论文部分内容阅读
以医疗用17-4PH不锈钢导引衬套的射出成型加工过程为例,探讨了金属在射出成型过程中所产生的黑痕与熔接线现象;建立数学模组分析了射出成型阶段的射出速度、保压压力、料温、模温等工艺参数对黑痕与熔接线的影响。并运用反应曲面法(RSM)并结合连续近似最佳法(SAO)来获取17-4PH不锈钢最佳化生产品质之工艺参数。结果表明,保压压力对于黑痕面积的影响远大于射出速度对其影响,但射出速度的提高不利于减少黑痕面积;在低的模温和高的料温下,黑痕面积出现最小值;而在高的模温和料温下,熔接线的区域则最小。工艺参数优化后,其生坯表面所形成的黑痕与熔接线面积较初始值分别减少了78.81%和83.85%。
Taking the injection molding process of 17-4PH stainless steel guide bush for medical treatment as an example, the phenomenon of black mark and welding line produced by metal during injection molding process was discussed. The mathematical model was established to analyze the injection speed of injection molding stage, Packing pressure, material temperature, mold temperature and other process parameters on the black mark and weld line. The reaction surface methodology (RSM) was used in combination with the continuous approximation (SAO) method to obtain the optimum process parameters of 17-4PH stainless steel. The results show that the effect of dwell pressure on the area of black marks is much larger than that of the discharge area. However, the increase of injection speed is not conducive to reducing the area of black marks. At low mold temperature and high material temperature, In the high mold temperature and material temperature, the weld line area is the smallest. After the process parameters were optimized, the black mark and weld line area formed on the green surface decreased by 78.81% and 83.85% respectively compared with the initial values.