JPH0698556B2 - System control method based on production plan - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a system control method based on a production plan in a flexible production system including a numerically controlled machine tool, a carrier device, and a management computer that integrally manages them. .

(Prior art) With the recent diversification of needs, there is an increasing need for high-mix low-volume production in manufacturing plants, and flexible manufacturing systems (FM
S) has been introduced and put into practical use.

Therefore, at the manufacturing plant, a production plan for the entire plant is created and production instructions are given to individual machines and systems.
In the above, the method of creating the processing schedule data based on the production plan and registering it in the FMS control computer and then operating the system has been adopted.

However, the production plan changes every moment, and when the production plan was changed, it was necessary to change the machining schedule data of the FMS management computer or reconstruct the machining schedule data.

FIG. 7 is a block diagram of a conventional system control system based on a production plan. FIG. 8 is a flowchart showing a conventional system control method based on a production plan.

The conventional technique will be described below.

In FIG. 7, this method uses a CRT 9 and a keyboard 10 to produce a production plan data, which is a macro plan to be processed by the system, and a production plan creation unit 1
A machining schedule data creation unit 4 for designating the order and number of machining in the FMS based on the production plan via the CRT 7 and the keyboard 8; a machining machine allocation unit 6 for allocating machining machines based on the machining schedule data; At the work setting station, the CRT 11 displays the mounting order of the parts, and the work instruction display unit 5 instructs the worker.

Based on FIG. 8, the procedure first creates machining schedule data by the CRT 7 and keyboard 8 of the FMS management computer based on the production plan created offline (step S21). After the system operation is started, if the production plan is changed (step S22), the machining schedule data is changed again. On the other hand, if there is no change in the production plan, it is checked whether or not the machining schedule is completed (step S23), and if completed, the process is ended. If not completed, a work instruction is created based on the machining schedule data (step S24), and which part is to be set next is displayed on the CRT 11 installed in the work setting station (step S25). . The operator sets the parts according to the instruction and puts them into the system. Next, of the parts in the system, one of the parts that has been introduced into the system from the work setting station and the part in the process of machining, for example, three parts
The machining procedure is determined from the parts that have been machined only in the process (step S26), and if there is a vacant machine among the numerically controlled machine tools (step S27), the machining order is determined for that machine. The parts are transported and processed (step S28).

Repeat the above procedure until the processing schedule is complete.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, when the machining schedule data is changed or reassembled, the system operation rate is lowered and the production plan is changed every time. There is a problem that it is very troublesome because the worker has to change the machining schedule data.

The present invention has been made under the circumstances as described above, and an object of the present invention is to provide a production plan capable of suppressing a decrease in system operating rate and reducing labor of a worker when a production plan is changed. It is to provide a system control method based on the above.

(Means for Solving the Problem) The present invention relates to a system control method based on a production plan in a flexible production system including a numerically controlled machine tool, a carrier device, and a management computer that integrally manages them. The purpose of the above is to automatically search for parts that have not been put into the system from the production plan based on the input production plan, and
It is checked whether jigs or pallets can be used, a list of parts that can be actually set is created in the work setting station in order of priority, and the work is displayed to the worker by displaying it on the display means provided in the work setting station. This is achieved by giving a throwing order instruction. In addition, based on the input production plan, the machining schedule data is automatically created for each machine group every time a newly introduced part or a part in the process is generated from the part group introduced in the system. It is achieved by allocating the highest-priority part to the machine at the time of creating and numerically controlling the machine tool when the machine tool is vacant or when the machining is completed.

(Operation) According to the present invention, based on the input production plan, a list of parts that can be set without being put into the system is automatically created and displayed in order of priority to the operator. Work placement sequence is instructed, and machining schedule data is created every time a newly introduced part or a part in the process occurs, and the part with the highest priority is assigned to the numerically controlled machine tool to perform the work processing procedure. By making a decision, it is possible to flexibly respond to changes in the production plan.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

FIG. 1 is a block diagram for realizing the system control system based on the production plan of the present invention.

In the figure, the CRT 7 and keyboard 8 in the production planning section 1
The production plan data, which is a macro plan to be machined by the system, is created via. Here, conventionally, an operator inputs a processing order and the number of pieces to be processed from the keyboard 8 based on the created production plan, creates processing schedule data, and creates a work instruction based on the processing schedule data. Although it is displayed, in the present invention, the subsequent processing is automatically performed based on the input production plan. That is, when the production plan is entered,
The progress data creation unit 2 records and manages the progress status of each part. Based on the production plan created by the production plan creation unit 1, the work instruction data creation unit 3 creates data for searching and instructing workable parts at the work setting station. In addition, the machining schedule data creation unit 4, which has input the progress data created by the progress data creation unit 2 and the work instruction data created by the work instruction data creation unit 3, divides the machinable parts into machine groups based on them. The work instruction display unit 5, which has registered the work instruction data and has entered the work instruction data, displays a list of parts that can be worked by the worker based on the work instruction display unit 5 on the CRT 9 of the work setting station.
To display. Further, the processing machine allocation unit 6 searches for an empty machine based on the processing schedule data created by the processing schedule data creation unit 4 and allocates the processing machine.

FIG. 2 is a flowchart showing a system control method based on the production plan of the present invention. FIG. 3 is a diagram showing production planning data. FIG. 4 is a diagram showing progress data. FIG. 5 is a diagram showing work instruction data. FIG. 6 is a diagram showing processing schedule data.

Hereinafter, the procedure of the present invention will be described in detail with reference to FIGS. 1 to 6.

The production plan is a macro plan of the work to be machined by the system, and the one in which the actual machining sequence has not been decided yet. First, this production plan data is input by the CRT 7 and keyboard 8 of the FMS management computer. (Step S1). Here, as the production plan data, as shown in FIG. 3, the part number of the part to be machined, the number of processes, the number of machining, the priority mark, and the input date are input. In particular, the priority mark is expressed by a numerical value, and the smaller the number, the higher the priority, and the higher the priority, the higher the priority.

When the production plan is input in this manner, the progress data shown in FIG. 4 is created. Here, the initial value is input (blank display) before the system starts operating, but a mark (@ is displayed every time the material is put in from the work setting station and enters the system, and the process proceeds in the machine (processing is completed). ) Is printed. With such a mark, it is recorded which process is completed for each unit of each product number (step S2). For example, in Fig. 4, part number A12345
The progress data of is 6 for the first and second parts.
The process has been completed, and the third part has completed 4 processes, indicating that the 5th process is currently being processed.

Next, it is checked by comparing the production plan table with the progress data whether or not all the production plans have been completely processed (step S3). If the result of the check is that the processing has been completed, the processing ends. On the other hand, if it has not been completed, the parts in which the material has not been input to the system are searched for in the production planning data, and a list of new input work is created (step S4). Then, from the new input work list, a list of jigs and pallets that are ready, that is, those that are ready for use at that time is created (step S
Five). It is checked whether or not there is anything ready (step S6), and if there is any, work instruction data as shown in FIG. 5 is created (step S7). At this time, they are arranged in descending order of priority. Further, the work instruction data is further displayed on the CRT 9 installed in the work setting station (step S8). The work instruction data is, for example, as shown in FIG. 5, product number, process, serial number (for example, 1/10 means lot.
This table is a set of parts that can be set, and is displayed in descending order of priority. By looking at this list, the operator selects the part to be set next.

Next, every time a part that has been put into the system or a part that has been machined during one process, that is, only one process out of three processes, occurs, the machining schedule data as shown in FIG. Create (Step S
9). This data means, for example, that for machine No. 1 shown in Fig. 6, 1 step of B12346, 2 steps of A12345, and 1 step of C13347 were allotted. No. 1 has not decided what to process.

Next, when the machine is empty or when the processing is completed (step S10), the processing schedule data is referred to in order to determine what is to be processed next. At that time, the item having the highest priority, that is, the item having the smallest numerical value of the priority item has the first priority, and the item having no priority designation has the priority placed on the higher order of the machining schedule data. Therefore, based on such a rule, parts are allocated to a predetermined machine and processed (step S11). For example, in FIG. 6, A1234
Since the second step of 5 has a priority value of "1", it is assigned to machine No. 1 with the highest priority.

The above procedure is repeated until the entire production plan is completed.

(Effects of the Invention) As described above, according to the system control method based on the production plan of the present invention, the machining schedule data is automatically updated when the production plan is changed, and the instruction of the order of inputting the workpieces and the workpiece machining order are By making a decision, it is possible to flexibly respond to changes in the production plan, saving the labor of workers.
As a result, the system can be operated without lowering the system operation rate.

[Brief description of drawings]

1 is a block diagram for realizing the system control system based on the production plan of the present invention, FIG. 2 is a flowchart showing the system control system based on the production plan of the present invention, FIG. 3 is a diagram showing production plan data, FIG. Figure 4 shows the progress data,
FIG. 5 is a diagram showing work instruction data, FIG. 6 is a diagram showing machining schedule data, FIG. 7 is a block diagram for realizing a conventional system control system based on a production plan, and FIG.
The figure is a flowchart showing a conventional system control method based on a production plan. 1 ... Production plan creation section, 2 ... Progress data creation section, 3 ...
… Work instruction data creation unit, 4 …… Machining schedule data creation unit, 5 …… Work instruction display unit, 6 …… Processing machine allocation unit, 7,9,11 …… CRT, 8,10 …… Keyboard.

Claims (2)

[Claims] 1. In a flexible production system including a numerically controlled machine tool, a carrier device, and a management computer for centrally managing them, the system automatically selects from the production plan based on the input production plan. In addition to searching for parts that have not been placed in the machine, checking whether jigs and pallets can be used, a list of parts that can actually be set is created in the work setting station in order of priority, and the display provided on that work setting station A system control system based on a production plan, characterized in that the worker is instructed to input a work input order. 2. In a flexible production system including a numerically controlled machine tool, a carrier device, and a management computer for centrally managing them, parts automatically put into the system based on an input production plan. Whenever a newly introduced part or a part in the process is generated from the group, machining schedule data is created for each machine group, and the highest priority is given when the numerically controlled machine tool is available or when machining is completed. A system control method based on a production plan characterized by allocating parts to a machine and determining the work machining sequence.