对热处理过程中变形及开裂问题 毕业论文

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1、题目：对热处理过程中变形及开裂问题学生姓名：所学专业：指导教师：黑龙江农垦农业职业技术学院年月日黑龙江农垦农业职业技术学院毕业论文（设计）申请表学生姓名学号所学专业所在系部毕业论文（设计）选择题目编号：题目：系部审批：年月日黑龙江农垦农业职业技术学院毕业论文（设计）任务书论文题目毕业论文（设计）的要求：主要参考资料：学生（签名）年月日指导教师（签名）年月日黑龙江农垦科技职业学院毕业论文（设计）评语论文题目指导教师评语:指导教师签字:年月日评审委员会评语:评审委员会专家签字:年月日最后成绩：学生毕业论文答辩情况表答辩人姓名所学专业导师

2、姓名、职称答辩日期年月日论文题目答辩委员会成员姓名职称所在单位签名组长成员系教研室主任或秘书答辩中提出的问题及回答的简要情况（如不够填写可另附纸）答辩委员会组长（签名）教研室主任或秘书年月日目录引言····································...........................·········11.热处理变形及开裂的原因························21.1热应力及其引起的变形·······················21.2组织应力及其引起的变形········

3、·············31.3温度是变形的关键因素·······················42.影响开裂的因素································42.1钢的化学成分·······························42.2钢的淬透性·································52.3钢的原始组织·······························52.4淬火介质···································52.5零件的几何尺

4、寸·····························62.6淬火的方法·································63.减少变形及开裂的措施··························63.1合理的选用钢材·····························63.2合理的选择加热温度·························63.3合理锻造及预先热处理·······················63.4合理设计工件的结构尺寸·····················73.5采用合

5、理的热处理工艺·······················73.6采用正确的淬火操作方法·····················73.7预备合理的加工余量·························83.8合理的安排工艺路线·························83.9修改技术要求·······························83.10按变形频率调节加工尺寸····················84.变形的其他影响因素及减小措施···················84.1合理的加热次序和冷却

6、次序··················84.2预备热处理································94.3运用合理的冷却方法························94.4零件结构要合理····························94.5采用合理的装夹方式及夹具··················94.6机械加工··································94.7采用合适的介质····························10结束语············

7、·······························11参考文献·········································12引言变形是指零件在热处理时引起的形状和尺寸的偏差。变形是热处理较难解决的问题，要完全不变形时不可能的，一般是把变形量控制在一定范围内。超过变形量时，只能用校正法校正。开裂是绝对要避免的，因为开裂零件无法挽救，只能报废，这既浪费了材料与加工费用，又影响了生产，给国家造成损失。因此，分析研究金属热处理变形、开裂的原因，掌握其规律性，并找出减小变形、防止开裂的技术措施，具有十分重要

8、的意义。工业发展日新月异，对机械精度和性能的要求也越来越高。在工业零件生产中，热处理是必不可少的一部分，它对材料性能的影响非常大，金属热处理在改善材料各种性能的同时，热处理变形是不可避免的，并且会直接影响到工件的精度、强度、噪声和寿命