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Le principal avantage d’une vis à double pas est de pouvoir rétablir le jeu après usure par déplacement axial. Le mois dernier, nous avons aidé un client d’équipements de positionnement à régler un réducteur à double pas de 0,12 mm à 0,03 mm ; la précision a été rétablie.
1. Description du problème
L’équipement assure un positionnement précis ; le jeu de retour devait rester sous 0,03 mm. Après deux ans, le positionnement dérivait et le jeu avait augmenté.
À l’ouverture, usure normale sans dégât grave. Pas besoin de changer les pièces — un réglage du jeu suffisait.
2. Procédure de réglage
Étape 1 : mesurer le jeu actuel. Bloquer la vis, placer l’indicateur sur le bord de la roue, faire osciller la vis ; la lecture est le jeu de retour. Mesure client : 0,12 mm — environ quatre fois la valeur neuve.
Étape 2 : desserrer les écrous de blocage du palier de vis. Ne pas les retirer complètement — juste assez pour permettre le déplacement axial.
Étape 3 : frapper légèrement l’extrémité de la vis avec un chasse en cuivre et avancer axialement par pas d’environ 0,02 mm.
Étape 4 : après chaque déplacement, remesurer. S’arrêter vers 0,03 mm.
3. Contrôles après réglage
Après réglage, vérifier aussi :
– Rotation manuelle fluide sans point dur
– Empreinte de contact au milieu du flanc
– Jeu inchangé après resserrage des écrous
Essai : précision revenue au niveau neuf sans changement de pièces, économies à la clé.
4. Précautions
Plus petit n’est pas toujours mieux. Si à 0,03 mm la rotation devient nettement dure, on a trop serré — relâcher un peu. Un jeu trop faible nuit à la lubrification, élève la température et réduit la durée de vie.
Vis et roue à double pas doivent être appariées et ne sont pas interchangeables. Dezhou Xinmi Machinery usine des couples à double pas et accepte plans ou échantillons.
