Die Casting Parts Requirements
Production practice shows that improving the quality of aluminum alloy melt is the key factor to improve the quality of die casting, aluminum melting process to the melting temperature, Die Casting Parts melting time, back to the charge of the ratio should be clearly defined in the aluminum alloy smelting process, Where the use of back to the charge of aluminum liquid, the required refining agent, the proportion of slag removal agent than the use of aluminum alloy ingot melting, the increase in proportion and the proportion of back to the charge to have a corresponding relationship. After the smelting of the metal liquid to timely de-slag, degassing work, Die Casting Parts in the process of concentration of molten metal per pot should be the chemical composition of the detection, to ensure that the product in the melting process of various chemical composition qualified. But also to avoid long smelting, it will make the alloy liquid hydrogen content increases, will affect the strength of the die-casting products, Die Casting Parts air tightness and other properties.
For the production of those who have the requirements of the airtight casting, but also the need to monitor the gas removal effect to ensure that the gas in the alloy liquid to meet the requirements, if necessary, the use of hydrogen car on the aluminum liquid gas content of the qualitative measurement and the use of density Measurement method to monitor the quality of aluminum liquid.
Slow injection is the role of the slow movement of the punch, Die Casting Parts the metal melt accumulation in the punch front without jump wave, with the punch forward, the melt level gradually increased to reach the top of the pressure chamber, the pressure chamber The gas is removed from the mold exhaust. To this end, in the slow injection preheating mold stage, it is necessary to set the process of slow injection speed to verify.
It is generally possible to use a simple method to confirm the slow injection process parameters. When the plunger starts to reach the quick start position, the plunger stops automatically (the function can be customized on some die presses). To be alloying liquid after cooling out, cutting, turning observation to judge.
At the correct slow injection speed, when the molten metal reaches the inner gate, Die Casting Parts the molten metal in the press chamber has completely become a complete cylinder. When it is found that the internal tissue is relatively dense and there is no visible pores, Slow injection speed is generally appropriate. Inappropriate slow injection speed, will produce a serious volume of gas. As can be seen from Figure 2, slow injection speed of 0.17m / s, the handle inside the existence of serious holes. This will have a negative impact on the quality of castings.
The internal quality of the die-casting is the most convenient and quick way to detect, but there is a large investment, the result is not intuitive and other factors, Die Casting Parts commonly used, the most direct test method is to try processing; test we can be more intuitive To observe the quality of the machine plus the surface, the product quality to make a reasonable judgment.
It is practicable to plan the processing of the blanks directly to the production line to determine the internal quality of the blanks for those enterprises that simultaneously produce rough and follow-up machining. However, for those factories that only produce rough , The test of the product test the way, Die Casting Parts although the inspection of the quality of the blank pieces of the product, but the product will be processed directly discarded, the product of the test process if you can not get a good control, it will be a not Small losses; Die Casting Parts trial processing is mainly for the internal quality requirements are higher, there are those who require air tightness.