前几天一个同学拿订书钉型号,折下那个弯曲的...

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订书机外壳注射模设计(全套CAD图纸).doc48页
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订书机外壳注射模设计
摘要:本毕业设计说明书详细介绍订书机外壳塑件的注射模设计。主要内容是材料 聚丙稀PP 特性分析,塑料注射模的结构设计、标准件的选择、模具材料选择、典型零件的数控加工3G程序代码编程设计。该塑件外表面要求达到境面,内部有弯曲的加强肋,底部进行文字加工,不但有外侧抽芯成型两个圆柱孔、两个半圆柱孔及圆柱孔旁边的浅孔,还有内侧抽芯成型内部四个突台。外侧抽芯距离短,模架小,在型腔板上固定弯销来实现侧抽芯。由于塑件中部有两不易成型的圆肋,采用了增加两个小型芯镶件的办法减少加工模具的难度。整体外形为曲面,不能用传统的加工工艺,而是在Pro/E建模的基础上电火花成型。
关键词: 订书机外壳;注射模设计;侧抽芯;曲面
The Design of the Book Sewer outside Shell Injection Mold
Abstract: This graduate design instruction book has introduced the design of the book sewer outside shell injecting molding in detail. It mainly contains the analysis of property of the material
polypropylene PP , the structural design of injection mold, the selection of standardized part and the material of injection mold, the 3G code NC part programming for typical part. The surface of this plastic part should be mirror finished. The inside of it has bending reinforcing rib. The bottom of it should be worked with words. It not only has two cylindrical pore、two half cylindrical pore and short-hole beside the cylindrical pore that should be formed by outside extracting part, but also has four lug formed by inside extracting part. The distance of extracting is short and the mould is small, so fixing angle block on the cavity die is to finish outside extracting. Because the inside of the plastic part has two round ribs that are difficult to be formed, two inserts are add
正在加载中,请稍后...细心的小明同学注意到这样一个问题:如果打开窗户,直接看远处的高架电线,电线呈规则的下弯弧形;而如果隔着窗玻璃看,电线虽然整体上也呈弧形,但电线上的不同部位有明显的不规则弯曲,而且,轻微摆动头部让视线移动时,电线上的不规则弯曲情景也在移动.产生这种现象的原因是(  )
A 、玻璃上不同部位对视线的阻挡情况不同
B 、玻璃各部分的透光度不均匀
C 、玻璃各部分的厚度不均匀
D 、玻璃上不同部位对光的反射不一样
解:A、如果隔着窗玻璃看,玻璃上不同部位对光的折射程度不同,而不是玻璃上不同部位对视线的阻挡情况不同,故本选项错误;
B、因玻璃上不同部位透过光的颜色是相同的,都是透过白色光,故本选项错误;
C、因玻璃上不同部位因厚度不同对光的折射情况不同,所以如果隔着窗玻璃看,电线虽然整体上也呈弧形,但电线上的不同部位有明显的不规则弯曲,当轻微摆动头部让视线移动时,电线上的不规则弯曲情景也在移动.故本选项正确;
D、因如果隔着窗玻璃看,玻璃上不同部位对光的折射情况不同,而不是反射情况不同.
根据光的折射现象,从玻璃上不同部位因厚度不同对光的折射情况不同这一角度入手,然后再对各个选项逐一分析即可.

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