Manhart How to evaluate the machining accuracy of CNC downward bending machines?

When evaluating the machining accuracy of CNC downward bending machines, detailed considerations can be made from the following key points. The following evaluation methods are compiled based on reference articles:
1. * * Wire feeding accuracy * *:
-Measure the length of the wire delivery and compare it with the set value. Usually, CNC bending machines require a wire feeding accuracy within the range of 300 ± 0.2mm, that is, the deviation between the wire feeding length and the set value should not exceed 0.2mm.
2. * * Bending angle accuracy * *:
-Use angle measuring tools (such as angle rulers or high-precision measuring instruments) to measure the bending angle of the bent part.
-Evaluate the deviation between the bending angle and the set value. CNC bending machines usually require the bending angle deviation to be within ± 0.3 degrees.
3. * * Straightness and flatness * *:
-Use straightness and flatness measurement tools (such as straightness or flatness gauges) to check the straightness and flatness of the bent part.
-According to the national standard GB/T14349-2011 “Bending Machine Precision” or other relevant standards, compare the measurement results to evaluate whether the straightness and flatness of the bending machine are qualified.
4. * * Workbench and Mold Precision * *:
-Check the horizontal and vertical flatness of the workbench to ensure that it meets the requirements of the equipment manual or national standards.
-Check the accuracy of the mold, including its size, shape, and fit clearance, to ensure that the mold can meet the requirements of machining accuracy.
5. * * Processing accuracy stability * *:
-Conduct multiple processing experiments and measure the accuracy data of each processing.
-Analyze the stability and consistency of machining accuracy data, and evaluate whether the machining accuracy of the CNC moving bending machine is stable and reliable.
6. * * Geometric accuracy detection * *:
-If the working accuracy of the equipment decreases after long-term use, it may be necessary to check the geometric accuracy of the machine tool. This usually includes the flatness of the machine tool worktable, the parallelism between the horizontal support surface of the upper mold fitting surface and the machine plane, etc.
-Due to the need for professional knowledge and skills in geometric accuracy testing, it is generally carried out by professional maintenance agencies.
7. * * Operation and Programming Impact * *:
-Evaluate the skill level and programming ability of operators to ensure that they can correctly set machining parameters and write machining programs.
-Check the accuracy and rationality of the machining program to avoid a decrease in machining accuracy caused by programming errors.
8. * * Equipment Maintenance and upkeep * *:
-Regularly maintain and upkeep the equipment to ensure that it is in good working condition.
-Pay special attention to the impact of maintenance work such as lubrication, tightening, and cleaning on machining accuracy.
In summary, evaluating the machining accuracy of CNC downward bending machines requires comprehensive consideration of multiple aspects such as wire feeding accuracy, bending angle accuracy, straightness and flatness, workbench and mold accuracy, machining accuracy stability, geometric accuracy detection, operation and programming effects, and equipment maintenance and upkeep. By conducting a detailed evaluation and analysis of these key points, we can comprehensively understand the machining accuracy of CNC downward bending machines, providing strong support for production.