In order to produce zinc alloy components of a high quality, it is essential to have precise control over the temperature of the die casting surface. This guide will walk you through controlling the temperature of the die casting mold as well as the filling time of the zinc alloy die casting process. Additionally, this guide will cover the topics of die casting filling time.
Controlling the Temperature of the Die Casting Mold While the Zinc Alloy Die Casting Process Is Being Carried Out Along with the Filling Time
1. The filling time, T, is equal to the q/v charging rate, Ag.
Where t is the filling time in seconds, q is the metal volume in cubic meters, V is the filling speed in meters per second, and ag is the cross-sectional area of the inner gate in square centimeters. Where t is the filling time in seconds, q is the metal volume in cubic meters, and V is the filling speed in meters per second.
When producing die castings, it is essential for the liquid metal to fill the mold cavity as quickly as is humanly possible. This ensures that the finished product has a crisp contour and a surface of the highest possible quality. The filling time for die casting mold workpieces ranges anywhere from 6 milliseconds to 40 milliseconds, depending on the properties of the workpiece. When it comes to mechanical workpieces or those that require electroplating, the filling time is less than 20 milliseconds, and the time it takes to paint a mechanical workpiece is less than 40 milliseconds. Both of these times are less than one second.
2. The amount of time over which the pressure is kept constant
After the metal liquid has finished filling the mold cavity, the injection cylinder needs to continue to function normally. This makes it so that the punch keeps applying pressure to the metal, which in turn makes it so that the liquid metal crystallizes under pressure. In addition, the volume reduction of the die casting that occurs during the solidification process needs to be continuously compensated for by the liquid. This is done so that the die casting retains its original shape. This will eventually lead to the production of a casting that has a dense structure as the end result. The solidification of a single strand takes longer than half a second, and the amount of time required to hold the casting is determined by the wall thickness of the casting in addition to the amount of time required for solidification at the inner gate. If there is a large number of voids and cavities found in the center of the nozzle material, this is an indication that the pressure maintaining time was insufficient and that the hammer return occurred too soon. If there is a large number of voids and cavities found in the center of the nozzle material, this is an indication that there was a large number of voidIf there are voids and cavities in the wall thickness of the casting or close to the inner gate, it is possible that the pressure holding pressure is not high enough. The surface of the pressed castings is frequently not appealing when the holding time is insufficient, and the machine process parameters need to be adjusted to compensate for this.
3. the maximum amount of time mold can be stored for
After the injection process has been completed, the molten metal that was contained within the cavity of the mold will start to solidify as the temperature drops. Only after the temperature of the casting has been lowered to a predetermined level and the casting has achieved a predetermined level of mechanical strength can the casting be removed. This is done to prevent the ejection from becoming misshapen or damaged. The mold retention time refers to the amount of time that passes after the pressure holding time has elapsed but before the mold is opened in order to eject the casting. This time elapses before the casting can be removed from the mold. If the ejection time is too short, the castings are susceptible to deformation, cracking, and blistering on the surface; if the mold retention time is too long, the mold holding force that is formed due to the solidification shrinkage force will increase, resulting in difficulties in core pulling and ejection, which can easily cause cracking of the castings; and if the ejection time is too short, the mold holding force that is formed due to the solidification shrinkage force will increase, resulting inThere is a wide range of possible times, from five to ten seconds, and it is determined by the size of the casting, the wall thickness, the shape, and the temperature of the mold. It is also possible to evaluate the degree to which the die-casting has been deformed in order to establish whether or not the recommended amount of mold retention time has been attained.
4. Mold temperature
When it comes to determining the overall quality of die castings, one of the most important factors to consider is the temperature of the mold itself. Throughout the duration of the process of die casting, the temperature of the mold will fluctuate.
Die temperature range of die casting mold:160 – 220 ℃
Electroplating castings can be done at temperatures ranging from 180 to 220 degrees Celsius.
When the temperature of the mold is too low, the process of filling the mold cavity with liquid metal results in the liquid metal beginning to solidify at an excessively early stage. Because of this, it is much simpler for imperfections like flow marks and surface return cold lines to manifest themselves in the final product. When the temperature of the mold is too high, it is easy for the mold to stick, and the surrounding workpieces will weld together with the mold. This is because the mold is at a higher temperature than they are. The casting will cool very slowly due to the high temperature of the mold, which will result in a grain that is very coarse. This makes it simple to generate shrinkage and porosity, both of which ultimately result in a decrease in the material's mechanical properties.
There is a one-to-one correspondence between the temperature of the mold and the spraying effect that the coating has.
The temperature of the mold has a direct influence on the casting cycle as well as the quantity of cooling water that is applied. The temperature balance of the die-casting mold can be controlled by the means of setting the cooling water circuit and adjusting the volume of cooling water. These are the two ways in which the temperature balance can be controlled.
During the process of production, it is essential to pay attention to maintaining a consistent die casting cycle in order to maintain the temperature of the China die casting mold and ensure that it does not fluctuate. In addition, it is critical to ensure that the temperature of the China die casting mold is not affected by external factors.
