Mold technology: die casting defects and the causes – die technology, die castin
Die casting production quality problems arise in regard to the characteristics of casting defects, causes casting defects and improvements.
Hardware Network HC Die-casting production quality problems encountered in many, many reasons also. Production quality problems must be generated to make the right judgments. Find out the real reason, to make appropriate practical and effective measures for improvement in order to constantly improve the quality of casting.
Die casting production quality problems, the deficiencies related to the characteristics, causes (including improvements) are described below.
One, due to cast Die-casting forming process, some parts of filling is incomplete, as less casting. When casting the part of less serious, as the shape of the casting does not meet the requirements of the drawings to look. Usually for less casting is not allowed to exist.
Caused due to cast the following reasons:
1) filled with bad conditions, due to irregular condensation cast metal parts
When the pressure is insufficient, inadequate, premature solidification of metal flow front, causing the corner, concave, thin (even thinner than the average thickness), cylindrical hole wall and other parts produced less cast.
Mold Temperature too low Alloy poured into the temperature is too low
Gate location within the well, forming a large flow resistance
2) gas barriers cast parts due to smooth, but irregular
Difficult to set up row overflow system parts, gas accumulation
Molten metal flows, severe turbulence, including volume of gas
3) Mold Cavity with residues Paint Improper dosage or spraying, resulting in partial coating deposition
Forming part of the mosaic cracks too large, or sliding with the gap is too large, fill when fleeing into metal, cast extrusion, the not entirely out of the show can be caught in the gap on the sheet. When the kind of sheet metal (sheet metal, its thickness shall be the size of gap) has more convex than the surrounding surface, mold it in the case of the height of the protrusion into the wall thickness suitable for the casting, so that castings produced in the area after penetration (on the wall for) the grooves. This penetration of the trench becomes less a special form of cast. This phenomenon owes much cast in the mosaic of deep cavity down.
Poured inadequate material (including material section is too thin I).
Vertical die-casting machines, Shot, the next Drift Down enough to open the nozzle orifice, causing a series of fill condition is bad.
II crack Casting the matrix is damaged or disconnected, the formation of slender gap, irregularity of the alignment, the trend under external force, such defects as cracks. In the die casting, the crack is not allowed to exist.
Cause of the crack are: 1. Castings structure and shape Thick and thin wall castings on the phase transition to avoid severe Office
Castings not turn corner Casting parts can be placed putting enough, resulting in uneven distribution putting
Casting design, ill-considered, the contraction of the stress and tears.
2. Die forming part of the surface quality is not good, solid installation unstable
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