takeaway
What are the processes of machining?
RuiSiCheng brings you the complete set of machining technology!
1. What are the three methods of workpiece clamping?
1. Clamping in the fixture;2. Directly look for the jacket;3. Underline to find the fitting clip
2. What does the process system include?
Machine tools, workpieces, fixtures, cutting tools
3. What are the components of the machining process?
Roughing, semi-finishing, finishing, superfinishing
4. How is the benchmark classified?
1. Design benchmark 2. Process datum: process, measurement, assembly, positioning: (original, additional) : (rough datum, fine datum)
5. What does machining accuracy include?
1. Dimensional accuracy 2. Shape accuracy 3. Position accuracy
6. What are the original errors during processing?
Principle error · positioning error · adjustment error · tool error · fixture error · machine tool spindle rotary error · machine guide error · machine tool drive error · process system stress deformation · process system thermal deformation · tool wear · measurement error · error caused by residual stress of workpiece.
7. Influence of process system stiffness on machining accuracy (machine deformation, workpiece deformation)?
1. Workpiece shape error caused by changes in the position of the cutting force operating point 2. Machining error caused by changes in the size of the cutting force 3. Machining errors caused by clamping force and gravity 4. Influence of transmission force and inertial force on machining accuracy
8. What are the guiding error and spindle rotation error of machine guide rail?
The guide mainly includes the relative displacement error of the tool and workpiece in the error sensitive direction caused by the guide 2. Radial run-out of spindle · axial run-out · inclination swing
9. What is the phenomenon of "duplicate error"?What is the error complex coefficient?What are the measures to reduce the error remapping?
As the deformation of process system error changes, the blank error is reflected on the workpiece
Measures: increase cutting times, increase process system stiffness, reduce feed, improve blank accuracy
10, machine drive chain drive error analysis?The measure that reduces drive chain drive error?
Error analysis: it is using element at the end of the transmission chain Δ phi Angle error measure
Measures: (1). The less quantity of transmission chain and transmission chain is short, the smaller Δ phi, the precision is higher (2) the smaller the transmission ratio I, especially at the end of the first small on both ends of the transmission ratio, (3) because of the influence of transmission error of the end in a maximum, so should make it as accurate as possible. (4). Using the calibration device.
To be continued!