An establish attempt of reasons of machining splinter formation in AC44200 alloy high pressure die castings

• Autorzy: Mutwil J.
• Języki publikacji: EN

Abstrakty

EN

A problem of splinter formation during machining the AC44200 alloy high pressure die casting has been experimental investigated. In order to establish the reason of this occurrence a set of 200 high pressure die casting of the tensile strength samples have been prepared. The tensile tests were carried out using a Zwick Z050 universal testing machine. JM-SPC program has been used for statistical analysis of test results. A large variability of tensile strength results has been found. In order to find the reason of this variability the fracture surface investigations (macrographs for all of samples and SEM micrographs for chosen samples) have been carried out. It has been establish that in all cases a significant decrease of tensile strength was caused by presence of inclusions or porosity. In lot of cases the inclusions have a form of oxide film.

Słowa kluczowe

EN

foundry production process; high pressure die castings; die-casting; oxide film; casting defect; machining splinter defect

PL

odlewnicze procesy produkcyjne; odlewnictwo wysokociśnieniowe; wady odlewów

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 3
• Strony: 159--166
• Opis fizyczny: Bibliogr. 12 poz., rys., wykr.

Twórcy

autor

Mutwil J.

• Department of Mechanical Engineering, University of Zielona Góra, Podgórna 50 Str., 65-246 Zielona Góra,

Bibliografia

• [1] G. O. Verran, R. P. Mendes, M. A. Rossi, Influence of injection parameters on defects formation in die casting Al12Si1,3Cu alloy: Experimental results and numeric simulation, Journal of Materials Processing Technology 179 (2005), 190-195.
• [2] J. Mutwil J., M. Michalski, K. Breitkopf-Jarowicz, K.Tomasik: Quality assurance in die casting foundry of Lumel S.A.- Analysis of defects of silumin casting of cover, Archives of Foundry, vol. 6, No 21 (1/2) (2006), 247-254 (in Polish).
• [3] J. Mutwil J., M. Michalski. A. Kędzierska, K.Tomasik.: Quality assurance in die casting foundry of Lumel S.A.- Analysis of defects of silumin casting of valve housing, Archives of Foundry, vol. 6, No 21 (1/2) (2006), 255-262 (in Polish).
• [4] M. Divandari, J. Campbell, Oxide film characteristic of Al-7Si-Mg alloy in dynamic conditions casting, International Journal of Cast Metals Research, Vol. 17, no. 3, (2004), 182-187.
• [5] D. Dispinar, J. Campbell, Critical assessment of reduced pressure test. Part 1: Porosity phenomena, International Journal of Cast Metals Research, Vol. 17, no. 5, (2004), 280-286.
• [6] D. Dispinar, J. Campbell, Critical assessment of reduced pressure test. Part 2: Quantification, International Journal of Cast Metals Research, Vol. 17, no. 5, (2004), 287-293.
• [7] X. Yang et al., Numerical modelling of entrainment of oxide film defects in filling of aluminium alloy casting, International Journal of Cast Metals Research, Vol. 17, no. 6, (2004), 321-331.
• [8] D. Dispinar, J. Campbell, Use of bifilm index as an assessment of liquid metal quality, International Journal of Cast Metals Research, Vol. 19, no. 1, (2006), 5-17.
• [9] J. Campbell, Castings, 2nd edn, Oxford, Butterworth-Heinemann, 2003.
• [10] J. Mutwil, Application of JM-SPC program for statistical control of foundry production processes, Archives of Foundry Engineering Vol. 8, No. 3 (2008), 153-158.
• [11] S. Pietrowski, B. Pisarek, R. Władysiak., Computer System for Quality Control of Silumins for Automotive Wheel, Archives of Foundry, Vol. 3, no. 10 (2003), 112-125 (in Polish).
• [12] S. Pietrowski, B. Pisarek, R. Władysiak., Influence of selected technological factors on silumins gas dissolution degree, Archives of Foundry, Vol. 3, no. 10 (2003), 126-132 (in Polish).