CNC Knowledge: Machine processing technology!

1. What are the three methods of part folder?

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2. What are process systems?

{Machine tool, work piece, fixture, tool}

3. The composition of the mechanical processing process?

{Rough processing, semi-precision processing, precision processing, super fine processing}

4. How to classify the reference?

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What are the processing precision including?

{1.

5. What are the original errors that appear during processing?

{Principles Error · Positioning error · Setting error · Knife error · Selection error • Machine tool rotation error · Machine oriental guide error · Machine transmission error -tool · Crack system warp errors caused by cause ·}

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6. The impact of process system rigidity on processing accuracy (machine tool deformation, workpiece deformation)?

{1. for processing precision}

7. What is the guide error and spindle rotation error of machine tools guide?

{1.

8. What is the phenomenon of “error reflection”? What is the error detection coefficient? What are the measures to reduce errors?

{Due to changes in the deformation of the process system error, the approximate error part is reflected in the workpiece measurements: increase the number of times the number of knives, increase the rigidity of the process system, reduce the amount of flow, increase the Accuracy vacuum}

9. Error analysis of machine tool transmission error? Measures to reduce the transmission error of the transmission chain?

{Error analysis: the angle error Δφ of the rotating error of the final component of the transmission chain is measured

Measurements: 1. The more the number of transmission chains, the shorter the transmission chain, the smaller the Δφ, the smaller the precision 2. The smaller the transmission, especially the early ends of the gear ratio, the error has the most error, so it should be as accurate as possible 4. Use a correction device}

10. How to classify the processing error? What errors are constant value error? What errors are the variable value system error? What errors are random errors

{System Error: (frequently system values ​​System Value Value System Error) Random errors

Frequency system error: processing error of processing principles, machine tools, tools and accessories, and the processing error caused by deformation of the process system

Value system error: wear of accessories;

Random error: copying the approximate error, positioning error, pitch error, multiple setting errors, deformation errors caused by residual stress}

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

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2. Error compensation technology: Online sensing puppets automatically control the error factor of the decisive role}

12. What is the geometric appearance of the processing surface?

{Geometric roughness, surface wave pattern, texture direction, surface defect}

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

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14. Try to analyze the factors that affect the roughness of the cutting processing surface?

{The rough value consists of the height of the cut residual area: the main factors of the cutting residual area: the radius of the tip of the main angle radion of the partial angle of the angle.

15. Try to analyze the factors that affect the roughness of the grinding processing surface?

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16. Try to analyze the cold factors that affect the surface of cutting treatment?

{The effect of the influence of the cutting of the knife cutting of the geometric shape of the processing material}

17. What is fire burn grinding? What is burn grinding and quenching? What is grinding and burn annealing?

{Fire: If the temperature of the grinding zone does not exceed the phase change temperature of quenching steel, but it has exceeded the transformation temperature of martensite. The coolant, the surface metal will appear off secondary the powerful fabric, which is higher than the original companion of the companion. The temperature of the phase change and if the grinding process is the coolant, the surface metal will appear cloth, and the hardness of the surface metal will be sharp sharp.

18. Prevention and control of mechanical processing vibrations

{Eliminate or weaken mechanical processing vibration-producing conditions; Improve the stability of the dynamic characteristics of the process system to improve the stability of the process system.

19. Briefly describe the main differences and application occasions of mechanical processing process map, process map and process map.

{Process Process map: Single-piece production machine processing technology map adopted by Ordinary processing methods: medium batch production map: large quantities of production types are strictly required, meticulous organizational work}

* 20. Principles of essence?

{Coarse benchmark: 1. Ensure the principles of mutual position requirements; Used repeatedly in rough bases: the reference principle; 2. The principle of unified reference;

21. What are the principles of the craft sequence?

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22. How to divide the processing step? What are the advantages of splitting the processing step?

{Processing stage Division: 1. Rough processing stage · Semi-precision processing stage · Precision processing stage · Precision light processing stage can ensure enough time to eliminate thermal deformation and eliminate stress residual generated by approximate processing, and improve the precision of subsequent processing. In addition, when the rough is found to be defective during the rough processing stage, there is no need to process the next processing stage to avoid waste. Moreover, you can use the reasonable equipment. Super precision processing, which ensures that the product quality of the guarantee pair is very important to improve the level of craftsmanship. }

23. What are the influencing factors of the process?

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24. What is the composition of working hours?

{T quota = t unique time + t

25. What are the ways to improve productivity?

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26. What are the main contents of the assembly process rules?

{1. Inspection method and inspection tools; 5. Determine the method of transporting assembly parts and the equipment and tools required.

27. What should be considered for the machine structure assembly process?

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28. How accurate is the general meeting?

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29. What are the problems of finding the assembly size chain?

{1. The chain must be pretended in different directions}

30. What are the ways to ensure assembly accuracy? What is the application of various methods?

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31. The composition and function of the machine tool fixture?

{Machine fixture is a device installed on the machine tool. The components are: 1. Positioning element or device.

Main functions 1. Guarantee processing quality 2. Improve production efficiency .3.

32. How to classify the scope of use of the luminaire?

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33. The room is located on a plane. And analyze the degree of freedom.

{The Coin Institute is located with a plane.

34. The part is located in a cylindrical hole. And analyze the degree of freedom.

{The part is positioned with cylindrical holes. The commonly used positioning element has 1 heart tree 2. Positioning sales}

35. The coin is located on the surface of the outer circle. And analyze the degree of freedom.

{The part is located on the surface of the outer circular surface. The commonly used positioning element has V-shaped blocks}

36. The part is positioned with single-factor sales.

{1.

37. What are the two aspects of positioning error? What are the ways to calculate positioning error?

{Positioning error of two aspects. of the part process does not overlap.

38. Basic requirements for the design of the backrest device.

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3. The clamping device should be easy to use, effort-saving and safe. 4. The complexity and degree of automation of the clamping device must be compatible with the production batch and production method. The structural design should be simple, compact and try to use standardized elements}

39. Three elements determined by clamping force? What are the principles of direction and tightening action points?

{The choice of the direction of the point of the point of the direction of the direction should generally follow the following principles: 1. The direction of action of the clamping force should be conducive to the precise positioning of the workpiece rather than destroying the positioning. The cutting force and gravity of the workpiece to reduce the need to tighten the workpiece clamp.

1. The force clamping point should be within the support surface formed by the support members to ensure that the positioning of the workpiece is unchanged

2. The point of clamping force should be in a part with better rigidity to reduce the tightness and deformation of the part 3. The point of clamping force should be as close as possible to reduce the torque caused by the cutting force at the workpiece}}

40. What are the commonly used clamping mechanisms? Focus on analyzing the oblique clamping mechanism of the corner.

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41. How to classify the characteristics of drilling pattern? How to classify the structural characteristics of drilling cover? What are the specific connections of drill pattern and clip?

{Drilling model according to the characteristics of the co-structure:

1.

2. 1. Fixed drilling mold 2. Cable for changing drilling mold 3. Quick drilling drilling pattern 4 Special drilling drilling pattern on the specific connection method of the clamping:

3. Fixed hinge type partition suspension}