Year1
- 规格：
- WH-VI-120
- 重量：
- 125KG
- 包装：
- 木箱
The spline parts of the parts are high-frequency quenched or have very high hardness, large~, the parts also have reverse rotation during the working process, and the working stress has not caused excessive load. At this time, the part is also under the action of longitudinal shear stress. Fatigue cracks first occur in the spline tooth groove and develop towards the axis center. After cracks are generated on the longitudinal shear plane, they develop angularly under the action of normal stress. Since the part has reverse rotation. Therefore, after the fracture occurs on both sides, it develops toward the center of the tooth at the same time. The fracture after the fracture is concave in shape on each tooth, resembling a lotus petal. This type of fracture is similar to a star-shaped fracture, which is a typical torsional fatigue failure where the stress is close to the strength. The difference is that due to high-frequency quenching, the splines have more obvious positive fracture characteristics after tooth damage.
Super Front is the first choice for top quenching machine of male spline shaft quenching equipment
As mentioned above, it can be seen that the fracture of the drive shaft is related to the design structure and material strength. First of all, the drive shaft is integrally quenched and tempered. Its hardness is ~ and its strength is low. The strength potential of the material is not used at all. This is one of the main reasons for the breakage of the drive shaft. Secondly, high-frequency quenching at the splines not only failed to improve the fatigue strength of the parts, but also greatly reduced the fatigue strength of the spline roots, which is another reason for fracture. Thirdly, the taper fit of the drive shaft often fails to transmit torque due to loosening and wear of the eccentric bolts. Instead, it causes stress concentration at the spline root and premature fatigue failure at the spline root. This is another reason for fracture.
Root fracture is due to repeated loading during the rotation of the gear, which produces stress concentration at the dangerous section of the tooth root. When the bending stress exceeds the bending fatigue limit of the material, fatigue fracture of the gear may occur. In order to prevent fatigue breakage due to fatigue, in addition to appropriately increasing the hardness of the hardened layer of the wheel, strengthening the surface of the gear teeth, maintaining a reasonable hardened layer depth, and forming favorable residual stress in the profile hardened area, the shape of the tooth profile hardened layer distribution is also important. Broken teeth have important consequences. The splines are quenched by high-frequency heating, and the surface hardness is very high~ but the hardened layer is shallow, and the overall strength of the part is not high. To this end, after the structure of the drive shaft is optimized, the internal splines of the full-body spline shaft and the drive shaft adapter are subjected to medium frequency quenching. The hardened layer of the parts can reach ~ to improve the fatigue strength. Judging from the indoor torsional fatigue test results, the limited life of the spline shaft using medium frequency quenching under overload conditions is increased by dozens of times.
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