There are various CNC machining methods. Depending on processing requirements and materials, the machining processes differ. Dongguan Changyuanfeng

Precision, with over 20 years of experience in the CNC machining industry, has accumulated rich practical experience through actual operations. Below are some of the machining methods we have summarized:

1. What are the three methods of workpiece clamping?

1. Clamping in a fixture; 2. Direct alignment clamping; 3. Scribing alignment clamping

2. What components does the technological system include?

Machine tool, workpiece, fixture, cutting tool

3. What are the components of the mechanical machining process?

Rough machining, semi-precision machining, precision machining, super-precision machining

4. How are benchmarks classified?

1. Design benchmarks (Designbenchmarks);

2. Process benchmarks: Process, Measurement, Assembly, Positioning: (Original, Additional): (Rough benchmarks, Precision benchmarks)

What does machining accuracy include?

1. Dimensional accuracy; 2. Form accuracy; 3. Positional accuracy

5. What original errors occur during the machining process?

Principle error; Positioning error; Adjustment error; Tool error; Fixture error; Machine tool spindle rotational error; Machine tool guide rail guidance error; Machine tool transmission error; Deformation of the process system under force; Deformation of the process system due to heat; Tool wear; Measurement error; Error caused by workpiece residual stress

6. What is the impact of process system stiffness on machining accuracy (machine tool deformation, workpiece deformation)?

1. Workpiece shape error caused by changes in the position of the cutting force application point

2. Machining error caused by changes in cutting force magnitude

3. Machining error caused by clamping force and gravity

4. Impact of transmission force and inertial force on machining accuracy

7. What do the guiding errors of machine tool ways and spindle rotational errors include?

1. Ways: Primarily relative displacement errors between the tool and workpiece in the error-sensitive direction caused by the ways

2. Spindle: Radial circular runout, axial circular runout, angular oscillation

8. What is the 'error reflection' phenomenon? What is the error reflection coefficient? What measures can be taken to reduce error reflection?

Error reflection occurs when part of the blank error is reflected onto the workpiece due to changes in deformation caused by errors in the process system. Measures: Increase the number of passes, increase the rigidity of the process system, reduce the feed rate, and improve the blank accuracy.

9. Analysis of transmission chain transmission errors in machine tools? What measures can be taken to reduce transmission chain transmission errors?

Error analysis: It is measured by the angular error Δφ of the end element of the transmission chain.

Measures: 1. The fewer the number of transmission chain components and the shorter the transmission chain, the smaller Δφ and the higher the precision. 2. The smaller the transmission ratio i, especially at the beginning and end of the transmission. 3. Since the error of the end component in the transmission has the greatest influence, it should be made as precise as possible. 4. Use correction devices.

10. How are machining errors classified? Which errors belong to constant systematic errors? Which belong to variable systematic errors? Which belong to random errors?

Systematic errors: (Constant systematic errors, Variable systematic errors) Random errors

Constant systematic errors: Machining principle errors, manufacturing errors of machine tools, cutting tools, and fixtures, machining errors caused by deformation of the process system under force, etc.

Variable systematic errors: Tool wear; thermal deformation errors of tools, fixtures, machine tools, etc., before thermal equilibrium.

Random errors: Reflection of blank errors, positioning errors, clamping errors, errors from multiple adjustments, and deformation errors caused by residual stresses.

11. What are the ways to ensure and improve machining accuracy?

1. Error Prevention Technology: Reasonably adopting advanced processes and equipment, directly reducing original errors, transferring original errors, averaging original errors, homogenizing original errors

2. Error Compensation Technology: Online detection, automatic matching and grinding of mating parts, actively controlling the decisive error factors

12. What does the geometric morphology of the machined surface include?

Geometric roughness, surface waviness, texture direction, surface defects

13. What physical and chemical properties of the surface layer material are included?

1. Cold work hardening of the surface layer metal

2. Metallographic structure deformation of the surface layer metal

3. Residual stress in the surface layer metal

14. Analyze the factors affecting the surface roughness of cutting machining?

The roughness value is determined by: the height of the cutting residual area. According to Ympcnc Precision (ympcnc.net), the main factors are: nose radius of the tool, principal cutting edge angle, secondary cutting edge angle, and feed rate. The secondary factors are: increasing cutting speed, appropriately selecting cutting fluid, appropriately increasing the rake angle of the tool, and improving the grinding quality of the tool.

15. Analyze the factors affecting the surface roughness of grinding machining?

1. Geometric factors: the effect of grinding parameters on surface roughness

2. The effect of grinding wheel grit and grinding wheel dressing on surface roughness

2. Influence of physical factors: Plastic deformation of the surface layer metal: Grinding parameters, selection of grinding wheel