132018-08
What is a thin-walled bearing?
Spherical ball bearings are bearings whose inner and outer diameter ratios are less than a specified value. The ratio of the outer diameter of the bearing to the inner diameter of the bearing is 1.25 or less, which is called a thin-walled ball bearing. This means that the outer diameter-inner diameter of the bearing is small and the bearing wall is very thin, so it is called a thin-walled ball bearing. The precision required for thin-walled ball bearings is very high. Because the walls are very thin, the weight they can carry is also very low, and the impact resistance is very poor, so it is necessary to choose according to the use environment! ! The thin-walled ball bearing has a simple structure and is convenient to use. It is mainly used to bear radial load, but when it increases the radial clearance of the bearing, it has certain angular contact ball bearing performance and can withstand combined radial and axial loads. It can also be used to withstand pure axial loads when the rotational speed is high and thrust ball bearings are not suitable. Compared with other types of bearings of the same size, such bearings have a small coefficient of friction and a high limit speed. However, it is not resistant to impact and is not suitable for heavy loads. Widely used in aircraft, aerospace, astronomical instruments and clamping equipment, food processing equipment, glass production equipment and rotary workbench, machine tools, packaging equipment, medical equipment, optical scanning equipment, radar, satellite communication equipment, textile machinery, robots and Semiconductor manufacturing equipment and other industries.
132018-08
What is an equal section thin-walled bearing
A thin-walled bearing of equal section means that the bearing is equal in size in both the radial and axial sections and is relatively thin in size, whereas the two dimensions of the normal bearing are not equal, so they are individually classified as one. It is called a thin-walled bearing of equal section and is mainly used in applications where the size limitation requires a very small cross-section of the bearing.
132018-08
How to store the bearings to better extend the bearing life?
Custody Bearings are factory-coated with an appropriate amount of rust preventive oil and packaged in rust-proof paper. As long as the package is not damaged, the quality of the bearing will be guaranteed. However, when stored for a long time, it is recommended to store it on a shelf 30cm above the ground under the conditions of humidity below 65% and temperature around 20°C. In addition, the storage place should avoid direct sunlight or touch the cold wall. Bearing Packaging After the packaging and the outer packaging bearing are manufactured and tested, they are cleaned and rust-proofed, and then placed in the inner packaging to achieve Waterproof, moisture-proof, dust-proof, anti-shock, maintain the quality and precision of the bearing and the purpose of convenient use and sale. The inner packaging of the bearing is divided into three categories according to the anti-rust period: 1 short anti-rust period packaging: anti-rust period 3 to 6 months, suitable for large-scale delivery to the same Subscribers, bearings that are put into use in the short term. According to the agreement between the two parties, the principle of convenient use is adopted, and simple packaging is adopted. 2 General anti-rust period Packing: One year anti-rust, suitable for general purpose bearings. 3 long anti-rust period packaging: anti-rust period of two years, suitable for special and precision bearings. The inner packaging material of the bearing is made of polyethylene plastic tube (box), kraft paper, plain and crepe polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic fastening. Belt, waterproof high-strength plastic belt, linen bag, etc. All of the above materials are required to ensure that the corrosion resistance test of the material is qualified.
132018-08
Equal section thin wall ball bearing
Custody Bearings are factory-coated with an appropriate amount of rust preventive oil and packaged in rust-proof paper. As long as the package is not damaged, the quality of the bearing will be guaranteed. However, when stored for a long time, it is recommended to store it on a shelf 30cm above the ground under the conditions of humidity below 65% and temperature around 20°C. In addition, the storage place should avoid direct sunlight or touch the cold wall. Bearing Packaging After the packaging and the outer packaging bearing are manufactured and tested, they are cleaned and rust-proofed, and then placed in the inner packaging to achieve Waterproof, moisture-proof, dust-proof, anti-shock, maintain the quality and precision of the bearing and the purpose of convenient use and sale. The inner packaging of the bearing is divided into three categories according to the anti-rust period: 1 short anti-rust period packaging: anti-rust period 3 to 6 months, suitable for large-scale delivery to the same Subscribers, bearings that are put into use in the short term. According to the agreement between the two parties, the principle of convenient use is adopted, and simple packaging is adopted. 2 General anti-rust period Packing: One year anti-rust, suitable for general purpose bearings. 3 long anti-rust period packaging: anti-rust period of two years, suitable for special and precision bearings. The inner packaging material of the bearing is made of polyethylene plastic tube (box), kraft paper, plain and crepe polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic fastening. Belt, waterproof high-strength plastic belt, linen bag, etc. All of the above materials are required to ensure that the corrosion resistance test of the material is qualified.
132018-08
Summer bearing maintenance
1. First, put the bearing into the gasoline to clean, wipe off the sludge and dust left on the bearing, and all the rusted bearings are gently wiped with metallographic sandpaper until there is no rough feeling by hand. . 2. Dry the cleaned bearing with a dry rag and place it in anti-rust oil. In this process, the bearing should be completely in contact with the rust preventive oil, and the bearing should not be rotated, so that the oil film formed by the rust preventive oil can be covered on the surface of the bearing to achieve the purpose of rust prevention. 3, next use anti-rust oil, butter, need to be evenly applied to the surface of the bearing, including the inner and outer rings, steel balls, cages. Moreover, the bearing is rotated while being smeared, so that the rust preventive oil actually enters the inside of the bearing and fully lubricates.
132018-08
(LRZ) bearing correct derusting method
First, anti-rust method Surface pretreatment method for anti-rust: 1) Surface cleaning: Cleaning must be based on the nature of the surface of the anti-rust and the current Conditions, select the appropriate method. Commonly used are solvent cleaning, chemical cleaning and mechanical cleaning. 2) Dry and clean the surface, dry it with filtered dry compressed air, or dry it with a dryer at 120~170 °C, or dry it with clean gauze. Method for applying anti-rust oil 1) Soaking method: some small LRZ bearings are immersed in anti-rust grease, so that the surface is adhered with a layer of anti-rust grease. method. The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease. 2) Brushing method is used for outdoor construction equipment or special shape products that are not suitable for soaking or spraying. When painting, it is necessary to pay attention not to accumulate, but also to prevent leakage coating. 3) Spraying Some large rust preventives cannot be applied by immersion method. Generally, the compressed air is filtered at a pressure of about 0.7mpa in an air cleaning place. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but it must adopt perfect fire and labor protection measures. The installation of the LRZ bearing is correct, affecting accuracy, life and performance. Therefore, the design and assembly department should fully study the installation of LRZ bearings. I hope to install according to the operating standards. The standard of the operation standard is usually as follows: (1), cleaning LRZ bearing and LRZ bearing related parts (2), checking the size and finishing of related parts (3), installation (4), inspection after installing LRZ bearing (5), supply lubricant The LRZ bearing package is only opened before installation. Generally grease is lubricated, not cleaned, and directly filled with grease. The lubricating oil is lubricated and does not need to be cleaned normally. However, for instrument or high-speed LRZ bearings, it should be cleaned with clean oil to remove the rust inhibitor applied to the LRZ bearing. The LRZ bearing with the rust preventive removed is easy to rust, so it cannot be placed. Furthermore, LRZ bearings that have been sealed with grease are used without cleaning. The installation method of LRZ bearing varies with LRZ bearing structure, fit, and condition. Generally, since the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore LRZ bearings, press with a press, or use a hot charging method. For taper holes, mount directly on the taper shaft or with a sleeve. When mounting to the outer casing, there is usually a lot of clearance and the outer ring has an interference. It is usually pressed by a press or there is a cold shrink fit method after cooling. With dry ice as the coolant and cold shrink fit, the moisture in the air will condense on the surface of the LRZ bearing. Therefore, appropriate rust prevention measures are required.
132018-08
Development of industrial robot bearings
China's bearing industry ranks fourth in the world after Japan, the United States and Germany. However, compared with the world's bearing industry, China's bearing industry still has a large gap, mainly characterized by high precision, high technology content and low proportion of high-added products, poor product stability, low reliability and short life. Industrial robot bearings are mainly used in industrial robot bearings and are one of the key components of industrial robots. There are two main categories: one is a thin-walled bearing with equal section, and the other is a crossed cylindrical roller bearing. There are also harmonic reducer bearings, linear bearings, joint bearings, etc., but mainly the first two bearings. First notice the type of joint of the robot and then decide which bearing to use. For example, the rotational accuracy and stiffness of the lumbar bearings are very high; the ends of the robot, such as the elbows and wrists, are critical in terms of compact size, light weight and good adaptability to harsh environments. Like most robots, the design of the robot's bearings must take into account a certain load capacity, speed capability, service life, such as mechanical properties and environmental requirements such as rotational accuracy and geometric dimensions. For example, the size of the radius of curvature of the inner and outer ring channels directly affects the bearing capacity, life, rigidity and friction torque.
132018-08
How to correctly understand the limit speed of the bearing
The ultimate speed of the bearing is the maximum speed that can be achieved when the bearing is running. It depends mainly on the relationship between the heat generated by the friction during the running of the bearing and the heat discharged, and the bearing material, structural dimensions, clearance, load, The material and structure of the cage and the guiding method, the lubrication method, the amount of lubricant, and the cooling condition of the bearing are closely related. In general, the limit speed of a single set of bearing grease lubrication and oil lubrication is given in the bearing sample. The applicable conditions are: standard structure, normal grade accuracy, and opening of the basic group clearance. Bearing; sufficient lubrication condition; equivalent dynamic load is less than 10% of bearing dynamic load; at 20 °C ambient temperature, bearing temperature rise is 50 °C; radial bearing only bears radial load, thrust bearing only bears axial load . If the actual operating conditions are different from the applicable conditions above, the actual maximum operating speed will be lower than the reference limit speed value given in the sample. The limit speed of double or triple bearings can generally reach 60%-80% of single bearing. Increasing the bearing accuracy and appropriately increasing the bearing clearance can increase the limit speed of the bearing to a certain extent, but the specific increase is difficult to quantify; the cage is made of lightweight material or the cage with special structure is designed. More efficient lubrication can greatly increase the limit speed of the bearing, up to 3 to 4 times the limit speed given by the sample.
132018-08
Is the radial clearance of the bearing as small as possible?
Not all bearings require a minimum working clearance and you must select the appropriate clearance depending on the conditions. In GB 4604-93, the radial clearance of the rolling bearing is divided into five groups - 2 groups < 0 group < 3 groups < 4 groups < 5 groups, wherein 0 group is the standard clearance. The basic radial clearance group is suitable for general operating conditions, conventional temperature and common interference fit. 1. Bearings operating under special conditions such as high temperature, high speed, low noise and low friction should use large radial clearance. 2, for the precision spindle, machine tool spindle bearings, etc. should choose a small radial clearance; 3, for roller bearings can maintain a small amount of working clearance. In addition, there is no play for the separate type of bearing; finally, the working clearance after the bearing is installed is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and The amount of elastic deformation produced by the bearing fit and load.
132018-08
Thin-walled crossed roller bearing
CRA series thin-walled cross-roller bearings (outer ring split type) are small and lightweight cross-roller bearings that make the outer ring and inner ring wall thickness very thin. They are small enough to withstand heavy loads. Therefore, the mounting position of the bearing on the equipment can be lightened.. The inner and outer rings of the CRB series thin-walled cross-roller bearing (outer ring split type) are miniaturized to the maximum extent, and the structure is the outer ring. It is a two-section part, and the inner ring is an integrated structure, which is most suitable for places where the inner ring rotation precision is required.. CRE series thin-walled cross roller bearing (inner ring division type) structure The inner ring is two divided parts, and the outer ring is an integral structural form, which is most suitable for a place where the outer ring rotation precision is required.
132018-08
The effect of sealing device on thin-walled bearings
There are corresponding sealing devices installed on both ends of the bearing, but many people do not know what the sealing device does. Let's take a look at what the sealing device does for thin-walled bearings. 1. Keep the grease (oil) inside the bearing from escaping during use, and ensure that the bearing is in a lubricated state. 2. Protect the dust or harmful gases from the bearing from entering the bearing cavity. Damage to the bearing. The sealing structure of the seal is varied, so the sealing effect is different. There is a gap between the sealing ring and the rotating shaft, which is called non-contact sealing. The smaller the clearance is, the better the sealing effect is, but the smaller the rotation speed of the shaft is allowed; the opposite is the opposite. There is no gap between the seal ring and the rotating shaft, which is called contact seal. The contact area of the contact lip of the seal ring is larger, the better the sealing effect is, but the smaller the rotation speed of the shaft is allowed, the opposite is the opposite. The main research content of the sealing technology is to research and develop the corresponding sealing device applied under different working conditions, and the compatibility of the sealing ring material with the corresponding grease.
132018-08
Advantages of Luoyang Larry Thin Wall Bearing
Thin-wall bearing Luoyang Lirui Bearing Co., Ltd. Features of thin-walled bearings: The thin-walled bearing has a very thin bearing cross section, and has also achieved miniaturization and weight reduction. The diversity of products extends the range of applications. 0379-64907522 In order to obtain low friction torque, high rigidity and good rotation accuracy of the bearing, a steel ball with a small outer light is used. The use of a hollow shaft ensures space for wiring and wiring. The thin-walled bearing realizes an extremely thin bearing end face, and also realizes miniaturization and weight reduction of the product. The diversity of products extends the range of applications. Luoyang Lirui Bearing Co., Ltd. Thin-walled ferrule bearings are: deep groove ball bearings (C), four-point contact ball bearings (X) Angular contact ball bearings (A), These various designs are available in different series. The series depends on the size of the cross section. The ball matches the series. Deep groove ball bearings can support both axial and radial loads. Four-point contact ball bearings can support the main structural form of two-way thin-walled bearings. Ultra-thin wall bearings are widely used in aircraft, aerospace, astronomical instruments and clamping equipment, food processing equipment, glass production equipment and rotary tables, machine tools, packaging equipment, medical equipment, optical scanning equipment, radar, satellite communication equipment, textile Machinery, robotics, and semiconductor manufacturing equipment.
