How are bolts made? What is the role of cold-forging and heat treatment?

_Making of the bolt
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  • Bolts are considered as the fundamental components without which engineering and construction remain incomplete. This is the major reason why fasteners manufacturers in Australia follow the advanced and high tech approach. This approach has multiple steps. So the following information is very crucial as it is based on the frequently asked questions to the fastener manufacturers.

    DOES A DIFFERENT TECHNIQUE AND APPROACH IS USED EACH TIME THE VARIATION IN THE SIZE CAN BE FOUND OUT?

    No matter what the size or the shape of the bolts, the basic process remains the same. Beginning by bringing the right shape to the steel wire with the cold forging process. Carried forward by the steel heating process, the strength and durability are enhanced. Then the shipment pacing is carried out. If we talk about the advanced bolt designs, the additional steps keep on getting added with the expansion of the production process.

    Do you know?

    We are one of the leading manufacturers of bolts. We have good designs for the variegated bolts. Apart from that the quality which we bring is highly promising as we are sure of your work done.

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    HOW DOES COLD FORGING COMMENCE?

    Cold forging is the process that commences with the rods which are made up of large steel wire.

    Do you know?

    The steel grades have been standardised in the country as per ISO-898-1.

    Based on the special tooling, the tight shape is achieved by carrying out the cold forging process. At this point, the steel is moulded. But if we talk about the room temperature, then the series is accountable for getting killed with the highest pressure.

    HOW CAN THE TOLLING BE COMPLEX?

    The tolling can be highly complex which may contain so many different parts. Their number could reach 200. Once these are perfected, then the cold forging process is responsible for the quick production of the bolts. The large volumes and the high uniformity are what is desired after the process.

    WHAT IF I WANT THE MOST COMPLEX DESIGN? WILL THE PROCESS BE THE SAME?

    If it is about the increased complexity in the bolt designs, then these cannot be contoured with the help of the cold forging alone. Rather some additional turning and drilling will still be required.

    WHAT DO WE KNOW BY THE TURNING?

    By turning we mean the spinning of the bolt at high speed. But the steel will be cut away to achieve the required shape and design. The bolt will then encounter the holes which will be made by the drilling. If it is essential then the bolts could also get an addition of the washers.

    WHAT IS THE HEAT TREATMENT?

    Heat treatment is nothing but the standard process which helps in making the bolts to the extreme temperatures so that the steel can get hardened.

    HOW IS THREADING APPLIED?

    Much before the heat treatment gets commenced, threading is applied. There are two methods by which you can apply it. Either you can take the rolling technique into account or the cutting technique.

      • ROLLING

    Rolling is a technique that works the same as cold forging. This involves shaping the bolt by making it run through the die. Afterwards, the steel will be moulded into the threads.

      • CUTTING

    When it is about the cutting, then the threads will be formed either by cutting or removing the steel.

    HOW DOES HEAT TREATMENT HELP IN THE COST-EFFECTIVE APPLICATION OF THREADING?

    As the heat treatment is responsible for changing the properties of the steel, it contributes to the easy and cost-effective application of the threading.

    Do you know?

    You will experience better fatigue performance if threading is done after the heat treatment.

    WHY DO CUSTOMERS DEMAND THREADING AFTER HEAT TREATMENT?

    There is a high probability of experiencing minor damage and heat marks after the heat treatment. For this reason, customers usually demand the application of the threading after the heat treatment.

    IS THREADING AFTER THE HEAT TREATMENT MAKES IT A MORE EXPENSIVE PROCESS?

    This process becomes even more expensive because it needs the emergence of the hardened steel at the maintenance of the threads.

    WHEN DOES THE HEAT TREATMENT MAKE STEEL TO GET REVERTED TO THE ROUND SHAPE?

    If the length of the bolt is more than ten times more than the diameter of the bolt, only then the heat treatment can revert the steel to the round shape.

    HOW DOES THE CHOICE OF THE SURFACE TREATMENT IS DETERMINED?

    To determine which surface treatment will be chosen, the application of the bolt and the requirement of the customer is taken into the account.

    WHY IS THE ELECTROLYTIC TREATMENT CARRIED ON THE BOLTS?

    Usually, corrosion is the main problem experienced by the fasteners, therefore zinc plating will be applied. Usually, for the application, the electrolytic treatment is taken into account.

    In this process, not is submerged in the liquid which contains zinc. Then the electric current will run over it. It helps in the formation of the zinc coating.

    WHAT ARE ZINC FLAKES AND HOW IS IT BETTER THAN HYDROGEN EMBRITTLEMENT?

    As far as the electrolytic treatment is concerned, then there is an increased risk of getting encountered with hydrogen embrittlement. To get rid of that, zinc flakes are used. These are accountable for coming across with the higher corrosion resistance.

    WHAT IF THE CORROSION RESISTANCE IS NOT PROBLEMATIC?

    In case, corrosion resistance is not an issue, then the use of phosphate is one of the brilliant cost-effective options. No sooner than the surface treatment is applied, the bolts in the standardised form get prepared to be packaged up. But if you are considering the advanced designs, then their assembly could take more time such as brackets. Not only this but the bolts also require patching. The patching could either be a locked patch or the liquid patch.

      • LOCK PATCH

    To improve the gripping the threads will be covered with the nylon layer.

      • LIQUID PATCH

    The thread forming torque could significantly be improved with the patching technique.

    FINAL COMMENTS

    Once all the steps are performed, then the bolt is finished. Now what remains, at last, is the quality control which helps with the uniformity and the consistency insurance. This quality control is necessary to be done before packaging.