Physics in metal cutting

Childs, T.H.C.; Rowe, G. W.

doi:10.1088/0034-4885/36/3/001

Cited by 52 publications

(14 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chip curl results in this case appear to suggest that there is significant rubbing between the chip and the rake face of the tool. Furthermore, a tighter chip curl is also attributed to reduced coefficient of friction between the chip and the tool [25]. As the GPL concentration is increased, the coefficient of friction has been observed to reduce in GPL composites [26].…”

Section: Chip Curlmentioning

confidence: 96%

“…The extent of curl in a chip is particularly dependent on the relative amount of deformation that occurs in the primary and the secondary shear zones [24,25]. The shear deformation in the primary zone has a tendency to curl the chip outward; whereas, the plastic deformation and the compressive stress produced by the tool in the secondary shear zone makes the chip curl inward [24,25]. The chip curl results in this case appear to suggest that there is significant rubbing between the chip and the rake face of the tool.…”

Section: Chip Curlmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of the Machinability of Epoxy Reinforced With Graphene Platelets

Arora¹,

Samuel²,

Koratkar

2013

Journal of Manufacturing Science and Engineering

View full text Add to dashboard Cite

The objective of this research is to study the effect of graphene platelet (GPL) loading on the machinability of epoxy-based GPL composites. To this end, micro-milling experiments are conducted on composites with varying GPL content and their results are contrasted against that of plain epoxy. The material microstructure is characterized using transmission electron microscopy and scanning electron microscopy methods. Chip morphology, cutting force, machined surface morphology, and tool wear, are employed as the machinability measures for comparative purposes. At lower loadings of GPL (0.1% and 0.2% by weight), the deformation of the polymer phase plays a major role; whereas, at a higher loading of 0.3% by weight, the GPL agglomerates and interface-dominated failure dictates the machining response. The minimum chip thickness value of the composites decreases with an increase in GPL loading. Overall, the 0.2% GPL composite has the highest cutting force and the lowest tool wear.

show abstract

Section: Chip Curlmentioning

confidence: 96%

Section: Chip Curlmentioning

confidence: 99%

Experimental Investigation of the Machinability of Epoxy Reinforced With Graphene Platelets

Arora¹,

Samuel²,

Koratkar

2013

Journal of Manufacturing Science and Engineering

View full text Add to dashboard Cite

show abstract

“…The model also provides a prediction of the shear plane angle φ based on an energy-minimization argument similar to the one proposed by Ernst and Merchant [31], but since the model does not include friction this prediction is not expected to be accurate. Furthermore, there is doubt about the theoretical and experimental validity of this argument [40][41][42].…”

Section: Plastic Regionmentioning

confidence: 99%

Microwedge Machining for the Manufacture of Directional Dry Adhesives

Day

Eason

Esparza³

et al. 2013

Journal of Micro and Nano-Manufacturing

View full text Add to dashboard Cite

Directional dry adhesives are inspired by animals such as geckos and are a particularly useful technology for climbing applications. Previously, they have generally been manufactured using photolithographic processes. This paper presents a micromachining process that involves making cuts in a soft material using a sharp, lubricated tool to create closely spaced negative cavities of a desired shape. The machined material becomes a mold into which an elastomer is cast to create the directional adhesive. The trajectory of the tool can be varied to avoid plastic flow of the mold material that may adversely affect adjacent cavities. The relationship between tool trajectory and resulting cavity shape is established through modeling and process characterization experiments. This micromachining process is much less expensive than previous photolithographic processes used to create similar features and allows greater flexibility with respect to the microscale feature geometry, mold size, and mold material. The micromachining process produces controllable, directional adhesives, where the normal adhesion increases with shear loading in a preferred direction. This is verified by multi-axis force testing on a flat glass substrate. Upon application of a post-treatment to decrease the roughness of the engaging surfaces of the features after casting, the adhesives significantly outperform comparable directional adhesives made from a photolithographic mold.

show abstract

“…The maximum strain rates involved in forging processes are of the order of 10 3 s À1 [30] and are relatively low compared with those in the machining process. The deformation rates involved during the machining processes, on the other hand, are very high, typically of the order of 10 6 s À1 [31]. Similarly the difference in temperatures involved in these processes is very high.…”

Section: Comparison Between the Machining And Forging Processes: Opermentioning

confidence: 99%

An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

Iqbal

Mativenga²,

Sheikh³

2008

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

This paper is concerned with the development of an experimental set-up and finite element (FE) modelling of dry sliding of metals to estimate the interface heat transfer coefficient. Heat transfer between the chip, the tool, and the environment during the metalmachining process has an impact on the temperatures and on the wear mechanisms, and hence on the tool life and on the accuracy of the machined component. For modelling of the metal-machining process, the interface heat transfer coefficient is an important input parameter to quantify the transfer of heat between the chip and the tool and to predict the temperature distribution accurately within the cutting tool. In previous studies involving FE analysis of the metal-machining process, the heat transfer coefficient has been assumed to be between 10 kW/m 2 C and 100 000 kW/m 2 C, with a background from metal-forming processes (especially forging). Based on the operating characteristics, metal-forming and metal-machining processes are different in nature. Hence there was a need to develop a procedure close to the metal-machining process, to estimate this parameter in order to increase the reliability of FE models. To this end, an experimental set-up was developed in which an uncoated cemented carbide pin was rubbed against a steel workpiece while the later was rotated at speeds similar to the cutting tests. This modified pin-on-disc set-up was equipped with temperature and force-monitoring equipment. An FE model was constructed for heat generation and frictional contact. The experimental and modelling results of the dry sliding process yield the interface heat transfer coefficient for a range of rubbing speeds.

show abstract

Physics in metal cutting

Cited by 52 publications

References 53 publications

Experimental Investigation of the Machinability of Epoxy Reinforced With Graphene Platelets

Experimental Investigation of the Machinability of Epoxy Reinforced With Graphene Platelets

Microwedge Machining for the Manufacture of Directional Dry Adhesives

An investigative study of the interface heat transfer coefficient for finite element modelling of high-speed machining

Contact Info

Product

Resources

About