Turned parts are a kind of parts that make full use of the CNC lathe to complete the production of enterprise products on the lathe, and use the automatic rotation of the workpiece and the uniform linear motion or uniform circular motion of the CNC tool to change the appearance and specifications of the blank. It is refined into a standard applicable to design drawings. In the actual production and processing process, turning parts are not static, so the choice of turning parts processing tools is also very knowledgeable. Today, Wofu will discuss with you the selection skills of turning parts processing tools.
1. Confirm the entering angle of the CNC tool.
Among the entering angles of conventional CNC tools, those suitable for CNC machining are usually between 90° and 95°, especially 91°, 93°, and 95° which are the most frequently used. The entering angle close to 90° promotes the cutting speed to be along the axis of the workpiece, and it is not easy to apply vertical force to the workpiece to avoid vibration and deformation (the production and processing of thin-walled parts is even more important). The entering angle is usually ensured on the shank.
2. Determine the angle of the tool tip and select.
The specific types of blades we can use are as follows:Round blade (R head), 90 degree square blades (S head), 80 triangle blades (beginning with C), 80 degree convex triangular blades (beginning with W), 60 degree triangular blades (beginning with T), 55 degrees Prism blade (beginning with D), 35 degree diamond blades (beginning with V). Those CNC tool styles basically cover about 90% of the basic turning inserts. These types of inserts are sorted from the compressive strength of CNC tools: R, S, C (W), D, V. R blade has the highest compressive strength and V the lowest. However, the higher the strength, the greater the resistance and the greater the risk of vibration. Therefore, people often choose R, S, C (W) for finishing. For rough machining, everyone will choose D and V. The profiling work capacity necessary for finishing is V the best and R the worst.
3. Confirm the front and rear corners of the CNC tool.
Negative rake angle CNC cutters have good rigidity and are not easy to chip, so they are suitable for finishing, while positive rake angle inserts are lighter and more suitable for finishing. The rear angle and the rake angle have a matching relationship. Usually, the negative rake angle blades are mainly all 0 degree rear angles. And the positive rake angle insert has 5°(B), 7°(C), 11°(P) three common rear angle matching (only refers to turning parts processing). Common combinations include: CC/CP (C type positive rake angle blade 7°/11° clearance angle), DC (D type positive rake angle blade 7° clearance angle), VC/VB (V type positive rake angle blade 7°/ 5° clearance angle), WB/WC (W-type positive rake angle insert 5°/7° clearance angle), those combinations are the blades commonly used in basic deep processing (the front and rear corners are determined).
The combination of the three leads to the conclusion that the types of CNC tools commonly used for deep processing are as follows:
95° entering angle arbor + CC blade;
93° main angle boring tool + WB/WC/DC/VC/VB blade;
91° entering angle arbor + DC/VC/VB blade.
The 93° main angle boring tool +DC in this table is a personally recommended better deep machining measure (referring to the turning radial only). This measure matches the main parameters of turning parts processing, and the actual effect of production and processing should be current One of the best in stage turning. I have tried 1.6 roughness of several different materials, and 0.8 roughness of another steel part is because of the inner hole and the diameter of the shank is limited, so I can only use 95° entering angle shank + CC blade.