Xin ch\u00e0o!<\/p>\n\n\n\n
C\u00f3 th\u1ec3 cho t\u00f4i bi\u1ebft gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p c\u1ee7a l\u00f2 xo n\u00e9n \u0111\u01b0\u1ee3c kh\u00f4ng?<\/p>\n\n\n\n
Ti\u00eau chu\u1ea9n JISB2704 c\u00f3 m\u1ed9t s\u01a1 \u0111\u1ed3 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1ecdc t\u1eeb \u0111\u00f3, nh\u01b0ng t\u00f4i ngh\u0129 \u0111\u00e2y ch\u1ec9 l\u00e0 gi\u00e1 tr\u1ecb g\u1ea7n \u0111\u00fang.<\/p>\n\n\n\n
C\u00f3 c\u00e1ch n\u00e0o kh\u00e1c \u0111\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p kh\u00f4ng? V\u00ed d\u1ee5, gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t cho ph\u00e9p s\u1ebd b\u1eb1ng bao nhi\u00eau ph\u1ea7n tr\u0103m \u0111\u1ed9 b\u1ec1n k\u00e9o? (T\u00f4i \u0111\u00e3 th\u1ea5y c\u00e1ch t\u00ednh n\u00e0y trong m\u1ed9t s\u1ed1 t\u00e0i li\u1ec7u)<\/p>\n\n\n\n
C\u00e1c v\u1eadt li\u1ec7u \u1edf \u0111\u00e2y l\u00e0 SUS316WPA v\u00e0 SUS304WBP.<\/p>\n\n\n\n
Bi\u1ec3u \u0111\u1ed3 gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p li\u1ec7t k\u00ea trong JISB2704 s\u1eed d\u1ee5ng gi\u00e1 tr\u1ecb thu \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch nh\u00e2n gi\u1edbi h\u1ea1n d\u01b0\u1edbi c\u1ee7a gi\u00e1 tr\u1ecb ti\u00eau chu\u1ea9n \u0111\u1ed9 b\u1ec1n k\u00e9o c\u1ee7a v\u1eadt li\u1ec7u v\u1edbi h\u1ec7 s\u1ed1 \u0111\u01b0\u1ee3c ch\u1ecdn c\u00f3 x\u00e9t \u0111\u1ebfn \u0111i\u1ec3m t\u1edbi h\u1ea1n cho t\u1eebng v\u1eadt li\u1ec7u. (Chi ti\u1ebft \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong ph\u1ea7n ch\u00fa th\u00edch JIS B 2704.)<\/p>\n\n\n\n
H\u1ec7 s\u1ed1 c\u1ee7a SUS316-WPA v\u00e0 SUS304-WPB l\u00e0 0,4, do \u0111\u00f3 gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p \u0111\u1ed1i v\u1edbi SUS316-WPA v\u00e0 SUS304-WPB ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng \u0111\u1ed9 b\u1ec1n k\u00e9o c\u1ee7a v\u1eadt li\u1ec7u (gi\u1edbi h\u1ea1n d\u01b0\u1edbi c\u1ee7a gi\u00e1 tr\u1ecb ti\u00eau chu\u1ea9n) x 0,4<\/p>\n\n\n\n
T\u00f4i mu\u1ed1n h\u1ecfi th\u00eam nh\u01b0 sau: V\u00ed d\u1ee5, theo JIS B 2704, trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a SUS316WPA, \u0111\u1ed9 b\u1ec1n k\u00e9o l\u00e0 1400N\/mm2 x 0,4 = 560N\/mm2. N\u1ebfu nh\u00e2n s\u1ed1 \u0111\u00f3 v\u1edbi 0,8, n\u00f3 s\u1ebd b\u1eb1ng 448N\/mm2, nh\u01b0ng khi t\u00f4i t\u00ednh to\u00e1n b\u1eb1ng ph\u1ea7n m\u1ec1m \u0111\u00e1nh gi\u00e1 l\u00f2 xo c\u1ee7a Tokai Spring, gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t cho ph\u00e9p \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb l\u00e0 478N\/mm2.<\/p>\n\n\n\n
T\u1ea1i sao l\u1ea1i c\u00f3 l\u1ed7i n\u00e0y? Khi nghi\u00ean c\u1ee9u th\u00eam, t\u00f4i t\u00ecm th\u1ea5y th\u00f4ng tin r\u1eb1ng n\u00f3 n\u00ean \u0111\u01b0\u1ee3c xem x\u00e9t \u1edf m\u1ee9c 45% \u0111\u1ed9 b\u1ec1n k\u00e9o. Tr\u01b0\u1edbc \u0111\u00e2y gi\u00e1 tr\u1ecb n\u00e0y c\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng kh\u00f4ng?<\/p>\n\n\n\n
Xin ch\u00e0o! V\u1ec1 c\u00e2u h\u1ecfi c\u1ee7a b\u1ea1n, trong tr\u01b0\u1eddng h\u1ee3p c\u1ee7a ch\u00fang t\u00f4i, \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p = \u0111\u1ed9 b\u1ec1n k\u00e9o x 0,45.Ngo\u00e0i ra, trong JIS, nh\u01b0 b\u1ea1n \u0111\u00e3 ch\u1ec9 ra, h\u1ec7 s\u1ed1 tr\u01b0\u1edbc \u0111\u00e2y \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf m\u1ee9c 0,45. Tuy nhi\u00ean hi\u1ec7n t\u1ea1i h\u1ec7 s\u1ed1 n\u00e0y l\u00e0 0,4.<\/p>\n\n\n\n
Trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p, xin l\u01b0u \u00fd r\u1eb1ng \u1ee9ng su\u1ea5t t\u1ed1i \u0111a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1eef d\u01b0\u1edbi gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t cho ph\u00e9p l\u00e0 0,8!<\/p>\n\n\n\n
T\u00f4i \u0111ang nghi\u00ean c\u1ee9u v\u1ec1 l\u00f2 xo v\u00e0 t\u00ecnh c\u1edd th\u1ea5y trang n\u00e0y.<\/p>\n\n\n\n
R\u1ea5t nhi\u1ec1u \u0111i\u1ec1u tr\u1edf n\u00ean r\u1ea5t r\u00f5 r\u00e0ng sau khi \u0111\u1ecdc th\u00f4ng tin t\u1ea1i \u0111\u00e2y.<\/p>\n\n\n\n
Tuy nhi\u00ean, t\u00f4i c\u00f3 1 s\u1ed1 c\u00e2u h\u1ecfi nh\u01b0 sau:<\/p>\n\n\n\n
1. C\u00f3 n\u00ean s\u1eed d\u1ee5ng gi\u00e1 tr\u1ecb \u0111\u1ecdc \u0111\u01b0\u1ee3c t\u1eeb \u0111\u01b0\u1eddng cong \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p kh\u00f4ng hay n\u00ean s\u1eed d\u1ee5ng \u201c\u1ee8ng su\u1ea5t xo\u1eafn \u1edf t\u1ea3i tr\u1ecdng th\u1eed l\u1edbn nh\u1ea5t\u201d nh\u01b0 trong ph\u1ea7n \u201cKi\u1ec3m tra \u0111\u1eb7c t\u00ednh l\u00f2 xo\u201d \u1edf ph\u1ea7n \u201cKi\u1ec3m tra\u201d c\u1ee7a JISB2704?2.<\/p>\n\n\n\n
JIS n\u00eau r\u1eb1ng “Vi\u1ec7c s\u1eed d\u1ee5ng ph\u1ea3i \u1edf m\u1ee9c 80% ho\u1eb7c \u00edt h\u01a1n m\u1ee9c \u1ee9ng su\u1ea5t cho ph\u00e9p.” \u201c\u1ee8ng su\u1ea5t cho ph\u00e9p\u201d \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1ch nh\u00e2n \u0111\u1ed9 b\u1ec1n k\u00e9o v\u1edbi h\u1ec7 s\u1ed1 an to\u00e0n, nh\u01b0ng t\u1ea1i sao \u201c\u1ee9ng su\u1ea5t cho ph\u00e9p\u201d l\u1ea1i nh\u00e2n v\u1edbi h\u1ec7 s\u1ed1 an to\u00e0n l\u00e0 80%?<\/p>\n\n\n\n
Ch\u00fang t\u00f4i xin tr\u1ea3 l\u1eddi hai c\u00e2u h\u1ecfi c\u1ee7a b\u1ea1n nh\u01b0 sau.<\/p>\n\n\n\n
1.\u27a1”\u1ee8ng su\u1ea5t xo\u1eafn \u1edf t\u1ea3i tr\u1ecdng th\u1eed l\u1edbn nh\u1ea5t” \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong JIS B 2704 bi\u1ec3u th\u1ecb \u1ee9ng su\u1ea5t t\u1ed1i \u0111a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng (\u03c40max) v\u00e0 \u0111\u01b0\u1eddng cong \u1ee9ng su\u1ea5t xo\u1eafn cho ph\u00e9p bi\u1ec3u th\u1ecb \u1ee9ng su\u1ea5t c\u00e0i \u0111\u1eb7t (\u03c40s). V\u00ec v\u1eady, khi xem x\u00e9t ph\u1ea1m vi s\u1eed d\u1ee5ng c\u1ee7a l\u00f2 xo, b\u1ea1n n\u00ean xem x\u00e9t “\u1ee8ng su\u1ea5t xo\u1eafn \u1edf t\u1ea3i tr\u1ecdng th\u1eed l\u1edbn nh\u1ea5t” n\u00e0y.2.<\/p>\n\n\n\n
\u27a1\u0110\u00f3 l\u00e0 b\u1edfi v\u00ec \u1ee9ng su\u1ea5t l\u1edbn nh\u1ea5t khi s\u1eed d\u1ee5ng \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n.\u0110\u1ea7u ti\u00ean, \u1ee9ng su\u1ea5t c\u00e0i \u0111\u1eb7t (\u03c40s) \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng “\u0111\u1ed9 b\u1ec1n k\u00e9o (\u03c3B) x h\u1ec7 s\u1ed1”. H\u1ec7 s\u1ed1 n\u00e0y t\u00ednh \u0111\u1ebfn t\u1ef7 l\u1ec7 gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean gi\u1edbi h\u1ea1n b\u1ec1n v\u00e0 theo JIS B 2704, d\u00e2y th\u00e9p piano = 0,5, d\u00e2y t\u00f4i d\u1ea7u = 0,55 v\u00e0 d\u00e2y th\u00e9p kh\u00f4ng g\u1ec9 = 0,4.Khi \u0111\u00f3, \u1ee9ng su\u1ea5t v\u1eadn h\u00e0nh t\u1ed1i \u0111a (\u03c40max) \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng \u201c\u0111\u1ed9 b\u1ec1n k\u00e9o (\u03c3B) x h\u1ec7 s\u1ed1 x 0,8 (80%)\u201d. V\u00f9ng g\u1ea7n \u1ee9ng su\u1ea5t c\u00e0i \u0111\u1eb7t kh\u00f4ng an to\u00e0n khi s\u1eed d\u1ee5ng v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng cao khi\u1ebfn l\u00f2 xo b\u1ecb ch\u00f9ng, do \u0111\u00f3 c\u1ea7n \u0111\u1eb7t \u1ee9ng su\u1ea5t th\u1eadm ch\u00ed c\u00f2n th\u1ea5p h\u01a1n \u1ee9ng su\u1ea5t c\u00e0i \u0111\u1eb7t t\u00ednh theo c\u00f4ng th\u1ee9c tr\u00ean.<\/p>\n","protected":false},"featured_media":0,"template":"","acf":[],"_links":{"self":[{"href":"https:\/\/www.tokaibane.com\/en\/wp-json\/wp\/v2\/cau-hoi\/43419"}],"collection":[{"href":"https:\/\/www.tokaibane.com\/en\/wp-json\/wp\/v2\/cau-hoi"}],"about":[{"href":"https:\/\/www.tokaibane.com\/en\/wp-json\/wp\/v2\/types\/cau-hoi"}],"wp:attachment":[{"href":"https:\/\/www.tokaibane.com\/en\/wp-json\/wp\/v2\/media?parent=43419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}