ADC-12 (equivalent to ZL104 in China) is a die-cast aluminum alloy grade, which is a brittle material and is prone to chipping. It is similar 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 gimbals, engine housings, etc. The specific performance indicators can be provided by the aluminum alloy die-casting factory, or I will be informed after checking the information. There are a large number of manufacturers in Nanhai City, Guangdong Province.
How much is the wall thickness of the aluminum alloy housing of a digital camera? How is the surface treated? Are there any manufacturers that process these products? Wall thickness: 1.2~1.5mm, surface: chromic acid film after spraying;
How to detect the internal cracks of aluminum alloy die castings?
Products are inspected by non-destructive testing
1. Ultrasonic flaw detection
Ultrasonic testing and ultrasonic thickness measurement of all kinds of metal pipes, plates, castings, forgings and welds.
When ultrasonic waves encounter cracks, voids, segregation and other defects in propagation, the acoustic parameters such as sound velocity, amplitude, and frequency of ultrasonic waves will change. By measuring these changes according to the instrument, the presence of defects can be judged and their specific location can be determined.
If there is a defect inside the probe and there is an interface between the defect and the material, then a part of the ultrasonic wave emitted by the person is reflected or refracted at the defect, and part of the ultrasonic energy propagating in one direction is reflected, and the energy through this interface is reduced accordingly. At this time, the reflected wave at this defect can be received in the direction of reflection; The ultrasonic energy received in the propagation direction will be less than normal, and the presence of both cases proves the existence of the defect. In flaw detection, the location and size of defects can also be detected by using the probe's ability to receive pulsed signals. The former is called the reflection method and the latter is called the penetration method.
2. Magnetic particle flaw detection
It is suitable for non-destructive testing of ferromagnetic materials such as casting, forging and other machined components.
3. Ultraviolet lamp
Low price, high reliability and simple operation, leakage detection of various pipelines, inspection of uniform coating, detection of impurities or stains, semiconductor and biological fields, medical treatment, stage special removal of artistic effects
4. Radiographic 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 substances and the actinization and fluorescence of certain substances. From the perspective of ray intensity, when the ray intensity is J0 on the workpiece, the ray passing through the workpiece is weakened to Jc due to the attenuation of the ray by the workpiece material. If there is a defect in the workpiece, the actual thickness of the workpiece transmitted by the ray at that point decreases, and the ray intensity Ja and Jb passing through is greater than that of the point without the defect. From the perspective of the actinic effect of the ray on the negative, the strong part of the ray has a strong actinic effect on the negative, that is, the light sensitivity is large. Negatives with a high amount of light sensitivity are darkened after darkroom treatment. Therefore, the defects in the workpiece produce a black shadow on the negative film by rays, which is the flaw detection principle of radiographic photography.