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1、Screw threads and tolerances 扣件之螺紋精度等級與尺寸公差(複習與演算)By: Steven Fang .tw,2003/08/11,先學會計算三角形面積,30,A,B,C,三角形ABC面積 = (1 /3S X S) =1 /23 S2,計算六角形面積公式,A,B,C,六角形面積 = 1 /23 S2 X 3 = 3/2 S2 = 0.866025 S2,三角形ABC面積 = (1 /3S X S) =1 /23 S2,Nut thread,螺紋有效徑計算,Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D -
2、0.649519P,Bolt thread,60o,螺距 p,有效徑,陽螺紋大徑(螺絲外徑),陰螺紋小徑(螺帽孔徑),1/4 H,1/8 H,H,H = 0.866025 P,Major Dia.,Pitch Dia.,Minor Dia.,1/2 H,3/8H,Basic thread profile - Metric,Nut,Bolt,60o,學會計算基本螺紋尺寸(I),M6 X 1.0 - 6H basic Pitch Diameter, Minor Diameter,M6 X 1.0 - 6g 之 Pitch Diameter, Major Diameter,Basic Pitch D
3、ia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 1.0 = 5.350,Basic Minor Dia. = D - 2 X 5/8H = D - 5/4 X 0.866025P = D - 1.083P = 6 - 1.083 X 1.0 = 4.917,Basic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 1.0 = 5.350,學會計算基本螺紋尺寸(II),M6 X 0.
4、75 6e之 Pitch Diameter, Major Diameter,M6 X 0.75 - 6g 之 Pitch Diameter, Major Diameter,Basic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 0.75 = 5.513,Basic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 0.75 = 5.513,Thread toleran
5、ce position-Metric,Zero Line 基準線（零線）,4h,6g,8g,Nut thread,Bolt thread,M6 X 0.75,Technical data,Fasteners tolerances ISO4759,ISO tolerances,Tolerances,h14,h13,Example: Size M6 X 25,Hexagon nuts weight calculation,m 厚度,六角螺帽重量 g/pc = (六角面積 - 圓面積) X 厚度 X 7.85g/1,000,圓面積 = /4 X Pitch Dia.2,DIN ISO 2768-1,DIN ISO 7168,表面粗度 Surface roughness,Wind turbine/windmill/wind power,Wind turbine/wind mill/wind power,BONUS Energy A/S,NEG Micon A/S,Nordex A/S,Vestas Wind Systems A/S,LM Glasfiber A/S,Infra-vest 英華威 ?,