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Die-Cast Zinc Alloy Common Problems

2017-12-25 14:48

Zinc alloys are widely used in traditional products such as mechanical parts, hardware, locks, toys and other industries.It has excellent casting properties, mechanical properties and toughness. The z

Zinc alloys are widely used in traditional products such as mechanical parts, hardware, locks, toys and other industries.It has excellent casting properties, mechanical properties and toughness. The zinc alloy also has excellent thermal conductivity, good vibration damping characteristics and good electromagnetic shielding performance.Therefore, the application of the electronic, telecommunication and household appliances is increasing, especially the electronic products which need to solve the electromagnetic shielding problem.
One, are you using a "good zinc alloy"?
A good zinc alloy must have the following 3 features:
1. high purity, low content of impurities in high purity zinc: zinc based raw materials, such as the quality of 0# ingot.
2. low melting point: the good melting point of zinc alloy is controlled at 380-390. The temperature of the crucible can be controlled below 420 degrees C.
3. less slag melt, less slag produced.
Two, How to identify a good zinc alloy?
If the cross section is fine, it is generally better.nuowei
Three, Is the "cheap" zinc alloy really "cheap"?
1. The high melting point of the alloy will destroy the composition of the zinc alloy.
When the temperature of the crucible exceeds 420 degrees C, it will cause loss of magnesium and aluminum in the alloy, change the composition of the alloy, influence the quality of the product, and increase the waste rate.
2. High melting point of alloy and cost of energy consumption
Generally, the setting temperature of the alloy in the process of production is 410 degrees C, and the poor zinc alloy may need to be set to more than 430 degrees C.
3. high melting point alloy, reduce heat component life
Crucible temperature should be normal about 410 degrees C. If the temperature is too high, it will speed up the hammer head, hammer handle, Steel MTX, gooseneck, crucible wear and corrosion, serious will be stuck dead hammer.To gooseneck as an example: the normal gooseneck life of more than 1.5 million die, the liquid corrosion of gooseneck alloy serious, then the production of 1 million mold may make its production problems, serious may be directly scrapped, the cost increased significantly .
4. high melting point, reduce die life
Zinc alloy material melting point increases, the damage to the mold is great, will reduce the service life of the mold, and will make the mold corrosion, mold life shortened, the cost per model product increased.
Four, how to properly store zinc alloy?
Zinc alloy ingots deposited in the wet and dirty environment, will make the slag increase, effectively reduce the amount of alloy, The quality of the die casting products will also be reduced, so the environment for the storage of zinc alloy ingot should be managed.
1. to ensure the cleanliness and drying of the stacking area
2. Sampling inspection (or regular test) of zinc alloy before use
Five, how to reduce the zinc slag?(shown in the following Three aspects)
1, as far as possible, avoid the stirring of the alloy fluid in the zinc pot. Any way of stirring will lead to more contact between the alloy liquid and the oxygen atoms in the air, resulting in the formation of more scum.
2, heating should be uniform, to prevent explosion and local overheating, strict control of the melting temperature, the higher the temperature, the more dross.
3, do not be too frequent dig up slag.When the molten alloy is exposed to the air, oxidation will occur, and the slag is formed. The retention of a thin layer of scum on the surface of the furnace is beneficial to the non oxidation of the liquid in the pot.
Performance and other properties of die-casting zinc alloy die-casting

performance

Alloy grade

 

2#

3#

5#

7#

ZA8

ZA12

ZA27

Thermal cracking resistance

1

1

2

1

2

3

4

Airtightness

3

1

2

1

3

3

4

Die casting performance

1

1

1

1

2

3

3

The complexity of the parts

1

1

1

1

2

3

3

Dimensional accuracy

1

1

1

1

2

2

3

Dimensional stability

4

2

2

1

2

3

4

Corrosion resistance

2

3

3

2

2

2

1

Processing performance and quality

1

1

1

1

2

3

4

Polished and quality

2

1

1

1

2

3

4

Plating performance and quality

1

1

1

1

1

2

3

Anodized

1

1

1

1

1

2

2

Chemical coating

1

1

1

1

2

3

3

Note: 1 means the best, 5 means the worst.

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