A pilot study to assess an in-process inspection method for small diameter holes produced by Direct Metal Laser Sintering - Publication - MOST Wiedzy

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A pilot study to assess an in-process inspection method for small diameter holes produced by Direct Metal Laser Sintering

Abstract

Purpose The purpose of this research is to evaluate the geometric quality of small diameter holes in parts printed by DMLS technology. An in-process optical inspection method is proposed and assessed during a pilot study. The influence of the theoretical hole diameter assumed in a CAD system and the sample thickness (hole length) on the hole clearance was analysed. Design/methodology/approach The samples made of two different materials: EOS MaragingSteel MS1 and aluminium alloy EOS Aluminium consisted of straight through holes of different diameters and lengths. Dimensional and shape accuracy of the holes were determined with the use of the image processing software and the computer analysis of 2-D images. The definition of the equivalent hole diameter was proposed to calculate the hole clearance. Feret’s diameters were determined for the evaluation of the shape accuracy. Findings The dependency between the equivalent hole diameter and the theoretical diameter was approximated by the linear function for a specific sample thickness. Additionally, a general empirical model for determining the hole clearance was developed, allowing for calculating the equivalent hole diameter as a function of a sample thickness and a theoretical hole diameter. Practical implications Developed functions can be used by designers for a proper assignment of a hole diameter to achieve the required patency. The relevant procedures and macros based on proposed empirical models can be embedded in CAD systems to support the designing process. Originality/value The analysis of the geometric quality of the holes in parts printed by DMLS was based on the computer analysis of 2-D images. The proposed method of assessing the shape accuracy of straight through holes is relatively cheap, is widely available and can be applied to the features of other shapes produced by 3D printing.

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Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
RAPID PROTOTYPING JOURNAL no. 26, pages 418 - 436,
ISSN: 1355-2546
Language:
English
Publication year:
2020
Bibliographic description:
Deja M., Zieliński D.: A pilot study to assess an in-process inspection method for small diameter holes produced by Direct Metal Laser Sintering// RAPID PROTOTYPING JOURNAL -Vol. 26,iss. 2 (2020), s.418-436
DOI:
Digital Object Identifier (open in new tab) 10.1108/rpj-05-2019-0132
Bibliography: test
Verified by:
Gdańsk University of Technology

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