The method to solve the vortex hole:
Change the direction or position of the alloy liquid injected into the cavity, so that the alloy liquid first enters the deep part of the cavity or the wide part of the bottom layer, and press the cavity air in the part into the exhaust groove. Before the alloy liquid fills the cavity, the exhaust groove cannot be blocked;
Adjust the injection speed and fast pressure position, and shorten the second speed distance as much as possible under the premise of sufficient;
The aluminum alloy die-casting plant should ensure that there is no splash 、In the case of spraying and filling the cavity, increase the thickness of the inlet of the inner gate;
Strengthen the venting capacity of the cavity: (1) The position of the vent groove should be considered not to be affected by the alloy liquid that enters first. Blocking; (2) Add an overflow groove, pay attention that the joint between the overflow groove and the workpiece should not be too thick, otherwise it will be blocked prematurely and there will be pores around; (3) The structure of inlaid blocks is adopted, and the parting surface is designed to be zigzag Parting surface to solve the problem of difficult exhaust; (4) Increase the cross-sectional area of the rear end of the exhaust groove, generally the front end is 0.05-0.2mm thick, and the rear end can be thickened to 0.4mm.
According to the heat and exhaust of each part of the casting If the air condition, spray the paint properly, dry the water after spraying, avoid the water before the mold is closed;
Expand the gap between the punch and the pressure chamber to about 0.1mm, and appropriately extend the pressure holding time;
Adjust the height The position of the lower punch of the vertical die-casting machine, or increase the amount of alloy liquid injected into the chamber.
What is a vortex hole: The small holes inside the castings or the large holes at the confluence of the alloy liquid can be found in the machine.
Reasons for the appearance of vortex holes:
1. The direction in which the alloy liquid is introduced into the cavity is incorrect, scouring the cavity wall or core, generating eddy currents, and enveloping the air; 2. The injection speed is too fast and it is caught by the pouring port Gas; 3. The inner gate is too thin, the alloy liquid moving speed is too large, causing spraying and splashing, and blocking the exhaust groove prematurely; 4. The position of the exhaust groove of the mold is wrong, or the outlet section is too small, so The venting ability of the mold is poor, and the back pressure of the air cushion in the cavity is large; 5. The position of the cavity in the mold is too deep, and the position of the venting groove is improper or too small; 6. The gap between the punch and the pressure chamber is too small, the punch When the return is too fast, a vacuum is formed, and the uncondensed alloy liquid is drawn back to form pores; or the punch returns too fast; 7. The volume of the pressure chamber is large and the amount of alloy liquid poured is too small.