After the upper die holder and the lower die holder of the die have been installed separately and combined with the sleeve through the guide post, the gap is adjusted. Generally, the female die is fixed and the position of the male die is adjusted to achieve the purpose of adjusting the size of the gap. There are several ways to adjust the gap: ① The light transmission method is suitable for small molds. Turn the assembled mold upside down, illuminate it with light, and observe the size and uniformity of the mating gap between the punch and the die from the leaking hole of the lower die holder. (2) The gasket method is used for initial alignment. A metal gasket with uniform thickness should be placed at an appropriate position around the cutting edge of the die, and the thickness of the gasket should be equal to the single-side gap value. When the gap is large, check that more than two pieces are stacked, and observe whether the mold clamping is smooth and whether the contact between the punch and the gasket is good. If the gap is uneven, it can be adjusted by tapping. (3) Copper plating is adopted on the surface of the punch, and the coating is uniform, and the thickness is the single-sided gap value. Before copper plating, acetone is used for decontamination, and then magnesium oxide powder is used for cleaning, so that the painter will automatically fall off when stamping, and it is not necessary to remove it deliberately after assembly. (4) The coating method is suitable for small gap dies, and the surface of the punching head is coated. ⑤ Paper cutting is a method to check and accurately adjust the gap. Put a piece of paper with uniform thickness between the convex and concave dies to replace the blank, and judge the gap according to whether the periphery of the paper is cut off, whether there is burr and the uniformity of burr. ⑥ Acid etching method: firstly, the punch and the die are made into the same size, and after assembly, the punch is evenly etched with acid to meet the gap requirements. Wash with water after corrosion. ⑦ Process assembly method: first, leave a margin on the punch to make the punch and the female die have the same size, then remove the punch after assembly and correct the punch according to the gap. or vice versa, Dallas to the auditorium