The dependency of material properties and process conditions on the cutting temperatures when drilling polymers

Weinert, Klaus; Brinkel, Florian; Kempmann, Christoph; Pantke, Klaus

doi:10.1007/s11740-007-0015-y

Cited by 15 publications

(9 citation statements)

References 1 publication

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“…High-quality crosssectional slices, especially for polymer and glass-based devices, require cumbersome processing due to the lack of monocrystalline properties of the materials. [44,45] In addition, invasive cutting or milling procedures can lead to deformation or destruction of delicate microchannels, possibly leading to misinterpretation of processing artifacts. To circumvent these problems, we designed a microfluidic device to investigate the post-bonding quality of targeted microchannels (Figure 4a).…”

Section: The Bonding Methods Can Crucially Impact the Function Of Mic...mentioning

confidence: 99%

Robust and Seamless Integration of Thiol‐Ene‐Epoxy Thermosets with Thermoplastics and Glass as Hybrid Microfluidic Devices Suitable for Drug Studies

Harris,

Kaveh,

Kemas

et al. 2024

Adv Materials Inter

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Facile, durable and biocompatible integration of hybrid Lab‐on‐a‐Chip devices has remained an important challenge in microengineering. Here, the robust and seamless integration of off‐stoichiometry thiol‐ene‐epoxy (OSTE+) thermosets with a diverse range of thermoplastic and glass materials is demonstrated. While direct bonding offers sturdy proprieties for the majority of the material hybrids (up to 1.5 MPa), further surface priming enhances the bonding strength for those of lower surface energy (up to seven‐fold). Using microfluidic devices with a unique configuration of chambers and microchannels down to 100 µm, the impact of various bonding methods on their fluidic functionality is further shown. To investigate the utility of hybrid devices for pharmacological and toxicological studies, both pristine and primed devices are benchmarked against polydimethylsiloxane (PDMS) with regard to cell biocompatibility and drug absorption. While being on par with PDMS in terms of cell viability, pristine OSTE+ devices show an 11‐fold lower absorption of hydrophobic drug molecules. Although surface priming enhances the bonding strength, it compromises other criteria in device performance and biological applications. Combined, results demonstrate a novel integration approach for facile manufacturing of hybrid microfluidic devices using a material toolbox suitable for cell and pharmaceutical studies.

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Section: The Bonding Methods Can Crucially Impact the Function Of Mic...mentioning

confidence: 99%

Robust and Seamless Integration of Thiol‐Ene‐Epoxy Thermosets with Thermoplastics and Glass as Hybrid Microfluidic Devices Suitable for Drug Studies

Harris,

Kaveh,

Kemas

et al. 2024

Adv Materials Inter

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“…Palanisamy et al (2006) presented an estimation of tool-chip interface temperatures for different machining conditions by using Oxley's energy partition function and Rapier's equation to study the thermal effect on the cutting force. Weinert et al (2007) described the influences of the material properties and the process conditions on the cutting temperatures while drilling polymer materials. They concluded that high tool temperatures lead to melting and thermal damage of the material in the peripheral zone of the drill hole.…”

Section: Literature Surveymentioning

confidence: 99%

Investigation of input variables on temperature rise while end milling Al/SiC metal matrix composite

Sridhar

Rajeswari

2020

WJE

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Purpose The purpose of this paper is to find out the optimal level as well as the influence of end mill cutter geometrical and machining parameters while machining metal matrix composite. End milling is carried out on Al 356/SiC metal matrix composites (MMC) using high-speed steel (HSS) end mill cutter. The optimum level of input parameters such as helix angle, nose radius, rake angle, cutting speed, feed rate and depth of cut are calculated for minimum temperature rise. Design/methodology/approach L27 Taguchi orthogonal design, signal-to-noise (S/N) ratio, are applied for conducting experiments, and to find the optimal level of input parameters for minimum temperature rise, respectively. Analysis of variance (ANOVA) is used to analyze the significance of input parameters on temperature rise. Findings It is found that the optimal combination of helix angle 400, nose radius 0.8 mm, rake angle 80, cutting speed 30 m/min, feed rate 0.04 mm/rev and depth of cut 0.5 mm have generated minimum temperature rise. From ANOVA analysis, it is found that rake angle influence is more on output performance followed by cutting speed and nose radius compared with other machining and geometrical parameters. Originality/value The influence of geometrical parameters such as helix angle, nose radius and rake angle of end mill cutter on temperature rise while machining MMC has not been explored previously.

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“…Two totally different geometries of uncoated cemented carbide twist drill bits (details given in Table 2) having an equal diameter of 8 mm were used in this study. The uncoated carbide tools are much suitable when compared to the TiN‐ or TiAlN‐coated ones, because of the inappropriate tribological behavior in cutting, the lower fracture toughness and the relatively weaker interlayer adhesion of these coatings to the carbide substrate 15. The selected drill bit T1 has a very fine and tough grain‐structure K30F, which is why it is usually recommended for the applications with abrasive workpiece materials like CFRPs.…”

Section: Experimental Techniquesmentioning

confidence: 99%

In Situ Qualitative Inspection of Hole Exit Delamination at Bottom‐Ply during Drilling of Woven CFRP Epoxy Composite Laminates

Faraz

Biermann

2013

Adv Eng Mater

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Exploiting very high speed digital videography, an in situ examination of the hole exit delamination at the bottom‐most ply during drilling holes in the selected woven CFRP epoxy laminates is presented. At the beginning, a rotating elastic bulge of the carbon fibers at the bottom‐ply, which is just the impression of the protruding drill chisel edge, was always observed. Following the elastic bulging, a few, initial cracks along the weak fiber/matrix interfaces appeared. Thereafter, tensile failures in the carbon fibers were seen. The exact location of the initiation of these fiber failures specifically depends on the actual drill‐hole position with respect to the woven configuration of the bottom‐ply. A visual model for the weak interstitial or undulated regions at the bottom‐ply is also proposed in this paper, showing the undulating fibers, which are susceptible to mostly tensile failures under the drilling loads. During a sub‐completion drilling‐phase at the bottom‐ply, various cracks were seen to be propagating mostly via linear paths. Also, the exit delamination at the bottom‐ply during a sub‐completion drilling‐phase was always observed as to be divided into various small, independent localized contours—each of which propagated almost independently through within several individual warps/wefts during drill‐feed. Also, the shape of each such tiny contour within a single warp/weft was identified as elliptic, which is observed around an entire drill‐hole in unidirectional (UD) composites as reported in literature. It was also observed that the overhanging cantilever‐like fibers at the bottom‐ply are really difficult to cut, once their base‐location or their exit delamination contour reaches outside the hole nominal diameter. Moreover, by referring to some very basic cutting angle configurations for the orthogonal trimming of UD‐composites as found rarely in archival literature, an illustrative model diagram is also proposed for the drilling of the selected laminate material. This idea is also approximately validated via a few visual observations. The proposed visual model is generally an attempt in correlating the observed peripheral hole quality (delamination) with various instantaneous tool/fiber engagement configurations occurring across the entire drill‐hole periphery at the bottom‐ply, during the very last drilling‐phase.

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The dependency of material properties and process conditions on the cutting temperatures when drilling polymers

Cited by 15 publications

References 1 publication

Robust and Seamless Integration of Thiol‐Ene‐Epoxy Thermosets with Thermoplastics and Glass as Hybrid Microfluidic Devices Suitable for Drug Studies

Robust and Seamless Integration of Thiol‐Ene‐Epoxy Thermosets with Thermoplastics and Glass as Hybrid Microfluidic Devices Suitable for Drug Studies

Investigation of input variables on temperature rise while end milling Al/SiC metal matrix composite

In Situ Qualitative Inspection of Hole Exit Delamination at Bottom‐Ply during Drilling of Woven CFRP Epoxy Composite Laminates

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