We often encounter many problems in the turning process, for example, chips wrap around the workpiece, wrap around the tool, affect the surface finish of the workpiece, affect the processing efficiency, and even make it difficult to proceed in the follow-up process.
Then once the crumbs are removed,
How to do it?
This is , the relationship between cutting parameters and iron filings
Vertical axis: represents the depth of cut Ap
Horizontal axis: represents the feed rate F
Specifically, depth of cut and feed can directly affect chip shape
why?
Come on, look at the picture below
picture
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The picture on the left shows a small depth of cut, and the one on the right shows a large depth of cut
As the depth of cut is increased, the filings become thicker
Then, under the same degree of curvature of iron filings, thick iron filings are easy to break
To increase the feed rate is to increase the depth of cut in the axial direction. The reason is the same, so I will not draw a picture.
The reason is as simple as that:
Under the same degree of curvature of iron filings, thick iron filings are easy to break
Then, if the iron filings continue:
1. Increase the depth of cut Ap
2. Increase the feed rate F
If you use these two tricks well, you can solve most of the chip breaking problems
Of course, the depth of cut cannot be adjusted most of the time, the main thing is to adjust the feed rate (it is best to reduce the speed S, and F will increase, so as to improve the tool life). But too much feed will bring corresponding problems. The following two points you need to pay attention to.
Problem 1: As the cutting force increases, the strength requirements for the entire processing system increase, and vibration may occur. If there is vibration, it will not work, and other methods must be considered. (For details, please refer to the article on solving tool vibration that I shared before)
Problem 2: The smoothness decreases. In the case of the same fillet, the smoothness will definitely decrease when the feed is increased, so pay attention to the smoothness of the workpiece. (There is an empirical formula for the relationship between fillet and feed rate: Ra=(f*f**50)/re, the larger the feed rate, the smaller the corner fillet, and the greater the surface roughness obtained)
