how to determine grain direction of aluminum

But, some small difference in mechanical properties. Second I was reading a manual for a large sander and it stated that the sanding belt must rotate towards the front of the sander for wood and away from the front of the sander for metal. Caution should be exercised in T6 temper applications where sustained tensile stresses are encountered, either residual or applied, particularly in the transverse grain direction. Thanks Patrick & Larry. A. Hi guys we are polishing aluminium with a grain satin finishing. Its VERY delicate, cannot stress that enough. new LazyLoad(); There are machines that do this finish on sheet material. With growth, each grain will eventually impact others and form an interface where the atomic orientations dif… Q. I am trying to find out how to brush aluminum to achieve my desired grain. "background": "#fff", They are far too slow and labor intensive to grain multitudes of parts. I have a piece of .080 inch 7075-T6 aluminum plate that has been polished. P.S. The fundamental relationships between grain orientation, deformation-induced surface roughness and strain localization in an aluminum alloy ... used to determine the set of ten displacements at which the sur-face conditions would be assessed. I think the loading and the embedding of aluminum particles was due to the fact the wide belt sander was designed for wood. Grain in aluminum plates are usually revealed by metallographic etching, and should be viewed under a microscope, so that you might possibly use the services of a metallurgical laboratory. Determining grain direction in 6AL4V titanium plate? We guarantee that your information will not be divulged to the third party. Just be sure and specify which direction you want the grain to go. The three orientations are: the long tranverse (LT), the short transverse (ST) and the longitudinal (L). Stroke sanders work OK, BUT primarily for items that have been fabricated 3D and the grain needs to match around corners, etc. The software determines the smallest rectangle (bounding box) that aligns with the grain direction to fit the flat pattern. Please let us know here why this post is inappropriate. Giving scratch finish or brush finish on aluminium has always been a headache. There is so much choice in sandpaper types, and I can't find recommendations on the web. Close this window and log in. Bending with the grain gives a different result than bending against it. By joining you are opting in to receive e-mail. I think that may be too slow for metal because all the major's like TimeSaver and AEM run about 3000 SFT. We have not been able to achieve a top quality finish with this alone. Precautions in use. If you want to specify the rolling direction on the sawn material, in the example below it will be 300 mm. P.S.. WE DON'T REALLY HAVE A PROBLEM WITH BELT LOADING UNLESS THE BELT IS SHOT OR TO MUCH PRESSURE. Grain Size Characterization of Aluminum Alloys. By studying the character, quantity, and distribution of these different features, metallurgists can predict and explain the physical properties and performance failures of … *Eng-Tips's functionality depends on members receiving e-mail. In this report, image analysis is used to determine the grain size distribution for seven specimens of anodized aluminum: three samples of Al + 1.0 Si, two of Al + 1.0 Si + 0.5 Cu and two others of Al + 0.5 Cu. If anybody knows of any other tricks, PLEASE post. Chat Now Send Inquiry; Aluminum sheet - Aluminum - ThyssenKrupp Aerospace. I need to know how to tell which way the grain runs. To achieve the best long line grain in aluminum you need a stroke sander and a 80G silicon carbide belt. ©1995-2020, Inc., Pine Beach, NJ   -   About   -  Privacy Policy Already a Member? My personal favorite is Timesaver brand but there are others such as Ramco that do an adequate job. As a general rule, the grain line must run perpendicular to the bend to avoid the potential for cracking or fracture. Which, by the way, is exactly why I asked the pros. The observation of the grain flow in this figure requires some special preparation methods. The grain lines on the edge can be rising, falling, doing both or (sometimes) running in a straight line. The clues to look for are on the edge adjacent to the surface you’ll plane.

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