Level-by-level explosion method for material requirements planning
First Claim
1. A level-by-level explosion method for managing the processing and timing of an order of required materials, said level-by-level explosion method comprising the steps of:
- (a) inputting the order of required materials, wherein the required materials comprise parent parts and component parts;
(b) constructing a material information table and a product structure table, wherein the material information table and the product structure table relate the parent parts to the component parts;
(c) constructing a bill of material using the material information table and the product structure table;
(d) constructing a composite calendar table from a calendar day table and an operating day table;
(e) calculating a plurality of order dates using calculation conditions and the composite calendar;
(f) setting up a management table facilitating registration and extraction of order information using the bill of material and the plurality of order dates; and
(g) outputting the order information, wherein the order information includes timing of the order.
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Accused Products
Abstract
Upon starting of MRP processing, material information and product structure stored on a disk are extracted into a material information table and a product structure table, respectively, and the two tables are related with each other such that upon one level explosion in MRP, explosion to lower items can be performed only by designation of an address without retrieving component parts from a parent part. Further, a calendar day table and an operating day table are used to produce a composite calendar table. The composite calendar table is used for important date calculations. Moreover, upon registration into a key area of a management table of demand information contents at a plurality of positions of the key area are replaced with each other. And, upon extraction of the demand information from the management table, contents at a plurality of positions of the key area are replaced with each other.
Consequently, upon ordering processing, the demand information can be extracted in a sorted order from the management table in a very short time.
77 Citations
13 Claims
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1. A level-by-level explosion method for managing the processing and timing of an order of required materials, said level-by-level explosion method comprising the steps of:
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(a) inputting the order of required materials, wherein the required materials comprise parent parts and component parts; (b) constructing a material information table and a product structure table, wherein the material information table and the product structure table relate the parent parts to the component parts; (c) constructing a bill of material using the material information table and the product structure table; (d) constructing a composite calendar table from a calendar day table and an operating day table; (e) calculating a plurality of order dates using calculation conditions and the composite calendar; (f) setting up a management table facilitating registration and extraction of order information using the bill of material and the plurality of order dates; and (g) outputting the order information, wherein the order information includes timing of the order. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A level-by-level explosion method for material requirements planning for performing, upon material requirements planning, ordering processing to determine required timings, required quantities of required materials by extracting, from a management table, in which pieces of demand information produced for individual items of parts constituting final goods are registered in advance, necessary demand information in accordance with order information, the level-by-level explosion method comprising the steps of:
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a first step of constructing a bill of material including material information including part numbers of individual parts at individual product structure levels constituting an object product as well as part names, units of measure, quantities on hand and product structure information representing product structure relationships among the parts; a second step of, first, producing a composite calendar table for performing calendar planning which includes calendar dates and operating dates for a production shop, table positions which are common summed up days corresponding to the calendar dates and the operating dates, operating day addresses corresponding to the respective calendar dates and also indicating the table positions of the operating dates which are equal to the calendar dates, respectively, and calendar day addresses corresponding to the respective operating dates and also indicating the table positions of the calendar dates which are equal to the operating dates, and next, obtaining, using the composite calendar table, required dates for the individual parts of the material information; and a third step of, first, setting up the management table of a predetermined form and registering pieces of demand information produced for individual items of parts in the first and second steps into the management table in a predetermined order and, next, extracting necessary demand information in accordance with order information from the management table for outputting planned and released order information and demand information. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification