A parts list is a structured arrangement of objects, a piece of material list is a structured arrangement of parts or building groups, which are needed for the production of another part. In English the parts list is called briefly Bill OF material or as BOM. Parts list information belongs to the most important data structures, which must reproach manufacturing companies: They serve in the long run to order (see ascertainment of need) and/or the camp take the correct materials, if a certain product is to be manufactured. In the quantity production, in the process cost calculation and other control systems parts lists are used for retrograden actual consumption determination.

Demarcation

Parts lists differ from prescriptions in as much as they refer to discrete final products, usually indicate it, which material is needed, around 1 pieces of the final product (e.g. To manufacture 1 telephone). Prescriptions refer against it usually to a certain quantity of the final product (e.g. 1 kg of cakes). Similar to a parts list a schedule describes the production run in the reference to the individual work procedures with the appropriate work times (preparation time, time per part, etc.). The two plans can be coupled by appropriate allocations. A component sequence number is assigned thereby to a certain schedule position. The reverse way from the component sequence number to the aggregate is called also use of parts.

Types

In the literature become usually the Grundtypen of the gross requirement parts list, which multi level bill of materials as well as the single-level bill of materials differentiated. The distinction predominantly refers to the concrete representation at the screen or in an expression. EDP systems usually store parts list information in form of the single-level bill of materials, since from it all other necessary types can be generated by vertical bill explosion and the care expenditure are smallest.

Regards one a concrete product structure in form of a tree structure:

          P | +------+ | 1x | 1x E1 B | +------+-----+ | 1x | 1x | 2x E1 E2 E1 

with P: Final product, B: Building group, E1 and E2 buying hurry

thus the individual representational forms present themselves as follows:

Gross requirement parts list

This lists undifferentiatedly as dissolved parts list the quantities needed for the final product directly:

 Product P number need B 1x E1 4x E2 1x 

As a result of multiplication of the necessary quantities with the quantity of the final product which can be manufactured the so-called order parts list arises.

Multi level bill of materials

This lists the hierarchical structure underneath the final product:

 Product P number need E1 1x B 1x E1 3x E2 1x 

Single-level bill of materials

Single-level bills of materials are characterised by the fact that only in each case one level of the product structure is regarded: Building groups receive own parts lists, which are used in the parts lists of the superordinate groups.

 Product P number need E1 1x B 1x

 building group B number need E1 3x E2 1x 

Arrangement parts list

The arrangement parts list gives information over the arrangement sequence. The parts are summarized on lowest use and can be disposed at the same time. A transfer of structure in arrangement parts lists is possible.

Multiple parts list

If the composition of a material can change lot size-dependently, i.e. starting from a certain lot size the quantities one change or several materials and/or new components are added, then this piece of material list is converted into a multiple parts list. Alternatives to the original parts list are thus formed. These are called also variant parts lists.

Transfer into other structures

From a component system or a multi level bill of materials a product tree or a Gozintograph (RH) can be designed. This transfer is not possible with the quantity parts list, since intermediate structures are faded out such as building groups there. The quantity parts list can be transferred however more easily into the production function.

Articles in category "Parts list"

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