Patent DE-102010020402-B3 (DE)
Title: Device for aerating a casting mold in the form of a chill-vent, comprises two mold halves, which are opposite to each other and have elevations and/or depressions running parallel to each other in their compatibly pointing surfaces
IPC: B22D17/20
Filed: 2010-05-12
Granted: 2011-09-29
Abstract: The device for aerating a casting mold in the form of a chill-vent, comprises two mold halves (02a, 12a), which are opposite to each other, are shape-complementary and functional-complementary to each other and have elevations and/or depressions running parallel to each other in their compatibly pointing surfaces and transverse to a flow direction in such a way that in compatibly set mold halves, the elevations of one mold half engages into the depressions of the second mold half. A washboard or a meander-shaped gap (07) is formed between the mold halves. The device for aerating a casting mold in the form of a chill-vent, comprises two mold halves (02a, 12a), which are opposite to each other, are shape-complementary and functional-complementary to each other and have elevations and/or depressions running parallel to each other in their compatibly pointing surfaces and transverse to a flow direction in such a way that in compatibly set mold halves, the elevations of one mold half engages into the depressions of the second mold half. A washboard or a meander-shaped gap (07), through which air (10) and excess molten material (11) displaced from the mold flows during filling the casting mold, is formed between the mold halves. The device has a channel-like cavity (06a) extending the gap in the gap progression widening itself over the entire width of the device. The cavity is arranged in first third of the device between the inlet and the outlet of the device related to the flow direction. The cross-section of the cavity is constant over its length, and is rectangular, rhombic or polygonal. The rectangular cavity is arranged, so that two sides run parallel to the longitudinal direction of the device and two sides perpendicular to it. The gap flows into the cavity in the cross-section at the inlet-side in the area of a corner of the cavity and the gap exits from the diagonally opposite corner at the outlet side. The rhombic cavity is arranged, so that two sides run parallel to the longitudinal direction of the device and two sides run parallel to each other at an angle of 60-90[deg] to the longitudinal direction of the device. The gap flows into the cavity in the cross-section at the inlet-side in the middle area of the side of the cavity and the gap exists in the area of the corner at the outlet side. The cross-section of the cavity is circular, elliptical or ellipsoid. The cavity is formed by two circular arc-shaped half shells, where the first half shell is formed in the first mold half and the second half shell is formed in the second mold half. The gap tangentially flows to the first half shell in the cavity at the inlet side. The arc radius of the first half shell is slightly smaller than arc radius of the second half shell. The ratio of the cross-sectional area of the cavity relative to the gap width mathematically in square is 25-100. The ratio of the height of the cavity in longitudinal direction of the pre-direction relative to the gap width and the ratio of the width of the cavity transverse to the pre-direction relative to the gap width is 5-10. The ratio without dimension of the length of the device in mm relative to the gap width in mm mathematically in square is less than 160.