DIN 16742: Plastic Moulded part tolerances for position tolerances
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Plastic Moulded part tolerances for position tolerances
According to DIN16742-2013A
GENERAL INFORMATION
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The following logical processing sequence shall be complied with for the cooperation relations between moulded part development, moulded part production and tool making:
a) The moulded part designer decides on the functionally required tolerances resulting from the application conditions and the assembly with consideration of the moulded part requirements.
b) The moulded part manufacturer confirms, for compliance with the relation "functionally required tolerance ≥ tolerance possible by manufacturing technology", the tolerances possible with the manufacturing technology for the acceptance conditions of the moulded part production, whereby economic agreements (e. g. price surcharges) may have to be incorporated. The functionally required tolerances shall always be defined in the design documentation. In this way, absurdly accurate and uneconomical "fear and habitual tolerances" are avoided.
c) The material of the moulded part is bindingly defined by the moulded part designer upon order placement. He therefore establishes the basis for determining the moulding shrinkage. After order placement, calculated values in respect to the moulding shrinkage shall be agreed between the moulded part manufacturer and toolmaker or tool designer, whereby external experience (e. g. moulded part compound manufacturer) may have to be utilised.
Depending on the moulded part compound specification, moulded part design and tool layout, the processing of the plastics has a significant effect on the dimensional stability of the moulded parts. The processing machines of the primary shaping method are complex thermodynamic-rheological compound systems, which are still processed and optimised empirically despite highly developed manufacturing technology.
Dimensionally-relevant properties of the plastics include the extreme range of the type-dependent stiffness or hardness as well as the moulding shrinkage. Unsteady and inhomogeneous tool and moulding temperatures in conjunction with orientations of microstructures and additional tolerances due to flow systems lead to property anisotropies, which cause a greater or lesser deformation (warpage, distortion, contortion) of the moulded parts. Furthermore, wall thickness differences or mass concentrations / material concentrations can be possible causes for deformation. Form, location and angle deviations are therefore connected in highly complex ways, which make standardisation much more difficult in comparison to metals.
The deviations from the nominal dimensions and the subsequent processing of our parts are generally dependent on the manufacturing or production processes used. DIN ISO 16742 applies for injection moulding, and the tolerance group TG 6 applies for our thermoplastics. DIN 12020-2 applies for the production of aluminium profiles. If the parts are mechanically processed, DIN ISO 2768m always applies.
MACHINING, SILK-SCREEN / TAMPO PRINTING, SAWING, EMBOSSING, CUTTING, DIGITAL PRINTING
All dimensions < 30 mm to the reference edge of the case with a tolerance of ± 0.3 mm. All other dimensions: unless otherwise specified against DIN ISO 2768m T1. At the same time, the tolerances of the basic parts must be taken into account.
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