Machining skills of common arcs in CNC turning (2)

September 02, 2022

Second, the first cone and the arc method

In this method, the excessive cutting allowance is first cut off by the method of the car cone, and the last arc cutting path is formed by cutting the arc, as shown in FIG. 4 .

Figure 4

N10 G01 X102 Z-30 F0.3;
N20 G90 X100 Z-50 I-5 F0.2;
N30 I-10;
N40 I-15;
N50 I-20;
N60 G01 X60 Z-30 F0.3;
N70 G02 X100 Z-50 R20 F0.1;

When it is a convex arc, the length of the ab segment can be calculated according to the geometric knowledge, and then the car cone, and finally the arc, as shown in Fig. 5.

Figure 5

Db=1.414R+R=0.414R
Ab=1.414*db=0.585R

To retain a part of the finishing allowance, then ab takes 0.5R.

Ab=bc

According to the method in 1, the taper is first processed, and then the arc is refined.

Third, the conclusion

In CNC machining, the machine tool operator is often the compiler of the part cutting program, which requires the programming process to be simple, easy to adjust, and high in machining accuracy. When there is no CAD drawing software, computer or other auxiliary calculation tools at the operation site, programming the cutting arc by the above method can greatly reduce the calculation amount. The idea is simple, the process is decent, the service life of the tool is prolonged, and the precision of the processed parts is high, which brings convenience for the processing of the arc-shaped parts.

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Author:

Ms. SU LAN RONG

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susu@cn-tianhui.com

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