The electromagnetic field and flow analysis model were developed to simulate the electromagnetic field and the flow pattern in a vertical curved continuous slab caster with the in-roll type strand electromagnetic stir...The electromagnetic field and flow analysis model were developed to simulate the electromagnetic field and the flow pattern in a vertical curved continuous slab caster with the in-roll type strand electromagnetic stirring. The transient electromagnetic field distribution and the induced electromagnetic force were numerically described. The effects of stirring current, stirring frequency, and different stirrer configurations on the electromagnetically driven flow field in the strand were investigated and the optimization of the stirring parameters was discussed by performing a relative comparison of numerical results. Results show that the in-roller type strand electromagnetic stirrer （S- EMS） pair generates the fluctuating magnetic fields, penetrating through the cast slab and periodically parallel shift- ing along the slab wide face w!th time evolution. The transient induced electromagnetic forces travels toward the magnetic flux shifting direction, Different stirring parameters （i. e. current and frequency） and stirrer configurations affect the stirring strength and the flow rbcirculation pattern in the strand, which are closely related to metallurgical performances of the stirrers. There is an optimum frequency to obtain the maximum stirring. The present model pro vides a relatively theoretical insight into the in-roll type strand electromagnetic stirring system for best operating.展开更多
以乙烯基硅油、白炭黑、无机疏水填料、含氢硅油、铂金催化剂、抑制剂等为原料,制得精密铸造模具硅橡胶。研究了填料种类、填料表面处理和填料配比对模具硅橡胶力学性能、存放稳定性、操作性能、尺寸稳定性和模具使用寿命的影响。较佳...以乙烯基硅油、白炭黑、无机疏水填料、含氢硅油、铂金催化剂、抑制剂等为原料,制得精密铸造模具硅橡胶。研究了填料种类、填料表面处理和填料配比对模具硅橡胶力学性能、存放稳定性、操作性能、尺寸稳定性和模具使用寿命的影响。较佳配方为:黏度5 000 m Pa·s的乙烯基硅油100份、气相法白炭黑15份、沉淀法白炭黑25份、经疏水处理无机填料30份。由此配方制得硅橡胶的力学性能满足模具要求,模具的线收缩率仅0.037%,耐溶剂溶胀性能优异,模具使用寿命与进口模具胶相当,存放1年后力学性能变化较小。展开更多
文摘The electromagnetic field and flow analysis model were developed to simulate the electromagnetic field and the flow pattern in a vertical curved continuous slab caster with the in-roll type strand electromagnetic stirring. The transient electromagnetic field distribution and the induced electromagnetic force were numerically described. The effects of stirring current, stirring frequency, and different stirrer configurations on the electromagnetically driven flow field in the strand were investigated and the optimization of the stirring parameters was discussed by performing a relative comparison of numerical results. Results show that the in-roller type strand electromagnetic stirrer （S- EMS） pair generates the fluctuating magnetic fields, penetrating through the cast slab and periodically parallel shift- ing along the slab wide face w!th time evolution. The transient induced electromagnetic forces travels toward the magnetic flux shifting direction, Different stirring parameters （i. e. current and frequency） and stirrer configurations affect the stirring strength and the flow rbcirculation pattern in the strand, which are closely related to metallurgical performances of the stirrers. There is an optimum frequency to obtain the maximum stirring. The present model pro vides a relatively theoretical insight into the in-roll type strand electromagnetic stirring system for best operating.
文摘以乙烯基硅油、白炭黑、无机疏水填料、含氢硅油、铂金催化剂、抑制剂等为原料,制得精密铸造模具硅橡胶。研究了填料种类、填料表面处理和填料配比对模具硅橡胶力学性能、存放稳定性、操作性能、尺寸稳定性和模具使用寿命的影响。较佳配方为:黏度5 000 m Pa·s的乙烯基硅油100份、气相法白炭黑15份、沉淀法白炭黑25份、经疏水处理无机填料30份。由此配方制得硅橡胶的力学性能满足模具要求,模具的线收缩率仅0.037%,耐溶剂溶胀性能优异,模具使用寿命与进口模具胶相当,存放1年后力学性能变化较小。
