What are the occurrence and types of forging surface defects in forging processing?
Dec 21 , 2021

Quality is a term used in industry to measure the standard of products, it indicates the level of technical requirements of the finished product.

For forging surface defects, there is a difference between forging surface defects in a broad sense and a narrow sense: The generalized forging surface defects are reviewed according to the ISO 9000 quality system, mainly include design quality, quality control of forging process, forging quality and quality traceability, etc. The narrowly defined forging surface defects mainly refer to the technical indicators that can be achieved by forgings, including technical indicators such as dimensional accuracy and weight deviation of parts, internal quality and surface quality of materials.

The quality of forgings is evaluated according to technical conditions or related standards, forgings must not only meet the requirements of the end user specified in the parts, but also meet the requirements of the intermediate links.

In actual production, according to the various degrees of forging design, divide the forgings into qualified parts, repaired parts, defective parts and waster.

Forgings that fully reach the manufacturing technical requirements are called qualified forgings, however, there may be good quality and poor quality in qualified forgings.
Forgings that do not reach technical requirements are require auxiliary processing or trimming, called repaired forgings, the repaired forgings can flow into the next process after going through the recycling procedures. Forgings that do not meet the technical requirements but can still be used in the future are called defective products.
If the forging does not reach the technical requirements and difficult to repair, and it is impossible to apply in the future, this forging is called waster. Waster parts should be scrapped and prohibited to flow into the next process.

The review of forging surface defects is a very complex and extensive work, can be commented according to the reason of the defect,  can be commented on the responsibility of the defect, it can also be described by the location of the defect, therefore it is necessary to classify it.

1.According to the defective process or quality defect produced in the production process, quality defect produced in the forging process and quality defect produced in the heat treatment process, etc.

2.Defects caused by raw materials. (1) Defects such as cracks, cracks, shrinkage holes, looseness, impurities, segregation, scars, bubbles, slag inclusions, blisters, folds, scratches, non-metallic inclusions, white spots, etc. (2) Defects such as longitudinal or transverse cracks and interlayers caused by raw material defects during forging. (3) Problems with the chemical composition of raw materials.

3.Defects caused by blanking are: Rough and uneven end faces, inclined end faces and insufficient length, end cracks, end burrs and interlayers, etc.

If you want to know more about forging surface defects, welcome to consult Nanjing Descaling Technology Co.,Ltd.:18952058568

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