{"id":1397,"date":"2020-04-26T13:28:47","date_gmt":"2020-04-26T13:28:47","guid":{"rendered":"http:\/\/trangdoan.vn\/kythuatkimhoan\/?p=1397"},"modified":"2021-09-07T09:08:48","modified_gmt":"2021-09-07T09:08:48","slug":"phan-tich-khuyet-diem-mat-cat-cua-khoi-3d","status":"publish","type":"post","link":"https:\/\/trangdoan.vn\/kythuatkimhoan\/phan-tich-khuyet-diem-mat-cat-cua-khoi-3d\/","title":{"rendered":"PH\u00c2N T\u00cdCH KHUY\u1ebeT \u0110I\u1ec2M M\u1eb6T C\u1eaeT C\u1ee6A KH\u1ed0I 3D"},"content":{"rendered":"

Vi\u1ebft b\u1edfi Darla Alvarez<\/em><\/span><\/p>\n

B\u00e0i vi\u1ebft n\u00e0y ph\u00e2n t\u00edch khuy\u1ebft \u0111i\u1ec3m c\u1ee7a kh\u1ed1i 3D d\u00f9ng cho s\u1ea3n xu\u1ea5t. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1eb7t c\u1eaft ngang \u0111\u01b0\u1ee3c vi\u1ebft b\u1edfi Darla Alvarez, Gi\u1ea3ng vi\u00ean thi\u1ebft k\u1ebf v\u00e0 c\u00f4ng ngh\u1ec7 trang s\u1ee9c GIA.<\/em><\/span><\/p>\n

M\u1ed9t trong nh\u1eefng l\u1ee3i th\u1ebf c\u00f3 th\u1ec3 b\u1ecb b\u1ecf qua c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m thi\u1ebft k\u1ebf n\u1eef trang. \u0110\u00f3 l\u00e0 kh\u1ea3 n\u0103ng ki\u1ec3m tra c\u00e1c kh\u1ed1i m\u00f4 h\u00ecnh 3D. Ch\u00fang gi\u00fap gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 trong s\u1ea3n xu\u1ea5t tr\u01b0\u1edbc khi ti\u1ebfn h\u00e0nh c\u00f4ng vi\u1ec7c t\u1ea1o m\u1eabu. B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch m\u1ed9t m\u00f4 h\u00ecnh tr\u01b0\u1edbc khi in ho\u1eb7c phay 3-D. Nhi\u1ec1u l\u1ed7i kh\u00e1c nhau c\u00f3 th\u1ec3 s\u1ebd \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y v\u00e0 kh\u1eafc ph\u1ee5c tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng b\u1ea5t h\u00ecnh th\u1ee9c t\u1ea1o m\u1eabu s\u00e1p n\u00e0o. C\u00e1ch t\u1ed1t nh\u1ea5t \u0111\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c n\u00e0y l\u00e0 s\u1eed d\u1ee5ng l\u1ec7nh \u201cClipping Plane\u201d. N\u00f3 c\u00f3 t\u00e1c d\u1ee5ng t\u1ea1o ra m\u1ed9t v\u00f9ng nh\u00ecn m\u1eb7t c\u1eaft ngang, b\u00ean trong c\u1ee7a kh\u1ed1i. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t h\u00ecnh \u1ea3nh tr\u1ef1c quan tr\u00ean m\u00e1y t\u00ednh. Vi\u1ec7c n\u00e0y cho ph\u00e9p \u0111\u00e1nh gi\u00e1 v\u00e0 \u0111o l\u01b0\u1eddng t\u00ednh \u1ee9ng d\u1ee5ng c\u1ee7a thi\u1ebft k\u1ebf.<\/span><\/p>\n

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M\u1eb7t ph\u1eb3ng c\u1eaft ngang \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u1ea1o ra trong l\u00f2ng c\u1ee7a kh\u1ed1i. N\u00f3 \u0111\u1ea1i di\u00ean cho m\u1ed9t m\u1eb7t c\u1eaft kh\u00f4ng gi\u1edbi h\u1ea1n v\u00f9ng nh\u00ecn, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1eaft kh\u1ed1i. V\u00e0 cung c\u1ea5p cho ng\u01b0\u1eddi d\u00f9ng kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb nh\u1eefng g\u00f3c khu\u1ea5t b\u00ean trong c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 c\u1eaft \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ea1i \u0111i\u1ec3m v\u1ecb tr\u00ed t\u1ea1o \u201cClipping plane\u201d. Thao t\u00e1c n\u00e0y gi\u1ed1ng nh\u01b0 c\u1eaft xuy\u00ean qua m\u1ed9t v\u1eadt b\u1eb1ng dao v\u00e0 c\u00f3 th\u1ec3 nh\u00ecn v\u00e0o b\u00ean trong. \u0110\u00e2y l\u00e0 minh h\u1ecda v\u00f9ng nh\u00ecn b\u00ean trong c\u1ee7a m\u1ed9t m\u00f4 h\u00ecnh. M\u1eb7t c\u1eaft \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec3 h\u1ed7 tr\u1ee3 cho ph\u00e2n t\u00edch nh\u01b0 sau:<\/span><\/p>\n

C\u00e1ch ki\u1ec3m tra t\u1ed1t nh\u1ea5t ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n xu\u1ea5t c\u1ee7a m\u1ed9t m\u00f4 h\u00ecnh l\u00e0 t\u00ecm ki\u1ebfm b\u1ea5t k\u1ef3 v\u1ecb tr\u00ed n\u00e0o c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c v\u1ea5n \u0111\u1ec1 cho \u0111\u00fac. \u0110\u1eb7t m\u1eb7t ph\u1eb3ng c\u1eaft t\u1ea1i t\u00e2m tr\u00ean tr\u1ee5c X, song song v\u1edbi v\u00f9ng nh\u00ecn m\u1eb7t x\u1ecf ng\u00f3n (through finger).<\/span><\/h3>\n

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Trong h\u00ecnh minh h\u1ecda, m\u1eb7t ph\u1eb3ng c\u1eaft l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt \u201cX\u201d xuy\u00ean qua n\u00f3, chia \u0111\u00f4i m\u00f4 h\u00ecnh. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, b\u1ea1n s\u1ebd nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c c\u00e1c g\u00f3c nh\u00ecn khu\u1ea5t b\u00ean trong chi\u1ebfc nh\u1eabn. Th\u1ef1c ra, t\u1ea1o c\u00e1c v\u00e1ch m\u1ecfng, s\u1eafc n\u00e9t c\u00f3 th\u1ec3 r\u1ea5t t\u1ed1t cho vi\u1ec7c \u0111\u00fac. Nh\u01b0ng t\u1ea1i v\u1ecb tr\u00ed m\u1ecfng, m\u00e0 t\u00f4i \u0111\u00e3 \u0111\u00e1nh d\u1ea5u b\u1eb1ng m\u0169i t\u00ean, s\u1ebd ch\u1ee9a \u0111\u1ea7y th\u1ea1ch cao. Do kho\u1ea3n th\u1ea1ch cao \u0111\u00f3 m\u1ecfng, n\u00f3 c\u00f3 th\u1ec3 v\u1ee1 ra khi kim lo\u1ea1i \u0111i v\u00e0o khu\u00f4n trong c\u00f4ng \u0111o\u1ea1n \u0111\u00fac. Ch\u00fang tr\u1ed9n l\u1eabn v\u1edbi kim lo\u1ea1i n\u00f3ng ch\u1ea3y, cu\u1ed1i c\u00f9ng t\u1ea1o ra c\u00e1c l\u1ed7 r\u1ed7ng (l\u1ed7i \u0111\u00fac) b\u00ean trong nh\u1eabn. \u0110i\u1ec1u ch\u1ec9nh l\u1ed7i n\u00e0y b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf g\u00f3c nh\u1ecdn s\u1ebd kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c v\u1ea5n \u0111\u1ec1.<\/span><\/p>\n

\u1ee8ng d\u1ee5ng kh\u00e1c c\u1ee7a m\u1eb7t ph\u1eb3ng c\u1eaft l\u00e0 \u0111\u1ec3 ki\u1ec3m tra c\u00e1ch c\u00e1c m\u00f4 h\u00ecnh c\u00f3 nhi\u1ec1u m\u1ea3nh kh\u1edbp v\u1edbi nhau.<\/span><\/h3>\n

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Trong v\u00ed d\u1ee5 n\u00e0y, m\u1ed9t ng\u00e0m c\u00f3 m\u1eb7t c\u1eaft h\u00ecnh c\u1ea7u v\u00e0 khe g\u00e0i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Ch\u00fang d\u00f9ng cho vi\u1ec7c l\u1eafp r\u00e1p d\u1ec5 d\u00e0ng h\u01a1n sau khi \u0111\u00fac. \u0110\u1eb7t m\u1eb7t ph\u1eb3ng c\u1eaft vu\u00f4ng g\u00f3c v\u1edbi nh\u1eabn cho th\u1ea5y v\u1ea5n \u0111\u1ec1 t\u1ea1i v\u1ecb tr\u00ed ng\u00e0m nh\u01b0 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. M\u1eb7c d\u00f9 ch\u00fang kh\u1edbp v\u1edbi nhau trong CAD (b\u1ea3ng v\u1ebd 3D). Tuy nhi\u00ean khi thanh ng\u00e0m khi \u0111\u01b0\u1ee3c l\u1ea5y ra ngo\u00e0i s\u1ebd kh\u00f4ng g\u00e0i l\u1ea1i \u0111\u01b0\u1ee3c v\u00e0o khe t\u01b0\u01a1ng \u1ee9ng. Do \u0111\u1ed9 r\u1ed9ng tr\u00ean khe h\u1eb9p h\u01a1n \u0111\u1ed9 r\u1ed9ng thanh ng\u00e0m. Ch\u00fa \u00fd t\u1ea1i v\u1ecb tr\u00ed to nh\u1ea5t c\u1ee7a h\u00ecnh c\u1ea7u, khi n\u00f3 \u0111\u01b0\u1ee3c g\u00e0i t\u1eeb tr\u00ean xu\u1ed1ng. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, c\u00e1c ch\u1ed1t ho\u1eb7c \u0111inh g\u00e0i th\u1eb3ng c\u00f3 th\u1ec3 s\u1ebd ph\u00f9 h\u1ee3p h\u01a1n.<\/span><\/p>\n

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Ngo\u00e0i ra, c\u00e1c m\u1ea3ng c\u1eaft kh\u00e1c c\u0169ng n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i c\u00e1c v\u1ecb tr\u00ed l\u1eafp r\u00e1p \u0111\u1ec3 ki\u1ec3m so\u00e1t t\u1ed1t h\u01a1n k\u00edch th\u01b0\u1edbc, \u0111\u1ed9 d\u00e0y m\u1ecfng. Trong nh\u1eabn n\u00e0y, \u0111\u1ed9 d\u00e0y b\u1ec7 \u0111\u00e1 ch\u1ec9 0,37mm v\u00e0 c\u1ea7n d\u00e0y h\u01a1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac trong c\u1ea3 \u0111\u00fac v\u00e0 l\u1eafp r\u00e1p.<\/span><\/p>\n

CAD c\u00f3 s\u1eed d\u1ee5ng \u0111\u00e1 \u1ea3o tr\u00ean m\u00e1y t\u00ednh. Do \u0111\u00f3 m\u1eb7t ph\u1eb3ng c\u1eaft c\u0169ng r\u1ea5t h\u1eefu \u00edch \u0111\u1ec3 xem x\u00e9t kho\u1ea3ng h\u1edf gi\u1eefa c\u00e1c vi\u00ean \u0111\u00e1. V\u00e0 gi\u00fap \u00edt cho vi\u1ec7c t\u00ednh to\u00e1n cho nh\u1eadn h\u1ed9t tr\u01b0\u1edbc khi c\u00f4ng vi\u1ec7c nh\u1eadn h\u1ed9t trong gia c\u00f4ng th\u1ef1c s\u1ef1 b\u1eaft \u0111\u1ea7u.<\/span><\/h3>\n

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Theo h\u00ecnh tr\u00ean, c\u00e1c vi\u00ean \u0111\u00e1 nh\u1eadn l\u00f9a trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y khi \u0111\u01b0\u1ee3c xem m\u1eb7t c\u1eaft ngang. Ch\u00fang r\u1ea5t s\u00e1t nhau v\u1edbi r\u1ea5t nhi\u1ec1u kim lo\u1ea1i \u0103n s\u00e2u v\u00e0o c\u00e1c vi\u00ean \u0111\u00e1. C\u00e1c vi\u00ean \u0111\u00e1 n\u00ean c\u00e1ch xa nhau s\u1ebd t\u1ed1t h\u01a1n. Cho ph\u00e9p \u0111\u1ed9 sai s\u1ed1 t\u1ef1 nhi\u00ean v\u1ec1 k\u00edch th\u01b0\u1edbc \u0111\u00e1 v\u00e0 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u00eanh \u0111\u1ee7 d\u00e0i cho th\u1ee3 nh\u1eadn h\u1ed9t sau n\u00e0y. Ngo\u00e0i ra, k\u00eanh qu\u00e1 h\u1eb9p cho c\u00e1c vi\u00ean \u0111\u00e1 s\u1ebd \u0111\u01b0\u1ee3c nh\u1eadn, nh\u01b0 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb b\u1eb1ng c\u00e1c m\u0169i t\u00ean. C\u00f3 qu\u00e1 nhi\u1ec1u kim lo\u1ea1i s\u1ebd ph\u1ea3i \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf khi nh\u1eadn h\u1ed9t, \u0111i\u1ec1u n\u00e0y v\u1eeba l\u00e3ng ph\u00ed v\u00e0 t\u1ed1n th\u1eddi gian.<\/span><\/p>\n

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Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y kh\u00f4ng h\u1eb3n l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 ph\u00e2n t\u00edch m\u1ed9t m\u00f4 h\u00ecnh cho kh\u1ea3 n\u0103ng s\u1ea3n xu\u1ea5t hi\u1ec7u qu\u1ea3. Nh\u01b0ng s\u1ebd \u1ee9ng d\u1ee5ng t\u1ed1t cho vi\u1ec7c ki\u1ec3m tra c\u00e1c v\u1ea5n \u0111\u1ec1 \u0111\u00fac, l\u1eafp r\u00e1p v\u00e0 nh\u1eadn h\u1ed9t. L\u00e0 ba c\u00f4ng \u0111o\u1ea1n l\u1edbn c\u1ee7a s\u1ea3n xu\u1ea5t, n\u00f3 s\u1ebd c\u1ea5u th\u00e0nh m\u00e2u thu\u1eabn gi\u1eefa thi\u1ebft k\u1ebf \u2013 th\u1ef1c t\u1ebf v\u00e0 va ch\u1ea1m theo nh\u1eefng c\u00e1ch kh\u00f4ng mong mu\u1ed1n. C\u00e1c c\u00f4ng c\u1ee5 CAD kh\u00f4ng ch\u1ec9 d\u00f9ng \u0111\u1ec3 t\u1ea1o ra s\u1ea3n ph\u1ea9m ngh\u1ec7 thu\u1eadt mang t\u00ednh th\u1ef1c ti\u1ec5n cao, m\u00e0 c\u00f2n c\u00f3 th\u1ec3 d\u00f9ng v\u00e0o vi\u1ec7c ki\u1ec3m so\u00e1t c\u00e1c l\u1ed7i tr\u00ean b\u1ea3n v\u1ebd tr\u01b0\u1edbc khi \u0111\u01b0a v\u00e0o gia c\u00f4ng.<\/span><\/p>\n

Ngu\u1ed3n: Ganoksin<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Vi\u1ebft b\u1edfi Darla Alvarez B\u00e0i vi\u1ebft n\u00e0y ph\u00e2n t\u00edch khuy\u1ebft \u0111i\u1ec3m c\u1ee7a kh\u1ed1i 3D d\u00f9ng cho s\u1ea3n xu\u1ea5t. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1eb7t c\u1eaft ngang \u0111\u01b0\u1ee3c vi\u1ebft b\u1edfi Darla Alvarez, Gi\u1ea3ng vi\u00ean thi\u1ebft k\u1ebf v\u00e0 c\u00f4ng ngh\u1ec7 trang s\u1ee9c GIA….<\/p>\n","protected":false},"author":3,"featured_media":1922,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[63,69],"tags":[],"yst_prominent_words":[],"class_list":["post-1397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kien-thuc","category-ky-nang-thiet-ke"],"_links":{"self":[{"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/posts\/1397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/comments?post=1397"}],"version-history":[{"count":13,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/posts\/1397\/revisions"}],"predecessor-version":[{"id":3883,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/posts\/1397\/revisions\/3883"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/media\/1922"}],"wp:attachment":[{"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/media?parent=1397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/categories?post=1397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/tags?post=1397"},{"taxonomy":"yst_prominent_words","embeddable":true,"href":"https:\/\/trangdoan.vn\/kythuatkimhoan\/wp-json\/wp\/v2\/yst_prominent_words?post=1397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}