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American Society for Testing and Materials

Recent advances in modelling of metal machining processes

Cryogenically assisted manufacturing processes are emerging as environmentally-benign, toxic-free, hazardless operations, producing functionally superior products. This paper presents an overview of major cryogenic manufacturing processes, summarizing the state-of-the-art and significant developments during the last few decades. It begins with a summary of historic perspectives, including definitions, scope, and proceeds to analysis of process mechanics and material performance covering tribological and thermo-mechanical interactions, followed by surface integrity, product quality and performance in cryogenic manufacturing. Process analysis and applications includes machining, forming and grinding. Economic, safety and health issues are then discussed. Finally, progress in developing predictive performance models and future outlook are presented.

Cryogenic manufacturing processes

http://www.zebraskimmers.com/pdf_files/metalworking_fluids-mechanisms%20_and_performance_small.pdf

Metalworking fluids—Mechanisms and performance

Monitoring and processing signal applied in machining processes – A review

The quantification of friction coefficient along the tool–workmaterial interface in machining remains an issue in tribology. This paper aims identifying the evolution of friction coefficient for a large range of sliding velocity during the machining of a AISI4140 steel (290 HB) with a TiN coated carbide tool. The influence of a straight oil is investigated compared to a dry sliding situation (dry machining). It has been shown that, in dry machining, friction coefficient decreases with the sliding velocity until reaching a downer limit around 0.2. On the contrary, the presence of a straight oil decreases significantly friction coefficients to a value around 0.1. Additionally, the friction coefficient becomes independent from the sliding velocity. It also been shown that a straight oil is able to penetrate the pin-workmaterial interface even if a very high contact pressure is present (∼3 GPa). The penetration duration is very fast, whereas its evacuation duration is much higher and strongly dependent on sliding speeds.

/pdf/effects-of-a-straight-oil-on-friction-at-the-tool-mgx3fzv39y.pdf

Effects of a straight oil on friction at the tool-workmaterial interface in machining

https://hal.archives-ouvertes.fr/hal-01133716/document

Precision and surface integrity of threads obtained by form tapping

Machinability of inconel 718 during turning: Cutting force model considering tool wear, influence on surface integrity

https://hal.archives-ouvertes.fr/hal-01178081/document

Experimental and numerical assessment of subsurface plastic deformation induced by OFHC copper machining

This study deals with the thread milling process that is considered a complex machining technique due to its elaborated tool geometry and its tridimensional tool trajectory. It needed advanced research on the threading process which has not been much studied. Previous studies focused on geometrical modeling or mechanistic modeling of the thread milling process. There is a need for a better understanding of parameter effects to accomplish a model that tends to be more realistic and includes local parameters. This investigation does the analysis of thread milling parameters: thread geometry, cutting conditions and tool angles, which can be applied to the tool optimization. The cutting forces and torque were measured and representative values of its variation were calculated and analyzed as response of the experiments. A geometrical analysis and an analysis of variance were employed for determining the influence of the factors and based on the results, it is proposed a physical understanding of the process.

/pdf/analytical-and-experimental-investigations-on-thread-milling-5f5m7zd5rz.pdf

Guillaume Fromentin

Papers

Effects of a straight oil on friction at the tool-workmaterial interface in machining

Precision and surface integrity of threads obtained by form tapping

Machinability of inconel 718 during turning: Cutting force model considering tool wear, influence on surface integrity

Experimental and numerical assessment of subsurface plastic deformation induced by OFHC copper machining

Analytical and experimental investigations on thread milling forces in titanium alloy