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若用φ90×150毫米的圆料锻造如图1所示的工字形齿轮,锻工手册上介绍的是先将一头拔细,再分别镦粗两端,一般需三火成型。若用摔子先将工件中部拔细,再在套模中同时将两端镦粗、可以两火成型。但由于成坯摔子固定性不好,上、下摔子在锤击的作用下,容易左右摆动,工件颈部长度尺寸很不稳定,往往超过设计尺寸,这样在最终成型的过程中,压缩量过大,容易在颈的中部和R6处产生圆周性的横向折叠。另外,一般用d_D=70毫米和d_D=58
If the use of φ90 × 150 mm forging round as shown in Figure I-shaped gear, forging manual is introduced first a drawing, and then were upset ends, generally require three fire forming. If the first use of the wrestler to pull the middle of the workpiece, and then die in both ends of the upsetting, you can two fire forming. However, due to the poor stability of the blank-shaped wrestling, the impact of the upper and lower wrestling in the hammer, easy to swing around the workpiece neck length size is very unstable, often exceed the design size, so that the final molding process, compression The amount is too large, easy to produce in the middle of the neck and R6 at the Department of the circular lateral fold. In addition, d_D = 70 mm and d_D = 58 are generally used