Die Casting Parts Have Clear Rules
Production practice shows that improving the quality of aluminum alloy melt is to improve the quality of die casting a key factor in the aluminum alloy 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 need for refining agent, Die Casting Parts 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 molten metal to the appropriate time to slag, degassing work, in the process of concentration of molten metal per pot should be the chemical composition of the test to ensure that the product in the melting process of various chemical composition qualified. Die Casting Parts But also to avoid long smelting, it will make the alloy liquid hydrogen content increases, will affect the strength of the die-casting products, air tightness and other properties.
For the production of those with airtight requirements of the castings, Die Casting Parts but also need to monitor the gas removal effect to ensure that the gas content 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.
Generally, a simple method can be used to confirm the slow injection process parameters. Die Casting Parts 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, Die Casting Parts turning observation to judge.
At the correct slow injection speed, when the molten metal reaches the inner gate, the molten metal in the press chamber has completely become a complete cylinder.Die Casting Parts When it is found that the internal structure is relatively dense and there is no visible pores, Slow injection speed is generally appropriate. Inappropriate slow injection speed, will produce serious gas. As can be seen from Figure 2, slow injection speed of 0.17m / s, the handle inside the existence of serious holes. At this time will have a negative impact on the quality of castings.
As the degree of automation of die-casting production is generally low, basically also in a semi-manual operation of the state, the quality of die casting and operating skills, working environment, mental state has a great relationship; in order to make these factors as possible Stability, Die Casting Parts my company in this regard to take the main measures are: fixed, fixed machine, set the product of the "three principles", that is, the specific people in a particular device to produce specific products; once any of the three Factors have changed, must be confirmed and monitored,
Under normal circumstances, the production of each product are carried out in batches, each time to re-replace the mold after the consistency of the process must be clearly confirmed; the current die-casting equipment on the more common speed adjustment method is relatively simple, Die Casting Parts slow Injection speed is basically no detection and control, fast injection speed is often used as shown in Figure 3 to adjust the hand wheel, according to the manufacturers to provide hand wheel scale and two fast table to check the current process parameters;
The internal quality of die-casting is the most convenient and quick way to detect, Die Casting Parts 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 the enterprises that simultaneously produce rough and follow-up machining. However, for those factories that only produce rough , The test of the product test method, Die Casting Parts although the inspection of the quality of the blank pieces of the product, Die Casting Parts but the test pieces of products will be directly discarded, the product pieces of the trial process if you can not get a good control, it will be a not Small loss; test processing is mainly for the internal quality requirements are higher, there are those who require air tightness.