FOUNDRY TECHNOLOGY - Zollern

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Junctions Junctions should be configured so that no sharp internal edges or accumulations of material occur. For this reason, sloping and parallel walls should be joined to each other wherever possible at right angels. Unfavourable Better Favourable Mould and draught Mould and draught angles are only required in exceptional cases. Only where extremely long inside contours or similar exist it is necessary to provide for a slight conicity or angle. Without mould angle With mould angle Gates Where possible, a suitable even outer surface at the thickest cross-section should be selected for the gates. This constellation will permit them to be separated off more economically later. The gating surfaces can serve as gauge or reference points for subsequent machining. Possible Favourable Gate Gate ≤ 1° INVESTMENT CASTING
Holes and slots Mould and draught angles are only required in exceptional cases. Only where extremely long inside contours or similar exist it is necessary to provide for a slight conicity or angle. Holes and channels Slots and groves dia. / or similar Greatest length or depth Width Greatest depth, bottom Through hole Blind hole open closed d (mm) l t b (mm) l t ≥ 2 up to 4 ≈ 1 x d ≈ 0.6 x d ≥ 2 up to 4 ≈ 1 x b > 4 up to 6 ≈ 2 x d ≈ 1.0 x d > 4 up to 6 ≈ 2 x b ≈ 1.0 x b > 6 up to 10 ≈ 3 x d ≈ 1.6 x d > 6 up to 10 ≈ 3 x b ≈ 1.6 x b > 10 ≈ 4 x d ≈ 2.0 x d > 10 ≈ 4 x b ≈ 2.0 x b 18 19 Through holes It is advisable to configure through holes and slots in such a way that they can be formed with an unsplit core slide. Slots Slots can only be produced without ceramic cores if the ratio b:t or b:l as indicated in the diagram on the right can be adhered to; The dimension S can be selected as required. Possible Core puller Favourable b b R t t d (b) R d R l d d d d (b) (b) (b) (b) (b) Naturally smaller casting radius s s>b possible s Blind holes Blind holes and closed slots must be rounded off at the bottom. In the case of Al and Ti alloys, it is advisable to avoid blind holes. Examples of design measures The exemplars on the right demonstrate how it is often simple to achieve the economically most favorable table values through intelligent design. To be avoided Favourable Unfavourable Favourable d d d d (b) (b) (b) (b) t R R R R Ø Ø
Page 1 and 2: FOUNDRY TECHNOLOGY INVESTMENT CASTI
Page 3 and 4: ZOLLERN CASTINGS TECHNOLOGY - PERFO
Page 5 and 6: 1 Patternmaking 2 Assembly of the c
Page 7 and 8: 6 7 Table 2: Machining allowances d
Page 9 and 10: VDG SPECIFICATION P 690 8 9 DIMENSI
Page 11 and 12: 4. Dimensional tolerances 4.1 Linea
Page 13 and 14: 5. Surface properties For cast surf
Page 15 and 16: Ceramic cores Ceramic cores are use
Page 17: Inside edges, notches Sharp inside
Page 21 and 22: Investment casting are frequently r
Page 23 and 24: Economy It makes economic sense to
Page 25 and 26: 10 10 Aluminum electronic housing f
Page 27 and 28: CONTACT 26 27 ZOLLERN GmbH & Co. KG

FOUNDRY TECHNOLOGY - Zollern

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