When the working parts of the machine tool using miniature linear guides move, the steel balls circulate in the grooves of the bracket, and the wear of the bracket is distributed to each steel ball, thereby prolonging the service life of the linear guide. In order to eliminate the gap between the bracket and the rail, the preload can improve the stability of the rail system. The preload is obtained by installing an oversized steel ball between the rail and the bracket. The diameter tolerance of the steel ball is ±20 microns, with 0.5 micron increments. The steel balls are screened and classified and installed on the guide rails respectively. The size of the preload depends on the force acting on the steel balls. If the force acting on the steel ball is too large, the steel ball will withstand the preload for too long, which will increase the movement resistance of the bracket. There is a balance problem here; in order to improve the sensitivity of the system and reduce the movement resistance, the preload must be reduced accordingly, and in order to improve the movement accuracy and the retention of precision, it is required to have sufficient preload negative numbers, which are contradictory two. aspect. The design of the guide rail system strives to have the largest contact area between the fixed element and the moving element. This not only improves the carrying capacity of the system, but also the system can withstand the impact force generated by intermittent cutting or gravity cutting, spread the force widely, and expand the bearing capacity. The area of force. In order to achieve this, the groove shape of the guide rail system has various shapes, and there are two representative ones, one is called the Gedai type (pointed arch type), the shape is a semi-circular extension, and the contact point is the apex; One is circular arc shape, which can also play the same role. No matter what kind of structure, there is only one purpose, and strive to have more rolling steel ball radius contact with the guide rail (fixed element).
De factor die de prestatiekenmerken van het systeem bepaalt, is: hoe de rolelementen contact maken met de geleiderail, wat de sleutel tot het probleem is. Streef ernaar om het grootste contactoppervlak te hebben tussen het vaste element en het bewegende element, wat niet alleen de belasting-draagkracht van het systeem kan verbeteren, maar het systeem ook bestand is tegen de impactkracht die wordt gegenereerd door intermitterend snijden of snijden door zwaartekracht , spreid de kracht wijd en breid het kracht-dragende gebied uit. Om dit te bereiken zijn er verschillende groefvormen voor het geleiderailsysteem. Er zijn twee representatieve. De ene wordt het Gedai-type (puntige boogtype) genoemd, de vorm is een halfronde verlenging en het contactpunt is het hoekpunt; de andere De soort is boog-vormig en kan ook dezelfde rol spelen.
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