球化率对精冲钢的冲压性能的影响研究+文献综述
关键词：精冲；精冲用钢；球化率；球化退火
Abstract Fine-blanking belongs to the chipless machining technique. It is developed from normal stamping technique. With the development of the fine-blanking technique, the fine blanking technique has widely used in various industry fields. As a result, the requirements of the fine-blanking parts, such as production quality, size and shape, the thickness of the material and mechanical properties, have been higher and higher .In addition, the requirement of stamping performance of the fine-blanking steel is also higher. Through the fine-blanking steel cold rolling and annealing Spheroidization rate,I analyzed the impact of the original issue, heating speed, soaking time and cooling time of different annealing process on the steel’s Spheroidization rate.Through the experiment, I analyzed the impact of the Spheroidization rate on the stamping performance of the fine-blanking steel. In order to improve the stamping performance, we need to make better annealing technique for better Spheroidization rate effects.
Keywords：fine-blanking；fine blanking steel；spheroidization rate；spheroidizing annealing
目录
1 绪论 4
1.1 精冲的定义及应用 4
1.1.1 精冲的定义及其特点和工艺 4
1.1.2 精冲的应用 4
1.2 精冲的发展历史 7
1.3 精冲的发展现状 7
1.3.1 强力压边精冲一枝独秀 7
1.3.2 世界精冲市场快速扩展 8
1.3.3中国精冲市场稳步前进 8
1.4精冲用钢的性能要求 10
1.4.1 精冲用钢的性能要求 10
1.4.2 精冲难度分类 11
1.5球化退火与精冲用钢的性能之间的影响关系 13
1.6球化退火工艺的影响因素 14
1.6.1球状碳化物的形成过程 14
1.6.2碳化物球化的影响因素 17
2 实验材料及研究方法 24
2.1 实验材料 24
2.2 实验设备 24
2.3 实验方案 24
2.3.1 拉伸实验 24
2.3.2 再结晶退火实验 26
2.3.3 球化退火实验 28
2.3.4微观组织观察 29
3 实验结果 29
3.1 拉伸实验结果 29
3.1.1 S15C实验材料 29
3.1.2 S45C实验材料 30
3.2 再结晶退火实验结果 31
3.3 球化退火与微观组织观察实验结果 40
3.3.1缓慢冷却球化退火 40
3.3.2 等温球化退火 43
3.4经球化处理后试样的拉伸实验 45
4 实验结果分析 47
4.1热处理工艺对材料强度影响 47
4.2热处理工艺对材料组织的影响 48
4.3材料组织与材料强度关系 48