The importance of the automatic screw tightening technique in industrial applications
If you ever worked in an industrial setting, you would have noticed that during the production of goods that require screw tightening, this part of the process is always a pivotal part of the production.
Tightening technically involves trying to achieve the proper clamp force around a joint. This clamped force helps the product to function properly without coming apart. If you understand the tightening technique of your products, you will know that this is important to get the proper right clamping force for your products. This goes a long way to ensure the quality of the product.
Screw joint in industrial applications
Screw joints are commonly used in industrial settings to join components together. This is because of the ease in which they are designed and assembled. They are also easy to dissemble while ensuring optimal productivity at the end of the process.
The screw tightening Process
The process of tightening your screw majorly affects the eventual integrity of your screw joints. Tightening is done to get a sufficient clamping force sufficient to hold the screw joint together. The process that will produce the proper clamp force with the best joint quality can be determined in different ways.
The different methods of applying torque
Operators in an industrial setting often perform their hand screw tightening operation with the use of the torque wrench. This wrench is used to set a predefined screw torque value. The operator is usually notified as soon as the needed torque is achieved. The benefits of using this solution are the simplicity in setting up and ease of use.
However, it has its downsides too. When you use this method, your productivity becomes low while you have limited control of your tightening capabilities. These downsides are experienced even if you have the most sophisticated wrenches.
Tools which have the continuous drive (known as driven tools) can be driven with both be driven either pneumatically or electrically. The pneumatic tools usually shut off through the mechanical clutch each time they reach the set torque. With the electric tools, there is a sensor control which monitors and controls the torque, gradient, and the angle. If you can control and measure the parameters there will be increased confidence in this process.
The method which involves the discontinuous drive uses the inertia method that gets released intermittently when performing the tightening operation. This mechanism is employed in pulse and impact tools.
The benefits of this method for your production process includes a fast tightening process to boost productivity. It has a minimal level of disadvantage but will not be much of a problem if you use the tools which have sensors.
The right procedure for industrial fastener tightening processes
The desired outcome of tightening the fastener works to obtain the right clamping force between the parts of your products. This clamping force is used to prevent the device from loosening and coming apart each time it is being used.
One thing about fasteners is the fact that they all come with specific torques. The method that is applied to a specific product/application is usually determined by a set of engineering calculations. They are then specified in the product. It is necessary to use the right fastener torque for the right fastener in your work line. If the torque is wrongly applied, it can lead to a damaged fastener, poorly finished components, or the provision of a clamp load that is not sufficient.
In industrial settings, we usually have three different methods in which tightening fasteners are specified. They are:
• The Torque method, denoted as (T),
• The Torque plus the Angle denoted as (TA),
• The Torque plus the Angle-to-Yield denoted as (TAY). The process is also known as the Torque-to-Yield (TTY).
The Torque method
Most fasteners that come with torque specifications are generally tightened with the use of a standard wrench. In general, fasteners that are threaded externally, like the studs, screws, and bolts which are tightened using this specification method could be used all over again. If not, this is specified in the bolt/screw/stud service information.
The Torque + Angle method
Any fastener which is specified as the torque + the angel has to be firstly tightened using the torque part specified. It is then further tightened by adding the angle specified. This angle is usually applied with respect to the mating surface or the mating fastener. In some cases, you get to use a backup wrench to help prevent the mating fastener from rotating.
Any externally threaded fastener which has been tightened using this method of specification, it could be used all over again unless it is noted with the service information.
The Torque + Angle-to-Yield method
Any fastener that comes with this specification is tightened similarly to what is notified just like the torque and the angle specification. The difference between the T and the TA tightening method is that the externally threaded fastener becomes permanently deformed.
Any externally threaded fastener that is fastened with this method specified should not be used again. They are generally changed and replaced if they come loose.
The different stages of tightening in industrial applications
In general, tool service information is used to indicate the specification for the fastener tightening process. A certain fastener that comes with a specific torque is usually tightened with the torque specified in a single pass.
However, in the case of both the torque/angle and the torque/angle/yield specification, there are stages involved in the fastening process. All fasteners get tightened to the torque specified in the first pass. Then in the second pass, they get another tightening which is specified to an angle. In some cases, you need over two passes. For you to get the right fastening process, you should use the right tool service information as a guide.
In devices which you have more than a single fastener, like in cylinder head bolts or wheel nuts, the fastener is tightened to a given specification. This is done through alternating between fasteners to make sure that the fasteners have an even torque. They are also used to prevent the fasteners from becoming distorted. The moment that you get to the specified minimum torque for every bolt, they are then completely tightened to the given specification.
It is necessary to get the right torque for your fasteners. This is what determines the quality of your joints, and ultimately determines the product durability. Most screw tightening machines are used to achieve the torque specified in most screw tightening processes. The screw tightening machine has the in-built capability to tighten your screw/fastener according to the right specification.
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