Technical gap of RV reducer
The technology required for RV reducers is very high. The core difficulty lies in the close cooperation of various processes.
Tooth surface heat treatment, which is the input condition, the stress residual under the rough machining precision, and the stiffness strength of the surface should be consistent during the heat treatment;
The processing precision, the outer surface of the heat treatment surface is hard and soft, and the processing removal amount is different, so that the variance of the performance of the exposed portion is the key;
Part symmetry, different parts should be consistent at different angles;
Group technology: how to cooperate with each other;
Assembly accuracy: such a high precision assembly;
The result of the total distribution of the above tolerances is wear and life;
Power aspect
Difficulties in simulation: After modeling the multi-body dynamics simulation of dynamics, it is possible to know the vibration of each order;
Nonlinear features, causing great differences, once the resonance point is near the working point, it is affected;
Coupling with the system integration, the operating point (rated speed) of the integrated robot as the excitation frequency will cause the component to be damaged. The range of system operation is often continuous speed regulation. The 6-axis robot always has one axis that may be re-rated. Near 20%, unless well designed and implemented;
The product parameters fluctuate greatly. In such a precision matching system, the clearance/interference fit is only a few times different, so the contact stiffness/meshing stiffness is several times different. The large change of the stiffness matrix causes the natural frequency fluctuation.
Life optimization and iteration aspects
A stable car and a vibrating car may have many times the lifespan. I also know where the life is going;
Some material things that do not go through the real environment full life cycle testing can not find the problem. Therefore, there must be a round of problems and then iterative design process.
At present, the problem faced by robots seems to be that 60% of the price can't be done, and 90% of the price makes 30% of the life. In fact, life itself is a sign of the level of the machinery industry.
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