Linear guides are one of the important components used in mechanical equipment. They have the function of enabling mechanical equipment to move with high precision. Their precision requirements are very high. So how to ensure the installation accuracy of bearing linear guides? Let's take a look.
1. Factors Affecting Precision
The assembly accuracy requirements of linear guides depend on the specific application scenarios. Position error, verticality error, and parallelism error are important factors affecting the performance and accuracy of the guides.
1.1 Position Error
Position error refers to the offset of the slider moving on the guide relative to the axis of the guide, which is an important parameter for the assembly accuracy of bearing linear guides. For some high-precision machining and automation systems, the position error is generally required to be between 0.01-0.05mm, while the requirements of some high-speed equipment are more stringent.
1.2 Requirements for Verticality of Bearing Linear Guides
Verticality refers to the verticality of the guide rail, that is, the deviation between the guide rail and the mounting surface in a vertical plane. For most industry applications, the verticality requirement is between 0.02-0.05mm/m. For some special industries, such as semiconductor manufacturing, the verticality error is required to be smaller.
1.3 Parallelism Requirements for Linear Guides
Parallelism refers to the deviation between the direction of the slider travel and the axis of the bearing linear guide when the slider moves on the guide rail. For general machining and automation systems, the parallelism error requirement is between 0.02-0.08mm/m. In some high-precision machining and automation systems, the parallelism error requirement is higher.
2. The Importance of Bearing Linear Guide Installation Accuracy
The installation accuracy of the guide rail directly affects the motion trajectory of the slider or other moving parts, and then affects the size and shape accuracy of the workpiece.
High-precision guide rail installation can reduce positioning errors, verticality errors and parallelism errors, thereby improving the motion accuracy of the overall system.
3. How to Reduce Accuracy Errors?
3.1 Preparation
Clean the working surface: Before installation, remove oil, dust or debris on the surface of the guide rail to ensure that the guide rail installation surface is clean and dust-free to avoid affecting the installation accuracy.
Check the bearing linear guide and slider: Before installation, check the appearance of the ball linear guide and slider to see if there is bending straightness, corrosion, burrs, etc.
3.2 Use the Right Tools
Precision measuring tools: Use precision measuring tools such as level, ruler, micrometer, laser detector, etc. to check the straightness and accuracy of the mounting surface. The mounting surface flatness is 0.02mm and it is complete without sections.
Torque wrench: When fixing the rail, use a torque wrench to ensure that the tightening torque of the bolts meets the manufacturer's specifications.
3.3 Installation Steps
Fix one end first: When installing the bearing linear guide, fix one end first, and then use the measuring tool to check the horizontality and verticality of the rail.
Gradually adjust: Before fixing the other end, gradually adjust the position of the rail to ensure that it is parallel to the reference surface.
Evenly tighten: When fixing the rail, tighten all bolts evenly to avoid deformation of the rail due to uneven pressure.
3.4 Check the Alignment of the Rail
Use a ruler or laser level: After installation, use a ruler or laser level to check the alignment of the bearing linear guide to ensure that it is on the same plane.
Slider movement test: After installation, manually move the slider to check whether it moves smoothly and whether there is any jamming or abnormal noise.
3.5 Perform Precision Tests
Measure the straightness of the guide rail: Use precision measuring tools to measure the straightness of the bearing linear guide to ensure that it is within the specified tolerance range.
Load test: Before actual use, perform a load test to check the performance of the guide rail under load to ensure its stability and accuracy.
3.6 Regular Maintenance and Inspection
Regular inspection: Regularly check the installation status of the guide rail to ensure that there is no looseness or deformation.
Lubrication maintenance: Maintain the lubrication status of the guide rail and add lubricant regularly to reduce wear and maintain motion accuracy.
Summary
The installation accuracy of the bearing linear guide rail not only affects the performance and service life of the equipment, but also affects production efficiency, safety and maintenance costs. Therefore, in the design, manufacturing and installation of the equipment, it is necessary to pay attention to the installation accuracy of the guide rail to ensure the overall performance and reliability of the system.
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