What is the appropriate temperature for gear heating assembly without affecting material and hardness?

Technical solution:

1, gear assembly can be heated to the highest temperature depends on the size of interference, usually there are two kinds of coordination between the gear and the shaft, one is with the keyway, the other is completely interference - without the keyway. Interference without keyway is generally very large, enough interference to ensure that the hole and shaft do not slip, the two form locked.

2. The interference of the inner hole of the gear with keyway is not large, and the heating temperature does not need to be very high to achieve smooth installation. The interference of gears without keyways varies according to their diameters. Some pinion interference of 5-7 wires is enough, while larger diameter gears can even reach more than 10 wires.

3 under normal circumstances the gears, the gear heater heated to 150-180 degrees can realize the interference assembly, for large diameter, quality hundred kilograms or tons of gear is slightly higher heating temperature, small gear clamp, pliers, or could be used directly to wear gloves with assembly, tend to be the big gear lifting, transfers, alignment, landing points several steps to install, There is a certain process, assembly needs a longer time.

4, gear tempering parts better heating temperature should not exceed 250 degrees, should take into account low temperature tempering, hot charging temperature is 30-40 degrees higher than the use of temperature is more reasonable, so many manufacturers choose 180 degrees as the highest temperature. During the design, the expansion coefficient should be calculated clearly, the reasonable interference amount should be set, and the heating temperature should be well controlled so as not to change the material and hardness.

5, if the interference is very large, the gear heater and the press can be used together, first heated to a certain temperature, or can not be directly hot jacket then use the press for pressing. The specific situation of gear quenching can be learned from the supplier, so as to have a good idea, only reasonable design can achieve the best effect.

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