How to completely eliminate the shaft breakage fault of the cutting machine in the flange type output reducer

1、 How to eliminate the risk of traditional "shaft breakage" with flange output

The broken shaft of traditional shaft output reducers usually refers to the twisting or breaking of the output shaft itself due to excessive torque or bending moment. The flange type output reducer solves this problem through the following methods:

Structurally, there is no "shaft" that can be broken: the output end of the flange reducer is a flange plate integrated with the gear, rather than an independent output shaft. The power is directly transmitted to the actuator (such as the screw or gear of the cutting machine) through the bolt holes on the flange, which physically eliminates the fault mode of "output shaft twisting and breaking".

Stronger rigidity and higher precision: The flange is rigidly locked to the load end through a ring of bolts, effectively preventing axial movement of the gear shaft during operation. This not only improves the overall rigidity of the transmission system, but also enhances the machining accuracy of the cutting machine, indirectly reducing abnormal loads caused by accuracy issues.

2、 Risk transfer: from "broken shaft" to "flange fracture"

Although the risk of shaft breakage has been eliminated, the flange reducer introduces a new potential fault point - the fracture of the flange itself or its connecting bolts. This is usually caused by the following reasons:

Overload and impact: When the cutting machine is stopped, started or stuck by a hard object, the instantaneous impact torque generated far exceeds the rated value, which may cause cracks around the flange root or bolt hole.

Improper installation: This is the most common cause of human error. If the flange connection surface is not parallel, the bolts are not tightened in diagonal order, or the tightening torque is not up to standard, it will cause uneven stress on the flange, generate additional bending moments, and lead to fatigue fracture after long-term operation.

Selection error: The rated output torque of the reducer does not leave enough safety margin. In theory, the maximum working torque required by the cutting machine should be less than twice the rated output torque of the reducer to cope with the overload capacity and sudden working conditions of the motor.

Manufacturing defects: Insufficient strength of flange materials, substandard heat treatment processes, or small transition corners during processing can all lead to a decrease in fatigue strength and may also result in fracture under normal stress.

3、 Systematic solution for achieving "zero axis breakage" operation

To truly leverage the advantages of flange reducers, it is necessary to carry out full process control from selection, installation, use to maintenance:

1. Accurate selection with sufficient margin

Accurately calculate the required torque based on the maximum load, acceleration, and inertia of the cutting machine.

Select models with rated output torque far greater than the calculated value, ensuring that the maximum working torque does not exceed 50% of the rated value, and reserving sufficient safety space for impact loads.

2. Standardize installation to ensure concentricity

Before installation, thoroughly clean the anti rust oil and impurities on the motor, reducer flange, and connection surface.

Ensure that the concentricity and parallelism between the motor shaft and the input end of the reducer, as well as between the output flange of the reducer and the load end of the cutting machine, fully meet the standards.

Strictly tighten all connecting bolts in the order of "diagonal, phased, and gradual", and use a torque wrench to achieve the specified tightening torque.