Complete Collection of Precision Hardware Processing Techniques

1. What are the three methods for processing precision hardware parts?

Clamping fixture; Directly find the correct clamping method; Mark out the correct clamping method

2. What does the process system include?

Machine tools, workpieces, fixtures, tools

3. What are the components of the processing process?

Rough machining, semi precision machining, precision machining, ultra precision machining

4. How to classify benchmarks?

Design benchmark processing benchmark: processing, measurement, assembly, positioning: (original, additional): (rough, fine) What does the precision of precision hardware parts processing include? Dimensional accuracy, shape accuracy, and positional accuracy.

5. What are the original errors in the processing of precision hardware parts?

Principle error, positioning error, adjustment error, tool error, fixture error, machine tool spindle rotation error, machine tool guidance error, machine tool transmission error, process system force deformation, process system thermal deformation, tool wear, measurement error, and errors on residual stress workpieces.

6. How does the stiffness of the process system affect machining accuracy (machine deformation, workpiece deformation)?

The shape error of the workpiece caused by changes in the position of the cutting force application point, the machining error caused by changes in cutting force, the machining error caused by clamping force and gravity, as well as the machining accuracy caused by the influence of transmitted force and inertial force.

7. What are the guiding errors and spindle rotation errors of machine tool guides?

The guide rail mainly includes the relative displacement error of the tool and workpiece in the error sensitive direction caused by the guide rail. Radial circular runout, axial circular runout, and inclined oscillation of the spindle.

8. What is the phenomenon of 'error replay'? What is the error reconstruction coefficient?

What measures can be taken to reduce errors in re screening? Due to changes in process system errors and deformations, some blank errors will be reflected on the workpiece. Measures: Increase the number of passes, increase the rigidity of the processing system, reduce the feed speed, and improve the accuracy of the blank.

9. Analysis of transmission error of machine tool transmission chain? Measures to reduce transmission errors in the transmission chain? Error analysis: It is based on the angle error of the end components of the transmission chain Δφ Measured. Measure: The fewer the number of transmission chains, the shorter the transmission chain, Δφ The smaller the size, the higher the accuracy. The smaller the transmission ratio i, especially at the head and end, the lower the transmission ratio because the error of the end piece in the transmission component has a greater impact on Z, so it should be as accurate as possible. Use a calibration device.

10. How to classify processing errors? Which errors are persistent?

Which errors are variable system errors? Which errors are random? System error: (constant system error, variable value system error) random error. Constant system error: machining principle error, manufacturing error of machine tools, tools, fixtures, process system stress deformation, etc. Processing error. Variable value system error: tool wear; Tools, fixtures, machine tools, etc. undergo thermal deformation errors before thermal balance. Random errors include blank errors, positioning errors, tightening errors, multiple adjustment errors, and deformation errors caused by residual stress.