The machining accuracy of the new mold mainly has three aspects: dimensional tolerance, geometric tolerance and surface roughness. The processing accuracy requirements we usually put forward for mold manufacturers are mainly dimensional tolerances and surface roughness. Dimensional tolerances are roughly divided into: outline size and cavity size. The two types have relatively loose requirements on the external dimensions of the mold. The actual processing size and the theoretical size error of the mold drawing do not exceed ±1.5mm. The dimensional accuracy requirements of the face cavity must be strictly controlled according to the drawings, generally not exceeding 0~0.1mm. The mold surface accuracy we refer to generally refers to the surface roughness. After processing, the mold cavity roughness is generally required, and the rest is. We can propose the corresponding mold surface machining accuracy according to the actual product surface requirements.