DESIGNING FOR THE DMLS PROCESS JONATHAN BISSMEYER Senior Quality Engineer
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1 DESIGNING FOR THE DMLS PROCESS JONATHAN BISSMEYER Senior Quality Engineer
2 ABOUT PROTO LABS
3 OUR EQUIPMENT Concept Laser M2 and Mlab machines
4 DESIGNING FOR DMLS Not a replacement for traditional machining, casting, sheet metal fabrication or metal injection molding (MIM)
5 DESIGN GOALS FOR DMLS Reduction of components Reduction of weight Quicker assembly times Reduction of cost Complexity
6 DESIGN GOALS FOR DMLS Complex geometries
7 CASE STUDY: HUGE DESIGN Urban utility bike, EVO Allows riders to easily attach and detach different components
8 CASE STUDY: HUGE DESIGN DMLS was used to create the lugs, crankset shell and fork crown
9 DESIGN LIMITATIONS
10 SMALL FEATURE RESOLUTION Minimum feature size: mm (0.006 in.) Mesh structures
11 THIN WALLS (<1 mm/0.040 in.) Rule of thumb: 40 : 1 height : wall thickness
12 SURFACE ROUGHNESS Material Build parameters Part orientation
13 SURFACE ROUGHNESS Machine Concept Laser M2 (250 mm) Material Stainless Steel (316L) Titanium (Ti64 ELI) Aluminum (AlSi10Mg) Vertical Sidewall (Ra) Angled Upfacing Surface (45 ) (Ra) Upfacing Surface (Ra) Angled Downfacing Surface (45 ) (Ra) Inconel Concept Laser Mlab (90 mm) Stainless Steel (316L) Stainless Steel (17-4 PH) Cobalt Chrome
14 SUPPORTS Connect the part to the platform Hold features in place Photo courtesy Concept Laser Prevent warping
15 SUPPORT removal process Can be intensive and may require machining, EDM Photo courtesy Concept Laser Design tip: Design parts that will require minimal supports. This will also improve part quality
16 DESIGN CONSIDERATIONS
17 INTERNAL FEATURES Channels, overhangs, self-supporting angles, bridge dimensions Support and powder removal access Design tip: Lattice structures can be used internally to reduce weight and provide support
18 SELF-SUPPORTING ANGLES CAD 50 degrees 45 degrees 40 degrees 35 degrees 30 degrees 25 degrees 20 degrees
19 OVERHANGS If the next layer is larger than the previous layer, it will create an overhang DMLS has a small allowance for unsupported overhangs (0.5 mm/0.020 in.)
20 CHANNELS AND HOLES Channels and holes are self-supporting features Great for conformal cooling applications
21 CHANNELS AND HOLES As the diameter increases, the overhangs increase 15mm (.6 ) 12mm (.47 ) 8mm (.31 ) 6mm (.24 ) 5mm (.2 )
22 BRIDGES Minimum allowable unsupported bridge distance is small (~2 mm/0.080 in.) 1mm 2mm 3mm 4mm 5mm
23 INTERNAL STRESSES WARPAGE Changes in crosssectional areas can lead to warpage Large flat surfaces can bend build plates and shear bolts Design tip: Design in additional material to gradually transition into larger cross-sections
24 DESIGN EXAMPLE: REV 1 Three-component assembly Supports!
25 DESIGN EXAMPLE: REV 2 Reduction of components/assembly time/weight BUT
26 DESIGN EXAMPLE: REV 3 Best surface finish, small warpage potential Self-supporting features eliminate need for most supports
27 PROTOTYPING OR PRODUCTION DMLS is also a low-cost, quick-turn method for prototyping components using actual end-use materials OPTIMIZE DESIGN DMLS can be a production method for complex geometries HIGHER VOLUME
28 CASE STUDY TRANSITION TO CONVENTIONAL MFG Total Cost (Tooling + Parts) Breakeven point DMLS Cost MIM Part Quantity
29 CONCLUSION DMLS opens up new design options, but it will not replace conventional manufacturing methods Understanding constraints will maximize benefits of DMLS for part design QUESTIONS?
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