PRPC法適用によるアルミニウム合金ダイカストの鋳巣圧着に関する検討(<小特集>自動車技術を支える材料力学)

概要

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The existence of porosity in aluminum alloy die castings is unavoidable. If any porosity was left in the final products, there are harmful influences on the air leakage resistance and structural strength. The PRPC (Porosity Reducing Post Compression) process, by which the product is compressed under the remaining heat of the die casting, has been investigated to enhance the product reliability. In this study, the validity of PRPC was examined, mainly focused on the pore closure and bonding of the contact inner surfaces. The porosity inside die casting was observed non-destructively by using X-ray CT. The experimental procedures were as follows; (1) X-ray CT observation of aluminum alloy die castings specimens was carried out in initial state. (2) Compression load simulating the PRPC process was applied to the specimen at room temperature or high temperature. (3) X-ray CT observation was performed again. (4) Tension load was applied to examine the closing and bonding effect of PRPC process on the inner surface of porosity. (5) Re-open of the closed porosity was observed by X-ray CT after tension break. In the PRPC process under room temperature, the closure of porosity was possible, but the re-open of the porosity occurred by tension loading. However, In the PRPC process under high temperature, we could confirm that the bonding of porosity was possible without re-open after tension loading.
社団法人日本機械学会の論文
2009-10-25