The influence of different pouring temperatures is shown in Figure 1. Pouring temperature has certain influence on lost foam casting, and the stress concentration occurs at the round hole near the riser. When the pouring temperature is 1600 ℃ and 1560 ℃, the maximum effective stress is 232 MPa and 230 MPa respectively.
It can be seen that the effective stress of lost foam castings increases with the increase of pouring temperature. In order to study the stress change more deeply, four observation points, point 16765, point 18046, point 23060 and point 30796, are selected on the lost foam casting as shown in Figure 2.
The temperature curve trend of each point of lost foam casting at different pouring temperatures is basically the same. The temperature at point 18046, which is far from the pouring riser, decreases the fastest, and points 16765 and 30796 are relatively close. The trend of stress curve at each point is different. According to the temperature curve, point 18046, far away from the riser, is the first to solidify, with the minimum stress, and point 30796, near the riser, with the maximum stress. Compared with the simulation results, it can be seen that due to the slow solidification near the riser, the stress concentration is easy to occur.