The Experts below are selected from a list of 7269 Experts worldwide ranked by ideXlab platform

Deyuan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on drilling load and hole quality during rotary ultrasonic helical machining of small diameter cfrp holes
    Journal of Materials Processing Technology, 2019
    Co-Authors: Daxi Geng, Yunda Teng, Zhenyu Shao, Xinggang Jiang, Deyuan Zhang
    Abstract:

    Abstract Small-diameter CFRP holes have a number of applications such as aerospace structures, circuit boards and rehabilitation medical equipments. High quality hole-making technology for the small-diameter CFRP holes is urgently needed due to various mechanical damages in twist drilling and Chip Removal clog in core drilling. In order to improve the hole quality, rotary ultrasonic helical machining (RUHM) was developed for machining small-diameter CFRP holes in this paper. The trajectory of cutting edge in RUHM was modelled and the intermittent cutting mode in RUHM was analyzed. Afterwards, the comparison experiments were conducted between RUHM and conventional grinding (CG). The results shows that compared to CG, both thrust force and transverse force were remarkably reduced in RUHM with a maximum decrement of 71.3% and 61.5%, respectively. Meanwhile, both the hole edge quality and surface integrity were significantly improved in RUHM. Compared to CG, delamination factor at hole exit was reduced by 12.8–25.7% and surface roughness for hole inner surface was reduced by 51.9%–53.2% for Ra value in RUHM. Moreover, the mechanisms of cutting force reduction, delamination formation and suppression, and surface roughness improvement in RUHM were also analyzed. The results suggest that RUHM is a promising processing strategy for machining small-diameter CFRP holes.

  • Rotary ultrasonic elliptical machining for side milling of CFRP: Tool performance and surface integrity
    Ultrasonics, 2015
    Co-Authors: Daxi Geng, Fengtao He, Dapeng Liu, Yonggang Xu, Deyuan Zhang, Zuoheng Duan
    Abstract:

    The rotary ultrasonic elliptical machining (RUEM) has been recognized as a new effective process to machining circular holes on CFRP materials. In CFRP face machining, the application of grinding tools is restricted for the tool clogging and the machined surface integrity. In this paper, we proposed a novel approach to extend the RUEM process to side milling of CFRP for the first time, which kept the effect of elliptical vibration in RUEM. The experiment apparatus was developed, and the preliminary experiments were designed and conducted, with comparison to conventional grinding (CG). The experimental results showed that when the elliptical vibration was applied in RUEM, a superior cutting process can be obtained compared with that in CG, including providing reduced cutting forces (2-43% decrement), an extended tool life (1.98 times), and improved surface integrity due to the intermittent material Removal mechanism and the excellent Chip Removal conditions achieved in RUEM. It was concluded that the RUEM process is suitable to mill flat surface on CFRP composites.

  • feasibility study of the rotary ultrasonic elliptical machining of carbon fiber reinforced plastics cfrp
    International Journal of Machine Tools & Manufacture, 2012
    Co-Authors: Jing Liu, Deyuan Zhang, Longgang Qin, Linsong Yan
    Abstract:

    Abstract Carbon fiber reinforced plastics (CFRP) are used for various aircraft structural components because of their superior mechanical and physical properties such as high specific strength, high specific stiffness, etc. However, when CFRP are machined, rapid tool wear and delamination are troublesome. Therefore, cost effective and excellent quality machining of CFRP remains a challenge. In this paper, the rotary ultrasonic elliptical machining (RUEM) using core drill is proposed for drilling of holes on CFRP panels. This method combines advantages of core-drill and elliptical tool vibration towards achieving better quality, delamination free holes. The cutting force model and Chip-Removal phenomenon in ultrasonic elliptical vibration cutting are introduced and analyzed. The feasibility to machine CFRP for RUEM is verified experimentally. The results demonstrate that compared to conventional drilling (CD), the Chip-Removal rate has been improved, tool wear is reduced, precision and surface quality around holes is enhanced, delamination at hole exits has been prevented and significant reduction in cutting force has been achieved.

Daxi Geng - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on drilling load and hole quality during rotary ultrasonic helical machining of small diameter cfrp holes
    Journal of Materials Processing Technology, 2019
    Co-Authors: Daxi Geng, Yunda Teng, Zhenyu Shao, Xinggang Jiang, Deyuan Zhang
    Abstract:

    Abstract Small-diameter CFRP holes have a number of applications such as aerospace structures, circuit boards and rehabilitation medical equipments. High quality hole-making technology for the small-diameter CFRP holes is urgently needed due to various mechanical damages in twist drilling and Chip Removal clog in core drilling. In order to improve the hole quality, rotary ultrasonic helical machining (RUHM) was developed for machining small-diameter CFRP holes in this paper. The trajectory of cutting edge in RUHM was modelled and the intermittent cutting mode in RUHM was analyzed. Afterwards, the comparison experiments were conducted between RUHM and conventional grinding (CG). The results shows that compared to CG, both thrust force and transverse force were remarkably reduced in RUHM with a maximum decrement of 71.3% and 61.5%, respectively. Meanwhile, both the hole edge quality and surface integrity were significantly improved in RUHM. Compared to CG, delamination factor at hole exit was reduced by 12.8–25.7% and surface roughness for hole inner surface was reduced by 51.9%–53.2% for Ra value in RUHM. Moreover, the mechanisms of cutting force reduction, delamination formation and suppression, and surface roughness improvement in RUHM were also analyzed. The results suggest that RUHM is a promising processing strategy for machining small-diameter CFRP holes.

  • Rotary ultrasonic elliptical machining for side milling of CFRP: Tool performance and surface integrity
    Ultrasonics, 2015
    Co-Authors: Daxi Geng, Fengtao He, Dapeng Liu, Yonggang Xu, Deyuan Zhang, Zuoheng Duan
    Abstract:

    The rotary ultrasonic elliptical machining (RUEM) has been recognized as a new effective process to machining circular holes on CFRP materials. In CFRP face machining, the application of grinding tools is restricted for the tool clogging and the machined surface integrity. In this paper, we proposed a novel approach to extend the RUEM process to side milling of CFRP for the first time, which kept the effect of elliptical vibration in RUEM. The experiment apparatus was developed, and the preliminary experiments were designed and conducted, with comparison to conventional grinding (CG). The experimental results showed that when the elliptical vibration was applied in RUEM, a superior cutting process can be obtained compared with that in CG, including providing reduced cutting forces (2-43% decrement), an extended tool life (1.98 times), and improved surface integrity due to the intermittent material Removal mechanism and the excellent Chip Removal conditions achieved in RUEM. It was concluded that the RUEM process is suitable to mill flat surface on CFRP composites.

Linsong Yan - One of the best experts on this subject based on the ideXlab platform.

  • feasibility study of the rotary ultrasonic elliptical machining of carbon fiber reinforced plastics cfrp
    International Journal of Machine Tools & Manufacture, 2012
    Co-Authors: Jing Liu, Deyuan Zhang, Longgang Qin, Linsong Yan
    Abstract:

    Abstract Carbon fiber reinforced plastics (CFRP) are used for various aircraft structural components because of their superior mechanical and physical properties such as high specific strength, high specific stiffness, etc. However, when CFRP are machined, rapid tool wear and delamination are troublesome. Therefore, cost effective and excellent quality machining of CFRP remains a challenge. In this paper, the rotary ultrasonic elliptical machining (RUEM) using core drill is proposed for drilling of holes on CFRP panels. This method combines advantages of core-drill and elliptical tool vibration towards achieving better quality, delamination free holes. The cutting force model and Chip-Removal phenomenon in ultrasonic elliptical vibration cutting are introduced and analyzed. The feasibility to machine CFRP for RUEM is verified experimentally. The results demonstrate that compared to conventional drilling (CD), the Chip-Removal rate has been improved, tool wear is reduced, precision and surface quality around holes is enhanced, delamination at hole exits has been prevented and significant reduction in cutting force has been achieved.

Mücklich, Frank T. - One of the best experts on this subject based on the ideXlab platform.

  • Microstructural and metallurgical assessment of the laser-patterned cemented tungsten carbide (WC-CoNi)
    2018
    Co-Authors: Fang Shiqi, Llanes Pitarch, Luis Miguel, Soldera Flavio, Rosenkranz A., Herrmann T., Bähre Dirk, Mücklich, Frank T.
    Abstract:

    Cemented carbide is difficult to machine using traditional Chip-Removal methods due to its hardness. Electrical discharge machining (EDM) is the common method applied to shape cemented carbides because high geometric precision can be achieved. However, some important defects (pores, residual stresses or oxidation products) can be induced due to thermal reactions. Ultra-short pulse laser processing can also provide high precision and meanwhile effectively avoid these defects due to its short laser-matter reaction time. In this paper, three different patterns on WC-CoNi cemented carbides for tribological purposes, namely line-like patterns, dimples and grooves, have been created using different laser set-ups with pulse duration in the range of nanoseconds (10-9s), picoseconds (10-12s) and femtoseconds (10-15s). Microstructural and metallurgical changes of modified surfaces have been studied. Laser scanning microscopy (LSM) is conducted to measure the pattern dimensions. Focused ion beam (FIB) in combination with scanning electron microscope (SEM) is used to investigate the microstructural changes of the patterned materials. © 2018 Elsevier B.V. All rights reserved

  • Microstructural and metallurgical assessment of the laser-patterned cemented tungsten carbide (WC-CoNi)
    'Elsevier BV', 2018
    Co-Authors: Fang Shiqi, Llanes Pitarch, Luis Miguel, Soldera Flavio, Rosenkranz A., Herrmann T., Bähre Dirk, Mücklich, Frank T.
    Abstract:

    Cemented carbide is difficult to machine using traditional Chip-Removal methods due to its hardness. Electrical discharge machining (EDM) is the common method applied to shape cemented carbides because high geometric precision can be achieved. However, some important defects (pores, residual stresses or oxidation products) can be induced due to thermal reactions. Ultra-short pulse laser processing can also provide high precision and meanwhile effectively avoid these defects due to its short laser-matter reaction time. In this paper, three different patterns on WC-CoNi cemented carbides for tribological purposes, namely line-like patterns, dimples and grooves, have been created using different laser set-ups with pulse duration in the range of nanoseconds (10-9s), picoseconds (10-12s) and femtoseconds (10-15s). Microstructural and metallurgical changes of modified surfaces have been studied. Laser scanning microscopy (LSM) is conducted to measure the pattern dimensions. Focused ion beam (FIB) in combination with scanning electron microscope (SEM) is used to investigate the microstructural changes of the patterned materials. © 2018 Elsevier B.V. All rights reserved.Postprint (published version

Fang Shiqi - One of the best experts on this subject based on the ideXlab platform.

  • Surface integrity assessment of laser treated and subsequently coated cemented carbides
    'Elsevier BV', 2019
    Co-Authors: Fang Shiqi, García Marro Fernando, Salán Ballesteros, Maria Núria, Cruz Marlo, Colominas Guardia Carles, Aehre Dirk, Llanes Pitarch, Luis Miguel
    Abstract:

    Cemented carbides, referred to as hardmetals, are forefront engineering materials widely implemented in industry for Chip-Removal cutting tools and supporting parts. As a newly developed technology for surface modification with high precision, the application of short pulse laser may extend the utilization of cemented carbides. However, surface integrity of laser-treated materials may be affected during the ablation phenomena. These potential changes may also be relevant for subsequent coating deposition, a surface modification stage usually invoked in many cutting and forming tools. It is the objective of this work to study the influence of a previous laser treatment on the surface integrity of a cemented carbide grade, finally coated by a ceramic layer introduced by physical vapor deposition. In doing so, a nanosecond laser has been employed. Surface integrity is assessed in terms of roughness, hardness, and microstructural changes induced at the subsurface level. It is found that pulse laser can effectively remove the target material, resulting roughness being similar to that attained by abrasive grinding. Although some subsurface damage is observed, it is limited to a very shallow layer, this being thoroughly eliminated during sandblasting implemented before coating deposition. Relative hardness increase is larger for laser treated substrate than for just polished one, reason behind it being speculated to come from the sandblasting stage used for removing damaged layer.Peer ReviewedPostprint (author's final draft

  • Microstructural and metallurgical assessment of the laser-patterned cemented tungsten carbide (WC-CoNi)
    2018
    Co-Authors: Fang Shiqi, Llanes Pitarch, Luis Miguel, Soldera Flavio, Rosenkranz A., Herrmann T., Bähre Dirk, Mücklich, Frank T.
    Abstract:

    Cemented carbide is difficult to machine using traditional Chip-Removal methods due to its hardness. Electrical discharge machining (EDM) is the common method applied to shape cemented carbides because high geometric precision can be achieved. However, some important defects (pores, residual stresses or oxidation products) can be induced due to thermal reactions. Ultra-short pulse laser processing can also provide high precision and meanwhile effectively avoid these defects due to its short laser-matter reaction time. In this paper, three different patterns on WC-CoNi cemented carbides for tribological purposes, namely line-like patterns, dimples and grooves, have been created using different laser set-ups with pulse duration in the range of nanoseconds (10-9s), picoseconds (10-12s) and femtoseconds (10-15s). Microstructural and metallurgical changes of modified surfaces have been studied. Laser scanning microscopy (LSM) is conducted to measure the pattern dimensions. Focused ion beam (FIB) in combination with scanning electron microscope (SEM) is used to investigate the microstructural changes of the patterned materials. © 2018 Elsevier B.V. All rights reserved

  • Microstructural and metallurgical assessment of the laser-patterned cemented tungsten carbide (WC-CoNi)
    'Elsevier BV', 2018
    Co-Authors: Fang Shiqi, Llanes Pitarch, Luis Miguel, Soldera Flavio, Rosenkranz A., Herrmann T., Bähre Dirk, Mücklich, Frank T.
    Abstract:

    Cemented carbide is difficult to machine using traditional Chip-Removal methods due to its hardness. Electrical discharge machining (EDM) is the common method applied to shape cemented carbides because high geometric precision can be achieved. However, some important defects (pores, residual stresses or oxidation products) can be induced due to thermal reactions. Ultra-short pulse laser processing can also provide high precision and meanwhile effectively avoid these defects due to its short laser-matter reaction time. In this paper, three different patterns on WC-CoNi cemented carbides for tribological purposes, namely line-like patterns, dimples and grooves, have been created using different laser set-ups with pulse duration in the range of nanoseconds (10-9s), picoseconds (10-12s) and femtoseconds (10-15s). Microstructural and metallurgical changes of modified surfaces have been studied. Laser scanning microscopy (LSM) is conducted to measure the pattern dimensions. Focused ion beam (FIB) in combination with scanning electron microscope (SEM) is used to investigate the microstructural changes of the patterned materials. © 2018 Elsevier B.V. All rights reserved.Postprint (published version