Like ordinary die forging, aluminum alloy precision forgings are also made according to product parts drawings. It is the main basis for formulating precision forging technology, planning precision forging die, manufacturing and inspecting forgings.

1. Confirm the shape, size, position and various skill requirements of precision forgings;

2. Selection of parting surface: generally, it is not allowed to select the precision forging part. For example, the parting surface of straight bevel gear is generally selected on the large diameter and rear cone surface, and the parting surface of spur gear is selected on the large end surface;

3. machining allowance and public service: after the fine casting part is cast, no machining will be carried out, so machining allowance is not set, which is exactly the same as the size of the part drawing. The allowance and public service of other machined surfaces can be confirmed according to the standard GB12362-90 fine level;

4. Die inclination and fillet radius: During fine die forging, there are generally ejection devices on the die, so the die inclination is very small. The radius of fillet depends on the part drawing.

What are the advantages of high-speed cutting for aluminum alloy precision forgings?

First, the machining efficiency is high, which greatly improves the fast idle stroke speed of the machine tool, reduces the non-cutting idle stroke time and greatly improves the productivity of the machine tool;

Second, the cutting force is reduced, and the radial cutting force can be greatly reduced, which is especially beneficial to the precision machining of parts with poor rigidity such as thin-walled ribs;

Thirdly, the machining cost is greatly reduced, and the grinding and finishing processes are reduced;

Fourth, the machined surface has good quality, stable operation and small vibration;

Fifth, it is beneficial to ensure the size and position accuracy of parts;

6. Ensure that the cutter and workpiece are kept at low temperature and prolong the service life of the cutter;

Seven, the thermal deformation of the workpiece is reduced, and the high-speed cutting tool has good thermal hardness, which reduces environmental pollution and realizes green processing.

Detection of internal defects in aluminum alloy die forging

Different processes will produce different forms of defects, but the same form of defects may also come from different processes. The causes of defects in aluminum alloy die forging are related to many factors, such as raw material production process, post-forging heat treatment process and so on. Different inspection methods are also needed for the quality inspection of aluminum alloy die forging.

Classification of aluminum alloy die forging defects according to their forms can be divided into three types: external defects, internal defects and performance defects. External defects such as geometric size and shape do not meet the requirements; Surface cracks, wrinkles, lack of meat, errors; Insufficient die forging, surface pockmarks, surface bubbles and orange peel. This kind of defect appears on the outer surface of aluminum alloy die forging, which is easy to find or observe. Performance defects, such as unqualified room temperature strength, plasticity, toughness or fatigue performance; Or the instantaneous strength, durable strength, durable plasticity and creep strength at high temperature do not meet the requirements. Performance defects can only be determined after performance tests are performed.

Internal defects can be divided into macro defects and micro defects. The former includes internal cracks, shrinkage cavities, pores, white spots, disordered forging flow patterns, segregation, coarse grains, stony fractures, heterogeneous metal inclusions, etc. The latter includes decarburization, carburization, banded structure, casting structure residue, and the degree of segregation of carbonized materials does not meet the requirements. There are internal defects in aluminum alloy die forging, the reasons are complicated, and it is difficult to find out, which often causes great difficulties in production. Therefore, it is necessary to use a professional testing tool-X-ray nondestructive testing.

X-ray can penetrate aluminum alloy die forging, and the internal situation can be transformed into images by X-ray detection equipment, which can be presented intuitively. Really achieve the effect of "perspective". The self-developed X-ray industrial inspection equipment has high imaging resolution and automatic inspection level, which has well solved the problem of internal defects detection in aluminum alloy die forging. Due to the different forging dimensions of industrial aluminum alloy dies, special equipment can be customized according to customers' requirements to meet customers' diversified testing needs.

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