Empty shell mold capable of preventing inner hole from deforming

The utility model relates to the field of empty shell workpieces, in particular to an empty shell mold capable of preventing an inner hole from deforming, which comprises an evanescent mode, the evanescent mode is of a tubular structure, the inside and the outer surface of the evanescent mode are respectively coated with a refractory layer I and a refractory layer II, the inner hole of the evanescent mode is of a special-shaped structure, and at least two groups of fixing devices are arranged on the refractory layer II. The two groups of fixing devices are distributed up and down, each group of fixing devices comprises a plurality of screws, and the screws are distributed along the length direction; the problem that an inner hole of an existing empty shell type workpiece is prone to deformation is solved. 本实用新型涉及空壳工件领域，具体涉及一种防止内孔变形的空壳模具，包括消失模，消失模为管状结构，消失模的内部和外表面分别涂覆有耐火层一和耐火层二，消失模的内孔为异形结构，耐火层二上设置有至少两组固定装置，两组固定装置上下分布，每组固定装置包括若干个螺丝钉，螺丝钉沿其长度方向分布；用来解决现在的空壳类工件内孔容易变形的问题。