A cooling jig can stabilize a part, but an incorrect contact pattern can emboss the surface, hold one region while another shrinks, or force the part into a dimension that changes after removal. Soft surfaces are especially sensitive to pressure points and contamination.
The jig should contact defined structural areas and accommodate predictable shrinkage. Marks that follow pads or locator edges confirm excessive local pressure, temperature, or dwell. Dimensional rebound after the part leaves the jig indicates that the fixture imposed shape rather than supporting natural cooling.
Contact surfaces should be clean, smooth, temperature-resistant, and distributed over sufficient area. Locators must control the required datums without locking every direction. Jig temperature and part residence time should be included in the process specification.