Is it normal for the bearing to vibrate?

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Is it normal for the bearing to vibrate? In addition to some vibrations that may exist in normal operation, the shaking of the bearing during operation may require attention, which may reflect the possible problems of the bearing. Let’s learn about it with the editor of Hengguan.

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  1. Is it normal for the bearing to feel shaking?

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Bearing shaking needs to observe the amplitude of shaking. Slight shaking may be caused by the resonance between the bearing and the machine during the operation of the equipment. Shaking within the allowable range is normal, but the vibration frequency or speed is too large, or the bearing is installed opposite to the bearing. For machinery with high precision requirements, adjustment and maintenance are required.

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The bearing vibration (acceleration) is divided into four grades: Z, Z1, Z2, and Z3; the bearing vibration (speed) is divided into four grades: V, V1, V2, and V3.

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Z and V grades are suitable for the vibration inspection of deep groove ball bearings within the scope of the standard by bearing manufacturers; Z1 and V1 grades are suitable for the inspection of bearing products with general requirements for bearing vibration; Z2 and V2 grades are suitable for Y series motors and Other motor bearings with corresponding requirements; Z3 and V3 grades are suitable for higher precision requirements when there are strict requirements for vibration.

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  1. Reasons for bearing shaking
  2. The mounting bolts are loose, causing shaking during work. In case of shaking when the slewing bearing is working, firstly check all the inner and outer ring mounting bolts immediately. Check for looseness and tighten as required.

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  1. The rigidity of the steel structure supporting the slewing bearing is not enough, and elastic deformation occurs during loading, causing the slewing bearing to shake as a whole, increasing the strength of the steel structure supporting the slewing bearing by 14 times.

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  1. Check whether the operation is overloaded. Overloading will also cause the slewing bearing to shake. Therefore, it is necessary to operate in strict accordance with the regulations.

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  1. Long-term overload operation will lead to the crushing of the raceway and the clearance is too large. If such a situation occurs, please notify the after-sales service of the slewing bearing to make adjustments to ensure the normal use of the slewing bearing. In short, in order to ensure the normal use of the slewing bearing, if shaking occurs during use, it must be stopped in time for inspection to prevent long-term shaking from causing greater damage to the slewing bearing.

Slewing bearing

Three, bearing shaking solution

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  1. Clean the bearing housing and replace with a new oil seal.

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  1. Install a protective dust cover and improve the oil seal.

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  1. Check the bearing box, adjust the support surface and adjust the gasket.

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  1. Detect the shaft diameter, select the appropriate amount of fit, and re-lock the adapter sleeve.

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  1. Replace the bearing housing with the hole diameter that meets the design requirements.

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  1. Readjust the shims so that the shaft centers are coupled on the same straight line.

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I believe that after reading the above content, you will know whether it is normal for the bearing to shake. The editor of Hengguan Bearing also introduces the reasons and solutions to the shaking. I hope it will help you. Of course, in addition to this, we Attention should be paid to the abnormal conditions encountered during the use of the bearing so as not to affect the normal use of the bearing.

Cold treatment process and role of bearing sleeve

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The cold treatment of the bearing sleeve mainly refers to a processing process after the bearing material after forging heat treatment, mainly by staying in an environment after the quenching is placed in an environment where the quench is restored for a period of time, this process is called cold treatment, and the following turntable Everyone introduces the role of the cold treatment of the bearing ring and related process.
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First, the effect of cold treatment Be Precision bearing is high in size stability; after the ferrule quenching (especially grading), the internal tissue still retains more residual austeel, which is unstable, in storage and use bearing In the process, it will continue to change, thereby changing the accuracy of the bearing. For this purpose, a cold treatment process is used, which reduces the residual bombs in the tissue and slightly improves the hardness of the part.
Tuto bearing
Second, cold treatment process and requirements
1. After quenching, stay at room temperature: After quenching, be sure to make cold treatment inside and outside the ferrule, otherwise it is easy to crack, cold to room temperature, cold treatment (generally no more than 30 minutes), otherwise it will stop the austenite The transformation of the hometown.

2, cold treatment temperature: The temperature of the cold treatment is mainly based on the martensite transition temperature MF of the steel, and the impact of cold treatment on mechanical properties and processability is considered. For GCR15 steel, cold treatment is used to use -70 ° C; when the accuracy requires less than a ferrule or device, the cold treatment temperature can be selected from -40 to -70 ° C; ultra-precision bearing, can be at -70 ° C ~ -80 ° C Cold treatment is carried out. Overcloowise temperature affects the bearing impact fatigue and contact life.

3, cold treatment insulation: Although the change in mass martensite is completed when it is cold to a certain temperature, but in order to make a batch of ferrule surfaces and the center of the center, there is a certain holding time, generally 1 to 1.5 h.

4, the cold treatment after cold treatment: After the ferrule is cold, placed in the air, and the temperature is slow to rise to the room temperature. Wenheng can’t be too fast, otherwise it is easy to crack; tempering time, otherwise the residual stress inside the ferrule can cause the ferrule crack, generally no more than 2 hours.

What is the working temperature of the slewing bearing?

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The slewing bearing is a very important part in the machine. Basically, every machine needs this part. Because this part is relatively fragile, it can also be regarded as a kind of consumables. You need to buy it frequently to keep the machine in good condition. normal operation. Let’s take a look at the working temperature of the slewing bearing.

The slewing bearing can work normally at -300C～+700C. If the user needs to adapt to the lower or higher temperature slewing bearing, our company can make special design. If the slewing bearing is used in particularly harsh environments, such as marine climate, dust or abrasive particles, sand, cement, coal powder, etc. Special sealing rings, protective devices, and suitable oil passages should be selected. Therefore, in order to make your support function normally, it is hoped to do a good job in daily maintenance and maintenance.

The tooth surface of the slewing bearing should be cleaned and changed every 8-10 working days, and foreign matter should not be mixed.

Features of slewing bearing materials

The slewing bearing is mainly composed of ferrules, rolling elements, cages, sealing rings, etc. Since different parts have special functions in practical applications, there are different considerations in the design and selection of materials.

In general, the rolling elements of the slewing ring are made of carbon-chromium bearing steel that is hardened as a whole. The slewing bearing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel. However, sometimes in order to meet the needs of the host in some special applications, other grades of surface can also be selected according to the specific use conditions provided by the user. Hardened steel, such as 42CrMo, 5CrMnMo, etc.

For small and medium slewing bearing forgings, round or square bars are used as blanks. The grain structure and mechanical properties of the bar are uniform and good, the shape and size are accurate, and the surface quality is good, which is convenient for mass production. As long as the heating temperature and deformation conditions are reasonably controlled, forgings with excellent performance can be forged without large forging deformation. Ingots are only used for large forgings. The ingot is an as-cast structure with large columnar crystals and a loose center. Therefore, through large plastic deformation, the columnar crystals must be broken into fine grains, and the loose compaction can be obtained in order to obtain excellent metal structure and mechanical properties.

The cages for slewing bearings have integral, segmented, spacer block and other structural forms. The integral and segmented cages are made of 20-gauge steel or ZL102 cast aluminum alloy. The spacer block type is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc. With the continuous development of the material industry, nylon GRPA66.25 has also been popularized and applied in the design of segmented cages.

The material of the slewing ring seal is made of oil-resistant nitrile rubber. The codes of the ferrule material and the supply status of the blank are as specified in the table. In the table, “T” means that the blank of the ring is supplied in a quenched and tempered state, and “Z” means that the blank of the ring is supplied in a normalized state.

The above is a complete introduction to the working temperature of the slewing bearing and the characteristics of the slewing bearing material. I hope it can be helpful to you. Our company produces customized slewing ring bearings, turntable bearings and other products. Hengguan Bearing strives for each set of slewing bearings. Support bearings, can make customers satisfied. Our aim is: to solve problems for customers, to create value, to be a valuable enterprise! Hengguan Bearings, intelligently create the future, only work hard for high-quality slewing ring bearings!

Who makes the slewing bearing for pelletizer the best in China

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Recently, Luoyang Hengguan Bearing Technology Co., Ltd. (hereinafter referred to as Hengguan Bearing), designed and manufactured for a large group company in Northeast China, the special slewing bearing for the 6-meter disc ball machine (ball-forming disc) has been successfully completed and passed the test of finished product. It has been sent to a third-party construction site for installation and trial operation.

The disc pelletizer refers to the equipment used to manufacture green balls in the pellet production process. Disc pelletizers are widely used in non-ferrous metallurgy, cement, steel, fertilizer and other industrial fields. In the process of application, the design of disc pelletizers has been continuously innovated and perfected, so that the disc pelletizers have reliable functions. , High-quality equipment with rigorous structure, excellent effect, less wear, low energy consumption and easy maintenance. The new disc pelletizing machine is mainly composed of disc body, transmission system, slewing bearing, rotary scraper device, disc body inclination adjustment device, lubrication system and other parts. This time, Hengguan Bearing mainly manufactures one component of the slewing ring bearing. Hengguan Bearing has produced 6-meter and 7.5-meter ball machine slewing ring bearings.

The slewing ring bearing of the 6-meter ball machine is designated by the owner of our company’s slewing ring bearing, and the ball machine manufacturer is entrusted to purchase it. Since the owner’s on-site ball machine has been shut down due to a problem with the slewing ring, a new set of slewing ring bearings is urgently needed for replacement, so as to resume normal operation as soon as possible. After receiving the order, our company immediately arranged the time to put materials into production; and made innovations and improvements based on the actual use of the old slewing ring bearings on site. Shipped smoothly within 25 days.

For the on-site problem (1) the slewing bearing is prone to jam and standstill during the operation; this phenomenon occurs because the ball machine is not running horizontally when it is in working state, but during the operation. It is caused by a certain angle of inclination; in the normal slewing bearing raceway, it is composed of rolling elements and spacer blocks; when all rolling elements are tilted and transported, due to the action of gravity, it will cause extrusion, jamming, standstill, etc. condition. Hengguan Bearing has innovatively improved the slewing bearing cage, so that each rolling element can keep rotating in place, so that this problem can be easily solved.

For on-site problems (2) the oil leakage of the raceway is serious when the slewing bearing is running; due to the inclined operation of the slewing bearing of the ball machine, the ordinary rubber sealing strip is not tightly sealed, and the raceway leaks under the action of gravity. The oil phenomenon is serious, which is not good for bearing lubrication. In response to this phenomenon, the engineers of Hengguan Bearing proposed to use a double-layer special seal, the internal use of the secret palace type wool seal, and the outer ring to be sealed with a steel plate by direct pressure; the on-site oil leakage phenomenon was properly solved.

There are always more solutions than difficulties. Hengguan Bearing, aiming at the actual use of slewing bearing, solves the problem; constantly emancipates the mind, enhances the sense of innovation, the spirit of innovation and the ability of innovation. Achieve innovation in work ideas, innovation in goals and tasks, and innovation in work measures. By innovating the working mechanism, constantly adapting to new situations, studying new situations, summarizing new experiences, exploring new laws, expanding their brainpower, and improving work quality and efficiency, Hengguan people strives for each set of slewing ring bearings that leave the factory to make customers satisfy. Our aim is: to solve problems for customers, to create value, to be a valuable enterprise! Hengguan Bearings, intelligently create the future, only work hard for high-quality slewing ring bearings!

Disassembly method of slewing bearing

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Bearings, as a kind of mechanical conventional parts, are unavoidable with the use of equipment, so when our equipment or machines are routinely repaired or damaged, we need to disassemble the bearings, especially when the bearings are disassembled for faults, check the parts around the bearings, lubricate them. The situation of the agent and the bearing itself can be more clearly known to the fault, then the following editor of Hengguan Bearing will introduce the disassembly method of the slewing bearing to you.
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1. Instructions before disassembling the slewing bearing
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1. Use of dismantling tools
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(1) Use manual or hydraulic
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(2) Only use a special wrench
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(3) Use a puller
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(4) Use induction heating equipment (inner ring)
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(5) Use oil injection method
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2. How to disassemble
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(1) It should be carried out by or under the guidance of experienced personnel;
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(2) Before starting the disassembly, determine the specific method to be disassembled;
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(3) Keep the necessary bearing removal tools handy;
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(4) When reusing or inspecting a disassembled bearing, be careful to avoid scratching or damaging the bearing raceway or rolling elements; when disassembling the bearing from the bearing seat, the disassembly force is applied to the outer ring; when disassembling the bearing from the shaft, the disassembly force is applied to the outer ring. inner circle;
Slewing bearing
Second, the disassembly method of the slewing bearing
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1. Cold disassembly
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When removing smaller bearings, the bearing ring can be removed from the shaft by lightly tapping the side of the bearing ring with a suitable punch, preferably with a mechanical puller. The pull should act on the inner ring or adjacent components. Removal can be simplified if the shaft shoulder and housing shoulder have grooves to accommodate the puller grip. In addition, some threaded holes are machined at the position of the hole shoulder to facilitate the bolt to push the bearing out.
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Large and medium-sized bearings often require more force than machine tools can provide. Therefore, the use of hydraulic power tools or oil injection, or both, is recommended. This means that oil holes and oil grooves need to be designed on the shaft.
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2. Hot disassembly
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When disassembling the inner ring of needle roller bearings or NU, NJ, and NUP cylindrical roller bearings, the hot disassembly method is suitable. Two commonly used heating tools: heating rings and adjustable induction heaters.
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The heating ring is usually used to install and remove the inner ring of small and medium-sized bearings of the same size. The heating ring is made of light alloy. Heating rings are radially slotted and equipped with electrically insulating handles.
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If the inner rings of different diameters are frequently disassembled, it is recommended to use a debuggable induction heater. These heaters quickly heat the inner ring without heating the shaft. When disassembling the inner ring of a large cylindrical roller bearing, some special stationary induction heaters can be used.
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3. Remove the bearing installed on the conical shaft diameter
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The small bearing can be removed by pulling the inner ring with a mechanical or hydraulic puller. Some pullers are equipped with spring-operated arms, and the use of this self-aligning design of the puller simplifies the procedure and avoids damage to the journal. If the puller claws cannot be used on the inner ring, the bearing should be disassembled through the outer ring or by using a puller combined with a puller.
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When using the oil injection method, the disassembly of medium and large bearings will be safer and easier. This method injects hydraulic oil between two conical mating surfaces under high pressure through oil holes and oil grooves. The friction between the two surfaces is drastically reduced and an axial force is created that separates the bearing and shaft diameter.
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4. Remove the bearing on the adapter sleeve
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For the small bearing installed on the adapter sleeve with the straight shaft, you can use a hammer to knock the small steel block that acts evenly on the end face of the inner ring of the bearing to remove it. Before doing this, the adapter sleeve lock nut needs to be loosened a few turns. For small bearings mounted on the stepped shaft of the adapter sleeve, it can be removed by hitting the small end face of the adapter sleeve lock nut with a hammer through a special sleeve. Before doing this, the adapter sleeve lock nut needs to be loosened a few turns. For bearings mounted on a stepped shaft with an adapter sleeve, the use of a hydraulic nut makes bearing removal easier. To do this, a suitable stop must be installed close to the hydraulic nut piston. Oil injection is the easier method, but an adapter sleeve with oil holes and oil grooves must be used.
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5. Remove the bearing on the withdrawal sleeve
When removing the bearing on the withdrawal sleeve, the locking device must be removed. (such as lock nuts, end plates, etc.) For small and medium-sized bearings, lock nuts, hook wrenches or impact wrenches can be used for disassembly.
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For medium and large bearings installed on the withdrawal sleeve, the hydraulic nut can be used to easily disassemble. It is recommended to install a stop behind the hydraulic nut on the shaft end. The stop device can prevent the withdrawal sleeve and the hydraulic nut from flying out of the shaft when the withdrawal sleeve is suddenly separated from the mating position.
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The above is the relevant content about the disassembly method of the slewing bearing. I hope it will be helpful to you. In addition, we have rich experience in the production of slewing bearings and slewing bearings. If you need it, please feel free to inquire