Key Points of Forging Quality Control: Full-Process Control from Blank Selection to Finished Product Inspection

Key Points of Forging Quality Control: Full-Process Control from Blank Selection to Finished Product Inspection

The quality of forging directly determines the mechanical properties and operational safety of parts. It is necessary to run through the entire process from blank entry to finished product delivery. By accurately controlling key links, problems such as cracks, deformation, and substandard performance can be avoided. The following focuses on the core process and analyzes the key points of forging quality control.

Blank selection is the source of quality control. It is necessary to strictly verify the blank material certificate to ensure that the chemical composition and mechanical properties meet the design requirements, and avoid using low-quality materials with excessive sulfur and phosphorus content. At the same time, inspect the blank appearance and reject blanks with surface defects such as cracks, inclusions, and pores; control the blank dimensional accuracy and blanking tolerance according to the forging process requirements to prevent subsequent forming defects caused by dimensional deviations. In addition, the blank pretreatment link must be standardized. For example, uniform heating before hot forging requires controlling the heating temperature and holding time to avoid overheating, burning or uneven heating affecting metal plasticity.

Processing process control is the core of quality assurance. In the forming stage, it is necessary to accurately control the process parameters. For hot forging, stably control the forging temperature, deformation speed and deformation amount to avoid cracks caused by increased deformation resistance due to too low temperature, or coarse grains caused by too high temperature; for cold forging, strictly implement the blank annealing pretreatment, control the mold accuracy and pressure parameters to ensure precise part dimensions. At the same time, strengthen mold management, regularly check the mold wear, and repair or replace in time to prevent surface defects or dimensional deviations of parts caused by mold problems. In addition, it is necessary to monitor the cooling process after forging, and select natural cooling, air cooling or water cooling methods according to material characteristics to avoid internal stress caused by excessive cooling speed.

Finished product inspection is the key to quality release. Dimensional inspection requires the use of precision instruments to verify the shape, size and geometric tolerance of parts to ensure compliance with design drawings; surface quality inspection needs to check for defects such as cracks, folds and oxide scale residues, which can be combined with visual inspection, magnetic particle inspection or penetrant testing. Mechanical performance inspection requires sampling and testing indicators such as hardness, tensile strength and impact toughness of parts to verify whether they meet the use requirements; internal quality inspection can use ultrasonic testing and other means to check for hidden defects such as internal inclusions and shrinkage cavities. Unqualified products must be marked, isolated and analyzed for causes in a timely manner, and rectification measures should be formulated before they can be released after passing the inspection.

In summary, forging quality control needs to establish a full-process closed-loop management system and accurately control the three core links of blank source, processing process and finished product inspection. Only by strictly implementing quality standards in each link can high-quality forged parts be stably produced to meet the strict requirements of high-end fields such as automotive and aerospace.