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首页> 外文期刊>Journal of Materials Engineering and Performance >Innovations in the Superplastic Forming and Diffusion Bonded Process
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Innovations in the Superplastic Forming and Diffusion Bonded Process

机译：超塑成型和扩散粘结工艺的创新

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The Superplastically Formed and Diffusion Bonded (SPF/DB) titanium structure in production today for Boeing products, not including engines, are all diffusion bonded using matched metal tooling and are all fabricated using the common 6Al-4V alloy. The matched metal tooling concept presents a challenge in obtaining high-quality bonds over large areas due to tolerance build-up in the tools and the titanium sheets. Boeing Commercial Airplanes (BCA) is currently advancing the state of the SPF/DB process in several ways. One of these advances is using stop-off between the sheets and diffusion bonding the pack first and then superplastically forming the stiffening features. This generates a component that is very well bonded in the required locations. However, this process also has its challenges. One of these involves how to apply the stop-off material in the proper location using the most cost effective process. Historically, silk screening has been used to define the required pattern for the stop-off material. This process requires several pieces of equipment including a wash booth since the screen needs to be cleaned after each part. A paper maskant and laser scribing process has been developed for defining the stop-off pattern. Also, because diffusion bonding is performed first, when the component is superplastically formed, there is a tendency to form creases on the surface of the part. Methods have been developed to eliminate these surface creases on the unformed surface. Another advance in the SPF/DB process is in the titanium alloys being used for products. A fine grain 6Al-4V material has been developed that bonds and forms at 775 °C. The use of this material will minimize wear on the tools and presses as well as significantly reducing the amount of alpha case on the part surface.
机译：目前，波音产品（不包括发动机）生产的超塑性成形和扩散结合（SPF / DB）钛结构均使用匹配的金属工具进行扩散结合，并且均使用普通的6Al-4V合金制造。由于工具和钛板的公差增加，匹配的金属工具概念对在大面积上获得高质量的粘结提出了挑战。波音民用飞机公司（BCA）目前正以几种方式推进SPF / DB进程的状态。这些进步之一是利用片材之间的挡块并首先扩散粘合包装，然后超塑性地形成加固特征。这样会生成一个在所需位置上粘合得很好的组件。但是，此过程也有挑战。其中之一涉及如何使用最具成本效益的工艺在适当的位置施加阻隔材料。从历史上看，丝网印刷已被用来定义挡料所需的图案。此过程需要几台设备，包括一个洗手间，因为每个部分之后都需要清洁筛网。已经开发出一种纸掩蔽剂和激光划片工艺，以定义停止图案。另外，因为首先进行扩散接合，所以当超塑性地形成部件时，存在在部件的表面上形成折痕的倾向。已经开发出消除未成形表面上的这些表面折痕的方法。 SPF / DB工艺的另一个进步是用于产品的钛合金。已经开发出一种细晶粒的6Al-4V材料，该材料会在775°C的温度下粘合并形成。使用这种材料可以最大程度地减少工具和压力机的磨损，并显着减少零件表面的Alpha含量。

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