Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

Haitao Qu

AVIC Manufacturing Technology Institute (CN)

Ostatnie publikacje
1.  Liu L., Qu H., Duan R., Liu T., Li C., Wang E., Liu L., Theoretical Research on Flow and Heat Transfer Characteristics of Hydrostatic Oil Film in Flat Microfluidic Boundary Layer, Energies, ISSN: 1996-1073, DOI: 10.3390/en15072443, Vol.15, No.7, pp.2443-1-13, 2022

Streszczenie:
The hydrostatic bearing is the core component of ultra-precision computer numerical control (CNC) machine tools. Because the temperature rise in the oil film of hydrostatic bearings seriously affects the working accuracy of the bearings, it is important to study the flow and heat transfer characteristics of the oil film. Based on the physical model of an incompressible viscous fluid flowing in a flat microfluidic boundary layer, velocity, temperature and heat flux distribution equations of oil film are constructed by theories of heat transfer and hydrodynamics. Then, the effects of several parameters on velocity distribution, temperature distribution and heat flux distribution are analyzed, such as the upper plate velocity, the channel length, and so on. The results show that the dimensionless velocity of the oil film decreases with the increase in the upper plate velocity and the channel length. The oil film temperature distribution can be divided into three zones: the increasing zone, stabilizing zone and decreasing zone. The heat flux decreases linearly with the increase in the plate thickness, and increases linearly with the increase in the temperature difference.

Słowa kluczowe:
microfluidic boundary layer,hydrostatic oil film,velocity,temperature,heat flux

Afiliacje autorów:
Liu L. - Donghua University (CN)
Qu H. - AVIC Manufacturing Technology Institute (CN)
Duan R. - inna afiliacja
Liu T. - inna afiliacja
Li C. - inna afiliacja
Wang E. - inna afiliacja
Liu L. - IPPT PAN
140p.
2.  Liu X., Kopeć M., Fakir O., Qu H., Wang Y., Wang L., Li Z., Characterisation of the interfacial heat transfer coefficient in hot stamping of titanium alloys, International Communications in Heat and Mass Transfer, ISSN: 0735-1933, DOI: 10.1016/j.icheatmasstransfer.2020.104535, Vol.113, pp.104535-1-14, 2020

Streszczenie:
The interfacial heat transfer coefficient (IHTC) for titanium alloys is an important parameter in non-isothermal hot stamping processes to determine the temperature field as well as temperature-dependent material behaviours that consequently affect the post-form properties of the formed components. However, the IHTC for titanium alloys in hot stamping processes has seldom been studied before. In the present research, the effects of contact pressure, lubricant, surface roughness, tooling material and initial blank temperature on the IHTC for the titanium alloy Ti-6Al-4V were studied and modelled to characterise the IHTC values under various hot stamping conditions as well as identify the functional mechanisms affecting the IHTC. Furthermore, the results of hot stamping of Ti-6Al4V wing stiffener components were used to verify the simulation results of the temperature field of the formed component with an error of less than 5%.

Słowa kluczowe:
interfacial heat transfer coefficient (IHTC), Ti-6Al-4V, hot stamping, experimental validation

Afiliacje autorów:
Liu X. - Imperial College London (GB)
Kopeć M. - IPPT PAN
Fakir O. - inna afiliacja
Qu H. - AVIC Manufacturing Technology Institute (CN)
Wang Y. - Beijing Aeronautical Manufacturing Technology Research Institute (CN)
Wang L. - Imperial College London (GB)
Li Z. - AVIC Manufacturing Technology Institute (CN)
140p.
3.  Li Z., Qu H., Chen F., Wang Y., Tan Z., Kopeć M., Wang K., Zheng K., Deformation behavior and microstructural evolution during hot stamping of TA15 sheets: experimentation and modelling, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12020223, Vol.12, No.2, pp.223-1-14, 2019

Streszczenie:
Near-α titanium alloys have extensive applications in high temperature structural components of aircrafts. To manufacture complex-shaped titanium alloy panel parts with desired microstructure and good properties, an innovative low-cost hot stamping process for titanium alloy was studied in this paper. Firstly, a series of hot tensile tests and Scanning Electron Microscope (SEM) observations were performed to investigate hot deformation characteristics and identify typical microstructural evolutions. The optimal forming temperature range is determined to be from 750 °C to 900 °C for hot stamping of TA15. In addition, a unified mechanisms-based material model for TA15 titanium alloy based on the softening mechanisms of recrystallization and damage was established, which enables to precisely predict stress-strain behaviors and potentially to be implemented into Finite Element (FE) simulations for designing the reasonable processing window of structural parts for the aerospace industry.

Słowa kluczowe:
TA15, hot stamping, phase evolution, deformation, modelling

Afiliacje autorów:
Li Z. - AVIC Manufacturing Technology Institute (CN)
Qu H. - AVIC Manufacturing Technology Institute (CN)
Chen F. - AVIC Manufacturing Technology Institute (CN)
Wang Y. - Beijing Aeronautical Manufacturing Technology Research Institute (CN)
Tan Z. - Imperial College London (GB)
Kopeć M. - IPPT PAN
Wang K. - Imperial College London (GB)
Zheng K. - Imperial College London (GB)
140p.

Abstrakty konferencyjne
1.  Wang K., Kopeć M., Qu H., Wang Y., Wang L., Lin J., Li Z., A unified constitutive model for two-phase titanium alloys under hot stamping condition, ICNFT 2018, 5th International Conference on New Forming Technology, 2018-08-18/08-21, Bremen (DE), pp.1, 2018

Kategoria A Plus

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