• CN：11-2187/TH
• ISSN：0577-6686

›› 1990, Vol. 26 ›› Issue (3): 87-93.

• 论文 •

### 铸造砂型常温力学模型的系统辨识研究

1. 华中理工大学
• 发布日期:1990-05-01

### THE SYSTEM IDENTIFICATION OF MECHANICAL MODELS OF SAND MOLDS AT ROOM TEMPERATURE

Luo Aihua;Wang Wenqing;Dai Xuqi;Su Guoxun

1. Huazhong university of Science and Technology
• Published:1990-05-01

Abstract: By means of system identification, three types of mechanical models of sand molds at room temperature were developed in this paper:(1)cohesive model σ=K0+K1b; (2)adhesive model σ=K”0+K”1b+K”2b,(K =K”1/K”2＜10）; (3)mixed model σ=K”0+K”1b+K”2b,( K =K”1/K” ≥10).The precision of the models was within 0.2.The conclusions of system identification of models are as follows: (1) Silica bonded sand molds can be expressed as cohesive models, and the most effective method to improve the mechanical properties of them is the modification of the binders. (2) Clay-bonded sand molds can be expressed as mixed models, and the most effective method to improve the mechanical properties of them is in conjunction with other binders. (3) Resin-bonded sand molds can be expressed as adhesive models, and the most effective method to improve the mechanical properties of them is to increase the adhesive force between resin and sand grain .In addition, the addition of silage increased the adhesive force between sand grain and resin ,changed the models of sand molds from adhesive ones to cohesive and mixed ones ,and as a result, the mechanical properties of molds were greatly improved.