In Situ Measurement of Fluid Film Thickness in Machining

Huang, Chih-Yung; Lee, Seongeyl; Sullivan, John P.; Chandrasekar, Srinivasan

doi:10.1007/s11249-007-9245-6

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…These optical studies rely on a controlled laboratory environment and lubrication-free conditions (e.g. sapphire tool [4,5]). To move towards realistic machining applications in real processes, a different measurement approach is needed.…”

Section: Introductionmentioning

confidence: 99%

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Koegl,

Glahn,

Zigan

2024

Meas. Sci. Technol.

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This study investigates a two-colour LIF (laser-induced fluorescence) technique for thermometry in cooling lubricants (CL) for machining. The diagnostic technique should enable a simultaneous determination of cooling film thickness and film temperature, which is relevant for typical machining processes like turning and milling processes. The temperature determination is based on a temperature-sensitive fluorescence intensity ratio of a special dye determined in suitable spectral regions representing common band pass filters. For this purpose, two cooling lubricant emulsions CL6 (6 vol.% CL, 94 vol.% water; normal machining) and CL10 (10 vol.% CL, 90 vol.% water; heavy machining) and its individual components were doped with the fluorescence dye Eosin-Y. Temperature dependent spectral LIF intensities were recorded in the range of 273–313 K, which are relevant for milling and cutting operations. Furthermore, absorption spectra were analysed as well. The temperature-dependent fluorescence measurements revealed a temperature limit for the emulsion stability. The emission peaks of Eosin-Y are shifted with increasing temperature towards longer wavelengths. The sensitivities of CL10 (1.88%/K) and CL6 (1.58%/K) are comparable to or even higher than the sensitivities of other LIF dyes provided in the literature. The literature-based dyes were however not determined in those cooling lubricants. The measurements showed, that the investigated tracer-cooling lubricant/water emulsions mixed with the dye enable a reliable temperature determination.

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Section: Introductionmentioning

confidence: 99%

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Koegl,

Glahn,

Zigan

2024

Meas. Sci. Technol.

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“…Such materials do not have good oleophobic properties. Huang et al 14 found that during processing, the thickness of the film near a cutting edge was about 15 mm, and the thickness of the film at other positions could reach about 25 mm. When Qin 15 studied the measurement method of lubricating oil film thickness, the measured oil film thickness was about 30 mm.…”

Section: Introductionmentioning

confidence: 99%

Effect of oil adhesion on the measurement of screw thread with machine vision

Yang

Chen

Wang

2020

Measurement and Control

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In the process of screw thread manufacturing, the cooling liquid or lubricating oil will adhere to the screw thread surface, which affects the vision measurement results of the screw thread parameters. To simulate the adhesion behavior of oil on the thread surface during the actual measurement, four different attachment states were set in this experiment. An image measuring instrument was used to collect the screw thread images of different adhesion states. Then, the distribution of the oil film on the screw thread surface was analyzed with computer image processing. The visual inspection method was used to obtain the relative influence rate of the oil adhesion on the measurement result of the screw thread parameters. Finally, an experiment-based pitch diameter compensation method was proposed, and the compensation effect of this method was verified with the test method. Experiments showed that the effect of oil adhesion on the measurement results of the diameter parameters is greater than 7 µm, and the effect on the measurement result of the thread angle is greater than 0.1°. The compensation experiment showed that the compensation efficiency was above 70% for the pitch diameter.

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“…The cutting velocity varies continuously in this modulation configuration. In particular, the direction of instantaneous velocity is reversed and the tool-chip contact is completely disrupted (separation of tool from chip) during each cycle of modulation when the superimposed modulation velocity exceeds the mean (steady) cutting velocity, that is when ωA>V, where x is the angular modulation frequency and 2A is the peak-to-peak amplitude [8]. In practice, ωA would need to be increased beyond V to account for the compliance of the system.…”

Section: Introductionmentioning

confidence: 99%