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PEEN FORMING OF CERAMICS - A NEW CHIPLESS SHAPING TECHNIQUE

机译：陶瓷的喷头成形-一种新的辣椒成型技术

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摘要

Thin ceramic components are often distorted during production due to anisotropic shrinkage and/or residual stresses due to machining. If unwanted distortion is detected in a component in its final shape, the distortion cannot be eliminated by additional material removal. Such ceramic components are usually discarded since their brittleness does not permit further flattening. Ceramic parts with complex shapes must be fabricated by, for example, sintering close to the desired shape followed by a costly 3D machining process. This paper describes the first successful experiments aimed at shaping ceramic specimens using shot peening. Strips of different thicknesses made of silicon nitride ceramic were shot-peened using different shot peening parameters. The residual stress-depth distributions were determined using X-ray diffraction. Based on the experimentally-determined stress states, the curvatures of the strips were determined analytically and using Finite Element (FE) calculations. Silicon nitride flat springs and a concave mirror could be peen-formed without the need of additional hard machining. FE calculations demonstrated the capability of designing peen forming processes on basis of experimentally-determined peening stresses.
机译：由于各向异性收缩和/或由于机械加工引起的残余应力，薄陶瓷组件在生产过程中经常会变形。如果在组件的最终形状中检测到不需要的变形，则无法通过额外的材料去除来消除变形。通常将这种陶瓷部件丢弃，因为它们的脆性不允许进一步扁平化。具有复杂形状的陶瓷零件必须通过例如烧结接近所需形状，然后进行昂贵的3D加工工艺来制造。本文介绍了第一个成功的实验，该实验旨在使用喷丸处理使陶瓷样品成形。使用不同的喷丸处理参数对由氮化硅陶瓷制成的不同厚度的条进行喷丸处理。使用X射线衍射确定残余应力-深度分布。基于实验确定的应力状态，通过有限元（FE）计算分析确定带材的曲率。氮化硅平板弹簧和凹面镜可以通过尖头成形而无需额外的硬加工。有限元计算证明了根据实验确定的喷丸应力设计喷丸成形工艺的能力。

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