Mold positioning pin clearance, moldFirst, the definition of the mold positioning pin
The mold positioning pin mainly acts between the screws fastened between the two parts to ensure positional accuracy. Mainly used for assembly positioning, it can also be used as an overload shear connection in a connection and relaxation level safety device. The basic form is a cylindrical pin and a tapered pin. The fixing pin is also called a positioning pin.
Second, the standard of mold positioning pin
Fixed pin standard GB/T2203-91.
The standard specifies a fixed pin with a specification larger than 3~50mm.
Third, the gap of the mold positioning pin
The matching clearance between the punch and the punch fixing plate of the stamping die is zero clearance or interference fit, and the matching clearance between the punch and the discharge plate is a dynamic fit, and the matching clearance is determined according to the punching clearance of the punch and the die, generally The matching clearance should be less than or equal to the punching clearance of the punch and the die; the punching clearance of the punch and the die is determined according to the thickness of the stamping material, and generally, if there is no special requirement, the punching gap can take 8% of the thickness of the blank. ~10%.
Fourth, the role of the mold positioning pin
1. Its function is an embodiment of the closed mold state inside the mold. The mold is already in place and can be obtained by measuring the data between the upper and lower limit columns.
2. The fixed pin limit column can also play the role of protecting the punch. When the upper and lower molds are separated, the length of the limit column is larger than the punch, which can prevent the punch from being broken.
3. When the mold is repaired, the mold can be placed sideways, which is convenient for disassembling the parts. The limit column plays the role of protecting the mold. For example, the stripping plate or the concave template on the mold has the pressing force and the pressing line to prevent the material from being unloaded. The empty surface damages the mold.
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