Abstract: During manufacturing processes, firstly the raw materials are mined or recovered from ore. Then the raw materials are machined to obtain the qualified component. In this paper, energy consumption of manufacturing processes is calculated. During the manufacturing processes, usually several stages are needed, which are rough machining, semi-finish machining and finish machining. After each stage is finished, the components are inspected and classified into three groups: (1) those below the specification, (2) those within the specification, (3) those above the specification. For each category, the corresponding energy consumption is calculated. At last, the energy consumption of whole manufacturing processes is obtained.
Abstract: In this study an experimental device capable of producing uniform metal droplet stream with image gathering was set up. A periodic vibration was applied to a compound liquid jet for an experimental study on its breakup. The breakup processes of the compound jet were discussed from the image taken from the experiment. The aim is to study the relationship of the factors which determine the jet breakup into a series of uniform droplets.
Abstract: Tool path generation, post-processing and verification and simulation of NC program are key technologies which are investigated in this research for manufacturing impellers. Generation of tool path aims at producing the cutting tool path. Post-processing transforms the cutter location file (CLSF file) of the tool path to the NC code which NC machine can recognize. Verification and simulation of NC program aims at proving the accuracy of program, thus the interference and collision can be avoided. When tool path is planned, increasing the machining efficiency during the rough and semi-finish milling process is the main consideration. Increasing machining accuracy is an important consideration for final finish milling.
Abstract: In order to improve cutting tool wear resistance, non-smooth surface was applied on HSS cutting tool and finite element method was used to analyze the wear of non-smooth surface HSS cutting tools. The orthogonal simulation test was established to analyze the influence of parameters on tool wear and the relationship between parameters and tool wear was discussed. Simulation results show that non-smooth surface could significantly improve the wear resistance of cutting tool. The line space has the most influence on cutting tool wear. The ranking of parameter influence on tool wear are line spacing, pit diameter and column spacing. And the lower tool wear usually occurs at points of pit line space which is three times as pit diameter.
Abstract: Edge preparation is a process to modify edge geometry and surface integrity of cutting tools. Edge preparation experiments of tungsten carbide cutting tools were carried out through an abrasive nylon brushing method. Tools wear and cutting temperatures with different edge radius were simulated with FEM software. The experimental results show that cutting edge defects were eliminated through brushing edge preparation. The edge radius has influences on cutting tool performance. When the edge radius is 20μm, the least wear can be obtained. Then tool wear value increases with the edge radius. A suitable edge radius will have a reasonable cutting temperature distribution. The tool temperature distribution shows the same results as tool wear. A suitable edge radius range is needed for edge preparation and a reasonable edge radius is needed to improve tool life.
Abstract: The force-position decoupling technology based on Magnetorheological Fluid Torque Servo (MRT) can effectively solve the force-position coupling problem existed commonly in polishing processes. In the new polishing system, polishing force is not generated directly by the displacement of polishing tool, but provided by the MRT. Polishing path planning is another key point of the force-position decoupling technology. In this paper, a polishing path planning method was proposed, and the effect of polishing tool path on polishing parameters was analyzed. The law obtained will guide the uniform material removal of aspheric surfaces.
Abstract: The effect of misch metal and silicium additions to AZ31 magnesium alloy on the microstructure was investigated in this study. The results showed that needle shape Al11RE3 phase and polygonal type Mg2Si phase formed when misch metal and silicium were added to AZ31 magnesium alloy, which providing refined microstructure compared to AZ31 magnesium alloy. The coarse Chinese script type Mg2Si phase is not found. In addition, the β-Mg17Al12 phase completely divorced and formed many white particle phase. Based on the present experiment , the optimal additions of RE and Si were 0.5 wt% and 0.4 wt%, respectively.
Abstract: Assembly is an important manufacturing process, and automatic assembly is an inevitable trend in the development of assembly technology, where robotic assembly is the major form of automatic assembly. This paper aims at key links of robotic assembly, such as parts feeding, gripping, inserting and jointing etc, analyzing the exiting problems, and proposing the specific solutions. Human-robot cooperative assembly was also discussed.
Abstract: Rolled-piece end quality is one of key factors to decide material utilization ratio in cross wedge rolling (CWR). Good workpiece end quality can improve material utilization ratio effectively. In the paper, by adding the block wedge near the end of mould, it can block surface metal which flows faster in the axial direction and avoid the end concavity of rolled piece. The material loss will not be present and good end quality rolled piece will be produced. The results are significant for improving material utilization ratio and promoting applications of CWR.
Abstract: The shortage of resources and environmental pollution are serious problems that we are facing currently. To form a Green re-manufacturing industry chain, we need to build a running mode of “1+X”. “1” means to establish a Green re-manufacturing industry chain, and energetically develop the green development model, which is a re-manufacturing technology based on “symbiosis coupling and extending the industrial chain link”. It also means to achieve green circulation of multi-life cycles, initially set up logistics alliances of re-manufacturing, make maximum use of resources, and reduce the environmental pollution as well. “X” means relevant safeguard mechanisms, which refers to technology, system, supervision, incentive, and so on.