So the hole with the inner diameter of 22 is directly processed into a hole with the diameter of 40, and an insert with the diameter of 40 is made, and the hole with the inner diameter of 22 is re-processed.

The mould made of aluminum alloy has the following characteristics:

1, good material uniformity: excellent heat treatment process, product thickness (diameter) below 300℃, strength and hardness are basically the same;

2, surface accuracy is high, reducing material waste.

3. Good machinability: the deviation of chemical composition, strength and hardness is minimum, and the phenomenon of "sticking knife" and "breaking knife" is eliminated during processing;

4, high-speed machining, almost no deformation: perfect pre-stretching (T65 1) process, completely eliminating internal stress, not easy to warp, crack and deform during machining and stress;

5. Good material compactness: unique grain refinement process ensures no Chacon, stripes, bubbles and impurities;

6. High temperature resistance: permanent deformation will not occur under the working environment of 400℃;