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Owner, MOULDAST(Shanghai) Precision Machinery Co.,Ltd
The phenomenon of sticking mold in aluminum die casting has always been a difficulty to die casting practitioners. This article shows five ways in which casting practiotioners improve the sticky mold of castings.
Due to the sticky mold, many casting defects will be directly extended, such as cold shut, lack of material, internal porosity and leakage caused by the failure of surface dense layer and more. Therefore, amongst others, die casting practitioners need to take full precautions from the stage of die casting process design, die surface treatment production and maintenance, die casting production process control in order to minimize and control the incidence of sticky die. Here are are five ways to improve the sticky mold of die castings.
This is how surface sticking defects look like. (Source: MOULDAST(Shanghai) Precision Machinery Co., Ltd)
The setting of process parameters has a great influence on the sticky mold, such as the size of pressure and speed, the pouring temperature of the alloy, the temperature of the mold, etc., so the reasonable process parameters should be calculated according to the structure and use requirements of the casting.
The design structure of the improved gating system is to prevent the alloy liquid from continuously washing the cavity wall or core, and to appropriately increase the cross-sectional area of the inner gate. Change the position of the gate and the direction of introduction, so that the introduction is in a wide and thick position, and try to adopt the open pouring system of the bottom injection method. Sticking at the intersection: Start to improve the mold runner. The high gate speed makes the temperature of the local mold of the metal impact wall rise, and the formation of the sticky mold is faster, so you need to consider reducing the gate speed.
The higher the mold temperature, the easier it is to produce sticky molds. In the actual production process, we can use infrared thermometers to detect the mold sticking parts, control the mold temperature between 150 ℃ ~ 220 ℃, so that the mold reaches thermal equilibrium. The casting temperature of aluminum alloy is set to the minimum according to the requirements of castings, between 610 ℃ ~ 680 ℃, to reduce the formation of sticky mold.
Some surface treatment methods can prevent the occurrence of sticky molds. Special materials with higher melting points should be used to treat the surface of the mold. Various materials to prevent the occurrence of sticky molds can also be used to treat the surface of the mold to improve the surface of the mold. The hardness of the material at high temperature, the method of reducing the activity of the mold surface to avoid sticking the mold and other ways.
Adjust the spraying position and spraying amount; check the hardness value of the mold, adopt heat treatment and nitridation or replace the mold material; reduce the injection speed appropriately; increase the mold cooling, increase the spraying on the overheated position, and apply the Install a cooling system, etc.
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