{"id":5426,"date":"2021-02-25T07:29:46","date_gmt":"2021-02-25T07:29:46","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=5426"},"modified":"2021-02-25T07:29:46","modified_gmt":"2021-02-25T07:29:46","slug":"air-slip-casting","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/air-slip-casting\/","title":{"rendered":"Pengecoran Hot Top dengan Metode Air Slip"},"content":{"rendered":"

Pengecoran slip udara juga dikenal sebagai pengecoran hot top bertekanan gas. Ini adalah teknologi pengecoran baru yang dikembangkan berdasarkan metode hot top, yang menyalurkan campuran udara dan minyak pelumas pada titik pertemuan tepi bawah hot top dengan cetakan, sehingga terbentuk tirai panas pelumas campuran minyak\/gas di antara logam cair atau ingot dan cetakan.<\/p>\n

Minyak dan gas membentuk sistem pelumasan berkelanjutan, yang menghasilkan tirai udara pelumas campuran minyak\/gas di antara cetakan dan logam cair, serta mengendalikan tekanan dan aliran minyak dan gas, sehingga tirai udara pelumas yang dihasilkan tetap stabil dan statis bersama logam cair. Perubahan tekanan menjadi seimbang. Di bawah pengaruh tekanan gas, logam cair atau ingot tidak bersentuhan dengan dinding cetakan, dan minyak itu sendiri berfungsi sebagai isolator. Kehilangan panas dari logam cair melalui dinding cetakan menjadi lebih lambat, dan bahkan pendinginan primer yang disebabkan oleh dinding cetakan pun dihilangkan. Pendinginan sekunder menyebabkan logam cair mengeras menjadi ingot, sehingga butiran kristalnya halus dan permukaannya mulus.<\/p>\n

\"Pengecoran<\/p>\n

Faktor-Faktor yang Mempengaruhi Pengecoran Hot Top dengan Slip Udara<\/h2>\n

Ketepatan alat kristalisasi<\/strong>. Selip udara pencetakan bagian atas panas<\/a>\u00a0yaitu dengan memanfaatkan tekanan balik yang dihasilkan oleh minyak\/gas untuk menyeimbangkan tekanan statis lelehan bagian atas yang panas guna mendukung pembentukan lelehan tersebut. Lelehan tersebut didinginkan secara langsung dan mengeras menjadi ingot tanpa bersentuhan dengan cetakan, dan titik pendinginan berada di dekat antarmuka padat-cair; profil pengkristalan cetakan pengecoran slip gas serupa dengan cetakan pengecoran elektromagnetik. Oleh karena itu, cetakan pengecoran slip udara harus sangat presisi.<\/p>\n

Tinggi kristalisator<\/strong>. Di dalam kristalisator, setiap perubahan pada laju pembuangan panas pada titik pemadatan awal ingot akan secara signifikan memengaruhi pembentukan lapisan kondensat. Ketika terjadi penyusutan akibat pemadatan, celah udara terbentuk di antara lapisan kondensat dan kristalisator, yang dapat dengan mudah menyebabkan segregasi dan memengaruhi kualitas permukaan ingot. Mengurangi derajat kristalisator dapat mengurangi luas permukaan kontak antara lapisan semi-padat dan kristalisator, memperpendek waktu tinggal lelehan di zona pendinginan primer, mengurangi peleburan ulang sekunder, serta menghasilkan kualitas permukaan ingot yang baik.<\/p>\n

Intensitas pendinginan<\/strong>. Kristalisator pengecoran dengan aliran udara memiliki tingkat pendinginan yang tinggi dan singkat, serta hampir tidak ada pendinginan primer. Saat logam cair mengeras, panasnya hampir seluruhnya diserap oleh air pendingin sekunder. Untuk memastikan ketinggian rongga cairan tetap stabil serta mencegah pergerakan garis padat ke atas dan terjadinya peleburan serta kebocoran aluminium, laju aliran air sekunder harus seragam, disemprotkan secara akurat pada posisi ingot, dan intensitas pendinginan harus tepat.<\/p>\n

Jumlah dan tekanan oli pelumas<\/strong>. Sistem pelumasan minyak-udara yang tepat merupakan inti dari proses pengecoran slip udara. Akibat perubahan ketinggian lelehan aluminium dan paduan aluminium di bagian atas panas serta transformasi paduan, tekanan statis yang secara langsung bekerja pada cetakan pun ikut berubah. Gaya gesekan yang besar terjadi antara cangkang kondensat dan cetakan, dan pendinginan primer pun ikut berubah seiring dengan hal tersebut. Untuk menghilangkan dampak negatif tersebut, perlu dibentuk lapisan isolasi dan pelumasan yang sesuai di antara cetakan dan logam cair. Pengecoran air-slip menggunakan sistem pelumasan yang terdiri dari minyak pelumas dan udara terkompresi untuk menciptakan tekanan balik minyak pelumas dan gas yang stabil di dalam cetakan, yang sesuai dengan kondisi lingkungan. Tekanan balik ini dapat diibaratkan sebagai tegangan awal untuk membentuk tirai udara pelumas campuran minyak\/gas, menyeimbangkan tekanan statis lelehan pada cetakan, serta menggunakan air pendingin sekunder untuk menyemprotkan langsung ke jarak konduksi panas hulu cangkang ingot guna mengontrol proses pemadatan dan bentuknya, serta mencapai kualitas ingot yang dibutuhkan. Jika udara terkompresi tidak ditambahkan ke kristalisator, lelehan akan langsung bersentuhan dengan dinding bagian dalam kristalisator, dan panas dari lelehan tersebut diserap oleh sistem pendingin primer untuk membentuk cangkang yang mengkristal. Ketika udara terkompresi dimasukkan, lelehan tidak bersentuhan langsung dengan dinding cetakan, sehingga membentuk tirai udara.<\/p>","protected":false},"excerpt":{"rendered":"

Air slip casting is also called gas-pressurized hot top casting. It is a new casting technology developed on the basis of the hot top, which introduces a mixture of air and lubricating oil at the junction of the lower edge of the hot top and the mold, so that oil\/gas mixture lubrication heat curtain is […]<\/p>\n","protected":false},"author":1,"featured_media":5428,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-5426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAir Slip Hot Top Casting | Gas-Pressurized Hot-Top Casting<\/title>\n<meta name=\"description\" content=\"Air slip casting is also called gas-pressurized hot top casting. 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