Analysis of problems in aluminum alloy die casting process
Time:2022-09-15 14:03:11 Views:
Aluminum alloy dies casting is a casting method with high efficiency and efficiency. With the development of high technology applied to the actual production situation, die casting will achieve more rapid development.
Analysis of possible problems in the process of aluminum alloy die casting:
1, geometric defects: die casting shape. The deviation between size and technical requirements; Size out of tolerance, deflection, deformation, etc.
Surface defects: The appearance of pressed poems is poor, with patterns, flow marks, cold septum, spots, lack of flesh, burrs, shrink marks, strains, etc.
Internal defects: pores, shrinkage, porosity, cracks, inclusions, etc., internal organization and mechanical properties do not meet the requirements.
2. Influencing factors
(1) Die casting machine caused by: die casting machine performance,
Whether the energy provided can meet the required injection conditions: injection force, injection speed, and the clamping force are sufficient. Whether the selection and control of die casting process parameters are appropriate, including pressure, speed, time, punch stroke, etc.
(2) caused by die-casting mold
Mold design: mold structure, pouring system size, and position, ejector rod and layout, cooling system. Mold processing: mold surface roughness, machining accuracy, hardness. Mold use: temperature control, surface cleaning, maintenance.
(3) Die-casting design causes die-casting wall thickness, bending Angle, drawing inclination, hot pitch, deep concave position, etc.
(4) Die-casting operation causes alloy pouring temperature, melting temperature, inclined material spraying quantity, operation, production cycle, etc.
5) Alloy material is caused by raw material and return charge composition, cleanliness, ratio, melting process, etc. Any of the above factors are not correct and may lead to defects. It can be judged intuitively: the surface quality of the casting is analyzed by the naked eye for pattern, scratch, indentation, and deformation. Cold isolation, discoloration, spots, and so on can be visually seen, but also with the help of a magnifying glass magnification of more than 5 times for inspection.