Mechanical Machining Monitoring

2020 ◽  
pp. 61-66
Author(s):  
C. Garza
Keyword(s):  
Mechanical Machining

scholarly journals A thermo-mechanical machining method for improving the accuracy and stability of the geometric shape of long low-rigidity shafts

2021 ◽  
Author(s):  
Antoni Świć ◽  
Arkadiusz Gola ◽  
Łukasz Sobaszek ◽  
Natalia Šmidová
Keyword(s):  
Heat Treatment ◽  
Cross Section ◽  
Mechanical Treatment ◽  
Geometric Shape ◽  
Different Dimensions ◽  
Thermo Mechanical Treatment ◽  
Mechanical Machining ◽  
Simultaneous Heat ◽  
Accuracy And Stability

AbstractThe article presents a new thermo-mechanical machining method for the manufacture of long low-rigidity shafts which combines straightening and heat treatment operations. A fixture for thermo-mechanical treatment of long low-rigidity shafts was designed and used in tests which involved axial straightening of shafts combined with a quenching operation (performed to increase the corrosion resistance of the steel used as stock material). The study showed that an analysis of the initial deflections of semi-finished shafts of different dimensions and determination of the maximum corrective deflection in the device could be used as a basis for performing axial straightening of shaft workpieces with simultaneous heat treatment and correction of the initial deflection of the workpiece. The deflection is corrected by stretching the fibers of the stock material, at any cross-section of the shaft, up to the yield point and generating residual stresses symmetrical to the axis of the workpiece. These processes allow to increase the accuracy and stability of the geometric shape of the shaft.

Development of a Simulation Model to Investigate Tool Wear in Ti-6Al-4V Alloy Machining

2011 ◽  
Vol 223 ◽  
pp. 535-544 ◽  
Author(s):  
Volker Schulze ◽  
Frederik Zanger
Keyword(s):  
Tool Wear ◽  
High Strength ◽  
State Variables ◽  
Wear Model ◽  
Fem Model ◽  
Load Variations ◽  
Wear Rates ◽  
Simulation Results ◽  
Mechanical Machining ◽  
Very High

Titanium alloys like Ti‑6Al‑4V have a low density, a very high strength and are highly resistant to corrosion. However, the positive qualities in combination with the low heat conductivity have disadvantageous effects on mechanical machining and on cutting in particular. Ti‑6Al‑4V forms segmented chips for the whole range of cutting velocities which influences tool wear. Thus, optimization of the manufacturing process is difficult. To obtain this goal the chip segmentation process and the tool wear are studied numerically in this article. Therefore, a FEM model was developed which calculates the wear rates depending on state variables from the cutting simulation, using an empirical tool wear model. The segmentation leads to mechanical and thermal load variations, which are taken into consideration during the tool wear simulations. In order to evaluate the simulation results, they are compared with experimentally obtained results for different process parameters.

Material perspective on the evolution of micro- and nano-scale cutting of metal alloys

2018 ◽  
Vol 1 (2) ◽  
pp. 97-114 ◽  
Author(s):  
M. Azizur Rahman ◽  
Mustafizur Rahman ◽  
A. Senthil Kumar
Keyword(s):  
Active Role ◽  
Machining Process ◽  
Metal Alloys ◽  
Sensors And Actuators ◽  
Nano Scale ◽  
Subtractive Manufacturing ◽  
Manufacturing Technologies ◽  
Mechanical Sensors ◽  
Metallic Parts ◽  
Mechanical Machining

Microfabrication plays an active role in miniaturization of products and components in various emerging fields ranging from pharmaceuticals and bio-medical applications to electro-mechanical sensors and actuators to chemical microreactors and mechanical microturbines. Tool-based machining is one of the key technologies of microfabrication. The machining of materials on the micrometre and nanometre scales is fundamental for the fabrication of 3D micro components. However, there are limitations of scaling down the mechanical machining process from the macro- to micro- to nanoscales. Several factors that are not significant in conventional machining become significant in micro/nano-scale machining. This article identifies the important material-related issues on the evolution of micro cutting from conventional cutting process. The main focus is given to the state-of-the art micro/nano-cutting technologies of metal alloys with material perspective. Furthermore, a promising research of coupling the additive and subtractive manufacturing technologies has been highlighted to improve the surface quality of 3D-printed metallic parts.

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