All punching parts from top to bottom are into the block, punch, blade for tungsten steel material. JG grinding of the block holes and fixed pin holes of the upper template, stripping plate and lower template, with sliding fit clearance c 0.005~0.010mm, non-sliding fit c 0.003mm, machining accuracy/-0.002mm; The main structure guide is a ball sleeve with precision guide column. The punching hole structure adopts a local structure separated from the upper die, and is locked on the lower template with a contour sleeve to make up for the accuracy error of the stamping equipment; the guide part of the local structure is a precision graphite self-lubricating inner guide post, and the stripping plate and the inner guide sleeve of the lower template are filled with glue to make up for the processing error of the guide part and improve the guiding accuracy to ensure the position accuracy of the template during the stamping process. The smallest possible punching stroke can make the length of the punching punch as short as possible, and proper punch reinforcement can improve the strength of the punch. This can fully reflect the mold designers tend to high-precision design concept, as far as possible to ensure the high quality of the mold, high requirements.
Modern processing equipment, high-precision processing technology, but also makes these design concepts are allowed to play. After heat treatment, the template undergoes cryogenic aging treatment to eliminate internal stress, prevent deformation of the template, and ensure the processing stability of the template. Plane grinding ensures the flatness of the template, the parallelism is 0.005mm, the EDM machining accuracy is controlled at ± 0.002mm, and the cut-wire machining accuracy is controlled at ± 0.0015mm.
For high-precision processing, the temperature problem must not be ignored, because the temperature difference is the enemy of precision. Because of the thermal expansion and contraction of the material, the linear expansion of the steel will produce a change of 12 μm per meter when the temperature changes by 1°C. This is the same fact in every corner of the world, every machine. If we don't care about the important topic of temperature, how can we discuss accuracy? The control of the temperature in the workshop is very important, because the accuracy of the processed workpiece has a lot to do with it. The temperature of precision machining is generally controlled at a constant 20°C, and the temperature fluctuation is required to be less than 0.5°C/hour, and the air conditioning system maintains a constant ± 1°C temperature difference throughout the day.
I admire the fineness of the mold group engineer. First carefully understand the mold drawing, be familiar with the product information, analyze the mold structure, and understand the design intent; Check the parts, chamfer, polish, lettering and mark meticulously. Deburring the template, oiling and anti-rust step by step, and special positioning tools shall be used for installing outer guide posts and guide sleeves to ensure their verticality. The measured thickness of the template is qualified when measured at four points, with a difference of 0.005mm, the judgment standard is clear; Projector shall be used for self-inspection of products during mold test and mold adjustment, and the precision shall be 0.003mm when mold repair is inserted into the block. Without the concept of precision, it is impossible to develop high-quality and install high-precision molds.
Mold development is mainly divided into three stages: mold design; Mold processing; Mold group erection, trial and repair good. All three are indispensable. A set of high-precision molds should have precise design, precise processing and precise assembly.