螺丝的破坏扭力标准

2025-01-23 17:45:29
推荐回答(4个)
回答1:

螺丝扭力标准○
一般螺丝螺丝规格
m2
m2.5
m3
m4
m5
标准扭力
1.6~2
3~4
6~7.5
14.5~18
28~35
(kgf・cm)○
自攻牙螺丝
螺丝规格
1.7
2
2.3
2.6
3
3.5
标准扭力
1.5
3
3
3
4
4
可以换算成国际通用的n.m,也就是牛米。1kgf.cm=0.098nm
扭力标准是怎么制定的?
先说一下我是怎么来做的
1.准备测试用具:电动起子,扭力计,机台,各种规格螺丝。
2.实际量测以不同扭力锁附各规格螺丝,并立即量测出退锁扭力值。退锁扭力应为锁附扭力值的60%或以上.
3.用扭力计直接测量出破坏扭力数值。破坏扭力数值即会造成滑牙,滑丝,螺丝断裂或螺丝头打花的扭力值
4.求出适当扭力数值。
ex:测出锁pcb板螺丝破坏扭力值为16kgf.cm,则适当扭力上限值为16/2=8kgf.cm,
故适当扭力值取7±1kgf.cm。
注:根据本厂内产品螺丝规格之特性,扭力值之安全系数取2,避免作业时因锁附,扭力值订的太大,而造成锁附时会偶滑牙,滑丝,螺丝头打花不良现象
.
5.验证适当扭力值之可靠性。
a.重复锁附,测量扭力值。
b.取用适当扭力值锁附之产品进行振动试验,检查螺丝有无松动,并用扭力计量测各螺丝退锁扭力是否大于或等于适当扭力值的60%.
螺丝扭力标准
目前常用之螺丝扭力标准
a
b
c
d
e
m3
8
8
6
10
12
m3.5
10
8
6


m4
16
12
8
20
22
m5
30
20
12


m6
50
30



m8
120
70



m10
240
140



m12
420
260



单位:kgf.cm;
容许误差:±10%
a、
铁螺丝与铁螺帽(螺孔)之固定,如:
*箱体各组件之组合。
*接地螺丝、螺帽之固定。
*pcb固定于箱体。
b、铁螺丝、铜螺帽(螺孔及铝合金材料螺孔之螺定,如:
*电晶体或线材端子固定于铝散热片上。
*铝散热片固定于pcb上。
*大电容或电晶体端子(terminal)之固定螺丝。
*rs-232六角铜柱之固定。
c、铁螺丝(自攻)锁于塑胶孔。
*塑胶面板固定于箱体。
*pcb固定于塑胶面板上。
d、铁螺丝(自攻)锁于板厚1.0之抽牙孔。
*m3
抽牙也为ф2.8(+0,-0.05)
*m4抽牙孔为ф3.65(+0.05,-0)
e、铁螺丝(自攻锁于板厚1.2之抽牙孔,抽牙孔尺寸同d项。

回答2:

标准是9.8N就可以了,不过用35ACR的材质,热处理后实际可以达到17-22之间是没有问题的。
扭矩:‍扭矩是使物体发生转动的力,活塞在汽缸里往复运动,往复一次做有一定的功,在每个单位距离所做的功就是扭矩。发动机的扭矩就是指发动机从曲轴端输出的力矩。在功率固定的条件下它与发动机转速成反比关系,转速越快扭矩越小,反之越大,它反映了汽车在一定范围内的负载能力。

回答3:

附1:一般螺纹联结拧紧力矩要求值一览表:(表4)
螺纹规格
类别及力矩值(N.m)
螺纹规格
类别及力矩值(N.m)
8.8级
10.9级
12.9级
8.8级
10.9级
12.9级
M4
3.0
4.4
5.1
M8X1
27
39
46
M5
5.9
8.7
10
M10X1.25
52
76
90
M6
10
16
18
M12X1.25
93
135
160
M8
25
36
43
M12X1.5
89
130
155
M10
49
72
84
M14X1.5
145
215
255
M12
86
126
145
M16X1.5
226
330
390
M14
135
200
236
M18X1.5
340
485
570
M16
210
310
365
M20X1.5
475
680
790
M18
300
430
600
M22X1.5
630
900
1050
M20
425
610
710
M24X2
800
1150
1350
M22
580
820
960
M27X2
1150
1650
1950
M24
730
1050
1220
M30X2
1650
2350
2750
M27
1100
1550
1800
M30
1450
2100
2450

回答4:

M8是9.2牛米

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