【龙腾网】带你见识制造业幕后的原理-编号1254【交通信号灯】

正文翻译
原创翻译：龙腾网 http://www.ltaaa.com 翻译：山东姐妹 转载请注明出处

Traffic-signal poles must be strong enough to bear the weight of road signs,street lights,and,of course,traffic signals.

交通信号杆必须足够坚固，以承受路标、路灯、以及交通信号灯的重量。

The poles are also built to withstand extreme weather conditions,such as high wind sand heavy snow accumulation.

灯杆同时也要能够抵御极端恶劣天气环境，比如大风，比厚厚的积雪。

Traffic signal poles are made of high-strength steel.

交通信号杆是用高强度钢材制成的。

Years of weather exposure can cause corrosion,so the poles are galvanize don both sides for protection.

常年的暴露可能会腐蚀钢材，所以电线杆要镀锌以防止腐蚀。

The machine cuts the sheet into a rectangular shape,or a trapezoid shape if the pole will taper at the top.

机器把钢板切割成长方形，如果圆柱灯杆是顶部比较细的款式，那就切割成梯形形状。

Workers number the machine lines with chalk,giving lines directly opposite of each other the same number.

工人们用粉笔给每个记号编上数字记号，而相同的数字记号按照轴线对称排列。

Then they transfer the sheet to a bending machine called a press brake.

然后他们把钢板转移到一台叫做折弯机的折弯机上。

The press brake bends the sheet along the marked line to a preprogrammed angle.

折弯机沿标记线将钢板弯成预编程的角度。

Workers use a digital measuring device to make sure the first bend is accurate.

工人们使用数字测量装置来确认第一次弯曲的角度是否准确。

If it is,they continue bending along the remainder of the lines,transforming the flat sheet into a multisided round pole.

如果准确，工人们就继续沿着线的其他的标记线弯曲钢板，渐渐把平钢板弯曲成一个多面圆柱。

The factory ships the finished poles to a galvanizing plant,where they''''re dipped in a series of wash tanks.

工厂将成品灯杆运到镀锌厂，在那里灯杆被浸泡在一连串的洗涤槽里。

[copy]The plant''''s tanks are deep enough to fully submerge the poles so they can treat both the inner and outer surface at the same time.

工厂中的洗涤池足够深，可以完全浸没整个灯杆，这样池中溶液就可以同时处理灯杆的内表面和外表面。

Now the poles go into a vat of sulfuric acid.

现在杆子要被浸泡到一个装满硫酸的池子中。

This bath dissolves the more stubborn contaminants that washing can''''t remove.

池中硫酸可以溶解清洗之前无法去除的顽固污染物。

The next tank contains a chemical that weakens the surface of the poles.

下个池子会配有一能会化蚀灯杆表面的化学溶液。

This allows the galvanizing metal to penetrate the steel,rather than sit on the surface.

让镀锌金属离子能够穿透钢材，而不是停留在钢材表面。

The final tank contains molten zinc.

最后一个池子里是一池熔化了的锌水。

As the poles bathe in the 842-degree zinc,workers in fire-protection suits skim the surface to remove iron oxide and ash that floats to the top.

当灯杆浸泡到842度的锌水中时，穿着防火服的工作人员会清除漂浮在池面上的氧化铁和灰烬。

This keeps the freshly galvanized surface clean as the poles are hoisted out ofthe tank and set aside to cool.

这样可以让镀好锌的灯杆从842度的锌水池里吊出来放在一边冷却时，它的表面保持干净。

Because they''''re galvanized rather than painted,these poles are able to support traffic lights,signs,and street lamps for 40 years or more.

由于灯杆是镀锌的而不是油漆的，所以这些灯杆能够支撑交通信号灯、路标牌和路年至少40年时间。