笔记本电脑上壳冲压模设计解析

分类号:

单位代码:10452 毕业论文（设计）

笔记本电脑上壳冲压模设计

姓名

学号

年级

专业

系（院）机械工程学院

指导教师

2016年3月30日

摘要

笔记本电脑由于携带方便而广受欢迎。轻量化是笔记本电脑的发展趋势，因此外壳制造使用镁合金材料，上壳的制造采用冲压模具。材料确定后要查表并计算修边余量，然后确定毛坯外形及查表得出计算公式计算尺寸，然后查表得出拉深次数，其中要确定加工工艺为落料、拉深、冲孔、修边。设计冲裁工序时要先由公式计算冲裁力，然后查表得出顶件力系数，由公式可计算出顶件力大小，再加上冲裁力和推料力就得出了压力机要提供的力，由此选择压力机型号，再由公式和查表计算出落料件尺寸和精度即可。拉深工艺计算时先查表得出抗拉强度和系数，再由公式计算拉深力。再查表得出计算公式并计算压边力，将二者加起来就得到了压力机应提供的总压力，由此选择压力机型号。设计冲孔工序时，由公式计算冲孔力、推料力和卸料力，其中的系数查表可得。

关键词：镁合金；冲裁；拉深

ABSTRACT

The notebook computers are widely used in recent years because it is easy to carry. The development trend of notebook computer is light weight, so the shell of computers is made by magnesium alloy material, and the manufacture of the shell use the stamping die. After the determination of the materials, look-up the table to calculate the trimming allowance, and determine the blank shape. And then according to look-up table to calculate the size, check table to attain the number of drawing, determine the processing technology for falling material, drawing, punching and trimming. When design the blanking process, it needs to finish the formula calculation of blanking force and look-up table to get the top force coefficient. By formula the force size together with the punch force and pushing force to attain the needed pressure force, then choose the type of press. By the formula and look-up table calculation to choose the blossoming materials size. During the drawing process calculation, the first step is look up the table to draw the tensile strength and coefficient, and then according the formula to calculate the drawing force. Then look at the table to calculate the formula and calculate the pressure side force, then will get the total pressure of the press should be provided, which select the type of press. In the process of punching design, according to the formula to design the punching force, pushing force and unloading force.

Key words: Magnesium alloy; punching; drawing

目录

1绪论 (1)

1.1选题背景及目的 (1)

1.2国内外研究状况 (2)

1.3课题研究方法 (2)

1.4论文构成 (2)

2冲压工艺规程的编制 (3)

2.1冲压件的工艺分析 (3)

2.1.1材料 (3)

2.1.2结构工艺性分析 (4)

2.2确定毛坯形状及尺寸 (4)

2.2.1计算修边余量 (5)

2.2.2确定盒形件的毛坯尺寸 (6)

2.6毛坯尺寸、外形 (7)

2.3排样设计及材料利用率计算 (8)

2.3.1排样方式 (8)

2.3.2求材料利用率的大小 (8)

2.4确定工艺方案 (8)

2.4.1确定基本工序 (8)

2.4.2比较不同加工方案 (8)

2.5工艺计算 (9)

2.5.1落料工序 (9)

2.5.2拉深工序 (11)

2.5.3冲孔工序 (12)

2.5.4修边工序 (12)

2.6冲压工艺过程卡片 (13)

3拉深模设计 (16)

3.1模具的结构形式 (16)

3.2计算模具的刃口尺寸 (16)

3.2.1计算上下模刃口尺寸 (16)

3.2.2计算压力中心 (17)