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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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- 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
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- Ahuja, B., Karg, M., Schmidt, M. (2015), "Additive manufacturing in production: challenges and opportunities", In Laser 3D Manufacturing II. International Society for Optics and Photonics, Vol. 9353, p. 935304. open in new tab
- Aminzadeh, M. and Kurfess, T. (2015), "Layerwise automated visual inspection in laser powder-bed additive manufacturing", In ASME 2015 international manufacturing science and open in new tab
- Verified by:
- Gdańsk University of Technology
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