JP2003326574A - Temperature monitor for mold clamping device in injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature monitor for a mold clamping device in an injection molding machine which does not obstruct a mold replacing operation and brings about no possibilities of causing damage and monitors the internal temperature of the mold clamping device to ensure the molding process after stabilizing the temperature of the mold clamping device. <P>SOLUTION: This device comprises one or a plurality of temperature sensors (3 and 4) installed inside the mold clamping device (10) of an injection molding machine and a control panel (6) which displays the temperature detected by the temperature sensors (3 and 4) on the display of a controller (7) for a control process. The control panel (6) shows the settings of a unit time (T) and a tolerable fluctuating temperature range (K), and measures the fluctuations of a detected temperature by the temperature sensors (3 and 4) in the set unit time (T) and judges whether or not the detected temperature stays in a stable temperature area depending upon whether or not the fluctuations of the detected temperature fall within the set tolerable fluctuation temperature range (K) and displays the results of the judgement on the display of the controller (7) for a control process. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine in which molding is started after the temperature of the mold is raised by a temperature controller to stabilize the temperatures of the mold and the mold clamping device as a whole. The present invention relates to a temperature monitoring device for a mold clamping device in an injection molding machine that monitors the temperature of the device.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, there has been a mold temperature monitoring apparatus as shown in FIG. In FIG. 4, 1 is a fixed mold, 2 is a movable mold, 3 and 4 are temperature sensors incorporated in the mold, and the outputs of the temperature sensors 3 and 4 are output cables 5 respectively. A controller 7 is connected to the control panel 6 via the controller 7, and the measured temperature is displayed on the screen of the controller 7. 8
Is a fixed plate for mounting the fixed mold 1, 9 is a movable plate for mounting the movable mold 2, and 10 is a mold clamping device of the injection molding machine. In addition, 11 is a mold temperature controller, 12 is a frame, 13
Is an injection device, and 14 is a tie bar.

In the above structure, the temperature of the die is detected by the temperature sensor 3 attached to the fixed die 1 and the temperature sensor 4 attached to the movable die 2, and the operator is
By looking at the screen of the controller 7 capable of monitoring the detected temperature, the temperature of the mold can be known in real time.

[0004]

The conventional mold temperature monitoring device is configured to detect only the mold temperature, and monitors the temperature of the fixed plate 8 and the movable plate 9 around the mold. It is not possible. The size and structure of the mold generally differ depending on the molded product, and it is necessary to replace the mold every time the molded product to be manufactured is changed. Therefore, the temperature sensors 3 and 4 are attached to the mold for molding. Things are rare.
This is because if the temperature sensors 3 and 4 are attached to the mold, removal and reattachment of the temperature sensors 3 and 4 and the output cable 5 during replacement of the mold will hinder the replacement work and may cause damage. Because there is.

In the general-purpose molding field centered on miscellaneous goods, an operator can mold a high-quality molded product without knowing the mold temperature, and the mold temperature monitor device as described above is used in the injection molding machine. There was no need to equip. On the other hand, in the field of ultra-precision molding such as optical disks, it is preferable to start molding after the temperature of the mold and mold clamping device has stabilized.
The temperature control of molds and mold clamping devices is a major theme for quality control of molded products. This is because if the mold temperature or mold clamping device temperature changes during continuous molding, the resin filling property into the mold and the mold clamping force may change slightly, resulting in adverse effects on the molded product. is there.

Generally, the fixed mold 1 and the movable mold 2 are
It is precisely controlled to the set temperature by the dedicated mold temperature controller 11, and the temperature rise time from room temperature to about 100 ° C. is short at about 20 minutes. However, as can be understood from the mold temperature rise curve and the fixed platen temperature rise curve shown in FIG.
The fixed plate 8 and the movable plate 9 are affected by heat from the fixed mold 1 and the movable mold 2, so that the fixed mold 1 and the movable mold 2 are
Even after the temperature of the mold composed of is stable, the temperature may continue to rise, and it may take about 1 hour until the temperature stabilizes. At present, the worker does not have a means for monitoring the temperature of the fixed platen 8 and the movable platen 9, and there is a possibility of starting the molding without knowing that these temperatures have not reached the stable range, and as a result, This leads to inconsistent molding quality.

The present invention has been made in order to solve the above-mentioned problems of the conventional ones, and does not interfere with the work of exchanging molds, and there is no risk of damage to the mold clamping device. An object of the present invention is to obtain a temperature monitoring device for a mold clamping device in an injection molding machine, which can monitor the temperature and perform molding after the temperature of the mold clamping device is stabilized.

[0008]

In order to achieve the above object, a temperature monitoring device for a mold clamping device in an injection molding machine according to the present invention is one or more installed in the mold clamping device of the injection molding machine. And a control panel for controlling the display of the temperature detected by the temperature sensor on the screen of the controller.

According to this structure, the temperature in the mold clamping device is stabilized by monitoring the temperature in the mold clamping device without any hindrance during the mold replacement work and the risk of damage. Molding can be performed.

Further, the control panel is set with a unit time (T) and a permissible fluctuation temperature range (K), and measures the fluctuation of the temperature detected by the temperature sensor in the set unit time (T), Depending on whether or not the fluctuation of the detected temperature is within the set allowable fluctuation temperature range (K), it is determined whether the temperature is within the temperature stable region or outside the temperature stable region, and the result of the determination processing is displayed on the screen of the controller. Display control.

According to this structure, it is possible to determine whether the temperature variation in the mold clamping device is within the temperature stable region or outside the temperature stable region, and molding can be performed after the temperature of the mold clamping device is stabilized. .

Further, the control panel controls the display of the set unit time (T) and the allowable fluctuation temperature range (K) on the screen of the controller, and repeats the determination processing every unit time (T).

With this configuration, it is possible to set an arbitrary unit time (T) and an allowable fluctuation temperature range (K) according to the mold clamping device, and it is possible to constantly repeat the determination process every unit time.

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described first.
When the temperature of the mold attached to the injection molding machine is raised by the temperature controller, it takes more time until the temperatures of the mold and the mold clamping device as a whole are stabilized even after the temperature reaches the set temperature. It is desirable to start molding after these temperatures have stabilized,
At present, it is difficult to judge when it is stable. According to the present invention, a temperature sensor is attached to a mold clamping device of a molding machine, a temperature change amount is measured within a unit time, and if the change amount falls within a certain reference value, it is considered that the temperature is in equilibrium, and anyone starts the molding. It is a temperature monitoring device that can objectively grasp the possible timing.

In the structure of the present invention, the temperature sensor mounted on the fixed platen and / or the movable platen of the mold clamping device detects the temperature of the fixed platen and the movable platen, and the detected temperature is controlled by the controller or the like via the control panel. Can be monitored by the display screen,
Moreover, it is possible to calculate and compare the fluctuation amounts of these temperatures per unit time and display on the controller or the like that "the temperature is within the stable temperature range or is changing".

(Embodiment) A specific embodiment of the present invention will be described below. FIG. 1 is a diagram illustrating a temperature monitoring device of a mold clamping device in an injection molding machine according to an embodiment of the present invention. As shown in FIG. 1, the mold clamping device 10
The temperature sensors 3 and 4 are attached to the fixed plate 8 and the movable plate 9, respectively. Output cables 5 for outputting signals are connected to the temperature sensors 3 and 4, respectively, and are wired up to a control panel 6 of the injection molding machine. In the control panel 6,
The output signals of the temperature sensors 3 and 4 are processed, and the temperatures of the fixed board and the movable board are numerically displayed on the screen display section of the controller 7.

On the screen of the controller 7, as shown in the controller screen monitor display portion of FIG. 2, the "time setting T" for measurement and the "permissible fluctuation temperature range" are measured with respect to the fixed plate temperature rise curve shown in FIG. There is a field in which “K” can be set, and the operator can arbitrarily set a necessary numerical value here. As a setting example, when the time setting T = 60 (seconds) and the allowable fluctuation temperature range K = 2 ° C. are set, the control panel 6 causes the fixed board 8 and the movable board 9 to move.
Is detected by the temperature sensors 3 and 4 for 60 seconds, and the variation in the detected temperature during this period, that is, the difference δ between the maximum temperature value and the minimum value (see FIG. 3) is calculated, and the difference δ is 2 ° C.
In the following cases, as shown in FIG. 2, the controller 7 screen displays “inside the temperature stable area”, and when the temperature is higher than 2 ° C., the controller 7 screen displays “outside the temperature stable area”. It This process is repeated every 60 seconds.

Incidentally, such a processing function can be substituted by either the fixed platen 8 side or the movable platen 9 side. Further, the judgment display may be any of characters, numerical values, pictograms, and alarms. Furthermore, the type and type of temperature sensor does not matter. The temperature display / judgment display may be a place other than the screen of the controller 7. Further, the temperature measuring portion may be an arbitrary place of the mold clamping device or a mold other than the fixed platen 8 and the movable platen 9.

Therefore, according to the above-described embodiment, each temperature measured by the temperature sensors 3 and 4 attached to the fixed plate 8 and the movable plate 9 of the mold clamping device 10 can be monitored in real time, and the fixed plate 8 can be used. By comparing the fluctuation amounts of these temperatures per unit time regardless of the temperature of the movable plate 9 and the temperature of the movable plate 9 and adding a function of notifying whether the temperature is in the stable range or for some reason, the operator It is possible to objectively determine whether or not the molding can be started, and thus it is possible to suppress the influence of the temperature change of the mold clamping device on the quality of the molded product. Further, since no device is added to the mold, there is no risk that the device will be an obstacle or damage during the mold replacement work.

[0020]

As described above, according to the present invention, one or a plurality of temperature sensors installed in the mold clamping device of the injection molding machine and the temperature detected by the temperature sensors are displayed on the screen of the controller. Since it has a control panel for display control, it does not interfere with the mold replacement work and there is no risk of damage, and the temperature inside the mold clamping device is monitored to ensure that the temperature of the mold clamping device stabilizes before molding. It can be carried out.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a temperature monitoring device of a mold clamping device in an injection molding machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a display screen of a controller 7 of FIG.

FIG. 3 is a diagram showing a temperature rise curve of the mold clamping device 10 (fixed plate) of FIG. 1.

FIG. 4 is a configuration diagram of a mold temperature monitoring device according to a conventional example.

FIG. 5 is a diagram showing a comparison between temperature rise curves of the mold shown in FIG. 4 and a stationary platen.

[Explanation of symbols]

1 fixed side mold, 2 movable side mold, 3, 4 temperature sensor, 5 output cable, 6 control panel, 7 controller, 8 fixed plate, 9 movable plate, 10 mold clamping device, 11
Mold temperature controller, 12 frame, 13 injection device, 14
Tie bar.

Claims (3)

[Claims] 1. One or a plurality of temperature sensors (3, 4) installed in a mold clamping device (10) of an injection molding machine and a controller (7) for controlling the temperature detected by the temperature sensor.
And a control panel (6) for controlling the display on the screen of the temperature monitor of the mold clamping device in the injection molding machine. 2. The temperature monitoring device for a mold clamping device in an injection molding machine according to claim 1, wherein the control panel (6) is set with a unit time (T) and an allowable fluctuation temperature range (K). , Measuring the fluctuation of the detected temperature by the temperature sensor (3, 4) in the set unit time (T), and determining whether the fluctuation of the detected temperature is within the set allowable fluctuation temperature range (K). A temperature monitoring device for a mold clamping device in an injection molding machine, which determines whether the temperature is within the temperature stable region or is outside the temperature stable region and controls the display of the result of the determination process on the screen of the controller (7). 3. The temperature monitoring device for a mold clamping device in an injection molding machine according to claim 2, wherein the control panel (6) sets the set unit time (T) and the allowable variation temperature range (K) to the set unit time (T). A temperature monitoring device for a mold clamping device in an injection molding machine, wherein display control is performed on a screen of a controller (7) and the determination process is repeated for each unit time (T).