大型板类锻件的锻造

常规锻造工艺生产大型板类锻件时，由于大型板类锻件的尺寸待征，无法满足高度方向压下时其砧宽比和料宽比不出现拉应力的条件，因而在锻造过程中，在其材料组织的晶界或晶界薄弱处容易形成新的裂纹源。通过对超声探伤报废的2块板类锻件(模块)进行解剖试验，其结果证明了这一论断。为了克服大型板类锻件的锻造工艺的缺点，根据锻造理论和工艺的最新研究成果，提出了锻造大型板类锻件的新FM锻造法。用新FM法锻造板类锻件，可有效地控制工艺参数，防止在变形体内产生形成裂纹的机制，并可大幅度降低板类锻件的废品率。将该工艺用于大型锻件的生产与修复中，也是非常有效的。

Forging technology of heavy platen-shaped forgings

When producing heavy platen-shaped forgings with conventional forging processes, due to the aspect features of the said forgings, it is difficult to meet the requirements that anvil-width ratio and blank-width ratio should be big enough to prevent tensile stress when the forgings are compressed in the height direction. Therefore, cracks tend to germinate at the crystal borders and brittle parts in the deformation bodies. The viewpoint is testified by dissecting experiment of two-piece platen-shaped forgings failing in the supersonic inspection. To overcome the shortcomings of the conventional forgings process, the paper proposes the optimal forging technology, namely, New FM Forging Method, for heavy platen-shaped forgings, based on the current research achievements. The new FM Forging Method with suitable processes parameters can be used to guaranty the mechanism that cracks do not germinate in the deformation bodies. It is verified by production practice that the new FM Forging Method can produce the mechanism and decrease greatly the reject ratio of heavy platen-shaped forgings. The technology can be applied for the production and recovery of heavy forgings effectively and expects to be applied widely.