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An assembly (called a group for short according to DIN 199 ) is a self-contained object consisting of two or more parts or assemblies of a lower order, which can usually be dismantled again. An individual part, on the other hand, is a technically described and manufactured object that cannot be disassembled without being destroyed (see DIN 199 Technical Product Documentation ).

An assembly can consist of subassemblies and parts and can be created through assembly processes. In operational practice, an assembly is often referred to as assembly designated; In addition, other names such as assembly group, welding group or cable harness are used in certain production areas instead of the term assembly. The constructive relationship between parts and assemblies is shown in a drawing and the manufacturing relationship is shown in a parts list .

In BOMs assemblies are often from single-level bill displayed that are needed not only for construction but also for the production, procurement, logistics and spare parts service. The construction describes assemblies mainly according to functions and geometry with the specification of the physical, electrical and possibly other relevant properties. The number and description of assemblies can differ from one another due to the different tasks in the individual areas of the company - such as costing , spare parts organization , production and procurement (see material requirements assessment).

If the assemblies are first produced from the raw materials in a multi-stage production process and then the end product is produced from them in a further work step, this is referred to as pre-assembly or final assembly .

Assemblies (plant and machine construction)

An assembly is a component of a plant or a system without which the entire system will not function at all or only to a limited extent. In systems and mechanical engineering, an assembly is seen as a part of the overall system. Assemblies as such can be individual cylinders or complex mechanical and electrical attachments. Assemblies in systems and mechanical engineering have the following advantages:

  • The system remains clear, as you can concentrate on a single assembly in the design and planning
  • In the event of an error, it is sufficient to replace a module. It is rarely necessary to intervene in the overall system
  • Assemblies with small individual functions are easier to implement than a large overall system

Assemblies (Pressure Equipment Directive)

An assembly (engl. Assembly ) according to the Pressure Equipment Directive 97/23 / EC consists of multiple printing devices , which are assembled by a manufacturer to form a coherent functional unit [Definition Art. 1 (2.1.5)].

The assembly must contain the necessary equipment with a safety function (e.g. a safety valve ) and it must be brought into circulation by a responsible manufacturer. The scope of an assembly is not limited in size and can, for. B. include an entire power plant.

Electronic assembly

An electronic assembly is a constructive and, as a rule, also a functional unit made up of integrated and / or discrete and passive components that are electrically and mechanically connected by a line network on a wiring carrier. Within an electronic device , the assembly forms the next higher hierarchical level after the electronic components.

The development of electronic assemblies is characterized by market demands for reduced weight and volume, higher system performance with shorter signal propagation times and high reliability at minimal costs. Furthermore, thermal, mechanical and electromagnetic requirements as well as recycling and environmental compatibility must be observed.

An electronic flat module is an assembly consisting of electronic components connected by a rigid organic substrate.

See also

Individual evidence

  1. Wolfgang Scheel (Ed.): Assembly technology of electronics - assembly . 2nd Edition. Verlag Technik, Berlin 1999, ISBN 3-341-01234-6 , p. 9.
  2. Wolfgang Scheel (Ed.): Assembly technology of electronics - assembly . 2nd Edition. Verlag Technik, Berlin 1999, ISBN 3-341-01234-6 , pp. 9-10.
  3. J. Lienig, H. Brümmer: Electronic device technology - Basics for the development of electronic assemblies and devices . Springer Vieweg, 2014, ISBN 978-3-642-40961-5 , pp. 1-3.
  4. Wolfgang Scheel (Ed.): Assembly technology of electronics - assembly . 2nd Edition. Verlag Technik, Berlin 1999, ISBN 3-341-01234-6 , p. 10.