请各位大侠谈谈ar上下机匣的材质对可靠性的影响

NorSunShine33

一直对AR机匣的材质比较困惑。一般说来军标都是7075锻铝，但也有6060锻铝和6060锻铝切削的，现在也有碳纤尼龙下机匣和钛合金上机匣。最近看大家追得billet 切削的上下机匣，材质也只是6060锻铝，他们到底有什么样的不同？为何某些billet 机匣价钱那么虚高？

在下买了枫叶国小厂NEA的billet 切削上机匣，发现其直线化的机加工方式让某些角落的材料多了一点，也许这就能增加理论强度？ 不过这个机匣在前方和后方没有进行足够的切削，以至于我需要把receiver clamp挫掉一点才能左右合十。
在尝试装utg pro super slim hand guard的时候，还需要和上机匣接触的上下两个角挫掉一些，而跟ＤＰＭＳ的ｕｐｐｅｒ则是完美结合。

brucewayne

billet的好处主要是美观、一体trigger guard、组装容易、有的有特殊功能比如ambi、tension screw、扩大的弹匣口，一般来说并不增加强度

Vltor是7075锻造铝 https://www.vltor.com/shop/featured/mur-modular-upper-receiver/
Rainier也是7075 http://www.rainierarms.com/raini ... wer-combo-set-mod-2
billet也可以轻量化，比如BAD

http://www.battlearmsdevelopment ... -lower-receiver-set

NorSunShine33

据说7075偏脆，6060比较抗冲击一些，这种说法有根据吗？

PekingDeagle

NorSunShine33 发表于 2015-1-1 16:28
据说7075偏脆，6060比较抗冲击一些，这种说法有根据吗？

没有。厂家选6061的唯一目的是加工方便，成本低。

X-PGH

这有文字 - 看看就明白了:


http://www.ammoland.com/2014/08/ ... inum/#axzz3NceeNTl4



http://www.ar15.com/forums/t_3_118/410640_Forged_vs__Billet.html



Forged is typically a piece of material that is smashed into a shape while it is red hot (when referring to a shaped object for rough or final product).
The grain structure of the metal material will follow the shape of the unit being produced.
(ETA: forged material can also have no particular shape to make forged blank material to be machined into smaller pieces but retaining the strength of the initial forge)

Billet is a more general term used to describe a piece machined from a chunk of material/metal.
The original piece is most likely some sort of casting or drawn out, formed piece of metal.

X-PGH

6061 vs 7075 Aluminum: What’s the Difference

http://www.ar-15lowerreceivers.c ... m-whats-difference/

PekingDeagle

X-PGH 发表于 2015-1-1 17:21
6061 vs 7075 Aluminum: What’s the Difference

http://www.ar-15lowerreceivers.com/6061-vs-7075-alumi ...

that link got the machinability wrong. for indepth analysis you need to look up a more reliable source.

http://cdn.intechopen.com/pdfs-wm/13408.pdf

journey

7075 Tx 比6061-Tx 更结实。具体哪个数据更好想不起来了， 但单位有很多资料，等我放完假去单位看一下mspds再回来回报。6061-t4, t6是commercially available. 说白了，是价钱比7075-T x 更便宜。
同重量的forge 要比billet 更结实，这个和grain有关系。
billet lower 就是为了一些非标准的feature才有价值。如果不需要新奇的功能，没必要花大价钱买billet lower.

davidd

学习