Synchronous rolling-casting freeform manufacturing for Metal(SRCFMM) means that the refined liquid metal is continuously pressed out from the bottom of crucible. There is a horizontal movable plate beneath the outlet....Synchronous rolling-casting freeform manufacturing for Metal(SRCFMM) means that the refined liquid metal is continuously pressed out from the bottom of crucible. There is a horizontal movable plate beneath the outlet. The clearance between the outlet and the plate is about several hundred micrometers. SRCFMM, similar to additive manufacturing, implies layer by layer shaping and consolidation of feedstock to arbitrary configurations, normally using a computer controlled movable plate. The primary dendritic crystal is easily crushed by movement of substrate in the rolling-casting area. ZL104 was used as the test materials, determining the control temperature by differential scanning thermal analysis(DSC), preparing a kind of samples by SR CFMM, then analyzing microstructures and mechanical property of the samples. Characteristics and distribution of the primary particles were assessed by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectrum(EDS) and image analysis software. Mechanical property of the samples was assessed by vickers hardness. The results show that the samples fabricated by SRCFMM have uniform structures and good performances with the velocity of the substrate controlled about 10 cm/s and temperature at about 580 ℃.展开更多
Recent reports about economic and technological developmentdistrict brought me an idea to visit Wang Deye of director of Ad-ministration Commission of Guangzhou Economic and Technol-ogy District (GETDD).The reports ga...Recent reports about economic and technological developmentdistrict brought me an idea to visit Wang Deye of director of Ad-ministration Commission of Guangzhou Economic and Technol-ogy District (GETDD).The reports gave me a definite informa-tion:There is a new shock wave of pioneering cause in GETDD.The development trend can not be held back and the zone willmarch ahead of all economic and technological development zonesin China again.Facing the new shock wave,how will people of GETDD reactand to add their achievements for a better future?After the removing of the "favorable policy" granted by Cen-tral government,how will they open a new sea route of "systemdrive" in the second poneering phase?Facing the new chance of Pearl River Delta Economic Area,how will they set up its forerunner image and utmost importance?展开更多
After introducing the theories parabola （FDP）, half-wave-length length, offset and the maximum of acceleration （LCA）, the SI curve, and geometric features of four familiar transition curves （cubic parabola （CP）...After introducing the theories parabola （FDP）, half-wave-length length, offset and the maximum of acceleration （LCA）, the SI curve, and geometric features of four familiar transition curves （cubic parabola （CP）, fifth degree sinusoidal （HS） and sinusoidal （SI）） , these curves are compared under identical conditions of the first derivative of curvature. In terms of the roll acceleration （RA） and the lateral change of in theory, is superior to other transition curves.展开更多
为降低传统环模成型机的能耗,设计了一种齿辊式环模成型机,并对该成型机的运动干涉、最大攫取角进行了理论分析。结果表明按照设计尺寸运动并不干涉,最大攫取角大于普通环模;在该样机上以含水率8%～20%四倍体刺槐颗粒为原料进行了成型...为降低传统环模成型机的能耗,设计了一种齿辊式环模成型机,并对该成型机的运动干涉、最大攫取角进行了理论分析。结果表明按照设计尺寸运动并不干涉,最大攫取角大于普通环模;在该样机上以含水率8%～20%四倍体刺槐颗粒为原料进行了成型对比试验,结果表明：不同含水率下的平均比能耗为56.82 k W·h/t,成型密度为1.085 g/cm3,比同样结构的普通环模产量提高了3.36%～6.25%,能耗降低5.77%,密度提高3.33%,同时发现在含水率16%、转速200 r/min时比能耗最低,为50.3 k W·h/t。展开更多
基金Funded by the National Natural Science Foundation of China(No.51341009)
文摘Synchronous rolling-casting freeform manufacturing for Metal(SRCFMM) means that the refined liquid metal is continuously pressed out from the bottom of crucible. There is a horizontal movable plate beneath the outlet. The clearance between the outlet and the plate is about several hundred micrometers. SRCFMM, similar to additive manufacturing, implies layer by layer shaping and consolidation of feedstock to arbitrary configurations, normally using a computer controlled movable plate. The primary dendritic crystal is easily crushed by movement of substrate in the rolling-casting area. ZL104 was used as the test materials, determining the control temperature by differential scanning thermal analysis(DSC), preparing a kind of samples by SR CFMM, then analyzing microstructures and mechanical property of the samples. Characteristics and distribution of the primary particles were assessed by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectrum(EDS) and image analysis software. Mechanical property of the samples was assessed by vickers hardness. The results show that the samples fabricated by SRCFMM have uniform structures and good performances with the velocity of the substrate controlled about 10 cm/s and temperature at about 580 ℃.
文摘Recent reports about economic and technological developmentdistrict brought me an idea to visit Wang Deye of director of Ad-ministration Commission of Guangzhou Economic and Technol-ogy District (GETDD).The reports gave me a definite informa-tion:There is a new shock wave of pioneering cause in GETDD.The development trend can not be held back and the zone willmarch ahead of all economic and technological development zonesin China again.Facing the new shock wave,how will people of GETDD reactand to add their achievements for a better future?After the removing of the "favorable policy" granted by Cen-tral government,how will they open a new sea route of "systemdrive" in the second poneering phase?Facing the new chance of Pearl River Delta Economic Area,how will they set up its forerunner image and utmost importance?
基金The National Natural Science Foundation of China(No.50878134)the Natural Science Foundation of Hebei Province(No.E2006000394)the Natural Science Foundation of Hebei Education Department(No.2006142)
文摘After introducing the theories parabola （FDP）, half-wave-length length, offset and the maximum of acceleration （LCA）, the SI curve, and geometric features of four familiar transition curves （cubic parabola （CP）, fifth degree sinusoidal （HS） and sinusoidal （SI）） , these curves are compared under identical conditions of the first derivative of curvature. In terms of the roll acceleration （RA） and the lateral change of in theory, is superior to other transition curves.
文摘为降低传统环模成型机的能耗,设计了一种齿辊式环模成型机,并对该成型机的运动干涉、最大攫取角进行了理论分析。结果表明按照设计尺寸运动并不干涉,最大攫取角大于普通环模;在该样机上以含水率8%～20%四倍体刺槐颗粒为原料进行了成型对比试验,结果表明：不同含水率下的平均比能耗为56.82 k W·h/t,成型密度为1.085 g/cm3,比同样结构的普通环模产量提高了3.36%～6.25%,能耗降低5.77%,密度提高3.33%,同时发现在含水率16%、转速200 r/min时比能耗最低,为50.3 k W·h/t。
