Nneɛma a ɛtwetwe ne nea ɛyɛ mmerɛw .
Saa void type sintɔ koro no ara, volumetric filling a ɛwɔ solidification mu no nnɔɔso, nsusuwii ne occurrence site no nkutoo na ɛyɛ soronko.
Nneɛma a ɛwɔ abura mu .
Mpɛn pii no, casting no a ɛyɛ den no nni awiei, ɛyɛ tokuru a ɛte sɛ tubular anaa nkorabata a ɛwɔ beae kɛse. asase ani shrinkage tokuru no yɛ nea wotumi hu wɔ aniwa so, na wobetumi ahu emu shrinkage cavities wɔ low magnification inspections.
Mrɛ
Mpɛn pii no, ntini nketenkete a apete wɔ dendrites no ntam, na ɛde casting. no mu nhyehyɛe a ɛbɛn no ba a ɛyɛ den a wotumi hu wɔ low-spectrum nhwehwɛmu no mu no yɛ macroscopic looseness; Looseness a wotumi hu wɔ microscope no ase no bɛyɛ microscopic looseness. microscopic looseness taa kyekyɛ wɔ dendrites no mu wɔ dendrites. ntam wɔ tebea horow a emu yɛ den mu no, pores no bata network ho. sɛ ɔhyew a wɔde di dwuma a, ntokuru no anoano yɛ dull na nsusuwii no yɛ smooth{5}}
casting krak .
Wɔ solidification nhyehyɛe no mu, esiane shrinkage a shrinkage, a kɛse mu nhyɛso ba nkakrankakra wɔ mu, na casting nhyɛso ba bere a party nhyɛso boro ahoɔden anohyeto. mpaapaemu a ɛba wɔ ɔhyew a ɛkorɔn mu no wɔfrɛ no ɔhyew a ɛkɔ soro krak, mpaapaemu yɛ zigzag, na nkɔso fa aburow hye so anaasɛ dendrites a wɔfrɛ no region frafters{2} Mpaapaemu, a mpɛn pii no ɛfa aburow mu, na mpaapaemu no mu paapae no wɔ dade a ɛyɛ hyew.
