In Precision Shaft Die Casting Processing, pores and shrinkage defects are common quality problems, which will seriously affect the performance and service life of the product. In order to effectively reduce these defects, the following measures can be taken:
1. Optimize alloy composition and smelting process
Selection of alloy composition: Select alloy materials with low gas content and high purity to avoid excessive impurities in the alloy causing gas generation. For example, materials with high hydrogen content should be avoided in aluminum alloys to reduce the formation of hydrogen pores.
Control of smelting process: During the smelting process, the smelting temperature and time should be strictly controlled to avoid overheating and large-scale gas generation. At the same time, appropriate refining agents and degassing processes, such as inert gas (nitrogen, argon) degassing method, are used to effectively remove gas and inclusions in the melt.
2. Improvement of die casting process
Optimization of die casting parameters: Reasonably set the parameters such as pressure, speed and temperature of the die casting machine to ensure that the molten metal can flow smoothly when filling the cavity, reduce eddy currents and turbulence, and thus reduce the risk of air entrainment. In addition, appropriately extending the holding time can help to compensate for shrinkage cavities generated during the solidification process.
Improvement of mold design: Optimize the pouring system and exhaust system of the mold. The design of the pouring system should ensure that the molten metal can fill the cavity evenly and smoothly to avoid pores and shrinkage cavities caused by local overheating or uneven cooling. At the same time, sufficient exhaust grooves and overflow grooves are set in the mold to discharge the gas and excess molten metal in the cavity in time.
3. Strengthen post-processing and testing
Improvement of post-processing technology: Through heat treatment, vibration aging and other methods, the residual stress and microcracks inside the casting can be eliminated, which helps to reduce the formation of pores and shrinkage cavities. In addition, surface treatments such as sandblasting and grinding of castings can also improve the surface quality of castings.
Strengthening of detection means: Use advanced detection equipment and technologies, such as X-ray flaw detection and ultrasonic detection, to conduct comprehensive and detailed inspections of castings. These detection methods can accurately detect defects such as pores and shrinkage cavities inside castings, providing strong support for subsequent improvement measures.
In summary, reducing the defects of pores and shrinkage in Precision Shaft Die Casting Processing requires starting from multiple aspects such as alloy composition, smelting process, die casting process, post-processing and testing. By continuously optimizing and improving these links, the quality and performance of castings can be significantly improved.
