The structural positioning of the linear guide mainly includes a slide rail, a slider, a return cover, a return ring, etc. The positioning structure is a positioning bolt integrally formed with the return ring, and is set on the return cover, and has the function of the embedded column, and the positioning bolt is just right. The positioning screw hole matched with the end face of the slider provides a good combination of the slider and the return cover and the return ring, and also makes the related component easy to process, quick assembly, and allows the steel ball to flow stably and smoothly in the circulation flow channel. Increase the stability of the slider movement in the slide rail.
1, ball guide
The guide rail uses the ball as the rolling element, which has good motion sensitivity and high positioning degree; however, its bearing capacity and rigidity are small, and it is generally required to improve the bearing capacity and rigidity by pre-tightening. In order to avoid the loss of precision by pressing the pits on the guide rails, the guide rail faces are generally made of hardened steel. The ball guide is suitable for CNC machine tools with small moving parts and small cutting force.
2, roller guide
The bearing capacity and rigidity of the guide rail are larger than those of the ball guide, but the requirements for installation are also high. Poor installation can cause offset and lateral sliding, which will accelerate the wear of the guide rail and reduce the accuracy. At present, CNC machine tools, especially those with large loads, usually use roller guides.
3, needle roller guide
The needle roller of the needle guide is longer than the roller of the same diameter. The needle roller guide is characterized by its small size and compact structure. In order to improve the movement accuracy of the table, the size of the needle should be grouped by diameter. The needle guide is suitable for use on machines with limited rail sizes.
Two through-holes are arranged on both sides of the two end faces of the slider, and the through-holes on both sides of the two end faces are oppositely facing through the slider, and between the two through-holes on both sides, the end face of the guide rail is provided with The positioning screw hole of the fitting body is provided with a workpiece screw hole for fixing the working object on the top end surface of the slider; a returning cover is disposed on each end surface of the slider, and an arc returning groove is arranged at the end surface of the returning cover corresponding to the through hole And between the two return grooves on both sides, the return cover is provided with a positioning bolt and a positioning hole.
The two recirculation grooves on both sides of the end face of the reflow cover are respectively provided with a recirculation ring, and the end face of the recirculation ring is provided with a positioning hole, so that the recirculation groove and the recirculation ring form a circulation hole, and the two ends of the circulation hole respectively correspond to the sliding The through hole and the sliding rail of the block; the positioning hole set of the returning ring is sleeved on the returning sleeve positioning bolt, and has a column and a positioning function, and the positioning bolt and the positioning hole on the return cover are used to fit the positioning of the slider end face fitting function. Screw hole.