Roughness of surface of vacuum castings prepared in plaster moulds

• Autorzy: Pawlak M.
• Języki publikacji: EN

Abstrakty

EN

The results of researches on surface roughness of CuSn10 and CuSn5Zn5Pb5 bronzes and aluminum AlSi11 alloy vacuum castings prepared in plaster moulds are presented in this paper. Test samples were cut from stripe castings of dimensions 100x15x1 mm. Surfaces were carefully cleaned with use of soft brush than in ultrasonic washer and dried. Experimental castings were prepared in moulds made of two types of plaster. Cast temperatures were 1120 and 1200°C for bronzes and 700 and 800°C for silumin. Temperatures of the mould were 500 and 600°C for bronzes and 200 and 300°C for aluminum alloy. The roughness measurements were carried out with use of Hommelwerke Tester T1000. The average arithmetic deviation of roughness profile Ra, the ten-point height of irregularities Rz and maximum peak to valley height Rm, were measured. It can be stated, on the base of obtained results, that technology of casting in plaster moulds allows preparation of castings of very low roughness, average Ra=0,88÷1,74μm for bronzes and Ra=0,59÷0,83μm for aluminum alloys. Roughness of the surface depends in fact on the cast material. Type of plaster and casting parameters have negligible influence on it.

Słowa kluczowe

EN

modern casting material; modern casting technology; precision casting; plaster mould; surface roughness

PL

nowoczesny materiał odlewniczy; nowoczesna technologia odlewnicza; odlewanie precyzyjne; forma gipsowa; chropowatość powierzchni

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 3 spec.
• Strony: 157--162
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Pawlak M.

• Department of Materials Engineering and Production Systems, Technical University of Lodz 1/15, Stefanowskiego Str., 90-924 Łódź, Poland

Bibliografia

• [1] Lewandowski L.: Materiały formierskie (Moulding materials), AKAPIT, Warszawa.
• [2] Nelson C.D.: Plaster Molding, In: Metals Handbook, Vol. 15 Casting, p. 245.
• [3] Clegg A.J.: Precision Casting Processes, Pergamon Press, 1991, p. 120-121.
• [4] Skarbiński M.: Dokładność wymiarowa odlewów (The accuracy of casting), WN-T, Warszawa 1965, p. 475-476.
• [5] Pawlak M.: Proces wysokotemperaturowego wygrzewania form gipsowych dla odlewnictwa artystycznego (The firing gipsum mould for artistic casting). Archiwum Odlewnictwa, PAN, 2006, Nr 19, s. 213-220.
• [6] Pisarek B., Pawlak M.: Selection of the temperature of casting the bronzes to plaster moulds (Dobór temperatury odlewania brązów do form gipsowych). Archives of Foundry Engineering, Vol. 9, Issue 4, October – December 2009.
• [7] Instrukcja firmowa mieszalnika St. LOUIS 82 B/P firmy CIMO S.R.L. (Service instructions of mixer St. LOUIS 82 B/P by CIMO S.R.L.).
• [8] PN-87/M-04251 Struktura geometryczna powierzchni. Chropowatość powierzchni. Wartości liczbowe parametrów. (Geometrical structure of surface. Roughness of surface. Numerical values of parameters.).
• [9] PN-86/B-04360 Spoiwa gipsowe. Metody badań. Oznaczanie cech fizycznych (Binders based on calcium sulfate. Method of tests for physical properties).