Solution
Solutions
Stripes, Cracks, or Bubbles on Aluminum Extrusion Surfaces?
- Poor or worn die design causing uneven extrusion flow.
- Impurities or gas bubbles inside the aluminum billet.
- Excessive extrusion speed causing overheating or excessive shear stress.
Solution
- Optimize die design to ensure uniform flow channels, and maintain or replace dies regularly.
- Use high-purity aluminum billets to reduce internal impurities and gas bubbles.
- Control extrusion speed and temperature to avoid excessive strain and material damage.
Uneven Strength, Deformation, or Brittleness after T4/T6 Treatment?
- Inaccurate control of heat treatment temperature or time, resulting in uneven precipitate distribution.
- Cooling rate that is too fast or too slow, affecting structural stability.
- Residual internal stress not fully relieved.
Solution
- Precisely control heat treatment furnace temperature and time to ensure uniform alloy precipitation.
- Adjust cooling rate to avoid over-hardening or softening.
- Apply stress-relief treatment to reduce deformation caused by heat treatment.
Uneven Inner Diameter or Rough Inner Wall Affecting Fluid Applications?
- Uneven die pressure distribution during extrusion or cold drawing, causing inner diameter variation.
- Poor surface treatment during cold drawing, resulting in excessive inner-wall roughness.
- Insufficient cleaning and polishing, leaving oxides that affect inner-wall quality.
Solution
- Use high-precision dies to ensure uniform inner and outer diameters.
- Add centerless grinding and ultrasonic cleaning to improve inner-wall smoothness.
- Apply precision cold drawing to control inner-wall dimensions and surface roughness (Ra ≤ 0.8 μm).
Excessive Dimensional Error after Cold Drawing? Tolerances Not Met?
- Elastic recovery during cold drawing causing excessive springback.
- Uneven wall thickness causing inner and outer diameter variation.
- Improper annealing, leaving material stress insufficiently released.
Solution
- Optimize cold drawing parameters and adjust drawing passes and strain control based on alloy characteristics.
- Ensure uniform wall thickness and improve inner and outer diameter tolerances through multi-pass cold drawing.
- Apply proper intermediate annealing to reduce internal stress and prevent dimensional deformation.
Uneven Anodized Film, Poor Adhesion, or Discoloration?
- Oil contamination or oxide layers on the aluminum surface affecting the anodizing reaction.
- Unstable electrolyte concentration or current density causing uneven anodized film thickness.
- Alloy composition affecting anodizing reactivity.
Solution
- Ensure proper surface cleaning, including degreasing and acid pickling, to improve anodizing quality.
- Precisely control anodizing parameters such as electrolyte concentration, voltage, and time.
- Select suitable alloy materials such as 6063, 5052, or 7075 to achieve optimal anodizing results.