How much do you know about the model of CNC blades? Today, Xiaobian will tell you about the knowledge here.
Indexable insert type and ISO indication rules:
1. The code expressed as the shape of the blade
2. The code that represents the rear angle of the main cutting edge
3. The code expressed as the dimensional tolerance of the blade
4. It is expressed as the code in the form of chip breaking and clamping of the blade
5. It is expressed as the method of expressing the length of the cutting edge
6. The code expressed as the thickness of the blade
7. It is expressed as the code of the light trimming blade and R angle
The meaning of other numbers
8 is a code that indicates a special need;
9 represents the code of the feed direction, such as code R represents the right feed, code L represents the left feed, code N represents the middle feed;
10 is the code of the chip breaker type;
11 indicates the material code of the tool company.
Cutting speed
Calculation formula of cutting speed vc:
During the ceremony:
D - the rotation diameter of the workpiece or the tip of the tool, in mm;
n - the speed of the workpiece or tool, in r/min.
The speed at which a normal lathe processes a thread
Turning thread spindle speed n, when cutting threads, the spindle speed of the lathe is affected by various factors such as the pitch (or lead) size of the processed workpiece, the lifting characteristics of the driving motor and the speed of thread interpolation operation, so for different numerical control systems, there are certain differences in the speed of turning thread spindle n.
The following is the formula for calculating the spindle speed when turning threads on general CNC lathes:
During the ceremony:
p - the pitch or lead of the thread of the workpiece, in mm;
k - insurance factor, generally 80.
Calculation of the depth of each feed for the machined thread
Number of threading passes
1) Rough machining
The empirical formula for calculating roughing passes: f roughness = 0.5R
During the ceremony:
R ——刀尖圆弧半径mm；
f ——粗加工走刀量mm。
2) Finishing
During the ceremony:
Rt – contour depth μm;
f - feed mm/r;
rε——刀尖圆弧半径mm。
Distinguish coarse and fine turning according to feed and chip breaker:
f ≥0.36 roughing
0.36＞f ≥0.17 半精加工
f<0.17 Finishing
It is not the material of the insert that affects the roughing and finishing of the insert, but the chipbreaker. The cutting edge chamfer is less than 40μm for sharpness.