Why are linear guides better?
In the modern precision mechanical motion system, linear guide plays an extremely critical role, widely used in semiconductor manufacturing equipment, 3D printers, automatic testing equipment and all kinds of high-end automated production lines. Compared with other guiding devices to realize linear motion, linear guide has become the first choice for engineers and designers to build accurate and efficient mechanical systems due to its unique advantages. Next, we will analyze the excellence of linear guide compared to other guiding components, and discuss its core features and significant advantages.
What is a linear guide?
Linear guide is a device used to guide mechanical parts along a given linear direction for precise movement. It is mainly composed of two major parts: the guide rail and the slider, and the slider is installed with rolling bodies such as balls or rollers. When the slider moves along the guideway, the rolling body rolls between the guideway and the raceway of the slider, thus realizing smooth linear motion. This rolling friction way and the traditional sliding friction guide has the essential difference, greatly changed the characteristics of the movement.
Advantages of linear guide
1. Ultra-high motion accuracy
Linear guide can provide extremely high motion accuracy, thanks to its precision manufacturing process and the uniform distribution of rolling elements. Guideway and slider raceway after high-precision grinding, rolling body in the raceway running track accurate and controllable, so that the slider in the process of movement can maintain a very small straightness error and repetitive positioning error. In the semiconductor photolithography equipment that requires high precision, linear guide can ensure that the photolithography head moves under micron or even nano level precision to meet the needs of ultra-precision processing such as chip manufacturing.
2. Low friction, high speed
The rolling friction coefficient of linear guideway is much lower than that of traditional sliding guideway, which greatly reduces the movement resistance. This means that under the same driving force, the system using linear guide can realize higher movement speed. In automated sorting equipment, high-speed running slider with the help of linear guide can quickly and accurately sort goods to the designated location, greatly improving the sorting efficiency, and at the same time due to the friction is small, in the form of heat dissipation of energy is also less, the system energy consumption is lower.
3. High load-carrying capacity
linear guide has excellent high load-carrying capacity through the reasonable design of the number of rolling elements, size and raceway structure. Multiple rolling elements evenly share the load, so that the linear guide can withstand large radial force, axial force and tilting moment. In the large gantry machining centers, the worktable weighing several tons relies on linear guide to achieve smooth movement, complete the high-precision machining of large workpieces, fully demonstrating the excellent performance of linear guide in heavy-duty working conditions.
4. Long service life
The rolling body and raceway inside the linear guide are made of high-quality alloy steel material, and after special heat treatment process, it has extremely high hardness and wear resistance. Rolling friction reduces the wear and tear between components, under normal use and maintenance conditions, the service life of linear guide is much longer than ordinary sliding guide. This not only reduces the maintenance cost of the equipment, but also reduces the downtime caused by equipment maintenance and improves the continuity and stability of production.
The main characteristics of linear guide
1. Diverse guide rail cross-section shape
The guide rail cross-section shape of the linear guide is rich and diverse, common square, round, dovetail and so on. Different cross-section shapes are suitable for different application scenarios and load requirements. Square guide has a high degree of rigidity and stability, suitable for heavy loads and high precision requirements of the occasion; circular guide is commonly used in the space layout has special requirements, and the load is relatively small equipment; dovetail guide in some of the need to withstand a large tilting moment of the mechanical structure of the outstanding performance.
2. Different forms of slider
slider as the key moving parts of the linear guide, there are also a variety of forms to choose from. Common single slider, double slider and multi-slider combination. Single slider for smaller loads, movement is relatively simple; double slider or multi-slider combination can improve the system's carrying capacity and stability of the movement, especially for long travel, high load applications. In addition, the sealing form of the slider is also different, there are ordinary sealing and high dust sealing, etc., according to the degree of cleanliness of the environment to choose, to ensure that the rolling body and the raceway is not subject to dust, impurities, to extend the service life of the linear guide.
3. Differences in preloading
In order to further improve the accuracy and rigidity of linear guide, it is usually preloaded. Pre-tightening methods mainly include interference fit pre-tightening and elastic element pre-tightening. Preload through precise control of the guide and the slider with the tolerance, so that the rolling body in the raceway to produce a certain amount of pre-pressure, effectively eliminating the gap, improve the rigidity and precision of the system, but the installation is relatively difficult; elastic element preload is the use of springs and other elastic components
Translated with DeepL.com (free version)
