Tubes et interfaces · Guide d'évaluation des composants · Litian Yunde
Concept explicatif généré par l'IA ; il ne s'agit ni d'une photographie de produit de Litian Yunde ni d'un design validé.
Measuring a carbon fiber tube bore at each end does not establish the condition of every section between them. State what the bore must do, where measurements are required and which regions the chosen method can reach. For a sliding insert or routed cable, a separate functional passage check may also be necessary.
Start with the object that passes through
Identify the mating insert, guide, cable or connector that must enter the bore. Record its controlling envelope and the assembly direction. A short plug at the opening checks a different condition from a long insert travelling through the tube. Include the length involved and any stop or step. Avoid asking only for an inside diameter when the actual concern is whether a specific assembly can move through the passage.
Document the limits of measurement access
Choose accessible stations and a method suitable for the requirement. Record distance from the named reference end and the directions measured where relevant. An end reading should be labelled as an end reading; it should not become a full-length statement in a certificate. If deeper regions cannot be reached, discuss another suitable method or a defined functional check. The supplier should explain the coverage of the proposed inspection, including any unmeasured region.
Keep passage and dimensional records separate
A go-through trial can reveal an obstruction or assembly problem, but it does not necessarily produce a dimensional map of the bore. Define the trial object, travel direction, allowed handling and pass criterion. Do not force a part through until it fits or remove material without an approved operation. Preserve bore measurements, condition observations and the functional result as separate records tied to the same tube identity.
Example: a long locating insert
A buyer accepts the two bore-end readings, but a long locating insert stops midway during assembly. The review now includes the insert envelope and required travel, identifies the limit of the original inspection, and agrees further checks. The team records the obstruction before any rework, so a later successful passage does not erase the original finding.
Scénario à titre d'exemple ; il ne s'agit ni d'un cas client ni d'un résultat de production avéré.
Éléments à convenir avant de passer commande
| Article à évaluer | Consigner pour accord |
|---|---|
| Fonction | Mating envelope, travel and insertion direction. |
| Stations | Distance from a named end and measurement directions. |
| Coverage | Accessible and unmeasured bore regions. |
| Trial | Defined reference object and passage criterion. |
Questions posées par les acheteurs
Does a short plug gauge prove the whole bore is acceptable?
It supports the specific region and criterion it checks. Full-length coverage needs to be defined separately.
Should a tight insert be forced through?
No uncontrolled forcing should substitute for an agreed assembly or inspection method. Record the issue and seek disposition.
Contexte technique et lectures complémentaires
Document d'information : NPL : Bonnes pratiques fondamentales en métrologie dimensionnelle. À titre d'information uniquement ; la liste de contrôle du projet constitue une orientation rédactionnelle, et ce document ne vaut ni certification du fournisseur ni homologation des pièces.
- Rondesse et ajustement des tubes : s'accorder sur les paramètres à mesurer
- Tubes ovales en fibre de carbone : nommez l'axe principal et le sens de montage
- Parcourez le centre de connaissances sur la fibre de carbone
Passez en revue votre composant avec Litian Yunde
Veuillez nous communiquer la version révisée du plan, l'application prévue ainsi que la question relative à l'interface ou au contrôle que vous souhaitez voir résolue. Les exigences de construction et de réception mentionnées sont validées pour ce projet spécifique.