According to the structure and wall thickness of the casting, it is divided into 20 unit bodies, and the module size of the corresponding unit body is calculated (see Table 2). The location of the pyrolysis and the equalization section are found to apply the large-hole outflow and the equilibrium solidification. The theory calculates the casting system of the casting separately and judges the corresponding drainage position. Using the balanced solidification theory to design the riser process parameters, the contraction modulus of the rear axle Mc=0.76cm; Qm=214kg/cm3Pc=1.0/exp(0.65Mc+0.01Qm)=0.072f2=Pc=0.072=0.27Ms=f2Mc=0.27× 0.76=0.2(cm) In the formula, Mc-casting module number, for multiple feeders, refers to the part of the casting module covered by the design feeder feeding; Qm-quality perimeter quotient; Pc-contracting time Score; f2 - contraction modulus factor. The calculation of the overall module MR of the feeder MR = f1f2f3Mc The balance factor of f1 - riser, generally f1≥1.2; f3 - riser pressure factor; f3 is related to the perimeter of the casting, the quality of the casting is small , f3 is small, the quality of castings is large, the general weight is large, and f3 is also large. Value f1=1.2, f2=0.27, f3=1.5, Mc=1.4cm; MR=f1f2f3Mc=0.68cm. Ripper neck modulus MNMN=fpf2f4Mc fp-flow effect factor, fp = 0.45 ~ 0.55; f4 - riser neck length factor, riser neck length, f4 value is large, short mouth neck, f4 value is small MN - Modulus of rising neck. The value f2=0.27, fp=0.5, f4=0.9; MN=fpf2f4Mc=0.18cm. Data Analysis To sum up, the riser modulus calculated according to the equilibrium solidification theory is MR=0.25cm, and the number of riser necks is MN=0.1mm; the result calculated by the contraction modulus method is: MR=0.68cm, MN= 0.18cm. According to the result of the table lookup, the theoretically calculated riser is very small. According to the theory of balanced solidification and no riser, Zhou Jieshang (the Zhoujie quotient is a parameter describing the degree of compaction of castings, which reflects the combination of thick-walled and thin-walled parts in the casting structure): Qm≥20kg/cm3, abundant The thin wall can realize no casting; therefore, according to Qm ≥ 214kg/cm3, the quality of the rear axle is chosen and no casting is used [1]. The pressure riser method is used to design the technological parameters of the riser. The geometric modulus of the rear axle casting is 0.76cm, that is, Mc>0.48cm; at the same time, the casting is a wet type casting of KW line, so the control pressure riser in the practical feeder is used to design Riser's process parameters. First, calculate the modulus of its riser neck: Ms=M5=1.4cm; tp=1350°C; L=209J/g; c=0.835g/J.°CMN=Ms(tp-1150°C)/(tp- 1150 °C + L / c) = 0.62cm where c - is the specific heat capacity of molten iron; L - the latent heat of cast iron; tp - the average temperature of the molten iron after casting. Conclusions (1) Computer-aided calculation of the casting modulus is applied. Calculate the size, number, and position of the riser using the theory of balanced solidification and traditional theory respectively, and calculate the gating system using the large hole outflow theory. The entire calculation process is precise and rigorous. In the process of pouring time and calculating the cross-sectional area of ​​the baffle, the shape factor of the casting is fully taken into consideration, so that the calculated result is more reasonable and accurate. (2) Optimized process design results Compared with FAW's production use plan, 2 risers are reduced, and the process yield of castings is increased from 83% to 92%, and the process is more convenient. Mold manufacturing and worker operation are more convenient.
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Relying on Hole Conductance and Homogenization Curing Theorem for Automobile Frame Metallurgy and Design