JPH07106574B2 - Mold changing system of molding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold changing system for a molding machine such as an injection molding machine.

[Prior Art] In a molding line of an injection molding machine, as described in JP-A-59-101240, a mold storage unit for storing molds used in a plurality of molding machines, and a mold storage unit. Some include a mold exchanging system configured to include a mold exchanging device arranged between all molding machines. This mold exchange system returns the old molds used in the molding machine to the mold storage unit by the mold replacement device, and the new molds to be replaced this time are dispensed from the mold storage unit by the mold replacement device. Then, the mold is loaded into the molding machine as the loading destination this time.

With this mold change system, the old and new molds are quickly and efficiently replaced according to the mold production schedule that defines the molds used in the molding machine and the productivity of the molds, thus improving the productivity of the molding line. Improve. The expansion of this mold change system is particularly important in the era of high-mix low-volume production.

[Problems to be Solved by the Invention] By the way, in the conventional mold exchanging system, when the planned production quantities of a plurality of molding machines are close to or close to each other, and the exchanging time zones of these machines overlap each other, for example, the exchanging of the exchanging starts. Stop the molding operation of the molding machine with the later time from the completion of the planned production quantity until the completion of the mold replacement of the molding machine preceding it, and wait for it. It is supposed to start the mold change operation.

However, as mentioned above, a certain time until the start of replacement,
When the molding operation is stopped for a long time and the stop time is extended, the resin raw material that remains in the molding machine deteriorates. It impairs the smooth restart of the molding machine following the completion of mold replacement.

Incidentally, without causing deterioration of the resin raw material staying in the above-mentioned molding machine, in order to keep the molding machine with the later mold exchange start time on standby, for example, during the standby time of the resin raw material in the molding machine, It is possible to shoot in the air. However, the blank injection of the resin raw material is not appropriate because of waste of the raw material and work of processing the raw material.

The present invention avoids overlapping of the exchange time zones of a plurality of molding machines when the planned production quantities are close to completion, and does not impair the productivity, and the necessary die replacement for all the molding machines. The purpose is to do.

MEANS FOR SOLVING THE PROBLEM The present invention relates to a mold storage unit for storing molds used in a plurality of molding machines, and an old mold used in the molding machine, which is taken out from the molding machine. Controls the mold exchanging device that returns to the storage unit, takes out the new mold used in the molding machine from the mold storage unit and carries it into the molding machine, and the exchanging operation of the mold exchanging device according to the production plan. In the mold exchanging system of the molding machine configured with the control device, the control device obtains the mold exchanging start time and the exchanging time zone of each molding machine from the production plan, so that the exchanging time is early Check the overlap of the replacement time zones in order, and when it is expected that the replacement time zones overlap, delay the replacement start time of the later molding machine until the completion of the replacement of the molding machine that precedes it, and Configured to continue the molding operation of the molding machine during that delay did.

[Operation] According to the present invention, when it is expected that a plurality of molding machines are overlapped with their mold replacement time zones, the later molding machine will set the replacement start time until the completion of the replacement of the molding machine preceding the molding machine. Delay and wait, and continue the molding operation while waiting for the delay.

For this reason, in the present invention, there is no possibility that the molding is stopped for a long time during standby and the deterioration of the resin raw material is caused, and there is no waste of the raw material or processing work by idle injection during standby.

In the present invention, the production quantity by the molding machine is larger than the initially planned quantity, but this does not impair the productivity due to the adjustment of the production plan.

That is, according to the present invention, when the production planned quantities of a plurality of molding machines are close to completion, it is necessary for all the molding machines to avoid the overlapping of the replacement time zones thereof and without impairing the productivity. Die exchange can be performed easily.

[Embodiment] FIG. 1 is a schematic view showing an embodiment of the present invention, FIG. 2 is a view showing a mold replacement time zone of a molding machine, and FIG. 3 is a flow chart showing a mold replacement procedure.

In the mold exchanging system shown in FIG. 1, 10A, 10B and 10C are molding machines, 11 is a mold storage (mold storage), 12 is a mold carrier (mold changing device), 13 is a control device, 14 is a mold.

Each of the molding machines 10A to 10C is equipped with a mold 14 to mold a molded product.

The mold storage 11 is a mold 14 used in each molding machine 10A to 10C.
To store.

The mold carrier 12 is movably arranged on a mold transfer path extending between the molding machines 10A to 10C and the mold storage 11,
The mold 14 is conveyed. That is, the mold carrier 12 is used for each molding machine.
The old mold 14 used in 10A to 10C is taken out from the molding machine 10A to 10C and returned to the mold storage 11, and the new mold 14 used in each molding machine 10A to 10C is stored in the mold storage 11 From the molding machine
Carry in to 10A-10C.

The control device 13 includes a mold 14 used in each molding machine 10A to 10C.
And, the production plan of this molding line that defines the production amount by the mold 14 is input. The control device 13 controls the replacement operation of the mold carrier 12 according to this production plan, and replaces the old and new molds 14.

At this time, the control device 13 controls the replacement operation of the mold carrier 12 as follows (see FIG. 3).

For all the molding machines 10A to 10C, the molds whose replacement schedule for the mold 14 is within 3 hours from the present time are extracted (step in FIG. 3).

Mold 14 in each molding machine 10A-10C extracted above
The exchange start time and the exchange time zone are obtained, and the overlap of the exchange time zones is checked in order from the earliest exchange start time (step in FIG. 3).

It is determined whether or not the exchange time zones of the molding machines 10A to 10C overlap (step in FIG. 3).

As a result of the above, when it is expected that the exchange time zones will overlap,
The replacement start time of the later molding machine 10A-10C is delayed until the completion of the replacement of the preceding molding machine 10A-10C, and the molding operation of the later molding machine 10A-10C is continued during the delay (third part). Steps in the figure).

This is carried out for all of the above molding machines 10A to 10C (steps in FIG. 3).

As a result, each molding machine 10A-10C that overlaps during the replacement time
The die replacement time is gradually delayed from the earliest die replacement time as shown in FIG.

For the molding machines 10A to 10C, which continue the molding operation by the old mold 14 during the delay of the mold replacement time, the production amount will be increased, so the production planned quantity is adjusted. (Step in FIG. 3).

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

According to the above embodiment, when it is expected that a plurality of molding machines 10A to 10C overlap in their mold exchanging time zones, the slower molding machines 10A to 10C are the same as those of the preceding molding machines 10A to 10C. The exchange start time is delayed until the exchange is completed, and it waits,
And, while waiting for the delay, the molding operation is continued.

For this reason, in the above-described embodiment, there is no possibility that the molding will be stopped for a long time during standby and the deterioration of the resin raw material will not be caused, and that idle injection during standby will not result in waste of the raw material or processing work.

In the above embodiment, the production amount by the molding machines 10A to 10C is larger than the initially planned amount, but this does not impair the productivity due to the adjustment of the production plan.

That is, according to the above embodiment, when the completion of the production plan quantity is approaching for the plurality of molding machines 10A to 10C, the overlapping of the replacement time zones thereof is avoided, and without impairing the productivity, all It is possible to perform the necessary mold exchange for the molding machines 10A to 10C.

[Effects of the Invention] As described above, according to the present invention, when the planned production quantities of a plurality of molding machines are close to completion, it is possible to avoid the overlapping of the replacement time zones thereof and to prevent the productivity from being impaired. , It is possible to perform necessary mold replacement for all molding machines.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a die exchange time zone of a molding machine, and FIG. 3 is a flow chart showing a die exchange procedure. 10A, 10B, 10C …… Molding machine, 11 …… Mold storage (Mold storage), 12 …… Mold carrier (mold changer), 13 …… Control unit, 14 …… Mold.

Claims (1)

[Claims] 1. A mold storage unit for storing molds used in a plurality of molding machines, and an old mold used in the molding machine is taken out from the molding machine and returned to the mold storage unit, and the molding machine is then returned. A mold exchanging device for taking out a new mold used in the above from the mold storing section and carrying it into the molding machine, and a control device for controlling the exchanging operation of the mold exchanging device according to the production plan. In the mold change system of the molding machine, the control device obtains the mold start time and the change time zone of each mold machine from the production plan, and the change time zone overlaps in order from the earliest change start time. When it is expected that the replacement time zones will overlap, the replacement start time of the later molding machine is delayed until the completion of the replacement of the molding machine that precedes it, and the molding operation of the later molding machine is delayed. Mold exchange system of the molding machine Temu.