螺紋精度等級(jí)與尺寸公差ppt課件

1、1Screw threads and tolerances 扣件之螺紋精度等級(jí)與尺寸公差扣件之螺紋精度等級(jí)與尺寸公差(複習(xí)與演算複習(xí)與演算)By: Steven Fang 方君偉方君偉2003/08/11 2先學(xué)會(huì)計(jì)算三角形面積先學(xué)會(huì)計(jì)算三角形面積303計(jì)算六角形面積公式計(jì)算六角形面積公式304 Nut thread螺紋有效徑計(jì)算螺紋有效徑計(jì)算 Bolt thread60o螺距螺距 p有效徑有效徑陽(yáng)螺紋大徑陽(yáng)螺紋大徑(螺絲外徑螺絲外徑)陰螺紋小徑陰螺紋小徑( (螺帽孔徑螺帽孔徑) )1/4 H1/8 H HMajor Dia.Pitch Dia.Minor Dia.1/2 H5Basic th

2、read profile - MetricNut threadBasic Profile (Zero Line) Bolt thread螺紋公差螺紋公差ToleranceNutBolt60o6學(xué)會(huì)計(jì)算基本螺紋尺寸學(xué)會(huì)計(jì)算基本螺紋尺寸(I)M6 X 1.0 - 6H basic Pitch Diameter, Minor DiameterM6 X 1.0 - 6g 之之 Pitch Diameter, Major DiameterBasic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519

3、 X 1.0 = 5.350Basic Minor Dia. = D - 2 X 5/8H = D - 5/4 X 0.866025P = D - 1.083P = 6 - 1.083 X 1.0 = 4.917Basic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 1.0 = 5.350g = - 26u 5.350 0.026 = 5.3246級(jí)級(jí) 1.0 bolt PD tolerance = 112u 5.324 0.112 = 5.212g = - 26u 6.000

4、 0.026 = 5.9746級(jí)級(jí) 1.0 bolt MD tolerance = 180u 5.974 0.180 = 5.7947學(xué)會(huì)計(jì)算基本螺紋尺寸學(xué)會(huì)計(jì)算基本螺紋尺寸(II)M6 X 0.75 6e之之 Pitch Diameter, Major DiameterM6 X 0.75 - 6g 之之 Pitch Diameter, Major DiameterBasic Pitch Dia. = D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 0.75 = 5.513Basic Pitch Dia.

5、= D - 2 X 3/8H = D - 3/4 X 0.866025P = D - 0.649519P = 6 - 0.649519 X 0.75 = 5.513g = - 22u 5.513 0.022 = 5.4916級(jí)級(jí) 0.75 bolt PD tolerance = 100u 5.491 0.100 = 5.391e = - 56u 6.000 0.056 = 5.9446級(jí)級(jí) 0.75 bolt MD tolerance = 140u 5.944 0.140 = 5.804e = - 56u 5.513 0.056 = 5.4576級(jí)級(jí) 0.75 bolt PD toleranc

6、e = 100u 5.457 0.100 = 5.357g = - 22u 6.000 0.022 = 5.9786級(jí)級(jí) 0.75 bolt MD tolerance = 140u 5.978 0.140 = 5.8378Thread tolerance position-Metric5H7H6HZero Line 基準(zhǔn)線（零線）基準(zhǔn)線（零線）4h6g8g電鍍餘隙電鍍餘隙 AllowancegfNut threadBolt threade6eM6 X 0.75-22-38-569Technical dataMaterialSteelGeneral requirementsAs specifie

7、d in DIN 267 Part1ThreadTolerance6gStandardDIN 13 Parts 12 and 15MechanicalpropertiesProperty class(material)8.8,5.6,10.9 M39:subject to agreementStandardISO 898 Part 1Limitdeviations,geometricaltolerancesProduct gradeA for products up to size M24and L 10d or 150mmB for products exceeding sizeM24 or

8、 L 10d or 150mmStandardISO 4759 Part 110 Fasteners tolerances ISO4759 11ISO tolerances12Tolerancesh14h13h13+2Pjs15js14Example: Size M6 X 2513Hexagon nuts weight calculation六角螺帽重量六角螺帽重量 g/pc= (六角面積六角面積 - 圓面積圓面積) X 厚度厚度 X 7.85g/1,000圓面積圓面積 = /4 X Pitch Dia.214DIN ISO 2768-1Tolerance- Class(Line measur

9、ement)Limits in mm for nominal sizes in mm0,5to3above3 to 6above6to30above30to120above120to400above400to1000above1000to2000above2000to4000f (fine) 0,05 0,05 0,1 0,15 0,2 0,3 0,5-m (medium) 0,1 0,1 0,2 0,3 0,5 0,8 1,2 2c (coarse) 0,15 0,2 0,5 0,8 1,2 2 3 4v (very coarse)- 0,5 1 1,5 2,5 4 6 8Tolerance

10、Class(radius and chamfer) Limits in mm for nominal sizes in mm0,5to3above3to6above6f (finne) 0,2 0,5 1m (medium)c (coarse) 0,4 1 2v (very coarse)15DIN ISO 7168Tolerance Class0.5to3Over3To6Over6To30Over 30To120Over120To400Over400To1000Over1000To2000Over2000To4000F (fine) 0,05 0,05 0,1 0,15 0,2 0,3 0,

11、5 0,8M (means) 0,1 0,1 0,2 0,3 0,5 0,8 1,2 2,0G (roughly) 0,15 0,2 0,5 0,8 1,2 2,0 3,0 4,0Sg (very rough)- 0,5 1,0 1,5 2,0 3,0 4,0 6,016表面粗度表面粗度 Surface roughnessRoughness,RaGrade GradeWorking processumNumber Mark6.3N9Sawing, Forging3.2N8Shaping, Drilling,1.6N7Broaching, Milling, Laser0.8N6Electro-Chemical0.4N5Turning, Grinding0.2N4Electro-Polish, Honing0.1N3Polishing0.05N2Lapping0.025N1Super