Basic Knowledge of CNC Machining

CNC Machining is a method of processing various workpieces with mechanical processing equipment. The main processing methods of mechanical processing are turning, drilling, boring, milling, planing, honing, super finishing and polishing. The precision and surface roughness of machining can be processed in a wide range, and higher machining accuracy and very low surface roughness can be obtained. These are the advantages of machining, so what else must you know about machining? What? The following Yuntuo Machining specifically introduces the machining knowledge that everyone wants to know.

Parts and functions of machining tools

1. Knife body————the fastening part of the tool;
2. Rake face — the face facing the direction of the cutting speed, (chips flow along it);
3. The main back — the surface opposite to the cutting surface;
4. Sub-back-the surface opposite to the processed surface;
5. The main cutting edge-the intersection line between the rake face and the main rear face (responsible for the main cutting task);
6. Minor cutting edge-the intersection line between the rake face and the back face, (a small part is responsible for trimming);
7. Tool tip————the place where the main cutting edge and the secondary cutting edge intersect;
 

The Role of Machining Geometric Plane

Unisontek cnc milling parts

1. Cutting plane-a plane passing through any point on the main cutting edge and tangent to the machined surface.
2. Base plane————A plane that passes through any point on the main cutting edge and is perpendicular to the cutting speed direction, that is, perpendicular to the cutting plane.
3. The main section — the section that passes through any point on the main cutting edge and is perpendicular to the main cutting edge's projection on the base surface. Through the main section, the relationship between the front and base of the tool, the back and the cutting plane, the front and the back, the front and the cutting plane; the front angle, the main relief angle, the cutting angle, and the cutting angle can be determined.
4. Auxiliary cross-section --- the cross-section perpendicular to the projection of the auxiliary blade on the base surface; determine the auxiliary rake angle and auxiliary relief angle (radial)

The Role of Machining Accuracy

1. Dimensional accuracy: Dimensional accuracy refers to how close the actual value of the dimensions such as the diameter, length, and distance between surfaces of the part is to the ideal value. The dimensional accuracy is controlled by the difference between the size diameter and the relief angle α diameter. The dimensional tolerance is the allowable variation of the part size during cutting.
2. Shape accuracy: Shape accuracy refers to the degree of conformity between the actual shape of the line and surface on the processed part and the ideal shape
3. Position accuracy: Position accuracy refers to the degree of conformity between the actual position of the point, line, and surface on the processed part and the ideal position.
 
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