Drill Base Body Fabricated with Additive Manufacturing Technology: Structure, Strength, and Reliability

PIOTR TYCZYNSKI, ZBIGNIEW SIEMIATKOWSKI, MIROSLAW RUCKI

Abstract


The paper presents an investigation of results on an additive manufactured drill base body. Due to the technological and strength limitations, conventional drills with inner coolant ducts may not be smaller than 13 mm diameter. The novel idea was to keep the strength of small diameter drills making spiral coolant ducts. Drills were fabricated using a 3D laser printer to obtain the designed geometry in a way not affecting its stiffness and strength. The tensile strength of samples was between Rm = 1287 and 1603 MPa, and microhardness of drills was between 606 and 627 HV5. The sintered material revealed a very small porosity rate (below 1%) and very few discontinuities. Thus, it was demonstrated that the 3D laser printing enabled the production of advantageous drill base bodies.

Keywords


additive manufacturing, selective laser melting, porosity, drilling, drill body design, coolant ductsText


DOI
10.12783/dtcse/fe2019/30677

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