JP2811827B2 - Production scheduling device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a production scheduling device, and more particularly to a production scheduling device for efficiently producing a plurality of types having different process procedures and processing times.

[Conventional technology]

2. Description of the Related Art Conventionally, in production scheduling, a product such as a person in charge of process progress confirms a product stagnating in each work center, and then manually creates a work instruction again. Even in the case where a computer is used for a work instruction, scheduling is performed using a dispatching rule that describes only a simple rule order, and the result is used as it is as a manufacturing plan.

[Problems to be solved by the invention]

In the conventional single-handed production scheduling described above, it is extremely difficult to sufficiently consider the current complicated production line structure and the situation in which the number of manufacturing procedures and manufacturing times differing for each product unit increase. Difficult. In addition, an enormous amount of processing time is required to predict the next load state of the equipment at each time, and only low accuracy is obtained.

Further, in the computer system, the order of execution of dispatching rules is described only in a fixed manner, so that the order of rules cannot be changed according to a change in a situation that changes during execution of scheduling. For this reason, there is a problem in that the result must be used as it is, even if there are not enough change factors, although the result is not always optimal.

[Means for solving the problem]

The production scheduling apparatus according to the present invention includes a plan information storage unit configured to store an input type, a quantity, and a delivery date given from a higher-order schedule, a progress information storage unit configured to store current progress information related to the higher-order schedule, and a production target. A product technical information storage means for storing a process procedure, an allocation facility, and a processing time for each product type, a factory information storage means for storing information about a factory facility (work center) and a factory calendar; An editing unit that extracts and edits data in accordance with a simulation execution format and stores the edited data; a simulation unit that advances an axis based on the edited data and creates a work instruction; Starting waiting lots stored in the buffer in front of the work center according to the state of the system The rules for determining the previous order
And dispatching information storage means for storing what is described for each work center in the IF-THEN format.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The operator registers necessary information in the product information file 4, factory information file 5, and dispatching information file 6 via the input terminal 1 before performing the scheduling. Information is registered in the plan information file 2 and the progress information file 3 via the input terminal 1 or an interface with another system.

FIG. 2 is a diagram showing one model of the production process. When the description is made with reference to FIG. 2, the product information file 4 is described as shown in Table 1.

In the factory file 5, information as shown in Table 2 is registered as work center information.

In the factory file 5, information such as working hours (one-time, two-time, and three-time), overtime hours, and holidays of each facility is registered as a factory calendar.

In the dispatching rule information file 6, four types of information of each work center, rules, labels, and IF-IHEN-ELSE / GOTO statements are registered. Rules include a start order determination rule that is checked from the rule with the highest rule priority,
There are two types: auxiliary rules that have a functional role to give a judgment for skipping the rule. For example,
R1: High priority R2 (P1): The margin of delivery is less than (P1) R3: No setup change is required R4 (P1): Processing time is less than (P1) R5: In-process time is long (first-in-first-out), etc. As an auxiliary rule, H1 (01): Obtain the cumulative waiting time (01) of in-process lots H2 (01): Number of in-process lots ( 01) H3 (P1,01): Number of in-process lots in process (P1) (01)
And so on.

The label indicates the jump destination to be executed by IF-THEN or the like, similarly to the label used for batches such as MS-DOS.

Table 3 is a specific description example of the IF-THEN-ELSE / GOTO statement. Table 3 shows the dispatching of the work center 1. First, the number of in-process lots in the process P1 is obtained (step). As a result, if the lot number exceeds 50 (step), the priority rule is applied (step), and if it is 50 or less (step), the delivery priority is considered (step). ... and so on.

The plan information file 2 describes a plan whose example is shown in Table 4.

The progress information file 3 describes information that 900 L1s are being processed in the second step (step 2).

Before executing the simulation, the editing unit 7
, Information on the type of input product registered in the planning information file 2 is extracted from each of the product technical information file 4, the factory information file 5, and the dispatching information file 6 and edited, and the result is edited into an edited data file 8 is stored. After that, the simulation unit 9 determines the starting order in each work center in that state based on the rules of the dispatching file 6, and proceeds with the simulation using the processing time and the production quantity in each process. This operation is continued until all the input products reach the final process. At that time, work instruction data such as the assigned equipment, the processing time, and the production amount in each passing step is written in the work instruction file 10.

FIG. 3 is a diagram for specifically explaining the dispatching process at the time of executing the simulation in FIG.
FIG. 3 (a) shows work centers 1 to 3 and buffers 1 to 3 before them, and FIG. 3 (b) shows edited data indicating the state of the buffer 1. The purpose of dispatching is to select lots to be processed from the lots L1, L2, L3, L4, L5, L6, L7 in the front buffer 1 of the work center 1 at the progress time T1 during simulation execution. Decide on one. As the process, when P1 = work center 2 is set in the step of Table 3,
Since the number of waiting lots of the work center 2 (the number of lots in the buffer 2) is 4, the waiting lots of the target work center 1 are sorted in descending order of priority by the rule of the step based on the IF statement of the step. L1, L2... L6, L7 are arranged, and the IF-THEN processing ends. Next, as a result of examining the waiting lots having a processing time of 3H or less according to the step rules, when the processing lots are L5 and L7, which of the two lots was first loaded into the buffer 1 based on the step rules is determined. Find out. As a result, the L5 that has been carried in earlier is determined to be the first to be started in the waiting lot in the buffer 1.

〔The invention's effect〕

As described above, the present invention takes into account many factors related to production at the same time, and changes the effective dispatching rules incorporating various know-how of schedule creators according to the ever-changing situation of each work center. This makes it possible to efficiently, easily, and in a short time create work instructions (such as a lot start order and start time) for each facility.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIG. 2 is a diagram showing a model of a production process, and FIG. 3 is a diagram for explaining a dispatching process at the time of executing a simulation. 1 input terminal, 2 planning information file, 3 progress information file, 4 product technical information file, 5 factory information file, 6 dispatching information file, 7 editing unit, 8 …… Edited data file, 9 ……
Simulation unit, 10 ... Work instruction file.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23Q 41/08 G06F 15/21 G05B 19/417

Claims (1)

(57) [Claims] 1. A plan information storage means for storing input type, quantity and delivery date given from a higher-level schedule plan, a progress information storage means for storing current progress information relating to the higher-level schedule plan, Process steps for each type,
Product technical information storage means for storing the allocated equipment and processing time, factory information storage means for storing information on factory equipment (work center) and factory calendar, and data of the plan information storage means in accordance with the simulation execution format An editing unit that extracts and edits and stores edited data;
Simulation means for advancing time based on the edit data and creating a work instruction; and starting priority of waiting lots stored in a buffer in front of the work center according to the state of the system during execution of the simulation means. Dispatching information storing means for storing a rule for determining each of the work centers in the IF-THEN format, wherein the simulation means is configured to execute the simulation based on the rules stored in the dispatching information storing means. A production scheduling apparatus, wherein a start order in each work center that has been in a waiting lot state stored in the buffer is determined, and a work instruction is created based on the edited data.