Surface texture metrology for metal additive manufacturing: a review

A comprehensive analysis of literature pertaining to surface texture metrology for metal additive manufacturing has been performed. This review paper structures the results of this analysis into sections that address specific areas of interest: industrial domain, additive manufacturing processes and materials; types of surface investigated; surface measurement technology and surface texture characterisation. Each section reports on how frequently specific techniques, processes or materials have been utilised and discusses how and why they are employed. Based on these results, possible optimisation of methods and reporting is suggested and the areas that may have significant potential for future research are highlighted

Data for: Experimental investigation on a new hybrid laser process for surface structuring by vapor pressure on Ti6Al4V

Measured structure heights and dimensions for dual laser beam processing

Data for: Investigation on the mechanism of surface structure formation during laser remelting with modulated laser power on tool steel H11

This zip-file contains supplemental material regarding high speed videos and results from FEM modelling. Further instructions can be found in the readme file and in the corresponding protocols

Data for: Influence of laser polishing on surface roughness and micro-structural properties of the remelted surface boundary layer of tool steel H11

This is a zip-file which consists of raw and processed data subdivided in several folders. The substructure is almost self-explanatory. The folders contain data from cross-sections, Electron Backscatter Diffraction, Glow Discharge spectroscopy, hardness measurement (surface hardness and nanoindentation), Light microscopy images, roughness measurements by Hommelmeter and white light interferometry, Scanning electron images and X-Ray DiffractionTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Data for: Experimental investigation on a new hybrid laser process for surface structuring by vapor pressure on Ti6Al4V

Measured structure heights and dimensions for dual laser beam processing.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Data for: Investigation on the mechanism of surface structure formation during laser remelting with modulated laser power on tool steel H11

This zip-file contains supplemental material regarding high speed videos and results from FEM modelling. Further instructions can be found in the readme file and in the corresponding protocols.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Laser polishing in medical engineering: Laser polishing of components for left ventricular assist devices

Cardiac surgery has made significant progress during the last 50 years. nowadays, almost every congenital or contracted dysfunction of the heart can be treated clinically or at least the etiopathology can be alleviated. During these years, implantable Left Ventricular Assist Devices (LVADs) have proven to be an effective and reliable medical product. In particular, the survival rate of patients with cardiac insufficiency has risen due to these devices. This type of heart-assist device is implanted either to bridge the time until cardiac transplantation or recovery has occurred, or for permanent implantation in the patient's body. Berlin Heart GmbH produces the clinically tested axial pump system INCOR® (Figure 1, above). The INCOR heart-as-sisting pump is a powerful implantable LVAD which has been used in more than 500 clinical applications. The main function of the axial pump is to unload the patient's heart by transporting blood from the left ventricle to the aorta. In order to assure high reliability of the pump's operation, the components used for blood transport have to be highly bio- and hemocompatible

Design surfaces by laser remelting

Molds and dies are used today in the manufacturing of a wide range of industrial products. They have a broad field of applications from the air and space technology, the automotive sector, to electrical engineering, to household products and consumer goods. The surface of a part or product strongly influences its properties and functions e.g. it's visual appearance. The gloss thereby reflects one of the most important properties of a surface when it comes to evaluate the visual appearance. Therefore, among others, in this paper the influence of laser polishing on the generated specular gloss is investigated for the hot work steel 1.2343 (AISI: H11). On the one hand laser polished surfaces are measured by WLI and investigated by a spectral analysis of surfaces roughness. A spectral analysis is achieved by a discrete convolution of the surface profile with a Gaussian loaded function similar to ISO 11562. On the other hand specular gloss measurements were carried out at 20°, 60° and 85°. For the experiments a fiber‐coupled solid state disc laser (Yb : YAG; Q‐switched) is used (PL,max = 550 W; repetition frequency: fP = 5–20 kHz, pulse duration: tP = 0,7–3,5 µs, pulsed and cw‐operation). In general, scanning velocity and average laser power are two crucial procedural parameters for laser polishing with significant influence on the resulting surface roughness. These procedural parameters are investigated systematically, while other procedural parameters, such as laser beam diameter dL = 250 µm and track offset dy = 25 µm were kept constant. By this a significant reduction of roughness was achieved, especially for the wavelength interval λ < 320 µm. A correlation between specular gloss of surfaces and the measured micro‐roughness is carried out. In order to make a systematic classification laser polished fields are compared to surfaces which were prepared by conventional mechanical manufacturing processes, such as turning, milling, grinding, high end manual polishing etc. Specular gloss shows a good exponential correlation with micro‐ and meso‐roughness were as macro roughness shows no significant influence on the specular gloss. Additionally, a complete process chain for selectively laser polishing of metallic surfaces was developed in order to apply different levels of gloss onto free formed work pieces. Selective laser polishing and the process chain are demonstrated for a free formed tool insert with leather textured surface, where only the indentations of the leather texture were laser polished selectively