An investigation of effective area in electrorheological fluid-assisted polishing of tungsten carbide

Zhang, Lei; Zhao, Yun; He, Xin; Kuriyagawa, Tsunemoto

doi:10.1016/j.ijmachtools.2007.10.011

Cited by 30 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Zhang et al used a microgap of 50 μm to investigate the effective polishing region in which the abrasive particles of diamond were used as the conductive material. [ 21 ] Su et al measured the removal depth with different applied voltage using a Zyko interferometer, revealing that the interaction forces between abrasive particles play a key role in the capability of material removal. [ 22 ] On the other hand, if the gap is fixed, the surface roughness proportionally increases with the speed and voltage; however, the volume percentage and the properties of abrasive particles have a complicated influence on lower concentration.…”

Section: Figurementioning

confidence: 99%

Ultra‐Precision Processing of Conductive Materials via Electrorheological Fluid‐Assisted Polishing

et al. 2020

View full text Add to dashboard Cite

The rapid development of image technology and optical network technology requires novel electronic and optical devices of small size and complex surfaces but well-controlled surface morphology and quality. [1] One representative example is the aspheric lens that has been widely used in digital image products due to its superior performance. [2] Currently, most aspheric lenses are manufactured by cemented carbide molds following a traditional process. [3] The molds should have accurate geometric dimensions and excellent surface smoothness. Therefore, a precision polishing process is essential to improve the surface quality of the mold. Traditionally, polishing pad and grinding head are used for the polishing work, with abrasive particles added between the workpiece and the polishing pad. [4] This approach will generate nonuniform contact forces on the workpiece surface due to the accumulation of abrasive particles, thereby affecting the efficiency and uniformity in the polishing process. In addition, the polishing wheel is not small enough for polishing mold of microscale sizes due to the limitation of machine tool and tool size. To overcome the drawbacks of the traditional contact polishing method with fixed abrasive particles, it is highly demand to explore new advanced polishing approaches that can continuously gather abrasive particles into the polishing area for a long time to achieve constant material removal rate. Electrorheological (ER) fluid is a smart material that can be controlled to change the rheological property and viscosity reversibly under an external electric field. [5-9] The rheological behaviors can be easily altered with the application of an electric field and return to its original viscosity when the electric field is removed. [10] The ER fluid generally consists of two phases: solid particles with good dielectric properties as the dispersed phase and non-conducting liquids as the continuous phase. [11] The dispersed particles are usually inorganic materials that have high dielectric constants and strong polarization properties. However, the liquid continuous phase has a relatively lower permittivity and insulation properties. Without electric field, the dispersed particles are freely suspended in the continuous fluid phase, exhibiting properties similar with Newtonian fluids. After an electric field is applied, the dispersed solid particles will be polarized, thereby forming particle chains along the direction of the applied electric field and transforming into a Bingham fluid state. [12-14] ER fluid has been explored for polishing processing of precision products. For example, Kaku et al. and Kuriyagawa et al. first mixed ultra-fine abrasives particles into the ER fluid to show almost the same rheological property as ER particles and applied the ER fluid with diamond, Al 2 O 3 , or SiC particles for optical microlenses. [2,15] Following that, extensive studies investigated the performance of electrorheological fluid-assisted polishing (ERFP), including the behavior of dispersed particles,...

show abstract

Section: Figurementioning

confidence: 99%

Ultra‐Precision Processing of Conductive Materials via Electrorheological Fluid‐Assisted Polishing

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The rheological properties such as apparent viscosity and yield stress are greatly enhanced by applying external electric fields. 72 The ER polishing slurry is changed from liquid to visco-plastic solid instantly. 73– 75 Suspended dielectric ER particles of the ER fluid become polarized owing to the application of electric field.…”

Section: Precision Finishing Techniques Used For Fabrication Of Opticmentioning

confidence: 99%

Review of several precision finishing processes for optics manufacturing

Ghosh

Sidpara

Bandyopadhyay

2018

Journal of Micromanufacturing

View full text Add to dashboard Cite

The ultrasmooth optical components with atomic-order surface roughness and nanometre-level shape accuracy are in immense demand with the rapid advancement of modern optical technology. In recent years, aspherical and free-form surfaces are gaining more interest for its favorable properties. Moreover, the new optical materials with immensely enhanced mechanical properties are being developed to meet the stringent requirements of modern optics. Fabrication of complex-shaped ultrasmooth optical components becomes a significant challenge as conventional finishing techniques are unable to machine aspherical or free-form surfaces precisely. This situation demands some highly deterministic finishing processes. Mostly, the optical components are fabricated by shaping or pre-finishing methods followed by final finishing processes. In the shaping or pre-finishing methods, the rigid abrasive tools are used to remove the material at an enhanced rate and near net shape of the elements can be attained. Surface finish and shape accuracy can also be improved to some extent. Owing to the presence of residual finishing marks generated by shaping methods, the application of the components is limited to the infrared (IR) optics. Final finishing processes include more deterministic and flexible polishing techniques that can achieve desired surface finish, figure accuracy and surface integrity to make it suitable for shorter wavelength applications. In recent years, single point diamond turning, precision grinding, plasma chemical vaporization machining and magnetorheological fluid-based finishing are widely used for fabricating ultrasmooth optics. In this article, principle, mechanism of material removal and applicability of the aforementioned precision finishing processes to different materials are discussed.

show abstract

“…Rheological transitions of ER fluids are attributed to the particulate microstructures in the suspensions in that they are rapidly and reversibly arranged from a well‐dispersed state to chain‐ or column‐like structures along the direction of the electric field. Such a transition property of ER fluids has led to investigations of their applications, including automotive dampers, engine mounts, clutches, robotic elements, haptic devices and polishing . However, the response effect (e.g.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in smart polymer composite particles in electric and magnetic fields

Liu

Choi

2012

Polymer International

View full text Add to dashboard Cite

Electrorheological (ER) and magnetorheological (MR) fluids based on electro‐ and magneto‐responsive particles, respectively, are smart suspensions with the ability to undergo phase transitions from a liquid‐like to a solid‐like state as a result of stimuli of an electric or magnetic field. The application of polymer composite materials rather than pure polymeric or inorganic materials is aiming to solve the problems in the use of both ER and MR materials, such as low activity, physical and chemical stability, and production cost. Various fabrication methods of polymer composite materials with electro‐activity or magneto‐activity developed and effectively applied in this field to boost the wide commercialization of both ER and MR fluids are briefly reviewed in this perspective. © 2012 Society of Chemical Industry

show abstract

An investigation of effective area in electrorheological fluid-assisted polishing of tungsten carbide

Cited by 30 publications

References 15 publications

Ultra‐Precision Processing of Conductive Materials via Electrorheological Fluid‐Assisted Polishing

Ultra‐Precision Processing of Conductive Materials via Electrorheological Fluid‐Assisted Polishing

Review of several precision finishing processes for optics manufacturing

Recent progress in smart polymer composite particles in electric and magnetic fields

Contact Info

Product

Resources

About