Ly thuyet nghe chuyen ngành 51-70

When we perform the clamping process well,

• Reduce labor

• Reduce processing time

• Improve accuracy and gloss of details

• All three sentences above are correct

Causes of machining errors:

• Elastic deformation of the technological system

• Accuracy of machines, tools, jigs

• Thermal deformation of the technological system

• All three sentences above are correct

What is the cause of residual stress in the surface of machined parts?

• Due to the force field that appears during the cutting process and causes plastic deformation

• The metal undergoes a phase change and generates heat in the cutting zone

• Heat is generated in the shear zone and changes the elastic modules

• All three sentences above are correct

Suitable jigs for mass production are:

• Specialized jigs

• Universal jig

• Combination jig

• Both a and c are correct

Which of the following criteria is used to evaluate machining accuracy:

• Systematic error

• Wave level

• Physical and mechanical properties of the surface layer

• All three sentences above are correct

The geometric properties of machine parts' surfaces are evaluated through the following criteria:

• Subtle undulation

• Surface wear

• Surface waviness

• Both a and c are correct

When machining shafts with 5 ≤ L/D ≤ 10 ,we use:

• Two arrows against the center

• 1 chuck and 1 center bit

• 3-jaw chuck

• Both a and b are correct

When turning, the cutting force component that strengthens the tool body is:

• PZ

• PY

• PX

• All are wrong

Which of the following criteria is used to evaluate machining accuracy?

• Dimensional accuracy

• Geometric shape accuracy

• Correlated position accuracy

• All are correct

Which components belong to the technological process:

• jig operation.

• Steps, tool paths.

• Movements and positions.

• All three sentences above are correct.