Manual Leveling Machine (30mm Roll Diameter)

Product Introduction

A manual leveling machine is a precision mechanical device used to relieve internal stresses in metal sheets and correct warping and deformation. Its core operating principle involves using upper and lower rollers arranged in an alternating pattern to subject the passing sheet metal to repeated elastic-plastic bending. This process gradually aligns the sheet’s internal fibers of varying lengths, thereby achieving a flat surface.

“30mm roller diameter” refers to the diameter of the machine’s leveling rollers being 30 millimeters. The size of the roller diameter directly determines the machine’s leveling capability and range of applications. Generally, rollers with smaller diameters (such as 30 mm) are better suited for precision leveling of thin sheets, as they provide a smaller bending radius. This effectively eliminates subtle waves and distortions while preventing indentations on the sheet surface.

This type of equipment is widely used in sheet metal fabrication, automotive manufacturing, aerospace, and electronics industries to process various metal materials, including steel, stainless steel, aluminum, and copper sheets.

Product Advantages

Compared to automated leveling equipment, manual leveling machines demonstrate significant advantages in specific application scenarios due to their unique design and operating methods.

Precision Control

• Manual adjustment capabilities provide operators with exceptional control precision. Using handwheels or dials, the roller gap can be finely adjusted to precisely control the amount of pressure applied in each pass, enabling precise control of the leveling process and ensuring the sheet metal achieves the required flatness.

Cost-Effective

• For small-batch, high-variety production or single-piece processing with extremely high flatness requirements, manual leveling machines eliminate the need for complex programming and debugging. Operators can make immediate adjustments based on experience to quickly achieve the desired results, effectively reducing equipment investment and commissioning costs.

Flexible and Durable

• The equipment features a relatively simple structure that is robust and durable, with low failure rates and minimal maintenance costs. Its flexibility lies in its ability to accommodate sheets of various specifications and initial deformation states, making it particularly suitable for handling complex deformations or special workpieces that automated equipment struggles to process.

Technical Specifications

Operating Guidelines

Proper operation is key to ensuring effective leveling results and equipment safety. The following is a general operating procedure for manual leveling machines; please adjust it according to your specific equipment model.

I. Pre-Startup Preparation

1. Safety Inspection: Ensure operators are wearing appropriate protective gear (e.g., cut-resistant gloves, safety shoes). Inspect the area around the equipment and clear any debris from the entry and exit points.

2. Equipment Inspection: Check the equipment’s lubrication status and ensure the gearbox oil level is normal. Inspect the surface of the leveling rolls to ensure they are clean and free of weld slag, hard scale, or other contaminants to prevent scratching the sheet metal.

3. Material Verification: Measure the thickness and width of the sheet to be leveled, ensuring they fall within the range specified on the equipment nameplate.

II. Parameter Adjustment

1. Set Zero Point: Start the equipment under no-load conditions and slowly lower the upper set of leveling rolls until they make slight contact with the lower set (this can be tested with a sheet of thin paper; if it cannot be pulled out, the contact is sufficient). Reset the handwheel or digital display to zero to serve as the reference point for subsequent adjustments.

2. Coarse Roll Gap Adjustment: Set the initial roll gap based on the sheet thickness. A common rule of thumb is: Total reduction ≈ (1.5 ~ 2) × sheet thickness. For example, for a 4mm-thick sheet, lower all upper rolls by 6–8mm for the initial attempt.

3. Test Leveling and Fine-Tuning:

• 1. Take a test sheet of the same specifications, approximately 300 mm long, and feed it into the machine at low speed in short, intermittent strokes.

• 2. Observe the shape of the sheet as it exits:

(1) If the exit end of the sheet curves upward, this indicates excessive reduction; slightly raise the upper rollers by 1–2 notches.

(2) If the sheet retains its original warped state, this indicates insufficient reduction; lower the upper rollers symmetrically by 1 notch.

(3) Adjust the roller gap difference: If the sheet exhibits “curved ends and a flat center,” slightly increase the compression on the inlet side; if it exhibits “a bulging center and flat ends,” slightly increase the compression on the outlet side.

(4) Eliminate localized waviness: For localized bulges on the sheet surface, individually fine-tune the corresponding upper roller to perform “point-to-point” corrections.

III. Mass Production

1.  Consistent Feed Rate: Once parameter adjustments are complete, mass production may begin. Feed the sheets one at a time; stacking is strictly prohibited.

2.  In-Process Inspection: It is recommended to inspect one sheet out of every five processed using a straightedge and feeler gauge to check flatness. If any non-conformities are found, re-calibration is required.

IV. Shutdown and Maintenance

1. Shutdown Procedure: After all remaining material has been processed, turn off the main motor and disconnect the main power supply.

2. Cleaning and Maintenance: Use an air gun to blow away metal dust and debris from the roller surfaces and machine body, then wipe them clean with a dry cloth.

3. Record-Keeping and Shift Handover: Fill out the equipment operation log, including the specifications of the processed material, the set roller gap, and any abnormalities, and ensure a proper shift handover.