Four requirements of die casting for die runner
Release time:2023-10-31
Four requirements of die casting for die runner
We must first understand clearly before we can make a good mold. The die casting factory uses advanced technology and new tools to provide high-quality die casting products to various channels. Let's take a look at the structure of the die casting mold.
① The entrance of the cross runner of the cold horizontal mold should generally be located at more than 2/3 of the inner diameter of the upper chamber, so as to avoid the metal liquid in the pressure chamber entering the cross runner prematurely under the action of gravity and beginning to solidified in advance.
② The cross-sectional area of the cross runner should be gradually reduced from the inner gate of the straight runner. For the expansion of the cross section, there will be negative pressure when the metal liquid flows through, which is easy to inhale the gas on the parting surface and increase the vortex gas in the metal liquid flow. Generally, the exit section is 10-30% smaller than the entrance section.
③ The runner should have a certain length and depth. The purpose of maintaining a certain length is to stabilize the flow and guide the role. If the depth is not enough, the liquid metal cools fast, the depth is too deep, and the condensation is too slow, which both affects the productivity and increases the amount of return charge.
④ The cross-sectional area of the cross runner should be greater than the cross-sectional area of the inner gate to ensure the speed of the metal liquid into the type. The cross-sectional area of the main runner should be greater than the cross-sectional area of each branch runner.
⑤ The bottom sides of the runner should be made of rounded corners to avoid early cracks, and the slope of about 5° can be made on the two sides. The surface roughness of the cross runner is less than Ra0.4μm.
