C Purlin Roll Forming Machine: Buyer’s Guide, Specs & Selection

A C purlin roll forming machine is dedicated cold-roll-forming production gear that turns flat steel coils into well-finished C-shape purlins. It serves steel fabricators, prefab builders and construction material suppliers to mass-make roof purlins, wall girts and secondary structural framing parts.

As professional purlinmaking equipment, our C purlin roll forming lines come in automatic pre-punch versions (light-duty, medium-duty, heavy-duty) plus general fully-automatic models for high-volume continuous runs. When buyers shop for an automatic C purlin machine, they care most about profile size range, material thickness capacity, punching function, forming speed, cutting tolerance and after-sales support.

This buyer-friendly guide walks you through key points before you place an order: working workflow, core machine parts, standard unit specs, real-world benefits, selection tips, price-related factors and FAQs. You can check out our product page for detailed configuration options.

What Is a C Purlin Roll Forming Machine?

A C purlin roll forming machine is a continuous coldbending production line built to produce C-shaped steel purlins from raw steel coils. Unlike press brakes that bend one piece at a time, this line feeds steel strip through multiple forming stations and gradually bends metal into target C-profiles without heavy internal stress.

A finished C purlin normally includes a flat vertical web, two horizontal flanges and reinforced lips at flange ends for better load-bearing performance. It can also come with pre-drilled mounting holes for fast site installation. Our pre-punch type C purlin roll forming machine makes holes on flat steel strip before roll forming, so you won’t run into hole shifting or profile twisting after shaping. We can customize web height, flange width, lip size and processing thickness to fit your project drawings. Many buyers simply call this unit an automatic C purlin machine in daily communication.

What Products Can a C Purlin Roll Forming Machine Make?

Our automatic C purlin roll forming machine outputs C-section steel parts widely used across modern steel construction:
-Roof purlins for metal building systems
-Wall girts for exterior wall cladding
-Secondary structural frames for industrial plants
-Support members for warehouses and workshops
-Components for pre-engineered prefab buildings

Supported raw materials cover galvanized steel, pre-painted steel, Q235, Q345 and S355 steel. Our heavy-duty automatic C purlin machine can handle 550 MPa high-strength steel. Usable material thickness ranges from 1.5 mm to 4.0 mm based on machine grade. Both standard and custom C purlin profiles are available for commercial and industrial jobs.

How Does an Automatic PrePunch C Purlin Roll Forming Machine Work?

Our standard automatic prepunch C purlin roll forming machine runs through 6 clear steps. It strictly follows the workflow: leveling → punching → roll forming, to get smoothlyshaped profiles with stable dimensions.

1. Coil Uncoiling

You load steel coils onto the uncoiler (uncoiler is optional; you may pick non-power cantilever type or hydraulic expansion type). The unit releases steel strip at stable tension to feed the whole line and avoid unstable feeding hurting finished quality.

2. PreLeveling & Guided Feeding

Steel strip passes our 7-roll leveling unit (4-upper, 3-lower, Φ95 mm leveling rollers) to remove coil camber and surface bending. After flattening, the strip goes into guide assemblies for precise edge alignment, getting ready for punching and forming work.

3. Hydraulic PrePunching (Standard Feature)

All punching work happens on flat steel before shaping. If you need mounting holes on purlins, the hydraulic punching station stamps preset hole patterns onto flat strips. Available hole types: single bottom hole, double bottom holes, double flange holes, standard hole size 14×22 mm. Punching on flat metal effectively prevents hole offset and profile distortion after cold bending. Matching hydraulic front shear uses Cr12MoV tool steel cutters to trim coil head & tail, suitable for steel strips longer than 2.5 m.

4. Progressive Roll Forming

Leveled and pre-punched steel strip moves through groups of forming rollers. Each roller group completes a small bending angle until the complete C-shape comes out. Forming rollers adopt Cr12 tool steel rollers (Mark: Cr12 hardness equivalent to D3). These rollers deliver high hardness and great wear-resistance for long-term stable forming performance. Light / medium / heavyduty units apply different formingstation counts for regular or thick high-strength steel.

5. Precision Shearing to Length

When profiles reach your target length, the universal hydraulic shear with Cr12MoV cutters cuts steel to size. Cutting tolerance can reach ±1 mm. High-end configurations work with encoders and PLC intelligent control to meet strict precision requirements from construction projects.

6. FinishedPart Discharge

Finished C purlins move onto nonpower runout tables for collection and packaging, ready for delivery to construction sites.

Core Components of Automatic PrePunch C Purlin Production Line

Our full automatic pre-punch C purlin roll forming line includes standard parts plus optional add-ons, to realize full-auto workflow from coil feeding to finished-part output.

Standard configuration: Hydraulic front shear unit, 7-roll leveling & feeding assembly, hydraulic pre-punch station, forming main host, universal rear shear, hydraulic power pack, integrated electric control cabinet, non-power run-out table, insert-type safety guards, original tool set and wear spares. Electric system includes Siemens touch-screen, Omron encoder and wireless remote controller. Operators can adjust web / flange width, punching quantity and cutting length directly on HMI.

Optional configuration: 5ton nonpower cantilever uncoiler; 5ton hydraulic expansion uncoiler.

Component quality directly decides machine stability, profile accuracy, running speed and service life. When you compare different supplier quotations, pay close attention to PLC brand, hydraulic system, drive motors, bearings and shear blade specifications.

Automatic C Purlin Machine Models & Technical Specs

Our automatic pre-punch C purlin roll forming machines have 3 grades: light-duty, medium-duty and heavy-duty. They cover most light, medium and heavy steel-structure project requirements.

Machine Grade	Model	Web Height	Material Thickness
Light-duty Automatic C-Machine	C80-300	40-80mm	1.5-3.0mm
Medium-duty Automatic C-Machine	C100-300	45-100mm	1.5-3.0mm
Heavy-duty Automatic C-Machine	C100-300	45-100mm	1.5-4.0mm

Custom-built machine note: Besides above standard models, we provide custom roll-forming machines. We build complete production lines strictly according to your actual profile drawings, special hole layouts, unique dimensions or heavy-gauge high-strength steel working conditions. Feel free to reach out for consultation.

Key differences among models

1. Light-duty C80-300 Overall dimension: 9450×1880×1820 mm, machine weight approx.10 tons. Forming stations:14 forming passes + stiffener pass + 2 shaping passes; roller shaft Φ65 mm, side-plate thickness 28 mm. Punch cylinder Φ110 mm, front-shear cylinder Φ140 mm. Servo main motor 30 kW, max running speed 30 m/min. Fits Q235 / Q345 steel. Great choice for small-size & thin-gauge C purlin jobs with limited workshop space and tighter budgets.
2. Medium-duty C100-300 Overall dimension:11800×2200×1930 mm, machine weight approx.18 tons. Forming stations:16 forming passes + stiffener pass + 2 shaping passes; roller shaft Φ75 mm, side-plate thickness 38 mm. Punch cylinder Φ125 mm, front-shear cylinder Φ160 mm. Servo main motor 30 kW, max running speed 30 m/min. Fits Q235 / Q345 steel. This is our popular all-round workhorse for regular steelstructure projects.
3. Heavy-duty C100-300 Overall dimension:14600×2200×1930 mm, machine weight approx.26.3 tons. Forming stations:20 forming passes + stiffener pass + 2 shaping passes; roller shaft Φ95 mm, side-plate thickness 43 mm. Punch cylinder Φ160 mm, front-shear cylinder Φ220 mm. Servo main motor 60 kW, max running speed 25 m/min. Handles thickness up to 4.0 mm and supports 550 MPa highstrength steel. Ideal for thickgauge work, solar-support purlins and heavy-load steel-structure projects.

Common specs across all grades: standard punching size 14×22 mm; cutting tolerance ±1 mm; 450H portaltype frame; hydraulic oil supplied free of charge. All units come with Siemens-Omron control system plus wireless remote controller.

Typical application scenarios: warehouse roof purlins, factory wall girts, pre-engineered building secondary frames, solar bracket components and large-span steel-workshop support parts.

Note: All parameters can be adjusted against your drawings, plate thickness and punching needs. Uncoiler is NOT included in standard scope and needs separate ordering.

Key Advantages of Automatic C Purlin Roll Forming Machine

1. High Production Output

Continuous coil-fed automatic workflow cuts manual work and delivers stable high-volume production. Max running speed hits 30 m/min. Thanks to pre-punch design, you skip secondary hole-drilling procedures after profile forming.

2. Consistent FinishedProfile Quality

Progressive roll-forming plus PLC control keep uniform web height, flange width and hole positions for every batch. Cutting tolerance reaches ±1 mm, so purlins fit perfectly during on-site assembly.

4. Flexible Production Capacity

You can produce multiple C purlin sizes by changing roll tooling or adjusting forming-station spacing. This pre-punch automatic C purlin machine supports single bottom hole, double-bottom holes and double-flange holes, coping with diverse project orders.

5. Lower Labor Cost

Uncoiling (optional), punching, forming and shearing run automatically. One single operator can manage the whole production line. Wireless remote controller simplifies daily operation and reduces human-caused mistakes.

6. Reliable Structural Performance

Mass-produced C purlins own stable load-bearing capacity. Our heavy-duty grade works well for high-strength thick steel to boost overall building rigidity and construction safety.

How To Pick The Right Automatic C Purlin Roll Forming Machine

1. Confirm WebHeight & Flange Size

Match machine grade with your regular job sizes. Pick light-duty C80-300 for web height 40-80 mm; choose medium-duty or heavy-duty for web height 45-100 mm. For special non-standard profiles, go for custom-built solutions.

2. Match Plate Thickness & Steel Yield Strength

-For plate ≤3.0 mm with Q235 / Q345 steel: light-duty or medium-duty models work fine.

-For plate 3-4.0 mm or 550 MPa high-strength steel: you must select heavy-duty C100-300. Thick material demands stronger forming stations, larger shafts, thicker side plates and higher-power drive. If your requirement exceeds standard-model limits, take custom-built lines into consideration.

3. Provide Your Exact Profile Drawings

Mark clear dimensions for web, flange, lip, hole size & hole spacing. This helps our team work out accurate machine proposals and avoid custom-made deviations. Think over whether you need pre-punch function: prepunch gives better hole precision than post-forming punching.

4. Clarify Your Punching Requirements

This automatic series comes with built-in hydraulic prepunch. It supports single bottom hole, double bottom holes and double flange holes, standard hole size 14×22 mm. Punching on flat steel ensures neat hole openings without profile warping. Special non-standard hole patterns can be custom-engineered.

5. Set Proper Production Speed

Light-duty & medium-duty max speed:30 m/min. For heavy-duty thick-gauge jobs, 25 m/min is recommended. Don’t blindly chase top speed when you process thick high-strength steel.

6. Pay Attention To Cutting-Tolerance Requirement

Our universal shear delivers ±1 mm cutting tolerance, better than common ±2 mm regular machines. It fits construction projects with strict length-precision demands.

7. Understand Automation Level

This is an automatic pre-punch C purlin production line. Standard package includes Siemens touch-screen, Omron encoder and wireless remote controller for easy parameter setup for size, punching and cutting length. If you need one-touch switching between C-profile and Z-profile, look at our CZ purlin roll forming machine.

8. Plan Your Uncoiler Option

Uncoiler is not included in standard scope. Choose low-cost non-power cantilever uncoiler for simple jobs; select hydraulic expansion uncoiler for heavy steel coils that need tight inner-hole gripping.

9. Evaluate Supplier Experience & After-Sales Service

Work with manufacturers with solid cold-roll-forming experience, who can offer overseas installation, operator training and full spare-parts supply. They also need capability for custom-built roll-forming lines for special drawings.

10. Balance Budget & Return On Investment

Balance upfront investment, output improvement, labor saving, raw-material reduction and long-term maintenance expense to get your most cost-effective setup. For custom-built projects, we evaluate your drawings first then offer proposal & quotation.

If your projects require both C-purlin and Z-purlin output, check our CZ purlin roll forming machine for flexible dualprofile switching. If you feel confused over configuration, feel free to contact our professional team for free custom suggestions.

Price Factors & ROI Calculation

The cost of an automatic C purlin roll forming machine depends on these key points: machine grade (light / medium / heavyduty), max-webheight & plate-thickness capacity, number of forming stations, hydraulic punching setup, shear type, PLC brand, automation level, optional uncoiler and custom-engineering requests. Ocean freight and on-site installation also change final quotation.

Light-duty units come with lower entry-level price. Heavy-duty machines have higher hardware specs to handle thick & high-strength steel. Custom-built roll-forming lines are priced after drawing review. To calculate real ROI, work out expected daily output gain, labor cost saved, material waste reduction, energy consumption and annual maintenance expense.

To get factorydirect quotation tailored for your production, please contact us.

Basic Machine Maintenance Tips

Good daily maintenance extends machine service life and keeps longterm profile accuracy.
-Lubricate bearings and moving parts following manufacturer’s schedule.
-Clean forming rollers and guide surfaces every day to avoid steelsurface scratches.-
-Regularly inspect punching dies and Cr12MoV shear blades; replace or sharpen wornout parts timely.
-Check hydraulicoil level and filter elements, replace hydraulic oil as scheduled.
-Backup PLC parameters on a regular basis to prevent data loss.

If you need full maintenance manual or professional troubleshooting help, please contact our technical support.

Frequently Asked Questions

Q1: What is an automatic C purlin roll forming machine used for?

A: It is professional cold-forming equipment to mass-produce C-shape steel purlins. Finished purlins act as roof purlins, wall girts and secondary structural supports for residential, commercial and industrial steel-building & solar-bracket projects. Our pre-punch automatic unit works especially well for orders requiring large quantities of pre-drilled mounting holes.

Q2: What thickness can an automatic C purlin machine process?

A: Light-duty & medium-duty:1.5-3.0 mm; heavyduty:1.5-4.0 mm and supports 550 MPa high-strength steel. Actual thickness limit depends on full-line rigidity including rollers, shafts, cylinders and drive motors. For thickness beyond standard range, custom-built roll-forming lines are available.

Q3: Can one automatic C purlin machine produce multiple sizes?

A: Yes. You can adjust machine parameters or swap roll tooling to make different-web-height C purlins within its designed range. Light-duty C80-300 covers web height 40-80 mm; medium-duty & heavy-duty C100-300 cover 45-100 mm. For sizes outside this scope, we can build custom-built equipment.

Q4: What is the difference between pre-punch C purlin machine and CZ purlin roll forming machine?

A: Our automatic pre-punch C purlin roll forming machine focuses purely on C-profile production. It punches holes on flat steel strip before forming and delivers high hole accuracy with ±1 mm cutting tolerance. It fits jobs dominated by C-purlin with many prepunchedhole requirements. A CZ purlin roll forming machine can switch between Cprofile and Zprofile, yet most CZ models adopt postforming punching. If most of your orders are C purlins, pick pre-punch C-machine. If you frequently mix C & Z orders, choose CZ combined unit.

Q5: How much does an automatic C purlin roll forming machine cost?

A: Prices vary with machine grade, processing capacity, punching setup, optional accessories and after-sales package. We provide factory-direct quotations after reviewing your profile drawings and production requirements.

Q6: How do I choose the proper automatic C purlin forming machine?

A: Start from your webheight dimension, plate thickness, steel yield strength, punching needs and daily output volume. Select light / medium / heavy-duty accordingly; go for custom-built solution for special drawings. Decide whether you need an extra uncoiler. Evaluate machine specs and manufacturer after-sales service. You can also contact our engineers for professional configuration advice.

Related Reading & Next Steps

Read our other technical guides for related forming-machine solutions: Z purlin roll forming machine, CZ purlin roll forming machine. You may also visit our C purlin machine product page to check full specs and real-world project references.

Looking for a Reliable Automatic C Purlin Roll Forming Machine?

Xiamen Zheng Liming is an experienced cold rollforming machine manufacturer focusing on purlinmaking lines. We supply lightduty / mediumduty / heavyduty automatic prepunch C purlin roll forming machines plus custombuilt rollforming lines for global steel fabricators and prefab construction partners. We tailor each line to match your drawings, material thickness and automation expectations.

✅ Free technical drawing evaluation
✅ Factorydirect pricing
✅ Overseas installation & operator training
✅ 12month warranty for core machine components

Check more product details on our product page, or contact us for your latest quotation.