in stock slewing bearings suppliers

1.Why do slewing bearings need to grind their teeth? Cause Analysis

With the continuous development of industrial machinery, there are higher and higher requirements for the transmission stability, transmission accuracy and bearing capacity of the motor-driven pinion and the slewing ring gear. Regarding the slewing bearing, whether it is external or internal, the normal process includes gear shaping, gear hobbing, and milling.

According to the design standard, the general gear accuracy is grade 8 or grade 9. Rough insertion and fine insertion can reach grade 7 tooth precision. The tooth precision is mainly reflected in the rotation precision. Specific indicators:

1. Cross pitch and common normal length

2. Common normal deviation

3. Tooth jump (tooth jump of finished turntable bearing)

4. Tooth width, tooth thickness, tooth shape and tooth direction, etc. (generally not marked in the drawing)

In order to improve the strength, hardness, wear resistance and toughness of the ring gear and gear, we usually use surface quenching on the teeth of the ring gear when machining the slewing bearing teeth. Easily damaged, etc. Tooth quenching has a great influence on the tooth accuracy.

After quenching, the ring gear will appear elliptical deformation, and the accuracy level will decrease. If the tooth accuracy requirements are high, the design requirements are usually not met after quenching.

If you want to achieve higher tooth accuracy after quenching, you need to Finishing the teeth, but the hardness of the teeth after quenching is high, and the conventional gear shaping or gear hobbing process cannot process the quenched teeth.

We usually use the grinding process. What is grinding? The grinding wheel is used as a tool to grind the processed gear tooth surface to improve the gear precision and surface roughness. It is suitable for steel gears with high hardness after quenching.

Grinding teeth can achieve high surface roughness, and the quenched teeth can reach Ra0.8 surface roughness through grinding, and the tooth jump can reach 0.03-0.1mm. Grinding can correct the deformation of the gear during the heat treatment process, ensure the accuracy of the finished gear, improve the meshing accuracy, achieve the purpose of precise transmission, and reduce vibration and noise.

2.How to improve the tooth machining efficiency of the slewing bearing?

The slewing ring bearing is a large bearing that operates at low speed and heavy load. Usually the inner ring or outer ring has teeth. It is used to connect large components that require relative rotation. It is widely used in automated industrial machinery, construction machinery, wind power equipment, port machinery and other fields. ,

In the whole cycle of the slewing bearing from the forging to the finished product until it is sent to the user, the tooth processing process takes up a lot of time, and the length of the delivery time depends to a large extent on the processing efficiency of the slewing bearing teeth.

In recent years, due to the country’s strong investment in infrastructure, new energy equipment and other fields, the market demand for slewing ring bearings has also increased sharply, and the supply is often in short supply. On the other hand, there are many domestic manufacturers of slewing ring bearings. Minimizing costs on the premise of quality is the key for enterprises to stand out in the fierce market competition.

Gear machining is the longest time-consuming process in the production process of slewing bearings, and it has always been one of the most important factors restricting the production efficiency of slewing bearings.

The traditional slewing bearing tooth machining usually has two methods: gear shaping and gear hobbing. In order to adapt to the improvement of processing accuracy and production efficiency requirements, gear hobbing and gear shaping technology are constantly developing in the direction of full numerical control, high speed, high precision, and intelligence, but the processing efficiency has not yet reached the ideal state, especially the processing of internal teeth. Only the gear shaper can be used, the cutting amount of each feed is small, and the processing efficiency is low.

In recent years, a machining method of CNC high-speed tooth milling has been gradually promoted in the slewing bearing industry. There are two types of internal teeth and external teeth, which are processed by the profiling principle, with high processing efficiency and large feed amount.

It is suitable for large diameter, large Modular slewing bearing processing, especially internal gear processing, is 5-8 times more efficient than traditional gear shaping, which greatly shortens the production cycle of slewing bearings.

Gear milling, gear hobbing, and gear shaping have their own advantages and disadvantages in terms of processing efficiency and equipment cost. In the case of sufficient market demand, the efficiency of gear milling is better than that of gear hobbing and gear shaping, and the cost of gear milling is also lower than that of gear hobbing and gear shaping.