冲裁间隙对断面质量影响实验方案及模具设计 摘要 冲裁在金属塑性变形中是一个特别重要的步骤，在机械制造加工中也具有很重要的地位。冲裁间隙不管是在模具设计中还是在加工工艺过程中都扮演着一个不可缺少的角色，冲裁间隙不仅影响操作过程中的冲压力和尺寸大小，而且还对横截面的质量有影响，尺寸的精确度，和模具的使用寿命都会随着冲裁间隙的选取而改变。 本次设计我所研究的课题是冲裁间隙对断面质量影响的实验方案及模具设计。通过对冲裁模间隙的偏大、偏小还是合理的研究，发现横截面的质量会有怎样的改变，本设计所采用的的材料是Q235，首先分析他的材料力学性能及冲裁间隙对断面质量的影响。根据不同的尺寸的冲裁件，设计出不同大小的凸模和凹模，分析其中的区别，最终确定最合理间隙的冲裁模具来延长模具的使用寿命。 关键词：冲裁冲裁间隙断面质量 ABSTRACT Bla
nki
ng is a particularly importa
nt step i
n the plastic deformatio
n of metals a
nd plays a
n importa
nt role i
n mecha
nical ma
nufacturi
ng. The bla
nki
ng gap plays a
n i
ndispe
nsable role i
n both the mold desig
n a
nd the machi
ni
ng process. The bla
nki
ng gap
not o
nly affects the pressi
ng force a
nd size duri
ng the operatio
n, but also affects the quality of the cross sectio
n. The accuracy, a
nd the life of the mold, will vary with the choice of the pu
nch gap. This graduatio
n project is a
n experime
ntal pla
n a
nd mold desig
n to explore the impact of the bla
nki
ng gap o
n the quality of the sectio
n. Through the study of the large, small or reaso
nable study of the gap of the bla
nki
ng die, the i
nflue
nce law of the quality of the bla
nki
ng sectio
n a
nd the i
nflue
nce of the mecha
nical properties of the material o
n the quality of the sectio
n are fou
nd. The material used i
n this desig
n is Q235. Firstly, the mecha
nical properties of the material a
nd the i
nflue
nce of the bla
nki
ng gap o
n the quality of the sectio
n are a
nalyzed. Accordi
ng to differe
nt sizes of pu
nchi
ng parts, differe
nt sizes of pu
nches a
nd dies are desig
ned, a
nd the differe
nces are a
nalyzed, a
nd the pu
nchi
ng dies with the most reaso
nable cleara
nce are fi
nally determi
ned to exte
nd the service life of the dies. Key words: bla
nki
ng pu
nchi
ng cleara
nce sectio
n qualit 目录 摘要I ABSTRACT II 第一章绪论1 1.1研究背景及意义1 1.2课题研究现状1 1.3主要研究内容3 第二章冲裁加工工艺原理4 2.1冲裁变形过程4 2.2冲裁件断面特征及其影响因素5 2.2.1冲裁件断面特征5 2.2.2材料性能对断面质量的影响6 2.2.3模具冲裁间隙对断面质量的影响6 2.2.4模具刃口状态对断面质量的影响7 2.3冲裁件尺寸精度及其影响因素8 2.3.1冲裁间隙的定义8 2.3.2影响冲裁件尺寸精度的因素9 第三章确定冲裁间隙试验方案10 3.1冲裁间隙研究方法的确定10 3.2确定模具总体结构设计10 3.3工作零件设计与标准的选用11 3.3.1模具间隙的确定11 3.3.2凸、凹模刃口尺寸计算13 第四章冲裁工艺设计17 4.1冲裁件的工艺性分析17 4.2排样设计18 4.3冲裁工艺力与压力中心计算21 4.3.1冲裁力计算21 4.3.2卸料力、推件力和顶件力的计算21 4.3.3压力中心的计算22 4.3.4压力机的选取原则23 4.4工作零件的设计23 4.4.1凸、凹模刃口尺寸计算23 4.4.2凹模设计24 4.4.3零件的设计27 4.4.4凸模设计29 4.4.5模架设计29 4.4.6校核初选的设备30 4.5绘图32 第五章总结34 附录36 致谢42