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Performance and structural characteristics of thk circular guide rails

Publish Time：

2022-01-31

Most people are familiar with THK cylindrical linear guides, but few fully understand them. Today, we will explain THK cylindrical linear guides through their precision and structure.

(1) Guiding Precision: Guiding precision refers to the accuracy with which a moving component performs linear motion in a given direction. It mainly depends on the geometric precision of the THK cylindrical linear guide itself and the clearance of the THK cylindrical linear guide mating. The geometric precision of the THK cylindrical linear guide generally includes: straightness in the vertical and horizontal planes; parallelism between the two surfaces of the THK cylindrical linear guide. The geometric precision value of the THK cylindrical linear guide can be expressed as the error over the entire length of the THK cylindrical linear guide or the error per unit length.

(2) Precision Retention: Precision retention refers to the ability of a THK cylindrical linear guide to maintain its original geometric precision during operation. The precision retention of a THK cylindrical linear guide is mainly determined by its wear resistance. Wear resistance mainly depends on factors such as the materials and matching of the THK cylindrical linear guide pair, the load conditions, the precision, the lubrication method, and the performance of the protective device.

(3) Motion Precision: Includes smooth low-speed motion, no creeping, and accurate positioning. It is related to the structure and lubrication of the THK cylindrical linear guide, the difference in static and dynamic friction coefficients, and the stiffness of the transmission system.

(4) Sufficient Rigidity: Under load, the deformation of the THK cylindrical linear guide should not exceed the allowable value. Insufficient rigidity will not only reduce the guiding precision but also accelerate the wear of the THK cylindrical linear guide surface. Rigidity is mainly related to the type, size, and material of the THK cylindrical linear guide.

(5) Good Structural Processability: The structure of the THK cylindrical linear guide should be simple, easy to manufacture, inspect, and adjust, thereby reducing costs.

(6) Good Lubrication and Protection: Due to the different precisions of various machines and the different uses of THK cylindrical linear guides, the design should focus on the requirements for the THK cylindrical linear guides of the designed machines, emphasizing some aspects while considering them comprehensively.

Thank you, guide rail, precision, structure, geometry, stiffness, maintain, and guide

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