Influence of blade reassembly and replacement on cutting gray cast iron

The influence of reassembly of the same blade at different cutting depths on the cutting force is shown in the table. As can be seen from the table, generally speaking, in the process of cutting depth changing from small to large, the impact of blade reassembly on cutting force changes from large to small, and the overall change range is small. When evaluating the cutting force, the cutting force in Z direction (i.e. main cutting force Fz) is mainly taken. When the cutting depth is 0.5 mm, the FZ difference between initial assembly and reassembly is the largest, 13.2%, and when the cutting depth is 2 mm, the FZ difference is the smallest, 0.88%. When the cutting depth changes from 1-1.25 mm, due to the small change of cutting depth, the difference of FZ fluctuates under the law of overall decline.

The influence of blade replacement on cutting force at different cutting depths is shown in the table. As can be seen from the table, generally speaking, in the process of cutting depth from small to large, the impact of blade replacement on cutting force changes from large to small. Compared with reassembly, the overall change range is large. When the cutting depth is 0.5 mm, the FZ difference between the newly installed and the new tool is the largest, 25.7%, and when the cutting depth is 2 mm, the FZ difference is the smallest, 1.9%. When the cutting depth changes from 1-1.25 mm, similar to reassembly, when the change of cutting depth is small, the difference of FZ fluctuates under the law of overall decline.

From the above effects of reassembly and tool change on the cutting force, it can be concluded that when measuring the cutting force, the reassembly of the blade has little effect on the cutting force, which may be because the reassembly only changes the installation position, the blade itself has no change, and the change of the cutting force is slightly smaller. However, the replacement of the blade has a great impact on the cutting force, which may be because the tool change not only changes the installation position of the blade, but also has differences between the blades. Therefore, the cutting force changes greatly. It can be said that the change of cutting force caused by tool change is enough to cover up the change of cutting force of the material itself. Therefore, when measuring the cutting force of materials later in this paper, a knife is used to cut a group of samples at one time.

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