锻压技术

径向加载变形工艺对锻件带状组织产生内裂纹的影响

英文标题：Influence of radial loading technique on inner crack produced in forging banded structure

关键词：锻件缺陷带状组织径向加载

分类号：

出版年,卷(期):页码：2015,40(10):11-15

摘要：

由于钢球锻件原材料存在3～4级的带状组织，导致在实际生产中，钢球成品在沿原材料带状组织分布方向出现内部孔洞、裂纹，严重影响钢球使用寿命和球磨机的质量。在不改变原材料情况下，对存在带状组织缺陷的原始棒料进行研究，使其主变形方向由最初的沿棒料轴向变形改为沿着棒料径向变形，使棒料的主变形方向与带状组织分布方向垂直。模拟实验表明，在锻造变形的过程中，沿着棒料径向变形可以避免因带状组织产生的裂纹，有效防止微裂纹产生和在之后热处理工艺中的进一步扩大；并且使锻造比由之前1.3增大到3.2。实验结果表明，通过该方法得到了晶粒更为细小、性能更好的钢球锻件。

The existence of banded structure with grade 3-4 in the raw material of steel forging resulted in internal holes and cracks along the direction of banded structure distribution of raw material in the actual production for steel ball products，which seriously affects the quality of the service life of the steel ball and ball mill. The raw material with banded structure defects was researched without changing the raw materials, the main direction of deformation was changed from the original axial deformation into the radial deformation，which was vertical to the direction of banded structure distribution. Simulation experiments show that in the process of forging, the radial deformation along the bar can avoid cracks resulted from the band structure, and effectively prevent it from the cracks and expand them continually after heat treatment with forging ratio increasing from 1.3 to 3.2. A more fine grain and better performance of the steel ball forging is obtained and it is verified by experiment through above method.

基金项目：

周弘庆（1990-），男，硕士研究生

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