Going to a mobile phone stamping die factory to learn the precision mold technology, what makes me feel the deepest is not its superb mold design level and precise processing technology, but its sophisticated mold development concept.


Just the next day, the team leader told us to instill a precise mold concept for us. What is a sophisticated mold concept? I don't think so. I am doing thin products here. I have done some before. How can there be no precise concept?




As the learning progressed, I began to realize my superficiality!


The first stop for our trip is high-speed module. In terms of the precision of the mold, the high-speed terminal mold should be considered the most sophisticated here. The stamping material is generally 0.08~0.2 mm stainless steel and aluminum. The punching clearance is as small as 0.008 mm, and the minimum width of the punching hole is 0.25 mm. The punch looks like a weak wind. How to make such a small hole? How does such a small punching clearance ensure the precision of the mold manufacturing? It is hard to imagine if you don’t see it with your own eyes.


Turning on the drawing, understanding the mold structure, designing manufacturing tolerances and its special manufacturing process, we can easily touch the pulse of this set of molds.


All the punching parts are into the block and punch from top to bottom, and the knife edge is made of tungsten steel. Upper template, stripper plate, lower template insert hole, fixed pin hole JG grinding, sliding fit clearance c+0.005~0.010 mm, non-slip fit c+0.003 mm, machining accuracy +/-0.002 mm; main structure guide For the ball sleeve with the precision guide column, the punching small hole structure adopts the partial structure separated from the upper mold, and the contour clamp is used on the lower template to compensate the precision error of the punching equipment; the guide member of the local structure is the precision graphite self-lubricating inner guide The inner sleeve of the column, the stripping plate and the lower template is filled with glue to make up for the machining error of the guiding part and improve the guiding precision to ensure the positional accuracy of the template in the stamping process; the punching stroke as small as possible can make the punching punch The length is as short as possible, and proper punch reinforcement can improve the strength of the punch. This can fully reflect the design concept of the mold designer tends to high precision, as much as possible to ensure the high quality and high requirements of the mold.


Modern processing equipment and high-precision processing technology make these design concepts accessible. After the template is heat treated, it is subjected to cryogenic aging treatment to eliminate internal stress, prevent template deformation, and ensure the processing stability of the template. The plane grinding ensures the flatness of the template and the parallelism is 0.005 mm.


The level of sophistication of the mold assembly engineers is even more admirable. First carefully understand the mold surface, familiar with the product information, analyze the mold structure, understand the design intent; check the parts, chamfering, polishing, lettering and meticulous signs; template deburring, oiling and anti-rust step by step, loading the outer guide column, guide sleeve to Use special positioning tools to ensure the verticality; the measured thickness of the template, the four-point measurement is within 0.005 mm; the punch and the block are matched, the fit should be smooth, the grinding degree is good, the judgment standard is clear; the test mode, When adjusting the mold, the self-test of the product should use the projector, and the accuracy of the mold can be adjusted to 0.003mm. Without the concept of precision, it is impossible to develop high quality, and it is impossible to install high-precision molds.


Mold development is mainly divided into three stages: mold design; mold processing; mold assembly, test and repair. The three are indispensable. A set of high-precision molds must have precise design, precise machining, and precise assembly.