Manhart How to evaluate the machining accuracy of CNC punching and shearing machines?

When evaluating the machining accuracy of a CNC punching and shearing machine, the following key aspects can be referred to and represented and summarized in a clear format:
1、 Processing accuracy index
1. * * Positioning accuracy * *:
-Positioning accuracy refers to the precision that a punching and shearing machine can achieve during positioning, generally expressed in terms of position error.
-According to national standards and practical application requirements, it is usually required that the positioning accuracy reach 0.15mm or lower (such as 0.10mm, 0.05mm).
2. * * Repetitive positioning accuracy * *:
-Repetitive positioning accuracy refers to the stability of the accuracy that the punching and shearing machine can achieve in multiple repeated positioning.
-Usually, the standard for this accuracy is half of the positioning accuracy, that is, if the positioning accuracy is 0.15mm, the repeated positioning accuracy should be 0.075mm or lower.
3. * * Processing accuracy * *:
-Machining accuracy refers to the precision that a punching and shearing machine can achieve during the machining process, usually expressed in terms of machining error.
-According to national standards, the processing accuracy of punching and shearing machines should reach 0.30mm or 0.20mm. However, in practical applications, in order to meet the manufacturing needs of high-quality products, it is required that the machining accuracy reach below 0.10mm.
2、 Testing method
1. * * Use measuring tools * *:
-Use measuring tools such as micrometers, gauges, and block gauges to test the dimensional accuracy of parts machined by machine tools.
-For shape accuracy and surface roughness, instruments such as optical microscopes and electron microscopes can be used for detection.
2. * * Actual Processing Testing * *:
-Process the same part multiple times and detect changes in its size and shape errors.
-Through this method, the repetitive positioning accuracy and machining stability of CNC punching and shearing machines can be evaluated more directly.
3、 Other considerations
1. * * Machine tool structure * *:
-Evaluate whether the rigidity, stability, and structural design of the machine tool are conducive to maintaining machining accuracy.
2. * * Control System * *:
-Evaluate the impact of the precision, response speed, and anti-interference ability of the control system on machining accuracy.
3. * * Work Environment * *:
-Consider the impact of work environment on machine tool accuracy, such as temperature, humidity, vibration, and other factors.
4、 Induction
Evaluating the machining accuracy of CNC punching and shearing machines is a comprehensive process that requires consideration of multiple indicators and factors. Evaluating the positioning accuracy, repeat positioning accuracy, and machining accuracy of machine tools through measuring tools and actual machining tests is a key step. Meanwhile, the structure, control system, and working environment of the machine tool can also have an impact on machining accuracy. Based on a comprehensive consideration of these factors, choose a CNC punching and shearing machine that suits your needs, and regularly maintain and upkeep it to ensure the machining accuracy and stability of the machine tool.