Hi sosodef, unfortunately it's a general problem with Blender - Blender does not process the vertex normals smoothing information in the OBJ file, and because of this it tends to render CAD data with various kinds of shading artifacts.
That's pretty much a problem unique to Blender, every other rendering program that I know of is able to use vertex normals from OBJ files, so if you used a different rendering program that problem would go away.
There has been some talk by the Blender devs that this problem will be targeted to be solved in the next major Blender release, so once that release is out Blender should work better for rendering CAD data but right now it just does not really work very well for that purpose.
See here for some previous discussions on this:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4272.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=4515.3
- Michael
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