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研究2吨以上锻锤垫木的应用问题是一个具有普遍意义的课题,其主要内容有:一,垫木材种的选用及其物理、力学性能;二,含水率对垫木开裂变形性能的影响;三,垫木材质要求及木材主要疵病对强度的影响。据《动力机器基础设计规程》(草案)(以下简称《规程》)规定:用于2吨以上锻锤垫木的材料,须采用柞木或水曲柳。木材计算强度指标:横纹承压力30公斤/厘米~2;横压弹性模量为5000公斤/厘米~2。垫木绝对含水率不大于20～25%;垫木材质要求应为一级品。
Study on the application of more than 2 tons forging hammer wood is a subject of general significance, the main contents are: First, the choice of mat species and its physical and mechanical properties; Second, the moisture content of the impact of deformation of the mat performance ; Third, the mat material requirements and the main wood defects on the strength of the impact. According to “Power Machinery Basic Design Code” (Draft) (hereinafter referred to as the “Regulations”) provides: for more than 2 tons forging hammer wood materials, must use oak or ash. Wood calculated strength indicators: horizontal pressure 30 kg / cm ~ 2; transverse elastic modulus of 5,000 kg / cm ~ 2. Cushion moisture content is not greater than 20 to 25%; mat material requirements should be a product.