JPH04298318A - Temperature control device of injection mold - Google Patents

Abstract

PURPOSE:To eliminate the need for manual operation of open and close of valve and for temperature setting of hot water when production is started or after a mold is replaced by performing open-close control of a valve connected to a water pipe to each cooling channel of a mold and temperature control of a hot water device. CONSTITUTION:A host computer 5 is programmed so as to integrate all production program such as drive control of an injection molding machine and an automatic replacement device of molds 1, 2 in addition to command to a local computer 4. At the start of production, assuming that the kind of the mold 1, wherein the computer 5 gives a command to the computer 4, is X1 and cooling condition given by the computer 5 is X11, heating temperatures of hot water devices 3a, 3b are controlled at 80 deg.C and 60 deg.C respectively and at the same time solenoid valves V1, V2, V3 and V6 are set OPEN and solenoid valves V4 and V5 are set CLOSE.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION The present invention relates to a device for controlling the temperature of an injection mold.

0002

[Prior Art] In order to control each part of the injection mold to a predetermined temperature, a plurality of cooling water channels are usually formed in an injection mold. Piping for various types of cooling water such as water is connected. Then, by setting the valves connected to each piping system to open or close, the cooling water to be passed through each channel of the mold is selected, and by further adjusting the temperature of the hot water, it is used for molding. The mold is cooled to a temperature that corresponds to the molding conditions.

[0003] The selection of the type of cooling water and the temperature setting of the hot water can be achieved, for example, by connecting the frozen water piping and tower water piping to two of the four cooling water passages formed in the mold with valves, respectively. connection through the opening and closing of each valve.
Depending on the closure, frozen water can be passed through one channel and tower water can be passed through the other channel, or vice versa, and warm water can be passed through the other two cooling channels. The temperature is set to an appropriate temperature by adjusting the water heater connected to the piping.

[0004] Conventionally, the opening/closing operations of valves and the adjustment of water heaters, etc., as described above, are conventionally performed by using a comparison table created based on the type of mold and its molding conditions, etc. A bulletin board is posted nearby, and workers manually perform the work based on the chart.

[0005]

[Problems to be Solved by the Invention] Incidentally, an injection mold is connected to various cooling pipes such as hot water, frozen water, tower water, etc. on its fixed side and moving side, and each cooling pipe is Since the system requires a round trip route for water supply and return, there are a large number of valves, and it is extremely difficult to open and close them while comparing and checking the comparison table and each cooling piping system. Not only does the opening/closing operation take a lot of time, but also may lead to errors in the opening/closing operation. Additionally, since adjustments to the water heater are made while looking at comparison tables, mistakes may occur.

[0006]

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned conventional problems, and the configuration thereof will be explained with reference to FIG. 1 corresponding to an embodiment.
Cooling water pipes 10a...10d are connected to each of a plurality of cooling water channels 1a...1d formed in the injection mold (fixed side mold) 1, and each cooling water pipe is connected to each of the cooling water pipes 10a...10d. Valve V1...V6 and cooling water pipe 10a
...At least one pipe 10a, 10 of 10b
Water heaters 3a, 3b connected to b, and the water heaters 3a,
3b, and control means (for example, a local computer) 4 for controlling the opening and closing of each valve V1...V6. It is characterized by being configured to perform the above-mentioned temperature control and opening/closing control based on related signals.

[0007]

[Function] The host computer 5 is configured to specify the type and temperature of cooling water to be supplied to each cooling water channel of the mold in accordance with the production plan of injection molded products, and to determine the type and temperature of cooling water to be supplied to each of the cooling water channels of the mold, and By keeping a file for all molds, each time a mold is replaced or the molding conditions for the same mold are changed, a command signal corresponding to the cooling conditions after the replacement or change is sent locally from the host computer 5. The information is sent to the computer 4, and depending on the cooling conditions, each valve V1...V6 is opened/closed and the water heaters 3a, 3 are opened/closed.
b temperature adjustment is automatically set.

[0008]

Embodiments Examples of the present invention will be described below based on the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, including a piping system diagram and a block diagram of a control system. Four systems of cooling water channels 1a...1d are formed in the mold 1 on the fixed side. The respective cooling waterways 1a...1d are provided with piping 10a...10 by cooling jackets 11, 12, respectively.
d is connected, and the cooling waterways 1a and 1b are supplied with warm water (10
~90°C) is introduced via electromagnetic valves V1 and V2.

[0009]Furthermore, the cooling water channel 1c is filled with frozen water (10~
20° C.) is conducted via the solenoid valve V3, or tower water (20-30° C.) is conducted via the solenoid valve V5. Further, tower water is introduced into the cooling water channel 1d via an electromagnetic valve V6, or frozen water is introduced via an electromagnetic valve V4. In addition, the cooling jacket 11
and 12 means that a plurality of pipe screw holes are formed in a fixed plate on the mold side and an injection molding machine (not shown) side in a positional relationship corresponding to each other, and each screw hole on both It has a structure in which cooling water channels 1a...1d and cooling water pipes 10a...10d of the mold are connected to the mold, respectively, and when the mold is clamped to the injection molding machine, both plates are in watertight contact. , cooling channel 1a of mold 1...
1d and the corresponding cooling pipes 10a...10d are configured to communicate with each other.

Although the above cooling water piping system is shown only on the water supply side of the mold 1 on the fixed side, similar piping is connected to the water return side as well. Furthermore, four systems of cooling water channels are formed in the mold 2 on the moving side, and piping similar to that of the mold 1 is connected to the water supply and water return sides thereof. however,
In order to simplify the explanation, only the water supply side of the mold 1 on the fixed side will be shown below.

On the other hand, the host computer 5 has information on each of the cooling channels 1a, . . . 1 of the mold 1, as shown in the table of FIG.
A table is filed in which the type and temperature of the cooling water to be passed through each of the molds used for molding are described for each of the various molds used for molding. Then, each time a mold is replaced or molding conditions for the same mold are changed, the host computer 5 calls up data corresponding to the mold replacement or condition change, and sends setting signals based on the contents to the local computer. Send to 4.

The local computer 4 operates each electromagnetic valve V, which will be described later, in accordance with a signal from the host computer 5.
1: Programmed to control opening/closing of V6 and temperature control of water heaters 3a and 3b. Further, when a command signal is transmitted from the host computer 5 to indicate mold replacement, production completion, abnormal stop of the injection molding machine, etc., all the electromagnetic valves V1 to V6 are set to close.

[0013] In addition to issuing instructions to the local computer 4, the host computer 5 also integrates all production plans such as drive control of the injection molding machine and the automatic changing device (not shown) for the molds 1 and 2. is programmed to do so. Next, the operation of the embodiment of the present invention will be described with reference to FIG. 2 shown above. First, at the start of production, if the type of mold 1 that the host computer 5 instructs the local computer 4 to specify is X1, and its cooling condition is X11, then
The heating temperatures of water heaters 3a and 3b are 80°C and 60°C, respectively.
At the same time, the electromagnetic valves V1, V2, V3, and V6 are set to "open," and the electromagnetic valves V4 and V5 are set to "closed." By this operation, hot water of 80° C. and 60° C. is fed to the mold cooling channels 1a and 1b, respectively. Further, frozen water is fed to the cooling waterway 1c, and tower water is fed to the cooling waterway 1d. Then, when the temperature of the mold 1 becomes stable, injection molding is started and a molded product of a predetermined number of shots is manufactured.

Next, the molding conditions for the molded product are changed, and the type of mold 1 remains as X1, but only the cooling conditions are changed to, for example, X1.
2, the solenoid valves V3 and V6 are set to "closed" and the solenoid valves V4 and V5 are set to "open", so that tower water flows into the cooling water channel 1c of the mold and the cooling water channel 1d.
Frozen water is supplied to the Furthermore, when a command signal to change the molded product, that is, change the type of mold 1, is sent to the local computer 4, first all electromagnetic valves V1...V6 are set to "closed", and then the mold Replacement work will be carried out. The type of mold 1 after this exchange is
2, and assuming that the cooling condition is X21, the heating temperatures of the water heaters 3a and 3b are controlled to 70°C and 50°C, respectively, and the electromagnetic valves V1, V2, V4 and V
5 is "open" and solenoid valves V3 and V6 are "closed"
are set respectively. Through this operation, hot water of 70°C and 50°C is sent to the cooling channels 1a and 1b of the replaced mold, respectively, and tower water is sent to the channel 1c, and frozen water is sent to the channel 1d. Ru. From then on,
Injection molding is started in the same manner as before.

As described above, at the start of production and every time a mold is replaced or its cooling conditions are changed, the water heater 3a is
, 3b and the opening/closing operations of the solenoid valves V1, . . . , V6 are automatically performed. Then, when the production of all molded products is completed, the driving of the water heaters 3a and 3b is stopped, and all the electromagnetic valves V1...V6 are turned off.
Closed”. Further, when any abnormality occurs in the injection molding machine or the like, the cooling operation is similarly stopped, thereby preventing the temperature distribution of the mold 1 from changing.

[0016] In the above embodiments of the present invention, an example was explained in which the present invention was applied in a case where the number of cooling water for the mold was four: hot water, frozen water, and tower water. Of course, the present invention can also be applied to other molds that require a plurality of cooling tubes. Also,
The number of cooling water pipes connecting the water heater is 1 or 3.
The present invention can also be easily applied to cases where the number is more than 100 yen.

[0017]

Effects of the Invention As described above, according to the present invention, a control means such as a local computer that controls the opening and closing of the valves connected to the water pipes to each cooling channel of the mold and controls the temperature of the water heater. and its control means are:
The above-mentioned opening/closing control and temperature control are performed based on signals related to the type of mold used for molding and its cooling conditions, which are sent from the host computer according to the production plan, etc., so that After changing molds, there is no need to manually open/close valves or set the temperature of hot water, improving the FM of the entire injection molding process.
It becomes possible to realize S. This dramatically improves productivity and significantly reduces costs.

[Brief explanation of drawings]

[Figure 1] Configuration diagram of an embodiment of the present invention

[Figure 2] A table showing the contents of the table to be filed in the host computer 5 and the contents controlled by the local computer 4.

[Explanation of symbols]

1... Mold (fixed side) 1a...1d...Cooling waterway 10a...10d...Cooling water piping V1...V6...Solenoid valve 2... Mold (moving side) 3a, 3b... water heater 4...Local computer 5...Host computer

Claims (1)

[Claims] 1. A cooling water pipe connected to each of a plurality of cooling water channels formed in an injection mold, a valve connected to each of the cooling water pipes, and at least one of the cooling water pipes. It is equipped with a water heater connected to one pipe, and a control means for controlling the temperature of the water heater and controlling the opening and closing of each of the above-mentioned valves. A temperature control device for an injection mold, which is configured to perform the above temperature control and opening/closing control based on signals related to conditions.