From the analysis of a set of reference testing data provided by the press brake tool manufacturer, the impact of the longitudinal error of the press brake table on the bending accuracy is about three times that of the transverse error. The impact value of the bending angle deviation is about 3 times the flatness error of the workbench.
The bending angle deviation has little effect on the verticality of the working surface due to the slider stroke and can be ignored. The straightness of the work surface will directly reflect the straightness deviation of the work piece, and the two are almost equal. The bending straightness deviation is less affected by the slider stroke and the verticality error of the working surface. The work table mentioned in this article includes two, one is the machine table, and the other is the geometric accuracy of the horizontal support surface of the upper mold fitting surface. for example:
The length of the working table of a certain press brake is 3200mm. After measuring the working accuracy of this press brake, the following data were obtained: the straightness deviation of the workpiece is 0.06mm, and the bending angle deviation is 0.1720. It can be inferred from this that the flatness of the work surface of this press brake is about 0.06mm.
According to the national standard GB/T14349-2011 “Precision of press brakes”, the flatness margin of a press brake with a table length of 3200mm is 0.08mm. From this, it can be determined that the flatness accuracy of the press brake is qualified. In fact, as a user of a press brake tool, you only need to pay attention to the working accuracy of the machine tool.
Because the working accuracy of machine tools after long-term use is not only affected by the factors mentioned in this article, the transmission clearance and mechanical wear of the machine tool that affect the accuracy of the work piece must also be taken into consideration, and the machine tool should be evaluated and considered comprehensively. That is to say, through the inspection of the working accuracy of the machine tool’s bending parts, combined with the national standards for the accuracy of the press brake, the comprehensive precision processing capabilities of a press brake can be inspected and judged.