Ti\u00eau chu\u1ea9n GB\/T 5280-2002 quy \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc ren v\u00e0 ki\u1ec3u \u0111\u1ea7u v\u00edt cho v\u00edt t\u1ef1 ren (v\u00edt d\u00f9ng cho t\u1ea5m kim lo\u1ea1i) v\u1edbi k\u00edch th\u01b0\u1edbc ren t\u1eeb ST1.5 \u0111\u1ebfn ST9.5. Ti\u00eau chu\u1ea9n n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh \u0111\u1ed3ng nh\u1ea5t trong s\u1ea3n xu\u1ea5t, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c si\u1ebft ch\u1eb7t \u0111\u00e1ng tin c\u1eady trong c\u00e1c v\u1eadt li\u1ec7u nh\u01b0 t\u1ea5m kim lo\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n khoan l\u1ed7 tr\u01b0\u1edbc.<\/p>\n
L\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o quan tr\u1ecdng trong l\u0129nh v\u1ef1c l\u1eafp gh\u00e9p c\u01a1 kh\u00ed, ti\u00eau chu\u1ea9n n\u00e0y quy \u0111\u1ecbnh c\u00e1c th\u00f4ng s\u1ed1 nh\u01b0 b\u01b0\u1edbc ren, \u0111\u01b0\u1eddng k\u00ednh l\u1edbn v\u00e0 nh\u1ecf, v\u00e0 chi\u1ec1u d\u00e0i ren cho c\u00e1c lo\u1ea1i C, F v\u00e0 R, th\u00fac \u0111\u1ea9y kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch v\u00e0 hi\u1ec7u su\u1ea5t trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p bao g\u1ed3m \u00f4 t\u00f4, \u0111i\u1ec7n t\u1eed v\u00e0 x\u00e2y d\u1ef1ng. Ti\u00eau chu\u1ea9n n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c th\u00f4ng l\u1ec7 qu\u1ed1c t\u1ebf \u0111\u1ed3ng th\u1eddi \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a ti\u00eau chu\u1ea9n Trung Qu\u1ed1c.<\/p>\n
Ti\u00eau chu\u1ea9n n\u00e0y quy \u0111\u1ecbnh h\u00ecnh d\u1ea1ng ren, bao g\u1ed3m \u0111\u01b0\u1eddng k\u00ednh ngo\u00e0i (d1), \u0111\u01b0\u1eddng k\u00ednh b\u01b0\u1edbc ren (d2), \u0111\u01b0\u1eddng k\u00ednh trong (d3), g\u00f3c v\u00e1t (c), b\u00e1n k\u00ednh (r) v\u00e0 chi\u1ec1u d\u00e0i tham chi\u1ebfu (y) cho c\u00e1c lo\u1ea1i \u0111\u1ea7u ren kh\u00e1c nhau. Nh\u1eefng th\u00f4ng s\u1ed1 n\u00e0y \u0111\u1ea3m b\u1ea3o s\u1ef1 h\u00ecnh th\u00e0nh v\u00e0 \u0103n kh\u1edbp ren ch\u00ednh x\u00e1c, gi\u1ea3m thi\u1ec3u h\u01b0 h\u1ea1i v\u1eadt li\u1ec7u trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t.<\/p>\n
C\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh bao g\u1ed3m b\u01b0\u1edbc ren thay \u0111\u1ed5i t\u1eeb 0,5 mm cho ST1.5 \u0111\u1ebfn 2,1 mm cho c\u00e1c k\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n, v\u1edbi dung sai cho c\u00e1c gi\u00e1 tr\u1ecb t\u1ed1i \u0111a\/t\u1ed1i thi\u1ec3u \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c sai l\u1ec7ch trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t. Lo\u1ea1i C d\u00e0nh cho \u0111\u1ea7u nh\u1ecdn, F d\u00e0nh cho \u0111\u1ea7u t\u00f9 v\u00e0 R d\u00e0nh cho \u0111\u1ea7u tr\u00f2n, m\u1ed7i lo\u1ea1i ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ed9 d\u00e0y v\u1eadt li\u1ec7u c\u1ee5 th\u1ec3.<\/p>\n
D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng k\u00edch th\u01b0\u1edbc ren \u0111\u1ea7y \u0111\u1ee7 theo ti\u00eau chu\u1ea9n GB\/T 5280-2002, cung c\u1ea5p c\u00e1c gi\u00e1 tr\u1ecb ch\u00ednh x\u00e1c \u0111\u1ec3 tham kh\u1ea3o trong thi\u1ebft k\u1ebf. S\u1eed d\u1ee5ng b\u1ea3ng n\u00e0y \u0111\u1ec3 ki\u1ec3m ch\u1ee9ng thi\u1ebft k\u1ebf v\u00e0 l\u1eadp th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt s\u1ea3n xu\u1ea5t.<\/p>\n
| Tham s\u1ed1<\/th>\n | ST1.5<\/th>\n | ST1.9<\/th>\n | ST2.2<\/th>\n | ST2.6<\/th>\n | ST2.9<\/th>\n | ST3.3<\/th>\n | ST3.5<\/th>\n | ST3.9<\/th>\n | ST4.2<\/th>\n | ST4.8<\/th>\n | ST5.5<\/th>\n | ST6.3<\/th>\n | ST8<\/th>\n | ST9.5<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S\u00e2n b\u00f3ng \u0111\u00e1<\/td>\n | 0.5<\/td>\n | 0.6<\/td>\n | 0.8<\/td>\n | 0.9<\/td>\n | 1.1<\/td>\n | 1.3<\/td>\n | 1.3<\/td>\n | 1.3<\/td>\n | 1.4<\/td>\n | 1.6<\/td>\n | 1.8<\/td>\n | 1.8<\/td>\n | 2.1<\/td>\n | 2.1<\/td>\n<\/tr>\n |
| d1 t\u1ed1i \u0111a<\/td>\n | 1.52<\/td>\n | 1.9<\/td>\n | 2.24<\/td>\n | 2.57<\/td>\n | 2.9<\/td>\n | 3.3<\/td>\n | 3.53<\/td>\n | 3.91<\/td>\n | 4.22<\/td>\n | 4.8<\/td>\n | 5.46<\/td>\n | 6.25<\/td>\n | 8<\/td>\n | 9.65<\/td>\n<\/tr>\n |
| d1 ph\u00fat<\/td>\n | 1.38<\/td>\n | 1.76<\/td>\n | 2.1<\/td>\n | 2.43<\/td>\n | 2.76<\/td>\n | 3.12<\/td>\n | 3.35<\/td>\n | 3.73<\/td>\n | 4.04<\/td>\n | 4.62<\/td>\n | 5.28<\/td>\n | 6.03<\/td>\n | 7.78<\/td>\n | 9.43<\/td>\n<\/tr>\n |
| d2 t\u1ed1i \u0111a<\/td>\n | 0.91<\/td>\n | 1.24<\/td>\n | 1.63<\/td>\n | 1.9<\/td>\n | 2.18<\/td>\n | 2.39<\/td>\n | 2.64<\/td>\n | 2.92<\/td>\n | 3.1<\/td>\n | 3.58<\/td>\n | 4.17<\/td>\n | 4.88<\/td>\n | 6.2<\/td>\n | 7.85<\/td>\n<\/tr>\n |
| d2 ph\u00fat<\/td>\n | 0.84<\/td>\n | 1.17<\/td>\n | 1.52<\/td>\n | 1.8<\/td>\n | 2.08<\/td>\n | 2.29<\/td>\n | 2.51<\/td>\n | 2.77<\/td>\n | 2.95<\/td>\n | 3.43<\/td>\n | 3.99<\/td>\n | 4.7<\/td>\n | 5.99<\/td>\n | 7.59<\/td>\n<\/tr>\n |
| d3 t\u1ed1i \u0111a<\/td>\n | 0.79<\/td>\n | 1.12<\/td>\n | 1.47<\/td>\n | 1.73<\/td>\n | 2.01<\/td>\n | 2.21<\/td>\n | 2.41<\/td>\n | 2.67<\/td>\n | 2.84<\/td>\n | 3.3<\/td>\n | 3.86<\/td>\n | 4.55<\/td>\n | 5.84<\/td>\n | 7.44<\/td>\n<\/tr>\n |
| d3 ph\u00fat<\/td>\n | 0.69<\/td>\n | 1.02<\/td>\n | 1.37<\/td>\n | 1.6<\/td>\n | 1.88<\/td>\n | 2.08<\/td>\n | 2.26<\/td>\n | 2.51<\/td>\n | 2.69<\/td>\n | 3.12<\/td>\n | 3.68<\/td>\n | 4.34<\/td>\n | 5.64<\/td>\n | 7.24<\/td>\n<\/tr>\n |
| c t\u1ed1i \u0111a<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n<\/tr>\n |
| r \u2248<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | 0.5<\/td>\n | 0.6<\/td>\n | 0.6<\/td>\n | 0.7<\/td>\n | 0.8<\/td>\n | 0.9<\/td>\n | 1.1<\/td>\n | 1.4<\/td>\n<\/tr>\n |
| y Lo\u1ea1i C<\/td>\n | 1.4<\/td>\n | 1.6<\/td>\n | 2<\/td>\n | 2.3<\/td>\n | 2.6<\/td>\n | 3<\/td>\n | 3.2<\/td>\n | 3.5<\/td>\n | 3.7<\/td>\n | 4.3<\/td>\n | 5<\/td>\n | 6<\/td>\n | 7.5<\/td>\n | 8<\/td>\n<\/tr>\n |
| y Lo\u1ea1i F<\/td>\n | 1.1<\/td>\n | 1.2<\/td>\n | 1.6<\/td>\n | 1.8<\/td>\n | 2.1<\/td>\n | 2.5<\/td>\n | 2.5<\/td>\n | 2.7<\/td>\n | 2.8<\/td>\n | 3.2<\/td>\n | 3.6<\/td>\n | 3.6<\/td>\n | 4.2<\/td>\n | 4.2<\/td>\n<\/tr>\n |
| y Lo\u1ea1i R<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | 2.7<\/td>\n | 3<\/td>\n | 3.2<\/td>\n | 3.6<\/td>\n | 4.3<\/td>\n | 5<\/td>\n | 6.3<\/td>\n | –<\/td>\n<\/tr>\n |
| Con s\u1ed1<\/td>\n | 0<\/td>\n | 1<\/td>\n | 2<\/td>\n | 3<\/td>\n | 4<\/td>\n | 5<\/td>\n | 6<\/td>\n | 7<\/td>\n | 8<\/td>\n | 10<\/td>\n | 12<\/td>\n | 14<\/td>\n | 16<\/td>\n | 20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n K\u00edch th\u01b0\u1edbc \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng mm. H\u00e3y ch\u1ecdn k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p d\u1ef1a tr\u00ean \u0111\u1ed9 d\u00e0y v\u1eadt li\u1ec7u v\u00e0 y\u00eau c\u1ea7u t\u1ea3i tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u.<\/p>\n H\u01b0\u1edbng d\u1eabn v\u00e0 l\u01b0u \u00fd khi n\u1ed9p \u0111\u01a1n<\/h2>\nKhi \u00e1p d\u1ee5ng ti\u00eau chu\u1ea9n GB\/T 5280-2002, c\u1ea7n ch\u1ecdn k\u00edch th\u01b0\u1edbc ren ph\u00f9 h\u1ee3p v\u1edbi v\u1eadt li\u1ec7u n\u1ec1n; b\u01b0\u1edbc ren nh\u1ecf h\u01a1n nh\u01b0 0,5 mm ph\u00f9 h\u1ee3p v\u1edbi t\u1ea5m m\u1ecfng, trong khi b\u01b0\u1edbc ren l\u1edbn h\u01a1n nh\u01b0 2,1 mm ph\u00f9 h\u1ee3p v\u1edbi v\u1eadt li\u1ec7u d\u00e0y h\u01a1n. \u0110\u1ea3m b\u1ea3o k\u00edch th\u01b0\u1edbc l\u1ed7 d\u1eabn h\u01b0\u1edbng ph\u00f9 h\u1ee3p \u0111\u1ec3 tr\u00e1nh n\u1ee9t v\u1ee1.<\/p>\n
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