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自攻螺丝扭力测试(self-threading screw torque test):, c# Q m! c, q5 m' k% [& R
1。测试对象
" l; A% B/ o% x& \8 Z. V8 H8 g5.10.2 Self-threading screws, including sheet-metal screws, used to secure electrical or enclosure component parts in place or together, shall comply with the self-threading screw torque test in Clause 16.14, when the screw threads into nonferrous metal or polymeric material.
+ Y1 Y; ~, n3 h- _% V当自螺纹螺丝和铁板牙螺丝用来固定电气或外壳部件在一起时,且这些螺丝是拧入非铁金属或聚合物材料时,这些螺丝就要符合这个测试要求;
6 I( w. j" ?$ T+ \, Z! O5.10.3 A self-threading or sheet metal screw used for mounting or supporting a part that weighs more than 3.4 kg (7.5 lb) per screw shall comply with the self-threading screw torque test in Clause 16.14.5 [* G t% D, @# _4 h
当自螺纹螺丝或铁板牙螺丝用来安装或支撑重量超过每个螺丝3.4kg时,这些螺丝就要符合这个测试要求;2 J; T3 W$ G! T7 l+ I
2.测试的方法。( [) x: o+ ~' \
16.14.1 Self-threading or sheet metal screws may be used if threads are not stripped when the screw is tightened with a torque of 3.39 N·m (30 lb·in) and if the part or the assembly supported by the screw withstands for 1 min a force equal to four times the mass of the part or assembly, applied in a direction coincident with the axis of the screw.
0 V1 Z/ F- R* c$ u测试方法: 用3.39N.m(30lb.in)的扭力扭紧螺丝, 并在装配表面的螺丝轴向施加于四倍于装配物重量, 螺蚊应不受破坏。 |
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