Notice of RetractionNumerical simulation and experiment on precision forging of driven spiral bevel gear
In this paper, the numerical simulation of precision forging on driven spiral bevel gear was explored based on its physical simulation. The forming stage and the metal flow characteristic were analyzed; thereby the process of precision forging was designed. The material was 20CrMnTi and the equipment was friction press. The workblank of driven spiral bevel gear was manufactured successfully at 950°C~1000°C. It was indicated that the numerical simulation of was reliable and effective. Moreover, the results would be beneficial to industrialization producing driven spiral bevel gears using precision forging.
Recent development of process simulation for industrial applications
Abstract Manufacturing technologies have advanced over the past decades in many areas. These include process control, manufacturing tolerances, die design, CAD/CAM and process simulation. The constant pressures on manufacturers to reduce cost, minimize lead times and improve quality are ongoing. Automotive, aerospace, energy products, fastener, metals producers and other manufacturing industries are very competitive. Margins are tight even during strong periods of the business cycle. In this paper, the application of process simulation, as applied to the forging, cold heading and heat treatment is discussed. Several applications are presented, with an emphasis on industrial cases.
Enumeration of total coliforms, fecal coliforms, and Escherichia coli in foods by hydrophobic grid membrane filter: supplementary report.
Raw, comminuted poultry meat was used to determine the specificity of the media and incubation conditions used in the hydrophobic grid membrane filter method. Confirmation rates for target colonies were 100% for total coliforms, 98% for fecal coliforms, and 97-99% for Escherichia coli. The results of total coliform enumeration in 30 pasteurized milk samples by both the hydrophobic grid membrane filter method and AOAC method 46.013-46.016 are also reported.