Reported by
T.H. Hall, M.C.S. (Leader)
Dr. R. Potvin, Canada
J.M. Berry, M.O.S.
A. Eydon, M.O.S.
A Graham, M.O.S.
F. Howitt, M.O.S.
Dr. O.R.J. Lee, M.O.S.
A.J. Murphy, M.O.S.
J.F. Paige, M.O.S.
K.S. Rawlins, M.O.S.
B.I.O.S. Trip No. 951 August, 1945
C.I.O.S. Black List Item No. 21.
Metallurgy
For practical reasons, this document have been copied partially. Some page being skipped due to an apparent electrostatic failure in a copier
We focus onto the two main German die casting companies Mahle and Aluminiumwerke Nürnberg G.m.b.H. (also known as: Nüral, AOB)
Keywords: Mahle Stuttgart / Bad Canstatt
Mahle K.G. Stuttgart Fellbach The factory of the Mahle group had specialised in pressure die castings and was the most important of its kind in Germany. The magnesium alloys, aluminium alloys and zinc alloys were cast and the range of products was very wide.
A relatively small shadow plant known as F. Eichert was located at Eislingen . It was equipped with ...
Personnel:
Management
Ernst Mahle - Owner
Dr. A. Bauer - Chief Engineer Bauer's political activities had led to his exclusion from the work and the only person available for interrogation was Dr. Mayer
Gustav Lieby - Manager
Dr. Mayer - Deputy Manager
Workers employed 1939 - 1944 - 1945 ...
All the vertical hot-chamber machines designed by Mahle were built by Müller, Eislingen.
The factory was quite free from air-raid damage
Alloys used: Magnesium Alloys - Aluminium Alloys - Zinc Alloys
Die casting practice ... Vertical Hot-Chamber Machines ... All magnesium alloy castings were made on the hot chamber machines and it is worth noting that this is in direct contrast to the practice at V.D.M. Heddenheim where could-chamber machines of the Polak type were used ..
... The closing pressure of the die itself was about 80,000 Kg (80 tons)
The Polak Type Cold Chamber Machines were used primarily for aluminium or zinc and the Polak-type machines were considered to be the best cold chamber available ...
Production rates
Production costs .. Melting costs ...
The cost of ingot metal was stated as follows:
Magnesium alloys 1450 R.M. per ton
Aluminium alloys 1400 R.M. per ton
Zinc alloys 600 R.M. per ton
Melting practice
Metal Recovery
Tail wheel castings ...
Sample from a V2 rocket casting
Aluminiumwerke Nürnberg (Nural, Nüral)
This is one of the largest and best known light alloy foundry plants in germany. The 1939 production was 2,800 tons rising to 6,500 tons in 1944. The firm specialised in die casting and cast 40% of pistons in Germany allso taking the major part in die casting air cooled cylinder heads for aircraft engines (BMW 801)
Personnel Executives available at plant:
Wilhelm Däubel Commercial-Manager
Hans Smohling (Schmöhling? AOB) Prokurist? AOB engineer - -chief
Rudolf Schitt Prokurist? Diplom-ing.
Willi Merz Prokurist?
Dr. Max Kuhm (Kuhn, Kühn? AOB)
Alloys used: Lo-Ex - "Y" Alloy and 10% Cu - Hydroalium - Silumin beta and gamma - Secondary alloy - Zinc alloy -
Elektron A.8 Magnesium alloy containing 8% Al for pressure die castings mainly radio chassis. This alloy was used for thin walled parts (2 mm thick) because of its fluidity
"Lo-Ex"practice
Silumin Practice The alloy ingot was supplied by Silumin Gesellschaft, Frankfurt and by Lautewerke Saxony.
Degassing ...
Hydronalium Practice ...
Magnesium Foundry Melting Practice Production was 5-10 tons per month of pressure die-castings in the alloy "A.8". The metal was melted in Schmitz and Appelt gas-fired furnaces of 200 kgs capacity in two to three hours. ...
Heat Treatement
Moulding Sand ...
Pressure Die Casting ..... Gmöhling machines was made by Werner and Pfeiderer of Stuttgart (Bad-Cannstatt)
Re-Melt Department
pistons were all coated with lead ...
The Perner Process for lead coating aluminium pistons ...
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