Grinding Model and Material Removal Mechanism of Medical Nanometer Zirconia Ceramics

Zhang, Dongkun; Li, Changhe; Jia, Dongzhou; Wang, Sheng; Li, Runze; Qi, Xiaoxiao

doi:10.2174/1872210507666131117183502

Cited by 23 publications

(9 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In many grinding systems, the grinding performance is mainly limited by the dynamic stiffness of the system, and larger grinding force brings larger vibration between grinding wheel and workpiece. 33 As the feeding velocity keeps constant and the vibration increases with the rise of depth of cut, the whole envelope curve of UCT will move upward and cross the original equal SSD line (see Figure 19). Chen et al 4 also analyzed the influence of vibration on SR (surface roughness) and SSD.…”

Section: Online Force Control Experimentsmentioning

confidence: 99%

Online force control of large optical grinding machine for brittle materials assisted by force prediction

Lin

Wang

Jiang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

Trajectory planning of aspherical surfaces with appropriate cutting parameters is always a tedious task, especially on difficult-to-grind materials. Orthogonal experiments are usually designed and conducted first to get a full estimation of forces under different sets of grinding conditions (e.g. depth of cut and feeding velocity). However, all these data will change, as the grinding wheel becomes blunt. To reduce the work on the selection of grinding parameters and keep the grinding process stable, a new force-controlled grinding strategy for large optical grinding machine on brittle material is proposed. The grinding force is controlled by adjusting feeding velocity along the trajectories in real time. The grinding force model is established by analyzing the complex contact area between the arc-shaped wheel and the workpiece. The co-existing of brittle and ductile removal is also considered. For the longtime delay of the system, the controller foresees the grinding force in 0.4 s later based on the model proposed, to prevent the large overshoot of the force (up to 87.5%). The verification of the controller was conducted on silicon carbide ceramics. The force overshoot was reduced to 22.5%, and the motion accuracy was guaranteed by position servo within 5 µm. The subsurface damage along the trajectory was further analyzed and discussed.

show abstract

Section: Online Force Control Experimentsmentioning

confidence: 99%

Online force control of large optical grinding machine for brittle materials assisted by force prediction

Lin

Wang

Jiang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…To address above issues, electrolytic inprocess dressing (ELID) grinding was proposed. Figures 5 and 6 show the diameter and basic working principles and mechanisms of ELID grinding [119]. This technology offers an innovative approach to dress the metal-based grinding wheel by applying an electrolysis method.…”

Section: Precision Grindingmentioning

confidence: 99%

State of the art of bioimplants manufacturing: part I

Kang

Fang

2018

Adv. Manuf.

View full text Add to dashboard Cite

Bioimplants are becoming increasingly important in the modern society due to the fact of an aging population and associated issues of osteoporosis and osteoarthritis. The manufacturing of bioimplants involves an understanding of both mechanical engineering and biomedical science to produce biocompatible products with adequate lifespans. A suitable selection of materials is the prerequisite for a long-term and reliable service of the bioimplants, which relies highly on the comprehensive understanding of the material properties. In this paper, most biomaterials used for bioimplants are reviewed. The typical manufacturing processes are discussed in order to provide a perspective on the development of manufacturing fundamentals and latest technologies. The review also contains a discussion on the current measurement and evaluation constraints of the finished bioimplant products. Potential future research areas are presented at the end of this paper.

show abstract

“…Herein, the kinetic energy formed from the abrasive mass and velocity would impact the zirconia surfaces creating micro-removal finishing [ 9 ]. When a brittle material is impacted by a hard particle, plastic deformation occurs in front of a crack tip creating compressive and shear stresses and as a result, the radial cracks are generated directly under the impact zone [ 16 ]. After yield point, tensile residual stresses left in an material on unloading would cause lateral cracks provoking the material removal [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…When a brittle material is impacted by a hard particle, plastic deformation occurs in front of a crack tip creating compressive and shear stresses and as a result, the radial cracks are generated directly under the impact zone [ 16 ]. After yield point, tensile residual stresses left in an material on unloading would cause lateral cracks provoking the material removal [ 16 ]. Furthermore, the properties of the sandblasting particles, such as hardness, size, shape can affect their kinetic energy as a result of the particle-target interactions [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Phase Transformations and Subsurface Changes in Three Dental Zirconia Grades after Sandblasting with Various Al2O3 Particle Sizes

et al. 2021

View full text Add to dashboard Cite

Although sandblasting is mainly used to improve bonding between dental zirconia and resin cement, the details on the in-depth damages are limited. The aim of this study was to evaluate phase transformations and subsurface changes after sandblasting in three different dental zirconia (3, 4, and 5 mol% yttria-stabilized zirconia; 3Y-TZP, 4Y-PSZ, and 5Y-PSZ). Zirconia specimens (14.0 × 14.0 × 1.0 mm3) were sandblasted using different alumina particle sizes (25, 50, 90, 110, and 125 µm) under 0.2 MPa for 10 s/cm2. Phase transformations and residual stresses were investigated using X-ray diffraction and the Williamson-Hall method. Subsurface damages were evaluated with cross-sections by a focused ion beam. Stress field during sandblasting was simulated by the finite element method. The subsurface changes after sandblasting were the emergence of a rhombohedral phase, micro/macro cracks, and compressive/tensile stresses depending on the interactions between blasting particles and zirconia substrates. 3Y-TZP blasted with 110-µm particles induced the deepest transformed layer with the largest compressive stress. The cracks propagated parallel to the surface with larger particles, being located up to 4.5 µm under the surface in 4Y- or 5Y-PSZ subgroups. The recommended sandblasting particles were 110 µm for 3Y-TZP and 50 µm for 4Y-PSZ or 5Y-PSZ for compressive stress-induced phase transformations without significant subsurface damages.

show abstract

Grinding Model and Material Removal Mechanism of Medical Nanometer Zirconia Ceramics

Cited by 23 publications

References 79 publications

Online force control of large optical grinding machine for brittle materials assisted by force prediction

Online force control of large optical grinding machine for brittle materials assisted by force prediction

State of the art of bioimplants manufacturing: part I

Phase Transformations and Subsurface Changes in Three Dental Zirconia Grades after Sandblasting with Various Al2O3 Particle Sizes

Contact Info

Product

Resources

About