low price robotics slewing bearings

1.Mounting bolts for slewing bearings

The mounting bolts of the slewing bearing should choose 8.8 or 10.9 or 12.9. The choice of high-strength mounting bolts for the slewing bearings. The mounting bolts of the slewing bearing must use high-strength bolts, currently high-strength bolts.

There are grades 8.8, 10.9 and 12.9. Then, how to choose high-strength bolts to meet different working conditions. one. The load changes frequently and the requirements for the fatigue strength of the bolt are extremely strict. The bolt strength grade can be 8.8. Such as general mine metallurgy and other equipment with bearings. two. The general construction machinery bolt strength grade and the use of 10.9 grade. three.

High requirements for bolt static strength under rated load and bolt yield strength under maximum load, but less stringent requirements for fatigue strength. The bolt strength grade can be 12.9 grade. That’s it. High-strength bolts correspond to the selection of slewing bearings in different occasions. Generally, 10.9-grade mounting bolts are selected for the installation of slewing bearings, which have obvious advantages in hardness, toughness and strength.

2.Why is the static load capacity the main load that the slewing bearings?

Slewing bearings are usually subjected to large loads. Under the premise of meeting the bearing capacity and service life, there should be a certain safety factor. To ensure safe use and reliable life. The rotational speed of the slewing bearing is generally very low. Basically below 10Rpm.

Therefore, its carrying capacity mainly refers to the static load capacity. There are various methods of competition and ability theory calculations. Among them, the bearing curve diagram is one of the methods commonly used at present. Because most of the slewing bearings work under eccentric load. It bears axial load, radial load, and also bears overturning moment, and the force is complex.

Therefore, computer programs are usually relied upon to draw load-bearing curves. The load-carrying curve is also the load-bearing limit of the slewing bearing in work, and it is also the main basis for the selection of the slewing bearing. The embodied static load is the main basis for the bearing capacity and life reliability of the reference slewing bearing.

3.How to choose external tooth slewing bearing and internal tooth slewing bearing

The slewing bearing with ring gear has the function of transmitting power and simplifying the host mechanism. Among them, the internal gear slewing bearing has compact structure, low contact stress during transmission, small wear, grease, easy to maintain lubrication for a long time, good dustproof effect, and the protection requirements for meshing parts are relatively better than external teeth meshing effect.

External tooth structure slewing bearing, tooth shape processing and detection methods are fast and convenient. High manufacturing precision. It is easy to obtain the highest precision of grinding teeth, and can maximize the use of support space. And the pitch circle diameter of the tooth shape is large.

Larger transmission ratios can be obtained. At the same time, the circumferential force and torque of the pinion can also be reduced, thereby saving efficiency. Of course, in terms of manufacturing cost, the internal teeth are mostly gear shaping, which takes a long time, and the external teeth are mostly gear hobbing, which is fast. Therefore, internal gear bearings are generally much more expensive than external gears.

The quenching and tempering methods and quenching effects of 42CrMo and 50Mn materials are very different for the slewing bearing:

First of all, it should be noted that so far, there is no detailed and experimental data, or actual use effects, to prove the qualitative difference between 42CrMo and 50Mn materials. In the experimental results, there are differences in chemical composition, metallographic structure, mechanical properties and low temperature impact energy, but it is not enough to prove the difference between the two.

So what are the superior properties of 42CrMo material? First of all, the high stiffness and high toughness of 42CrMo can achieve perfect unity through quenching, tempering and quenching. So far, 42CrMo has been used in large bearings, heavy-duty bearings, high-rigidity preloaded bearings, and high-precision bearings. material.

In terms of quenching and tempering, in order to maximize the quenching and tempering effect, the quenching and tempering process can be arranged after rough turning and rough turning of the channel shape of the bearing. Regarding tooth surface quenching, it can be arranged to quench and temper at the same time after rough hobbing to enhance the effectiveness of quenching and tempering.

Therefore, the quenching and tempering after the blank is far inferior to the quenching and tempering after the rough turning, even after the rough hobbing and rough turning of the channel.