Quality Inspection of Die Forgings

Quality inspection of die forgings
 Select the die forging process to obtain die forgings with qualified dimensions, internal structure and performance. Therefore, the corresponding quality inspection must be carried out according to the requirements of the technical conditions of die forgings. In fact, the quality inspection of die forging products is not only to point out the final inspection in front of the factory, but also to further scientifically manage and use all the quality inspection data to continuously improve the production process and improve the production level of the enterprise.
The quality inspection of die forgings is divided into two parts: appearance quality inspection and internal quality inspection. Each part includes many inspection items. The first is chemical composition inspection, which is usually sampled before the furnace during the smelting process. Especially for important or suspicious die forgings, some fragments can be cut from the forging and chemical analysis or spectroscopic methods can be used to check the chemical composition.
Dimension and shape inspection of die forgings. Visual inspection of appearance is a widely used method. Whether there are wrinkles, cracks, extrusions, scars, surface burns and other defects on the forging surface can be observed with the naked eye. However, there are hidden deep defects on the surface of die forgings, which are usually observed after heat treatment and cleaning. However, its dimensional measurements include length, width and height. The parallelism and perpendicularity of the plane; the bending degree of the axis; the ovality of the inner and outer circles; the radius of the fillet; the concentricity; the angle and displacement, etc.
When accurate dimensional inspection of die forgings is required, in addition to marking inspections and special samples, computer-controlled and analyzed inspection instruments, or optical comparators and optical projectors can be used for related dimensional inspections to ensure the accuracy of inspection results. sex.
At the same time, the mechanical properties of die forgings were also tested. Relevant samples must be cut from forgings taken from the same heat treatment furnace. The cutting of the sample, the shape, size and inspection method of the sample shall be carried out in accordance with the national standards. Test items include hardness test, extension test, impact test and other tests.
Surface flaw detection is also part of the quality inspection of die forgings. Through magnetic particle detection and fluorescence detection, the acid-base surface quality of the film is judged. In addition, there are ultrasonic inspections, macroscopic structural inspections, microscopic inspections, residual stress inspections, etc., and each link cannot be ignored.