixed position of the main body of the injection molding machine determines the position of the core to be mounted next time on the injection molding machine to the robot, and the core is predetermined. Raise to temperature.

[0007]

EXAMPLE An injection molding machine 1 (FIG. 1) comprises an injection molding machine 2,
It is composed of a robot 3, a storage device 4 for cores and hands, a temperature control device 5, and a product stocker 6. The injection molding machine 2 and the robot 3 are respectively provided with control devices 7 and 8 (hereinafter simply referred to as control devices 7 and 8), and the overall control is performed while communicating with each other.

The control device 7 stores a molding plan program for products to be continuously produced this time and a molding program common to each product. The molding plan program includes a molding sequence of a plurality of types of products obtained by this molding plan, a core to be used, the number of products, necessity of purging, a time when a robot hand is required, and a kind of hand. Also,
Molding data (mold thickness, temperature control temperature, measurement, pressure holding / cooling time, etc.) that differ for each product is preset by the operator and stored as a data block for each product. This block is called by the molding plan program corresponding to the product to be molded and is used in the execution of the molding program.

The controller 8 stores the storage positions of the cores and the hands, which are stored by teaching, and the core replacement procedure and the various hand replacement procedures. The robot 3 is one of the core exchanging means, and the core exchanging means may be integrated with the injection molding machine 2 such as being configured on a fixed platen of the injection molding machine 2.

The core and hand accommodating device 4 accommodates a core 9 (FIG. 3) to be used and a hand 10 (FIG. 4) to be exchanged and used by the robot 3, and is used as an operating origin of the robot 3. On the other hand, the core 9 and the hand 10 are always located at fixed positions. In each core, the storage position of the hand,
A limit switch L1 for confirming the storage is arranged. The product stocker 6 is configured to have a plurality of compartments so that molded products (products) can be sorted and stored. The core 9 has a round shape and is composed of a fixed core 9a and a movable core 9b. The prepared core 9 has the same outer dimensions and the same size. These cores 9 are attached to the mother die in the opening / closing direction of the die.

In the main body of the injection molding machine 2, the mold clamping unit 12 and the injection unit 13 are arranged on the base 11 so as to face each other, and the core preliminary temperature control is performed on the front surface of the base 11 at a position corresponding to the facing distance between the two units. A device 14 is provided. This position is within the operating area of the robot 3.

In FIG. 2, reference numeral 15 is a cylinder assembly, and reference numeral 16 is a gate door. Gate door 16
Is arranged in the clamp portion of the mold clamping unit 12 so as to be openable and closable. Further, in FIG. 1, reference numeral 17 is a manual input and display device. This device 17 can be moved to the position of the broken line when data is input, which is convenient for use.

The core pre-temperature control device 14 is a container-shaped member (FIG. 3) having a storage hole 18 opened upward, and is stored in the storage hole 18.
The periphery of is surrounded by a heat insulating material, and the temperature control liquid flow path 19 is formed inside the storage hole 18 so as to surround it. Temperature control liquid flow path 1
9 is connected via a hose 20 to a temperature controller 5 attached to the injection molding machine 2. The temperature of the temperature control liquid supplied by the temperature control device 5 is adjusted according to the core 9 stored in the storage hole 18. The central processing unit (CPU) of the control device 7 reads the data for that purpose from the data block of the core 9 currently in use according to the molding program, and commands the value to the temperature control device.

In the first embodiment shown in FIG. 3, the diameter of the storage hole 18 is slightly larger than the outer diameter of the core 9, and the depth is such that the entire core 9 fits when the core 9 is stored. It is said that Further, an air actuator 21 for ejection is attached to the bottom portion, and a piston 22 thereof is vertically penetrated through the bottom portion and fixed to an ejection plate 23 arranged inside the accommodation hole. A limit switch L2 for detecting that the core 9 is completely stored is arranged in the storage hole 18. The core 9 is always handled in a combination of a fixed side and a movable side.

FIG. 4 shows a second embodiment of the core pre-temperature control device 14, which is also provided with a container-shaped storage hole 18, the periphery of which is surrounded by a heat insulating material and an electric heater 24. Electric power to the heater 24 is supplied to the control device 7
It is adjusted by a temperature control device which operates in response to data and commands sent from Reference numeral 25 is provided by a thermocouple for feedback control of the preliminarily adjusted temperature. That is, the core preliminary temperature adjusting device 14 includes temperature control means. The temperature is adjusted in the same manner as described in JP-A-2-201397.

In this embodiment, the storage hole 18 is formed by the core 9
Is shallower than the axial dimension of the fixed side and the movable side of the core 9 (a,
The parting line P of b) is exposed to the upper side, and a cap 27 driven by an air actuator 26 is provided on the exposed fixed core 9a. The cap 27 presses the core 9 from above so as not to shift the position of the fixed core 9a with respect to the movable side, and constitutes a pressing means together with the actuator.

FIG. 5 shows a third embodiment of the core preliminary temperature adjusting device 14, which is provided with a plurality of core housing holes 18. As described above, each of the storage holes 18 is provided with the temperature control liquid flow path 19 or the electric heater 24, and the temperature thereof is controlled.

The injection molding apparatus 1 generally operates as follows. A mold equipped with a core 9 is attached to the injection molding machine 2 and is maintained at a predetermined temperature by the temperature control device 5, and the injection molding machine 2 is in a state where various conditions for starting the molding operation are set. The core 9 for preliminary use is stored in the core preliminary temperature controller 14, and the temperature suitable for the core 9 is adjusted in advance. The robot 3 is in a standby state with the hand as a product takeout hand.

When the injection molding apparatus 1 is in the molding mode,
The injection molding machine 2 performs a normal molding operation, and the robot 3 takes out the product from the clamp portion of the mold clamping unit 12 at the end of each molding cycle, sorts the product in the product stocker 6, and stores it. The product is taken out from above the clamp part. The controller 8 of the robot 3 includes the controller 7 of the injection molding machine 2.
From this, a command for taking out and carrying a product is issued at the end of each molding cycle. It should be noted that the control device 8 has previously transmitted from the control device 7 the data regarding the product storage position in the data regarding the core 9 used this time.

When the control device 7 judges from the count of the molding cycle that the required number of lots of products have been obtained by the core 9 this time, the injection molding device 1 is set to the core exchange mode. Then, the controller 7 issues a core replacement command. As a result, the injection molding machine 2 is stopped with the mold open, and the robot 3 returns the product takeout hand to a predetermined position of the storage device 4 and waits.

The control device 7 judges whether or not the resin exchange is assembled, and when it is assembled, the control device 7 commands the purging operation. In this case, the robot 3 selects a purge jig as a hand from the storage device 4 and arranges this at the tip of the nozzle of the injection unit 13. Then, the injection molding machine 2 is caused to perform a purge operation.

When it is not necessary to replace the resin, the core replacement operation is instructed, and the robot 3 uses the core replacement hand 10 (FIG. 4) and takes out the core 9 of this time from the mold and stores it. Return to 4. Since the specific operation of taking out the core 9 is not the gist of the present invention, the description of the operation of taking out the core in Japanese Patent Application No. 4-56345 is incorporated and the description thereof is omitted.

When replacing the core, the robot 3 may open and close the gate door 16 of the mold clamping unit 12. The robot 3 selects and uses a gate opening / closing hand from the storage device 4 as a hand.

When the completion of taking out and returning the core 9 at this time is confirmed by the limit switch L1 or the like in the storage device 4, the air actuator 21 at the bottom of the core preliminary temperature adjusting device 14 is driven to push the ejecting plate 23. The core 9 is projected to the upper part through the and the parting line P is exposed. Then, the robot 3 grips the parting line P above and below the core 9 prepared for next use by the core replacement hand 10 (FIG. 3).
Take it out from No. 4 and attach it to the mold. This core 9 becomes the core 9 used this time. Then, the core 9 to be used next time is taken out from the storage device 4 and stored in the core preliminary temperature adjusting device 14. The data for specifying the core 9 to be used next time is transmitted from the control device 7 to the control device 8, and the control device 8 grasps the position of the core 9 from the data stored by teaching. Further, the core 9 housed in the core preliminary temperature adjusting device 14 is always arranged at a fixed position as viewed from the robot 3.

The core 9 to be used next time in the core preliminary temperature controller 14
The limit switch L2 detects that the
When the control device 7 confirms this, the robot 3 returns the core replacement hand to the predetermined position of the storage device 4, and further mounts the product takeout hand and stands by. The core preliminary temperature adjusting device 14 is instructed to control the temperature based on the data of the core 9 to be used next time.

With the above, the core exchange mode is completed.
Then, the next molding mode is executed. At this time, since the mounted core 9 has already been preliminarily temperature-controlled, the molding start condition in the injection molding machine 2 is quickly satisfied.

When the core pre-temperature control device 14 is provided with the cap 27 as in the second embodiment (FIG. 4), the cap 27 is aired after the core 9 is gripped by the core replacement hand 10. Removed by actuator 26. Then, the core 9 is taken out and conveyed by the core exchange hand 10.

The core pre-temperature control device 14 is used in the third embodiment (FIG. 5).
When a plurality of storage holes 18 are provided as described above, the position of the storage hole 18 stored with respect to the core 9 is stored in the control device 7. As a result, the cores 9 are sequentially taken out in the order in which they are stored. Further, the data of the preliminary temperature control regarding the core 9 is applied to the storage hole 18 in which the preliminary temperature control is performed.

The above is an example. The present invention is not limited to the specific configurations shown. For example, the heating means in the core preliminary temperature controller 14 may be a high frequency vibration.

[0030]

Since the core to be used next time is preliminarily temperature-controlled and prepared, the molding mode rises quickly after the core is replaced, and the efficiency of the molding operation is improved. Of the cores prepared according to the molding plan, only the cores that are nearing use can be accurately preliminarily adjusted in temperature, and there is no waste in temperature adjustment. Since the preliminary temperature control device is arranged close to the clamp part of the mold clamping unit, it is less likely to be cooled when the core is replaced.

By storing the core in the core preliminary temperature control device, the position of the core to be used next time is accurately determined from the viewpoint of the robot, and the robot can smoothly replace the core. Since the core pre-temperature control device is close to the mold clamping unit of the injection molding machine, the work is easy even when the core is manually replaced. When a plurality of storage holes are prepared in the core pre-temperature control device, the cores can be sequentially taken out without waiting for the temperature rise of the core even if the core replacement cycle is early. In addition, each core can be preliminarily temperature-controlled.

[Brief description of drawings]

FIG. 1 is a plan view.

FIG. 2 is a schematic perspective view.

FIG. 3 is a front view of a main part (partial cross section).

FIG. 4 is a front view (partially sectional view) of a main part in the second embodiment.

FIG. 5 is a perspective view of a third embodiment.

[Explanation of symbols]

1 Injection Molding Device 2 Injection Molding Machine 3 Robot 9 Core 10 Hand 14 Core Preliminary Temperature Control Device 18 Storage Hole 23 Extrusion Plate 27 Cap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Koki, 3580 Kobuba, Oshinomura, Minamitsuru-gun, Minamitsuru-gun, Yamanashi, FANUC Co., Ltd. Local FANUC Co., Ltd.

Claims (5)

[Claims] 1. An injection molding apparatus, characterized in that a core pre-temperature control device for pre-conditioning the temperature of the core to be used next time is provided at a fixed position of the injection molding machine body. 2. A core pre-temperature control device is provided at a fixed position of an injection molding machine main body, and a control means for controlling the temperature of each core stored according to a molding plan is provided. Molding equipment. 3. The injection molding apparatus according to claim 1, wherein the core pre-temperature adjusting device is capable of accommodating a plurality of cores. 4. The core protruding means is provided at the bottom of the core preliminary temperature control device.
The injection molding apparatus according to any one of 1. 5. The injection according to any one of claims 1 to 4, characterized in that a pressing means for axially pressing the core housed in the core preliminary temperature control device is provided. Molding equipment.