{"id":4398,"date":"2025-06-27T11:50:20","date_gmt":"2025-06-27T03:50:20","guid":{"rendered":"https:\/\/www.oc-epc.com\/?p=4398"},"modified":"2025-07-01T17:00:51","modified_gmt":"2025-07-01T09:00:51","slug":"mat-bot-vo-duc-phuong-phap-vo-sup-do-nguyen-nhan-va-phan-tich","status":"publish","type":"post","link":"https:\/\/www.oc-epc.com\/vi\/news-blog\/industry-news\/lost-foam-shell-casting-method-shell-collapse-causes-and-analysis\/","title":{"rendered":"Ph\u01b0\u01a1ng ph\u00e1p \u0111\u00fac v\u1ecf b\u1ecdt b\u1ecb m\u1ea5t S\u1ef1 s\u1ee5p \u0111\u1ed5 v\u1ecf: Nguy\u00ean nh\u00e2n v\u00e0 ph\u00e2n t\u00edch"},"content":{"rendered":"

<\/h1>\n

Gi\u1edbi thi\u1ec7u v\u1ec1 Lost Foam Shell Casting Method<\/strong><\/h2>\n

Ph\u01b0\u01a1ng ph\u00e1p \u0111\u00fac v\u1ecf b\u1ecdt b\u1ecb m\u1ea5t l\u00e0 m\u1ed9t s\u1ef1 lai c\u1ee7a \u0111\u00fac \u0111\u1ea7u t\u01b0 (v\u1ecf) v\u00e0 \u0111\u00fac b\u1ecdt b\u1ecb m\u1ea5t (m\u1eabu h\u01a1i h\u01a1i)<\/b><\/u><\/strong><\/a>Trong qu\u00e1 tr\u00ecnh n\u00e0y, m\u1ed9t m\u1eabu b\u1ecdt c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng (th\u01b0\u1eddng l\u00e0 EPS) \u0111\u01b0\u1ee3c ph\u1ee7 b\u1eb1ng l\u1edbp ph\u1ee7 g\u1ed1m ch\u1ed1ng nhi\u1ec7t \u0111\u1ed9 cao (ch\u1ed1ng ch\u00e1y) v\u00e0 n\u01b0\u1edbng \u0111\u1ec3 h\u00ecnh th\u00e0nh m\u1ed9t v\u1ecf c\u1ee9ng tr\u00ean b\u1ecdt. M\u00f4 h\u00ecnh b\u1ecdt \u0111\u01b0\u1ee3c ph\u1ee7 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong m\u1ed9t h\u1ed9p khu\u00f4n c\u00e1t kh\u00f4 v\u00e0 m\u1ed9t ch\u00e2n kh\u00f4ng (\u00e1p su\u1ea5t \u00e2m) \u0111\u01b0\u1ee3c v\u1ebd.<\/p>\n

Tr\u01b0\u1edbc khi \u0111\u1ed5, m\u1eabu b\u1ecdt \u0111\u01b0\u1ee3c ch\u00e1y (th\u01b0\u1eddng \u1edf sprue), \u0111\u1ec3 b\u1ecdt b\u1ecb \u0111\u1ed1t ch\u00e1y, \u0111\u1ec3 l\u1ea1i m\u1ed9t v\u1ecf g\u1ed1m r\u1ed7ng b\u00ean trong c\u00e1t. Kim lo\u1ea1i tan ch\u1ea3y sau \u0111\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ed5 v\u00e0o khoang s\u01a1 t\u00e1n. K\u1ebft qu\u1ea3 l\u00e0 \u0111\u00fac ch\u00ednh x\u00e1c cao (so s\u00e1nh v\u1edbi \u0111\u00fac \u0111\u1ea7u t\u01b0 v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t) v\u1edbi h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 khuy\u1ebft t\u1eadt li\u00ean quan \u0111\u1ebfn cacbon t\u1eeb b\u1ecdt. Qu\u00e1 tr\u00ecnh t\u1ed5ng th\u1ec3 - t\u1eeb ch\u1ebf t\u1ea1o m\u1eabu th\u00f4ng qua \u0111\u1ed5 - \u0111\u01a1n gi\u1ea3n, hi\u1ec7u qu\u1ea3 v\u00e0 chi ph\u00ed th\u1ea5p, v\u00e0 v\u1ec1 c\u01a1 b\u1ea3n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f9ng thi\u1ebft b\u1ecb nh\u01b0 \u0111\u00fac b\u1ecdt b\u1ecb m\u1ea5t th\u00f4ng th\u01b0\u1eddng. Ch\u1ec9 c\u00f3 m\u1ed9t b\u01b0\u1edbc b\u1ed5 sung (ch\u00e1y b\u1ecdt) \u0111\u01b0\u1ee3c th\u00eam ngay tr\u01b0\u1edbc khi \u0111\u1ed5, v\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i c\u00f4ng c\u1ee5 \u0111\u1eb7c bi\u1ec7t.<\/p>\n

 <\/p>\n

\"M\u1ea5t<\/strong><\/h2>\n

M\u00f4 t\u1ea3 quy tr\u00ecnh<\/strong><\/h2>\n

Qu\u00e1 tr\u00ecnh \u0111i\u1ec3n h\u00ecnh bao g\u1ed3m m\u1ed9t s\u1ed1 b\u01b0\u1edbc ch\u00ednh:<\/p>\n

S\u1ea3n xu\u1ea5t m\u1eabu:<\/strong>\u00a0M\u1ed9t m\u1eabu b\u1ecdt \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo h\u00ecnh d\u1ea1ng ch\u00ednh x\u00e1c v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a \u0111\u00fac mong mu\u1ed1n. Nhi\u1ec1u l\u1edbp s\u01a1n ch\u1ed1ng l\u1eeda \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng tr\u00ean b\u1ec1 m\u1eb7t c\u1ee7a m\u1eabu v\u00e0 kh\u00f4 (th\u01b0\u1eddng trong l\u00f2) \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t v\u1ecf m\u1ecfng, c\u1ee9ng. V\u1ecf n\u00e0y s\u1ebd ph\u1ee5c v\u1ee5 nh\u01b0 khu\u00f4n \u0111\u00fac m\u1ed9t khi b\u1ecdt \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf.<\/p>\n

\u0110\u00f3ng g\u00f3i khu\u00f4n:<\/strong>\u00a0M\u00f4 h\u00ecnh b\u1ecdt \u0111\u01b0\u1ee3c ph\u1ee7 \u0111\u01b0\u1ee3c \u0111\u1eb7t trong m\u1ed9t h\u1ed9p khu\u00f4n c\u00e1t kh\u00f4. C\u00e1t \u0111\u01b0\u1ee3c rung ho\u1eb7c \u0111\u00e2m \u0111\u1ec3 n\u00e9n n\u00f3 m\u1ed9t c\u00e1ch tho\u1ea3i m\u00e1i xung quanh m\u00f4 h\u00ecnh. Sau \u0111\u00f3 c\u00e1c m\u1eabu h\u1ec7 th\u1ed1ng c\u1eeda (sprue v\u00e0 riser) \u0111\u01b0\u1ee3c \u0111\u1ecbnh v\u1ecb: ch\u00fang \u0111\u01b0\u1ee3c ch\u00f4n trong c\u00e1t \u0111\u1ec3 \u0111\u1ec9nh c\u1ee7a ch\u00fang \u1edf ho\u1eb7c ngay tr\u00ean b\u1ec1 m\u1eb7t khu\u00f4n. H\u1ed9p khu\u00f4n sau \u0111\u00f3 \u0111\u01b0\u1ee3c bao ph\u1ee7 b\u1eb1ng m\u1ed9t b\u1ed9 phim nh\u1ef1a (t\u1ea5m ni\u00eam phong) ph\u1eb3ng tr\u00ean c\u00f9ng.<\/p>\n

L\u1eafp \u0111\u1eb7t c\u1eeda v\u00e0 ch\u00e2n kh\u00f4ng:<\/strong>\u00a0V\u1edbi phim \u1edf v\u1ecb tr\u00ed, d\u1ea3i \u0111\u1ea5t s\u00e9t (c\u00e1t d\u00ednh) \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp xung quanh m\u1edf c\u1eeda \u0111\u1ed5 v\u00e0 c\u1ed1c \u0111\u1ed5 (c\u1ed1c sprue) \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o b\u00ean ngo\u00e0i. Cu\u1ed1i c\u00f9ng, h\u1ed9p c\u00e1t \u0111\u01b0\u1ee3c ni\u00eam phong v\u00e0 k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t m\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng, s\u01a1 t\u00e1n n\u1ed9i th\u1ea5t \u0111\u1ebfn \u00e1p su\u1ea5t \u00e2m c\u1ea7n thi\u1ebft.<\/p>\n

Sau c\u00e1c b\u01b0\u1edbc n\u00e0y, khu\u00f4n \u0111\u00f3ng g\u00f3i \u0111\u00e3 s\u1eb5n s\u00e0ng \u0111\u1ec3 \u0111\u1ed5. M\u00f4 h\u00ecnh b\u1ecdt (v\u00e0 b\u1ea5t k\u1ef3 b\u1ecdt n\u00e0o trong c\u1eeda) \u0111\u01b0\u1ee3c ch\u00e1y (th\u01b0\u1eddng t\u1eeb c\u1ed1c sprue) d\u01b0\u1edbi ch\u00e2n kh\u00f4ng. B\u1ecdt ch\u00e1y ra nhanh ch\u00f3ng, v\u00e0 kh\u00ed th\u1ea3i \u0111\u01b0\u1ee3c h\u00fat ra b\u1edfi h\u1ec7 th\u1ed1ng ch\u00e2n kh\u00f4ng. M\u1ed9t khi h\u1ea7u h\u1ebft b\u1ecdt \u0111\u00e3 bi\u1ebfn m\u1ea5t (th\u01b0\u1eddng 90% b\u1ecb \u0111\u1ed1t ch\u00e1y), kim lo\u1ea1i n\u00f3ng ch\u1ea3y \u0111\u01b0\u1ee3c \u0111\u1ed5 v\u00e0o khoang. V\u1ecf g\u1ed1m b\u00e2y gi\u1edd h\u1ed7 tr\u1ee3 kim lo\u1ea1i, v\u00e0 \u0111\u00fac c\u1ee9ng r\u1eafn v\u1edbi h\u00ecnh d\u1ea1ng ch\u00ednh x\u00e1c c\u1ee7a m\u1eabu b\u1ecdt ban \u0111\u1ea7u.<\/p>\n

 <\/p>\n

\"M\u1ea5t<\/strong><\/h2>\n

L\u1ee3i th\u1ebf v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m<\/strong><\/h2>\n

Qu\u00e1 tr\u00ecnh \u0111\u00fac v\u1ecf b\u1ecdt m\u1ea5t cung c\u1ea5p l\u1ee3i \u00edch \u0111\u00e1ng k\u1ec3. B\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf m\u1eabu b\u1ecdt tr\u01b0\u1edbc khi l\u00e0m \u0111\u1ea7y kim lo\u1ea1i, n\u00f3 h\u1ea7u nh\u01b0 lo\u1ea1i b\u1ecf c\u00e1c \"khi\u1ebfm khuy\u1ebft carbon\" v\u1ed1n c\u00f3 trong \u0111\u00fac b\u1ecdt b\u1ecb m\u1ea5t th\u00f4ng th\u01b0\u1eddng. Nh\u1eefng khuy\u1ebft t\u1eadt n\u00e0y (t\u1eeb carbon c\u00f2n l\u1ea1i b\u1edfi b\u1ecdt) bao g\u1ed3m carbon d\u01b0 th\u1eeba trong \u0111\u00fac, bao g\u1ed3m n\u1ebfp nh\u0103n b\u1ec1 m\u1eb7t, th\u00e0nh ph\u1ea7n h\u1ee3p kim kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, h\u1ea1t th\u00f4, v\u00f9ng b\u1ec1 m\u1eb7t c\u1ee9ng \/ gi\u00f2n v\u00e0 \u0111\u1ed9 x\u1ed1p.<\/p>\n

Lo\u1ea1i b\u1ecf c\u00e1c ngu\u1ed3n carbon n\u00e0y t\u1ea1o ra \u0111\u00fac tuy\u1ec7t v\u1eddi v\u1edbi ch\u1ea5t l\u01b0\u1ee3ng n\u1ed9i b\u1ed9 v\u00e0 b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n. Trong th\u1ef1c t\u1ebf, \u0111\u00fac \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 th\u1ec3 ti\u1ebfp c\u1eadn m\u1ee9c \u0111\u1ed9 ch\u1ea5t l\u01b0\u1ee3ng \u0111\u00fac \u0111\u1ea7u t\u01b0, trong khi v\u1eabn cho ph\u00e9p h\u00ecnh h\u1ecdc l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p v\u1edbi chi ph\u00ed t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p.<\/p>\n

Tuy nhi\u00ean, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u0169ng c\u00f3 nh\u1eefng th\u00e1ch th\u1ee9c. Qu\u00e1 tr\u00ecnh n\u00e0y nh\u1ea1y c\u1ea3m v\u1edbi \u0111i\u1ec1u ki\u1ec7n ch\u00e2n kh\u00f4ng. M\u1ed9t ch\u00e2n kh\u00f4ng ban \u0111\u1ea7u \u0111\u1ee7 cao (v\u00ed d\u1ee5: > 0,06) \u202f \u00c1p su\u1ea5t \u00e2m MPa) ph\u1ea3i \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp tr\u01b0\u1edbc khi b\u1ecdt \u0111\u1ed1t ch\u00e1y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t ch\u00e2n kh\u00f4ng khi\u00eam t\u1ed1n (\u22480,02 MPa) v\u1eabn c\u00f2n sau khi \u0111\u1ed1t ch\u00e1y. N\u1ebfu ch\u00e2n kh\u00f4ng ban \u0111\u1ea7u l\u00e0 qu\u00e1 th\u1ea5p, b\u1ecdt \u0111\u1ed1t ra g\u00e2y m\u1ea5t nhanh ch\u00f3ng ch\u00e2n kh\u00f4ng v\u00e0 khu\u00f4n s\u1ee5p \u0111\u1ed5.<\/p>\n

Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu ch\u00e2n kh\u00f4ng qu\u00e1 cao, c\u00e1c khuy\u1ebft t\u1eadt kh\u00e1c nh\u01b0 c\u00e1t d\u00ednh ho\u1eb7c \u0111\u1ed9 x\u1ed1p trong \u0111\u00fac c\u00f3 th\u1ec3 x\u1ea3y ra. Ngo\u00e0i ra, khi m\u00f4 h\u00ecnh b\u1ecdt \u0111\u01b0\u1ee3c ti\u00eau th\u1ee5, phim nh\u1ef1a (che khu\u00f4n) c\u00f3 th\u1ec3 \u0111\u1ed1t qua \u1edf giao di\u1ec7n sprue ho\u1eb7c riser, cho ph\u00e9p kh\u00f4ng kh\u00ed ho\u1eb7c c\u00e1t r\u00f2 r\u1ec9 v\u00e0o. M\u1ea5t \u00e1p su\u1ea5t \u0111\u1ed9t ng\u1ed9t n\u00e0y (\"ba r\u00f2 r\u1ec9\" c\u00e1t, kh\u00f4ng kh\u00ed ho\u1eb7c kim lo\u1ea1i) c\u00f3 th\u1ec3 khi\u1ebfn khu\u00f4n s\u1ee5p \u0111\u1ed5 ho\u1eb7c m\u1eafc k\u1eb9t c\u00e1t trong \u0111\u00fac. Trong th\u1ef1c t\u1ebf, c\u00e1c y\u1ebfu t\u1ed1 n\u00e0y c\u00f3 th\u1ec3 l\u00e0m cho qu\u00e1 tr\u00ecnh kh\u00f4ng \u1ed5n \u0111\u1ecbnh m\u00e0 kh\u00f4ng c\u00f3 c\u00e1c bi\u1ec7n ph\u00e1p ch\u1ed1ng l\u1ea1i b\u1ed5 sung.<\/p>\n

S\u1ef1 s\u1ee5p \u0111\u1ed5 v\u1ecf: Nguy\u00ean nh\u00e2n v\u00e0 ph\u00e2n t\u00edch<\/strong><\/h2>\n

\"M\u1ea5t<\/p>\n

M\u1ed9t khuy\u1ebft t\u1eadt quan tr\u1ecdng trong \u0111\u00fac v\u1ecf b\u1ecdt b\u1ecb m\u1ea5t l\u00e0 shell s\u1ee5p \u0111\u1ed5<\/strong>\u00a0(c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 khuy\u1ebft t\u1eadt gh\u1ebf sofa). S\u1ef1 s\u1ee5p \u0111\u1ed5 th\u01b0\u1eddng x\u1ea3y ra trong \u0111\u00fac l\u1edbn ho\u1eb7c c\u00e1c ph\u1ea7n c\u00f3 khoang k\u00edn, th\u01b0\u1eddng trong khi \u0111\u1ed5 ho\u1eb7c c\u1ee9ng r\u1eafn. Nguy\u00ean nh\u00e2n ch\u00ednh bao g\u1ed3m:<\/p>\n

\"Flash flow\" kim lo\u1ea1i tan ch\u1ea3y.<\/strong>\u00a0Trong khi \u0111\u1ed5, m\u1ed9t ph\u1ea7n kim lo\u1ea1i c\u00f3 th\u1ec3 chuy\u1ec3n h\u01b0\u1edbng d\u01b0\u1edbi c\u00e1c l\u1ef1c b\u00ean ngo\u00e0i v\u00e0 v\u01b0\u1ee3t qua m\u1ed9t s\u1ed1 khu v\u1ef1c c\u1ee7a khoang. N\u00f3i c\u00e1ch kh\u00e1c, m\u1ed9t s\u1ed1 kim lo\u1ea1i ch\u1ea3y qua khu v\u1ef1c d\u1ef1 \u0111\u1ecbnh v\u00e0 \u0111\u1ec3 l\u1ea1i m\u1ed9t s\u1ed1 kh\u1ed1i l\u01b0\u1ee3ng khoang kh\u00f4ng \u0111\u1ea7y. Hi\u1ec7u \u1ee9ng \"d\u00f2ng ch\u1ea3y flash\" n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u1ea5u tr\u00fac c\u00e1t \u0111\u01b0\u1ee3c t\u1ea3i kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u, l\u00e0m t\u0103ng nguy c\u01a1 s\u1ee5p \u0111\u1ed5 \u1edf c\u00e1c khu v\u1ef1c kh\u00f4ng t\u1ea3i.<\/p>\n

S\u1ee9c m\u1ea1nh l\u1edbp ph\u1ee7 kh\u00f4ng \u0111\u1ee7.<\/strong>\u00a0Tr\u01b0\u1edbc khi ch\u00e1y h\u1ebft, m\u00f4 h\u00ecnh b\u1ecdt \u0111\u1ec7m kim lo\u1ea1i \u0111\u1ebfn v\u00e0 b\u1ea3o v\u1ec7 c\u00e1t. Sau khi lo\u1ea1i b\u1ecf b\u1ecdt, khu\u00f4n c\u00e1t ch\u1ec9 ph\u1ea3i \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi l\u1edbp ph\u1ee7 c\u1ee9ng. N\u1ebfu l\u1edbp ph\u1ee7 thi\u1ebfu kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u00e1y ho\u1eb7c \u0111\u1ed9 b\u1ec1n nhi\u1ec7t \u0111\u1ed9 cao, n\u00f3 kh\u00f4ng th\u1ec3 h\u1ed7 tr\u1ee3 \u0111\u1ea7y \u0111\u1ee7 tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 x\u00f3i m\u00f2n c\u1ee7a d\u00f2ng kim lo\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3, kim lo\u1ea1i n\u00f3ng c\u00f3 th\u1ec3 x\u00f3i m\u00f2n v\u00e0 l\u00e0m suy y\u1ebfu c\u00e1t xung quanh t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng, khi\u1ebfn n\u00f3 s\u00e2n v\u00e0o. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t c\u00f3 kh\u1ea3 n\u0103ng g\u1ea7n c\u00e1c c\u1ed5ng b\u00ean trong l\u1edbn ho\u1eb7c c\u00e1c ph\u1ea7n m\u1ecfng, n\u01a1i v\u1ecf h\u1ed7 tr\u1ee3 \u0111ang ch\u1ecbu t\u1ea3i kim lo\u1ea1i n\u1eb7ng.<\/p>\n

Ti\u1ebfn h\u00f3a kh\u00ed qu\u00e1 m\u1ee9c.<\/strong>\u00a0\u0110\u1ed1t ra m\u1ed9t m\u1eabu b\u1ecdt d\u00e0y d\u01b0\u1edbi ch\u00e2n kh\u00f4ng t\u1ea1o ra m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn kh\u00ed \u0111\u1ed9t nhi\u00ean. N\u1ebfu c\u00e1c l\u1ed7 th\u00f4ng gi\u00f3 c\u1ee7a khu\u00f4n (v\u00e0 c\u00f4ng su\u1ea5t b\u01a1m ch\u00e2n kh\u00f4ng) kh\u00f4ng th\u1ec3 theo k\u1ecbp v\u1edbi vi\u1ec7c t\u1ea1o kh\u00ed nhanh ch\u00f3ng n\u00e0y, \u00e1p su\u1ea5t s\u1ebd t\u0103ng l\u00ean. Trong tr\u01b0\u1eddng h\u1ee3p t\u1ed3i t\u1ec7 nh\u1ea5t, kh\u00ed b\u1ecb m\u1eafc k\u1eb9t c\u00f3 th\u1ec3 g\u00e2y n\u1ed5i ho\u1eb7c v\u1ee1 c\u1ea5u tr\u00fac khu\u00f4n. Kh\u00f4ng \u0111\u1ee7 th\u00f4ng gi\u00f3 ho\u1eb7c c\u00f4ng su\u1ea5t b\u01a1m do \u0111\u00f3 c\u00f3 th\u1ec3 tr\u1ef1c ti\u1ebfp d\u1eabn \u0111\u1ebfn s\u1ef1 s\u1ee5p \u0111\u1ed5 v\u1ecf trong khi b\u1ecb ch\u00e1y.<\/p>\n

Trong th\u1ef1c t\u1ebf, m\u1ed9t khi b\u1ecdt \u0111\u01b0\u1ee3c ch\u00e1y, khu\u00f4n ch\u00e2n kh\u00f4ng th\u00f4ng th\u01b0\u1eddng (phim nh\u1ef1a che m\u1ed9t h\u1ed9p ch\u00e2n kh\u00f4ng) c\u00f3 xu h\u01b0\u1edbng th\u1ea5t b\u1ea1i. Phim th\u01b0\u1eddng ch\u00e1y qua xung quanh sprue ho\u1eb7c riser, g\u00e2y ra ch\u00e2n kh\u00f4ng gi\u1ea3m \u0111\u1ed9t ng\u1ed9t v\u00e0 t\u1ea1o ra m\u1ed9t s\u1ef1 m\u1ea5t c\u00e2n b\u1eb1ng \u00e1p su\u1ea5t l\u1edbn gi\u1eefa b\u00ean trong v\u00e0 b\u00ean ngo\u00e0i c\u1ee7a khu\u00f4n. S\u1ef1 gia t\u0103ng \u00e1p su\u1ea5t n\u00e0y c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng s\u1ee5p \u0111\u1ed5 v\u1ecf. M\u1ed9t ng\u01b0\u1eddi c\u00f3 th\u1ec3 c\u1ed1 g\u1eafng b\u00f9 \u0111\u1eafp b\u1eb1ng c\u00e1ch thi\u1ebft l\u1eadp m\u1ed9t ch\u00e2n kh\u00f4ng ban \u0111\u1ea7u r\u1ea5t cao (v\u00ed d\u1ee5 -0,07). \u202f MPa), nh\u01b0ng trong c\u00e1c th\u00ed nghi\u1ec7m \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng gi\u1edbi thi\u1ec7u c\u00e1c v\u1ea5n \u0111\u1ec1 m\u1edbi (v\u00ed d\u1ee5: \u0111\u1ed9 x\u1ed1p kh\u00ed) v\u00e0 kh\u00f3 ki\u1ec3m so\u00e1t. N\u00f3i t\u00f3m l\u1ea1i, ch\u1ec9 c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh ch\u00e2n kh\u00f4ng \u0111\u00e3 ch\u1ee9ng minh kh\u00f4ng \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 ng\u0103n ch\u1eb7n s\u1ef1 s\u1ee5p \u0111\u1ed5.<\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p \u0111\u00f3ng g\u00f3i m\u00f4 h\u00ecnh c\u1ea3i thi\u1ec7n<\/strong><\/h2>\n

\u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 s\u1ee5p \u0111\u1ed5, quy tr\u00ecnh \u0111\u00f3ng g\u00f3i m\u1eabu \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i \u0111\u1ec3 khu\u00f4n v\u1eabn \u0111\u01b0\u1ee3c ni\u00eam phong t\u1ed1t ngay c\u1ea3 sau khi b\u1ecdt ch\u00e1y ra. Trong ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n, c\u00e1c m\u1eabu c\u1eeda \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp \u0111\u1ec3 n\u1ed5i ra th\u00f4ng qua phim ni\u00eam phong v\u00e0 \u0111\u01b0\u1ee3c c\u1ee7ng c\u1ed1 b\u1eb1ng c\u00e1t d\u00ednh. C\u00e1c b\u01b0\u1edbc nh\u01b0 sau:<\/p>\n

M\u00f4 h\u00ecnh b\u1ecdt (m\u00f4 h\u00ecnh \u0111\u00fac) \u0111\u01b0\u1ee3c ch\u00f4n v\u00e0 n\u00e9n trong c\u00e1t kh\u00f4 nh\u01b0 tr\u01b0\u1edbc.<\/p>\n

C\u00e1c m\u1eabu sprue v\u00e0 riser \u0111\u01b0\u1ee3c \u0111\u1ecbnh v\u1ecb \u0111\u1ec3 \u0111\u1ec9nh c\u1ee7a h\u1ecd n\u1ed5i l\u00ean tr\u00ean b\u1ec1 m\u1eb7t h\u1ed9p c\u00e1t<\/strong>.<\/p>\n

Phim nh\u1ef1a \u0111\u01b0\u1ee3c \u0111\u1eb7t ph\u1eb3ng tr\u00ean h\u1ed9p c\u00e1t, v\u1edbi c\u00e1c m\u1eabu sprue v\u00e0 riser \u0111\u00e2m xuy\u00ean qua phim.<\/p>\n

M\u1ed9t nh\u1eabn c\u1ee7a k\u1ebft d\u00ednh (d\u00ednh) c\u00e1t<\/strong>\u00a0\u0111\u01b0\u1ee3c \u0111\u1eb7t xung quanh m\u1ed7i m\u1eabu sprue \/ riser n\u1ed5i l\u00ean tr\u00ean \u0111\u1ec9nh c\u1ee7a phim v\u00e0 tr\u00f2n m\u1ecbn. C\u1ed1c \u0111\u1ed5 sau \u0111\u00f3 \u0111\u01b0\u1ee3c l\u1eafp \u0111\u1eb7t tr\u00ean sprue.<\/p>\n

Cu\u1ed1i c\u00f9ng, h\u1ed9p ch\u00e2n kh\u00f4ng \u0111\u01b0\u1ee3c ni\u00eam phong v\u00e0 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y b\u01a1m ch\u00e2n kh\u00f4ng nh\u01b0 tr\u01b0\u1edbc.<\/p>\n

C\u1ea5u h\u00ecnh n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng khoang khu\u00f4n v\u1eabn \u0111\u01b0\u1ee3c ni\u00eam phong hi\u1ec7u qu\u1ea3 trong khi b\u1ecb ch\u00e1y v\u00e0 \u0111\u1ed5. V\u1edbi sprue v\u00e0 riser ph\u00e1 v\u1ee1 qua phim v\u00e0 li\u00ean k\u1ebft b\u1edfi c\u00e1t, \u00e1p su\u1ea5t b\u00ean trong v\u00e0 b\u00ean ngo\u00e0i khoang v\u1eabn c\u00e2n b\u1eb1ng, ngay c\u1ea3 sau khi b\u1ecdt \u0111\u01b0\u1ee3c ti\u00eau th\u1ee5. N\u00f3i c\u00e1ch kh\u00e1c, s\u1ef1 kh\u00e1c bi\u1ec7t \u00e1p su\u1ea5t kh\u00f4ng kh\u00ed tr\u00ean khu\u00f4n thay \u0111\u1ed5i r\u1ea5t \u00edt trong khi \u0111\u1ed5, v\u00ec v\u1eady vi\u1ec7c \u0111\u1ecdc m\u00e1y \u0111o ch\u00e2n kh\u00f4ng v\u1eabn ch\u00ednh x\u00e1c v\u00e0 \u1ed5n \u0111\u1ecbnh. H\u01a1n n\u1eefa, m\u1ed9t khi c\u00e1t li\u00ean k\u1ebft c\u1ee9ng, n\u00f3 gi\u1eef v\u1eefng m\u00e0ng ch\u1ed1ng l\u1ea1i b\u1ec1 m\u1eb7t m\u00f4 h\u00ecnh, ng\u0103n ch\u1eb7n \"ba r\u00f2 r\u1ec9\" (kh\u00f4ng kh\u00ed, c\u00e1t ho\u1eb7c kim lo\u1ea1i). Tr\u00ean th\u1ef1c t\u1ebf, khu\u00f4n b\u00e2y gi\u1edd h\u00e0nh vi nh\u01b0 m\u1ed9t v\u1ecf \u0111\u00f3ng: b\u1ecdt ch\u00e1y ra th\u00e0nh m\u1ed9t khoang nh\u1ecf, th\u00f4ng gi\u00f3 t\u1ed1t h\u01a1n l\u00e0 m\u1ed9t b\u00ecnh m\u1edf r\u1ed9ng. Trong th\u1ef1c t\u1ebf, \u0111\u00f3ng g\u00f3i c\u1ea3i thi\u1ec7n n\u00e0y g\u1ea7n nh\u01b0 lo\u1ea1i b\u1ecf s\u1ef1 s\u1ee5p \u0111\u1ed5 v\u1ecf v\u00e0 khuy\u1ebft t\u1eadt \u0111\u00fac.<\/p>\n

Ph\u1ea7n k\u1ebft lu\u1eadn<\/strong><\/h2>\n

\"M\u1ea5t<\/p>\n

T\u00f3m l\u1ea1i, \u0111\u00fac v\u1ecf b\u1ecdt m\u1ea5t l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u00fac ch\u00ednh x\u00e1c h\u1ee9a h\u1eb9n k\u1ebft h\u1ee3p \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a \u0111\u00fac \u0111\u1ea7u t\u01b0 v\u1edbi s\u1ef1 \u0111\u01a1n gi\u1ea3n v\u00e0 linh ho\u1ea1t c\u1ee7a c\u00e1c m\u1eabu b\u1ecdt m\u1ea5t. L\u1ee3i th\u1ebf ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 lo\u1ea1i b\u1ecf c\u00e1c khuy\u1ebft t\u1eadt carbon, t\u1ea1o ra \u0111\u00fac v\u01b0\u1ee3t tr\u1ed9i, trong khi th\u00e1ch th\u1ee9c ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 s\u1ee5p \u0111\u1ed5 khu\u00f4n d\u01b0\u1edbi ch\u00e2n kh\u00f4ng. K\u1ef9 thu\u1eadt \u0111\u00f3ng g\u00f3i \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n - c\u1ed5ng n\u1ed5i ra qua phim v\u00e0 t\u0103ng c\u01b0\u1eddng ch\u00fang b\u1eb1ng c\u00e1t d\u00ednh - \u1ed5n \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 \u00e1p su\u1ea5t khu\u00f4n trong khi b\u1ecb ch\u00e1y. S\u1ef1 \u0111\u1ed5i m\u1edbi n\u00e0y \"v\u01b0\u1ee3t qua nh\u1eefng thi\u1ebfu s\u00f3t ban \u0111\u1ea7u, lo\u1ea1i b\u1ecf s\u1ef1 s\u1ee5p \u0111\u1ed5 h\u1ed9p v\u00e0 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng \u0111\u00fac\". K\u1ebft qu\u1ea3 l\u00e0, quy tr\u00ecnh \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u00fac ch\u1ea5t l\u01b0\u1ee3ng cao \u0111\u00e1ng tin c\u1eady v\u1edbi t\u1ef7 l\u1ec7 ph\u1ebf li\u1ec7u gi\u1ea3m. S\u1ef1 tinh ch\u1ebf nh\u01b0 v\u1eady t\u0103ng c\u01b0\u1eddng \u0111\u00e1ng k\u1ec3 ti\u1ec7n \u00edch th\u1ef1c t\u1ebf c\u1ee7a \u0111\u00fac v\u1ecf b\u1ecdt b\u1ecb m\u1ea5t \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c b\u1ed9 ph\u1eadn ph\u1ee9c t\u1ea1p, t\u01b0\u1eddng m\u1ecfng v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ea5p \u0111\u1ed9 \u0111\u00fac \u0111\u1ea7u t\u01b0.<\/p>\n

C\u00f4ng ty TNHH C\u00f4ng ngh\u1ec7 H\u00e0ng Ch\u00e2u Ouchen <\/b><\/u><\/strong><\/a>l\u00e0 m\u1ed9t nh\u00e0 s\u1ea3n xu\u1ea5t h\u00e0ng \u0111\u1ea7u chuy\u00ean v\u1ec1 thi\u1ebft b\u1ecb ti\u00ean ti\u1ebfn cho ng\u00e0nh c\u00f4ng nghi\u1ec7p \u0111\u00fac b\u1ecdt b\u1ecb m\u1ea5t<\/b><\/u><\/strong><\/a>. H\u1ec7 th\u1ed1ng c\u1ee7a ch\u00fang t\u00f4i k\u1ebft h\u1ee3p t\u1ef1 \u0111\u1ed9ng h\u00f3a PLC ti\u00ean ti\u1ebfn, gi\u00e1m s\u00e1t t\u1eeb xa v\u00e0 kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng m\u00f4-\u0111un - l\u00e0m cho ch\u00fang l\u00fd t\u01b0\u1edfng cho qu\u00e1 tr\u00ecnh \u0111\u00fac v\u1ecf b\u1ecdt b\u1ecb m\u1ea5t \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 \u1edf tr\u00ean. Cho d\u00f9 b\u1ea1n’ re m\u1edf r\u1ed9ng cho s\u1ea3n xu\u1ea5t kh\u1ed1i l\u01b0\u1ee3ng cao ho\u1eb7c c\u1ea3i thi\u1ec7n t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a \u0111\u00fac ph\u1ee9c t\u1ea1p, c\u00e1c gi\u1ea3i ph\u00e1p t\u00edch h\u1ee3p c\u1ee7a ch\u00fang t\u00f4i lo\u1ea1i b\u1ecf c\u00e1c khi\u1ebfm khuy\u1ebft carbon v\u00e0 ng\u0103n ch\u1eb7n s\u1ef1 s\u1ee5p \u0111\u1ed5 khu\u00f4n v\u1edbi \u0111\u1ed9 tin c\u1eady v\u00f4 c\u00f9ng.<\/p>\n

S\u1eb5n s\u00e0ng n\u00e2ng c\u1ea5p Foundry c\u1ee7a b\u1ea1n?<\/strong>
\n\u0110\u1ed1i t\u00e1c v\u1edbi Ouchen \u0111\u1ec3 hi\u1ec7n \u0111\u1ea1i h\u00f3a ho\u1ea1t \u0111\u1ed9ng \u0111\u00fac c\u1ee7a b\u1ea1n. Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i ngay h\u00f4m nay<\/b><\/u><\/strong><\/a>\u00a0\u0111\u1ec3 t\u00ecm hi\u1ec3u c\u00e1ch thi\u1ebft b\u1ecb khu v\u1ef1c tr\u1eafng th\u00f4ng minh c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng s\u1ef1 \u1ed5n \u0111\u1ecbnh s\u1ea3n xu\u1ea5t c\u1ee7a b\u1ea1n, gi\u1ea3m thi\u1ec3u l\u1ed7i v\u00e0 gi\u1ea3m chi ph\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

Introduction to Lost Foam Shell Casting Method The lost-foam shell casting method is a hybrid of investment (shell) casting and lost-foam (vaporizing-pattern) casting. In this process, an expandable foam pattern (usually EPS) is coated with a high-temperature-resistant ceramic (refractory) coating and baked to form a rigid shell over the foam. The coated foam pattern is […]<\/p>\n","protected":false},"author":3,"featured_media":4401,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","jetpack_publicize_message":"Lost Foam Shell Casting Method\u00a0Shell Collapse: Causes and Analysis","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[160,161],"tags":[],"class_list":["post-4398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","category-news-blog"],"acf":[],"jetpack_publicize_connections":[],"_links":{"self":[{"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/posts\/4398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/comments?post=4398"}],"version-history":[{"count":1,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/posts\/4398\/revisions"}],"predecessor-version":[{"id":4403,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/posts\/4398\/revisions\/4403"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/media\/4401"}],"wp:attachment":[{"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/media?parent=4398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/categories?post=4398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oc-epc.com\/vi\/wp-json\/wp\/v2\/tags?post=4398"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}