In modern construction projects, the reliable connection of steel bars is crucial, as it directly affects the overall safety and durability of the structure. At present, there are two main commonly used methods of connecting steel bars: one is the thread rolling connection using a steel bar thread rolling machine in conjunction with a connecting sleeve, and the other is the cold extrusion connection utilizing a rebar cold extrusion machine in conjunction with a connecting sleeve. These two methods have their characteristics. This article will explore in depth the working principles, advantages and disadvantages, and applicable scenarios of these two connection methods to help you make a more informed choice in actual projects.【WhatsApp/WeChat/Skype/Phone】+86 136 1385 6800
Rebar Thread Rolling Connection: Thread Bite, Stable and Reliable
Rebar thread rolling connection means first using a rebar thread rolling machine to roll out threads at the end of the rebar, and then using a connecting sleeve with an internal thread to tighten and connect the two rebars. This connection method is similar to the process of screwing screws in our daily life, and the tension and pressure of the rebar are transmitted through the bite force between the threads.
Rebar Threading Machine Technical Parameter:
| Model | YGS-40 | YGT-40 | YGA-40 |
| Processing diameter range | 16-40mm | ||
| Thread rolling length | 0-80mm | 0-80mm | 0-100mm |
| Power voltage | 4kw/380v 50hz | 4kw/380v 50hz | 7.5kw/380v 50hz |
| Working efficiency | 15s/forming | 8s/forming | One-touch auto forming |
| Machine weight | 320kg | 350kg | 400kg |
| Machine size | 115*50*106cm | 110*60*130cm | 126*70*106cm |
| Type | Standard type | Upgrade type | Full automatic type |
Advantages of Rebar Thread Rolling Connection:
- Strong versatility: Rebars of the same specification can be connected through standardized connecting sleeves, which is convenient for material management and construction.
- Relatively simple operation: The operation of the thread rolling machine is relatively easy to master, and construction personnel can take up their posts after simple training.
- Easy to check quality: The quality of the connection can be checked by tightening torque and other methods to ensure the reliability of the connection.
- Relatively low cost: The cost of the thread rolling machine and the connecting sleeve is lower than that of cold extrusion equipment and sleeves.
Applicable Scenarios for Rebar Thread Rolling Connection:
Rebar thread rolling connection is widely used in various construction projects, bridge projects, etc., especially in occasions where a large number of rebars of the same specification need to be connected.
Cold Extrusion Connection of Steel Bars: Plastic Deformation, Tight Combination
Cold extrusion connection of steel bars uses a cold extrusion machine to press the connection sleeve onto the ends of the two steel bars to be connected through high pressure, so that the sleeve is plastically deformed and tightly engaged with the surface of the steel bar, thereby realizing the connection of the steel bars. This connection method relies on the mechanical bond between the sleeve and the steel bar.
Technical Parameter of YG Steel Bar Cold Extrusion Press Machine:
| Model | YGJY-32 |
| Applicable rebar size | Φ16-Φ32mm |
| Working stroke | 45mm |
| Pressure | 63Mpa |
| Motor power | 4kw/380v |
| Weight | 120kg |
| Oil pump size | 800*600*800mm |
| Squeeze clamp size | 500*170*200mm |
Advantages of Cold Extrusion Connection of Steel Bars:
- High connection strength: Cold extrusion connection can usually provide a connection strength equivalent to or even higher than the strength of the steel bar parent material.
- Stable connection performance: The connection quality is less affected by human factors, and the connection performance is more stable and reliable.
- No heating required: The connection process is carried out at room temperature without changing the material properties of the steel bar.
- Wide range of applications: It can be used for connecting steel bars of different diameters and grades, and can even connect steel bars that cannot be welded.
Applicable Scenarios of Cold Extrusion Connection of Steel Bars:
Cold extrusion connection of steel bars is particularly suitable for projects with high connection strength requirements, such as steel bar connections in key parts such as high-rise buildings, bridges, tunnels, and steel bar connections at low temperatures or in environments where welding is not allowed.
Thread Rolling Vs. Cold Extrusion: The Main Differences
| Features | Steel bar thread rolling connection | Cold extrusion connection of steel bars |
| Connection principle | Thread bite | Plastic deformation of connecting sleeve, mechanical bond strength |
| Equipment | Steel bar thread rolling machine | Cold extrusion machine for steel bars |
| Connection sleeve | Internal thread | The inner wall is usually smooth |
| Rebar pretreatment | Need to roll the thread at the end of the steel bar | Usually not required (rib stripping may be required in special cases) |
| Connection strength | Meet the engineering requirements | Usually higher |
| Quality inspection | This can be checked by tightening torque and other methods | Mainly depends on appearance inspection and process control |
| Applicability | Connect steel bars of the same specification, lower cost | Connection of steel bars of different specifications and grades, high strength requirements, and environmentally restricted occasions |
| Construction speed | Quicker | Relatively fast |
| Cost | Relatively low cost of equipment and sleeve | Relatively high cost of equipment and sleeves |
Conclusion: Choose the Most Appropriate Rebar Connection Method According to Your Needs
Both steel bar rolling connection and steel bar cold extrusion connection are important steel bar connection methods in modern construction projects. They have their advantages and are suitable for different engineering needs and scenarios. In actual projects, it is necessary to reasonably select the appropriate connection method based on the specific requirements of the project, the construction environment, and the cost budget to ensure the quality of the steel bar connection and the smooth progress of the project.
I hope that the introduction in this article can help you better understand these two steel bar connection methods and make the right choice in actual projects to ensure the quality and safety of the project. If you have any questions or needs about the steel bar connection, please feel free to contact us and we will provide you with professional solutions.【WhatsApp/WeChat/Skype/Phone】+86 136 1385 6800
