Guang Fu Liu

Product Life Cycle Energy Consumption Analysis Method Considering Remanufacturing

The product life cycle energy consumption model was established considering the impact of remanufacturing on the product lifecycle, and the energy consumption quantitative method was given. In order to optimize the life of a product, a method to calculate its life cycle critical point was proposed. The energy consumption model was applied to two types of gearboxes, new and remanufactured, to compare their life cycle energy, and the energy-saving design scheme optimization was achieved.

Environmental Impacts Assessment of Liquid Crystal Extraction From Wasted LCD Panels

In view of the extraction of liquid crystal from the wasted LCD panels, this paper aims to analyze the raw materials consumption, energy consumption and emissions to the environment in the extracting process based on the method of Life Cycle Assessment (LCA). The environmental impacts of the recycling procedure are assessed with the aid of LCIA（Life Cycle Inventory Assessment）method and CML2001 method provided by LCA analyzing software Gabi 4. Two ways of liquid crystal extraction mentioned in the paper are supercritical method and distilling method. The assessment results indicate: the supercritical method’s LCIA result is 3 times higher than the distilling method, but the liquid crystal extracting rate can reach 95% with a lower raw materials consumption; the environmental impacts of distilling method is lower than supercritical method, but its extracting rate of liquid crystal can only get to 50%. For industrial applications, supercritical method has greater advantages and there are more crafts to perfect for distilling method in improving the recovery rate of liquid crystal.

Experimental Study on Indium Recovery from Discarded TFT-LCD Panels

With the rapid development of the technology of liquid crystal display, LCDs have become the main stream displays. However, if there are no appropriate ways to recycle the discarded LCDs, the environment will be polluted and the resources will be wasted. TFT-LCD panels mainly consist of the color filter (CF) substrate and the thin film transistor (TFT) substrate which both have a surface covered with indium-tin oxide (ITO). ITO layer contains the metal of indium which is rare, precious and of high value. In view of the difference of the structure and material of the CF substrate and TFT substrate, an efficient and green process has been presented for recycling the indium by means of theoretical analysis and experimental verification. Under heating condition, the sodium hydroxide solution is used to dissolve the color filter of the CF substrate and the ITO layer attached to the color filter can be eliminated quickly and the metal indium can be enriched by filtering solution. By grinding the ITO layer on the TFT substrate with the aid of water-proof sand paper and collecting ITO scraps, indium can also be enriched quickly. The experiments show that the indium content of the CF substrate and TFT substrate are both quite low. Enriching indium on the premise of not dissolving indium is beneficial to the concentrated recovery of indium and is helpful to raise the recycling efficiency and protect the environment.

FEM Analysis of Stress on Shaft-Sleeve Interference Fits

Interference fit is one of the principal difficulties during Remanufacturing. Research on shaft–sleeve interference fits stress characteristics and influencing factors are very important for the study on remanufacturing disassembly method. Different interference, shaft diameter, wall thickness and mating length are taken into account and various FEM contact analysis calculations were carried out by orthogonal test. The relationship between influencing factors and contact stress were also investigated with the stepwise multiple regression analysis, optimum regression equation was established and analyzed by response surface method. The analysis result shows that interference is the most significant factor that affecting the contact stress

Study on Controlled Decomposition and Reuse of Waste Thermosetting Phenol Resin Based on Physical Methods

Various mechanical forces are used to promote the waste thermosetting phenol resin to produce the physical decomposition process. The molecular structure and physicochemical properties change, thus it obtains the reversible thermos plasticity and restore the processing performance. The paper proposes the regeneration principle based on physical methods, and smashing and regeneration experiments have been carried out. The optimized design for important factors of rotational speed, crushing time, feed, feed size and other parameters which impact crushing and regenerating effects has been carried out after experiments. Multivariate quadratic simulation equations are established and the order of significantly affecting the regeneration is determined.

Dissolution of Tungsten Carbide in Remanufacturing Coating by Plasma Spray Welding

The tungsten carbide reinforced Ni-based alloy composite coatings are prepared on the surface of 45 steel by plasma spray welding in back feeding method. The dissolution of Ni-based WC composite coatings was investigated. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy diffraction spectrum (EDS) were used to examine the microstructure and composition of the coatings. The results show that the WC particles are well-distributed in the matrix. The WC particles have a good wettability with Ni-based substrate. In the spraying process, the WC particles have been dissolved obviously, and the diffusion occurs between the WC particles and Ni-based substrate. The surface of the coatings has a microstructure consisting of WC, W2C, Fe7C3, Cr7C3 and γ- (Fe, Ni) solid solution. The hardness increases from the matrix to the surface of coatings and is up to 2311 HV.

Method for Mapping from Thermal Comfort Requirements to Energy Design Factors of Air-Conditioning

In order to satisfy human thermal comfort requirements (TCRS), meanwhile, optimize air-conditioning energy property in use stage as design objective, a model of mapping from TCRS to energy design factors (EDFs) of air-conditioning based on house of quality was presented. Through determining the elements of TCRS, analyzing the relevance information between the TCRS and energy property, and extracting EDFs of air-conditioning in use stage, the connection with TCRS, air-conditioning energy characteristics and EDFs were illustrated by the house of quality. The importance degree of EDFs was calculated by using rough number and fuzzy mathematics, and so that the mapping from TCRS to EDFs of air-conditioning was realized.

Development of Fast and Non-Destructive Disassembling Equipment for LCD Framework

A lot of scrap LCD green recycling and resource issues have become one of the research hot spots. Whether recovering the internal resources or repairing the internal components, the framework of LCD must be disassembled at first. After analyzing the connections of the LCD framework, a kind of safe, efficient, fast and non-destructive dismantling equipment has been presented in the article. The equipment has the advantages such as non-destruction, good reusability, high degree of automation and quick-and-easy operation. The same model mass dismantling of the LCD frames can be fulfilled in this equipment efficiently.

Influence of Heat Treatment on the Microstructure and Properties of 7Cr17Mo Martensitic Stainless Steel

This paper describes the influence of heat treatment process on the microstructure and properties of a new martensitic stainless steel, which contains 0.7% carbon, 17% chromium and 1% molybdenum and can be used as kitchen knives and scissors. The microstructure and properties of the tested alloys after quenching at 980 - 1100 °C and low tempering were investigated by means of optical microscope (OM), scanning electron microscope (SEM), Rockwell hardness tester and impact tester. The results show that the microstructure consists of acicular martensite, carbides and a litter retained austenite after quenching and tempering. The carbides are mainly (Fe,Cr)23C6. The content of retained austenite increases with the increase of the quenching temperature. The solubility of carbon in martensite changes similarly. The martensite gets coarser as the quenching temperature increasing. The maximum value of hardness is 59 HRC, when the quenching temperature is 1060 °C. The impact toughness increases when the quenching temperature increases from 980 °C to 1080 °C and then decreases. The suitable heat treatment process for this alloy is quenching at 1060 °C~1080 °C for 30 min and then tempering at 200°C.

FEM Analysis of Hydraulic Dismantling Feasibility on Shaft-Sleeve Interference Fits

According to different diameter of shaft, sleeve thickness, contact length and groove width, various FEM contact analysis calculations were carried out by orthogonal test method in two states -the initial state and the pressurized state- at the oil groove. Then, regression analysis method is applied for data processing to the total deformation and different positions of axial, radial deformation about the model. The analysis result shows that hydraulic dismantling feasibility can be achieved under the precondition of ensuring the strength requirements.