Forged Eyebolt

Process flow

The core of manufacturing the Forged Eyebolt is "Hot Forging", which reshapes the internal crystal structure of the metal, thereby endowing the products with outstanding strength and durability. The following is the complete process flow:

（1）Selecting High-Quality Raw Materials

Different standards have specific regulations for materials

（2）Precise Cutting

According to the Forged Eyebolt specifications required by the customer, the raw materials are precisely cut into short blocks of a certain volume through calculation.

（3）Material Heating

The cut steel billets are sent into the induction heating furnace and heated rapidly to approximately 1150°C. The steel billets turn into a glowing orange state. The high temperature makes the metal soft, facilitating shaping.

（4）Key Process: Hot Forging

This process completely reshapes the internal structure of the metal, making it denser and stronger. The entire process is usually completed in one impact on a press with a capacity of 2000 tons.

Pre-forming: Through processes such as forward extrusion, the heated billet is subjected to initial volume distribution and rough shaping.

Final Forging: The pre-formed billet is placed into a precise closed die that precisely matches the shape of the final product. Under immense pressure, the ring-shaped head and the tapered rod section of the bolt are forged in one go.

（5）Edge Trimming

After the final forging, the bolts usually have flash (excess burrs) which need to be removed.

（6）Heat Treatment

After forging, the Forged Eyebolt must undergo heat treatment to achieve the required strength and toughness.

Normalizing: Heat the forging to a specific temperature and then cool it slowly in the air to refine the grain structure and achieve a uniform microstructure.

Quenching and Tempering / Q+T: This is a crucial process for high-strength bolts (such as those with a grade of 8.8 or above).

Quenching: Heat the bolts to approximately 850-900°C and then rapidly cool them in oil or water to achieve extremely high hardness.

Tempering: The bolts that have undergone quenching are extremely hard and brittle. Subsequently, they need to be reheated to approximately 425-500°C for tempering to enhance their toughness.

（7）Thread processing

The threads are processed using the Thread Rolling technique.

（8）Surface Treatment

To prevent corrosion and enhance the appearance, the finished bolts will undergo surface treatment.

（9）Quality Inspection

Material Inspection: During the incoming inspection, the chemical composition and mechanical properties of raw materials are tested.

Dimension and appearance inspection: Check all the size tolerances of the Forged Eyebolt and inspect the surface for any defects, such as cracks or burnt areas.

Mechanical performance test: Conduct tensile tests to measure tensile strength and yield strength; as well as hardness tests.

Safety load test: Conduct Proof Load test, Breaking Test and Fatigue Test on the finished products.

（10）Packaging and Delivery

Products that pass all tests will be packaged as per requirements and accompanied by quality documents including batch numbers and test reports before being delivered.