In the gearbox of the press, the screw is mainly broken by a large shear force. After clarifying the cause of the screw fracture, the corresponding countermeasures can be made. Therefore, the most critical problem is how to balance the shear force on the screw. From the past experience, it is known that the screw is prevented from being sheared by the shear force. The method is to add a locating pin, and the locating pin size is determined by calculating the shear force and strength check of the screw.
It is decided to insert three flat keys with a width of 40mm and 80mm between the lower surface of the gearbox and the surface of the bed to withstand the shearing force. Two keys are used in the lateral direction, and the horizontal and vertical shearing forces are balanced by a key in the longitudinal direction. The shearing forces on the gearbox all act on the flat key. The specific operation is as follows: First, three key grooves with a width of 40 mm and a depth of 12 mm are machined on the lower surface of the gear box. Then, three key grooves with a width of 40 mm and a depth of 10 mm are processed at corresponding positions on the surface of the bed, and the flat keys are fixed to the bed by screws.
The four M16 screws that secure the end cap of the cage at the rear end of the clutch spindle are easily broken, causing the cage to move forward and backward during operation and interfere with the friction disc. The two M16 screws on the front end of the clutch main shaft fixed helical gear end cover are also very easy to break. When the machine tool suddenly stops, the large helical gear in the gear box drives the small helical gear to rotate due to inertia, so that the small helical gear axial force is outward and small. The helical gears are thrown outwards, and the workers who fall and smash the wounds have great safety hazards.
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