1) No scratches, dents, cracks, burrs, corrosion and other defects on the surface of the mold, mold base and its parts.2) The hardness of the parts after heat treatment should be uniform, and defects such as decarburization, soft spots, oxidation spots, and cracks are not allowed. After heat treatment, oxide scale, dirt and oil should be removed.3) Equipped with a universal mold base, both sides should be ground at the same time after assembly to ensure that the mold can be installed in the mold base smoothly.4) The mold cooling channel should be smooth.