Equipment Overview
The BMW Window Frame Roll Forming Machine is a specialized cold-bending forming production line for producing window frame profiles for passenger car doors. The automotive window frame is a crucial component of the door system; its cross-sectional accuracy and geometric dimensions directly determine the smoothness of window glass operation, the matching quality of sealing strips, and the overall appearance quality of the door. Currently, automotive door window frames are generally made of cold-formed steel. The window frame profile is stretched and bent to form a spatial shape before being welded to the door.
This equipment uses a continuous cold-bending roll forming process, combined with online roll bending technology, to complete the entire process of feeding, guiding, roll forming, bending, and cutting in one go, directly producing finished automotive window frame profiles.
The entire line is fully automated with PLC control and a touchscreen human-machine interface. The entire process, from feeding to finished product output, is automated and continuous. The equipment uses a gate-type gearbox transmission structure, which is rigid, precise, and has a long service life. This equipment is suitable for various metal sheets, including cold-rolled steel and galvanized steel, with a thickness of 1mm. The forming speed is approximately 15m/min, and the number of forming passes is 10-12 (depending on the strength of the raw material). The entire line requires only 1-2 operators and is a core piece of equipment for automotive parts manufacturers to achieve large-scale, standardized, and intelligent production.
This equipment has successfully served high-end automotive brands such as BMW, providing them with high-quality cold-bending forming solutions for window frame profiles. The products are widely used in multiple mass-produced models.
Core Advantages and Selling Points
(1) Archway-Type Gearbox Drive: High Rigidity, High Precision, and Long Lifespan
The forming machine adopts an archway-type gearbox drive structure, which is the core advantage that distinguishes this equipment from conventional chain drive or wall-panel drive equipment.
The gearbox drive has significant advantages over chain drive, including smooth transmission, low noise, high precision, and long lifespan. The archway-type frame has high rigidity and good resistance to deformation, ensuring stable operation of the equipment under long-term, high-intensity conditions. The forming machine motor has a power of 5.5KW, with precise and controllable power, ensuring stable and efficient operation of 1mm sheet metal in 10-12 forming passes. The shaft diameter is Φ55 mm, machined and then ground to ensure the circular runout of the main shaft in each pass, laying the foundation for high-precision forming.
(2) 10-12-Pass Precision Roll Forming: Precise and Stable Cross-Sectional Dimensions
The forming machine adopts a 10-12-pass multi-pass progressive cold bending forming process (the specific number of passes depends on the strength of the raw material), gradually bending the metal sheet into the standard cross-section of an automotive window frame. Cold bending forming employs a die design system that shapes the blank from both sides towards the center, resulting in stable forming, a simple die design, and easy roll configuration and adjustment. The rolls utilize a combined roll design, facilitating assembly, adjustment, and product replacement.
Using cold-formed steel to produce automotive door and window frames offers significant advantages, including a rational cross-sectional shape, uniform hardness distribution, high dimensional accuracy, and light weight. Compared to traditional stamping processes, cold bending forming requires less initial equipment investment, offers higher production efficiency, higher material utilization, less product springback, stronger precision control, and more stable quality.
Rolling Thickness: 1mm, covering the thickness requirements of mainstream passenger car window frames
Rolling Material: Cold-rolled steel, galvanized steel, etc., with strong material adaptability
Shaft Diameter: Φ55mm (machined and then ground to ensure the circular runout of the main shaft in each pass)
Roll Material: D2 die steel, quenched (HRC58-62)
Roll Machining Method: CNC machining after heat treatment, internal hole grinding to ensure circular and radial runout accuracy
Length Precision: ±1.5mm, ensuring uniform finished product dimensions and stable quality
(3) Online Bending Mechanism (Roll Bending), One-time Forming without Secondary Processing
The equipment is equipped with an online bending mechanism (roll bending), which directly completes the curvature bending of the window frame profile after roll forming.
After cold bending, automotive window frame profiles need to undergo a stretching and bending process to form a spatial shape. This equipment integrates roll forming and roll bending into the same production line, completing the bending directly online after forming, eliminating the need for separate bending equipment, secondary clamping, and intermediate transfer. The bending process is fully automated, with precise and controllable curvature, perfectly matching the car door design.
(4) Hydraulic Cutting After Forming, Smooth Cut
The system employs hydraulic cutting after forming, using Cr12MoV shear blades that have undergone quenching treatment (HRC58-62). This ensures high cutting precision and a smooth cut, requiring no further processing. Finished products have uniform dimensions and stable quality, effectively guaranteeing on-site installation accuracy of the window frame.
(5) High-Efficiency Production, Leading Capacity
The entire production line integrates automated processes for feeding, forming, bending, and cutting. The forming line speed is approximately 15m/min, ensuring high efficiency and stability. Fully automated production requires only 1-2 operators, increasing efficiency several times compared to traditional segmented processing methods.
(6) Cold-Formed Steel Replaces Traditional Stamping, an Industry Trend
Cold-formed steel is widely used in the automotive manufacturing industry. In many car models, traditional stamped parts have been replaced by cold-formed steel components. In the load-bearing structures of trucks, cars, and buses, cold-formed steel is used as frames, main beams, longitudinal and transverse beams, the skeleton of the carriage, chassis, and side walls; in the interior trim structures, it is used as guide rails for side window frames and seat components. Using cold-formed steel to produce automotive door and window frames results in steel sections with reasonable cross-sectional shapes, high dimensional accuracy, and light weight.
(7) Fully Automatic PLC Control, Intelligent Production
Fully automatic PLC control with a touchscreen human-machine interface enables full-process digital management.
Operators can set parameters such as production speed, cutting length, and production quantity with a single click through the interface.
Multiple sets of part data tasks can be set at once for automated production.
Equipped with a real-time monitoring and early warning system, it automatically alarms and displays the cause of the fault in abnormal situations.
New operators can work independently after 1-2 days of training.
(8) Robust and Durable, Stable and Reliable
The machine bed is made of welded steel plates and undergoes tempering treatment to eliminate internal stress and prevent machine deformation.
The forming frame has a gate-style structure, offering high strength and long service life.
D2 quenched rolls (HRC58-62) offer high hardness, good wear resistance, and long service life.
Cr12MoV quenched shearing blades (HRC58-62) provide long service life and stable precision.
Key electrical components use internationally renowned brands, ensuring low failure rate and long service life.
Technical Parameters
Item | Parameter
Applicable materials | Cold-rolled sheet, galvanized sheet, etc.
Material thickness | 1mm
Forming machine structure | Arch-frame type with gearbox drive
Number of forming stations | 10–12 (depending on raw material strength)
Shaft diameter | Φ55 mm (machined and ground to ensure radial runout accuracy for each spindle)
Forming machine motor power | 5.5kW
Forming line speed | Approx. 15m/min
Roller material | D2 die steel, quenched (HRC 58–62)
Roller processing method | CNC machining after heat treatment; inner bore grinding
Bending method | Inline roll bending
Cutting method | Hydraulic cutting after forming
Shear blade material | Cr12MoV, quenched (HRC 58–62)
Cut-to-length accuracy | ±1.5mm
Control system | Fully automatic PLC control
Operators | 1–2 persons
Production Process
Uncoiling → Guided Feeding → Roll Forming (10–12 stages) → Arc Bending (Roll Bending) → Cutting → Discharge
Process Step | Description
Uncoiling | Load metal coil onto the uncoiler for stable material supply.
Guided Feeding | Lateral roller-type guidance directs the strip from both sides toward the center, ensuring precise entry into the main forming unit.
Roll Forming | 10–12 stages of progressive cold-roll forming (depending on raw material strength) using hardened D2 steel rollers to gradually shape the standard window frame profile.
Arc Bending (Roll Bending) | Inline roll bending to form the required arc curvature of the window frame profile in a single pass.
Cutting | Hydraulic cutting after forming using hardened Cr12MoV steel blades; precision ±1.5 mm.
Discharge | Output of finished products; orderly discharge.
Application Areas
The window frame profiles produced by our automotive window frame cold bending forming equipment are widely used in the following areas:
Passenger Vehicle Door Glass Window Frames: Door glass window frames for various sedans, SUVs, and MPVs—the window frame profiles are cold-bent, then stretched and bent to form a spatial shape before being welded and installed to the door.
Commercial Vehicle Window Frames: Window frames for buses, light trucks, and other commercial vehicles—cold-bent steel sections have a reasonable cross-sectional shape and high dimensional accuracy.
Window Guide Rails: Side window frame glass guide rails—cold-bent steel is used as guide rails for side window frame glass in the interior trim structure of the vehicle.
Sunroof Frames: Automotive sunroof frames—customized production of high-strength window frame profiles.
High-End Brand Support: Successfully served mainstream and high-end automakers such as BMW, Mercedes-Benz, FAW-Volkswagen, SAIC-Volkswagen, SAIC-GM, Volvo, and Jaguar Land Rover.
Market Prospects
With the continuous development of the global automotive industry and the deepening trend of lightweighting, the market for cold-formed automotive window frames is showing steady growth.
Cold-formed steel has huge application potential in the automotive industry: Cold-formed steel still has great market potential in the machinery manufacturing industry, especially in the automotive manufacturing industry. Cold-formed steel refers to finished steel products of various cross-sectional shapes formed by bending steel plates or strips in a cold state. It is an economical, lightweight, thin-walled steel material. In many car models, traditional stamped parts have been replaced by cold-formed steel parts. The automotive industry has become one of the largest users of cold-formed steel.
The cold-formed forming process has significant advantages: The cold-formed forming process features low initial equipment investment, high production efficiency, high material utilization, low product springback, strong precision controllability, and stable quality. Roll forming is a high-productivity, energy-saving, and material-saving sheet metal forming technology.
High-end brand demonstration effect: This equipment has been successfully used by high-end automotive brands such as BMW, and the products are widely used in many mass-produced models. The successful application of high-end brands provides strong quality endorsement and a market demonstration effect for the equipment. As more automakers adopt cold-formed steel to replace traditional stamped parts, the market demand for automotive window frame cold-forming equipment will continue to grow.
Continued growth in automobile production: As the world's largest automobile producer, China consistently ranks among the world's top producers and sellers. The continued growth in passenger vehicle production provides a stable market demand for automotive window frame cold-forming equipment.
Service Support
Solution Design: We provide customized equipment selection and production line layout based on customer product drawings, capacity requirements, and target markets.
Customized Manufacturing: We support non-standard customization. Customers can provide cross-sectional drawings or samples for customization. The entire process, from roll design to complete machine manufacturing, is under our control.
Installation and Commissioning: Engineers provide on-site installation and commissioning, and train operators to ensure rapid production.
After-sales Guarantee: Long-term technical consultation and spare parts supply. Engineers have complete certifications and can provide global on-site service at any time.
Continuous Optimization: We can provide equipment modification and capacity upgrade services according to changes in customer production needs.
Why Choose Us
Nearly 20 Years of Manufacturing Experience: Mature Technology, Perfected Processes, Reliable Quality
High-End Brand Verification: Successfully served high-end automotive brands such as BMW; product quality has undergone rigorous market testing.
Gearbox Transmission: High rigidity, high precision, long lifespan, smooth and reliable transmission.
10-12 Precision Forming Steps: D2 hardened rolls (HRC58-62), Φ55mm precision spindle, CNC + grinding machining.
Inline Integrated Bending: Roll forming and bending are completed simultaneously, eliminating the need for secondary clamping or independent bending equipment.
High-Precision Manufacturing: Length accuracy ±1.5mm, reasonable steel section shape, and high dimensional accuracy.
High-Efficiency Production: Line speed 15m/min, 1-2 people can operate the entire line.
Intelligent Control: PLC fully automatic + touch screen operation, one-button setting, automatic counting.
Cold-Formed Steel Industry Trend: Replacing traditional stamped parts, in line with the development direction of automotive lightweighting.
Source Factory: No intermediaries, high cost-effectiveness.
Global Service Network: Complete engineer certifications, rapid response.
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