機身零件絕大多數(shù)采用鋁板，傳統(tǒng)上，使用7000系列鋅基鋁合金來進行加工，這是因為該合金具有良好的靜止力度和疲勞強度。雖然7000系列鋁材料很適合航空應(yīng)用，但是它們不耐高溫。
Most of the body parts are made of aluminum plate, and the traditional 7000 series zinc based aluminum alloy is used for processing. The reason is that the alloy has good static strength and fatigue strength. Although the 7000 series of aluminum materials are suitable for aviation applications, they are not resistant to high temperature.
快速加溫，如焊接和激光切割等操作，會導(dǎo)致微裂痕。微裂痕導(dǎo)致疲勞強度的降低。焊接和激光切割是兩種產(chǎn)生熱致微裂痕的加工。長時間以來，在7000系列鋁板的加工中，激光器的優(yōu)勢一直由于疲勞性能的降低而未能得到發(fā)揮。
Rapid heating, such as welding and laser cutting, can cause micro cracks. Micro cracks lead to lower fatigue strength. Welding and laser cutting are two processes to produce thermally induced microcracks. For a long time, the advantage of the laser has not been brought into play since the reduction of the fatigue performance in the processing of the 7000 series aluminum plate.
疲勞斷裂通常發(fā)生在應(yīng)力集中的地方，如零件的邊緣，幾何形狀變化處，或者接合處。薄板金屬制成的機身零件有很多不同的接合方式，絕大多數(shù)的疲勞裂痕發(fā)生在接合處。如果激光沒有被用于切割接合處的小孔，那么激光主要就用于零件的邊緣切割。
Fatigue fracture usually occurs in the stress concentration area, such as the edge of the part, the geometric change, or the joint. The fuselage parts made of sheet metal have many different ways of joining, and most of the fatigue cracks occur at the joints. If the laser is not used to cut holes in the joint, the laser is mainly used for the edge cutting of the parts.
對于其它的效應(yīng)，可以采用最易損壞的連接位置來說明與連接處相比，激光切割帶來的微裂痕幷非主要的損壞部位。這樣，我們就能得出結(jié)論：如果一個零件有可能在連接處斷裂，那么激光切割技術(shù)不會進一步損壞零件的疲勞特性。
For the other effect, can use the most easily damaged to illustrate the connection position compared with the connection, laser cutting caused by micro cracks and damaged parts of the main. In this way, we can conclude that if a part is likely to fracture at the joint, then the laser cutting technique will not further damage the fatigue characteristics of the parts.

更重要的是在激光切割過程中，技術(shù)人員已經(jīng)可以對切割參數(shù)進行控制，幷且利用計算器軟件進行精確的重復(fù)。這些技術(shù)進步使得人們對激光切割是否適用于機身結(jié)構(gòu)的生產(chǎn)重新思考。今后的機身系統(tǒng)以及現(xiàn)有的設(shè)計不應(yīng)因為過去的經(jīng)驗而排除激光器在該機身系統(tǒng)中的可能應(yīng)用。我們應(yīng)該保持冷靜的頭腦與開放的態(tài)度來分析各種情況，以確定激光技術(shù)在航空制造業(yè)中是否可以帶生產(chǎn)效益。

It is more important in the laser cutting process, technical staff has to control the cutting parameters, and accurately repeated use of the calculator software. These technological advances have led to a rethink of whether laser cutting is suitable for the production of airframe structures. Future airframe systems and existing designs should not be excluded from possible applications of the laser in the airframe system due to past experience. We should keep a cool head and an open attitude to analyze the situation in order to determine whether laser technology can bring production benefits in the aviation manufacturing industry.
因此，金屬激光切割機在切割7000系列鋁材時，對質(zhì)量和加工控制是至關(guān)重要的。任何給加工帶來不確定因素的過程都必須加以控制或者直接排除。
Therefore, the metal laser cutting machine is very important for quality and process control when cutting 7000 series aluminum material. Any process that brings uncertainty to the process must be controlled or ruled out directly.
不過，在目前的金屬激光切割系統(tǒng)中，這些激光切割在航空應(yīng)用中的局限性都得到改進，這些局限性包括疲勞性能和制造過程一致性降低的問題?，F(xiàn)在，激光系統(tǒng)在很大程度上減小了熱影響區(qū)域的大小和相應(yīng)的微裂痕。
However, in the current metal laser cutting system, the limitations of these laser cutting applications in aviation have been improved, and these limitations include fatigue performance and manufacturing process consistency reduction problem. Now, the laser system greatly reduces the size of the heat affected zone and the corresponding microcracks.
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