{"id":1372,"date":"2025-11-30T00:34:14","date_gmt":"2025-11-29T17:34:14","guid":{"rendered":"https:\/\/inoxcuongthinh.com\/chan-gap-inox-tam-chon-dao-coi-va-tinh-goc-chan-chuan-xac\/"},"modified":"2025-11-30T00:34:14","modified_gmt":"2025-11-29T17:34:14","slug":"chan-gap-inox-tam-chon-dao-coi-va-tinh-goc-chan-chuan-xac","status":"publish","type":"post","link":"https:\/\/inoxcuongthinh.com\/chan-gap-inox-tam-chon-dao-coi-va-tinh-goc-chan-chuan-xac\/","title":{"rendered":"Ch\u1ea5n g\u1ea5p Inox t\u1ea5m: Ch\u1ecdn dao\u2013c\u1ed1i v\u00e0 t\u00ednh g\u00f3c ch\u1ea5n chu\u1ea9n x\u00e1c"},"content":{"rendered":"<div class=\"custom-toc\">\n<h3>N\u1ed9i dung ch\u00ednh<\/h3>\n<ul>\n<li><a href=\"#toc-0-cac-phuong-phap-chan-va-khi-nao-dung\">C\u00e1c ph\u01b0\u01a1ng ph\u00e1p ch\u1ea5n v\u00e0 khi n\u00e0o d\u00f9ng<\/a><\/li>\n<li><a href=\"#toc-1-chon-coi-die-quy-tac-v-die-cho-inox\">Ch\u1ecdn c\u1ed1i (die): quy t\u1eafc V-die cho Inox<\/a><\/li>\n<li><a href=\"#toc-2-chon-dao-punch-goc-ban-kinh-mui-hinh-dang\">Ch\u1ecdn dao (punch): g\u00f3c, b\u00e1n k\u00ednh m\u0169i, h\u00ecnh d\u1ea1ng<\/a><\/li>\n<li><a href=\"#toc-3-tinh-luc-chan-tonnage-cho-inox\">T\u00ednh l\u1ef1c ch\u1ea5n (tonnage) cho Inox<\/a><\/li>\n<li><a href=\"#toc-4-tinh-ban-kinh-trong-do-dai-trien-flat-k-factor\">T\u00ednh b\u00e1n k\u00ednh trong, \u0111\u1ed9 d\u00e0i tri\u1ec3n (flat), K-factor<\/a><\/li>\n<li><a href=\"#toc-5-hoi-xuan-springback-va-bu-goc\">H\u1ed3i xu\u00e2n (springback) v\u00e0 b\u00f9 g\u00f3c<\/a><\/li>\n<li><a href=\"#toc-6-crowning-thang-goc-va-chat-luong-be-mat\">Crowning, th\u1eb3ng g\u00f3c v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t<\/a><\/li>\n<li><a href=\"#toc-7-quy-trinh-7-buoc-chon-daocoi-va-tinh-chuong-trinh\">Quy tr\u00ecnh 7 b\u01b0\u1edbc ch\u1ecdn dao\u2013c\u1ed1i v\u00e0 t\u00ednh ch\u01b0\u01a1ng tr\u00ecnh<\/a><\/li>\n<li><a href=\"#toc-8-vi-du-tinh-toan-thuc-te-sus304-t-20-mm\">V\u00ed d\u1ee5 t\u00ednh to\u00e1n th\u1ef1c t\u1ebf (SUS304, t = 2.0 mm)<\/a><\/li>\n<li><a href=\"#toc-9-loi-thuong-gap-va-cach-khac-phuc\">L\u1ed7i th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch kh\u1eafc ph\u1ee5c<\/a><\/li>\n<li><a href=\"#toc-10-goi-y-thiet-ke-de-de-chan-inox\">G\u1ee3i \u00fd thi\u1ebft k\u1ebf \u0111\u1ec3 d\u1ec5 ch\u1ea5n Inox<\/a><\/li>\n<li><a href=\"#toc-11-thong-so-tham-khao-nhanh\">Th\u00f4ng s\u1ed1 tham kh\u1ea3o nhanh<\/a><\/li>\n<li><a href=\"#toc-12-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/a><\/li>\n<li><a href=\"#toc-13-ket-luan\">K\u1ebft lu\u1eadn<\/a><\/li>\n<\/ul>\n<\/div>\n<p>Ch\u1ea5n g\u1ea5p Inox t\u1ea5m \u0111\u00f2i h\u1ecfi ch\u1ecdn \u0111\u00fang dao\u2013c\u1ed1i, t\u00ednh l\u1ef1c v\u00e0 g\u00f3c ch\u1ea5n chu\u1ea9n \u0111\u1ec3 \u0111\u1ea1t \u0111\u1ed9 ch\u00ednh x\u00e1c, b\u1ec1 m\u1eb7t \u0111\u1eb9p v\u00e0 kh\u00f4ng n\u1ee9t g\u00e3y. B\u00e0i vi\u1ebft n\u00e0y h\u1ec7 th\u1ed1ng h\u00f3a to\u00e0n b\u1ed9 k\u1ef9 thu\u1eadt: t\u1eeb ch\u1ecdn V-die, b\u00e1n k\u00ednh, g\u00f3c ch\u1ea5n, K-factor, b\u00f9 h\u1ed3i xu\u00e2n \u0111\u1ebfn v\u00ed d\u1ee5 t\u00ednh to\u00e1n th\u1ef1c t\u1ebf. \u0110\u00e2y l\u00e0 n\u1ed9i dung c\u1ed1t l\u00f5i trong gia c\u00f4ng ch\u1ea5n thu\u1ed9c nh\u00f3m ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o h\u00ecnh c\u1ee7a C\u1ea9m nang K\u1ef9 thu\u1eadt Gia c\u00f4ng Inox.<\/p>\n<h2 id=\"toc-0-cac-phuong-phap-chan-va-khi-nao-dung\">C\u00e1c ph\u01b0\u01a1ng ph\u00e1p ch\u1ea5n v\u00e0 khi n\u00e0o d\u00f9ng<\/h2>\n<p>&#8211; Ch\u1ea5n \u201cair bending\u201d: v\u1eadt li\u1ec7u ch\u1ec9 ch\u1ea1m \u1edf 3 \u0111i\u1ec3m (\u0111\u1ec9nh dao v\u00e0 2 m\u00e9p V-die). Linh ho\u1ea1t, \u00edt l\u1ef1c, \u0111i\u1ec1u ch\u1ec9nh \u0111\u01b0\u1ee3c b\u00e1n k\u00ednh. \u1ee8ng d\u1ee5ng ph\u1ed5 bi\u1ebfn nh\u1ea5t cho Inox t\u1ea5m 0.5\u20136 mm.<br \/>\n&#8211; Ch\u1ea5n \u00e9p s\u00e1t (bottoming): \u00e9p g\u1ea7n k\u00edn V, g\u00f3c \u1ed5n \u0111\u1ecbnh h\u01a1n, l\u1ef1c l\u1edbn h\u01a1n; d\u00f9ng khi c\u1ea7n \u0111\u1ed9 l\u1eb7p g\u00f3c cao, s\u1ea3n l\u01b0\u1ee3ng \u1ed5n \u0111\u1ecbnh.<br \/>\n&#8211; D\u1eadp th\u1eb3ng (coining): \u00e9p k\u00edn ho\u00e0n to\u00e0n, r\u1ea5t ch\u00ednh x\u00e1c nh\u01b0ng l\u1ef1c c\u1ef1c l\u1edbn; \u00edt d\u00f9ng v\u1edbi Inox do nguy c\u01a1 n\u1ee9t, m\u00e0i m\u00f2n dao\u2013c\u1ed1i cao.<\/p>\n<p>Khuy\u1ebfn ngh\u1ecb: v\u1edbi SUS 201\/304\/316 d\u00e0y \u22646 mm, \u01b0u ti\u00ean air bending + b\u00f9 h\u1ed3i xu\u00e2n; ch\u1ec9 d\u00f9ng bottoming khi y\u00eau c\u1ea7u g\u00f3c kh\u1eaft khe v\u00e0 \u0111\u1ee7 l\u1ef1c m\u00e1y.<\/p>\n<h2 id=\"toc-1-chon-coi-die-quy-tac-v-die-cho-inox\">Ch\u1ecdn c\u1ed1i (die): quy t\u1eafc V-die cho Inox<\/h2>\n<h3>Quy t\u1eafc nhanh<\/h3>\n<p>&#8211; Ch\u1ecdn V-die theo \u0111\u1ed9 d\u00e0y t: V \u2248 6 \u00d7 t (Inox). N\u1ebfu c\u1ea7n b\u00e1n k\u00ednh l\u1edbn\/\u00edt v\u1ebft h\u1eb1n \u2192 c\u00f3 th\u1ec3 ch\u1ecdn V = 8\u201310 \u00d7 t.<br \/>\n&#8211; B\u00e1n k\u00ednh trong d\u1ef1 ki\u1ebfn khi air bending: Ri \u2248 0.16 \u00d7 V (v\u1edbi Inox th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 0.16\u20130.20 \u00d7 V).<br \/>\n&#8211; Chi\u1ec1u d\u00e0i c\u00e1nh b\u1ebb t\u1ed1i thi\u1ec3u: Lmin \u2248 0.67 \u00d7 V (c\u00e1nh ng\u1eafn h\u01a1n d\u1ec5 t\u1ee5t xu\u1ed1ng V-die g\u00e2y m\u00e9o).<\/p>\n<p>G\u1ee3i \u00fd nhanh V-die (tham chi\u1ebfu s\u1ea3n xu\u1ea5t ph\u1ed5 bi\u1ebfn):<br \/>\n&#8211; t = 0.8 mm \u2192 V \u2248 5 mm<br \/>\n&#8211; t = 1.0 mm \u2192 V \u2248 6 mm<br \/>\n&#8211; t = 1.5 mm \u2192 V \u2248 9\u201310 mm<br \/>\n&#8211; t = 2.0 mm \u2192 V \u2248 12 mm<br \/>\n&#8211; t = 3.0 mm \u2192 V \u2248 18 mm<br \/>\n&#8211; t = 4.0 mm \u2192 V \u2248 24 mm<br \/>\n&#8211; t = 5.0 mm \u2192 V \u2248 30 mm<br \/>\n&#8211; t = 6.0 mm \u2192 V \u2248 36 mm<\/p>\n<p>L\u01b0u \u00fd:<br \/>\n&#8211; V qu\u00e1 nh\u1ecf \u2192 l\u1ef1c t\u0103ng m\u1ea1nh, nguy c\u01a1 n\u1ee9t m\u00e9p, h\u1eb1n s\u00e2u; V qu\u00e1 l\u1edbn \u2192 kh\u00f3 \u0111\u1ea1t g\u00f3c v\u00e0 \u0111\u1ed9 th\u1eb3ng.<br \/>\n&#8211; D\u00f9ng c\u1ed1i \u0111a r\u00e3nh (multi-V) cho x\u01b0\u1edfng \u0111a d\u1ea1ng \u0111\u1ed9 d\u00e0y; ki\u1ec3m tra b\u1ec1 m\u1eb7t V-die (\u0111\u00e1nh b\u00f3ng\/ ph\u1ee7) \u0111\u1ec3 h\u1ea1n ch\u1ebf tr\u1ea7y x\u01b0\u1edbc Inox.<\/p>\n<h2 id=\"toc-2-chon-dao-punch-goc-ban-kinh-mui-hinh-dang\">Ch\u1ecdn dao (punch): g\u00f3c, b\u00e1n k\u00ednh m\u0169i, h\u00ecnh d\u1ea1ng<\/h2>\n<p>&#8211; G\u00f3c dao: 85\u00b0\/88\u00b0 d\u00f9ng cho ch\u1ea5n g\u00f3c 90\u00b0 ki\u1ec3u air bending (cho ph\u00e9p b\u00f9 h\u1ed3i xu\u00e2n). Dao 30\u00b0\/60\u00b0 cho g\u00f3c nh\u1ecdn; dao 90\u00b0 cho bottoming.<br \/>\n&#8211; B\u00e1n k\u00ednh m\u0169i dao (nose radius): n\u00ean \u2265 0.5 \u00d7 t v\u1edbi Inox \u0111\u1ec3 gi\u1ea3m nguy c\u01a1 n\u1ee9t v\u00e0 v\u1ebft h\u1eb1n; ch\u1ecdn l\u1edbn h\u01a1n n\u1ebfu b\u1ec1 m\u1eb7t y\u00eau c\u1ea7u th\u1ea9m m\u1ef9 cao.<br \/>\n&#8211; H\u00ecnh d\u1ea1ng:<br \/>\n  &#8211; Gooseneck (c\u1ed5 ng\u1ed7ng) cho chi ti\u1ebft c\u00f3 g\u00e2n h\u1ed3i (return flange).<br \/>\n  &#8211; Dao radius cho g\u00f3c bo l\u1edbn.<br \/>\n  &#8211; B\u1ed9 dao\u2013c\u1ed1i chuy\u00ean d\u1ee5ng \u00e9p m\u00ed (hemming) g\u1ed3m dao t\u1ea1o n\u1ebfp v\u00e0 dao \u00e9p ph\u1eb3ng.<br \/>\n&#8211; \u0110\u1ed9 c\u1ee9ng\/ ph\u1ee7 b\u1ec1 m\u1eb7t: N\u00ean d\u00f9ng dao \u0111\u00e3 t\u00f4i v\u00e0 \u0111\u00e1nh b\u00f3ng; c\u00e2n nh\u1eafc ph\u1ee7 TiN\/TiCN \u0111\u1ec3 gi\u1ea3m d\u00ednh k\u1eb9o (galling) khi ch\u1ea5n Inox.<\/p>\n<h2 id=\"toc-3-tinh-luc-chan-tonnage-cho-inox\">T\u00ednh l\u1ef1c ch\u1ea5n (tonnage) cho Inox<\/h2>\n<p>C\u00f4ng th\u1ee9c g\u1ea7n \u0111\u00fang cho air bending (\u0111\u01a1n v\u1ecb SI):<br \/>\n&#8211; L\u1ef1c ri\u00eang theo chi\u1ec1u d\u00e0i: F\u2032 (kN\/m) \u2248 1.33 \u00d7 S \u00d7 t\u00b2 \/ V<br \/>\n  &#8211; S: c\u01b0\u1eddng \u0111\u1ed9 k\u00e9o (MPa), \u0111i\u1ec3n h\u00ecnh SUS304 ~ 600 MPa<br \/>\n  &#8211; t, V: mm<br \/>\n&#8211; T\u1ed5ng l\u1ef1c: F = F\u2032 \u00d7 L (m)<\/p>\n<p>V\u00ed d\u1ee5 nhanh:<br \/>\n&#8211; V\u1eadt li\u1ec7u SUS304, t = 2.0 mm; V = 12 mm; S \u2248 600 MPa; L = 0.5 m<br \/>\n&#8211; F\u2032 \u2248 1.33 \u00d7 600 \u00d7 4 \/ 12 = 266 kN\/m<br \/>\n&#8211; F \u2248 266 \u00d7 0.5 = 133 kN \u2248 13.6 t\u1ea5n l\u1ef1c<br \/>\nCh\u1ecdn m\u00e1y c\u00f3 bi\u00ean \u0111\u1ed9 an to\u00e0n \u2265 20\u201330% so v\u1edbi l\u1ef1c t\u00ednh.<\/p>\n<p>L\u01b0u \u00fd:<br \/>\n&#8211; Bottoming\/coining \u0111\u00f2i l\u1ef1c cao h\u01a1n nhi\u1ec1u (x\u1ea5p x\u1ec9 3\u20135 l\u1ea7n air bending).<br \/>\n&#8211; Khi ch\u1ea5n g\u1ea7n m\u00e9p l\u1ed7 ho\u1eb7c g\u00e2n d\u1eadp, y\u00eau c\u1ea7u l\u1ef1c cao h\u01a1n v\u00e0 d\u1ec5 bi\u1ebfn d\u1ea1ng.<\/p>\n<h2 id=\"toc-4-tinh-ban-kinh-trong-do-dai-trien-flat-k-factor\">T\u00ednh b\u00e1n k\u00ednh trong, \u0111\u1ed9 d\u00e0i tri\u1ec3n (flat), K-factor<\/h2>\n<h3>Thu\u1eadt ng\u1eef v\u00e0 c\u00f4ng th\u1ee9c<\/h3>\n<p>&#8211; Ri: b\u00e1n k\u00ednh trong sau ch\u1ea5n (\u01b0\u1edbc t\u00ednh t\u1eeb V-die nh\u01b0 tr\u00ean)<br \/>\n&#8211; A: g\u00f3c ch\u1ea5n (\u0111\u1ed9)<br \/>\n&#8211; K-factor: t\u1ec9 l\u1ec7 v\u1ecb tr\u00ed tr\u1ee5c trung h\u00f2a; v\u1edbi Inox air bending th\u01b0\u1eddng 0.42\u20130.50 (kh\u1edfi \u0111\u1ea7u 0.45)<br \/>\n&#8211; Bend Allowance (BA): chi\u1ec1u d\u00e0i cung trung h\u00f2a<br \/>\n  &#8211; BA = (\u03c0\/180) \u00d7 A \u00d7 (Ri + K \u00d7 t)<br \/>\n&#8211; Flat length (chi\u1ec1u d\u00e0i tri\u1ec3n) cho m\u1ed9t g\u00f3c:<br \/>\n  &#8211; Flat = L1 + L2 \u2212 BA<br \/>\n  &#8211; L1, L2: chi\u1ec1u d\u00e0i hai c\u00e1nh th\u00e0nh ph\u1ea9m \u0111o t\u1edbi giao tuy\u1ebfn l\u00fd thuy\u1ebft<\/p>\n<h3>H\u01b0\u1edbng c\u00e1n v\u00e0 b\u00e1n k\u00ednh t\u1ed1i thi\u1ec3u<\/h3>\n<p>&#8211; B\u1ebb song song th\u1edb c\u00e1n (along grain) d\u1ec5 n\u1ee9t h\u01a1n b\u1ebb vu\u00f4ng g\u00f3c; n\u00ean t\u0103ng Ri:<br \/>\n  &#8211; Vu\u00f4ng g\u00f3c th\u1edb: Ri t\u1ed1i thi\u1ec3u \u2248 1.0 \u00d7 t<br \/>\n  &#8211; Song song th\u1edb: Ri t\u1ed1i thi\u1ec3u \u2248 1.5\u20132.0 \u00d7 t<br \/>\n&#8211; B\u1ebb v\u1edbi bavia quay v\u00e0o trong (bavia \u1edf m\u1eb7t trong g\u00f3c) \u0111\u1ec3 gi\u1ea3m n\u1ee9t m\u00e9p.<\/p>\n<h2 id=\"toc-5-hoi-xuan-springback-va-bu-goc\">H\u1ed3i xu\u00e2n (springback) v\u00e0 b\u00f9 g\u00f3c<\/h2>\n<p>&#8211; Inox c\u00f3 h\u1ed3i xu\u00e2n l\u1edbn h\u01a1n th\u00e9p cacbon: th\u01b0\u1eddng 2\u20134\u00b0, c\u00f3 th\u1ec3 5\u20138\u00b0 v\u1edbi V l\u1edbn\/b\u00e1n k\u00ednh l\u1edbn.<br \/>\n&#8211; C\u00e1ch b\u00f9:<br \/>\n  &#8211; Ch\u1ecdn dao 85\u00b0\/88\u00b0 khi m\u1ee5c ti\u00eau 90\u00b0 \u0111\u1ec3 c\u00f3 bi\u00ean \u0111\u1ed9 over-bend.<br \/>\n  &#8211; L\u1eadp tr\u00ecnh over-bend: v\u00ed d\u1ee5 c\u1ea7n 90\u00b0 th\u00ec \u0111\u1eb7t g\u00f3c ch\u1ea5n 87\u00b0 (bao nhi\u00eau ph\u1ee5 thu\u1ed9c V, t, S).<br \/>\n  &#8211; D\u00f9ng bottoming khi c\u1ea7n g\u00f3c r\u1ea5t \u1ed5n \u0111\u1ecbnh tr\u00ean s\u1ea3n l\u01b0\u1ee3ng l\u1edbn (\u0111\u1ee7 l\u1ef1c).<br \/>\n&#8211; Ki\u1ec3m so\u00e1t h\u1ed3i xu\u00e2n:<br \/>\n  &#8211; D\u00f9ng c\u1ed1i V nh\u1ecf h\u01a1n (trong ph\u1ea1m vi an to\u00e0n l\u1ef1c) \u0111\u1ec3 gi\u1ea3m b\u00e1n k\u00ednh v\u00e0 h\u1ed3i xu\u00e2n.<br \/>\n  &#8211; D\u00f9ng c\u1ea3m bi\u1ebfn g\u00f3c\/ h\u1ec7 \u0111o l\u01b0\u1eddng tr\u00ean m\u00e1y ch\u1ea5n CNC, ch\u1ee9c n\u0103ng b\u00f9 \u0111\u00e0n h\u1ed3i theo v\u1eadt li\u1ec7u.<\/p>\n<h2 id=\"toc-6-crowning-thang-goc-va-chat-luong-be-mat\">Crowning, th\u1eb3ng g\u00f3c v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t<\/h2>\n<p>&#8211; Crowning (\u0111\u1ed9i b\u00e0n) b\u00f9 \u0111\u1ed9 v\u00f5ng b\u00e0n m\u00e1y tr\u00ean chi\u1ec1u d\u00e0i ch\u1ea5n; b\u1eaft bu\u1ed9c khi L > 500 mm, t d\u00e0y.<br \/>\n&#8211; D\u00f9ng \u0111\u1ec7m nh\u1ef1a, gi\u1ea5y kraft ho\u1eb7c phim b\u1ea3o v\u1ec7 tr\u00ean b\u1ec1 m\u1eb7t Inox hairline\/BA \u0111\u1ec3 tr\u00e1nh h\u1eb1n.<br \/>\n&#8211; V\u1ec7 sinh c\u1ea1nh V-die v\u00e0 m\u0169i dao, b\u00f4i tr\u01a1n nh\u1eb9 (n\u1ebfu ph\u00f9 h\u1ee3p) \u0111\u1ec3 h\u1ea1n ch\u1ebf galling.<\/p>\n<h2 id=\"toc-7-quy-trinh-7-buoc-chon-daocoi-va-tinh-chuong-trinh\">Quy tr\u00ecnh 7 b\u01b0\u1edbc ch\u1ecdn dao\u2013c\u1ed1i v\u00e0 t\u00ednh ch\u01b0\u01a1ng tr\u00ecnh<\/h2>\n<p>1) X\u00e1c \u0111\u1ecbnh v\u1eadt li\u1ec7u: m\u00e1c, t, tr\u1ea1ng th\u00e1i b\u1ec1 m\u1eb7t, th\u1edb c\u00e1n, S (MPa).<br \/>\n2) Ch\u1ecdn ph\u01b0\u01a1ng ph\u00e1p ch\u1ea5n: \u01b0u ti\u00ean air bending.<br \/>\n3) Ch\u1ecdn V-die: b\u1eaft \u0111\u1ea7u V \u2248 6t; ki\u1ec3m tra Lmin \u2265 0.67V; xem y\u00eau c\u1ea7u b\u1ec1 m\u1eb7t.<br \/>\n4) \u01af\u1edbc t\u00ednh Ri: Ri \u2248 0.16\u20130.20 \u00d7 V.<br \/>\n5) T\u00ednh BA v\u00e0 flat: d\u00f9ng K-factor 0.45 (test m\u1eabu \u0111\u1ec3 tinh ch\u1ec9nh).<br \/>\n6) T\u00ednh l\u1ef1c: F\u2032 \u2248 1.33 \u00d7 S \u00d7 t\u00b2 \/ V; ki\u1ec3m tra c\u00f4ng su\u1ea5t m\u00e1y, crowning.<br \/>\n7) L\u1eadp tr\u00ecnh g\u00f3c: \u0111\u1eb7t over-bend theo h\u1ed3i xu\u00e2n d\u1ef1 ki\u1ebfn; ch\u1ea1y th\u1eed, \u0111o g\u00f3c, hi\u1ec7u ch\u1ec9nh.<\/p>\n<h2 id=\"toc-8-vi-du-tinh-toan-thuc-te-sus304-t-20-mm\">V\u00ed d\u1ee5 t\u00ednh to\u00e1n th\u1ef1c t\u1ebf (SUS304, t = 2.0 mm)<\/h2>\n<p>B\u00e0i to\u00e1n: ch\u1ea5n g\u00f3c 90\u00b0, hai c\u00e1nh L1 = 40 mm, L2 = 30 mm, chi\u1ec1u d\u00e0i chi ti\u1ebft 500 mm.<br \/>\n&#8211; Ch\u1ecdn V-die: V = 12 mm (\u2248 6t). Ki\u1ec3m tra Lmin \u2248 0.67\u00d712 = 8.0 mm < 30 mm \u2192 \u0111\u1ea1t.\n- \u01af\u1edbc t\u00ednh b\u00e1n k\u00ednh trong: Ri \u2248 0.16\u00d712 = 1.92 mm (l\u00e0m tr\u00f2n 1.9 mm).\n- K-factor: ch\u1ecdn 0.45 cho air bending Inox.\n- BA: A = 90\u00b0 \u2192 BA = (\u03c0\/180)\u00d790\u00d7(1.9 + 0.45\u00d72.0)\n  = (\u03c0\/2)\u00d7(1.9 + 0.9) = 1.5708\u00d72.8 \u2248 4.40 mm\n- Chi\u1ec1u d\u00e0i tri\u1ec3n: Flat = 40 + 30 \u2212 4.40 = 65.60 mm\n- H\u1ed3i xu\u00e2n: d\u1ef1 ki\u1ebfn 3\u00b0 \u2192 l\u1eadp tr\u00ecnh over-bend 87\u00b0 (t\u00f9y m\u00e1y: nh\u1eadp \u201cg\u00f3c m\u1ee5c ti\u00eau\u201d 87\u00b0 \u0111\u1ec3 ra th\u00e0nh ph\u1ea9m 90\u00b0).\n- L\u1ef1c ch\u1ea5n: S \u2248 600 MPa\n  - F\u2032 \u2248 1.33\u00d7600\u00d7(2.0)\u00b2\/12 = 266 kN\/m\n  - L = 0.5 m \u2192 F \u2248 133 kN \u2248 13.6 t\u1ea5n\n- Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng: crowning theo b\u1ea3ng m\u00e1y; d\u00e1n phim b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t; \u0111o g\u00f3c 3 v\u1ecb tr\u00ed (\u0111\u1ea7u\u2013gi\u1eefa\u2013cu\u1ed1i), hi\u1ec7u ch\u1ec9nh \u00b10.5\u20131\u00b0 n\u1ebfu c\u1ea7n.\n\n\n\n<h2 id=\"toc-9-loi-thuong-gap-va-cach-khac-phuc\">L\u1ed7i th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch kh\u1eafc ph\u1ee5c<\/h2>\n<p>&#8211; N\u1ee9t m\u00e9p, r\u1ea1n ch\u00e2n g\u00f3c: V qu\u00e1 nh\u1ecf, m\u0169i dao qu\u00e1 s\u1eafc, b\u1ebb theo th\u1edb c\u00e1n. Kh\u1eafc ph\u1ee5c: t\u0103ng V, t\u0103ng b\u00e1n k\u00ednh m\u0169i dao, \u0111\u1ea3o h\u01b0\u1edbng th\u1edb ho\u1eb7c t\u0103ng Ri.<br \/>\n&#8211; G\u00f3c \u201ch\u1edf\u201d (thi\u1ebfu g\u00f3c): h\u1ed3i xu\u00e2n l\u1edbn do V l\u1edbn\/ v\u1eadt li\u1ec7u c\u1ee9ng. Kh\u1eafc ph\u1ee5c: t\u0103ng over-bend, \u0111\u1ed5i V nh\u1ecf h\u01a1n trong gi\u1edbi h\u1ea1n l\u1ef1c.<br \/>\n&#8211; H\u1eb1n s\u00e2u b\u1ec1 m\u1eb7t: V nh\u1ecf, l\u1ef1c l\u1edbn, dao\/c\u1ed1i th\u00f4. Kh\u1eafc ph\u1ee5c: \u0111\u00e1nh b\u00f3ng dao\u2013c\u1ed1i, th\u00eam \u0111\u1ec7m, t\u0103ng V v\u00e0 b\u00e1n k\u00ednh.<br \/>\n&#8211; Cong chu\u1ed1i (kh\u00f4ng th\u1eb3ng): thi\u1ebfu crowning ho\u1eb7c ph\u00f4i kh\u00f4ng \u0111\u1ec1u; b\u00f9 \u0111\u1ed9i b\u00e0n, ki\u1ec3m tra \u0111\u1ed9 d\u00e0y ph\u00f4i.<br \/>\n&#8211; Kh\u00f4ng \u0111\u1ea1t k\u00edch th\u01b0\u1edbc tri\u1ec3n: K-factor gi\u1ea3 \u0111\u1ecbnh sai. Kh\u1eafc ph\u1ee5c: l\u00e0m test bend \u0111\u1ec3 hi\u1ec7u ch\u1ec9nh K v\u1ec1 th\u1ef1c t\u1ebf l\u00f4 v\u1eadt li\u1ec7u.<\/p>\n<h2 id=\"toc-10-goi-y-thiet-ke-de-de-chan-inox\">G\u1ee3i \u00fd thi\u1ebft k\u1ebf \u0111\u1ec3 d\u1ec5 ch\u1ea5n Inox<\/h2>\n<p>&#8211; T\u0103ng kho\u1ea3ng c\u00e1ch l\u1ed7 so v\u1edbi \u0111\u01b0\u1eddng g\u1eadp \u2265 2 \u00d7 t + Ri \u0111\u1ec3 tr\u00e1nh bi\u1ebfn d\u1ea1ng l\u1ed7.<br \/>\n&#8211; Bo m\u00e9p (chamfer) ngay v\u1ecb tr\u00ed d\u1ec5 \u201c\u0111\u00e2m\u201d v\u00e0o V-die khi c\u00e1nh r\u1ea5t ng\u1eafn.<br \/>\n&#8211; V\u1edbi g\u00f3c g\u1eadp li\u00ean ti\u1ebfp g\u1ea7n nhau, c\u00e2n nh\u1eafc dao c\u1ed5 ng\u1ed7ng v\u00e0 tr\u00ecnh t\u1ef1 g\u1eadp \u0111\u1ec3 tr\u00e1nh va ch\u1ea1m.<\/p>\n<h2 id=\"toc-11-thong-so-tham-khao-nhanh\">Th\u00f4ng s\u1ed1 tham kh\u1ea3o nhanh<\/h2>\n<p>&#8211; V-die cho Inox: \u01b0u ti\u00ean V \u2248 6t; bi\u00ean \u0111\u1ed9 6\u201310t t\u00f9y y\u00eau c\u1ea7u b\u1ec1 m\u1eb7t v\u00e0 l\u1ef1c.<br \/>\n&#8211; Ri air bending: \u2248 0.16\u20130.20 V.<br \/>\n&#8211; K-factor Inox: 0.42\u20130.50 (kh\u1edfi \u0111\u1ea7u 0.45).<br \/>\n&#8211; H\u1ed3i xu\u00e2n: 2\u20134\u00b0 (c\u00f3 th\u1ec3 \u0111\u1ebfn 8\u00b0 v\u1edbi b\u00e1n k\u00ednh l\u1edbn).<br \/>\n&#8211; Lmin c\u00e1nh g\u1eadp: \u2248 0.67 V.<br \/>\n&#8211; Dao: 85\u00b0\/88\u00b0 cho m\u1ee5c ti\u00eau 90\u00b0; nose radius \u2265 0.5t.<\/p>\n<h2 id=\"toc-12-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/h2>\n<p>&#8211; The Fabricator \u2013 Air bending basics, Steve Benson (thefabricator.com).<br \/>\n&#8211; Amada Press Brake Bending Fundamentals \u2013 h\u01b0\u1edbng d\u1eabn l\u1ef1a ch\u1ecdn V-die, b\u00e1n k\u00ednh v\u00e0 l\u1ef1c (t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt c\u1ee7a Amada).<br \/>\n&#8211; Wilson Tool \u2013 Press Brake Bending: Die Selection and Bending Formulas (wilsontool.com).<br \/>\n&#8211; Datasheet Inox 304\/316 (ASTM A240) \u2013 c\u01a1 t\u00ednh v\u00e0 ph\u1ea1m vi \u0111\u1ed9 b\u1ec1n k\u00e9o; v\u00ed d\u1ee5: Outokumpu Stainless Steel Handbook (outokumpu.com).<\/p>\n<h2 id=\"toc-13-ket-luan\">K\u1ebft lu\u1eadn<\/h2>\n<p>\u0110\u1ec3 ch\u1ea5n g\u1ea5p Inox t\u1ea5m chu\u1ea9n x\u00e1c, h\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb n\u1ec1n t\u1ea3ng \u0111\u00fang: ch\u1ecdn V-die theo quy t\u1eafc 6\u00d7t, \u01b0\u1edbc t\u00ednh Ri \u2248 0.16\u20130.20V, d\u00f9ng K-factor ~0.45 \u0111\u1ec3 t\u00ednh BA v\u00e0 tri\u1ec3n ph\u00f4i, t\u00ednh l\u1ef1c theo F\u2032 \u2248 1.33\u00d7S\u00d7t\u00b2\/V, v\u00e0 b\u00f9 h\u1ed3i xu\u00e2n 2\u20134\u00b0. K\u00e8m theo \u0111\u00f3, t\u1ed1i \u01b0u dao (g\u00f3c 85\u00b0\/88\u00b0, m\u0169i \u22650.5t), ki\u1ec3m so\u00e1t crowning v\u00e0 b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t. Quy tr\u00ecnh n\u00e0y, c\u1ed9ng v\u1edbi test bend tinh ch\u1ec9nh K-factor v\u00e0 over-bend theo l\u00f4 v\u1eadt li\u1ec7u, s\u1ebd \u0111\u01b0a b\u1ea1n \u0111\u1ebfn g\u00f3c \u0111\u00fang, k\u00edch th\u01b0\u1edbc \u0111\u00fang v\u00e0 b\u1ec1 m\u1eb7t \u0111\u1eb9p ngay t\u1eeb l\u1ea7n \u0111\u1ea7u.<\/p>\n<p>C\u1ea7n t\u01b0 v\u1ea5n ch\u1ecdn dao\u2013c\u1ed1i, l\u1eadp tr\u00ecnh ch\u1ea5n CNC ho\u1eb7c b\u00e1o gi\u00e1 Inox t\u1ea5m ph\u00f9 h\u1ee3p? Li\u00ean h\u1ec7 Inox Cuong Thinh: Hotline 0343.417.281 \u2022 Email: inoxcongnghiep.cuongthinh@gmail.com<\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u01b0\u1edbng d\u1eabn ch\u1ecdn dao, c\u1ed1i, t\u00ednh l\u1ef1c v\u00e0 g\u00f3c ch\u1ea5n Inox t\u1ea5m: quy t\u1eafc ch\u1ecdn V-die, b\u00e1n k\u00ednh, K-factor, b\u00f9 h\u1ed3i xu\u00e2n, v\u00e0 v\u00ed d\u1ee5 t\u00ednh to\u00e1n chi ti\u1ebft.<\/p>\n","protected":false},"author":7,"featured_media":1016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1372","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"acf":[],"_links":{"self":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/comments?post=1372"}],"version-history":[{"count":0,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1372\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media\/1016"}],"wp:attachment":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media?parent=1372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/categories?post=1372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/tags?post=1372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}