Analysis and Improvement Measures of Cutting Delayed Crack of Thick NM500 Steel Plate

The cutting delay crack of thick NM500 steel plate is a common quality defect in steel structure manufacturing. This not only affects the overall performance of the product quality, but also is the cause of many safety accidents during use. Therefore, it is very important to analyze and improve the cutting delayed cracks of thick NM500 steel plate in the production process.
    
I. Causes of Cutting Delayed Crack of Thick NM500 Steel Plate
    
1. Low cutting speed
NM500 steel plate has higher strength, so there is larger cutting force when cutting, if the cutting speed is too low, the cutting temperature will be too high, and it will cause cutting delayed cracks.
    
2. Inappropriate use of cutting fluid
When cutting thick N.M500 steel plate, it is necessary to add appropriate cutting fluid, otherwise it will cause poor chip evacuation and local high temperature melting.
    
3. Inappropriate cutting tool material
The cutting tools used to cut N.M500 steel plate must meet the requirements, otherwise it will increase the cutting force, generate sparks and heat during cutting, and cause cutting delayed cracks.
    
4. Unstable cutting process parameters
During the cutting process of thick N.M500 steel plate, if the cutting parameter is inconsistent, it will unscrupulously increase the cutting force and temperature during cutting.
    
5. Poor tool geometry
In the process of cutting thick N.M500 steel plate, if the tool geometry is not good, such as sharp corner, blunt edge, small radius and large rake angle, it will also easily cause cracking.
    
II. Improvement Measures of Cutting Delayed Crack of Thick N.M500 Steel Plate
    
1. Adapt cutting speed properly
The use of appropriate cutting speed can ensure that the cutting temperature is within a reasonable range and reduce the cutting delay crack of thick N.M500 steel plate.
    
2. Add enough cutting fluid
During the cutting process of thick N.M500 steel plate, the addition of cutting fluid can cool the cutting place and evacuate the chips, reduce friction and reduce cutting temperature, thus effectively avoid the occurrence of cutting delay crack.
    
3. Choose cutting tools reasonably
When cutting thick N.M500 steel plate, the cutting tools must meet the requirements and match the quality of the steel plate.
    
4. Stabilize the cutting process parameters
In the process of cutting thick N.M500 steel plate, the cutting parameters must be stabilized in order to keep the cutting quality and reduce the occurrence of cutting delayed crack.
    
5. Pay attention to tool geometry
Tool geometry design is an important factor for the cutting quality of thick N.M500 steel plate. It is necessary to pay attention to the appropriate design of cutting edge radius and rake angle, etc.
    
III. Conclusion
 The cutting delay crack of thick N.M500 steel plate is a common quality defect, which has a great influence on the product quality and safety performance. Through the above analysis and improvement measures, it is thus possible to effectively reduce the cutting delayed crack of thick N.M500 steel plate in the production process, improve the quality of steel structure, and ensure the safety performance during use.

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