JPH0516983B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a process control method in an FMS (Flexible Manufacturing System), and in particular, the present invention relates to a process control method in an FMS (Flexible Manufacturing System). The present invention relates to a process management method that automatically calculates a processing schedule based on data collated with the data and sets the branching and merging connections of work in each part. Recently, factory automation has progressed,
We are entering an era of FMS, which does not rely on the traditional maximum production method but responds flexibly to needs in terms of quantity and type. If it relies on thinking, there will be major deficiencies, and if the creation standards are centered only on the work side, machine side, or tool side, there is a strong tendency for it to become biased and inadequate. I came. In the FMS process, each process is not independent, and unless it is set up in an organic relationship with the preceding and subsequent processes, a rational and smooth flow will not occur, and production efficiency will be reduced. There is a risk that the flexibility to respond to changes will be lost. Conventional process control methods only schedule each process as an independent entity, and there is no way to process data within a consistent flow of production control. In view of the above problems, the object of the present invention is to
We calculate the processing schedule by relating the processes of each department in FMS from a continuous perspective, and set a rational and smooth work flow to improve productivity.
An object of the present invention is to provide a process control method that is flexible to changes. In order to achieve the above object, the present invention provides a procedure for extracting processes that go through the relevant FMS department from all work schedule data, and comparing the FMS process data edited as a result of the extraction with a work data standard file. A process processing data creation procedure that indicates the presence or absence of a setup change, calculates the machining time per pallet and the number of loaded workpieces for each process, and assigns the number of loaded workpieces, the assigned number of loaded workpieces, and the presence or absence of a setup change. Based on the data, a process setting process is performed to perform a branch setting process for setting a parallel machining process for progressive workpieces, or a confluence setting process for setting an integrated machining process for sequentially feed the workpieces; If there is an overload in the machining time for each process, job data is created by a procedure of finding an alternative process with less load and setting the alternative process to the process with less load. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of an FMS line suitable for implementing the present invention. In FIG. 1, the system is roughly composed of a management department and a work department, and the management department includes a line management control section 100 and a general management control section 101. The line management control unit 100 flexibly manages the flow of each machining process during system online according to the schedule, and the general management control unit 101 located above it controls NC data as preparation information, tool management data, and machining schedule. Comprehensive understanding and management of data, setup schedule data, etc. The line management control section 100 and the general management control section 101 are connected to each other via a modem (modulation/demodulation device) between CCUs (communication control units), and transmit and receive data. In the work department, the main controller 102 sequentially processes the data sent from the line management control unit 100.
NC machine 103a, 103b, 103c, 103d
NC devices 104a, 104b, 104c, 10
Give commands to 4d. Along with the line management control unit 100, the main control device 102 and the NC device 104a,
104b, 104c, and 104d are linked to an optical data highway 105, and are adapted to take in necessary data as and when required via an NLU (Network Linkage Unit).
The main controller 102 is also connected to a ground platform 110 that controls an unmanned truck 108 and a stacker crane 109 that run on tracks 106 and 107. Further connected to the setup station 111 are an operation panel 112 that mainly controls manual setup operations, and a terminal 113 that inputs setup information and displays setup instructions. According to the process control method of the present invention, which will be described later, the worker outputs the load-calculated setup schedule data and processing schedule data by operating the terminal 113, and confirms the daily work schedule. At the setup station 111, necessary workpieces and pallets are selected from the work storage 114 and pallet storage 115, and at the mounting station 116, the workpieces are attached to the pallets using necessary jigs and tools. The pallet P, which has been prepared according to the schedule of the day, is transferred to the pallet stocker 11 on the setup side.
7 is stored. Palette storage 115 above
A variety of palettes are available. The type of pallet is determined by the number of workpieces installed and loaded and the processing method. Figure 2 shows examples of various pallets on which workpieces are mounted. The flat pallet P01 shown in Figure 2A is usually made by mounting one to four workpieces, but in a process where workpieces are processed from five directions, it is appropriate to load one workpiece, and the workpieces are processed only from one direction. Four workpieces may be attached in the process. Convex pallet P02 (Figure 2 B) holds 2 workpieces.
The prismatic pallet P03 (FIG. 2 C) is suitable for processing four workpieces by attaching them to each surface. Pallets P04 and P05 shown in Fig. 2 D and Fig. 2 E are examples of special pallets (L-shaped, triangular prism), respectively, and may be adopted depending on the processing method. Requires. Additionally, different types of pallets are available depending on the work size. Under the control of each FMS control system in Figure 1,
The pallet P prepared in the pallet stocker 117 on the setup side is temporarily held at a predetermined position in the pallet stocker 118 on the machine side by the stacker crane 109. A desired pallet P is conveyed by an unmanned cart 108 according to a command from the main controller 102, and is carried into, for example, an NC machine 103b in a process MC49.
The processed pallet P is transferred to the next process by the unmanned cart 108 or placed on the machine side pallet stocker 118. FIG. 3 is a procedure explanatory diagram showing an example of a job data creation procedure according to the present invention. In FIG. 3, job data 51 for each process is calculated from comprehensive work schedule data 50 for the entire factory.
The steps to create are FMS process data extraction procedure 1,
It consists of a process data creation procedure 2, a process setting procedure 3, an alternative process setting procedure 4, and a job data format conversion procedure 5. First, an example of the total work schedule data 50 is shown in Table 1.

[Table] In the first stage FMS process data extraction procedure 1, prepare the FMS process standard file 52 in advance,
Search using the workplace name C1 of the FMS department as a key,
Create an FMS process data file as shown in Table 2.

[Table] This FMS process data is transferred to the next process processing data creation procedure 2, and first, it is compared with the work data standards stored in the work data standard file 53 as shown in the table below. Note that the work data standard file 53 is data given to each work.

[Table] Through this verification 21, the number n of workpieces attached per pallet in each process is extracted. Next, this number n
Re-check with the above FMS process data (Table 2),
Unit machining time for each process shown in the machining time column
Using t', the processing time t per pallet for each process is calculated as t=t'×n. For example, in the No. 1 process, the processing time t' is 1.8 in Table 2, and the number n is 4 in Table 3, so it takes 7.2 hours to process one pallet. The numerical value obtained in this calculation 22 is expressed as an integer value in binary unit time of 1, 2, 4, 8, 16, etc., similar to the branching method, so that it is easy to confirm or replace the schedule time frame. is converted to The takt time conversion process is performed by comparing it with the takt time reference file 54 and assigning it to each process. The takt time reference file 54 is stored in the format shown in Table 4, for example.

【table】

Claims (1)

[Claims] 1. In an FMS process control method in which workpieces are loaded on pallets and sequentially transferred through multiple processes while changing pallet setups during the machining process, The FMS process data edited as a result of the extraction is compared with the work data standard file to indicate the presence or absence of setup changes, and the processing time and number of workpieces loaded per pallet for each process are calculated. Then, based on the process processing data creation procedure that assigns the number of workpieces to be loaded, and the assigned number of workpieces to be loaded and data on the presence or absence of setup changes, branch setting processing is performed to set a parallel machining process for progressive workpiece feeding, or an inter-process setting processing procedure for performing a confluence setting process to set a progressive integral processing process; and, if there is an overload in the processing time of each process in the FMS process data, find an alternative process with less load; 1. A process management method in FMS, characterized in that job data is created by including an alternative process setting procedure for performing a setting process for substituting the overloaded process with a process with a low load.