How to design a good sharpening shaft?
Views : 1991
Author : Mr. Jiang
Update time : 2021-05-21 20:26:11
A good sharpening shaft should have strict requirements for the following parameters:
1. Length. For round knives with OD less than 180 mm and ID less than 100 mm, the effective length of the sharpening shaft should not exceed 250 mm. For round knives with OD less than 250 mm and ID less than 135 mm, the effective length of the sharpening shaft should not exceed 300 mm. For round knives with an OD exceeding 250 mm and an ID exceeding 135 mm, the length of the sharpening shaft basically has no effect on the grinding rigidity. Unless it is a round knife with an OD greater than 300 mm, the work shaft is generally not used instead of the sharpening shaft.
2. Perfect fit. The principle is to be tight, not to be loose, but slitting tooling can be amounted. In this regard, many factors should be considered when determining the diameter of the sharpening shaft. For example, before determining the shaft diameter, you must be clear about the tolerance range of the inner hole of the round knife and the bonded stripper ring in the original purchase contract. In addition, tolerances such as the ovality and taper of the inner hole of the blade and the bonded stripper ring must also be considered. According to experience, for a sharpening shaft with a shaft diameter of less than 100 mm, the outer circle should be 0.15 ~ 0.02 mm smaller than the measured value of the hole of the blade and the bonded stripper ring. For a sharpening shaft with a shaft diameter of less than 150 mm, the intermediate tolerance of the outer circle should be It is 0.02 ~ 0.025 mm smaller than the measured value of the hole of the blade and the bonded stripper ring.
3. Precision. The roundness of the shaft, the runout of the shaft shoulder, the concentricity of the outer circle of the shaft to the center hole, and the cylindricity should be less than 0.003 mm, and must not exceed 0.005 mm. For the sharpening shaft in the transformer industry, any tolerance cannot exceed 0.003 mm. Otherwise the error will directly affect the gap of the knife.
4. Hardness. Generally, tempering treatment is required, and the hardness must be tempered to at least HRC 38. If the requirement is higher, the surface can be nitrided to make the surface hardness reach HRC 52 ~ 55.
5. Convenience of operation. The shaft end surface must have a lifting screw hole so that the sharpening shaft can be hung up when it is not working. In addition, the shoulder should be milled on two symmetrical flat surfaces so that the operator can clamp it on the vise, so that the hydraulic nut can be tightened.
6. If it is better, both ends of the shaft should be threaded, and the protective cover should be screwed on when not in use to protect the center hole.
7. When not working, the sharpening shaft must be coated with oil to prevent rust.
7. When not working, the sharpening shaft must be coated with oil to prevent rust.
Regrinding Shaft for Slitter Blades and Bonded Stripper Rings
