HL elastic pin coupling inspection accuracy and rigidity hardenability

　　The rigid hardenability of HL type elastic pin coupling improves the strength and tempering stability of steel, and has excellent mechanical properties.Cr steel should be used for workpieces with large cross-sectional dimensions or important quenched and tempered workpieces.But Cr steel has similar temper brittleness.From the perspective of foreign development trends, in order to improve production efficiency, the new generation of CNC machine tools are developing in the direction of ultra-high speed, adopting new functional components (electric spindle, linear motor, etc.) to achieve ultra-high-speed processing. HL-type elastic pin couplings need to make some marks on the coordinated positions of the various parts of the coupling for reference during reassembly.For Lingsi couplings used in high-speed machines, the connecting bolts have been weighed and clearly marked and cannot be mistaken.When removing the coupling, the connecting bolt is usually removed first.Because a layer of grease, corrosion products and other deposits are deposited on the surface of the thread, the bolt is not easy to disassemble, especially for the heavily corroded bolt, it is very difficult to disassemble.
　　Check the dimensional accuracy of the HL elastic pin coupling according to the drawings, process and technical conditions.Generally, check the shape dimensions first, such as the shape, hole, shaft diameter, and then check the positioning dimensions, such as margins, center distances, etc.When inspecting parts with complex shapes and various sizes, a table should be drawn before the inspection, and the shape size should be listed in the table first, and then the positioning size should be listed in the table, and then measure according to the order of the table, and write the measurement results In the actual measured size column, so that the size will not be missed, and the inspection quality can be guaranteed.The initially selected coupling size, that is, the shaft hole diameter d and the shaft hole length L, should meet the requirements of the main and driven end shaft diameters, otherwise the coupling specifications must be adjusted according to the shaft diameter d.It is a common phenomenon that the shaft diameters of the main and driven ends are different. When the torque and speed are the same, and the shaft diameters of the main and driven ends are different, the coupling model should be selected according to the larger shaft diameter.In the newly designed transmission system, the seven shaft hole types specified in GB/T3852 should be selected, and the J1 shaft hole type is recommended to improve versatility and interchangeability. The length of the shaft hole is in accordance with the coupling product standard. . The choice of the connection type of the HL elastic pin coupling depends on the connection type of the main and driven ends and the shaft. Generally, the key connection is adopted, which is a unified key connection type and code. Seven keyway types are specified in GB/T3852 , Four types of keyless connection, the most used is the A-type key (flat key single keyway).
　　Removal of connecting bolts Choose suitable tools, because the bearing surface of the bolt's outer hexagon or inner hexagon has been slipped and damaged, and it will be difficult to disassemble.For bolts that have been rusted or have a lot of grease, solvents (such as rust loosening agent) are often used to spray the joints of the bolts and nuts to allow the solvent to penetrate into the threads, which will make it easy to disassemble the rigid coupling.