Metal injection molds are generally used for the production of small parts, and the mold size is very small. In normal use, as long as the use area of the template does not exceed 60% of the length and width, and the depth compensation exceeds 10%, the strength calculation may not be performed. Moreover, the shape of the mold is relatively complicated, and the actual force in the cavity is also complicated. Even if multiple assumptions are made, it is difficult to obtain results using elastic mechanics and finite element methods. Therefore, mold design often adopts a tolerant method of enlarging the safety factor.

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However, for larger products or ultra-high pressure precision forming processes, the strength of the cavity should be calculated if possible. Prevents flashover and even damage due to insufficient strength and excessive deformation. For the calculation of the strength of a relatively simple shape cavity, you can refer to the design manual for plastic mold design and injection mold. Complex cavities can be analyzed and calculated using finite element or professional software.