Knowing the mold structure, designing manufacturing tolerances

Update:28-08-2018
Summary:

Knowing the mold structure, designing manufacturing tol […]

Knowing the mold structure, designing manufacturing tolerances and its special manufacturing process, it is not difficult to touch the pulse of this mold.

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 precise die mould 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 compensate 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 tending 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.

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.

The fineness of the mold assembly engineer must 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 rust-proof step by step, For the outer guide column and guide bushing, a special positioning tool should be used to ensure the verticality; the thickness of the template is measured, and the four-point measurement is within 0.005 mm; the punch and the block are matched, the fit is smooth, and the fit is smooth. The judgment standard is clear; the self-test of the product during trial and adjustment is to use the projector, and the accuracy is up to 0.003mm when the mold is inserted into the block; without the concept of precision, it is impossible to develop high quality, and it is impossible to install high precision. The mold.