1. External circular return
The ordinary external circular turn is to treat the external circular surface of the part to obtain the dimensional, morphological and surface quality required. The ordinary external circular turn tools are divided into 95 °, 90 °, 75 °, 60 °, 45 °, etc. According to the main deviation angle of the tool, the axial force is larger and the radial force is smaller when cutting 90 ° and the main angle of deviation at 95 °. Also perform a 45 ° chamfer shooting.
The economic efficiency of the negative angle blade is better than that of the positive angle blade, while the positive angle blade is sharp and has a light cut speed, however, the size of the angle blade Positive is generally small, and it is only suitable for treatment with a small backrest and a small volume of power. The same shape, size and arc of the cutting point). The blade forces of different shapes are different, the effective cutting length is different and the number of cutting tips available is also different.
2.
The turn to the final face refers to the cut and treatment of the final surface of the room by the main cutting edge.
1. things to note against the car
1) The tip of the turn tool must be aligned with the center of the room to avoid a boss in the center of the final surface where the car comes out.
2) The knife is tilted at the end of the end, and when the knife is loaded with a large quantity, it is easy to stab the knife. Choose the A measurement option: when the rough car is rough, AP = 0.5 ～ 3 mm,
When you care in detail, AP = 0.05 ~ 0.2 mm.
3) The diameter of the final side varies from outside to the center, and the cutting speed also changes.
4) If the final surface with a larger diameter is in the car, if there is a concave center or a convex belly, check if the rotation tool, the square tool holder and the large roller board are locked . In order to make the filming tool with horizontally, the middle board in the middle must be fixed to the bed and the knife support must be used to adjust the amount of the back eating tool.
5) When the final quality of the final facials are high, the last cut must be cut from the center to the outside.
2. Quality analysis of the vehicle surface
1) The final surface is uneven, causing a convex and concave phenomenon or a “small head” is left to the center of the final surface; Center of the room, the back of the tool is too large and the turn has a gap and the sliding plate moves.
2) Poor surface roughness. The reason is that the rotation tool is not lively, the manual knife shakes unevenly or too fast and that the automatic volume of food is not selected correctly.
3. Inner hole
The characteristics of the rotation of the inner hole are: in the semi-fermized state, it is not practical to observe the conditions for eliminating fleas and affecting the quality of treatment. The cutting of deep holes often causes vibrations of the stem of the tool, causing rapid wear on the edge of the cut. When you perform an external circumstantial turning point, the length of the part and the size of the selected tool rod will not affect the overhang of the tool, it can therefore resist the cutting forces generated during the treatment. When the boredom and the inner tower turned, since the depth of the hole determines the overhang, the opening and length of the part have large limits to the selection of the tool.
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