Ultrasonic Cleaning Fixture and Basket Design

Why Do Fixtures and Hanging Baskets Affect Cleaning Performance?

Ultrasonic cleaning removes contamination from the workpiece surface through cavitation bubble impact. However, if the fixture or basket has the following conditions, the bubbles may not effectively reach the surface:

• Dead corners, blind areas, or shadow zones blocking ultrasonic waves
• Workpieces placed too closely or stacked together, preventing sufficient liquid contact
• Workpieces overlapping, causing the sound field to be unable to penetrate
• Poor drainage holes absorbing ultrasonic energy
• Fixture contact with the tank wall causing abnormal resonance

Common Fixture and Hanging Basket Design Mistakes

❌ 1. Workpieces Are Too Close or Stacked

• Ultrasonic cleaning requires “liquid + cavitation bubbles.” If the bubbles cannot reach the surface, the workpiece will not be cleaned thoroughly.


❌ 2. Basket Mesh Is Too Small

• If the basket mesh is too small, it blocks ultrasonic waves, causing energy reflection or absorption and resulting in poor cleaning performance.


❌ 3. Basket Material Is Too Thick or Too Heavy

• Thick metal absorbs energy and may reduce ultrasonic energy by 30–50%.


❌ 4. Workpieces Are Placed in the Shadowed Corners of the Basket

• The corners of the tank and basket naturally have weaker energy, especially in areas with many corners.


❌ 5. Fixture Touches the Tank Bottom or Tank Wall

• Ultrasonic waves may reflect abnormally.
• Power distribution becomes uneven.

Correct Workpiece Design Method

1. Single-Layer Placement and Avoid Stacking

• Each workpiece must be in contact with the water and allow space for cavitation bubbles to reach the surface.
• Maintain at least 5–15 mm of spacing.

2. Do Not Press the Workpiece Against the Basket Corner

• Corners usually have the lowest energy.
• Place the workpiece as close to the center area of the basket as possible.

3. Workpiece Direction Should Match the Ultrasonic Energy Direction

• For parts with holes, the hole side is more likely to receive cavitation bubbles.
• For threaded holes, allow the workpiece to be positioned so energy can enter the thread gap.

4. Use Suitable Basket Mesh Size

• 10–12 mm square mesh balances strength and ultrasonic penetration.
• Mesh that is too dense will absorb ultrasonic waves.

5. Avoid Full Surface Contact Between the Workpiece and Fixture

• Leave gaps between the workpiece and fixture so cavitation bubbles can collapse effectively.

The fixture, hanging basket, and workpiece placement method are key factors affecting ultrasonic cleaning performance.
Proper placement allows every surface to receive strong and uniform cavitation energy.
If the equipment still cannot clean thoroughly, it is often not a power issue, but a fixture design issue.
YONG JI Enterprise can provide complete fixture design and testing according to workpiece characteristics, helping every batch of workpieces achieve the most stable, clean, and consistent cleaning quality.

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永技企業有限公司

YONG JI Enterprise Co., Ltd.

243新北市泰山區中港西路137-10號

No. 137-10, Zhonggang W. Rd., Taishan Dist., New Taipei City 243079, Taiwan (R.O.C.)

TEL: +886-2-2297-1195

FAX: +886-2-2297-1053