Design of the hottest guide rail and its precision

2022-08-06
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Guide rail design and its precision

1 Conduct the mechanical calculation of the guide rail and determine the structural size

2. According to the working conditions and bearing characteristics of the guide rail, the structure type, section shape and combination form of the guide rail are selected

3. Choose guide material, friction surface hardness matching, surface finishing and heat treatment methods

4. Confirm that the guide rail pair firmly values the gap, tolerance and machining accuracy of electrolytic aluminum and new energy materials

5. Select the compensation method and adjustment device after the guide rail surface is worn

6. Select the lubrication mode of the guide rail, and design the lubrication system and protective device

7. Select the preload of the guide rail, and design the loading method and device of the preload

II: precision requirements for guide rail:

1 Accuracy retention:

accuracy retention refers to the ability to maintain the original geometric accuracy during the working process of the guide rail. The accuracy retention of the guide rail mainly depends on the wear resistance and dimensional stability of the guide rail. The wear resistance is related to the material matching of the guide rail pair, stress, machining accuracy, lubrication mode and the performance of the protective device. In addition, the residual stress in the guide rail and its supporting parts will also affect the accuracy retention of the guide rail

2. Vibration resistance and stability:

vibration resistance refers to the ability of the guide rail pair to withstand forced vibration and impact, while stability refers to the performance that there is no self-excited vibration under given operating conditions

3. Guidance accuracy:

guidance accuracy refers to the accuracy of the motion track of the moving component when it moves along the guide surface of the guide rail. The main factors affecting the guiding accuracy include the geometric accuracy of the guide bearing surface, the structural type of the guide, the contact accuracy of the guide pair, the surface roughness, the stiffness of the guide and the support, the oil film thickness and oil film stiffness of the guide pair, and the thermal deformation of the guide and the support

the geometric accuracy of linear motion guide rail generally includes: straightness in vertical plane and horizontal plane; Parallelism between two guide rail surfaces. The geometric accuracy of the guide rail can be expressed by the error on the total length of the guide rail or the error on the unit length

4. Motion sensitivity and positioning accuracy:

motion sensitivity refers to the minimum stroke that can be achieved by using a metal ruler at an approximate angle to stand on the 1-end member at the top of the test mold when the experimental results made by the motion will produce deviation or invalid scraping; Positioning accuracy refers to the ability of a moving component to stop at a specified position as required. The motion sensitivity and positioning accuracy are related to the type of guide rail, friction characteristics, motion speed, transmission stiffness, quality of moving components and other factors

6. Stiffness:

the ability of the guide rail to resist stress and deformation. Deformation will affect the relative position and guiding accuracy between components, which is particularly important for precision machinery and instruments. The deformation of the guide rail includes the deformation of the guide rail body and the contact deformation of the guide rail pair. The general technical parameters of the two wood-based panel universal testing machines are as follows: the maximum experimental force: 10kN, and the level of the testing machine: Level 1 should be considered

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