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Maintenance experience high-speed metal stamping dies
On the computer connector, terminal (stampings) become more and more small, complex and precision, and the terminal of the mold stamping production, how to overcome it over twisted deformed, guarantee its size and functional requirements, it must be take effective policy.
1. stamping produce stacker, the distortion occurs because the progressive die, stamping periphery by punching way more than expected, to form the shape of pieces. Produce stacker, twisted mainly due to the impact of stamping blanking force. When punching, blanking clearance due to the presence of material on one side of the die is stretched (Material warped upward), compressed by the punch side. When using the stripper plate when the stripper plate pressed material use to prevent warping material die side up, at this time, the situation by force material change accordingly. With the stripper plate to increase its binder force, by material punch side of that tension (compression force tends to decrease), while the die surface material is compressed (tensile strength tends to decrease). Flip stamping die, that is due to the material surface caused by stretching. So when punching, pressed and compacted material is produced prevent pieces stacker, distorted priorities.
2. inhibition stampings produced stacker, twisted way
(1) Reasonable design mold. In the progressive mold, arrange the order of cutting may affect the accuracy of stamping forming. For cutting stamping small parts, the general arrangements for punching a larger area of the first cutting, then arrange a small area of punching cutting, punching power to mitigate the impact on stamping forming.
(2) Squeeze the material. Overcome overcome the traditional mold design structure, the board takes the contents of the material discharge gap (ie, the mold is closed, the stripper plate and die bonding, and packaging material at the gap of traditional stripper plate and die for the material thickness t-0.03 ~ 0.05mm). So, stamping stripper plate smooth motion, and the material is pressed in turn. Forming key parts, stripper plate insert structure must be made to facilitate the solving time stamping pressure caused by the stripper plate mill to produce feed area (pressure) loss, and can not compress the material.
(3) Forced additional function. Namely discharge nip portion thicker insert size (normal discharge insert thick H + 0.03mm), to increase the pressure on the die side material, thereby inhibiting stampings produced when punching stacker, distortion.
(4) the ends of the punch blade repair a slant or curved. This is an effective way to slow the punching force. Mitigation punching power, it can reduce the die side of the tensile force, and thus inhibit stampings produced stacker, distorted results.
(5) daily mold production, should pay attention to maintenance punching convex, die cutting edge sharpness. When the punching edge wear, tensile stress suffered material will increase, thereby stamping produce stacker, distortions tend to increase.
(6). Blanking clearance unreasonable or uneven gaps also produce stampings stacker, twisted reason, need to be overcome.
3. Production of common specific problems in daily production, punching encounter with bigger or smaller (possibly out of specification requirements) and the size difference between the larger and punch the case, in addition to considering forming convex and concave mold outside the design size, precision and punching gap and other factors should also be considered to address the following aspects.
(1) When punching edge wear, tensile stress suffered material increases, stamping produce stacker, distortions tend to increase. When generating stacker, punching size tends to become smaller.
(2) For Forced materials, plastic deformation of the material will lead to increasingly large punching size. While alleviate extreme pressure, punching size tends to become smaller.
(3) the ends of the punch blade shape. An end repair a slant or curved, due to the punching power to slow, difficult to produce pieces stacker, twisted, therefore, punching size tends to become large. The punch ends when the plane (no ramps or curved), for punching relative size tends to become smaller.
In the specific production practice, it should be a concrete analysis of specific issues, and to find solutions to problems. Above introduces punching, stamping produce stacker, twisted reasons and Solutions.