{"id":5849,"date":"2025-12-25T03:25:27","date_gmt":"2025-12-25T03:25:27","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5849"},"modified":"2025-12-25T03:26:30","modified_gmt":"2025-12-25T03:26:30","slug":"din-7991-countersunk-hex-socket-screws-specs-torque","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/vi\/blog\/din-7991-countersunk-hex-socket-screws-specs-torque\/","title":{"rendered":"Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 m\u00f4-men xo\u1eafn c\u1ee7a v\u00edt l\u1ee5c gi\u00e1c ch\u00ecm DIN 7991"},"content":{"rendered":"
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Gi\u1edbi thi\u1ec7u<\/h2>\n

Ti\u00eau chu\u1ea9n DIN 7991 quy \u0111\u1ecbnh v\u00edt \u0111\u1ea7u ch\u00ecm c\u00f3 r\u00e3nh l\u1ee5c gi\u00e1c, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 v\u00edt \u0111\u1ea7u ph\u1eb3ng l\u1ee5c gi\u00e1c. C\u00e1c lo\u1ea1i \u1ed1c v\u00edt n\u00e0y c\u00f3 \u0111\u1ea7u h\u00ecnh n\u00f3n 90 \u0111\u1ed9 n\u1eb1m ngang b\u1eb1ng ho\u1eb7c th\u1ea5p h\u01a1n b\u1ec1 m\u1eb7t c\u1ee7a chi ti\u1ebft c\u1ea7n gh\u00e9p n\u1ed1i, t\u1ea1o ra h\u00ecnh d\u1ea1ng kh\u00ed \u0111\u1ed9ng h\u1ecdc g\u1ecdn g\u00e0ng, l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n gi\u1ea3m thi\u1ec3u \u0111\u1ed9 nh\u00f4 ra. R\u00e3nh l\u1ee5c gi\u00e1c b\u00ean trong cho ph\u00e9p truy\u1ec1n m\u00f4-men xo\u1eafn cao m\u00e0 kh\u00f4ng c\u1ea7n d\u1ee5ng c\u1ee5 v\u1eb7n ngo\u00e0i, t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 an to\u00e0n v\u00e0 gi\u1ea3m nguy c\u01a1 b\u1ecb can thi\u1ec7p.<\/p>\n

C\u00e1c lo\u1ea1i v\u00edt n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c ng\u00e0nh k\u1ef9 thu\u1eadt c\u01a1 kh\u00ed, h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, \u00f4 t\u00f4 v\u00e0 ch\u1ebf t\u1ea1o khu\u00f4n m\u1eabu nh\u1edd kh\u1ea3 n\u0103ng t\u1ea1o ra c\u00e1c m\u1ed1i n\u1ed1i ch\u1eafc ch\u1eafn, \u0111\u00e1ng tin c\u1eady trong kh\u00f4ng gian h\u1ea1n h\u1eb9p. \u0110\u01b0\u1ee3c s\u1ea3n xu\u1ea5t th\u00f4ng qua quy tr\u00ecnh r\u00e8n ngu\u1ed9i v\u00e0 t\u1ea1o ren, ch\u00fang \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n cao. H\u01b0\u1edbng d\u1eabn n\u00e0y tr\u00ecnh b\u00e0y chi ti\u1ebft k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n, th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u, t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc v\u00e0 khuy\u1ebfn ngh\u1ecb m\u00f4-men xo\u1eafn, d\u1ef1a tr\u00ean ti\u00eau chu\u1ea9n DIN 7991 v\u00e0 c\u00e1c ti\u00eau chu\u1ea9n ISO li\u00ean quan nh\u01b0 ISO 10642, nh\u1eb1m h\u1ed7 tr\u1ee3 c\u00e1c k\u1ef9 s\u01b0 trong vi\u1ec7c l\u1ef1a ch\u1ecdn, l\u1eafp \u0111\u1eb7t v\u00e0 \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng.<\/p>\n

Hi\u1ec3u r\u00f5 c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ea5u tr\u00fac, v\u00ec vi\u1ec7c l\u1ef1a ch\u1ecdn k\u00edch th\u01b0\u1edbc ho\u1eb7c l\u1ef1c si\u1ebft kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u1ecfng m\u1ed1i n\u1ed1i d\u01b0\u1edbi t\u1ea3i tr\u1ecdng. C\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 m\u00e1c v\u1eadt li\u1ec7u, b\u01b0\u1edbc ren v\u00e0 \u0111\u1ed9 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t, v\u00e0 vi\u1ec7c tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n s\u1ebd gi\u1ea3m thi\u1ec3u r\u1ee7i ro trong c\u00e1c c\u1ee5m l\u1eafp r\u00e1p quan tr\u1ecdng.<\/p>\n

K\u00edch th\u01b0\u1edbc v\u00e0 th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/h2>\n

Ti\u00eau chu\u1ea9n DIN 7991 quy \u0111\u1ecbnh dung sai k\u00edch th\u01b0\u1edbc ch\u00ednh x\u00e1c cho v\u00edt l\u1ee5c gi\u00e1c ch\u00ecm \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng thay th\u1ebf v\u00e0 l\u1eafp r\u00e1p ch\u00ednh x\u00e1c. C\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh bao g\u1ed3m \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a (d), b\u01b0\u1edbc ren (p), \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ea7u v\u00edt (dk), chi\u1ec1u cao \u0111\u1ea7u v\u00edt (k), k\u00edch th\u01b0\u1edbc l\u1ed7 ren (s) v\u00e0 g\u00f3c ch\u00ecm (th\u01b0\u1eddng l\u00e0 90\u00b0-92\u00b0). Chi\u1ec1u d\u00e0i v\u00edt c\u00f3 th\u1ec3 ng\u1eafn ho\u1eb7c d\u00e0i, v\u1edbi c\u00e1c t\u00f9y ch\u1ecdn ren to\u00e0n ph\u1ea7n ho\u1eb7c m\u1ed9t ph\u1ea7n. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft c\u00e1c k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n cho c\u00e1c c\u1ee1 t\u1eeb M3 \u0111\u1ebfn M24, d\u1ef1a tr\u00ean d\u1eef li\u1ec7u DIN 7991 \u0111\u00e3 \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng. L\u01b0u \u00fd r\u1eb1ng \u0111\u1ed1i v\u1edbi c\u00e1c c\u1ee1 l\u1edbn h\u01a1n nh\u01b0 M22 v\u00e0 M24, g\u00f3c ch\u00ecm v\u1eabn l\u00e0 90\u00b0-92\u00b0, nh\u1eb1m \u0111i\u1ec1u ch\u1ec9nh m\u1ecdi hi\u1ec3u l\u1ea7m c\u00f3 th\u1ec3 ph\u00e1t sinh t\u1eeb c\u00e1c ngu\u1ed3n kh\u00f4ng ti\u00eau chu\u1ea9n.<\/p>\n

C\u00e1c k\u00edch th\u01b0\u1edbc n\u00e0y t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho vi\u1ec7c l\u1eafp \u0111\u1eb7t ph\u1eb3ng, v\u1edbi ph\u1ea7n \u0111\u1ea7u \u0111\u01b0\u1ee3c \u0111\u1eb7t ho\u00e0n to\u00e0n ch\u00ecm v\u00e0o l\u1ed7 kho\u00e9t. C\u00e1c k\u1ef9 s\u01b0 n\u00ean ki\u1ec3m tra xem \u0111\u01b0\u1eddng k\u00ednh l\u1ed7 kho\u00e9t c\u00f3 kh\u1edbp v\u1edbi gi\u00e1 tr\u1ecb dk max hay kh\u00f4ng \u0111\u1ec3 tr\u00e1nh khe h\u1edf ho\u1eb7c s\u1ef1 c\u1ea3n tr\u1edf. Dung sai l\u00e0 lo\u1ea1i 10.9 ho\u1eb7c t\u01b0\u01a1ng \u0111\u01b0\u01a1ng tr\u1eeb khi c\u00f3 quy \u0111\u1ecbnh kh\u00e1c.<\/p>\n

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\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0110\u01b0\u1eddng k\u00ednh danh ngh\u0129a d<\/th>\nM3<\/th>\nM4<\/th>\nM5<\/th>\nM6<\/th>\nM8<\/th>\nM10<\/th>\nM12<\/th>\nM14<\/th>\nM16<\/th>\nM18<\/th>\nM20<\/th>\nM22<\/th>\nM24<\/th>\n<\/tr>\n
Cao \u0111\u1ed9 p<\/th>\n0.5<\/td>\n0.7<\/td>\n0.8<\/td>\n1<\/td>\n1.25<\/td>\n1.5<\/td>\n1.75<\/td>\n2<\/td>\n2<\/td>\n2.5<\/td>\n2.5<\/td>\n2.5<\/td>\n3<\/td>\n<\/tr>\n
Ph\u1ea1m vi chi\u1ec1u d\u00e0i l<\/th>\n8-40<\/td>\n8-40<\/td>\n10-60<\/td>\n12-60<\/td>\n16-100<\/td>\n20-100<\/td>\n25-100<\/td>\n25-100<\/td>\n30-100<\/td>\n30-100<\/td>\n30-100<\/td>\n35-100<\/td>\n35-100<\/td>\n<\/tr>\n
\u0110\u01b0\u1eddng k\u00ednh \u0111\u1ea7u dk<\/th>\nt\u1ed1i \u0111a<\/th>\n6<\/td>\n8<\/td>\n10<\/td>\n12<\/td>\n16<\/td>\n20<\/td>\n24<\/td>\n27<\/td>\n30<\/td>\n33<\/td>\n36<\/td>\n36<\/td>\n39<\/td>\n<\/tr>\n
ph\u00fat<\/th>\n5.7<\/td>\n7.64<\/td>\n9.64<\/td>\n11.57<\/td>\n15.57<\/td>\n19.48<\/td>\n23.48<\/td>\n26.48<\/td>\n29.48<\/td>\n32.38<\/td>\n35.38<\/td>\n35.38<\/td>\n38.38<\/td>\n<\/tr>\n
K\u00edch th\u01b0\u1edbc \u1ed5 c\u1eafm<\/th>\ndanh ngh\u0129a<\/th>\n2<\/td>\n2.5<\/td>\n3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n8<\/td>\n10<\/td>\n10<\/td>\n12<\/td>\n12<\/td>\n14<\/td>\n14<\/td>\n<\/tr>\n
t\u1ed1i \u0111a<\/th>\n2.1<\/td>\n2.6<\/td>\n3.1<\/td>\n4.12<\/td>\n5.14<\/td>\n6.14<\/td>\n8.175<\/td>\n10.175<\/td>\n10.175<\/td>\n12.212<\/td>\n12.212<\/td>\n14.212<\/td>\n14.212<\/td>\n<\/tr>\n
ph\u00fat<\/th>\n2.02<\/td>\n2.52<\/td>\n3.02<\/td>\n4.02<\/td>\n5.02<\/td>\n6.02<\/td>\n8.025<\/td>\n10.025<\/td>\n10.025<\/td>\n12.032<\/td>\n12.032<\/td>\n14.032<\/td>\n14.032<\/td>\n<\/tr>\n
Chi\u1ec1u cao \u0111\u1ea7u k<\/th>\nt\u1ed1i \u0111a<\/th>\n1.2<\/td>\n1.8<\/td>\n2.3<\/td>\n2.5<\/td>\n3.5<\/td>\n4.4<\/td>\n4.6<\/td>\n4.8<\/td>\n5.3<\/td>\n5.5<\/td>\n5.9<\/td>\n8.8<\/td>\n10.3<\/td>\n<\/tr>\n
ph\u00fat<\/th>\n0.95<\/td>\n1.55<\/td>\n2.05<\/td>\n2.25<\/td>\n3.2<\/td>\n4.1<\/td>\n4.3<\/td>\n4.5<\/td>\n5<\/td>\n5.2<\/td>\n5.6<\/td>\n8.44<\/td>\n9.87<\/td>\n<\/tr>\n
G\u00f3c v\u00e1t m\u00e9p \u03b1<\/th>\nt\u1ed1i \u0111a<\/th>\n92\u00b0<\/td>\n92\u00b0<\/td>\n<\/tr>\n
ph\u00fat<\/th>\n90\u00b0<\/td>\n90\u00b0<\/td>\n<\/tr>\n<\/thead>\n<\/table>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u0110\u1ec3 bi\u1ebft th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u1ea7y \u0111\u1ee7, bao g\u1ed3m chi\u1ec1u d\u00e0i ren v\u00e0 dung sai, h\u00e3y tham kh\u1ea3o ti\u00eau chu\u1ea9n DIN 7991 ho\u1eb7c ISO 10642. L\u01b0u \u00fd r\u1eb1ng chi\u1ec1u d\u00e0i \u0111\u01b0\u1ee3c \u0111o t\u1eeb \u0111\u1ec9nh \u0111\u1ea7u \u0111\u1ebfn m\u0169i, v\u00e0 ren to\u00e0n ph\u1ea7n l\u00e0 ti\u00eau chu\u1ea9n cho c\u00e1c chi\u1ec1u d\u00e0i ng\u1eafn h\u01a1n.<\/p>\n

V\u1eadt li\u1ec7u v\u00e0 th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/h2>\n

\u1ed0c v\u00edt theo ti\u00eau chu\u1ea9n DIN 7991 th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb th\u00e9p kh\u00f4ng g\u1ec9 \u0111\u1ec3 ch\u1ed1ng \u0103n m\u00f2n ho\u1eb7c th\u00e9p h\u1ee3p kim \u0111\u1ec3 c\u00f3 \u0111\u1ed9 b\u1ec1n cao. C\u00e1c v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn bao g\u1ed3m th\u00e9p kh\u00f4ng g\u1ec9 A2 (SUS304) v\u00e0 A4 (SUS316), c\u00f3 \u0111\u1ed9 b\u1ec1n tuy\u1ec7t v\u1eddi trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111\u1ea3m b\u1ea3o duy tr\u00ec c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc nh\u01b0 \u0111\u1ed9 b\u1ec1n k\u00e9o v\u00e0 \u0111\u1ed9 c\u1ee9ng.<\/p>\n

C\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 \u0111\u1eb7c t\u00ednh kh\u00f4ng nhi\u1ec5m t\u1eeb v\u00e0 ch\u1ed1ng oxy h\u00f3a, th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, h\u00e0ng h\u1ea3i v\u00e0 y t\u1ebf. C\u00e1c phi\u00ean b\u1ea3n th\u00e9p h\u1ee3p kim, th\u01b0\u1eddng thu\u1ed9c c\u00e1c c\u1ea5p \u0111\u1ed9 b\u1ec1n 8.8, 10.9 ho\u1eb7c 12.9, \u0111\u01b0\u1ee3c x\u1eed l\u00fd nhi\u1ec7t \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 b\u1ec1n trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ebft c\u1ea5u. C\u00e1c l\u1edbp ph\u1ee7 b\u1ec1 m\u1eb7t nh\u01b0 oxit \u0111en ho\u1eb7c m\u1ea1 k\u1ebdm gi\u00fap b\u1ea3o v\u1ec7 th\u00eam ch\u1ed1ng m\u00e0i m\u00f2n.<\/p>\n

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V\u1eadt li\u1ec7u<\/th>\nTh\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc (%)<\/th>\n<\/tr>\n
C<\/th>\nMn<\/th>\nSi<\/th>\nP<\/th>\nS<\/th>\nNi<\/th>\nMo<\/th>\nCr<\/th>\n<\/tr>\n<\/thead>\n
SUS304 (A2)<\/td>\n\u22640,08<\/td>\n\u22642,00<\/td>\n\u22641,00<\/td>\n\u22640,045<\/td>\n\u22640,03<\/td>\n8.00-11.00<\/td>\n–<\/td>\n17.00-19.00<\/td>\n<\/tr>\n
SUS316 (A4)<\/td>\n\u22640,08<\/td>\n\u22642,00<\/td>\n\u22641,00<\/td>\n\u22640,045<\/td>\n\u22640,03<\/td>\n10.00-14.00<\/td>\n2.00-3.00<\/td>\n16.00-18.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u0110\u1ed1i v\u1edbi c\u00e1c t\u00f9y ch\u1ecdn th\u00e9p cacbon, th\u00e0nh ph\u1ea7n thay \u0111\u1ed5i t\u00f9y theo m\u00e1c th\u00e9p (v\u00ed d\u1ee5: 10.9: C 0,20-0,55%, Mn 0,40-0,90%). Ch\u1ecdn d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng; A4 th\u00edch h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng bi\u1ec3n do h\u00e0m l\u01b0\u1ee3ng molypden gi\u00fap t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n r\u1ed7.<\/p>\n

T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/h2>\n

C\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc c\u1ee7a v\u00edt DIN 7991 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i theo ti\u00eau chu\u1ea9n ISO 3506 \u0111\u1ed1i v\u1edbi th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 ISO 898 \u0111\u1ed1i v\u1edbi th\u00e9p cacbon. C\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 A2-50, A2-70 v\u00e0 A4-80 c\u00f3 \u0111\u1ed9 b\u1ec1n k\u00e9o t\u1eeb 500 \u0111\u1ebfn 800 MPa, v\u1edbi gi\u1edbi h\u1ea1n ch\u1ea3y t\u1eeb 210-450 MPa. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 d\u1ebbo dai \u0111\u1ec3 ch\u1ed1ng rung trong khi v\u1eabn cung c\u1ea5p \u0111\u1ed9 c\u1ee9ng \u0111\u1ee7 (HV 150-300) cho \u0111\u1ed9 b\u1ec1n truy\u1ec1n \u0111\u1ed9ng.<\/p>\n

C\u00e1c lo\u1ea1i th\u00e9p cacbon thu\u1ed9c c\u1ea5p 8.8, 10.9 v\u00e0 12.9 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 b\u1ec1n cao h\u01a1n (\u0111\u1ed9 b\u1ec1n k\u00e9o 800-1200 MPa), l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng ch\u1ecbu t\u1ea3i. C\u00e1c \u0111\u1eb7c t\u00ednh bao g\u1ed3m \u0111\u1ed9 gi\u00e3n d\u00e0i t\u1ed1i thi\u1ec3u 12% v\u00e0 \u0111\u1ed9 d\u1ebbo dai va \u0111\u1eadp cho vi\u1ec7c s\u1eed d\u1ee5ng \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Th\u1eed nghi\u1ec7m theo ti\u00eau chu\u1ea9n DIN EN ISO 6892-1 x\u00e1c nh\u1eadn s\u1ef1 ph\u00f9 h\u1ee3p, v\u1edbi \u0111\u1ed9 c\u1ee9ng b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t \u0111\u1ec3 ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng gi\u00f2n hydro trong c\u00e1c v\u00edt m\u1ea1.<\/p>\n

H\u01b0\u1edbng d\u1eabn ch\u00ednh: Ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng su\u1ea5t s\u1eed d\u1ee5ng; A4-80 cho m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n v\u1edbi nhu c\u1ea7u \u0111\u1ed9 b\u1ec1n cao. N\u00ean th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra c\u00e1c v\u1ebft n\u1ee9t do m\u1ecfi trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p t\u1ea3i tr\u1ecdng chu k\u1ef3.<\/p>\n

Ti\u00eau chu\u1ea9n m\u00f4-men xo\u1eafn<\/h2>\n

Gi\u00e1 tr\u1ecb m\u00f4-men xo\u1eafn cho v\u00edt DIN 7991 \u0111\u1ea3m b\u1ea3o k\u1eb9p ch\u1eb7t \u0111\u00fang c\u00e1ch m\u00e0 kh\u00f4ng b\u1ecb tr\u1eddn ren ho\u1eb7c h\u1ecfng \u0111\u1ea7u v\u00edt. M\u00f4-men xo\u1eafn ph\u00e1 v\u1ee1 t\u1ed1i thi\u1ec3u (t\u00ednh b\u1eb1ng Nm, \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i t\u1eeb kgf.cm \u0111\u1ec3 ch\u00ednh x\u00e1c: 1 kgf.cm \u2248 0,098 Nm) \u0111\u01b0\u1ee3c quy \u0111\u1ecbnh cho c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9. \u0110\u00e2y l\u00e0 c\u00e1c th\u1eed nghi\u1ec7m ph\u00e1 h\u1ee7y theo ti\u00eau chu\u1ea9n DIN EN ISO 3506-1, cho bi\u1ebft m\u00f4-men xo\u1eafn m\u00e0 t\u1ea1i \u0111\u00f3 v\u00edt b\u1ecb g\u00e3y do xo\u1eafn.<\/p>\n

\u0110\u1ec3 l\u1eafp \u0111\u1eb7t, s\u1eed d\u1ee5ng m\u00f4-men xo\u1eafn ph\u00e1 v\u1ee1 70-80% l\u00e0m gi\u00e1 tr\u1ecb l\u1eafp \u0111\u1eb7t, \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh cho ch\u1ea5t b\u00f4i tr\u01a1n (\u03bc=0,125 cho lo\u1ea1i tr\u01a1n, 0,094 cho lo\u1ea1i m\u1ea1). T\u00ednh to\u00e1n t\u1ea3i tr\u01b0\u1edbc th\u00f4ng qua VDI 2230 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u1eafc ch\u1eafn c\u1ee7a m\u1ed1i n\u1ed1i. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y li\u1ec7t k\u00ea c\u00e1c m\u00f4-men xo\u1eafn ph\u00e1 v\u1ee1 t\u1ed1i thi\u1ec3u, \u0111\u01b0\u1ee3c ki\u1ec3m ch\u1ee9ng d\u1ef1a tr\u00ean d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n.<\/p>\n

\n
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<\/div>\n<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Ch\u1ee7 \u0111\u1ec1<\/th>\nL\u1edbp t\u00e0i s\u1ea3n<\/th>\n<\/tr>\n
A2-50<\/th>\nA2-70<\/th>\nA4-80<\/th>\n<\/tr>\n
M\u00f4-men xo\u1eafn ph\u00e1 v\u1ee1 t\u1ed1i thi\u1ec3u (Nm)<\/th>\n<\/tr>\n<\/thead>\n
M1.6<\/td>\n0.15<\/td>\n0.2<\/td>\n0.24<\/td>\n<\/tr>\n
M2<\/td>\n0.3<\/td>\n0.4<\/td>\n0.48<\/td>\n<\/tr>\n
M2.5<\/td>\n0.6<\/td>\n0.9<\/td>\n0.96<\/td>\n<\/tr>\n
M3<\/td>\n1.1<\/td>\n1.6<\/td>\n1.8<\/td>\n<\/tr>\n
M4<\/td>\n2.7<\/td>\n3.8<\/td>\n4.3<\/td>\n<\/tr>\n
M5<\/td>\n5.5<\/td>\n7.8<\/td>\n8.8<\/td>\n<\/tr>\n
M6<\/td>\n9.3<\/td>\n13<\/td>\n15<\/td>\n<\/tr>\n
M8<\/td>\n23<\/td>\n32<\/td>\n37<\/td>\n<\/tr>\n
M10<\/td>\n46<\/td>\n65<\/td>\n74<\/td>\n<\/tr>\n
M12<\/td>\n80<\/td>\n110<\/td>\n130<\/td>\n<\/tr>\n
M16<\/td>\n210<\/td>\n290<\/td>\n330<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\u0110\u1ed1i v\u1edbi th\u00e9p cacbon, m\u00f4-men xo\u1eafn si\u1ebft ch\u1eb7t khuy\u1ebfn ngh\u1ecb (MA t\u00ednh b\u1eb1ng Nm) cho c\u1ea5p 10.9 cao h\u01a1n: M3=1.4, M4=3.4, M5=6.8, M6=11, M8=28, M10=55, v.v., theo ti\u00eau chu\u1ea9n ISO 898-1. S\u1eed d\u1ee5ng c\u1edd l\u00ea l\u1ef1c \u0111\u01b0\u1ee3c hi\u1ec7u chu\u1ea9n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u00b14% v\u00e0 xem x\u00e9t h\u1ec7 s\u1ed1 ma s\u00e1t \u0111\u1ec3 c\u00f3 l\u1ef1c si\u1ebft tr\u01b0\u1edbc ch\u00ednh x\u00e1c.<\/p>\n

Quy tr\u00ecnh s\u1ea3n xu\u1ea5t<\/h2>\n

Vi\u1ec7c s\u1ea3n xu\u1ea5t v\u00edt DIN 7991 th\u01b0\u1eddng bao g\u1ed3m gia c\u00f4ng \u0111\u1ea7u ngu\u1ed9i tr\u00ean m\u00e1y nhi\u1ec1u tr\u1ea1m, t\u1ea1o h\u00ecnh \u0111\u1ea7u c\u00f4n v\u00e0 l\u1ed7 l\u1ee5c gi\u00e1c trong m\u1ed9t ho\u1eb7c hai l\u1ea7n d\u1eadp. Quy tr\u00ecnh n\u00e0y \u0111\u1ea3m b\u1ea3o s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u hi\u1ec7u qu\u1ea3 cao v\u00e0 h\u00ecnh d\u1ea1ng ch\u00ednh x\u00e1c. Sau \u0111\u00f3, vi\u1ec7c t\u1ea1o ren \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1eb1ng m\u00e1y c\u00e1n t\u1ef1 \u0111\u1ed9ng, t\u1ea1o ra c\u00e1c ren \u0111\u1ed3ng \u0111\u1ec1u v\u1edbi \u00edt bavia.<\/p>\n

X\u1eed l\u00fd nhi\u1ec7t \u0111\u1ed1i v\u1edbi th\u00e9p h\u1ee3p kim bao g\u1ed3m t\u00f4i v\u00e0 ram \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 c\u1ee9ng mong mu\u1ed1n (v\u00ed d\u1ee5: 39-44 HRC cho th\u00e9p 10,9). C\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 tr\u1ea3i qua qu\u00e1 tr\u00ecnh \u1ee7 \u0111\u1ec3 d\u1ec5 gia c\u00f4ng. Ki\u1ec3m so\u00e1t ch\u1ea5t l\u01b0\u1ee3ng bao g\u1ed3m ki\u1ec3m tra k\u00edch th\u01b0\u1edbc theo ti\u00eau chu\u1ea9n DIN EN ISO 4759 v\u00e0 ki\u1ec3m tra ren theo ti\u00eau chu\u1ea9n GO\/NO-GO. X\u1eed l\u00fd b\u1ec1 m\u1eb7t nh\u01b0 th\u1ee5 \u0111\u1ed9ng h\u00f3a \u0111\u1ed1i v\u1edbi th\u00e9p kh\u00f4ng g\u1ec9 ho\u1eb7c m\u1ea1 \u0111i\u1ec7n \u0111\u1ed1i v\u1edbi th\u00e9p carbon gi\u00fap t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n.<\/p>\n

C\u00f4ng ngh\u1ec7 s\u1ea3n xu\u1ea5t ti\u00ean ti\u1ebfn s\u1eed d\u1ee5ng m\u00e1y CNC \u0111\u1ec3 gia c\u00f4ng c\u00e1c chi ti\u1ebft c\u00f3 chi\u1ec1u d\u00e0i t\u00f9y ch\u1ec9nh v\u00e0 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m phi ti\u00eau chu\u1ea9n, \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng truy xu\u1ea5t ngu\u1ed3n g\u1ed1c th\u00f4ng qua s\u1ed1 l\u00f4. Quy tr\u00ecnh n\u00e0y t\u1ea1o ra c\u00e1c chi ti\u1ebft l\u1eafp gh\u00e9p c\u00f3 hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh, gi\u1ea3m thi\u1ec3u s\u1ef1 bi\u1ebfn \u0111\u1ed9ng trong c\u00e1c c\u1ee5m l\u1eafp r\u00e1p.<\/p>\n

\u1ee8ng d\u1ee5ng<\/h2>\n

\u1ed0c v\u00edt DIN 7991 v\u01b0\u1ee3t tr\u1ed9i trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p y\u00eau c\u1ea7u b\u1ec1 m\u1eb7t ph\u1eb3ng, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u1ea5m th\u00e2n m\u00e1y bay, khung g\u1ea7m \u00f4 t\u00f4 v\u00e0 khu\u00f4n m\u1eabu ch\u00ednh x\u00e1c. Trong \u0111\u01b0\u1eddng s\u1eaft cao t\u1ed1c, ch\u00fang c\u1ed1 \u0111\u1ecbnh c\u00e1c b\u1ed9 ph\u1eadn m\u00e0 kh\u00f4ng g\u00e2y l\u1ef1c c\u1ea3n kh\u00ed \u0111\u1ed9ng h\u1ecdc. C\u00e1c c\u1ee5m c\u01a1 kh\u00ed \u0111\u01b0\u1ee3c h\u01b0\u1edfng l\u1ee3i t\u1eeb kh\u1ea3 n\u0103ng ch\u1ecbu momen xo\u1eafn cao c\u1ee7a ch\u00fang, trong khi c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed s\u1eed d\u1ee5ng ch\u00fang cho c\u00e1c v\u1ecf ch\u1eafn nhi\u1ec5u \u0111i\u1ec7n t\u1eeb (EMI).<\/p>\n

M\u1eb9o l\u1ef1a ch\u1ecdn: S\u1eed d\u1ee5ng lo\u1ea1i A4 trong m\u00f4i tr\u01b0\u1eddng \u1ea9m \u01b0\u1edbt; lo\u1ea1i 12.9 cho c\u00e1c m\u1ed1i n\u1ed1i ch\u1ecbu l\u1ef1c cao. K\u1ebft h\u1ee3p v\u1edbi l\u1ed7 kho\u00e9t ch\u00ecm theo ti\u00eau chu\u1ea9n DIN 74 \u0111\u1ec3 \u0111\u1ea1t \u0111\u1ed9 kh\u00edt t\u1ed1i \u01b0u. \u1ede nh\u1eefng khu v\u1ef1c d\u1ec5 rung \u0111\u1ed9ng, h\u00e3y s\u1eed d\u1ee5ng ch\u1ea5t kh\u00f3a ren \u0111\u1ec3 duy tr\u00ec l\u1ef1c si\u1ebft tr\u01b0\u1edbc. Nh\u1eefng \u1ee9ng d\u1ee5ng n\u00e0y cho th\u1ea5y t\u00ednh linh ho\u1ea1t c\u1ee7a v\u00edt trong vi\u1ec7c t\u1ea1o ra c\u00e1c m\u1ed1i n\u1ed1i ch\u1eafc ch\u1eafn v\u00e0 th\u1ea9m m\u1ef9.<\/p>\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p (FAQ)<\/h2>\n
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G\u00f3c v\u00e1t m\u00e9p ti\u00eau chu\u1ea9n cho v\u00edt DIN 7991 l\u00e0 bao nhi\u00eau?<\/dt>\n
G\u00f3c v\u00e1t m\u00e9p l\u00e0 t\u1eeb 90\u00b0 t\u1ed1i thi\u1ec3u \u0111\u1ebfn 92\u00b0 t\u1ed1i \u0111a cho t\u1ea5t c\u1ea3 c\u00e1c k\u00edch th\u01b0\u1edbc t\u1eeb M3 \u0111\u1ebfn M24, \u0111\u1ea3m b\u1ea3o kh\u1edbp ch\u00ednh x\u00e1c v\u00e0o c\u00e1c l\u1ed7 t\u01b0\u01a1ng \u1ee9ng m\u00e0 kh\u00f4ng b\u1ecb nh\u00f4 ra ngo\u00e0i.<\/dd>\n<\/dl>\n
\n
T\u00f4i n\u00ean ch\u1ecdn lo\u1ea1i v\u1eadt li\u1ec7u n\u00e0o cho ph\u00f9 h\u1ee3p?<\/dt>\n
Ch\u1ecdn A2-70 \u0111\u1ec3 ch\u1ed1ng \u0103n m\u00f2n n\u00f3i chung, A4-80 cho m\u00f4i tr\u01b0\u1eddng bi\u1ec3n ho\u1eb7c axit do c\u00f3 ch\u1ee9a molypden. \u0110\u1ec3 c\u00f3 \u0111\u1ed9 b\u1ec1n cao, h\u00e3y ch\u1ecdn th\u00e9p carbon 10.9 ho\u1eb7c 12.9 c\u00f3 l\u1edbp ph\u1ee7 b\u1ea3o v\u1ec7.<\/dd>\n<\/dl>\n
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T\u00f4i n\u00ean s\u1eed d\u1ee5ng m\u00f4-men xo\u1eafn bao nhi\u00eau khi l\u1eafp \u0111\u1eb7t?<\/dt>\n
S\u1eed d\u1ee5ng m\u00f4-men xo\u1eafn ph\u00e1 v\u1ee1 t\u1ed1i thi\u1ec3u 70-80%, \u0111i\u1ec1u ch\u1ec9nh theo ma s\u00e1t. V\u00ed d\u1ee5: M6 A2-70: l\u1eafp \u0111\u1eb7t \u1edf m\u1ee9c 9-10 Nm. Lu\u00f4n hi\u1ec7u chu\u1ea9n d\u1ee5ng c\u1ee5 v\u00e0 c\u00e2n nh\u1eafc vi\u1ec7c b\u00f4i tr\u01a1n.<\/dd>\n<\/dl>\n
\n
Nh\u1eefng lo\u1ea1i \u1ed1c v\u00edt n\u00e0y c\u00f3 ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 \u0111\u1ed9 rung cao kh\u00f4ng?<\/dt>\n
C\u00f3, v\u1edbi c\u00e1c ch\u1ea5t kh\u00f3a ren ho\u1eb7c t\u00ednh n\u0103ng duy tr\u00ec m\u00f4-men xo\u1eafn. \u200b\u200bC\u01a1 c\u1ea5u truy\u1ec1n \u0111\u1ed9ng b\u00ean trong v\u00e0 thi\u1ebft k\u1ebf ph\u1eb3ng gi\u00fap gi\u1ea3m nguy c\u01a1 n\u1edbi l\u1ecfng trong c\u00e1c t\u1ea3i tr\u1ecdng \u0111\u1ed9ng nh\u01b0 m\u00e1y m\u00f3c ho\u1eb7c xe c\u1ed9.<\/dd>\n<\/dl>\n
\n
Qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng nh\u01b0 th\u1ebf n\u00e0o?<\/dt>\n
Gia c\u00f4ng \u0111\u1ea7u ngu\u1ed9i \u0111\u1ea3m b\u1ea3o h\u00ecnh d\u1ea1ng \u0111\u1ea7u ch\u00ednh x\u00e1c; gia c\u00f4ng ren kh\u00f4ng \u0111\u00fang c\u00e1ch c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng t\u1eadp trung \u1ee9ng su\u1ea5t. H\u00e3y y\u00eau c\u1ea7u c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c ch\u1ee9ng nh\u1eadn tu\u00e2n th\u1ee7 ti\u00eau chu\u1ea9n DIN EN ISO 9001 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u00edch th\u01b0\u1edbc v\u00e0 \u0111\u1ed9 b\u1ec1n nh\u1ea5t qu\u00e1n.<\/dd>\n<\/dl>\n
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C\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u1ed1c v\u00edt theo ti\u00eau chu\u1ea9n DIN 7991 v\u1edbi c\u00e1c v\u1eadt li\u1ec7u phi kim lo\u1ea1i kh\u00f4ng?<\/dt>\n
C\u00f3, \u0111\u1ed1i v\u1edbi v\u1eadt li\u1ec7u composite ho\u1eb7c nh\u1ef1a c\u00f3 c\u00e1c chi ti\u1ebft ch\u00e8n ph\u00f9 h\u1ee3p, nh\u01b0ng c\u1ea7n ki\u1ec3m tra t\u00ednh t\u01b0\u01a1ng th\u00edch \u0111\u1ec3 tr\u00e1nh b\u1ecb v\u1ee1. C\u00f3 th\u1ec3 c\u1ea7n gi\u00e1 tr\u1ecb m\u00f4-men xo\u1eafn th\u1ea5p h\u01a1n \u0111\u1ec3 tr\u00e1nh l\u00e0m h\u1ecfng v\u1eadt li\u1ec7u.<\/dd>\n<\/dl>\n<\/div>","protected":false},"excerpt":{"rendered":"

Introduction DIN 7991 specifies countersunk head cap screws with hexagon socket drives, commonly known as flat head hex socket screws. These fasteners feature a 90-degree conical head that sits flush with or below the surface of the mated part, providing a clean, aerodynamic profile ideal for applications where protrusion must be minimized. The internal hex […]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5849","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5849","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/comments?post=5849"}],"version-history":[{"count":2,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5849\/revisions"}],"predecessor-version":[{"id":5851,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/posts\/5849\/revisions\/5851"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/media?parent=5849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/categories?post=5849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/vi\/wp-json\/wp\/v2\/tags?post=5849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}