CAJ | 학술논문

采用焊合区网格重构技术，解决包括分流与焊合过程的空心型材分流模挤压成形全过程温度场模拟问题，以一种典型大断面铝合金空心型材分流模挤压成形为实例，分析挤压速度和坯料温度对模孔出口处型材最高温度及型材横断面温度分布的影响，提出合理的坯料温度和挤压速度范围。结果表明：挤压速度对模孔出口处型材横断面温度分布不均匀性的影响较大，而坯料温度的影响较小：当挤压速度由0.6 mm/s增大到3.0 mm/s，坯料温度为500℃时，模孔出口处型材横断面上最高与最低温度的差值(最大温差)由28℃增大到60℃；而当挤压速度一定，坯料温度在480~520℃变化时，型材横断面上最大温差的变化不超过3℃。6005A型材的合理挤压条件：坯料温度520℃时，挤压速度范围为0.63~0.93 mm/s；坯料温度500℃时，挤压速度范围为0.87~1.14 mm/s；坯料温度480℃时，挤压速度范围为1.10~1.34 mm/s。
채용한합구망격중구기술，해결포괄분류여한합과정적공심형재분류모제압성형전과정온도장모의문제，이일충전형대단면려합금공심형재분류모제압성형위실례，분석제압속도화배료온도대모공출구처형재최고온도급형재횡단면온도분포적영향，제출합리적배료온도화제압속도범위。결과표명：제압속도대모공출구처형재횡단면온도분포불균균성적영향교대，이배료온도적영향교소：당제압속도유0.6 mm/s증대도3.0 mm/s，배료온도위500℃시，모공출구처형재횡단면상최고여최저온도적차치(최대온차)유28℃증대도60℃；이당제압속도일정，배료온도재480~520℃변화시，형재횡단면상최대온차적변화불초과3℃。6005A형재적합리제압조건：배료온도520℃시，제압속도범위위0.63~0.93 mm/s；배료온도500℃시，제압속도범위위0.87~1.14 mm/s；배료온도480℃시，제압속도범위위1.10~1.34 mm/s。
The precision simulation problem of the temperature field of hollow profile during the whole extrusion process, including the dividing and welding stages, was solved by mesh reconstruction technology of welding zone. Taking the porthole die extrusion of a typical aluminum hollow profile with large cross section as an example, the effects of billet temperature and extrusion speed on the maximum temperature of profile near the die exit and the temperature distribution on cross section were analyzed, and the reasonable billet temperature and extrusion speed were obtained. The results show that, the influence of the extrusion speed on the inhomogeneous temperature distribution of the cross section of the profile near the die exit is significant, while the influence of the billet temperature is not obvious. When the constant billet temperature is 500 ℃, the difference of the highest and lowest temperature (maximum temperature difference) on the profile cross-section increases from 28℃to 60℃with the extrusion speed increasing from 0.6 mm/s to 3.0 mm/s. The changes of maximum temperature difference on the profile cross section are not more than 3 ℃ with the billet temperature varying from 480℃to 520℃at constant extrusion speed. The extrusion conditions are that when the billet temperatures are 520, 500 and 480℃, the reasonable extrusion speed ranges are 0.63~0.93 mm/s, 0.87~1.14 mm/s and 1.10~1.34 mm/s, respectively.