DSL series · precision coil straightening

Dual-Stage Precision Leveler for Thin Coil Strip

Prepare 0.1–0.6 mm coil strip for precision stamping with pre-leveling and fine leveling in one machine. HENLI DSL levelers reduce incoming coil curvature, refine strip flatness and supply material to the downstream feeder and press.

0.1–0.6 mm stripTwo adjustable leveling stagesDial indicator setupLaser loop control option

Get a Free Quote Check Specifications

HENLI DSL dual-stage precision coil leveler with pre-leveling and fine-leveling sections — DSL dual-stage precision leveler with separate pre-leveling and fine-leveling sections. Contact-type loop sensing is shown; laser sensing is available as a configuration option.

0.1–0.6 mmListed thin-strip working range.

100–400 mmMaximum width choices across DSL-100 to DSL-400.

Pre + FineTwo successive leveling sections.

24 · Ø20 mmCommon roller configuration; matched to the application.

Why two stages?

Correct Coil Set, Then Refine the Strip

Coiled material can retain curvature after unwinding. The DSL uses a preliminary correction section ahead of the longer fine-leveling section, giving the operator two parts of the leveling path to set for the incoming strip.

Single-stage precision leveling

One Roller Section

A single-stage leveler performs the required correction in one roller section. It is a practical choice when the incoming strip condition and required flatness can be handled by that section. Single-stage equipment can also be used in coil-fed production.

Dual-stage precision leveling

Pre-Leveling + Fine Leveling

Use two successive sections when coil curvature needs an initial correction before fine leveling. This is especially relevant to thin coil strip supplied continuously to a precision stamping line. Stage selection depends on the material and required result.

Short pre-leveling section of a HENLI dual-stage precision coil leveler

Stage 1 · Pre-leveling

Reduce the Main Coil Curvature

The shorter roller section makes the initial correction to incoming coil set, preparing the strip for the next leveling section.

Long fine-leveling roller section of a HENLI dual-stage precision coil leveler

Stage 2 · Fine leveling

Apply Further Controlled Bending

The longer roller section applies a sequence of alternating bends. Fine adjustment refines the strip condition before it passes to the feeder.

Stage count and roller support are different choices. Single-stage or dual-stage describes the material path. A 4-Hi or 6-Hi structure describes how the work rollers are supported within a section; it does not mean four or six leveling stages.

Adjustment and repeat setup

Visible Settings for Each Leveling Section

Set the leveling penetration for the material thickness, strength and incoming curvature. Dial indicators provide a visible position reference, making useful settings easier to record and return to during material changeovers.

Dial indicators

Read and Record the Adjustment

The dial indicators show adjustment movement at the head. Record the settings together with the material grade, thickness, width and tested flatness for repeat jobs.

Dial indicator showing the adjustment position on a precision leveler head

Dial scale close-up

A Clear Reference for Fine Adjustment

The close-up shows the graduated dial used to read head movement. Make small adjustments and record the reading for a tested setup. The dial measures adjustment displacement; it does not directly measure the finished strip flatness.

Hand-wheel configuration

Front Hand-Wheel Adjustment

This machine uses front hand-wheels and connecting adjustment shafts, with dial indicators retained for reading the setup. Confirm the adjustment arrangement for the ordered configuration.

Dual-stage precision coil levelers arranged in the HENLI workshop

Workshop reference

Different Builds for Coil-Line Needs

Workshop machines show the separate leveling heads and accessible adjustments. Select the sensing, lubrication and film-handling equipment to suit the strip and downstream process.

Gearbox and universal-shaft drive

Give the Transmission Room to Work

Precision work rollers are small and closely spaced. A separate gearbox gives the main transmission more space for its gear arrangement, while universal shafts connect the gearbox outputs to the roller groups at the required angle.

Dual-stage leveler transmission assembly with gearboxes and connecting drive chain

Transmission layout

Separate Gearboxes and Drive Connections

The assembly view shows the transmission components alongside the two leveling sections. This layout separates the main gearbox arrangement from the tight spacing at the work-roller ends.

How the drive is distributed

Gearbox to Roller Groups

The gearbox arrangement is less constrained by the small spacing between work rollers, giving the designer more room to size the main transmission gears.

Upper and lower universal-shaft inputs carry the drive to the roller groups at the required angle. Roller-end gearing then distributes rotation through each group.

Gearbox → Universal-shaft inputs → Roller-end gearing → Work rollers

The gear-and-oil-line close-up below shows the roller-group inputs together with the lubrication delivery points. The illustrated arrangement does not use a separate universal shaft for every work roller.

The exposed assembly photographs show the transmission for explanation. Production machines use the specified transmission guards.

Automatic circulating lubrication

From the Oil Tank to the Gear Points

The oil supply unit and the gear close-up are shown together so you can follow their relationship: oil is supplied from the reservoir through the connected delivery tubes to the machine’s gear lubrication points.

Automatic lubrication oil reservoir and pump mounted on the precision leveler

1 · Oil supply

Automatic Circulating Oil Unit

The reservoir and pump supply the machine’s gear lubrication circuit. Regular oil supply helps reduce dry running, gear wear and repetitive manual oiling. Check the oil level and follow the specified maintenance schedule.

Universal drive shafts connecting to upper and lower roller-bank gearing

2 · Oil delivery

Copper Tubes at the Roller-End Gears

The copper tubes deliver lubricant to the connected gear points. The same close-up also shows the universal-shaft inputs and roller-end gears, making the relationship between transmission and lubrication visible.

Oil reservoir and pump → Delivery tubes → Gear lubrication points

Machine lubrication: this oil unit lubricates the machine transmission. If stamping also requires oil on the strip surface, specify a separate stock-oiling system.

Loop sensing and operator controls

Match Strip Supply to the Downstream Feeder

Choose the sensing and control arrangement for the material loop and production line. The laser provides non-contact feedback, while the operator panel provides local operating controls.

Green laser loop sensor on an adjustable support beside a dual-stage precision leveler

Non-contact laser sensing

Gradual Speed Changes with Loop Demand

The green laser sensor monitors the strip loop without touching the material. In this configuration it works with the variable-speed drive to increase or reduce speed gradually as the downstream feeder draws material, reducing repeated abrupt changes during normal running.

Leveler operator panel with speed, manual-auto and forward-reverse controls

Operator controls

Speed and Operating-Mode Selection

The panel shown provides local speed adjustment, manual/automatic selection and forward/reverse controls. The panel arrangement and control functions are matched to the supplied machine and its line integration.

Contact sensing or laser sensing: contact-type sensing uses strip contact with an arm to trigger start/stop control. The laser configuration provides non-contact loop feedback for gradual speed regulation. Required stop and protection functions remain part of the supplied controller.

Protective-film handling

Add Film Peeling When the Process Requires It

Some coil materials arrive with protective film that must be removed before the next operation. A film-peeling and take-up device separates and collects the film along the feeding path, reducing loose film around the work area.

Dual-stage precision leveler fitted with an orange protective-film take-up spindle

Machine configuration

Integrated Film Take-Up Device

The orange take-up spindle collects the removed protective film. Its position and operating setup are selected for the required peeling point and material path.

Precision leveler with protective-film take-up device at a coil-fed stamping line

Production-line reference

Film Handling in a Stamping Line

This installation shows film-removal equipment used with a precision leveler in a coil-fed press line. Coordinate film take-up with the strip movement and the surface requirements.

Confirm the film requirement: one-sided or two-sided removal, film type and adhesive, strip width, required peeling position and line speed. The illustrated machines show configuration examples; the final device is matched to your material.

DSL model range

Dual-Stage Precision Leveler Specifications

Use the listed model data for initial selection, then match material strength, width, surface condition and flatness requirements. The common 24-roller, Ø20 mm layout is a reference configuration for this DSL range.

Specification	DSL-100	DSL-200	DSL-300	DSL-400
Maximum material width	100 mm	200 mm	300 mm	400 mm
Material thickness	0.1–0.6 mm	0.1–0.6 mm	0.1–0.6 mm	0.1–0.6 mm
Common roller layout	24 rollers · Ø20 mm	24 rollers · Ø20 mm	24 rollers · Ø20 mm	24 rollers · Ø20 mm
Leveling stages	Pre-leveling + fine leveling	Pre-leveling + fine leveling	Pre-leveling + fine leveling	Pre-leveling + fine leveling
Leveling speed	0–16 m/min · VFD	0–16 m/min · VFD	0–16 m/min · VFD	0–16 m/min · VFD
Motor power	1 HP	1 HP	2 HP	2 HP
Drive arrangement	Gearbox + universal-shaft input + roller gears	Gearbox + universal-shaft input + roller gears	Gearbox + universal-shaft input + roller gears	Gearbox + universal-shaft input + roller gears
Adjustment	Manual fine adjustment with dial indicators	Manual fine adjustment with dial indicators	Manual fine adjustment with dial indicators	Manual fine adjustment with dial indicators

Scroll sideways on smaller screens. Imperial values are rounded conversions. Roller layout, adjustment arrangement, head access, lubrication, loop sensing, film peeling and electrical supply are confirmed in the selected configuration.

Material fit comes first. Share the actual alloy or steel grade, temper or hardness, thickness and width range. A listed thickness range alone does not establish the result for every material or surface finish.

Coil-fed precision stamping

Place the Leveler Between Pay-Off and Feeding

The decoiler releases the coil, the leveler corrects the strip, and a buffer loop allows the downstream feeder to follow the press cycle. Size and control the line as a complete material-handling process.

01 · DecoilerSupports the coil and releases strip.

02 · DSL LevelerPre-leveling followed by fine leveling.

03 · Buffer + FeederLoop storage and controlled feed pitch.

04 · Stamping PressProcesses the strip through the tooling.

Entry rollers and adjustable side guides on a precision coil leveler

Entry guiding

Position the Strip at the Leveler Entry

Adjustable side guides help position the strip as it enters the machine. Set the guides for the actual strip width and material path, with suitable clearance for the material edges.

Metal strip passing through the two sections of a precision coil leveler

Material path

Strip Through Both Leveling Sections

The two sections act successively along the strip path. Set the preliminary and fine-leveling sections for the incoming coil condition and the required result before the material reaches the downstream feeder.

HENLI coil-fed stamping installation with decoilers, precision levelers, NC feeders and presses — Coil-fed stamping installation with decoilers, precision levelers, NC feeders and presses. Each line is matched to its material and production requirements.

Terminals and connectors

Thin Strip Before Precision Dies

Review copper alloys, suitable stainless steel and other thin strip where incoming curvature can affect presentation to the feeder and die.

Shielding and electronic parts

Flatness and Surface Appearance

Define the flatness target together with acceptable roller marks or scratches, coating condition and any protective-film removal requirement.

Motor laminations

Coordinate Strip Supply

Assess suitable electrical-steel strip within the model range, including coating sensitivity, feeding pitch, press rate and the average line speed required.

View Decoiler Machines View NC Servo Feeders

Choose the right leveling route

Match the Machine to the Strip and Required Result

Start with your existing coil condition and the result needed at the next process. A representative sample trial helps confirm settings, surface condition and whether one or two leveling stages are appropriate.

Incoming material

Grade, Temper and Coil Set

Provide thickness and width ranges, material strength or hardness, coil I.D./O.D. and weight, plus photos showing curl, wave or other deformation.

Acceptance requirements

Flatness and Surface Quality

Specify the target flatness, measurement length and inspection method. State which surfaces are appearance-critical and whether the strip is coated, anodized or film-covered.

Production conditions

Feeder, Press and Space

Provide feeding pitch, press strokes per minute, required strip speed, available loop space, production direction and site power supply.

Single-Stage Precision LevelersReview precision leveling configurations for sheet and coil material.Ultra-Precision Thin-Strip LevelersReview smaller work rollers and support structures for thinner stock.Sheet & Coil Leveling SolutionsCompare the material path and equipment selection for your process.

Quotation and sample testing

Send Your Coil Data for DSL Selection

Tell us what enters the machine and what your next process needs. HENLI can review the leveling stages, roller layout and options for your coil-fed stamping line.

1Material: grade, temper or hardness, thickness, width, coil dimensions and incoming deformation.

2Required result: flatness target, inspection method, surface finish and protective-film requirements.

3Line: feeder and press, feeding pitch, operating speed, available space and electrical supply.

For demanding material or surface requirements, agree a representative sample and acceptance criteria before the leveling trial.

FAQ

Dual-Stage Precision Leveler Questions

What is the DSL dual-stage precision leveler mainly used for?

The DSL series is mainly used for continuous thin coil strip before precision stamping. Its listed 0.1–0.6 mm range covers suitable material for terminals, connectors, shielding parts and motor laminations. Select the model from material grade, temper, thickness, width, incoming coil set, surface requirements and line speed.

Why use two leveling stages instead of one?

The first section reduces the main incoming coil curvature. The second section applies further controlled alternating bends to refine the strip flatness before feeding. A single-stage precision leveler can be sufficient when it achieves the required result on the actual material. Dual-stage leveling is useful when preliminary coil-set correction and fine leveling need separate adjustment.

Does dual-stage mean 4-Hi or 6-Hi?

No. Single-stage and dual-stage describe the number of successive leveling sections along the material path. 4-Hi and 6-Hi describe the roller support arrangement within a leveling section. Choose the stage arrangement and support structure separately according to the material and surface requirements.

Why does the leveler use a gearbox and universal shafts?

Small, closely spaced work rollers leave limited room for transmission components at the roller ends. A separate gearbox gives the main transmission more layout space, while universal shafts connect the gearbox outputs to the upper and lower roller groups. The roller-end gear train continues to distribute the drive within each group.

How does laser loop control differ from contact control?

Contact-type control uses strip contact with a sensing arm to trigger a start or stop. In the laser-controlled configuration, a non-contact sensor monitors loop position and works with the variable-speed drive to increase or reduce speed gradually during normal production. The final control settings and stop functions depend on the supplied machine and line integration.

What does the automatic circulating lubrication system lubricate?

The automatic circulating lubrication unit supplies oil to the machine transmission lubrication circuit, including the connected gear lubrication points. It helps maintain regular lubrication, reduce dry running and gear wear, and reduce repetitive manual oiling. It is a machine lubrication system; strip oiling for stamping is a separate process.

Can the machine remove protective film from the strip?

A film-peeling and take-up device can be included when protective film needs to be removed during the coil-feeding process. Confirm whether one or both sides need peeling, the film and adhesive, strip width, removal position and production speed so the peeling arrangement can be matched to the line.

Are laser sensing, automatic lubrication and film peeling included on every machine?

These features are available as configuration choices. The photographs show different machines and combinations of options. The quotation and approved configuration identify the adjustment arrangement, sensing method, lubrication system, film-peeling device and maintenance access supplied for your project.

Can DSL be selected just from material thickness?

Thickness is the first check, together with width and material strength. Grade, temper, incoming curvature, flatness target and surface acceptance also matter. For material below 0.1 mm, wider or thicker stock, or particularly demanding surfaces, ask HENLI to review a different precision-leveler configuration.

What should I send for selection and sample testing?

Send material grade and temper, thickness range, width range, coil data, incoming strip photos, flatness target and measurement method, surface requirements, feeding pitch, press speed and available line space. Include film-removal requirements and site power supply. Agree representative samples and acceptance criteria before the trial.