Limiting the working loads of your presses to 80-percent of the maximum rated capacity is a common practice with many companies to ensure long machine life. But press selection often is determined by process engineering or tool engineering prior to tool construction. At this early phase of die development actual pressing forces only can be estimated. Only after the die is built and set in the press for the first time can the actual stamping loads be determined using press tonnage monitors. If actual tonnage exceeds the planned loading (tonnage), the die setter and engineer should consult to determine if the loading conditions are acceptable for the assigned machine. Often overlooked is the fact that an even distribution of the work load across the slide face (ram) is equally important. Ignoring load distribution can lead to die damage and eventually press damage, even when stamping loads remain well below the maximum rating of the press.
展开▼
