Bài giảng "Các phương pháp gia công tinh: Chương 10 - Đánh bóng" được biên soạn với các nội dung chính sau: Bản chất và công dụng của đánh bóng; Yêu cầu với quá trình đánh bóng; Các phương pháp đánh bóng cơ khí; Đánh bóng bằng đá mài đàn hồi; . Mời các bạn cùng tham khảo bài giảng. | CHƯƠNG 10 ĐÁNH BÓNG Polishing 323 Polishing Polishing and buffing are finishing processes for smoothing a workpiece s surface using an abrasive and a work wheel or a leather strop. Technically polishing refers to processes that use an abrasive that is glued to the work wheel while buffing uses a loose abrasive applied to the work wheel. Polishing is a more aggressive process while buffing is less harsh which leads to a smoother brighter common misconception is that a polished surface has a mirror bright finish however most mirror bright finishes are actually buffed. Process The condition of the material at hand determines what type of abrasive will be applied. The first stage if the material is unfinished starts with a rough abrasive perhaps 60 or 80 grit and each subsequent stage uses a finer abrasive such as 120 180 220 240 320 400 and higher grit abrasives until the desired finish is achieved. The rough . large grit passes remove imperfections within the metal surface like pits nicks lines and scratches. Applications Polishing may be used to enhance and restore the looks of certain metal parts or object on cars and other vehicles handrails cookware kitchenware and architectural metal. In other applications such as pharmaceutical dairy and specialty plumbing pipes are buffed to help prevent corrosion and to eliminate locations where bacteria or mold may reside. Buffing is also used to manufacture light reflectors. Common plastic polishing methods Flame polishing uses a hot flame to flow a plastic surface. Operator skill is critical with this method. When done properly flame plastic polishing produces the clearest finish especially when polishing acrylic. Flat external surfaces are the most applicable configuration for this method. Common plastic polishing methods Vapor polishing utilizes a chemical vapor which attacks the surface of the plastic causing it to flow. Acrylic unfortunately does not respond to this polishing process as well as .
