During the mold production of aluminum alloy die castings, the quality inspection of the final heat treatment usually consists of inspections after quenching, surface quenching, and tempering, among other things. Everything you need to know about the final inspection of mold heat treatment for aluminum alloy die casting is right here.
Die Casting of Aluminum Alloy with Final Inspection of Mold Heat Treatment
1. Deformation of the body. The quenching deformation must be checked in accordance with the specifications. If the deformation exceeds the limits of the regulations, Aluminum die casting must be straightened once more. If aluminum die casting is not possible to straighten aluminum die casting parts for some reason, and the deformation exceeds the machining allowance, Aluminum casting factory may be possible to repair aluminum die casting with special tools. The method is to quench and temper the mold parts of aluminum alloy die casting after they have been soft straightened in order to meet the specifications. General rule is that after quenching and tempering, the deformation of aluminum alloy die casting mold parts cannot exceed 2/3 to 1/2 of the allowance.
2. Cracking the ice. The surface of any aluminum alloy die casting mold parts must be free of cracks; therefore, the heat-treated parts must be thoroughly inspected. Aluminum casting factory is necessary to inspect the stress concentration parts, such as sharp corners, keyways, thin-walled holes, thickness junctions, protrusions and depressions, among other things.
3. Overheating and burning to a crisp. A metallographic microscope is used to detect overheating and overburning in metal parts. After quenching, it is not permitted for the mold parts of aluminum alloy die casting to have coarse needle martensite overheating structure or grain boundary oxidation overburning structure, because overheating and overburning will reduce strength and increase brittleness, making the parts more prone to cracking during the casting process.
4. Oxidation and decarburization are two processes that occur. Controlling the oxidation and decarburization of aluminum alloy die casting mold parts with a small machining allowance is critical because aluminum die casting parts can lead to premature failure. Cutting tools and abrasives are not permitted to be decarburized under any circumstances. Significant oxidation and decarburization in quenched parts indicates that the heating temperature was either too high or the holding time was too long, necessitating the performance of an overheating inspection in conjunction with the quenching inspection.
5. Maintain a soft demeanor. Soft spots will cause wear and fatigue damage to aluminum alloy die casting mold parts, so there will be no soft spots in the casting process. The most common causes are incorrect heating and cooling, uneven structure of raw materials, banded structure, and residual decarburization layer, among other things. When soft spots appear, they must be repaired as soon as possible.
6. Insufficiency of toughness. A high heating temperature and excessive residual austenite will result in a reduction in hardness when quenching aluminum alloy die casting mold parts. A low heating temperature and insufficient holding time, as well as an inadequate quenching cooling speed and improper operation, will result in a lack of hardening hardness when quenching aluminum alloy die casting mold parts. The above-mentioned conditions can only be corrected.
7. The use of a salt bath furnace. High and medium frequencies, as well as a flameAluminum alloy die casting mold parts that have been quenched are not to be burned.
When finished with final heat treatment, the surface of aluminum alloy die casting mold parts should be free of corrosion, bumps, shrinkage, damage, and other flaws, among other things.