The parameters of zinc alloy die-casting focus on specific pressure and filling speed, both of which are important process parameters in the die-casting process. Other process parameters include filling time and mold temperature.
die casting (English: die cast) is a metal casting process characterized by the use of a cavity to apply high pressure to molten metal. Molds are usually made of higher-strength alloys, and the process is somewhat similar to injection molding.
Most die castings do not contain iron, such as zinc, copper, aluminum, magnesium, lead, tin and lead-tin alloys and their alloys. Depending on the type of die casting, a cold chamber die casting machine or a hot chamber die casting machine is required.
Zinc alloy is an alloy based on zinc combined with other elements. Commonly added alloying elements are low-temperature zinc alloys, such as aluminum, copper, magnesium, cadmium, lead, and titanium.https://sandcasting.top
Zinc alloy has a low melting point, good fluidity, easy to weld, braze and plastic processing, corrosion resistance in the atmosphere, and easy recovery and remelting of residual materials; but low creep strength, easy to naturally age and cause dimensional changes.
Preparation of materials made by melting method, die casting or pressure processing. According to the manufacturing process, it can be divided into cast zinc alloy and wrought zinc alloy.
Because zinc alloy die-casting has good die-casting and mechanical functions, it always maintains an important position in hot-chamber die-casting.https://sheetmetal.top/
The advantages of zinc alloy are low melting point, slow melting and heat preservation, and less heat in the pressure chamber and die casting mold wall. How to reduce the shortcomings and manufacture zinc alloy die castings that meet the requirements mainly includes the following aspects:
First, choose the right die casting machine
Die casting machine is the key equipment for die casting. The quality of its functions objectively determines the quality of die castings. The correct choice of die-casting machine is essential to ensure product quality, improve production efficiency and reduce production costs. The function of the die casting machine depends on two aspects.
Satisfactory clamping force: Prevents the flow pressure of the molten metal from reaching peaks, showing flash and flying materials.https://www.cncmachiningptj.com
Satisfactory injection ability: to ensure that the mold will not overheat or overflow during the die-casting process, and to ensure that the machine has enough molten metal to transport and fill the cavity at the required speed in a short time.
Second, die-casting mold runner plan
Since the zinc alloy must fill the cavity in a short time, the planning and manufacturing of the die-casting mold and its runner system are much higher than that of the plastic mold. The runner system uses a certain method to guide the metal solution to fill the cavity. It plays an important role in the flow direction of the metal liquid, pressure transmission, filling time, exhaust conditions and mold temperature distribution.https://cnctraining.cn/
It is also an important factor that determines the quality of die castings. The principle of the die-casting mold channel system planning should be summarized from the gooseneck to the gate to prevent sharp corners, and the runner surface should be lubricated to reduce resistance and maintain the flow rate of the liquid zinc alloy.