Applied Mechanics and Materials Vols. 401-403

Abstract: The current pipe fitting forming process is characterized by more than one equipment and gradually formation processes, it is high misinformation, low performance, and poor versatile inferior. Therefore, an automatic integrated system about the pipe cutting, the pipe bending, the molding pipe end and the discharging is presented in this paper. The integrated system can realize the integrated numerical control, willfully combine the whole processes, and enhance the process quality. The following works have been done: design the processes schematic, optimize the integrated pipe processes, and design the integration process system structure. The research lays the rationale for the development of the integration process numerical control equipment.

Abstract: In this article, it mainly describes the use of extrusion production process as an example of the special shaft. It gives us a full analysis from the structure of the product, the material problems, the key technical problems needed to be solved, blank preparation processing and the process of extrusion forming. It also introduces the blank dimensions and the calculation method of the extrusion pressure. The method of blank lubrication processing and the process of designing extrusion mould.We are not unfamiliar with the center shaft of the bike. It is one of the important parts in bicycle bottom bracket. It is also a key part to determine the quality of the bicycle. Generally speaking, materials are used is 20 steel. The roughness of the surface is moderate. But the requirement of the product precision is high. We can get it by using mechanical processing method. But it is processing and the efficiency is low. While the utilization rate of mental material is low. So the production costs high. Because the parts production patch is large and the annual production is hundreds of thousands of pieces. In my opinion, it is more reasonable for us to adopt the technology of producing the parts with the cold extrusion precision molding process. Then we can save the materials, improve the efficiency of producing parts, lower the production parts and then meet the requirement of mass production.

Abstract: In order to improve the survival rate of the strain gauges in the oil-water mixture and pressurization environment in the static/fatigue test of aircraft fuel tank, some key installing and protecting techniques were researched. The protective performance of single and double covering with Different protective agents, the various treatment scopes on the specimen and different lengths of lead wire embedded in the protective coating were investigated in a fuel tank which was designed and manufactured specially for the contrast test. Several effective protective techniques are gained, and when these techniques are applied to the practice, a satisfactory survival rate of strain gauges is reached.

Abstract: High sharpness, abrasion resistance, superior ductility, and processability are required in cutting tool materials application. Used 304(0Cr18Ni9) austenitic stainless steel as cladding and 440(7Cr17) martensitic stainless steel as core layer to produce excellently combined stainless steel plate by hot-rolled bonding in this investigation as well as researched various heat treatment processes. The results indicated that the core layer has high hardness and the cladding layer has tiny and uniform microstructure by the method of heating at 10501070°C for 15 minutes, water-cooling , then tempering at 200°C.

Abstract: An estimation method to predict creep performances of high temperature structural materials has been proposed. The method is to use a simplified and normalized model of stress relaxation to derive creep strain rates and creep strain vs. time curves from stress relaxation measurements through an integrated analytical procedure according to the relationship between stress relaxation and creep. In order to validate the approach, the predicted results are compared to the experimental results of uni-axial isothermal creep tests conducted on 1Cr10NiMoW2VNbN steel with the same temperature of stress relaxation tests. Good agreement between results of relaxation tests and the predicted results indicates that the developed method can be recommended in the creep behavior evaluation of high temperature materials.

Abstract: Based on the principle of electromagnetic wave absorption, through the double-layer matching design and simulation analysis, taking foam cement panel as the dielectric material, combining with the resistive film, the paper has successfully prepared high-performance and broad-band foam cement absorbing panel for electromagnetic pollution control. The result shows, with the use of double-matching design that combines 140 Ω/□ resistive film with foam cement absorbing panel whose each layer thickness is 1.4 cm, in the S band , 100% of bandwidth below-10 dB and 95% of bandwidth below-14 dB can be reached, a maximum absorption of-19.6 dB at 2.45 GHz, the width of the absorption is far more than that of λ/4 type absorber. New materials can be used for the improvement of indoor electromagnetic environment and pollution control.

Abstract: The position-dependent extraordinary optical properties in near-zero-permittivity range for a one-dimensional superconducting photonic crystal consisting of alternating superconductor and dielectric layers are theoretically investigated by using the transfer matrix method. Based on the calculated reflectance spectrum, it is shown the extraordinary optical propriety depends on the relative position between the threshold wavelength and the photonic band gap. By suitably choosing the thickness of the superconducting or dielectric layer, one can design a transmission narrowband filter or resonator to satisfy their needs without introducing any physical defect in a superconducting photonic crystal.

Abstract: The tennis ball adhesive formula is optimized by studying the impact of reinforcing system, tackifier, vulcanization system and solvent on the performance of NR-based tennis ball adhesive. The optimizing formula of rubber is: NR 100, Carbon Black N220 30, ZnO 8.3, Stearic Acid 2.2, Phenolic Tackifying Resin 3, Sulfur 3, Accelerator D0.5.The adhesive made through such optimizing formula shows good performance and the finished tennis ball has excellent adhesion and air tightness, satisfying the design requirements.

Abstract: This paper introduces the basic principle of stereolithography technology, characteristics of laser rapid prototyping technology and its application in various fields, the laser rapid prototyping technology has been in the modeling industry, machinery manufacturing, aerospace, military, architecture, film and television, home appliances, light industry, medicine, archaeology, cultural art, sculpture, jewelry and other fields has been widely applied.

Abstract: The appropriate planarization layer is the foundation for realization of ion beam deposition correction polishing technology, the significant difference between ion beam deposition correction polishing technology and ordinary ion beam polishing, is using spin or methods of ion beam sputtering deposition, forming sediments which has planarization effect on the processing surface to reduce intermediate frequency error, coupled with ion beam polishing, removing the high-frequency processing error, the typical error is cut marks by single point diamond turning left on the component surface.