The sidewalls of thin-walled deep cavity components can easily deform during the milling process because of their low rigidity, which seriously affects the machining accuracy. To resolve this problem, this paper proposes a novel method to predict milling errors based on the finite element method (FEM). A dynamic model of the tool is first established, and the motion state of an arbitrary point on the tool during the continuous milling process is obtained by solving for the key parameters. In addition, both the deflection of the workpiece/tool system and the springback deformation of the workpiece are considered. The material is then removed based on a Boolean operation and a hexahedral mapping algorithm for the points; finally, the continuous tooling process and the milling error of the arbitrary point on the finished surface are obtained. This study uses a typical waveguide cover as the simulation object and verifies the veracity of the simulation method through experiments.

Simulation of the deformation caused by the machining cutting force on thin-walled deep cavity parts

Multi-modal method for chatter stability prediction and control in milling of thin-walled workpiece

A quadruple biomimetic hydrophilic/hydrophobic Janus composite material integrating Cu(OH)2 micro-needles and embedded bead-on-string nanofiber membrane for efficient fog harvesting

Emerging MXene/cellulose composites: Design strategies and diverse applications

Although atmospheric water harvesting is a promising approach for extracting clean water in water deficient areas, most atmospheric water collectors require additional energy for releasing the water absorbed. It is still challenging to improve both moisture absorption capacity and desorption efficiency of moisture water collectors. Inspired by clean solar energy and the large humidity difference between day and night, super-hygroscopic calcium chloride (CaCl2)/graphene oxide (GO)/poly(N-isopropylacrylamide) (PNIPAM) gels are designed for spontaneous collection of atmospheric water in a wide range of relative humidity (RH) followed by solar-driven release of the water absorbed. An optimal CaCl2/GO/PNIPAM hygroscopic gel possesses a hierarchical porous structure with directional water transport channels, facilitating water capture and release, thus exhibiting a high moisture absorption capacity of up to 3.6 g g-1 at an RH of 90%. Driven by simulated sunlight, the solar-thermal energy conversion effect of the GO component triggers a unique hydrophilic-hydrophobic conformational transition and shrinkage of the PNIPAM for efficient release of the water absorbed. The integration of the spontaneous harvesting of atmospheric water and the solar-driven water release makes the super-hygroscopic gels promising for efficiently utilizing atmospheric water for special applications where water is desperately necessary but unavailable.

Super-Hygroscopic Calcium Chloride/Graphene Oxide/Poly(N-isopropylacrylamide) Gels for Spontaneous Harvesting of Atmospheric Water and Solar-Driven Water Release.

Hydrogel materials for sustainable water resources harvesting & treatment: synthesis, mechanism and applications

Progress of cyclodextrin based membranes in water treatment: special 3D bowl-like structure to achieve excellent separation

The interface is a fundamental and crucial research topic throughout the development of carbon fiber reinforced polymer composites. However, it is a huge challenge to solve the problem of fiber surface inertness thoroughly to enhance the interfacial bonding with the resin, especially for high modulus carbon fibers with higher degree of graphitization and fewer microcrystalline active points for commercial production. This manuscript reports that different monomers were selected to in situ electrografting on the fiber surface to design and control the physical/chemical structure and rigidity/flexibility of the interface. The interfacial bonding performance of the composites was greatly improved, interlaminar shear strength (ILSS), interfacial shear strength (IFSS) and transverse fiber bundle tensile strength (TFBT) were increased by 15.9%, 46.8% and 39.6%, respectively, and the tensile strength of the single fiber was also increased by 12.7%. This simple, efficient (1–3min), environmental (water as solvent) and economical method shows great application prospects of fiber surface treatment technology in the next generation. 

Controllable construction of gradient modulus intermediate layer on high strength and high modulus carbon fibers to enhance interfacial properties of epoxy composites by efficient electrochemical grafting

Turn-milling is regarded as the milling of a curved surface while rotating the workpiece around its center point, which combines effectively the advantages of both turning and milling, wherein it allows for good metal removal with the difficult-to-cut thin-walled workpieces in aviation. The objective of the present work is to study cutting force by turn-milling in cutting condition. Aiming at the deformation properties of thin-walled blade, the predicted models of rigid cutting force and flexible cutting force with ball cutter are provided, respectively, in turn-milling process. The deformation values of blade and cutter are calculated, respectively, based on the engaged trajectory by using the iterative algorithm. The rigid and flexible cutting forces are compared and the influence degrees of cutting parameters on cutting forces are analyzed. These conclusions provide theoretical foundation and reference for turn-milling mechanism research.

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Research on Cutting Force of Turn-Milling Based on Thin-Walled Blade

Epoxy adhesives that combine flexibility, high-temperature adhesion property, and medium–low-temperature curing ability are an urgent need in the microelectronic device era. Unfortunately, it is still a challenge so far. In this context, two kinds of curing agents are combined to construct homogeneous rigid–flexible crosslinking networks via the stepwise curing method for preparing an epoxy adhesive with prominent deformation ability and high-temperature adhesive strength. Detailed analysis showed that the crosslinking network constructed by the stepwise curing method was higher and more homogenous than that of the one-step curing method. Benefitting from the homogeneous rigid–flexible crosslinking network, the elongation at break and high-temperature adhesion strength (200 °C) of the epoxy adhesive prepared by the stepwise method were up to about 100% and 1.60 MPa, respectively, which were about 1677.7 and 112.5% higher than those of the epoxy adhesive cured by the one-step curing method. The epoxy adhesive with medium–low-temperature curing ability, excellent flexibility, and high-temperature adhesion was first reported. It is expected that this work could provide some inspiration to design the special epoxy adhesives. 

Zhiwei Xu

Papers

Hydrogel materials for sustainable water resources harvesting & treatment: synthesis, mechanism and applications

Progress of cyclodextrin based membranes in water treatment: special 3D bowl-like structure to achieve excellent separation

Controllable construction of gradient modulus intermediate layer on high strength and high modulus carbon fibers to enhance interfacial properties of epoxy composites by efficient electrochemical grafting

Research on Cutting Force of Turn-Milling Based on Thin-Walled Blade

Super-Flexibility and High-Temperature Adhesion of Epoxy Structural Adhesives Endowed by Homogeneous Rigid–Flexible Crosslinking Networks