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2023

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Clamping Method for Heat Treatment of Motorcycle Sprockets


Clamping method for heat treatment of motorcycle sprocket:

For gears with spline hole shrinkage after heat treatment, tooling with large heat storage capacity, tooling with large width and contact surface (to reduce roundness distortion), and measures to reduce carburizing and quenching temperatures, reduce the depth of the hardened layer, and increase oil temperature can be used.

For gears with enlarged spline holes after heat treatment, tooling with reduced heat storage, tooling with narrow and small contact surfaces, and measures to appropriately increase carburizing and quenching temperatures, increase the depth of the hardened layer, and appropriately reduce the temperature of the quenching oil can be used.

For gears with symmetrical sides (Figure 4-67), it is best to machine identification grooves (grooves) on the tooth top circle, which can ensure that the broach feeds and shaves in one direction. Adopt the cross beam string clamping method. When the gear spline has a large taper and roundness distortion, it can be placed horizontally, with the easily shrunken part facing downward. The spline blade should face downward to ensure that the spline distortion is qualified. If the spline hole is not required to be hardened, it can be slowly cooled after carburization, then broaching the spline and conducting induction hardening on the tooth. If the spline hole is required to be hardened, a mandrel can be used to solve the shrinkage hole, but it takes time.

For gears with different shapes and sizes, changing the clamping method is beneficial to reducing internal spline distortion. When the gear has a simple shape and thick wall, it can be stacked. When assembling gears with large and small ends, the top layer of the gear should have the large end upward, as shown in Figure 4-68.

When the shape of the gear is in the form of a thin plate, suspension clamping can be used. For gears with large and small ends, the large end should be clamped outward, as shown in Figure 4-69.