Unpack the password for the forging quality improvement

As the core foundation component of mechanical equipment, the quality of forgings directly determines the service life and operation stability of the equipment. How to prevent the quality defects of forgings is the key to ensure the quality, performance, cost and efficiency of forgings.

In recent years, DHDZ Forging Process Materials Research Institute has deeply studied the causes and formation rules of forgings quality defects, and the proposed solution is of great significance to improve the quality of forgings in production practice.

The source of quality, the details determine success or failure

The impact of raw material defects on the quality of forgings runs through the whole life cycle of design, production and use. Through the source control of smelting process, the negative influence of defects on forging performance can be significantly reduced.

For example, the existence of the strip tissue steel uneven, and affect the performance of steel, form anisotropy, reduce the mechanical properties of steel and quenability, strong toughness, easy to form mixed crystal tissue and martentic tissue, make parts quenching deformation tendency to increase, increase the severity of gear deformation, affect the accuracy of the tooth heat, after the inner hole heat ellipticity increase defects.

Precision control, shape the perfect organization

The forging production process has a significant influence on the quality, if the forging temperature is not appropriate, the high temperature will cause coarse grain, overheating and burning, and reduce the strength and toughness, poor plasticity, and high deformation resistance. The distribution of forged streamline will also affect the thermal deformation degree of a product. The irregular streamline distribution is easy to aggravate the irregular deformation and quenching defects.

For example, the streamline of rotary products hopes to be distributed as centrosymmetrically as possible, the direction of the rear streamline is kept as consistent with the main stress direction as far as possible, and the shear stress direction is perpendicular to the fiber direction. For forgings such as gear blank, the rod material should be upheaded, so that the fiber is radial, which is conducive to the force of the gear.

Physical and chemical inspection, power quality analysis

From the raw materials into the factory to the forging factory, the inspection link throughout. Mechanical properties test, such as tensile and impact test, can determine the strength, toughness and other indicators of the forging, to determine whether they can withstand the specified load.metallographic test can observe the structure of forging and find abnormal grain size and non-metallic inclusions.

If the physical and chemical inspection is not strict, unqualified forgings into use, easy to cause equipment failure and even safety accidents. Strict and standardized physical and chemical inspection can provide reliable basis for the quality of forgings and ensure their safety and stability.

The improvement of the quality of forgings is the result of the collaborative optimization of raw materials, process and physical and chemical inspection. Through practice, DHDZ Forging shows that the internal quality and performance of forgings can be significantly improved by accurately controlling chemical composition, optimizing forging process, strictly controlling heat treatment parameters, and relying on advanced equipment and testing technology.