Five Elements Of Aluminum Die Castings To Produce Stoma

Publish Time: 05/17 2021 Author: Site Editor Visit: 11044

Human Factors

Is the release agent sprayed too much? Because the release agent has a large amount of gas, when the amount is too large, it is not burned out before pouring, so that the volatile gas is wrapped on the surface of the casting. Therefore, under the same conditions, some workers will produce more pores during operation. Choose a release agent with a small amount of air, the dosage is thin and even, and the mold will be closed after burning.
The overflow channel and exhaust duct have not been cleaned frequently?
Is the mold opening too early? Is the mold preheated? Is the temperature of each part heated slowly and evenly? Make the surface temperature of the cavity and core be 150C ~ 200C
Are the products produced when the mold temperature is low at the beginning?
If there is no preheating device, is the aluminum alloy material used to push into the cavity to preheat or use other methods to heat it?
Have you taken clean aluminum liquid, and has the oxide layer been injected into the pressure chamber?
When pouring, whether the soup spoon is close to the injection port of the pressure chamber to avoid flying waves, oxidation, or being involved in air cooling, etc.
As soon as the molten metal is poured into the pressure chamber, does the injection begin? Has the temperature decreased?
For cooling and mold opening, do you choose the mold opening time according to different products?
Is there any reason to fear that the molten aluminum will fly out (flying water) and dare not use the normal die-casting pressure? Do not dare to try to increase the specific pressure appropriately.
Does the operator strictly abide by the die-casting process?
Is there any quantitative pouring? How to determine the pouring amount?

Factors of equipment, mould and tooling

The factors of equipment, mould and tooling mainly involve mould quality and equipment performance.

Is the die-casting mold design reasonable? Will it cause pores?

Reasons for die casting molds:

Whether the selection of the orifice position and the shape of the diversion are improper, causing the molten metal to enter the cavity and produce frontal impact and vortex. (Reduce injection speed to avoid vortex entrapment)
Is there any bad design of the sprue shape?
Is the speed of the inner gate too high, causing flow dissipation?
Is the exhaust not smooth?
Is the position of the mold cavity too deep?
Is the machining allowance too large? It penetrates the dense layer of the surface, exposing the subcutaneous pores? The machining allowance of die castings should be smaller, generally around 0.5mm, which can reduce the weight of the castings and reduce the amount of cutting processing. Reduce costs and avoid exposure of subcutaneous pores. The margin should not be greater than 0.5mm, so that the processed surface can hardly see pores, because it is protected by a hard layer.

2.2 Is the exhaust hole blocked and the air cannot be discharged?

2.3 Is there too much lubricant on the punch, or burned corners? This is also one of the sources of gas.

2.4 Does the gate position and diversion shape first seal the overflow system on the parting surface?

2.5 Is the position of the inner gate unreasonable? After passing through the inner gate, the metal immediately hits the shaped wall and generates eddy currents, and the gas is drawn into the metal flow?

2.6 The position of the exhaust duct is incorrect, causing poor exhaust conditions?

2.7 Is the area of the spillway large enough? Is it blocked and is it located at the last filling place? Is the mold venting part cleaned frequently? To avoid losing the venting effect due to clogging of the release agent

2.8 Is the mold temperature too low?

2.9 Is the runner turning round enough? Increase the inner gate appropriately?

2.10 Are there any vent plugs in the deep cavity, or use inlays to increase venting?

2.11 Is there any part that is difficult to exhaust due to unreasonable die-casting design?

2.12 Is the total cross-sectional area of the overflow less than 60% of the total cross-sectional area of the inner gate, and the slag removal effect is poor?

2.13 Is there a way to increase the thickness of the inner gate to reduce the filling speed under good molding conditions?

2.14 Is the gate speed too high, the flow dissipation is excessive, and the metal flow is seriously involved in gas?

2.15 Is the cross-sectional area of the inner gate too small and serious jetting?

2.16 Whether to fill in order to facilitate the discharge of cavity gas. Is there sufficient length for sprue and runner?

Three Material Factors

Have you done a good job in the composition control of the supplier's raw materials? What is the iron content? (required below 0.7)
Is the purity of aluminum guaranteed?
Is the secondary material (nozzle material) used too much and has not done a good job of removing slag?
Did not add too much waste slag bag in the aluminum liquid during the production process, and pour it together with the oxide scale during pouring?
Does the company control the proportion of secondary use of waste materials? How to implement it? Who checks it?
Is it possible to add waste to the aluminum liquid of important customers' products?
Try to change the ratio of new material to recycled material?
Is the charge clean?

Four Die-Casting Parameters, Operating Process Factors

Is there any choice of process parameters according to different products? (Die-casting aluminum liquid temperature 630-670*C) Each machine selects the die-casting process parameters, especially the injection speed, and adjusts the high-speed switching starting point.
Is there a way to reduce the water content of the release agent? Is there a release agent with a small amount of air?
Is the aluminum alloy cultivation temperature too high?
How to measure the temperature of molten aluminum? Is the thermometer accurate?
Is there a timely adjustment of the injection speed and the conversion point of the injection speed according to the product?
Whether there are big machines for die-casting small parts. Is the pressure chamber too small?

Five Environmental Factors

Is the air humidity in the die-casting environment high?

Under normal circumstances, the hydrogen content in the surrounding air is not much. But if the relative humidity in the air is high, it will increase the solubility of the gas in the molten aluminum and form seasonal pores. For example, in the rainy season, due to the high humidity of the air, the phenomenon of pinholes during aluminum alloy melting is more serious. Of course, the air humidity is high. At this time, aluminum alloy ingots, smelting equipment, tools, etc. will also increase the amount of surface moisture adsorption due to humid air, so more attention should be paid to adopting strong preheating and drying protective measures to reduce the generation of pores.

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