Care should be taken when sharpening such cemented carbide inserts by placing the carbide insert in the shank groove and securing it with the bolts and the pad of the scum. The length of the blade from the inside of the holder should not exceed 1 to 1.5 mm. The pad should be placed in front of the blade, and the chip should be spirally wound out when placed. The distance or amount of protrusion measured from the middle of the blade depends on the size of the chip profile. The size of the amount of protrusion should not be less than the value listed in Table 1, otherwise the chip will hit the chipper violently, which will cause the cutting part of the turning tool to break and even break the tool bar. When cutting, replace the blunt or broken blade in time. The blade must be cleaned from the shank by replacing the blade.
The advantage of this type of cutter structure is that when there is an error between the cutter block and the cutter body, the grinding can be performed to ensure the assembly precision; the compression bolt is located on the flank face and is not easily damaged by the chip. The plate holder is more suitable for heavy-duty cutting because it greatly increases the rigidity of the blade in the direction of force. After increasing the amount of cutting, it does not cause large vibration, which is beneficial to the improvement of production efficiency and processing quality.
4 Selection of cutting amount
The cutting depth of the heavy-duty turning roughing stage can reach 50mm on one side, the corresponding cutting speed is about 10m/min, and the feed rate is 1.5mm/r. Since the roughing stage is to remove the allowance as the main processing purpose, in accordance with the principle of determining the cutting allowance in machining, in order to improve the cutting efficiency, the cutting depth should be increased. Due to the large cutting depth during heavy cutting, the cutting force is large, and the corresponding cutting speed is generally selected to be 10 to 15 m/min, and the feed amount is 1 to 2 mm/r. With such a cutting amount, the surface roughness of the workpiece is relatively poor, and only Ra12.5 to Ra6.3 can be achieved, and the roughness value can be increased by the rolling method to meet the requirements of the subsequent processing.
5 Conclusion
Compared with ordinary turning, heavy-duty turning differs greatly from theoretical calculations. At present, many processes and tool materials for heavy-duty turning are based on ordinary machining. This is not entirely applicable, so it needs to be further explored.
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