Technical Information

At BIRN we have the opportunity to mould in a variety and different sizes, as we have a Disamatic plant. We also offer different material qualities. Mould sizes and material grades are mentioned below:

Disamatic mould sizes:

  • 480 x 600 mm
  • 600 775 mm
  • 700 x 950 mm

Grey Iron according to EN 1561:
 Grade of Material     Material No.  
 EN-GJL-150  EN-JL 1020
 EN-GJL-200  EN-JL 1030
 EN-GJL-250  EN-JL 1040
 EN-GJL-300  EN-JL 1050
Properties: Gode damping properties 

Application examples: Gear housings, hydraulics housings, pump housings, brake discs etc.

Nodular Iron according to EN 1563: 
 Grade of Material    Material No.  
 EN-GJL-400-18-LT  EN-JS1025
 EN-GJS-400-15  EN-JS1030
 EN-GJS-450-10  EN-JS1040
 EN-GJS-500-7  EN-JS1050
 EN-GJS-600-3  EN-JS1060
 EN-GJS-700-2  EN-JS1070
Properties: Good tensile strength, dutile

Application examples: An alternative to steel and drop-forged parts, e.g. in the automotive industry

Casting tolerances

For machine casting the tolerances are as specified in ISO 8062 CT8 - CT10. For annealed goods, EN-GJL and EN-GJS are used. In the above tolerances, mismatch allowance and shrinkage allowance are included. In the case of thicknesses, of course, a greater degree of tolerance band is used than that which applies to ordinary dimensions.

Machining allowances

A machining allowance of 2 mm is usually expected for dimensions up to 120 mm and 2.5 - 3 mm for dimensions larger than 120 mm.

See ISO 8062 grade F - G for more information.

Pattern draft specification

According to the norms, no draft is included in casting tolerances. Therefore it is important to specify how the draft should be located in relation to the drawing dimensions.

For consistency, both + draft, - draft and + / - draft are used as model draft types. However, you should be aware that the draft must be adjusted to the model heights. And here it is important to note that a deep pattern can do with a small amount of draft, while a shallow pattern needs a lot of draft.