dogbural
Aerospace
- Jan 25, 2009
- 74
Hi,
We have supplier to inject mould parts (cylindrical flange) with PPS40 GF and lately we received samples, measured out of tolerance.
Supplier told us that they had concern with thin wall thickness with only 0.5mm so they increased mould cavity by 0.25mm (by 0.5mm in diameter).
The mould is made of steel. You may see the attached cross section view.
The diameter was supposed to be 56.2 (+/- 0.05mm) but measured 56.5mm.
Since we do not have any room in mating part, we cannot allow additional thickness.
Q1. What is the minimum wall thickness recommended in injection moulding?
Q2. I do understand our tolerance is quite tight, but is it a common practice in injection moulding to follow DIN ISO 2768 as a general tolerance?
Q3. Any way to resolve this issue? try different material of mould, rather than steel?
Any advice would be much appreciated
We have supplier to inject mould parts (cylindrical flange) with PPS40 GF and lately we received samples, measured out of tolerance.
Supplier told us that they had concern with thin wall thickness with only 0.5mm so they increased mould cavity by 0.25mm (by 0.5mm in diameter).
The mould is made of steel. You may see the attached cross section view.
The diameter was supposed to be 56.2 (+/- 0.05mm) but measured 56.5mm.
Since we do not have any room in mating part, we cannot allow additional thickness.
Q1. What is the minimum wall thickness recommended in injection moulding?
Q2. I do understand our tolerance is quite tight, but is it a common practice in injection moulding to follow DIN ISO 2768 as a general tolerance?
Q3. Any way to resolve this issue? try different material of mould, rather than steel?
Any advice would be much appreciated