JPH06101005B2 - Machining process plan creation device for individual production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a manufacturing process plan creating apparatus for manufacturing individually manufactured products, that is, products of different types for each product, including some common processing processes, The present invention relates to a machining process plan creation device that determines a work order in each process based on process information.

[Conventional technology]

Traditionally, several methods have been proposed for planning work. Among them, in individual production, a method called PERT as shown in Fig. 5 is one of the methods often used. For example, from Kodansha Co., Ltd.
It is shown in Blue Bucks B-35, "The Science of Planning," published on the 18th of March.

In the figure, 21 is a sheet of paper, 22 is an arrow written on the sheet of paper 21, 23 is a circle shown at both ends of the arrow 22, and a circle 23 and an arrow
I expressed the whole work plan with 22 combinations and wrote it on the paper 21.

Next, a method of creating the conventional plan shown in FIG. 5 will be described. First, when planning a job, the contents of the job are analyzed in a time series, and a, a
The work unit is disassembled as b, ... j, the work unit is represented by an arrow 22, and the connecting point of the work unit and the work unit is represented by a circle 23, and the disassembled work units are associated with each other to represent the overall work plan.

[Problems to be solved by the invention]

According to Blueback's "Science of Planning", the conventional planning method using PERT shown in Fig. 5 was originally created for the missile development plan, and is used for the construction of dams and buildings. Being able to exert its power. PE like this
RT is a very effective method for achieving a single major goal, but in an individually-manufactured manufacturing factory where the production of multiple products of one product is undertaken at different times and must be completed at different times. There was a problem that the conditions were different. In other words, each process is composed of limited resources such as machines, people, and time, so the manufacturing of one product always affects the manufacturing of other products. There was a problem that the process plan of the product was very difficult to make.

Furthermore, when representing projects such as building construction and new product development with this network as in the past, for example, P. of "Electronic Computer Handbook" issued on May 25, 1966 by Ohmsha Co., Ltd. As described in 6-49 to 6-55, the required time for each process is usually expressed in units of days, so the earliest time and maximum time calculated based on the required time (number of days required) The late time is also usually represented by the number of days or years, but when processing one die in a processing and assembly plant such as a die is regarded as one project, and this project is represented by a network. Unlike the conventional method, the time required for each process is usually 1 hour 30
Minutes, etc. are expressed in units of hours and minutes.
If the earliest and latest times are calculated using only this required time, the earliest and latest times will also be expressed in hours and minutes or year / month / day / hour / minute. However, there is a problem that the actual situation cannot be fully expressed because the result is that a plurality of processes are processed one after another.

Therefore, at the time of production, even if a production engineer engaged in production prefers to produce a product with few spare days, in a processing and assembly plant where the time required for one process is short, such as 1 hour and 30 minutes, There is a problem in that methods such as PERT cannot be applied as they are and the calculation of the number of spare days cannot be performed correctly, so that it is not possible to prioritize the parts of the product with a small number of spare days.

In addition, even if you try to judge the margin only by the number of days until the delivery date, you cannot always express the margin due to the large number of post-processes, the small number of post-processes, the time required for the post-process, etc. There was a point.

Moreover, in the conventional PERT, the time required for a process is the time from the start of one process to the transition to the next process,
Since it includes the stay time, for example, in the case of the next process next day delivery that is often seen in normal processing and assembly plants, the time required for direct work such as processing is the time required for a certain process. Although it can be predicted almost accurately from the content and can be expressed as hours and minutes, the unavoidable waiting time is determined by the time of processing on a certain day, so there is a problem that it cannot be expressed in advance as hours and minutes. It was

Further, the conventional PERT also has a problem that it cannot be expressed well even when a plurality of processes have to be processed on the same day as the next, as is often seen in a normal processing and assembling factory.

In addition, the component configuration, processing procedure, processing time, etc. of each product are expressed in a conventional planning explanatory diagram called a RERT diagram unique to the product as shown in FIG. When each manufacturing start date and manufacturing completion instruction date are given to the PERT diagram corresponding to each product, the conventional PERT method picks up one PERT diagram, that is, one product, and It is possible to plan and process only the PERT diagram of, and some products have a schedule plan for a system in which parts are processed while mutually affecting each other under limited shared resources. There was also the problem that it could not be processed.

The present invention has been made to solve such a problem, and when each part of a plurality of products of one product is manufactured by going through each process constituted by finite resources, they have an influence on each other. In consideration of the above, and even if the processing time (required time) in one process is as short as 1 hour and 30 minutes, etc., it can be processed according to the actual situation, and all products will be manufactured by each manufacturing completion instruction date. It is an object of the present invention to provide a machining process plan creation device aiming at completion.

The present invention is also a factory that shares limited resources such as machines, people, and time, and is given a PERT diagram for each of a plurality of products, and a manufacturing start date and a manufacturing completion instruction date that are independent of each other. When it is going to be processed using the shared finite resources, the parts that can be started and rushed for each process, that is, the parts that have the least number of days until the latest start date calculated by the PERT diagram of each product alone are processed. It is an object of the present invention to provide a processing process plan creation device aiming at completion of manufacturing of all products by each manufacturing completion instruction date by making such a process plan.

[Means for Solving the Problems]

The machining process plan creation apparatus in the individual production according to the present invention inputs the component structure of a product of a certain type, the machining process information of each component, that is, the machining process order, the machining time for each process, the number of stay days, and the network information. A first means, a second means for inputting a manufacturing start instruction date and a manufacturing completion instruction date for a product of the variety, and a third means for inputting a planned operation date of the factory and an operation time of each expected operation date. , The information input by the first means or the third means,
The fourth means for calculating the earliest start date and the latest start date of all the processes of all the parts of the product when making only that product, and which process of which part of which product of which product is being manufactured every day 5th means to enter which process has been completed and all the products being manufactured at the factory.
Of the machining process information, a sixth means for extracting the machining process information that can be processed at present and the machining process information extracted by the sixth means are processed by the third means for each process. When allocating the obtained factory operation date, the above 4th
The seventh means for calculating a machining process plan to be allocated within the operating time of the day obtained by the above-mentioned third means from the parts having a small number of days of factory operation until the latest start date obtained by Eighth means for examining a post-process of the allocated machining process information, determining whether or not the process can be started in consideration of the network information, and calculating a time at which the process can be started.
By advancing the planned time axis, the sixth means to the eighth means
And a ninth means for repeating the above-mentioned means.

[Action]

In the present invention, among the respective processes of the parts of the plurality of products, the parts which can be started for each process are selected, and the machining process plan is established so that the process having the few spare days can be started quickly.

In addition, since the earliest and latest days are calculated based on the newly set number of stays instead of the required time, for example, when the same work of a certain process is passed to the next process on the next day, the number of stays (the number of stays) If 1 day is set and the next process is delivered on the same day, the actual situation can be expressed as it is by setting the number of stay days (residence days) to 0 days, and the earliest and latest days can be calculated according to the actual situation. It has become possible.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a conceptual diagram showing the structure of the factory.
2a, 2b, ... 2j are each process that constitutes the machining site 1, 3 is a process plan management department adjacent to the machining site 1, and in FIG. , 02 and 0
An arrow 4 shows how 3 is processed through each process. In addition to these, many parts of other products not shown in the figure extend through each process.

FIG. 1 is a processing flow for making a machining process plan in order to control the machining flow at the machining site 1 by the process plan management department 3, and the earliest start date for each process of each part for each product. , The latest start date is calculated, the results are input for products that have already started manufacturing, and a processing process plan for all unfinished products is shown. The intermediate information and the machining process plan information are stored in the storage device 11.

FIG. 3 is a block diagram showing an example of an information processing device 10 which is a main part of the process plan management department 3, in which the information input through the input / output device 13 is processed by the central processing unit 12 and then stored. Stored in device 11. Further, based on the information stored in the storage device 11, the machining process plan information for the entire factory calculated by the central processing unit 12 is stored in the storage device 11 and is output from the output device 14 as necessary. To be done.

FIG. 4 is a table showing processing step information of each part regarding the product A illustrated in FIG. 2, and these are shown in FIG.
It is input to the storage device 11 via 13.

Next, with reference to FIG. 1, a procedure for making a machining process plan for the entire factory will be described.

As an example, for some products, the manufacturing instructions for the product A newly shown in FIGS. 2 and 4 have already been started or completed for some steps of respective parts. When a process plan for the entire factory is to be created, for the product A that must be newly started, the parts configuration of the product A and the process step information shown in FIG. 4, that is, process order, process time, stay The number of days, FROM and TO, which are network information, are input (step S1), and the manufacturing start instruction date and the production completion instruction date of the product A are input (step S2).

Then, when the factory operation plan is decided in advance (step S3), along with information such as the planned factory operation date and operation time stored in the storage device 11, the earliest start date and maximum operation date for each process are set. Calculate the late start date (step
S4).

For products that have already started, the same calculation is performed before starting, and the actual results such as process start and process completion are input (step S5), and this information is also stored and held in the storage device 11. .

After gathering such information, a process plan for the entire factory will be established. As a method, for example, in the case of making a plan from tomorrow, after entering all the results such as process start up to today and process completion, set the date on the plan tomorrow (step S6), regarding one process, Select all the parts that can be started on that day (step S7). Then, the parts having a small number of spare days are allocated as the work of the process within the operating hours of the day (step S8). This is performed for all steps.

Next, assuming that all of the allocated work will be completed as planned, regarding the allocation, the process immediately after will be examined, and if the conditions are met, it will be possible to start the process immediately after the number of stay days (step S9) Then, the date on the plan is advanced by one day (step S10), and the same work is repeated if it is not completed for the entire period (steps S7 to S10), but if it is completed, it is ended.

In this way, processing process plans are completed for all products including the product already started and the product A to be newly started, and the result is, for example, output device.
Output by 14 and shown at each step.

Here, the case where the number of stay days of a certain part in a certain process is given as a part of the machining process information in the form as shown in FIG. 4 is described. However, from the machining time given as a part of the machining process information, The stay days may be calculated by a fixed calculation formula. In Example 1 of FIG. 4 (A), FROM and TO are given to all elemental works as network information, but if the network configuration can be uniquely shown, Example 2 of FIG. 4 (B) You can use other methods such as.

〔The invention's effect〕

As described above, according to the present invention, when each part of a plurality of products of one product is manufactured by going through each process, the earliest day, the latest day (even the date and time) is calculated by using the stay days instead of the required time. ) Is calculated, and the number of spare days is calculated using this, and the machining process plan is created by allocating in order of working days based on the number of spare days and operating time in each process. In consideration of the above, and theoretically, not just the can, the production of all products was completed by the respective instructed completion dates, in consideration of prioritizing the processing of parts of products with few spare days. Make a process plan,
By showing it to the manufacturing site, there is an effect that smooth manufacturing can be performed and that the process can be secured.

[Brief description of drawings]

FIG. 1 is a processing flow chart showing an embodiment of the present invention, and FIG.
The figure is a conceptual diagram showing the configuration of the factory, FIG. 3 is a block diagram showing an example of the information processing apparatus, and FIGS. 4 (A) and 4 (B) are products A.
FIG. 5 is a diagram showing a table of machining process information of each part regarding FIG. 5, and FIG. 5 is an explanatory diagram of conventional planning regarding the product A. 1 …… Processing site, 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j ……
Process, 3 ... Process plan management department, 4 ... Arrow, 10 ... Information processing device, 11 ... Storage device, 12 ... Central processing unit, 13
...... Input / output device, 14 …… Output device. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A machining process plan creating apparatus for manufacturing a product of a different product type for each product, including a part of a common processing process, and a part configuration of a product of a certain product type, and processing process information of each part. That is, the first means for inputting the order of processing steps, the processing time for each step, the number of stay days, and network information, the second means for inputting the manufacturing start instruction date and the manufacturing completion instruction date of the product of the product type, and the factory All the products in the case where only the product is made by the third means for inputting the scheduled operation date and the operating time of each scheduled operation date and the information input by the first means to the third means. Fourth means for calculating the earliest start date and the latest start date of all the processes of parts, and which process of each product, which part of which product has been started, and which process has been completed every day Enter
Means, a sixth means for extracting processing step information, which can be processed on the day of work, from the processing step information for all products being manufactured in the factory, and the sixth means. When allocating the machining process information for each process to the factory operation scheduled date obtained by the third means, the parts having a small number of factory operation days up to the latest start date obtained by the fourth means, that is, a part having a small number of spare days From the above, the seventh means for calculating the machining process plan to be allocated within the operating time of the day obtained by the above-mentioned third means and the post-process of the allocated machining process information can be examined, and the network information can be taken into consideration to start the operation. Eighth means for judging whether or not it is possible to start a time, and advancing a planned date, and repeating the sixth means to the eighth means for the number of days of the machining process plan preparation period. 9 means, For example, processing steps planning apparatus in the individual production, characterized in that all products in the production in the whole plant to create a machining process plan aimed at the production completed by the respective manufacturing complete indication date.