Essential Cutting Head Precautions: A Step-by-Step Guide for Installation & Maintenance

Cutting head Precautions are vital for protecting cutting heads, ensuring stable performance, and avoiding costly damage. Whether installing for the first time at an OEM company or reconfiguring at a client’s site, following strict rules reduces risks like lens contamination and fiber breakage. This guide details key steps and safety measures to keep your cutting head in top condition.

1. Cutting Head Precautions for First-Time Installation at OEM Companies

First-time installation demands clean environments and careful checks to prevent initial damage. Follow these four key steps:

Step 1: Inspect the Cutting Head and Secure the QBH Interface

Work in a cleanroom or flow box. Run the flow box for about 30 minutes first. Check the cleanliness of the cutting head’s optical path lenses. This stops dust from the shipping process from getting into the upper protective lens.

If you find dust on the upper protective lens, clean it right away. Then, insert the optical fiber into the cutting head inside the flow box. Before insertion, put the black leather cover (supplied with the cutting head) on the fiber. Seal the fiber connection with white tape to block cutting dust from entering the cutting head cavity.

Step 2: Test Run the Machine and Check the Upper Protective Lens

Install the fiber-connected cutting head onto the machine. Let the machine’s XYZ axes run empty for 5–10 minutes. If the surrounding environment is clean, quickly remove the upper protective lens. Seal the opening immediately after removal.

Check if the upper protective lens is clean. If there is dust, clean it in the flow box and reinsert it. Or replace it with a new upper protective lens module. This step removes dust or metal shavings brought in when inserting the fiber. For IPG lasers, improper fiber insertion can create metal shavings—this test run shakes them off.

Step 3: Wrap the Cutting Head Body with Tape

Use white tape to wrap the cutting head body. Focus on sealing gaps on the outer surface. Leave only the coaxial adjustment area uncovered.

This does two things: it keeps the cutting head from looking old (due to smoke staining) before delivery to clients. It also stops cutting smoke from seeping into the cutting head and contaminating the collimating and focusing lenses. You can do this step right after Step 1 for easier operation.

Step 4: Test the Cutting Head’s Diffuse Reflection Value

Do not cut at full power right after the first three steps. Start with 1KW power and run for 40–60 seconds. Watch for obvious changes in the reflection value.

If there are no changes, increase power by 1KW each time (run 40–60 seconds per level) until reaching full power. If the reflection value changes suddenly at any level, stop the laser immediately. Check and replace the upper and lower protective lenses first. If they are fine, inspect the optical fiber. If all three are in good condition, send the cutting head back for repair—do not keep using it. Only use the cutting head if the diffuse reflection value and temperature stay normal.

2. Cutting Head Precautions for Second Installation at Client Sites

It is best to ship the cutting head and fiber together. This avoids repeated insertion/removal that increases lens contamination risks. If you must separate them, follow these steps for on-site reinstallation:

Step 1: Clean Protective Lenses Before Shipping

Before shipping, take the cutting head to a cleanroom. Check the upper and lower protective lenses. Clean any dust and replace lenses with burn marks. This prevents laser damage to lenses from dust left after initial testing.

Step 2: Clean and Connect the Fiber On-Site

Follow the laser manufacturer’s rules to clean the fiber’s metal arm and quartz block end. Insert the fiber into the cutting head quickly. Put the black leather cover on the fiber and seal the connection with white tape. This blocks cutting dust from entering the cutting head.

Steps 3–5: Repeat First Installation Steps

Step 3: Run the machine’s XYZ axes empty (same as Step 2 of first installation).

Step 4: Wrap the cutting head body with tape (same as Step 3 of first installation).

Step 5: Test the diffuse reflection value (same as Step 4 of first installation).

3. Cutting Head Precautions: Fiber Bending Radius

Pay close attention to the fiber’s bending radius on the Z-axis. It must not be less than 200mm. A smaller radius causes fiber fatigue and breakage over time.

Never install the fiber in a “bowtie” shape. This creates torque on both the fiber and cutting head. Torque can loosen the fiber connection and trigger a fiber circuit break alarm.

4. Cutting Head Precautions for Maintenance

Maintenance steps like replacing heads or lenses need strict adherence to clean practices.

A. Installing Replacement or Spare Cutting Heads

Always handle fiber insertion/removal for replacement heads in a flow box. Follow these steps:

1. Choose morning or evening for installation—air quality is better, with fewer people moving and no air flow.
2. Clean dust on the fiber surface with alcohol.
3. Clean the fiber end according to the laser type’s requirements.
4. Insert the cutting head and fiber horizontally (same as new cutting head installation). Wrap the QBH interface with tape and install it on the machine’s Z-axis.
5. Run the XYZ axes empty for a few minutes. Check and clean/replace the upper protective lens (same as Step 2 of first installation).
6. Test the reflection value (same as Step 4 of first installation).

B. Replacing and Cleaning Upper Protective Lenses

OEM engineers can replace upper protective lenses without removing the cutting head from the machine. Remember these rules:

• Choose morning or evening for the task (good air quality, no air flow).
• Wipe the cutting head’s surface with alcohol first. Remove the upper protective lens and check it.
• If there is dust but no burn marks, clean the lens and reinsert it. If there are burn marks, replace it.
• Always seal the opening with tape after removing the lens to stop dust from entering. Only OEM engineers can do this—clients do not have permission.

C. Replacing and Cleaning Lower Protective Lenses

Clients can replace lower protective lenses without removing the cutting head. Follow these steps:

1. Turn on the machine’s dust collector for 5–10 minutes to suck away cutting smoke. Sprinkle some water near the machine.
2. Seal the cutting nozzle’s air outlet with tape.
3. Pull out the lower protective lens module. Seal the opening quickly with a protective cover or tape.
4. Clean or replace the lower protective lens.

Key Reminders for All Cutting Head Precautions

1. Whenever you open the upper or lower protective lenses, seal the opening with a cover or tape immediately.
2. For any fiber insertion/removal or cutting head reinstallation, follow all first-installation steps—never skip or rush any part.

By following these cutting head precautions, you extend the cutting head’s life, ensure stable cutting performance, and avoid unexpected downtime or repair costs.