ADC-12 (equivalent to domestic ZL104) is a die-cast aluminum composite number, which is a brittle material and is easy to crack. It is similar in nature to cast iron, but has the advantages of light weight and good thermal conductivity. It is mainly used to make high-end telescope housings, camera tripod heads, engine housings, etc. The specific performance indicators can be provided by the aluminum alloy die-casting factory, or wait for me to check the information before informing. There are a large number of manufacturers in Nanhai City, Guangdong Province.
What is the reasonable wall thickness of the aluminum alloy shell of a digital camera? How is the surface treated? Are there any manufacturers that process such products? Wall thickness: 1.2~1.5mm, surface: chromate coating after spraying;
How to detect internal cracks in aluminum alloy die castings?
Detect products
through non-destructive testing 1. Ultrasonic testing
of various types of metal pipes, plates, castings, forgings and welds ultrasonic testing and ultrasonic thickness measurement
When ultrasonic waves encounter defects such as cracks, cavities, and segregation during propagation, the acoustic parameters such as sound speed, amplitude, and frequency of ultrasonic waves will change. Measuring these changes according to the instrument can determine the presence of defects and determine their specific location
If there is an internal defect and there is an interface between the defect and the material, then part of the ultrasonic wave emitted by the person is reflected or refracted at the defect, and part of the ultrasonic energy originally propagated in one direction is reflected, and the energy through this interface is reduced accordingly. At this time, the reflected wave can be received at the defect in the reflection direction; The ultrasonic energy received in the propagation direction will be less than normal, both of which can prove the existence of defects. In flaw detection, the position and size of defects can also be checked by using the performance of the probe to receive pulse signals. The former is called the reflection method, and the latter is called the penetration method.
2. Magnetic particle testing
is suitable for non-destructive testing of ferromagnetic materials such as casting, forging and other machined parts.
3. Ultraviolet lamp
is cheap, reliable and simple to operate, leakage detection of various pipelines, inspection of uniform coating layer, detection of impurities or stains, semiconductor and biological field, medical, stage special removal of artistic effects
4. Ray flaw detection
Radiographic flaw detection can be divided into three types: X-ray, γ-ray and high-energy ray flaw
detection X-ray flaw detection is based on the attenuation law of rays in materials and the actinic and fluorescence effects of certain substances. From the perspective of ray intensity, when the ray intensity is J0 when irradiated on the workpiece, the rays passing through the workpiece are attenuated to Jc due to the attenuation of the rays by the workpiece material. If the workpiece has defects, the actual thickness of the workpiece transmitted by the rays at that point is reduced, and the ray intensity Ja and Jb passing through it are greater than that of the point without defects. From the perspective of the actinic effect of rays on the film, the part with strong rays has a strong actinic effect on the film, that is, the photosensitivity is large. Films with higher light sensitivity become darker after darkroom treatment. Therefore, the defects in the workpiece produce black traces on the film through rays, which is the flaw detection principle of radiographic flaw detection photography.