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Umbrella metal part

3-Fold Telescopic Shaft

Overview

Made by
Supply chain / partners
Materials
Cold-rolled carbon steel tube, Stainless steel tube (SUS304), Aluminium tube (6061/6063)
Finish options
Black electrophoresis (E-coat), Chrome / nickel plating, Powder coating, Anodising (aluminium)

Manufacturing process & quality control points

Qinxi in-houseSupply chain / partnersIn-house or supply chain
  1. 1

    Tube cutting & straightening

    Supply chain / partners

    Tube stock is cut to section length and straightened. Length tolerance and straightness set the ceiling for how smoothly the three sections telescope.

    Quality control points

    • Length & squareness · Steel rule / caliper, tolerance per drawing (typ. +/-0.5 mm) · First article + 1 pc per 2 h
    • Straightness · Roll on flat plate, no visible wobble · First article + 1 pc per 2 h
  2. 2

    Swaging / section reducing

    Supply chain / partners

    Each section is swaged or drawn to its stepped outside diameter so the tubes nest. Die condition controls wall thinning and roundness.

    Quality control points

    • Section OD & wall thickness · Caliper + tube wall gauge, no thinning beyond drawing · First article + 1 pc per 2 h
    • Surface defects · Visual: no cracks, folds or deep draw marks · 100%
  3. 3

    Punching & slot milling

    Supply chain / partners

    Holes for the lock bead, spring seat and latch, plus the anti-rotation slot, are punched or milled. Burrs here are a leading cause of jamming.

    Quality control points

    • Hole position & size · Go / no-go pin gauge · First article + 1 pc per 2 h
    • Burr height · Visual + finger nail check, no burr on inner wall · 100%
  4. 4

    Deburring & pre-treatment

    Supply chain / partners

    Vibratory or manual deburring followed by alkaline degreasing and rinsing. An oil-free surface is mandatory before plating or E-coating.

    Quality control points

    • Oil / soil residue · Water-break test, continuous film · Per load
    • Burr removal · Visual under light · 100%
  5. 5

    Surface finishing

    Supply chain / partners

    Black electrophoresis, chrome or nickel plating, or powder coating. Japan and EU buyers commonly require 48 h neutral salt spray with no red rust.

    Quality control points

    • Coating thickness · Coating thickness gauge, per drawing (typ. 5-15 um) · 5 pcs per batch
    • Adhesion · Cross-cut test per ISO 2409 / ASTM D3359 · 1 pc per batch
    • Corrosion resistance · Neutral salt spray 24-48 h, no red rust (per buyer spec) · Per order / per plating lot
  6. 6

    Telescopic fit & lock check

    Supply chain / partners

    Sections are assembled dry and cycled. Lock beads and latch seats must index positively with an audible click.

    Quality control points

    • Telescoping smoothness · Manual extend / retract x10, no sticking · 100%
    • Lock bead engagement · Manual: positive index, no override · 100%

Used in

Automatic Open-Close 3-Fold Umbrella

Relevant compliance

Get a quote for 3-Fold Telescopic Shaft

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