Bányászati és Kohászati Lapok - Öntöde, 1969. (20. évfolyam, 1-12. szám)

1969-01-01 / 1. szám

С О N Т Е Л T S Csontos, I.: The origin of cracks by pouring chilled iron rolls...........................................................................P 1 Cracking is one of the particular faults of chilled iron rolls which can be attributed to pouring stres­ses, which may be longitudinal or transversal. The rise of longitudinal cracks is influenced by many factors, of which the most importants are the thermophysical relation of the mould and the casting, further as the pouring speed and the chemi­cal composition. The transversal cracks originate above all from the of moulding technology and fau’ts in producing the charge. With adequate technological measures the occurrence of cracks, can be considerably reduced. T raj kavics, J. The properly problems of foundry patterns.............................................................................P 17 The question of proprietorship of foundry' pat­terns, resp. the solving of that engages in our country since a longer time the competent organi­zations, the foundry and consumer experts. The repairing- and storage costs of the patterns are close connected with the ownership question. The author examines together this three domains of subject and intends to initiate with his paper a discussion. Krall, H. A.: Recent results got with the eonti­­nuouspouring method produced grey iron castings P 20 The development of continuous casting machines is not only determined by the patent-, but rather byr the realizable extraordinary expenses of ”know-how”-s. The author deals therefore with the historical development and the producing technology, because the users of semi-finished grey-iron products and profiles can see from the producing method, that by this, castings for the machine industry can be produced, with outstan­ding qualities, which posess extremely various and new possibilities.

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