[H]ýӴӦ dݿϵ ZEϵ ZHڵϵ Zšغ϶ϵ ȡСת T1?5N?m
غϵ غƽȣȡK?1.2 ݿϵ ??0.6 Ħϵ u?0.03 ýӴѹ [?H]??Hlim?ZnSHlim
ͼֵĽӴƣͼ?Hlim?300MPa
ӴǿȵСȫϵSH?1.6
ӴƣǿȼϵZN?1
lim[?H]??Hlim?ZnSHlim?300?1?187.5MPa 1.6ϵ ZE?189.8E/MPa ڵϵ ZHغ϶ϵ Z?ϲ빫ʽ
?2.5
?1.5
2?1.2?51.03189.8?2.5?1.52??()?21.4mm
0.60.03187.5d1?33.4.3 ȷֵҪҪߴ
ȡZ1?30Z2?i?Z1?90 ģ m?d1?23/30?0.78mmȡֵm?1mm Z1ľ ľ a?Ҫߴ
11mZ1?Z2)??1?120?60mm 22ֶԲֱD1?mZ1?1?30?30mm D2?mZ2?1?90?90mm
ݶԲֱDa1?D1?2m?30?2?32mm
Da1?D1?2m?90?2?92mm
ݿȡݿϵ?d?0.6 b??dd1?0.6?30?18mm
3.4.4 У˳ݸƣǿ
ݸƣǿУ˹ʽʽ(3.4)ʾ
?F?2KT1bdYFaYSaY??[1m?F] ʽ Kغϵ
T1Сתأ
bֳݿ YFaϵ YsaӦϵ Y?5غ϶ϵ
ȡغϵ K?1.2 Сת T1?5N?m
ֳݿ b?18mm غ϶ϵY??1.5 ϵ YFa?2.3 Ӧϵ Ysa?2.6
?F?2?1.2?5?10324?30?1?2.3?2.65?1.5?152.375MPa
Ӧ㹫ʽʽ3.5ʾ
[?FlimF]??YNYXSFmin ʽ
Flimֵijݸƣͼޣ
SFminƣǿȵСȫޣ YNƣǿȼϵ YXߴϵ ȡֵijݸƣͼަ
Flim =400MPa
ƣǿȵСȫSFmin=1.4
ʽ(3.4) ʽ3.5
ƣǿȼϵYN=1 ߴϵYX=0.8
[?F]?ݼ㣬
F[F]
300?1?0.8?171.43MPa
1.4Գֳݸǿ㹻
3.5 ϸ˴
ϸ˴ڿռ佻䴫˶ͶһִļнǿΪֵõΪ90㡣ϸ˴ڽ䴫˶Ͷϸ˴ϸ˺ɣһϸΪϸ˺һ֮ϸ˴ֱΪϸ˺ϸˡϸֻһߵijΪͷϸˣϸתһܣתһݣϸߣͳΪ˫ͷϸˣϸתһܣתݡϸ״IJͬɷ֣Բϸ˴ϸ˴ϸ˴
ϸ˴ص㣺ȴṹաϸͷZ1ʾһZ1=1~4ֳZ2ʾӴȹʽI=Z2/Z1ԿZ1=1ϸΪͷϸתZ2תֲתһתɵõܴȣһڶУȡI=10-80ڷֶȻУIɴ1000ĴóִҪȡ༶Уϸ˴ṹգСᡣ ƽȣΪϸ˳ϵݣֳʱϵģϸ˳ûн˳ϵḶ́˹ƽȣСϸ˴ԡϸ˵ǺСʱϸֲִֻܴܴϸתϸ˴ЧʵͣһΪϸ˴Чʱȳִ͡ǾԵϸ˴Ч0.5£һЧֻ0.70.9ĥ𣬳ɱߡ
3.5.1 ϸ˴
ǰѡ֪T=5N2mϸ˴趨Ϊi=120Чʦ=0.8հÿ300ռƣΪ10ꡣ
ݱδڻϵĹ̨崫Ҫȸߣϸ˲ýϸˣ崫ҪƱȽϴϸ˵ĴҲȽϴҹ̨ڹҪܣϸ˲õͷϸˣΪ˹̨ڹҪƽ빤ƽȣϸ˵
3.5.2 ϸ˵IJ
ǵϸ˴Чʲٶֻеȣϸ45Ÿ֣ΪﵽߵЧʺõĥԣҪϸӲΪ45-55HRCͭZCuSn10Zn2졣Ϊ˽ԼصɫȦͭ죬оûHT100졣
3.5.3 Ӵƣǿ
ݱʽϸ˴ȰӴƣǿȽƣУ˳ݸƣǿȡľʽʽ3.6
a?3kT2(ʽ T2תأ k ʹϵ ZEϵ ZѡӴϵ [H]Ӧ ȷϵתT2
Z1=1ȡЧʦ=0.9
ZEZ?[?H])2 ʽ3.6
T2?T???i?5?0.9?360?1440N?m
ȷغϵk
غɽȶȡغɷֲϵK=13-2ʹϵKAѡȡKA=1.15תٲߣȡϵKV=1.2
K?KA?K??KV?1?1.15?1.11?1.265?1.27
3-2 ʹϵ KA ƽ ƽ еȳ س 1.00 1.10 1.25 1.50 1.25 1.35 1.50 1.75 еȳ 1.50 1.60 1.75 2.0 س 1.75 1.85 2.0 2.25
ȷӰϵZE
ѡõֺͭϸ䣬3-3ɲZE=152