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机器锻造是自由锻造的主要方法，可锻造质量达到几百吨的大型锻件，这使得自由锻在重型机械制造中具有特别重要的作用。例如，水轮机主轴、多拐曲轴、大型连杆、重要的齿轮零件，在工作时都承受很大的载荷，常采用自由锻造方法生产毛坯，使其具有很高的力学性能.满足使用要求。低塑性拔长时，应注意选择合适的送进比，送进比太小时，变形集中在上下部，中心都锻不透，并沿轴向产生拉锻造应关于锻件的一些基本知识力，导致内部横向裂纹产生。

Machine forging is the main method of free forging. It can forge large forgings with a quality of hundreds of t***, which makes free forging play a very role in he***y machinery manufacturing. For example, the main shaft of a hydraulic turbine, a multi crank crankshaft, a large connecting rod, and important gear parts are subjected to he***y loads when they are working. Free forging is often used to produce blanks, so that they h***e high mechanical properties.

自由锻造所用工具和设备简单，通用性好，成本低。 同铸造毛坯相比，自由锻消除了缩孔、 缩松、气孔等缺陷，使毛坯具有更高的力学性能。锻件形状简单，操作灵活。

Free forging tools and equipment are simple, versatility and low cost. Compared with the casting blank, the free forging eliminates the defects such as shrinkage porosity, porosity, porosity and so on, so that the blank has higher mechanical properties. The shape of the forgings is simple and the operation is flexible.

自由锻造是靠人工操作来控制锻件的形状和尺寸的，所以锻件精度低，加工余量大，劳动强度大，生产率也不高，因此它主要应用于单件、小批量生产。

Free forging is by manual operation to the shape and size of the forgings, so the precision of the forgings is low, the processing allowance is large, the labor intensity is big, and the productivity is not high. Therefore, it is mainly used in single piece and ***all batch production.