The calculation of the length slag trap to the first feeder
For quality castings necessary to prevent non-metallic inclusions in the mold cavity. To ensure the specified requirements necessary to ensure the proper operation of the cell gating system - slag trap. It is necessary to ensure that during flow along the entire length slag trap slag particles, even those who initially were on bottom surfaced over the full height of the channel. slag trap in flow rate should be such that the metal flow could not entrain the particles already in its pop-top. This becomes possible when the flow rate does not exceed a certain limit value. In today's foundries are a lot of methods for calculating gating systems on which the findings are different. This article summarizes data on critical flow rate, the flow of metal to the slag particles of iron-carbon alloys, as well as the average ramp rate of the metal in the mold. Calculations gating systems by standard techniques and methodology proposed by the authors, slag trap calculations made taking into account that the gating system in this case should be closed. It is shown that not all the methods give adequate results, as standard methods of calculation adopted by the weight of the gating system oscillating in the range of 10-20%. Drawing the method of calculating the gating system, based on the critical velocity of flow of the metal in slag trap gives the results of calculations in the form of cross-sectional dimensions of elements and the length of the gating systems slag trap, based on specified parameters foundry and model guidance, unlike conventional techniques.