Method for improving casting quality
A process method and low-pressure casting technology, applied in the field of casting, can solve the problems of reduced casting quality, increased risk of casting shrinkage and inclusions, etc., to improve quality, reduce the risk of oxidation inclusions and shrinkage cavities, and achieve precise control. Effect
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Embodiment 1
[0044] Embodiment 1: low-pressure casting A356 aluminum alloy wheel hub.
[0045] Refining A356 aluminum alloy at 630°C, adding it to a low-pressure machine holding furnace for heat preservation after refining, using air to apply a net pressure of 10000Pa, and pressing a 400mm metal melt into a solenoid coil with a length of 400mm and a number of turns of 20. The diameter is In the middle heating zone of 180mm, the molten metal stays in the heating zone for 60s and is heated to 710°C or higher. The distance between the middle heating zone and the liquid surface of the liquid pool in the holding furnace is 200mm. Since the melt diameter reaches 150mm, the frequency is 5000Hz. The insulation filling factor of the coil is 0.85, and the radial thickness of the coil conductor section is 30mm.
[0046] The required effective power P in the heating process 1 It is calculated to be 57.74kW, and A is 0.35 in the current embodiment, K 2 Take 0.82, K M Take 0.8, K r Taking 1.1, the ...
Embodiment 2
[0047] Embodiment 2: differential pressure casting A356 aluminum alloy steering knuckle.
[0048] Refining the A356 aluminum alloy at 650°C, adding it to the liquid pool of the low-pressure machine to keep warm after refining, preheating the die-casting mold to 180°C, using the pressure difference between the upper and lower pressure cylinders to provide an upward net pressure of 12000Pa, and pressing a metal melt with a length of 500mm into the Located in a riser pipe with a diameter of 150mm in a solenoid coil with a length of 200mm and a number of turns of 20, the pressure is reduced so that the metal melt stays in the heating zone for 30s, heated to 750°C, the middle heating zone and the holding furnace The distance between the liquid surface of the liquid pool is 200mm. Since the melt diameter reaches 150mm, the frequency is 5000Hz. The insulation filling factor of the coil is 0.85, and the radial thickness of the coil conductor section is 30mm.
[0049] The required ef...
Embodiment 3
[0050] Embodiment 3: YL101 aluminum alloy front wheel cover was cast by high pressure casting process.
[0051] Melt 300kg of YL101 aluminum alloy at 650°C, add it to the liquid pool of the low-pressure machine to keep it warm after refining, preheat the die-casting mold to 180°C, use the injection mechanism to provide a pressure of 5MPa, and press a metal melt with a length of 300mm into a metal melt with a length of 500mm. In the middle heating zone with a diameter of 200mm in the number of 20 solenoid coils, the pressure is reduced so that the metal melt stays in the heating zone for 20s and heated to 740°C. The ratio of melt diameter to skin depth is 3, then δ is 0.033m, and the frequency is 60Hz. The insulation filling factor of the coil is 0.85, and the radial thickness of the coil conductor section is 30mm.
[0052] The required effective power P in the heating process 1 It is calculated to be 47.57kW. In the current embodiment, A is 0.35, and K 2 Take 0.74, K M Tak...
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