JPH04233072A - Injection molding process schedule method - Google Patents

Abstract

PURPOSE:To automatically prepare the process scheduling of rational injection molding by preferentially scheduling a work order having the same metal die and small color concentration difference concerning the injection molding process schedule method to schedule an injection molding process. CONSTITUTION:An equipment having the same metal die to be used at a work order 5 as the metal die used for the existent schedule is temporarily allocated preferentially to the above work order 5 and among these temporarily allocated work orders 5, the work orders 5 having the small color concentration difference are repeatedly selected so as to prepare the schedule of the injection molding process.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding process scheduling method for scheduling an injection molding process. When managing injection molding processes, it is desired to automatically generate an optimal schedule that takes into account mold replacement and resin replacement.

0002

2. Description of the Related Art Conventionally, when creating a process schedule for molding by attaching a mold to equipment (injection molding machine) and injecting resin into the mold, a dedicated person in charge manually created the schedule.

0003

[Problem to be solved by the invention] In this way, in the past, a dedicated person determined the process of installing a mold on equipment and performing the work (work called injection molding) based on the order. (1) The process schedule requires a huge amount of man-hours, for example, 60 pieces of equipment, 4000 types of molded products, and 10 orders.
It took 7 days to create a 10-day process schedule for 00/10 (2) It was not possible to change or modify the process schedule when the dedicated person in charge was absent (3) Comparison data between the plan and actual results (4) It is difficult to efficiently plan a schedule that takes into consideration the minimization of setups such as installing molds on equipment and changing the resin color. (5) It is difficult to make a schedule that takes into account minimizing the setup time for installing molds on equipment and replacing resin colors (5) There was a problem in that it was difficult to efficiently select a combination of molds.

[0004] The present invention provides that the same mold,
The purpose is to automatically create a rational injection molding process schedule by giving priority to those with small color shading differences.

[0005]

SUMMARY OF THE INVENTION FIG. 1 shows a block diagram of the principle of the present invention. In Figure 1, the injection molding process dispatching 3 temporarily allocates the same mold as the mold used in the work order 5 to already scheduled equipment (WS), or assigns the work order to the equipment that can start the earliest. 5 is temporarily assigned to the equipment, or the work order 5 is temporarily assigned to the equipment.
When there are a plurality of orders, the work order 5 with the smallest difference in color density or the work order 5 with the highest priority is repeatedly selected.

[0006] The work order 5 is a production order in units of lots for each process, which is generated from the order.

[0007]

[Function] As shown in FIG. 1, the present invention provides the injection molding process dispatching 3 with the injection molding process dispatching 3 that uses the molds used in the work orders 5 for each lot of each process generated from the orders placed and the already scheduled equipment (WS). Preferentially allocate equipment with the same type to the relevant work order 5, and when there are multiple temporarily allocated work orders 5, select the work order 5 with the smallest difference in color shade and sequentially allocate it to the equipment repeatedly. , I am trying to create a schedule for the injection molding process. In addition, equipment that can be started the earliest among equipment other than the prioritized equipment is temporarily assigned to work order 5, and when there are multiple temporarily assigned work orders 5, the highest priority work order 5 is selected, and injection molding I am trying to create a schedule for the process.

[0008] Therefore, it is possible to automatically create an efficient process schedule for injection molding by prioritizing work orders for molds that are the same and giving priority to molds that have a small difference in color shade.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure and operation of an embodiment of the present invention will be explained in detail with reference to FIGS. 1 to 4. FIG. 1 shows a principle block diagram of the present invention. In FIG. 1, a processing device 10 stores programs for performing various processes such as lot division, process development 2, injection molding process dispatching 3, a memory 4, a work order 5, a result 6, a work order file 7, a master file 8, etc. It consists of files.

[0010] Lot division is a process of dividing an input order into production lot orders for each lot based on preset maximum lot size and minimum lot size. The process development 2 is to develop work orders (manufacturing orders) 5 for each process based on the number of processes set in advance for the manufacturing lot order for each lot.

[0011] Injection molding process dispatching 3 temporarily allocates to the work order 5 preferentially the equipment in which the mold used in the work order 5 and the mold of the already scheduled equipment (injection molding machine, WS) are the same. or temporarily allocate the equipment that can start the earliest work order 5, and when there are multiple temporarily allocated work orders 5, select the work order 5 that has the least difference in color shade or has the highest priority (for example, earliest delivery date, etc.) It also creates a schedule for the injection molding process (described later with reference to FIGS. 3 and 4).

The memory 4 is used to store work orders 5 and the like and perform various processing. Work order 5 is a manufacturing order (work order) divided into lots for each process. The result 6 is a schematic representation of data for displaying the schedule of the work order 5 of the injection molding process generated by the injection molding process dispatching 3 (see (b) of FIG. 4). These data are displayed on the display of the terminal 9, for example, as shown in FIG. 4(b).

The work order file 7 is a file that stores the work orders 5. The master file 8 is a file that stores various data. The terminal 9 is composed of a display, a keyboard, a mouse, etc., and is used to enter orders from customers, display injection molding process schedules, etc.

Next, the operation of the entire configuration of the present invention will be explained using FIG. In FIG. 2, S1 creates a manufacturing order by manually inputting an order from the terminal 9 or from a file I/F. Here, the production order is
As shown on the right side, part numbers, quantities, delivery dates, etc. of parts are stored in association with manufacturing order numbers.

[0015] In S2, lots are divided. In this process, the manufacturing order input and created in S1 is divided into manufacturing lot orders for each lot based on a preset maximum lot size and minimum lot size. S3 develops the process. This expands the manufacturing lot orders for each lot divided into lots in S2 into manufacturing orders for each process (work order 5).

[0016] S4 is the work order developed in the process at S3. As shown in the lower part, this work order 5 corresponds to the manufacturing order number, and includes the lot number, process order, product number,
Quantity, delivery date, remaining man-hours, mold number according to this example (for example, 005), color of resin injected into the mold (for example, 300)
It is composed of etc. S5 performs injection molding process dispatching. As will be described later with reference to FIGS. 3 and 4, the injection molding process is scheduled by prioritizing the same mold for each work order and prioritizing resin with a small difference in color shade. This will be explained in detail below.

Next, the operation of the present invention will be explained in detail using FIG. In FIG. 3, S11 performs priority allocation of the same mold. This is the mold (
The equipment whose mold No. in the work order 5 in the lower row of FIG. 2 is the same as the mold of the already scheduled equipment (WS) is temporarily allocated to the work order 5 with priority. Thereby, the work (injection molding work) can be continued without replacing the mold attached to the equipment, and the time required for replacing the mold can be saved.

[0018] In S12, it is determined whether or not the process has ended. YES
In this case, priority allocation of the same mold has been completed for all work orders 5, so the process advances to S13. If NO, S11 is repeated for all work orders 5. In S13, the WS within the work order is determined. This determines one WS that can start work at the earliest among the equipment (WS) that was preferentially assigned to the work order 5 of the same mold in S11.

[0019] In S14, the shade of color is calculated. this is,
When there are a plurality of work orders 5 provisionally allocated to one WS determined in S13, the color shading (for example, color No. 300 in the work orders 5 in the lower row of FIG. 2) is extracted. S1
5 selects a task with a small difference in density from the previous task. This is, for example, work order 5 in the lower row of FIG. 2 retrieved in S14.
The color No. (shade 300) of the previous work order 5 is compared with, for example, the color No. (shade 500) of the previous work order 5, and the differences are sequentially determined.
One of the work orders 5 having the smallest difference is selected. By selecting one work order 5 with the smallest color density difference, you can eliminate the pre-work to remove the resin attached to the mold attached to the equipment (injection molding machine) and proceed with the work of the next work order 5. This allows you to save time on pre-work.

[0020] In S15, it is determined whether or not work order 5 has been completed. If YES, the process ends. NO
In this case, the process is repeated again from S11. After the work order 5 that uses the same mold as the one used in the previous work is temporarily assigned to the equipment through the above processing (S11),
Determine one piece of equipment that can start work at the earliest, and when there are multiple work orders 5 provisionally assigned to this equipment, select the one with the smallest difference in shade from the color used in the previous work and schedule it to the equipment. By repeating the steps, replace the mold,
It becomes possible to automatically create an efficient injection molding process schedule that minimizes resin removal work.

Next, the specific example shown in FIG. 4 will be explained in detail. (a) of FIG. 4 shows a flowchart, and (a) of FIG.
b) shows an example of work order allocation. Here, 001, 002, 003, 004, 005 in FIG. 4(b) represent the mold numbers, and A, B, C, D, E, F, etc. represent the work (work order 5).

In (a) of FIG. 4, confirmation processing is performed. This expands the previous schedule for the specified fixed period, as shown in the schedule M-1 in FIG. 4(b). Here, the vertical axis is equipment (injection molding machine) 1, 2, 3, 4
, the horizontal axis represents time, and the internal 001, 002, 0
03 and 004 represent the mold numbers used in the work (the mold numbers in the work order 5 in the lower row of FIG. 2).

[0023] In (a) of FIG. 4, items with the same mold are processed with priority. This is the mold number used in the final work of each equipment.
The equipment is preferentially allocated to the same work order 5. To be more specific, as shown in M-2 in FIG. 4(b), work order 5, A, B, C, D, E,
F has mold No. 001, 003, 001, 005, 00
5,006, as shown in the schedule of M-3 in FIG. 4(b), 001 of A and B.
, B's 003 are allocated as shown. Regarding the work order (M-4) that was not prioritized,
By sequentially performing (1) determining equipment within a work order, (2) assigning priority, (2) determining a work order, and (2) assigning an order, the items are allocated sequentially as shown in M-4 to M-7.

In FIG. 4(b), M-4 is M-2
The remaining work orders D, E, and F are shown after priority allocation for work order 5 of . These remaining work orders D, E, F
As shown in the figure, it is temporarily allocated to the equipment 2 that can start work as soon as possible. M-5 assigns the highest priority work order D to the equipment 2 as shown in the figure.

M-6 shows remaining work orders E and F after allocation of M-5. In response to the assignment of work order D (mold No. "005") to equipment 2 in M-5, M-7 assigns work order E of the same mold No. "005". The following assignments are made in the same manner.

[0026]

[Effects of the Invention] As explained above, according to the present invention,
The injection molding process is scheduled with priority given to the same mold as the previous work order 5, with a small difference in color density, so an efficient schedule that takes into account the characteristics of the injection molding process is automatically created. can be created. As a result, (1) a complicated schedule for the injection molding process can be automatically and quickly created;

(2) It is possible to prioritize work orders for the same mold, minimize the time required to replace molds attached to equipment, and improve work efficiency. (3) It is possible to prioritize work order 5 with a small difference in color shading, eliminate the work of removing resin, etc., and improve work efficiency. (4) With (2) and (3), manufacturing lead time (time required for injection molding) can be shortened and equipment operating rate can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a flowchart explaining the overall operation of the present invention.

FIG. 3 is a flowchart explaining the operation of the present invention.

FIG. 4 is a diagram illustrating a specific example of the present invention.

[Explanation of symbols]

2: Process development 3: Injection molding process dispatching 4: Memory 5: Work order 6: Result 7: Work order file 8: Master file 9: Terminal 10: Processing device

Claims (2)

[Claims] Claim 1: In an injection molding process scheduling method for scheduling an injection molding process, an existing schedule in which the same mold as the mold used in the work order (5) for each lot for each process generated from the order is installed. The work order (5) is tentatively assigned preferentially to the scheduled equipment (WS), and when there are multiple temporarily assigned work orders (5), the work order (WS) with a small difference in shade from the color used in the scheduled equipment (WS) is Injection molding process dispatching (3) that repeats the selection of 5) is provided, and this injection molding process dispatching (3) sequentially allocates work orders (5) to equipment to create a schedule for the injection molding process. An injection molding process scheduling method characterized by comprising: Claim 2: Tentatively allocate equipment that can be started at the earliest to work order (5) among the equipment other than the equipment that has been provisionally allocated with priority, and
) includes injection molding process dispatching (3) that repeatedly selects the highest priority work order (5) from
Injection molding according to claim 1, characterized in that the injection molding process dispatching (3) is configured to sequentially allocate the highest priority work orders (5) to equipment and create a schedule for the injection molding process. Process scheduling method.