advantage

1 The melting cost is only 2/3 of aluminum

2 Die casting production efficiency is 25% higher than aluminum, metal mold casting is 300-500K higher than aluminum, and lost mold casting is 200% higher than aluminum

3 The surface quality and appearance of magnesium castings are significantly better than that of aluminum (because the thermal load of the mold is reduced, the inspection frequency can be reduced)

4 Die life twice as long as aluminum (or more, depending on cavity shape)

5 Magnesium removal Angle can be small (can cancel subsequent machining), and the surface shape is good (because of the low viscosity of magnesium)

shortcoming

1 Compared to aluminum die casting, magnesium die casting production has a higher residual waste rate (compared to aluminum die casting waste production rate).

2 Magnesium die casting production equipment investment is high. Compared with processes such as aluminum gravity/low pressure/nitrate mold, magnesium die casting machines are very expensive (because of the high clamping force and filling injection speed), and of course their productivity is 4 times that of the former.

3 Magnesium die casting requires a higher mold cost and a longer trial time, while steel parts (manufactured using simple welding techniques and machined to the drawing) or plastic parts (low-cost prototype tooling can be used) are much simpler.

4 Compared with aluminum low pressure or metal mold casting, magnesium die casting requires a higher mold cost. Because the die casting mold is large and complex, it also has to withstand high clamping force (of course, high productivity can also reduce the cost of a single product).

5 Magnesium die casting and aluminum die casting, the burn rate is 50K higher, that is, 4% than 2% (because of the higher surface activity of magnesium).

6 Recovery cost of magnesium die casting chips. Higher than aluminum, dry magnesium chips are not easy to recycle, and wet ones even less so, and great care must be taken to prevent fire.

Causes and solutions of surface damage of aluminum profiles

Main causes of surface damage of aluminum profiles

① The ingot surface is attached to debris or ingot composition segregation. When there are a large number of segregation surfaces on the ingot surface and the ingot is not homogenized or the homogenization effect is not good, there are a certain number of hard metal particles in the ingot. When the metal flows through the work belt during the extrusion process, these segregation surfaces or hard metal particles attach to the surface of the work belt or cause damage to the work belt, and finally cause scratches to the surface of the profiles.

(2) There are debris in the mold cavity or work belt, and the hardness of the mold work belt is low, so that the surface of the work belt is injured and scratched during extrusion;

③ There are hard inclusions in the bare metal or graphite strip on the discharge track or swing bed, which cause scratches on the surface of the profile when it is in contact with the profile;

④ When the fork rod sends the profile from the discharge track to the swing bed, the profile is hurt due to the high speed;

⑤ Scratches caused by artificially dragging profiles on the swing bed;

⑥ Damage caused by friction or extrusion between profiles during transportation.

solution

① Strengthen the control of ingot quality;

② Improve the quality of mold repair, mold nitriding regularly and strictly implement the nitriding process;

(3) Use soft felt to isolate the profile from the auxiliary tools to minimize the contact damage between the profile and the auxiliary tools;

④ In the production should be handled lightly, try to avoid dragging or turning the profile at will;

⑤ Place the profiles reasonably in the material frame to avoid mutual friction as far as possible.

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