Also known as rolling knives, rolling heads, rolling heads, rolling knives, rolling knives, squeezing knives, calendering knives, rolling reamer, roller reamer, needle reamer, rolling knives, mirror tools, etc. The title is different, but the method of using the tool and the principle of tool processing are the same.
Tool diameter adjustment method:
1. Measure the tool diameter with a micrometer.
2. Push the scale adjustment sleeve to the left and right while rotating in the direction of the handle to adjust the diameter of the tool. The left-handed rotation reduces the right-handed rotation, and each scale value is 0.0025mm.
3. After the diameter is adjusted, the diameter will be automatically locked when the aluminum shell is released.
4. When processing blind holes and stepped holes, the bottom is about 0.5mm and cannot be processed. The needle roller can gently touch the bottom of the hole (the bottom has a taper, the R angle of the needle can not interfere with the bottom of the hole to prevent the tool from being stuck, resulting in a quality accident).
The principle of rolling processing: it is a kind of pressure finishing process, which utilizes the cold plasticity characteristic of metal in normal temperature state. The rolling tool is used to apply a certain pressure to the surface of the workpiece to make plastic flow of the surface metal of the workpiece and fill it into the original. Residual low concave valleys, while achieving rough surface roughness of the workpiece. Due to the plastic deformation of the rolled surface metal, the surface layer is cold hardened and the grain is thinned to form a dense fibrous shape, and a residual stress layer is formed, and the hardness and strength are improved, thereby improving the wear resistance and corrosion resistance of the surface of the workpiece. Sex and fit. Rolling is a non-cutting plastic working method.
Advantages: No cutting technology is safe and convenient, can accurately control precision, several major advantages:
1. Improve the surface roughness, and the roughness can reach Ra≤0.08um.
2. Correct the roundness, the ellipticity can be ≤0.01mm.
3, improve the surface hardness, so that the force deformation is eliminated, the hardness is increased by HV ≥ 40 °
4. There is residual stress layer after processing to increase fatigue strength by 30%.
5, improve the quality of the coordination, reduce wear and extend the life of the parts, but the processing costs of the parts are reduced.