Diamond grinding of carbide punches by grinding wheels with a multilayer composite electrolytic coating

The finish diamond grinding of a parabolic surface of a hard alloy punch with a grinding wheel with a multilayer composite electrolytic coating is considered. The cutting forces acting on a single grain are calculated. The cutting conditions that provide high tool life and the required quality of the machined surface are determined. Keywords diamond grinding, grinding wheel, multilayer composite electrolytic coating, quality, machined surface, cutting forces. [email protected]

Automatización de un prototipo de un equipo manual para recubrimiento electrolítico

Corrosion of materials is nowadays one of the problems in the industry. The aim of this article is to integrate an automated prototype electrolytic coating system and implement it in a furniture plant based at Chihuahua, Mexico. It is based on the study and development of the automation process of a manual coating machine with a Chrome bath, in order to reduce production costs, increase quality, and minimize the negative impacts in the workers’ safety. The prototype consists of a bank of PVC tubes and a power source; while automation is done through PLCs.

Determination of Hydrogen Transport Behaviour in Boron-Manganese Steels Using Different Methods and Boundary Conditions

Within the framework of the project "ELOBEV" (research of electrolytic coating systems for joining elements made of high-strength materials) funded by the Federal Ministry of Education and Research, a test methodology for the assessment of the danger of hydrogen-assisted and liquid metal-induced cracking for auxiliary joining elements is being developed. One working point of the project is the determination of the hydrogen transport behaviour in high-strength boron-manganese steels and their coating concepts. Permeation measurements under different boundary conditions are used to characterize the hydrogen transport in 22MnB5 and 37MnB4. The results are validated by thermal desorption analyses with a constant heating rate and an isothermal temperature control. Several methods for the determination of the diffusion velocity are investigated and the determined values are compared with each other.

Numerical Investigation of Polymer Coated Nanoporous Gold

Nanoporous metals represent a fascinating class of materials. They consist of a bi-continuous three-dimensional network of randomly intersecting pores and ligaments where the ligaments form the skeleton of the structure. The open-pore structure allows for applying a thin electrolytic coating on the ligaments. In this paper, we will investigate the stiffening effect of a polymer coating numerically. Since the coating adds an additional difficulty for the discretization of the microstructure by finite elements, we apply the finite cell method. This allows for deriving a mesh in a fully automatic fashion from the high resolution 3D voxel model stemming from the 3D focused ion beam-scanning electron microscope tomography data of nanoporous gold. By manipulating the voxel model in a straightforward way, we add a thin polymer layer of homogeneous thickness numerically and study its effect on the macroscopic elastic properties systematically. In order to lower the influence of the boundary conditions on the results, the window method, which is known from homogenization procedures, is applied. In the second part of the paper, we fill the gap between numerical simulations and experimental investigations and determine real material properties of an electrolytic applied polypyrrole coating by inverse computations. The simulations provide an estimate for the mechanical properties of the ligaments and the polymeric coating and are in accordance with experimental data.