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The YouYi Automation Products Center
All of YouYi's press automation solutions in one place.
Straightener/Leveling Machine
The SFL Precision Coil Straightener is designed for high-precision leveling of thin metal materials such as stainless steel, copper, iron, and aluminum. Equipped with precision-ground leveling rollers and a fine adjustment system, it delivers stable flatness and consistent leveling performance for coil materials from 0.2 to 1.2 mm thick.
Material width (mm): 100-500
Material thickness (mm): 0.2-1.2
Correction Speed (m/min): 15
Product Characteristics
The SFL Precision Straightener from YouYi Precision is designed for leveling thin metal coils with material thicknesses from 0.2 mm to 1.2 mm before stamping, punching, forming, and other precision manufacturing processes.
Thin metal strips can retain coil curvature and develop uneven deformation during coiling, handling, and unwinding. Because these materials are sensitive to roller pressure and surface contact, the straightening system must provide controlled adjustment and stable material movement.
The SFL series features a floating four-point fine adjustment system, fully driven leveling rollers, auxiliary support rollers, and precision-ground SUJ2 rollers. These features help control the leveling process and improve material flatness before downstream production.
The machine is suitable for processing stainless steel, copper, aluminum, galvanized steel, silicon steel, and cold-rolled steel. It can operate as a standalone straightener or be integrated with an automatic decoiler and servo feeder to form an automated coil feeding line.
The SFL series is specifically designed for thin metal materials with thicknesses ranging from 0.2 mm to 1.2 mm.
During coil processing, thin strips may retain coil set, curvature, or edge deformation after being unwound. The SFL leveling section applies controlled roller adjustment to correct these conditions and improve material flatness before stamping.
The final leveling result depends on material properties, incoming coil condition, machine setup, and the required flatness.
The SFL straightener uses SUJ2 bearing steel leveling rollers that are heat-treated to HRC 60, hard chrome plated, and precision ground.
This roller construction is designed to provide:
High wear resistance
Stable roller dimensions
Consistent contact with the material
Reduced risk of uneven roller wear
Reliable performance during repeated leveling operations
For surface-sensitive materials such as stainless steel, copper, and aluminum, roller condition and material handling are important considerations. Appropriate adjustment and regular cleaning and maintenance are also necessary to help minimize surface marking.
The SFL series incorporates a floating four-point fine adjustment mechanism with a dial indicator.
This system allows operators to adjust the leveling position according to material thickness and deformation characteristics. Controlled adjustment helps simplify machine setup when production requirements or material specifications change.
For thin metal strips, roller pressure must be set appropriately. Excessive pressure may cause unnecessary deformation, while insufficient adjustment may leave residual coil curvature.
The four-point adjustment system helps operators make controlled changes to the leveling position during setup.
Auxiliary support rollers are installed in the leveling section to support the main leveling rollers.
When thin metal strips pass through a straightener, roller deflection can affect the consistency of the leveling gap. The auxiliary support rollers help support the main rollers and maintain a more stable leveling structure under operating loads.
This design is particularly relevant when consistent material flatness is required across the strip width.
The upper and lower leveling rollers are fully driven to provide controlled material movement through the straightening section.
Compared with a system that relies mainly on material traction, the full-drive design helps reduce material slipping and inconsistent movement during leveling.
Stable roller movement is important when processing thin strips that require consistent contact with the leveling rollers before entering the downstream feeding process.
The integrated lubrication system supplies lubrication to key moving components, helping reduce friction and mechanical wear during operation.
Following the recommended lubrication and maintenance schedule helps maintain machine condition and supports stable operation over time.
The SFL precision straightener is designed for thin metal coil materials from 0.2 mm to 1.2 mm, including:
Stainless steel
Copper
Aluminum
Galvanized steel
Silicon steel
Cold-rolled steel
Other thin ferrous and non-ferrous metal strips
The actual machine configuration should be selected according to the material's thickness, width, tensile strength, yield strength, surface requirements, and required flatness.
For surface-sensitive materials such as stainless steel, copper, and aluminum, roller condition, leveling adjustment, and material handling should also be considered during equipment selection.
The SFL precision straightener can be used as part of an automatic coil processing and stamping line.
A typical configuration is:
Coil → Automatic Decoiler → SFL Precision Straightener → Servo Feeder → Stamping Press
The automatic decoiler unwinds the coil, while the SFL straightener corrects coil curvature and improves material flatness before feeding.
The servo feeder then controls the material feeding position and sends the strip into the stamping die according to the programmed feeding length.
This configuration allows decoiling, straightening, feeding, and stamping to operate as a continuous automated process.
In a precision electronics stamping application, an SFL precision straightener is integrated with an automatic uncoiler and a servo roll feeder.
The line processes thin stainless steel and copper coils with material thicknesses from 0.2 mm to 1.2 mm.
The production process is arranged as:
Automatic Uncoiling → Precision Straightening → Servo Feeding → Stamping
The automatic uncoiler provides continuous coil unwinding, while the SFL precision straightener improves material flatness before the strip reaches the servo feeder.
The servo feeder then provides controlled feeding into the stamping press.
This configuration is suitable for precision components used in areas such as 3C electronics, connectors, and small metal components, where stable material movement and consistent strip flatness are important.
Thin metal coils can be more sensitive to deformation during coil processing than thicker materials. Selecting an appropriate straightening system helps address several common production issues.
Coiled material naturally retains curvature after being unwound. The leveling rollers apply controlled deformation to correct this condition and improve strip flatness before downstream processing.
A flatter strip can provide more stable material movement when entering the servo feeder and stamping die. This is particularly important for precision stamping applications with narrow feeding tolerances.
The floating four-point adjustment system allows operators to make controlled changes to the leveling position instead of relying on a single adjustment point.
The SFL series uses precision-ground, hard-chrome-plated SUJ2 rollers and a full-drive roller structure to maintain controlled material movement during straightening.
The actual surface result also depends on material properties, roller condition, machine setup, and production environment.
Choosing a precision straightener should be based on the actual coil material and production requirements rather than material thickness alone.
The main factors include:
1. Material Thickness
The SFL series is designed for materials from 0.2 mm to 1.2 mm. The required leveling configuration should be determined according to the actual material thickness range used in production.
2. Material Width
Material width affects the required leveling roller configuration and machine capacity. The maximum strip width should be confirmed when selecting the machine model.
3. Material Type
Stainless steel, copper, aluminum, silicon steel, and galvanized steel have different mechanical and surface characteristics. These properties affect the required leveling adjustment.
4. Required Flatness
The required flatness of the finished strip should be considered together with the stamping process, part geometry, and downstream feeding requirements.
5. Production Speed
The straightener should be matched with the required feeding speed and stamping press cycle to ensure stable material movement throughout the line.
6. Coil Feeding Configuration
For automated production, the straightener should be matched with the appropriate decoiler and servo feeder.
A typical configuration is:
Decoiler + SFL Precision Straightener + Servo Feeder + Stamping Press
YouYi can configure the coil feeding system according to material specifications and downstream stamping requirements.
What thickness can the SFL precision straightener process?
The SFL precision straightener is designed for thin metal materials from 0.2 mm to 1.2 mm.
The actual machine configuration should be selected according to material type, width, mechanical properties, and required flatness.
Can the SFL straightener process stainless steel?
Yes. The SFL series can process thin stainless steel coils as well as copper, aluminum, galvanized steel, silicon steel, and cold-rolled steel.
For surface-sensitive materials, the material surface condition, roller condition, and machine adjustment should be considered together.
Can the SFL precision straightener correct coil set?
Yes. The leveling section is designed to correct coil set, curvature, and edge deformation in thin metal strips.
The final flatness depends on material properties, coil condition, leveling adjustment, and production parameters.
Why does the SFL use SUJ2 leveling rollers?
SUJ2 is a bearing steel commonly used where hardness, wear resistance, and dimensional stability are important.
The SFL leveling rollers are heat-treated to HRC 60, hard chrome plated, and precision ground for stable long-term operation.
Can the SFL straightener be connected to a servo feeder?
Yes. The SFL precision straightener can be integrated with a servo feeder and automatic decoiler to form an automated coil feeding line.
A typical production configuration is:
Automatic Decoiler → SFL Precision Straightener → Servo Feeder → Stamping Press
Can the SFL be used as a standalone straightener?
Yes. The SFL can be used as an independent straightening machine or integrated into an automated coil processing line.
The appropriate configuration depends on whether the production process requires manual material loading or continuous automatic coil feeding.
How do I choose the right SFL configuration?
The main selection factors include material thickness, material width, material type, tensile strength, required flatness, production speed, and the requirements of the downstream stamping process.
YouYi can recommend the appropriate straightener configuration based on your actual coil specifications.
YouYi Precision provides precision coil straighteners, decoilers, servo feeders, and automated coil feeding systems for stamping and coil processing applications.
For thin metal materials from 0.2 mm to 1.2 mm, the SFL series provides a dedicated solution for controlled straightening before precision stamping and feeding.
If you are selecting a straightener for stainless steel, copper, aluminum, or other thin metal coils, send us your material thickness, coil width, material type, and required production speed. Our engineers can recommend a suitable configuration for your application.
Technical Parameters
| Mode | SFL-100 | SFL-200 | SFL-300 | SFL-400 | SFL-500 |
| Material width mm | 100 | 200 | 300 | 400 | 500 |
| Feeding thickness mm | 0.2-1.2 | 0.2-1.2 | 0.2-1.2 | 0.2-1.2 | 0.2-1.2 |
| Correction speed m/min | 15 | 15 | 15 | 15 | 15 |
| Motor specifications HP | 1 | 1 | 2 | 2 | 3 |
| Coarse wheel diameter | Middle 30 | Middle 30 | Middle 30 | Middle 30 | Middle 30 |
| Number of coarse wheels | Up 9/Down 10 | Up 9/Down 10 | Up 9/Down 10 | Up 9/Down 10 | Up 9/Down 10 |
| Body weight Kg | 200 | 230 | 260 | 290 | 320 |
| Dimensions mm | 800x900x1250 | 800x950x1250 | 800x1000x1250 | 800x1050x1250 | 800x1100x1250 |
Application
1600 Large-Scale New Energy Lithium Battery Aluminum Casing Blanking Dedicated Automated Stamping Line
Thick-Sheet 3-in-1 Decoiler, Leveler & Feeder System for Automotive Stamping Applications
Customized Dual-Uncoiler 3-in-1 Feeding Line for Automated Stamping of Smart Furniture Hardware Components
2-in-1 Decoiler & Leveling Machines with Servo Feeders: Enhancing Precision in 3C Industry Automation
Ready to streamline your production with reliable stamping automation solutions that boost efficiency, reduce downtime!
Related Products
SNL Type Single/Two stage Precision Straightener (Thickness: 0.1-0.6mm)
SNL Type Precision Straightener is designed for leveling thin coil materials from 0.1mm to 0.6mm. Available in single-stage and two-stage structures, it ensures high precision and surface protection for stainless steel, copper, and aluminum strips
GJ Type High precision straightener (Thickness: 0.0.5-0.6mm)
High-Precision Design: Engineered specifically for stamping medium-thin materials requiring micron-level accuracy.
FJS Type high-speed straightener (Thickness: 0.3-1.5mm)
A high-speed precision straightener for 0.3–1.5 mm coil materials, featuring S-type material guidance and automatic speed synchronization for stable stamping and silicon steel processing.
HCL Type Heavy Duty Coil Straightener(Thickness: 1-6mm)
The leveling adjustment mechanism integrates a compact worm gear and worm wheel system, ensuring smooth torque transmission with reverse self-locking capability.
FAQ
Q: How do I determine the right feeder size for my production line?
A: The feeder size depends on the material width, thickness, and feeding step distance required by your stamping press. Choosing the correct specifications ensures smooth operation and prevents feeding errors or misalignment.
Q: What factors should I consider when choosing a servo feeder machine?
A: When selecting a servo feeder, key factors include feeding accuracy (±0.05mm or better), maximum feeding speed (e.g., 20m/min), material compatibility (stainless steel, aluminum, etc.), load capacity, and control system (PLC or touchscreen). Ensure the machine matches your stamping process requirements.
Q: How do I choose the right decoiler, straightener and feeder?
A: Select based on material type, width, thickness, coil weight, and required speed. Match decoiler capacity to coil size, choose a straightener for material strength, and a feeder that meets feed length and precision. Ensure compatibility with your press and automation level.
Q: Coil feeder vs servo feeder: what’s the difference?
A: A coil feeder is a broader system for continuous coil feeding, often integrated with decoiler and straightener. A servo feeder uses servo motors for precise, programmable feeding, ideal for short pitches and high accuracy applications.
Q: How to choose decoiler capacity?
A: Select a decoiler rated 10–20% above your maximum coil weight. Confirm inner diameter (I.D.) compatibility and outer diameter limits. Adjustable mandrels are recommended if you run multiple coil sizes.
Q: What feed precision can I expect?
A: Servo feeders typically achieve ±0.01–0.05 mm, with high-end models reaching ±0.005 mm. Mechanical feeders usually provide ±0.02–0.1 mm. Actual accuracy depends on material properties and straightening quality.
Q: How does material affect machine selection?
A: High-strength materials need stronger straightening and drive systems. Thin materials require low-pressure handling. Soft materials like aluminum need anti-scratch solutions.
Q: What affects feeding accuracy most?
A: Key factors include feeder precision, servo tuning, straightener setup, material quality, and press stability. Poor setup or worn dies can reduce accuracy.
Q: What spare parts should be prepared?
A: Common spares include bearings, belts, sensors, seals, guide blocks, and lubrication parts. Keeping key components reduces downtime and improves maintenance efficiency.
Q: Can feeders be retrofitted to existing presses?
A: Yes, most systems support retrofitting. Check press dimensions, feed height, control compatibility, and safety requirements before installation.
Q: How long does it take to receive the feeder machine after placing an order?
A: Lead time for delivery typically ranges from 4 to 8 weeks depending on customization, production schedules, and shipping location. Once your order is confirmed, we will provide a more precise delivery estimate.
Q: What are your payment terms?
A: We accepts T/T payment, 30% deposit and 70% balance before shipping
Q: How often should I perform maintenance on my servo feeder machine?
A: Routine maintenance should be conducted weekly for basic cleaning and lubrication, while a more thorough inspection should be done monthly to check for wear on rollers, belts, and electrical components. A full servicing is recommended every 6-12 months depending on usage intensity.
Q: What are the most common issues with feeder machines, and how can I troubleshoot them?
A: Common issues include misalignment, inconsistent feeding accuracy, or motor failure. Check for loose bolts, dirt buildup, or software calibration errors. If problems persist, refer to the user manual or contact technical support.
Q: Do you provide on-site repair services if my machine breaks down?
A: Yes, we offer on-site repair services for major issues, along with remote troubleshooting support for minor problems. For urgent cases, we can dispatch a technician within 24-48 hours, depending on your location.
Q: What is the maintenance cycle?
A: Daily cleaning and inspection; weekly check belts, air lines; monthly inspect bearings and guides; yearly replace worn parts. Adjust frequency based on operating hours and workload.
Q: What's the package of your coil feeding machines?
A: For the coil feeding equipment that go LCL shipping, We will use plastic films wrap on the equiment, and then fix it into a wooden box.
For the large coil lines that go FCL shipment, We will fix each part with ropes on the shipping container and then wrapped them with plastic films.
Q: What is the typical lead time?
A: Standard machines usually take 4–8 weeks. Customized systems or full production lines may require 10–20+ weeks depending on complexity and production schedule.
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