VTT Pipe case study

 

​Background

A mock-up SLM test component was designed at VTT for assessment of printability and geometric accuracy both before and after machining. Design principles and objectives included:

  • Features suitable for SLM, e.g. self-supporting elliptic cross-section for horizontal pipe, ribs and local details to modify overhanging members to be self-supporting
  • Inclusion of features challenging to manufacture by SLM that are common in industrial components, e.g. thick sections and overhangs
  • Smooth transitions used at corners for good fatigue strength
  • Only functional surfaces are designed to be machined
  • Bolt holes are reamed using pre-fabricated holes
  • Dimensions limited so component can be produced in SLM125HL chamber

 

 

Click images to enlarge.

 

Experimental Approach


At VTT we have printed this part several times with variations in material, process parameters, and the upper collar support design. Experimental data was collected during and after printing for use in:

  • Improving design approach
  • Optimizing print process parameters
  • Testing the ability of AM process simulation software to predict thermal build-up and distortions during and after the build, as well as component stress state of the component as-built and after post-treatments.

 

  

 

 

 

Click images to enlarge. 

Knowledge Sharing

In order to encourage knowledge sharing and an open approach to research in this field, VTT would like to offer this case to others who would like to use it for experimental work or AM process simulation validation. Please find step file geometries for the two design variations described in the previous text and images as having print IDs 171 and 172. For additional information, please contact the persons listed in the Contact Us box.

The geometry design files are free to download but when used VTT must always be credited as the source.

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