Methods for Quality Inspection of Forged Parts
Forgings are widely used in many industrial areas such as automotive, aerospace, energy, ships, and buildings. Because of their complex three-dimensional shape, properties, and production process, they have very strict requirements on the quality of forged parts. Quality inspection and management of these parts is extremely important to ensure their quality and application performance. This article will introduce the concepts and methods commonly used in the quality inspection of forged parts.
Definition
The inspection of the quality of forgings is to detect or measure the metallurgical structure, mechanical properties, dimensional tolerances and surface and tolerance conditions of forgings in accordance with the relevant technical requirements, and determine whether it meets the agreed quality standards.
Category
The quality inspection of forgings can generally be divided into two categories:
(1) Non-destructive testing of forgings: including hardness test, magnetic particle test, eddy current test, ultrasonic test, radiographic test, and dye penetrate test, etc. All these tests do not damage the material, components, parts and components of the forgings under inspection.
(2) Destructive testing of forgings: destructive testing is an important means of testing the performance of forgings. In this test, part of or all of the sample is sampled and tested to determine the mechanical properties of the material. Generally, tensile test, impact test, fatigue test, fracture test and fatigue fracture test are used.
Preparation
In order to ensure the accuracy of the inspection results, it is necessary to properly prepare the sample in advance. It is necessary to clean the parts to be inspected, and then an evacuated sample should be selected for inspection. The sample size and sample temperature should be determined according to the inspection requirements, and the specimen should be carefully protected to avoid damage during transportation. In addition, it is necessary to pay attention to the thermal stability of the part before inspection.
Inspection Method
Inspection methods generally include physical inspection, chemical inspection and instrument testing.
1. Physical inspection. Visual inspection can accurately and directly capture some simple appearance defects such as burrs, cracking, piping, surface defects, wrinkles, and local mechanical damage.
2. Chemical inspection. Chemical analysis is a test of the chemical composition of materials, which is the basis of judging the performance of materials and components. The commonly used chemical analysis method is X-ray fluorescence spectroscopy.
3. Instrument inspection. In order to ensure the accuracy of the inspection results, it is necessary to use instrument testing. Instruments such as hardness testers, tensile machines and meters must be used for testing.
Conclusion
The quality inspection of forged parts is very complex. In order to ensure product quality, it is necessary to conduct strict quality inspection and management. This article has introduced the concepts and common inspection methods of forged parts, and hopes to provide some help for related quality inspection and management.
