{"id":2501,"date":"2020-08-23T11:19:40","date_gmt":"2020-08-23T11:19:40","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=2501"},"modified":"2020-08-23T11:19:40","modified_gmt":"2020-08-23T11:19:40","slug":"casting-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/casting-molten-aluminum\/","title":{"rendered":"Pengecoran Aluminium Cair"},"content":{"rendered":"

Pengecoran aluminium cair merupakan langkah penting untuk menghasilkan coran yang berkualitas. Untuk mencegah dan mengurangi cacat coran, hal-hal berikut ini perlu diperhatikan selama proses penuangan.<\/p>\n

\"Pengecoran<\/p>\n

Sebelum menuangkan aluminium cair, periksalah dengan cermat suhu aluminium cair, kapasitas sendok tuang, dan tingkat kekeringan lapisan permukaannya, serta kesiapan peralatan lainnya.<\/p>\n

Sebelum menuangkan aluminium cair, harap periksa dengan cermat suhu cetakan dan kondisi penyemprotan cat. Lapisan BN<\/a> merupakan faktor kunci dalam proses pengecoran cetakan logam. Kecepatan pendinginan cetakan logam sangat tinggi, cetakan tersebut tidak mengalami penyusutan, dan tidak memiliki porositas udara, yang pada dasarnya dapat ditingkatkan melalui pelapisan. Lapisan tersebut memiliki konduktivitas termal yang rendah dan laju pendinginan yang lambat, sehingga dapat meningkatkan laju pendinginan cetakan logam serta mencegah timbulnya penghalang dingin dan cacat pada hasil coran.<\/p>\n

Bubuk talek dalam lapisan tersebut berfungsi sebagai pelepas cetakan, sehingga mengurangi risiko cetakan logam mengalami penyusutan, yaitu memastikan cetakan dapat dilepas dengan baik, mencegah timbulnya cacat regangan, retakan, dan deformasi pada hasil coran, serta melindungi cetakan. Lapisan ini memiliki tingkat ventilasi tertentu, yang dapat mengatasi masalah cetakan logam tanpa ventilasi, serta mencegah terjadinya cacat lubang dan pori-pori. Oleh karena itu, kita harus memperhatikan peran lapisan BN.<\/p>\n

Proses penuangan tidak boleh dilakukan dalam kondisi angin kencang untuk menghindari oksidasi dan pembakaran yang hebat pada aluminium cair, yang dapat menyebabkan cacat, seperti inklusi oksida pada hasil coran. Terutama, kipas angin tidak boleh diarahkan ke tungku peleburan dan tungku penahan, apalagi ke wadah tuang selama proses penuangan.<\/p>\n

Saat menuangkan aluminium dari wadah peleburan, harap gunakan bagian bawah kantong untuk menyentuh dengan lembut lapisan oksida atau lapisan fluks pada permukaan cairan aluminium, kemudian celupkan sendok tuang secara perlahan ke dalam cairan peleburan, lalu gunakan bagian mulut sendok tuang yang lebar untuk mengambil aluminium cair, dan angkat sendok tuang dengan mantap.<\/p>\n

Saat memegang sendok tuang, telapak tangan harus rata, gerakan harus stabil, dan sendok tuang tidak boleh diangkat. Tingkat aluminium di dalam sendok tuang harus stabil dan tidak terganggu.<\/p>\n

Sebelum proses penuangan dimulai, terak di dalam wadah tuang harus dibersihkan untuk mencegah terak dan kerak oksida terbawa ke dalam coran saat penuangan aluminium cair.<\/p>","protected":false},"excerpt":{"rendered":"

Casting molten aluminum is an important step to obtain qualified castings. In order to prevent and reduce casting defects, the following matters should be paid attention to during pouring. Before pouring molten aluminum, carefully check the molten aluminum temperature, ladle capacity and the dryness of surface coating, as well as the preparation of other tools. […]<\/p>\n","protected":false},"author":1,"featured_media":2513,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[7038],"class_list":["post-2501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-casting-molten-aluminum"],"yoast_head":"\nCasting Molten Aluminum with Hot Top Casting Parts<\/title>\n<meta name=\"description\" content=\"Casting molten aluminum is an important step to obtain qualified castings. 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