[Plastic linear bearings] Don't understand? The following will help you answer your doubts!
Characteristics of linear bearings:
Linear bearings have the advantages of low friction and high stability. They are used on almost all machines and are a widely used component.
Linear bearings are mainly used in automated machinery, such as machine tools, paper bowl machines, laser welding machines imported from Germany. Of course, linear bearings and linear shafts are used together. Like linear guides, they are mainly used in mechanical structures with high accuracy requirements.
However, the knowledge of linear bearings is relatively professional, and many purchasers may have some knowledge of linear bearings, such as tolerance levels and how to store technical details. The following series of plastic linear bearings will introduce some related knowledge of linear bearings to help you understand the products and parameters when purchasing or usually contacting linear bearings ~
What is a linear bearing?
Linear bearings are a linear motion system used for linear travel and are used in conjunction with cylindrical shafts.
Due to the point contact between the bearing ball and the bearing shell, the steel ball rolls with minimal frictional resistance, so the linear bearing has the characteristics of low friction, relatively stable, and does not change with the speed of the bearing, and can obtain a stable linear motion with high sensitivity and high accuracy.
Linear bearings also have their limitations. The most important thing is that the bearing's impact load capacity is poor, and the bearing capacity is also poor. Secondly, linear bearings have greater vibration and noise during high-speed motion.
Linear bearings are widely used. They are commonly used in precision equipment such as tensile testing machines and digital three-dimensional coordinate measuring equipment. They are used in industrial machinery such as multi-axis machine tools, punches, tool grinders, automatic gas cutting machines, printers, card sorters, and food packaging machines. It also has a wide range of applications.
Tolerance class of plastic linear bearings?
The tolerance level of linear bearings is also the accuracy level, which is generally divided into 0, 6, 6X, 5, 4, and 2 levels, and the tolerance level is from low to high.
Each tolerance level linear bearing has different requirements in size, rotation and appearance quality. The higher the level, the stricter the requirements and the more perfect the product performance. The price of the product will be higher. (Old tolerance grade codes are G, E, Ex, D, C, B).
The clearance in the linear bearing is to ensure that the linear bearing can run flexibly and without blocking, and at the same time, it is required to ensure that the linear bearing runs smoothly.
The accuracy grade of linear bearings is not directly related to the clearance of linear bearings. Radial clearance of radial linear bearings is generally divided into C2, C0, C3, C4, and C5 groups. The value range of the clearance is from small to large.
In theory, each group of linear bearing tolerances can choose each group of clearance, but the choice of clearance group must be based on specific working conditions, temperature, load and linear bearing configuration In order to achieve the various precision functions of linear bearings.
▲ THK linear bearing structure
For example, the lower the accuracy level of the product, the larger the clearance group can be selected, and the more accurate the product, the smaller the clearance or even the negative clearance.
How to store plastic linear bearings?
1. Requirements before storage
It is important to check that the outer packaging is intact before storing linear bearings. If the bearing is damaged before being stored, even if the storage conditions are good, problems will occur and the quality of linear bearings will be affected. Once the outsourcing is found to be incomplete, it should be repacked immediately.
2. Requirements for storage location
Bearings are generally placed in the warehouse, but the relative humidity in the warehouse should not exceed 60%, and the room temperature should be about 25 degrees, and the temperature difference should not be too large. And it is better not to put acid, alkali, salt and other corrosive things, chemical raw materials and large water in the warehouse. The storage location should be protected from direct sunlight, good ventilation and a clean environment.
3, storage method requirements
Different linear bearing products have different storage methods, and the wrong way will adversely affect the bearing. Small bearings are best placed on a shelf about 30cm from the ground. Large rolling bearings cannot be placed in a vertical position. Due to uneven forces, the bearings will be permanently deformed, so they should be stored in a horizontal position.
Plastic linear bearings for you to simply organize the introduction, I hope to help you!