{"id":7184,"date":"2024-12-02T04:26:31","date_gmt":"2024-12-02T04:26:31","guid":{"rendered":"https:\/\/protech-transfer.com\/2024\/12\/02\/cracks-and-tears-in-metal-casting-causes-and-prevention\/"},"modified":"2025-12-24T16:02:51","modified_gmt":"2025-12-24T16:02:51","slug":"cracks-and-tears-in-metal-casting-causes-and-prevention","status":"publish","type":"post","link":"https:\/\/protech-transfer.com\/vi\/2024\/12\/02\/cracks-and-tears-in-metal-casting-causes-and-prevention\/","title":{"rendered":"N\u1ee9t v\u00e0 R\u00e1ch trong \u0110\u00fac Kim Lo\u1ea1i: Nguy\u00ean Nh\u00e2n v\u00e0 Bi\u1ec7n Ph\u00e1p Ph\u00f2ng Ng\u1eeba"},"content":{"rendered":"<h3>Hi\u1ec3u v\u1ec1 N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i<\/h3>\n<p>C\u00e1c v\u1ebft n\u1ee9t trong \u0111\u00fac kim lo\u1ea1i c\u00f3 th\u1ec3 x\u1ea3y ra do nhi\u1ec1u nguy\u00ean nh\u00e2n, bao g\u1ed3m t\u00ednh gi\u00f2n, t\u1ea1p ch\u1ea5t v\u00e0 co ng\u00f3t. Vi\u1ec7c hi\u1ec3u r\u00f5 nguy\u00ean nh\u00e2n g\u00e2y n\u1ee9t trong \u0111\u00fac kim lo\u1ea1i l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng \u0111\u00fac v\u00e0 gi\u1ea3m thi\u1ec3u l\u1ed7i c\u0169ng nh\u01b0 ph\u1ebf ph\u1ea9m.<\/p>\n<h4>C\u00e1c Lo\u1ea1i N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i v\u00e0 Nguy\u00ean Nh\u00e2n<\/h4>\n<p><span style=\"font-family: arial, helvetica, sans-serif;\"><b>1. N\u1ee9t N\u00f3ng (Hot Cracks)<\/b><b><br \/>\n<\/b>N\u1ee9t n\u00f3ng l\u00e0 m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn nh\u1ea5t, h\u00ecnh th\u00e0nh khi kim lo\u1ea1i ngu\u1ed9i qu\u00e1 nhanh, \u0111\u1eb7c bi\u1ec7t trong giai \u0111o\u1ea1n kim lo\u1ea1i v\u1eabn c\u00f2n b\u00e1n l\u1ecfng. Qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i nhanh t\u1ea1o ra \u1ee9ng su\u1ea5t trong qu\u00e1 tr\u00ecnh \u0111\u00f4ng \u0111\u1eb7c, d\u1eabn \u0111\u1ebfn n\u1ee9t.M\u00e1y \u0111\u00fac c\u1ee7a Protech Transfer ng\u0103n ch\u1eb7n n\u1ee9t n\u00f3ng b\u1eb1ng c\u00e1ch cung c\u1ea5p kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 gi\u1ea3m thi\u1ec3u nguy c\u01a1 n\u1ee9t do l\u00e0m ngu\u1ed9i.<br \/>\n<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif;\"><b>2. N\u1ee9t Do Gi\u00f2n (Brittleness-Related Cracks)<\/b><\/span><\/p>\n<p>Khi v\u1eadt li\u1ec7u c\u1ee9ng ho\u1eb7c gi\u00f2n do t\u1ea1p ch\u1ea5t, oxit ho\u1eb7c th\u00e0nh ph\u1ea7n h\u1ee3p kim kh\u00f4ng ph\u00f9 h\u1ee3p, c\u00e1c v\u1ebft n\u1ee9t d\u1ec5 h\u00ecnh th\u00e0nh h\u01a1n. C\u00e1c gi\u1ea3i ph\u00e1p \u0111\u00fac d\u00e0nh ri\u00eang cho t\u1eebng h\u1ee3p kim l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 tr\u00e1nh n\u1ee9t.<br \/>\nM\u00e1y \u0111\u00fac \u0111\u1ed9 ch\u00ednh x\u00e1c cao c\u1ee7a Protech Transfer \u0111\u1ea3m b\u1ea3o qu\u00e1 tr\u00ecnh tr\u1ed9n h\u1ee3p kim trong m\u00f4i tr\u01b0\u1eddng b\u1ea3o v\u1ec7 trong khi n\u1ea5u ch\u1ea3y, t\u1eeb \u0111\u00f3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u0111\u1ed3ng nh\u1ea5t v\u00e0 gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u00e1c v\u1ebft n\u1ee9t do gi\u00f2n, oxit v\u00e0 t\u1ea1p ch\u1ea5t.<\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif;\"><b>3. Co Ng\u00f3t (Shrinkage) <\/b><\/span><\/p>\n<p>Co ng\u00f3t \u2013 k\u1ebft qu\u1ea3 c\u1ee7a s\u1ef1 h\u00ecnh th\u00e0nh khoang r\u1ed7 trong giai \u0111o\u1ea1n l\u00e0m ngu\u1ed9i \u2013 c\u00f3 th\u1ec3 l\u00e0m suy y\u1ebfu v\u1eadt li\u1ec7u v\u00e0 d\u1eabn \u0111\u1ebfn n\u1ee9t.Gi\u1ea3i ph\u00e1p \u0111\u00fac c\u1ee7a Protech Transfer, v\u1edbi kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 l\u00e0m ngu\u1ed9i, gi\u00fap t\u1ea1o ra s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng ch\u1eafc ch\u1eafn h\u01a1n b\u1eb1ng c\u00e1ch gi\u1ea3m thi\u1ec3u \u0111\u1ed9 gi\u00f2n trong \u0111\u00fac kim lo\u1ea1i.<\/p>\n<hr \/>\n<h4>X\u00e1c \u0110\u1ecbnh v\u00e0 Ki\u1ec3m Tra N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i<\/h4>\n<p>Vi\u1ec7c ph\u00e2n lo\u1ea1i n\u1ee9t c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c th\u1eed nghi\u1ec7m \u0111\u01a1n gi\u1ea3n nh\u01b0 ki\u1ec3m tra \u0111\u1ed9 gi\u00f2n b\u1eb1ng c\u00e1ch u\u1ed1n.<br \/>\n\u0110\u1ec3 ph\u00e2n t\u00edch n\u00e2ng cao h\u01a1n, k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t (SEM) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n t\u00edch c\u00e1c d\u1ea1ng khuy\u1ebft t\u1eadt v\u00e0 h\u1ed7 tr\u1ee3 c\u1ea3i thi\u1ec7n quy tr\u00ecnh \u0111\u00fac.<\/p>\n<hr \/>\n<h4>Bi\u1ec7n Ph\u00e1p Ng\u0103n Ng\u1eeba N\u1ee9t N\u00f3ng trong \u0110\u00fac Kim Lo\u1ea1i<\/h4>\n<p>Qu\u1ea3n l\u00fd nhi\u1ec7t \u0111\u1ed9 \u0111\u00fang c\u00e1ch l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 tr\u00e1nh n\u1ee9t n\u00f3ng, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c kim lo\u1ea1i nh\u01b0 b\u1ea1c.<br \/>\nD\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p quan tr\u1ecdng:<\/p>\n<ul>\n<li><span style=\"font-family: arial, helvetica, sans-serif;\"><strong>Ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u00ecnh \u0111\u00fac:<\/strong> \u0110\u1ec3 b\u00ecnh \u0111\u00fac ngu\u1ed9i trong bu\u1ed3ng \u00edt nh\u1ea5t 4 ph\u00fat tr\u01b0\u1edbc khi t\u00f4i n\u01b0\u1edbc gi\u00fap gi\u1ea3m nguy c\u01a1 n\u1ee9t n\u00f3ng.<br \/>\nH\u1ec7 th\u1ed1ng l\u00e0m ngu\u1ed9i ti\u00ean ti\u1ebfn c\u1ee7a Protech Transfer cung c\u1ea5p thi\u1ebft b\u1ecb gi\u1ea3m \u0111\u1ed9 gi\u00f2n trong \u0111\u00fac kim lo\u1ea1i, thu\u1eadn ti\u1ec7n cho vi\u1ec7c ng\u0103n ng\u1eeba c\u00e1c v\u1ea5n \u0111\u1ec1 do l\u00e0m ngu\u1ed9i g\u00e2y ra.<\/span><\/li>\n<li><span style=\"font-family: arial, helvetica, sans-serif;\"><strong>Thi\u1ebft k\u1ebf l\u1ea1i h\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn:<\/strong> Vi\u1ec7c thi\u1ebft k\u1ebf l\u1ea1i h\u1ec7 th\u1ed1ng sprue c\u00f3 th\u1ec3 gi\u1ea3m \u1ee9ng su\u1ea5t nhi\u1ec7t \u2013 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 ch\u00ednh g\u00e2y n\u1ee9t n\u00f3ng.<br \/>\nM\u00e1y m\u00f3c c\u1ee7a Protech Transfer cung c\u1ea5p c\u00e1c th\u00f4ng s\u1ed1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 t\u1ed1i \u01b0u d\u00f2ng ch\u1ea3y kim lo\u1ea1i, gi\u1ea3m n\u1ee9t do gi\u00f2n v\u00e0 n\u1ee9t n\u00f3ng.<\/span><\/li>\n<\/ul>\n<hr \/>\n<h4>Gi\u1ea3i Ph\u00e1p \u0110\u00fac Theo T\u1eebng Lo\u1ea1i V\u1eadt Li\u1ec7u<\/h4>\n<p>M\u1ed9t s\u1ed1 kim lo\u1ea1i, nh\u01b0 palladium, d\u1ec5 b\u1ecb n\u1ee9t n\u00f3ng h\u01a1n do c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 silicon, carbon v\u00e0 nhi\u1ec5m hydrogen.<br \/>\nM\u00e1y t\u1eeb Protech Transfer (<a href=\"https:\/\/www.otec.de\/en\/\" target=\"_blank\" rel=\"noopener\">Indutherm.de<\/a>) h\u1ed7 tr\u1ee3 s\u1eed d\u1ee5ng h\u1ee3p kim chuy\u00ean d\u1ee5ng v\u00e0 cung c\u1ea5p gi\u1ea3i ph\u00e1p \u0111\u00fac theo v\u1eadt li\u1ec7u nh\u1eb1m lo\u1ea1i b\u1ecf n\u1ee9t, \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p cho s\u1ea3n ph\u1ea9m palladium ch\u1ea5t l\u01b0\u1ee3ng cao.<\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><strong>M\u00c1Y M\u00d3C T\u1ed0T NH\u1ea4T \u2013 D\u1ecaCH V\u1ee4 T\u1ed0T NH\u1ea4T<\/strong><br \/>\n\u0110\u01b0\u1eddng d\u00e2y n\u00f3ng b\u00e1n h\u00e0ng: +66 8 6332 9347<br \/>\nID LINE b\u00e1n h\u00e0ng: @pttsales<br \/>\n\u0110\u01b0\u1eddng d\u00e2y n\u00f3ng d\u1ecbch v\u1ee5 24\/7: +66 8 9227 9154<br \/>\nID LINE h\u1ed7 tr\u1ee3 d\u1ecbch v\u1ee5: @pttsupport<br \/>\n<a href=\"https:\/\/protech-transfer.com\/vi\/\" target=\"_blank\" rel=\"noopener\">Xem t\u1ea5t c\u1ea3 m\u00e1y m\u00f3c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi\u1ec3u v\u1ec1 N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i C\u00e1c v\u1ebft n\u1ee9t trong \u0111\u00fac kim lo\u1ea1i c\u00f3 th\u1ec3 x\u1ea3y ra do nhi\u1ec1u nguy\u00ean nh\u00e2n, bao g\u1ed3m t\u00ednh gi\u00f2n, t\u1ea1p ch\u1ea5t v\u00e0 co ng\u00f3t. Vi\u1ec7c hi\u1ec3u r\u00f5 nguy\u00ean nh\u00e2n g\u00e2y n\u1ee9t trong \u0111\u00fac kim lo\u1ea1i l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec ch\u1ea5t l\u01b0\u1ee3ng \u0111\u00fac v\u00e0 gi\u1ea3m thi\u1ec3u l\u1ed7i c\u0169ng nh\u01b0 ph\u1ebf ph\u1ea9m. C\u00e1c Lo\u1ea1i N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i v\u00e0 Nguy\u00ean Nh\u00e2n 1. N\u1ee9t N\u00f3ng (Hot Cracks) N\u1ee9t n\u00f3ng l\u00e0 m\u1ed9t trong nh\u1eefng v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn nh\u1ea5t, h\u00ecnh th\u00e0nh khi kim lo\u1ea1i ngu\u1ed9i qu\u00e1 nhanh, \u0111\u1eb7c bi\u1ec7t trong giai \u0111o\u1ea1n kim lo\u1ea1i v\u1eabn c\u00f2n b\u00e1n l\u1ecfng. Qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i nhanh t\u1ea1o ra \u1ee9ng su\u1ea5t trong qu\u00e1 tr\u00ecnh \u0111\u00f4ng \u0111\u1eb7c, d\u1eabn \u0111\u1ebfn n\u1ee9t.M\u00e1y \u0111\u00fac c\u1ee7a Protech Transfer ng\u0103n ch\u1eb7n n\u1ee9t n\u00f3ng b\u1eb1ng c\u00e1ch cung c\u1ea5p kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 gi\u1ea3m thi\u1ec3u nguy c\u01a1 n\u1ee9t do l\u00e0m ngu\u1ed9i. 2. N\u1ee9t Do Gi\u00f2n (Brittleness-Related Cracks) Khi v\u1eadt li\u1ec7u c\u1ee9ng ho\u1eb7c gi\u00f2n do t\u1ea1p ch\u1ea5t, oxit ho\u1eb7c th\u00e0nh ph\u1ea7n h\u1ee3p kim kh\u00f4ng ph\u00f9 h\u1ee3p, c\u00e1c v\u1ebft n\u1ee9t d\u1ec5 h\u00ecnh th\u00e0nh h\u01a1n. C\u00e1c gi\u1ea3i ph\u00e1p \u0111\u00fac d\u00e0nh ri\u00eang cho t\u1eebng h\u1ee3p kim l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 tr\u00e1nh n\u1ee9t. M\u00e1y \u0111\u00fac \u0111\u1ed9 ch\u00ednh x\u00e1c cao c\u1ee7a Protech Transfer \u0111\u1ea3m b\u1ea3o qu\u00e1 tr\u00ecnh tr\u1ed9n h\u1ee3p kim trong m\u00f4i tr\u01b0\u1eddng b\u1ea3o v\u1ec7 trong khi n\u1ea5u ch\u1ea3y, t\u1eeb \u0111\u00f3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u0111\u1ed3ng nh\u1ea5t v\u00e0 gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u00e1c v\u1ebft n\u1ee9t do gi\u00f2n, oxit v\u00e0 t\u1ea1p ch\u1ea5t. 3. Co Ng\u00f3t (Shrinkage) Co ng\u00f3t \u2013 k\u1ebft qu\u1ea3 c\u1ee7a s\u1ef1 h\u00ecnh th\u00e0nh khoang r\u1ed7 trong giai \u0111o\u1ea1n l\u00e0m ngu\u1ed9i \u2013 c\u00f3 th\u1ec3 l\u00e0m suy y\u1ebfu v\u1eadt li\u1ec7u v\u00e0 d\u1eabn \u0111\u1ebfn n\u1ee9t.Gi\u1ea3i ph\u00e1p \u0111\u00fac c\u1ee7a Protech Transfer, v\u1edbi kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 l\u00e0m ngu\u1ed9i, gi\u00fap t\u1ea1o ra s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng ch\u1eafc ch\u1eafn h\u01a1n b\u1eb1ng c\u00e1ch gi\u1ea3m thi\u1ec3u \u0111\u1ed9 gi\u00f2n trong \u0111\u00fac kim lo\u1ea1i. X\u00e1c \u0110\u1ecbnh v\u00e0 Ki\u1ec3m Tra N\u1ee9t trong \u0110\u00fac Kim Lo\u1ea1i Vi\u1ec7c ph\u00e2n lo\u1ea1i n\u1ee9t c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c th\u1eed nghi\u1ec7m \u0111\u01a1n gi\u1ea3n nh\u01b0 ki\u1ec3m tra \u0111\u1ed9 gi\u00f2n b\u1eb1ng c\u00e1ch u\u1ed1n. \u0110\u1ec3 ph\u00e2n t\u00edch n\u00e2ng cao h\u01a1n, k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t (SEM) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n t\u00edch c\u00e1c d\u1ea1ng khuy\u1ebft t\u1eadt v\u00e0 h\u1ed7 tr\u1ee3 c\u1ea3i thi\u1ec7n quy tr\u00ecnh \u0111\u00fac. Bi\u1ec7n Ph\u00e1p Ng\u0103n Ng\u1eeba N\u1ee9t N\u00f3ng trong \u0110\u00fac Kim Lo\u1ea1i Qu\u1ea3n l\u00fd nhi\u1ec7t \u0111\u1ed9 \u0111\u00fang c\u00e1ch l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 tr\u00e1nh n\u1ee9t n\u00f3ng, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c kim lo\u1ea1i nh\u01b0 b\u1ea1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p quan tr\u1ecdng: Ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 b\u00ecnh \u0111\u00fac: \u0110\u1ec3 b\u00ecnh \u0111\u00fac ngu\u1ed9i trong bu\u1ed3ng \u00edt nh\u1ea5t 4 ph\u00fat tr\u01b0\u1edbc khi t\u00f4i n\u01b0\u1edbc gi\u00fap gi\u1ea3m nguy c\u01a1 n\u1ee9t n\u00f3ng. H\u1ec7 th\u1ed1ng l\u00e0m ngu\u1ed9i ti\u00ean ti\u1ebfn c\u1ee7a Protech Transfer cung c\u1ea5p thi\u1ebft b\u1ecb gi\u1ea3m \u0111\u1ed9 gi\u00f2n trong \u0111\u00fac kim lo\u1ea1i, thu\u1eadn ti\u1ec7n cho vi\u1ec7c ng\u0103n ng\u1eeba c\u00e1c v\u1ea5n \u0111\u1ec1 do l\u00e0m ngu\u1ed9i g\u00e2y ra. Thi\u1ebft k\u1ebf l\u1ea1i h\u1ec7 th\u1ed1ng \u1ed1ng d\u1eabn: Vi\u1ec7c thi\u1ebft k\u1ebf l\u1ea1i h\u1ec7 th\u1ed1ng sprue c\u00f3 th\u1ec3 gi\u1ea3m \u1ee9ng su\u1ea5t nhi\u1ec7t \u2013 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 ch\u00ednh g\u00e2y n\u1ee9t n\u00f3ng. M\u00e1y m\u00f3c c\u1ee7a Protech Transfer cung c\u1ea5p c\u00e1c th\u00f4ng s\u1ed1 \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ec3 t\u1ed1i \u01b0u d\u00f2ng ch\u1ea3y kim lo\u1ea1i, gi\u1ea3m n\u1ee9t do gi\u00f2n v\u00e0 n\u1ee9t n\u00f3ng. Gi\u1ea3i Ph\u00e1p \u0110\u00fac Theo T\u1eebng Lo\u1ea1i V\u1eadt Li\u1ec7u M\u1ed9t s\u1ed1 kim lo\u1ea1i, nh\u01b0 palladium, d\u1ec5 b\u1ecb n\u1ee9t n\u00f3ng h\u01a1n do c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 silicon, carbon v\u00e0 nhi\u1ec5m hydrogen. 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