1. Materials used for linear guides
1. Many linear guide materials use chromium bearing steel, common such as GCr15, and carburized bearing steel, such as G20CrMo, can also be considered. The structural design should pay attention to the quenching process requirements, otherwise there will be cracks and deformation.
2, linear slider can be divided into: roller linear guide, cylindrical linear guide, ball linear guide, three types, which are used to support and guide the moving parts, and perform reciprocating linear motion in a given direction. Depending on the nature of the conflict, linear motion guides can be divided into sliding conflict guides, rolling conflict guides, elastic conflict guides, and fluid conflict guides. Linear guides, ball screws, grinding racks, guides
Second, the classification of linear guides
1. The linear guide pair is generally composed of guide rails, sliders, reversers, rolling bodies and sticks. It is a new type of rolling support for relative reciprocating linear motion, which can roll with the steel ball between the slider and the guide rail. To replace the direct sliding touch, and the tumbling body can complete an infinite loop in the raceway and the slider with the help of a reverser. It has a simple structure,
2. The advantages of small dynamic and static conflict coefficient, high positioning accuracy, and good accuracy persistence. Linear guides, also known as fine rolling linear guides, slide rails, linear guides, linear slides, and rolling guides, are used in linear reciprocating applications that require accurate control of the parallelism of the worktable. They have a higher rated load than linear bearings. It can bear a certain torque and complete high-precision linear motion under high load.
3. The function of the linear guide is to support and guide the moving parts. Relying on the two or four rows of balls on both sides of the guide, the cyclical rolling of the two or four rows of balls drives the worktable to move smoothly in a given direction for reciprocating linear motion. Depending on the nature of the conflict, linear motion guides can be divided into sliding conflict guides, rolling conflict guides, elastic conflict guides, fluid conflict guides and other varieties.
Third, the accuracy of the linear guide
1. The accuracy grades of linear guide rails are divided into (walking parallelism, the following takes the guide rail 100mm length as an example), general grade (no mark/C) 5μm, (H) 3μm, precision grade (P) 2μm, precision grade (SP) 1.5 μm, precision level (UP) 1μm depends on the use of different machines. Give the slider preload. Generally, pre-compression is divided into pre-compression without pre-compression and heavy pre-compression. The greater the preload, the better the rigidity. Load: Generally, at the beginning of the selection, it is concluded that 1/3 of the rated dynamic load is the upper limit of the practical load. Therefore, it is generally added to the medium preload to ensure that there is no sinking. If the guide rail is used up and down, the guide rail has a directing effect. How much the sliding block rises is related to the used lead screw or other transmission methods, and has nothing to do with the sliding rail and the sliding block.
2. There are basically three types of different brands. Generally, gaps, light preloading, and medium preloading gaps can affect the walking accuracy, load bearing capacity and rigidity of the guide rail. In addition, the selection of guide rails with gaps can reduce the vibration and impact caused by reciprocating motion to a certain extent.
3. When loading, the slider will not sink much. It should be said that there will be elastic deformation. If you want to say how much, any guide rail material is not marked now, because it can be neglected.
Fourth, the difference between linear guide and linear bearing
1. In terms of equipment: linear guides have higher precision than linear bearings, with greater load and greater stability.
2. In terms of cost: the same brand, linear guides are more expensive than linear bearings (domestic imitations are not counted).
3. From the market: linear guides have a wider range of applications than linear bearings, and linear bearings are relatively only suitable for preliminary processing.
