科研之友
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摘要
Press and sinter is a near net-shape technology, and its cost effectiveness is strictly related to the geometrical and dimensional precision of the component itself. In this work an analytical model to describe the dimensional variations due to the sintering process of iron components has been proposed and discussed.
This model has been developed using experimental data coming from a well designed sampling. The sampling is a set of axisymmetric geometries, rings and cylinders, having different diameters and heights. The different features (diameters and heights) have then been compared with the dimensional variations to study the influence of the geometry on the dimensional variations. Every sample has been measured both in the green state and after the sintering process. The dimensional variations concerning the diameters and the heights have been evaluated. The measuring procedure has been implemented using a coordinate measuring machine. The sintering process has been carried at three different temperatures under the same operating conditions.
The anisotropy of the dimensional variations has been studied and described within the proposed model, introducing the anisotropy parameter (K). Basically the parameter K identifies the difference between the dimensional variations occurring in an ideal isotropic volumetric change and the actual anisotropic volumetric variation. The model can describe the difference between the dimensional variations occurring on the compaction plane (diameters) and the dimensional variations occurring along the compaction axis (height). The effect of the geometry and the sintering temperature on the anisotropy of the dimensional variations has been evaluated.
- 出版日期2015-10
