The Friction Bolts Machine is a professional roll forming production line designed for manufacturing high-strength pipe seam rock bolts used in underground support systems. It continuously transforms steel strips into slit friction bolts with stable dimensions, excellent strength, and reliable support performance. Today, friction rock bolts are widely used in mining tunnels, underground engineering, slope reinforcement, and geotechnical stabilization projects. Therefore, manufacturers require efficient and precise production equipment capable of meeting large-scale industrial demands. Compared with traditional fabrication methods, the automated friction bolt forming line improves production efficiency, reduces labor costs, and ensures consistent product quality.
By combining unwinding, leveling, roll forming, sizing, cutting, and control systems into one integrated production process, the machine achieves continuous and stable manufacturing while minimizing material waste
How the Friction Bolt Forming Process Works
The production process starts with steel coils prepared according to the required width and thickness. First, the steel strip is loaded onto the unwinding system and guided smoothly into the leveling device. The leveling rollers remove internal stress and improve strip flatness before forming begins.
Next, the material enters the roll forming section. Multiple precision rollers gradually bend the strip into a round tube profile while simultaneously creating a longitudinal slit structure. During this stage, the forming rollers ensure dimensional consistency and stable shaping performance.
After forming, the tube passes through the sizing and straightening system. This section controls the bolt diameter, straightness, and roundness to guarantee high-quality finished products. Then, the hydraulic cutting device automatically cuts the friction bolts according to the preset length without interrupting continuous production.
Finally, the finished rock bolts are transferred to the collection table for stacking and further application processing.
Main Technical Parameters of the Friction Bolts Machine
| Project | Parameter |
|---|---|
| Diameter Range | Φ32–50 mm |
| Speed Regulation | Transducer Control |
| Working Efficiency | 7–9 m/min |
| Reducer | 400 |
| Main Machine Power | 15KW-6 |
| Hydraulic Motor Power | 4.0KW |
| Voltage | 380V, 50HZ/60HZ, 3 Phase |
| Optional Voltage | 415V / 450V / 600V |
Typical Specifications of Rock Bolts
| Item | SS-33 | SS-39 | SS-47 |
|---|---|---|---|
| Bolt Diameter (A) | 33 mm | 39 mm | 47 mm |
| Bolt Length (B) | Can be tailor made | Can be tailor made | Can be tailor made |
| Taper Diameter (C) | 28 mm | 30 mm | 38 mm |
| Taper Slot Width (D) | Can be tailor made | Can be tailor made | Can be tailor made |
| Taper Length (E) | 60 mm | 65 mm | 65 mm |
| Slot Width (F) | 13 mm | 16 mm | 22 mm |
| Steel Strap Thickness (G) | 2.3 mm | 2.3 mm | 3.2 mm |
| Ring Wire Diameter (H) | 6 mm | 6 mm | 8 mm |
Main Components of the Friction Bolt Production Line
The complete production line includes several important systems working together to achieve efficient and stable operation.
The unwinding rack supports and releases steel coils smoothly during continuous production. Meanwhile, the guiding and leveling device ensures the steel strip enters the forming section accurately and steadily.
The roll forming unit is the core part of the machine. Multiple roller stations gradually shape the material into a circular slit tube profile with high forming precision. Afterward, the sizing and straightening device corrects deformation and guarantees stable bolt dimensions.
In addition, the hydraulic cutting system synchronizes with the production speed and cuts the finished products automatically according to the required length. The PLC electrical control system manages the entire line, including speed adjustment, parameter settings, operation monitoring, and fault alarms, making operation simple and efficient.
Advantages and Applications of Friction Bolt Machines
One major advantage of this machine is its continuous production capability. With a working speed of 7–9 meters per minute, manufacturers can achieve efficient large-scale production while maintaining stable product quality.
Furthermore, the machine provides excellent forming precision. It ensures accurate bolt diameter, slot width, straightness, and wall thickness, which are essential for underground support performance and installation reliability.
The production line also offers strong flexibility. By adjusting forming rollers and production parameters, manufacturers can produce various friction bolt specifications suitable for different engineering projects and geological conditions.
The finished friction rock bolts are widely used in coal mine tunnel support, underground mining, slope stabilization, hydropower projects, retaining systems, foundation pit reinforcement, and tunnel engineering. Because these bolts effectively stabilize fractured rock formations and reduce collapse risks, they have become essential support materials in modern geotechnical construction.
As global underground infrastructure projects continue to expand, the demand for high-quality friction bolt production equipment is steadily increasing. Therefore, investing in an advanced Friction Bolts Machine helps manufacturers improve efficiency, enhance product consistency, and strengthen competitiveness in the international market.
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