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Effect of In-Plane Anisotropy and Surface Anisotropy on Titanium Plate Formability | Alloy Wiki
Home » Titanium Guide » Effect of In-Plane Anisotropy and Surface Anisotropy on Titanium Plate Formability

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Effect of In-Plane Anisotropy and Surface Anisotropy on Titanium Plate Formability

Posted by: die casting 2021-09-12 Comments Off on Effect of In-Plane Anisotropy and Surface Anisotropy on Titanium Plate Formability
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1.Influence of in-plane heterogeneity on sheet formability

Different performances in different directions with respect to the rolling direction of the titanium plate, so that the deformation of the cylindrical forming part has become axisymmetric, and lugs have appeared on the forming part. In addition to the appearance of the lugs, the shape of the formed part does not meet the requirements (belonging to the conformity category), and the degree of allowable deformation is also unfavorable.

Effect of In-Plane Anisotropy and Surface Anisotropy on Titanium Plate Formability

Obviously, the appearance of the lugs on the cylinder-shaped part will inevitably cause the shrinkage and deformation in the direction of the cylinder to be unevenly distributed on the cylinder. The valleys are large, the lugs are small, and the valleys are more prone to unstable wrinkles or shears. Cut cracked. If the deformation is evenly distributed, such wrinkling or cracking can be avoided, or at least it will occur under a larger deformation.

The impact of the lug on the deformation is not only in the valley, but also in the direction of the lug; the performance is that the forming part is located in the direction of the lug and the material at the four corners of the die will be cracked. This is due to the width of the wool protruding line of the lug part, and the force required for further deformation must be larger. When it is large enough, the largest part of the force-the fillet of the die will be cracked.

Of course, for non-axisymmetric parts, according to the specific conditions of the part, the blanking orientation is appropriately selected, and the in-plane heterogeneity is used to turn it into a favorable factor, which can sometimes increase the allowable deformation.

The influence of heterogeneity on the conformal surface of the palatal plane is also manifested in curved parts. Due to the in-plane anisotropy of the material, that is, the nature of the principal strain direction does not always coincide with the direction of the principal stress, so that the bending line is not a bending piece consistent with the rolling direction or the transverse direction of the plate, it seems that it should not happen intuitively wry.

异 Titanium plate has significant adverse effects in the anisotropy, and it is particularly prominent in shape. Due to the different performance in different directions, even if the forming pair has the same stress, different springbacks will occur during unloading, which will cause the shape distortion of the formed part, that is, the original plane will warp.

2. The effect of surface heterogeneity on sheet formability

As mentioned above, the typical manifestation of surface anisotropy is that the stressed flat plate no longer maintains a flat surface and appears to be curved. Obviously, properly placing the wool during the forming process so that the forming curvature is consistent with the curvature caused by the surface anisotropy will facilitate the forming of the part and increase the allowable deformation degree; otherwise, it will reduce the allowable deformation degree. For example, TCIM material with a thickness of 1.5 mm has obvious surface anisotropy. When the round hole is flanged, if the side with a larger thickness anisotropy index is the inner surface of the flanging member, its limiting flanging coefficient can be higher than when it is on the outer surface. Big 2.8%.

Since surface anisotropy can produce undesired changes in curvature, it generally has a negative impact on conformability and settability.

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