碾环是指通过专用设备碾环机生产不同直径的环形零件，主要用来生产汽车轮毂、火车车轮等轮形零件。特种锻造包括辊锻、楔横轧、径向锻造、液态模锻等锻造方式，这些方式都比较适用于生产特殊形状的零件。
Roller ring refers to the production of circular parts with different diameters through the roller ring machine of special equipment, which is mainly used to produce wheel hub, train wheel and other wheel shaped parts. Special forgings include roll forging, cross wedge rolling, radial forging, liquid forging and so on. These methods are suitable for producing parts with special shape.
锻造生产加热设备和锻压设备不可少，这些设备释放大量热能，需要我们在通风净化环境中进行。锻造工具种类繁多，也是密集型作业，要求每个技术人员都不能马虎，坚守自己的岗位，嘈杂的环境需要冷静的技师，不能随意操作。
Forged production of heating equipment and forging equipment can not be less, these release a large amount of heat energy, we need to carry out in the ventilation and purification environment. There are various kinds of forging tools, which are also intensive operati***. Every technician is not allowed to be careless and stick to their. The noisy environment needs a cool technician and can not be arbitrarily operated.
自由锻造所用的工具简单，加工方法通用性强，生产准备周期短，因而应用较为广泛。自由锻分为手工锻造和机器锻造两种。手工锻造只能生产小型锻件，生产率也较低。
The tool used for free forging is simple, the versatile and the production period is short, so it is widely used. Free forging is divided into two kinds: manual forging and machine Manual forging can only produce ***all forgings, and the productivity is low.