Factors Affecting Low Hardness of Driving and Slave Bevel Gears

 On the premise that the position of the installation shaft is correct, it is mainly due to the change of the installation distance of the gears, the instantaneous rotation center distance of the two gears changes, resulting in a large gear. It is caused by the change of the small end tooth gap. A pair of driven and driven bevel gears are equivalent to cylindrical gears with large and small ends. The number of teeth is the same as that of bevel gears, but the center distance is different. For example, if the installation distance of the bevel gear changes the installation distance of the driven bevel gear, it will increase. The center distance of the two pairs of equivalent cylindrical gears at the small end will change by the same distance. Due to the axial displacement of the bevel gear, the pitch circle and index circle of each pair of equivalent cylindrical gear transmission no longer overlap, the meshing angle and pressure angle are different, the gap between the teeth changes, and the gap between the gear teeth is larger. The amount of change at the small end Different, the specific change varies with the direction the gear is moving.

The following aspects mainly affect the factors of low hardness of the driving and driven bevel gears:

1. Blanks need to be strictly controlled. Normalized structure, strip shape, normalized hardness, etc.

2. Strictly implement the heat treatment operating procedures in the process documents, and do not change the process parameters at will. On-site technicians should go deep into the furnace, supervise the process flow, strengthen the quality control of the production process, and ensure that the problems on the production site can be obtained in time and dealt with correctly and effectively.

3. During the production process, checks should be made at any time according to the process documents to prevent low hardness due to changes in conditions.

4. Thermal instruments, instruments, hardness machines, regular identification of standard thermocouples and other testing instruments, and marking and filling in records to ensure that the testing data is accurate and reliable.

5. Install a set of temperature monitoring instruments on the continuous tempering furnace to prevent them from "running out of temperature" and causing low hardness of the driving and driven bevel gears.

6. Grinding should be carried out in accordance with the requirements of the process documents to prevent grinding and annealing.