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Frequently Asked Questions (FAQ)
How to prevent cracking of aluminum die casting die casting mold ?

Used die casting mold during production must, before adequate warm-up action on the specific operation as follows:
One should first ensure the casting mold to achieve a better degree of thermal equilibrium, thus enabling a more uniform aluminum die casting solidification, relative to the propagation of the pressure will be better!
2, followed by the mobility should remain valid in the casting process rely on good moldability to improve the quality of the surface of the aluminum die casting.
3, to minimize the adverse pre-production also need to cast an appropriate increase productivity.
4, finally, also need to pay attention to casting molds should minimize the heat generated alternating stress, improve casting mold life.

What is the role mold cooling system ?

Mold cooling water used in the right circumstances not only to extend the life of mold , but also improve production efficiency. In actual production , we often overlook its importance , the operator is also the easy way , then go to pick too much trouble , do not pick up the cooling water , and some companies even custom mold in order to save costs even when not cooled water , resulting in very serious consequences. The materials are generally dedicated mold tool steel produced through various processes , and even the best tool steel also have limits on the use of them , like on the temperature . Mold use state , if the mold temperature is too high, it is easy to get the mold core surface crack turtle appear early , some mold or die is not more than 2000 times Tortoise on a large area . Even in the production mold mold temperature is too high because of the mold core has changed color , measured even reached more than four hundred degrees, so the temperature of the re- release agent chilling encounter state is prone to crack turtle , products also easy to deformation, strain, mold and other sticky situations. Using a mold in the case of cooling water can greatly reduce the use of release agent , so that the operator does not take advantage of the mold release agent to lower the temperature of the . The advantage is that effectively extend tool life , saving die casting cycle, improve product quality, reduce strain and sticky sticky mold and aluminum happens, reduce the use of release agents . But also reduce the mold temperature overheat and cause ejector and core losses.

Die casting mold sticky, sticky material how to solve?

1 Check the mold temperature is normal, due to lower alloy pouring temperature and mold temperature;
2 Check the release agent ratio is abnormal, try to replace the mold release agents, commissioning spray position and spray volume;
3 die-casting mold surface is polished molds have been too nitride, carefully polished surface prevents destroyed nitride layer, further behind the formation of sticky situations;
4 Improved gating system design structure, to avoid continued erosion cavity wall alloy liquid or cores;
5 Modify the mold cooling system;
6 Adjust the die casting process parameters, due to lower injection speed, shorten the two-speed travel.
7 Try to wear on the moving mold several transverse grooves,0.2-0 .3 mm can be, die casting will show pulled very bright, will not be damaged. This can increase the number of movable mold clamping force side of the package, the casting mold to the move. Can solve the sticky mold in the production process too many times.

Aluminum die casting wall thickness problems ?

Aluminum die casting wall thickness have a great impact on their quality . Die surface of about 0.8 ~ 1.2 mm of the surface due to rapid cooling and fine grain , dense , because it is the presence of high strength die-casting . And if the thick-walled die casting, its walls central layer coarse grains , easy to produce shrinkage, shrinkage and other defects. Typically , the mechanical properties of die casting increases as the wall thickness decreases , but also increases the amount of material and the weight of the casting . Figure 3.1 for the casting wall thickness influence on the tensile strength . Figure 3.2 for the aluminum die casting wall thickness and tensile strength and weight relationships . Of course, the wall is too thin may occur due to cast , cold traps and other defects. Therefore, to ensure adequate strength casting conditions and stiffness in thin and uniform thickness is preferred. Generally , the wall thickness of not more than 4.5 mm, the same casting the largest and the smallest wall thickness ratio of not more than 3:1. Casting larger overall size , wall thickness should be as thick. The wall thickness is constant, the thickness of the area should also be subject to certain restrictions . Minimum wall thickness of casting with a suitable thickness shown in Table 3.11 .
To facilitate the flow of molten metal and die casting molding, die casting and die casting mold to avoid stress concentration and crack , die casting wall and wall connections usually recommend using domestic and international design standards of the fillet and corner reinforcing gradual transition connection.

How to identify good and bad release agent ?

1, see concentration. 

2, look at the water dilution rate.

 3, a good release agent container is not slick.

Better able to try, the actual effect is most convincing.

How are Die Castings Produced?


Die casting is a casting liquid forging methods, one on a dedicated machine to complete die forging process. The basic process is: first low-speed or high-speed liquid metal casting filling into the mold cavity, the mold cavity surface are active, which along with the cooling process of pressurized liquid metal forging, both to eliminate blank Shrinkage Song defects, but also to achieve the internal organization of rough forging state crushing grain. Rough mechanical properties has been significantly improved.



What are the classification casting mold ?

Depending on the type of die casting machine, die-casting mold structure is slightly different, the basic structure of each functional unit is basically the same, just with different forms of die casting machine, in the form of their gating system also slightly along there are different, then there are different according to the location of the whole vertical casting machine casting mold is mounted vertically, the other are horizontal installation, can be divided into the following forms.

1, hot chamber die casting machine die casting mold

2, vertical cold chamber die casting machine die casting mold

3, all vertical casting machine die casting mold

4, horizontal cold chamber die casting machine die casting mold

To prolapse die casting, often need to set multiple-surface disposal, these forms of die-casting mold often called secondary or several sub-type multi-plate casting mold.