第7章螺纹紧固件

1、 Slotted cone pointed set screw. Hex nut. Slotted nut . Bright washer. Spring washer. Tab washer Hexagon head bolt. Stud. Slotted cheese head screw. Slotted pan head screw. Slotted countersunk screw. Hexagon socket cap 6. GB/ T97.1 6 140HV l (3) (2) 常见联接型式常见联接型式(1) (3) Representation 常见画法常见画法(1) (2)

2、 Example : Draw an assembly using a M10 bolt, Component thickness is t1=10mm,t2=15mm, and clearance adjustment in medium. Choice l by GB/T 5782 1 12 23 34 45 5ID NAME GRADE F Fu ul ll ls se ec ct ti io on n Draw an assembly using a M20 bolt, Component thickness ist1=12mm, t2=15mm, and clearance adju

3、stment in medium. (Scale 1:1) 用螺纹规格为用螺纹规格为 M 20的螺纹紧固件将厚度为的螺纹紧固件将厚度为t1=10mm,t2=15mm的两零件联接的两零件联接, 以中等装配精度画其螺纹联接装配图。以中等装配精度画其螺纹联接装配图。 (比例比例1:1) 本 小 节 结 束 画图要点画图要点: : The contact surface of two parts is represented as a line. When two joint parts are cut the directions of their section lines shall be re

4、versed. When a section face cuts the fastening parts these are not drawn according to section drawings, but still following their outlines. The nut and bolt head can be simply drawn as outlines.Bolt Joints Stud Joints Metal end旋入端旋入端Nut end露出端露出端bm=1d bm=1d ( (Steel钢钢) )bm=1.25dbm=1.25d or or 1.5d 1

5、.5d ( (Cast iron铸铁铸铁) )bm=2dbm=2d ( (Aluminum铝铝) ) Screw Joints Bolt The bolt assembly is used when joint parts are not too thick to drill through holes. Stud Stud are used in situations where a part with a through hole and a part with blind tapped hole.Screw Screws are mostly used for the cases wit

6、h small bearing forces. such as inspection covers which have to be removed frequently.Nut are used to match the other screw fasteners. Washer are used to match the other screw fasteners. 外舌止动垫圈圆螺母止动垫圈装配前各零件 Holes of stud and screw Thread specification In close In mediumFree fit Through holes02030360

7、60PRRR001PPRRRPP6060 4.4.以倒角圆半径以倒角圆半径R R过上表面中心过上表面中心画圆弧画圆弧, ,求与中心线的交点求与中心线的交点0 01 1后后再画圆弧再画圆弧, ,求与中心线的交点求与中心线的交点P P和和二圆弧的二个交点二圆弧的二个交点P P 。5.5.分别以分别以P P和和PP为圆心为圆心, ,以圆心以圆心至上表面距离为半径至上表面距离为半径画画圆弧圆弧, ,既既为为倒角圆弧倒角圆弧。 6.6.重复上述方法重复上述方法画画下表面圆弧并下表面圆弧并在二边画出在二边画出3030斜线的斜线的倒角倒角。7.7.画侧视图上下表面画侧视图上下表面, ,使其宽等使其宽等于对边

8、距于对边距( (倒角圆直径倒角圆直径),),分别以分别以上表面中心和二边为圆心以倒角上表面中心和二边为圆心以倒角圆半径画圆弧圆半径画圆弧, ,求出三圆弧的二求出三圆弧的二交点交点PP。8.8.再以再以PP为圆心为圆心. .PP至上至上表面的距离为半径表面的距离为半径 画倒角圆的画倒角圆的圆弧圆弧既可既可, ,再按此法画另一面的再按此法画另一面的圆弧。圆弧。 注意：侧视图二边是直角。注意：侧视图二边是直角。0.8DAF=1.5D=241.5=36DAF=1.5DSteps ： 1.1.以以1.51.5D D为直径为直径画倒角圆画倒角圆, ,再用再用6060直尺直尺画其外接六边形画其外接六边形。2.2.画螺纹大径画螺纹大径2424和小径和小径20.20.7575的的圆形圆形( (大径用细线画大径用细线画3/43/4圈圈) )。3.3.将