How to adjust roll forming shears
Adjusting roll forming shears requires precision and attention to detail to ensure clean cuts and consistent performance.
1. Ensure Safety Precautions
- Turn off the power to the roll forming machine.
- Wear protective gear such as gloves and safety glasses.
- Lockout/Tagout procedures should be in place to prevent accidental machine activation.
2. Check Blade Condition
- Inspect the shear blades for wear, nicks, or damage. If the blades are dull or damaged, replace them before proceeding with adjustments.
3. Adjust Blade Clearance
- Blade clearance is crucial for accurate shearing. The clearance between the upper and lower blades should be checked and adjusted according to the thickness of the material being cut.
- Procedure:
- Use a feeler gauge to check the gap between the blades.
- Loosen the adjustment bolts on the shear assembly.
- Adjust the blade gap by moving the blades closer or farther apart based on the material thickness. A typical gap is between 5% to 10% of the material thickness.
- Retighten the adjustment bolts after setting the gap.
4. Align the Blades
- Proper blade alignment ensures that both the top and bottom blades are parallel, avoiding angled or incomplete cuts.
- Procedure:
- Visually inspect the alignment of the blades from the side.
- Use a straight edge or dial indicator to verify that both blades are level.
- If misaligned, adjust the blade holders by loosening the mounting bolts and realigning the blades.
- Retighten the bolts after achieving proper alignment.
5. Set Blade Stroke (Optional)
- Some roll forming machines have adjustable shear stroke lengths depending on the material length or profile.
- Procedure:
- Locate the stroke adjustment mechanism (usually a knob or lever).
- Adjust the stroke so that the blade travels just enough to complete the cut without excessive movement.
- Test the stroke by manually cycling the machine to verify the length is appropriate.
6. Check and Test
- Once the adjustments are made, manually rotate the machine through a cycle to ensure the blades do not bind or interfere.
- Perform a test cut on a sample of the material to verify the shear operation is clean and accurate.
- Make additional fine adjustments if needed based on the test results.
7. Maintenance
- Regularly check and lubricate moving parts of the shears to reduce wear.
- Periodically inspect blade sharpness and overall shear performance.
Following these steps will help you achieve precise shearing results and prolong the life of your roll forming machine.