After years of testing, we have summarized some performance indicators to evaluate the quality of the reducer, especially the places that are prone to problems during the research and development process of the reducer.No one can escape these pits.Whether it can be solved and when it will be solved depends on the strength of research and development.Therefore, the next time a reducer manufacturer comes to your door, you can ask them if they have encountered these problems, and you will know whether this company is reliable or not.
oil spill
No matter what the reducer is, this is a problem that must be faced.The cause of oil leakage is more complicated, involving the brand of oil seal, oil seal assembly, shaft processing technology, use method, etc., and oil leakage can be divided into real oil leakage and fake oil leakage.
The so-called false oil leakage refers to the oil leakage that occurs shortly after operation, the amount of oil leakage is not much, and it will not appear again after a short period of time.This is generally an internal pressure release, and once the pressure is released, everything will be fine.The timing of the real oil leakage is not certain, it may be leaked at the beginning, and it is likely to be a product quality or assembly quality problem at this time; it may also appear after a long time of operation, which is generally a problem with the life of the oil seal (use improper exception).
Many people are willing to use oil spills to attack domestic reducers.That's right, it is true that on this issue, it is true that the probability of occurrence of domestic reducers will be relatively high, which may be due to immature technology or the use of relatively ordinary oil seals.However, it must be said that this is by no means a characteristic of the domestic reducer. We will not take this blame, it is an imported reducer. Let’s not talk about the brand. It is not one of them. I have also tested for oil leakage.Those customers who have used imported brand robots in large quantities will also know this problem.As for how the manufacturer explained it, I don't know.So it's not that imported ones don't leak oil, it's just that the probability is small and you don't know it.
precision
There are two types here, one is the angular transmission accuracy, which is marked in the manual of the reducer, which affects the absolute positioning accuracy of the robot; the other is the repeatability of positioning accuracy, which is not in the manual of the reducer, which is It affects the repeated positioning accuracy of the robot.Angular transmission accuracy generally has professional equipment for reducer manufacturers, but customers can also design some simple methods to measure it.Repeat positioning accuracy is the same.
For the new reducer, many manufacturers are OK to achieve the nominal 1 arc minute or less, but the biggest problem is consistency and stability.Maybe most of the manufacturers have met the accuracy standard at the beginning, but after a few months, either the accuracy jumps up and down, or it just gets worse and worse.
The same is true for repeat positioning accuracy. It is no problem to achieve high repeat positioning accuracy in a short period of time, but it will be difficult to maintain it after a long time.
fever
This is more intuitive, but a point that less people pay attention to.In fact, the heat is also related to the accuracy mentioned above.The accuracy of the reducer depends on the degree of meshing of the gears. If the meshing gap is too large, the accuracy of the reducer will be poor. However, if the micro-interference method is used, the accuracy will be improved, but it will cause excessive heat generation.On the RV, the difference in heat generation using the Teijin structure is not so obvious, but for the same harmonic reducer, the heat generation of different brands is much different.Among other things, among harmonics, HD is the only manufacturer that can achieve both high precision and low heat generation.The title of big brother is by no means in vain.
Of course, heat is not only related to gears, but also related to grease and assembly. The quality of grease and the ability to assemble will have a significant impact.There are a lot of detailed craftsmanship here, which depends on the technical capabilities of each robot manufacturer.
life
The service life is also the point where domestic reducers are complained the most.Everyone always complains about the short life of the reducer, but there are not many people who can explain exactly what the short life is.
In fact, the life of the reducer mainly depends on the life of the bearing. Generally speaking, the bearing is the first to break, especially for harmonics. In the case of RV, the planetary structure is also a vulnerable point.
Many people complain that the bearings used in domestic reducers are not good.I have to say a few words to be fair, and there are two types of points: one is that the bearing is really not good, and it may be due to defects in materials or craftsmanship that the bearing just cannot reach that life; but, the other situation is, Even if you use the same bearing as HD, you can't guarantee 100% life expectancy.The reason is that in the harmonic industry, the bearings have a certain probability of premature wear, which I have been confirmed by major manufacturers.That is to say, this is an industry bottleneck, that is, there is a small probability that the bearing will fail for no reason, and it cannot be found out in the early stage.At this time, there is actually a gray area where there is a problem with the reducer itself or the customer.There are also differences in this probability between different brands.You have to ask the manufacturer what the probability is, and they probably won’t be able to answer, or dare not answer you directly. Generally, the official answer will be within 10%.This is a statistical probability.Then how did this statistical value come from, and who has such a large sample to count, you know.
The situation of early wear and tear will generally appear in a few months to a year, depending on the operation situation, so those reducer manufacturers who take advantage of the explosion of robots to ship in large quantities should pay attention. If this probability was not controlled during the previous research and development, The more shipments now, the bigger it will be in half a year.Many people advocate that the domestic reducer has ushered in the spring, but I think many people are producing one time bomb after another. One day it is detonated, it will be a landslide.
transmission efficiency
In fact, this has something to do with the precision, heat, grease, etc. mentioned above.The transmission efficiency is also one of the important evaluation indicators of the reducer.To test the transmission efficiency also requires professional equipment, and it is difficult for customers to measure specific data by themselves.However, it is possible to do horizontal comparisons.Heat generation is the most intuitive way of comparison. Junior high school knowledge tells us that energy is conserved. If the heat generation is high, it means that more power of the motor is used to eliminate friction, and the output power will naturally decrease.If the output power is less, the load capacity will naturally be weak, there will be no force, the acceleration will naturally be small, and the beat will naturally be slow.
