JPS62173155A - Input control optimization system - Google Patents

Abstract

PURPOSE:To improve the efficiency of automation, by setting the effective counterbalancing of stock parts and the input order of an optimum lot to reduce nonoperating time of each machine speedily and automatically, in case of an automated manufacturing shop performing multikind-mixed production. CONSTITUTION:A controller 8 stores production information on service parts, working machines, operating time, etc., and result information on stock parts, input actual results, buffer quantity, etc., in advance, and on the basis of the production plan given by a host controller 9, calculates the optimum parts counterbalancing of a lot and the input order, and this result is displayed as an operating indication to an output device 7, while registers it to the host controller 9. A necessary lot is delivered out of a parts group housed in a parts storeroom 1 on the basis of this operating indication and, after these lots are disposed according to the optimum input order set at the controller 8 by a disposal device 2, they are conveyed to each machine 4 performing their processing by a conveying line 3.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for optimizing input control in an automated manufacturing shop that performs mixed production of a wide variety of products, and in particular, to increase production efficiency by adjusting the input order of parts reservation, nine parts input order, etc. The present invention relates to an input control optimization method suitable for determining.

[Background of the invention]

The conventional production request loft input method is 1, for example, JP-A-53
-148681 publication or IE1980.6 20
As described in "Production information management that traces the plan with high precision using MPR as the core" (Takahiro Miyata), it is a system that allocates parts and determines the order of input according to priorities such as delivery date, cost, and loft work volume. It is.

Although this conventional method is simple, it does not take into account the checking of all inventory parts or the variations in work time for each input lot, so after the lofts are input into the manufacturing shop, line stoppages due to missing items, and between lofts. There is a problem that machine downtime due to work interference (idle time waiting for work, blocking time when the machine stops because the next machine is working, etc.) is likely to occur, resulting in a low machine utilization rate.

[Purpose of the invention]

The purpose of the present invention is to eliminate the problems of the prior art described above,
The purpose of this invention is to provide an optimization method for parts allocation and input control that determines the order of parts allocation and input order to increase the machine operating rate, targeting automated manufacturing shops that perform mixed production of a wide variety of products.

[Summary of the invention]

In the present invention, in a production line where a plurality of machines are installed, a controller is provided to calculate the loft (manufacturing unit of parts or materials) to be processed by each machine and give work instructions, and input information from the controller is provided. Accordingly, an electronic computer that stores production information such as inventory parts, used parts, working hours, etc. is used to quickly and automatically calculate the optimum parts handling and input order on the production line, and send the results to the controller. It is output as a work instruction and each machine is controlled according to this work instruction.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of an example of a manufacturing workplace to which an embodiment of the present invention is applied. The manufacturing workplace line in FIG. 1 includes a parts (or material) warehouse 1, a serving device 2 that arranges the lofts in an optimal loading order, and a transport line S that transports each lot.
It consists of machines 4 that process each loft, buffer spaces 5 between the machines 4, and a finished product warehouse 6 that stores finished products that have been processed.

And the parts warehouse 1, the catering device 2, and each machine 4.

Each controller 8 is managed and controlled by a host controller 9. In addition, without using each of these controllers 8, the host
It goes without saying that centralized control by only the controller 9 may be used. 7 is an input/output device.

Next, the operation of an embodiment of the present invention when implemented in the above-mentioned manufacturing workplace will be specifically described.

The controller 8 stores in advance production information such as parts used, machines used, and working hours, as well as performance information such as parts in stock, input results, and back quantity.
Based on the production plan given by , the optimum parts allocation and input order for the loft to be processed within a certain period of time are calculated according to the procedure shown in Fig. 2 described later, and the results are displayed as work instructions on the output device 7. At the same time, it is registered in the host controller 9. Based on this work instruction, the necessary lofts are taken out from the parts stored in the parts warehouse 1 (automated warehouse 1, etc.), and after being served by the catering device 2 in accordance with the optimal loading order determined by the controller 8, they are placed on the transport line. 3
and transported to each machine 4 for processing. The lofts that have been processed by each machine 4 are stored in the finished product warehouse 6, and their performance information is registered in each controller 8 and host controller 9. In addition, if it becomes necessary to change the input order due to changes in production plans, urgent items, shortages, or breakdowns in each machine 4, parts reservation can be made again by inputting calculation instructions from the input device 7. , calculates the loading order, and repeats similar processes such as shipping, serving, and transportation based on the results. Although FIG. 1 illustrates a flow shop line in which the machines 4 are lined up in series, the present invention
Needless to say, the present invention can also be applied to a parallel line in which the machines 4 are lined up in parallel, a job shop line, or a case where the transport line 3 is not used (for example, one-man manual transport, unmanned transport, etc.).

Next, with reference to FIG. 2, the overall processing configuration for determining the optimal loading order will be explained.

First, in the parts allocation plan, the inventory parts required for the production request loft are checked, and the loft with the maximum amount of work (time) is selected from among the lofts that can be produced with the currently stocked parts. An example of this lot selection procedure will be explained with reference to FIG. First, after setting an initial value (step 201), the shortest vector from all required parts vectors of the requested production lot to the parts inventory area is established as a required quantity vector (step 202). Then, in step 203, the degree of decrease in the required parts vector when lot j is removed by 9 from the set of selected lots is expressed by the orthogonal projection hj, and the value obtained by orthogonally projecting the work amount (time) C and dividing by is effective. Calculate the slope.

Next, proceeding to step 204, the minimum effective slope loft is removed from the set of selected lots, and a new total required parts vector is set by subtracting the required parts vector of the lot from all required parts vectors. This step 202,
The processes in steps 203 and 204 are repeatedly executed, and when the size of all required parts vectors becomes equal to or less than the size of the parts inventory vector, the process proceeds to step 205, where the required lots are determined that can be added from among the lots excluded in step 204. The parts vector is added, a new all-required parts vector is set, and the lot is added to the set of selected lots.

In this way, the lot registered in the set of selected lofts becomes the lot to which parts are allocated by this means.

Once the lot selection is complete, proceed to the capacity planning shown in Figure 2. In this capacity planning, loads are distributed among the selected lofts according to the working capacity of the manufacturing workplace, and input lots are determined for each unit period, for example, each day.

In the final work plan, the input order of the determined input lots is determined according to the procedure shown in FIG. 4 so that the idle time and blocking time of each machine 4 are minimized.

In Fig. 4, first, the production line is divided into two parts before and after the machine with the maximum amount of work (time) (step 301), and the production line is made into two pseudo machines, and the initial solution for determining the input order with the minimum idle time is as follows. Determined by judgment formula (Step 3
02).

顛（P□、＋ 、p、、 、２）
+ l ''i, 2) When the above formula holds true, lot i is made to precede lot i+1. However, P, , is the working time of lot 1 in machine j.

Then, in order to improve the feeding order obtained from the initial solution in a short time, the process is partially divided (step 606), and a feeding order that minimizes the idle time and blocking time for each machine is determined (step 304).

〔Effect of the invention〕

As explained above, according to the present invention, in a multi-product mixed production line where the working time for each lot is different, parts reservation that effectively utilizes inventory parts and optimum lot optimization that reduces downtime of each machine are possible. The order of feeding can be determined quickly and automatically without the need for human intervention, which improves the operating rate of each machine and further enhances the effectiveness of automation.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of an example of a manufacturing workplace to which the input control optimization method according to an embodiment of the present invention is applied, Figure 2 is a system configuration diagram according to an embodiment of the present invention, and Figure 3 is a lot selection diagram. Flowchart showing the processing procedure. FIG. 4 is a flowchart showing the processing procedure for determining the order of loft addition. 2... Serving device 4... Machine 7... Input/output device 8.9... Controller.

Claims (1)

[Claims] In a production line equipped with multiple machines that process lots, an electronic system that stores production information such as inventory parts, used parts, machines used, working hours, etc. in advance according to input information from a controller that controls the machines. A computer calculates optimum lot allocation and loading order for each of the machines, outputs work instructions based on the calculation results to the controller, and controls the conveyance and loading of lots to each of the machines. input control optimization method.