Quality
The production technology, developed by MAGYARMET, has been approved by TÜV Rheinland acc. to DGR 97/23/EC, and the extensive quality assurance system of the company is certified acc. ISO 9001.
Regarding dimensional tolerances, surface roughness and machining allowance MAGYARMET applies the P 690 guidelines released by the German Association of Casting Industry (BDG) in 2010. The guideline (BDG Reference Sheet P 690: Investment castings – Dimensional tolerances, surface condition, machining allowance) is a Europe-wide recognized standard.
Linear Tolerances
| Nominal Dimensions | D1 | D2 | D3 | |||
|---|---|---|---|---|---|---|
| Field | GTA | Field | GTA | Field | GTA | |
| 0 - 6 | 0,3 | 14 | 0,24 | 13,5 | 0,2 | 13 |
| 6 - 10 | 0,36 | 0,28 | 0,22 | |||
| 10 - 18 | 0,44 | 0,34 | 0,28 | |||
| 18 - 30 | 0,52 | 0,4 | 0,34 | |||
| 30 - 50 | 0,8 | 14,5 | 0,62 | 14 | 0,5 | 13,5 |
| 50 - 80 | 0,9 | 0,74 | 0,6 | |||
| 80 - 120 | 1,1 | 0,88 | 0,7 | |||
| 120 - 180 | 1,6 | 15 | 1,3 | 14,5 | 1 | 14 |
| 180 - 250 | 2,4 | 15,5 | 1,9 | 15 | 1,5 | 14,5 |
| 250 - 315 | 2,6 | 2,2 | 1,6 | |||
| 315 - 400 | 3,6 | 16 | 2,8 | 15,5 | ||
Data for iron-, nickel-, cobalt- and copper-based alloys.
The tolerance band to be applied is as follows:
D1 – generally applies to free dimensions
D2 – applies to functional dimensions
D3 – applies only to very precise functional dimensions to be agreed with the investment foundry
Wall Thickness Tolerances
| Smallest Side Length of an Area in mm | Materials of Group D-, Fe-, Ni-, Co-, Cu-based Alloys, Dimensions in mm |
|---|---|
| < 50 | +/-0,25 |
| 50 - 100 | +/-0,30 |
| 100 - 180 | +/-0,40 |
| 180 - 315 | +/-0,50 |
| >315 | +/-0,60 |
Surface Finish
| Surface Standards | Materials of Group D | |
|---|---|---|
| CLA (µinch) | Ra (µm) | |
| N 7 1.) | 63 | 1.6 |
| N 8 2.) | 125 | 3.2 |
| N 9 3.) | 250 | 6.3 |
1.) To be agreed with supplier, achieved by additional treatment.
2.) Surface finish of the component “as cast”. Surface finish negotiated with the supplier.
3.) Standard surface finish for investment castings.
Angular Tolerances
| Normal Size 1) | Tolerance Class | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| Allowed Directional Deviation | ||||||
| Angle-minutes | mm /100mm | Angle-minutes | mm /100mm | Angle-minutes | mm /100mm |
|
| < 30 mm | 30 2) | 0.87 | 30 2) | 0.87 | 20 2) | 0.58 |
| 30 - 100 mm | 30 2) | 0.87 | 20 2) | 0.58 | 15 2) | 0.44 |
| 100 - 200 mm | 30 2) | 0.87 | 15 2) | 0.44 | 10 2) | 0.29 |
| > 200 mm | 20 2) | 0.58 | 15 2) | 0.44 | 10 2) | 0.29 |
1) Related to the length of the shorter leg.
2) Angle may deviate in both directions.