What happened to stainless steel 304, two knives are broken!

1. The blade inclination angle of the tool must be 0°, and it can be ground on a tool grinder if possible. This is the most important point. Because the friction between the chips and the groove wall is severe when the stainless steel is cut, if the chips cannot be rolled out vertically, the phenomenon of chip squeezing will occur, and the knife will be hit in severe cases. When the blade inclination angle is large, the effect of chip splitting measures is not ideal.

2. The radius of the tool tip arc should not be too large. If it is too large, the auxiliary clearance angle of the tool is easy to wear. It may be because the chip thickness at the arc is reduced, which is easy to produce work hardening and aggravate the wear of the tool side.

3. Tool wear should be sharpened in time. The sharpening standard of stainless steel cutting knife should not only be determined according to the main back, but also pay special attention to the degree of wear on the auxiliary back. If the auxiliary back is worn too much, the friction between the tool and the groove side will increase. , Resulting in narrowing of the groove width, making it difficult to discharge chips, and accelerating tool wear.

4. The front surface roughness of the tool should be reduced as much as possible, and the surface roughness value is low, which can reduce the bonding wear, reduce the cutting force, and cut lightly. Practice has proved that the tool life after the front of the tool is polished is significantly longer than that of the unground tool.

5. The cutting edge is ground with a negative chamfer of about 0.2mm, which can reduce edge chipping during grinding and obtain better cutting edge quality. The lower part of the knife body adopts a fish belly shape to increase rigidity. The clearance angle of the tool pair is externally ground with a grinding wheel, and the rigidity is better. The actual clearance angle is about 2°～3°.

The tool material for processing stainless steel is generally selected from YG alloy which is not easy to bond and wear with it. I chose YG8 with better strength. The tool width is selected according to the diameter of the bar, and the cutting speed is about 60m/min.

This tool can meet the needs of general machining. The bar material of φ40～φ80MM can be cut at one time without driving the knife around. Pay attention to the sharpness of stainless steel chips during processing. If the chips are too long, the knife must be retracted to break the chips. To avoid danger, the tool should not stay on the surface of the workpiece when retracting, to reduce work hardening. When cutting a solid workpiece, in order to prevent the tool from breaking, you can leave about 1~2mm to cut it by hand when cutting to the center.

6. For this kind of stainless steel cutting, under normal circumstances, wet cutting is several times longer than dry cutting tool life. I mainly look at the speed and cutter. The speed will be high without adding water, and the chips from the cutter will be red immediately. After processing a few things, it will be clear!

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