Mechanical Knowledge

Hot Forging&Warm forging

The hot forging manufacturing process enables the manufacture of highly customised parts with complex geometries due to the large amounts of plastic deformation and the consequent increased ductility and decreased strength of the workpiece. The high temperature guarantees excellent component integrity by distributing the material throughout the forged part and eliminating inclusions. All metallic materials (ferrous and non-ferrous) can be forged in hot condition and thus, hot forging process is the most common and well-known forging process.

The hot forging manufacturing process is performed at a higher temperature than the recrystallization point of the work metal, thus avoiding strain hardening. This induces that a full heat treatment is required on the parts after the forging, to optimize the metallurgical structure and obtain the required mechanical properties.

To limit large dimensional tolerances, and the generation of scale and surface contamination (such as decarburisation in steels, or H2 and O2 contamination in titanium alloys) a strict control of atmosphere furnaces is required. Solid metallurgical knowledge to adjust the forging and the heat treatment parameters and skills to design dies and preform tools for optimized grain flow are of critical importance. Therefore the Research and Development Engineering have tried to find different ways of forging (as cold and warm forging), aiming at decreasing the heating temperature.

However, hot forging remains the only available and high-quality manufacturing process for complex shapes, heavy-weight components and high-duty alloys. The forging division of Farina Group - Setforge masters the whole spectrum of forging techniques and provides a complete development of components, whether they are hot, warm, or cold forged. Setforge combines experienced manpower and state-of-the-art machinery to meet the forging needs of our diverse client base. Our strong, precise, reliable and cost efficient components are successfully applied in a wide range of industries among others aerospace, agriculture, energy, oil and gas. All Setforge process and main product lines are optimised with latest manufacturing solutions and treatments for improved material characteristics and better dimensional accuracy.

The warm forging
The warm forging manufacturing process occurs within the temperature range of 650 °C and 1000 °C, depending on the used material and the components type. This is usually above the work hardening temperature of the workpiece and below the temperature at which scale forms.

Warm Forged Common Rails

If the forging temperature is below the transformation point  of 740-770 °C, the material should undergo a preliminary heat treatment. This temperature range is used for parts with medium complexity which don’t require heat treatment after forging. For parts with greater complexity, the forging temperature is above the transformation point.

Although this temperature range is close to the one of hot forging, in terms of technology warm forging is rather similar to cold forging.

The warm forging process is placed somewhere between the cold and hot forging techniques, combining all their advantages as surface quality, precision, material usage and flexible shapes but generally requires high engineering skills (tools design, cooling, lubrification) and a dedicated forging press.

Warm forging is an important milestone of Setforge long-standing expertise in high-quality manufacturing. Performed as a single production technique or as an extension to cold or/and hot forging, our warm forging manufacturing process delivers mechanical components of premium quality.

Deshengrui Machinery is a professional CNC manufacturing and Sheet metal fabrication company, including CNC machining services, CNC turning service, CNC milling services, CNC drilling services, laser cutting services, stamping services, Die casting service, iron casting service and Steel Forging service.

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