1) The parting surface of the mold

1) The parting surface of the mold and the joint surface of the assembly should match well, and the local gap should not be greater than 0.02mm2) When the internal and external acute angles, acute angles and rounded corners are not marked on the drawing, the rounded corners shall not be greater than 0.5mm (except parting surface and joint surface). When rounded corners are not allowed, it should be noted on the drawing.3) The general size limit deviation without tolerance specified in the drawing is processed according to the gb1804 standard, that is, the hole is processed according to H13, the shaft is processed according to H13, and the length is processed according to J14.4) The parallelism tolerance of the two pressure-bearing surfaces of each pressure-bearing plate (template) in the mold should conform to the level 5 in appendix 1 of gb1184.5) The perpendicularity tolerance of the guide post, the guide sleeve hole and the template plane should conform to the level 4 in appendix I of gb1184. The fit between the guide post and the guide sleeve should conform to H8 / F8.6) The position tolerance of the screw hole and the through hole of the screw (bolt) on the mold should not be greater than 2mm, otherwise it should match the corresponding hole.7) The coaxiality tolerance t of the major diameter and minor diameter of the guide post (straight guide post, shoulder guide post) should conform to grade 5 in appendix 1 of gb1184.8) The coaxiality tolerance t of the outer circle and inner hole of the guide sleeve (straight guide sleeve, head guide sleeve) should meet the level 5 in appendix I of gb1184.9) The center taper hole of the gate bushing should be ground and polished, and there must be no defects that affect the gate.10) Molded parts: In order to ensure the guiding effect, the accuracy of the distance between the guide post and the guide sleeve hole should be controlled within 0.01mm. Therefore, it is necessary to use a boring machine to fix the mold and the boring machine. In the absence of a coordinate boring machine, the more commonly used method is to combine movable and fixed molds to drill holes on a lathe, milling machine or boring machine. The molded parts are made of high-quality die-forged steel with high strength, good wear resistance, small heat treatment deformation, corrosion resistance, quenching and tempering, and low temperature tempering ≥55HRC.Core-making processing: CNC milling the processing path generated by computer tool processing on the surface of the molding surface, then milling small core-making holes and recesses, drilling ejector pin holes, and processing gates. Then use EDM to shape it.Cavity processing: The forming surface is processed by computer tools to generate a processing path, leaving a margin during CNC milling, and then forming by EDM.