SHORT HISTORY
……NOT THE FIRST …..
THE FIRST NON-MONOLITHIC OR “ASSEMBLED” NOZZLE WAS PROBABLY RELEASED BY OLSSON FIRM : THE OLSSONRUBY NOZZLE.
THIS NOZZLE USES, AS TIP, A SYNTHETIC RUBY WITH AN EXTERNAL CONICAL SHAPE AND AN INTERNAL CYLINDRICAL HOLE THAT CROSSES THE ENTIRE CONE.
MAYBE THE ONLY DEFECTS OF THIS NOZZLE ARE THE LOW THERMAL CONDUCTIVITY OF THE ARTIFICIAL RUBY AND, MAYBE, THE IMPOSSIBILITY, AS WE WILL SEE FURTHER, TO GIVE IT A CORRECT “SHAPE”.
IN ANY CASE, HAVING THE LAST SECTION OF THE NOZZLE MADE OF A MONOLITHIC MATERIAL WITH A HIGH HARDNESS IS ABSOLUTELY RIGHT:
AT THE OUTLET, THE REPENTINE CHANGE OF SECTION, IN PARTICULAR FROM A DIAMETER OF 1.75 OR 2.85MM TO 0,2-0,3-0,4-0,5-0,6-0,8 ETC. MM , DETERMINES AN INCREASE IN SPEED AND, CONSEQUENTLY, ALSO IN THE TEMPERATURE, OF THE FLUID, IN PROPORTION TO THE RATIO OF THE AREAS CONSIDERED, THEREFORE VERY IMPORTANT.
IN THAT POINT, MOREOVER, THE CROSS SECTIONS OF THE NOZZLE BECOME REALLY SMALL AND THE PHENOMENA OF WEAR BY EROSION, VERY IMPORTANT.
THIS, IN GENERAL, FOR ALL MATERIALS AND, IN PARTICULAR WAY, FOR THOSE LOADED WITH ABRASIVE MICROFIBERS SUCH AS CARBON, GLASS, KEVLAR OR OTHER WHISKERS, WHICH TEND TO WORSE BOTH THE “EFFORT” OF THE EFFLUX DUE TO THE EROSION PHENOMENA RELATED TO MICROPARTICLES WITH A HARDNESS GREATER THAN THE MATERIAL OF THE NOZZLE.
IN THIS WAY THE DURATION OF MONOLITHIC NOZZLES MADE IN VARIOUS MATERIALS, INCLUDING SURFACE TREATMENTS, CANNOT CERTAINLY MEET THE NEEDS OF A PROBLEM-FREE PRINT.
REGARD TO SURFACE HARDENING TREATMENTS, I THINK IT IS AN “ENERGY” PROBLEM: THE DIFFERENT QUANTITY OF ENERGY CHARACTERISTIC OF A “COATING” COMPARED TO CHARACTERISTIC OF THE INTERCRYSTALLINE FORCES OF A MONOLITHIC MATERIAL
BEYOND A LIMITED DURATION, IT IS POSSIBLE TO HAVE CLOGGING EVENTS WICH ARE REALLY ANNOYING, AND NOT ONLY RELATED TO MATERIALS WITH ABRASIVE CHARGES.
EVEN THE TRANSFER FROM MATERIALS OF DIFFERENT NATURE CAN MAKE THE OPERATION CONDITIONS WORSE, AT LEAST, FORCE MACHINE STOPPED TO REPLACE DEDICATED NOZZLES.
ANOTHER EXAMPLE IS THE SWITCHING FROM DIFFERRENT TYPES OF MATERIALS, FOR EXAMPLE FROM ONE WITH AN HIGHER EXTRUSION TEMPERATURE, TO OTHERS WITH THE SAME LOWER: THE REPLACEMENT OF THE FILAMENT IS NOT ALWAYS GOOD.
HERE, MAYBE ALL TYPES OF CURRENTLY NOZZLE:
https://www.matterhackers.com/s/store?q=NOZZLE
https://all3dp.com/2/3d-printer-nozzle-size-material-what-to-know-which-to-buy/,
https://www.3djake.it/stampanti-3d-ricambi/ugelli-di-ricambio-per-stampanti-3d
AS END- USER FIRST, AND INNOVATOR THEN, I WAS WONDERING IF IT WERE POSSIBLE TO HAVE A QUIET, UNINTERRUPTED WORKFLOW, AT LEAST, ABOUT THIS TOPIC.
3D FDM Experiments&Innovation 