Questions You Should Know about steel rod rebar rolling machine

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.【/WeChat/Skype/】+86 136

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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.

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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.

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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 the 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

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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.【/WeChat/Skype/】+86 136

The answer is yes, however, there are several issues to consider to avoid liability. For this discussion, we will assume a requirement for threaded rebar as follows:

#8 x 48″ long A615 grade 60 rebar with 8″ thread one end.

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What is rebar?

Rebar is short for “reinforcing bar” and often used in concrete foundations to strengthen the concrete. It is held in place by systematic ridges or deformations in its surface that allow the concrete to “grip” the bar better than plain round bar. These deformations are a great asset in the masonry applications, but hinder the usefulness of rebar as a threaded fastener.

Rebar gauges (diameter of the bar) are measured in eighths of an inch. For example, #8 rebar is essentially 1″ diameter (8 x 1/8″ = 8/8″ or 1″).

Cut Threading Rebar

Why can’t you just put threads on rebar?

Rebar cannot simply be cut threaded to the nominal diameter. This is due to the diameter difference between the major diameter of UNC threads and the diameter inside the deformations. The diameter inside the deformations is less than the minimum allowable major thread diameter. This will lead to incomplete threads and the liability that comes with product not meeting dimensional tolerances. As an example, the diameter on #8 rebar between the deformations is .960 and the minimum allowed major diameter on 1″ threads is ..

How to properly cut thread rebar

The only way to correctly thread rebar is by turning down, or milling the end of the rod so that it is the proper size and shape to be threaded. This is done by removing the outer layer of the bar until the diameter is equal to the deepest deformation on the bar, leaving a smooth surface to thread. The smaller diameter of the threaded portion means that a larger size of rebar will have to be used and turned down in order to have threads that are the correct nominal diameter. If we go back to our example rebar above, we would need to use #9 rebar, instead of #8 in order to have proper 1″ UNC threads.

Things to keep in mind when ordering threaded rebar

In cases where plans call for threaded rebar, it is essential that the engineer or detailer specify the diameter of thread needed on the bar, since cut threading a #8 rebar will not result in a complete 1″ UNC thread. When thread type is not specified or ambiguous, Portland Bolt makes the assumption that the design requires a 1″ thread and when cut threading, will use a #10 bar to produce a fully functional 1″ – 8 threads per inch Unified National Coarse thread as opposed to cut threading a #8 bar which results in a 3/4″ – 10 thread per inch finished product.

Roll Threading Rebar

As opposed to cut threading, the threads on rebar can also be produced through a roll threading process. For the differences and limitations of roll threading versus cut threading, refer to our FAQ discussing roll threading versus cut threading. Keep in mind that roll threading equipment is limited in the marketplace and many companies that produce threaded rebar will not have the equipment available to roll threads. Most machine shops and smaller scale bolt manufacturing companies only have equipment that is capable of cut threading.

Unlike the cut thread example above, rebar can be turned to the pitch diameter (.912″ in our example using #8 rebar) and rolled back up to produce a fully functional, dimensionally correct 1″- 8 UNC thread. Since some roll threading equipment has diameter and length limitations, rolling threads on rebar is sometimes not possible. Again, the thread dimension in addition to the size of the rebar should be specified.

To specify threaded rebar properly, our inquiry for this example should read as follows:

#8 (1″-8 UNC) x 48″ long A615 grade 60 rebar with 8″ thread one end.

Contact us to discuss your requirements of Hydraulic Thread Rolling Machine. Our experienced sales team can help you identify the options that best suit your needs.