Case Study
Core shifting analysis of a coolbox external part
![](https://static.wixstatic.com/media/ad86f4_1faffcd09cb54c1e823d0f71a5b0cf22~mv2_d_5312_2988_s_4_2.jpg/v1/crop/x_857,y_0,w_3359,h_2988/fill/w_279,h_248,al_c,q_80,usm_1.20_1.00_0.01,enc_auto/ad86f4_1faffcd09cb54c1e823d0f71a5b0cf22~mv2_d_5312_2988_s_4_2.jpg)
![](https://static.wixstatic.com/media/ad86f4_f4f570828c0d4d929afcc89de4976a26~mv2_d_5312_2988_s_4_2.jpg/v1/crop/x_1264,y_256,w_3102,h_2652/fill/w_290,h_248,al_c,q_80,usm_1.20_1.00_0.01,enc_auto/ad86f4_f4f570828c0d4d929afcc89de4976a26~mv2_d_5312_2988_s_4_2.jpg)
![](https://static.wixstatic.com/media/ad86f4_2e28b232ca764182bd28c60841d342a7~mv2_d_5312_2988_s_4_2.jpg/v1/crop/x_504,y_402,w_3078,h_2555/fill/w_299,h_248,al_c,q_80,usm_1.20_1.00_0.01,enc_auto/ad86f4_2e28b232ca764182bd28c60841d342a7~mv2_d_5312_2988_s_4_2.jpg)
The box shown above is a double-walled isolation box. The part could not be correctly filled, as a large hole apeared on both sides of the box.
Two phases of analysis were made.
Phase 1 was Moldflow analysis to review the flow pattern and the pressure in the internal side of the mold wall.
To the right, 1/4 of the part filling is shown.
The filling pressure was calculated and applied during the 2nd phase of the analysis.
![](https://static.wixstatic.com/media/ad86f4_23aaf0be4d814fde82e6463fc7a5bb61~mv2.gif)
![](https://static.wixstatic.com/media/ad86f4_6c7a4a6b619f4f1b8141acc1c151bd6d~mv2.gif)
Phase 2 was a stress analysis on the geometry of the mold core and the pressure calculated during plastic flow was applied on the mold wall.
To the left, a deformation can be seen. The maximum deformation is 2 mm—the same thickness of the plastic wall.
The solution in this case was changing the gate location, since the formation of support holes was not aesthetically acceptable.