内燃机气门顶柱挤压模设计

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【摘要】内燃机是使用燃料直接在机械内部燃烧并借助工质（燃气）的状态变化实现做功的机械。当前工程机械用的动力装置有汽油机、柴油机、燃气轮机和柴油机等。电动机具有功率范围广、噪声小、无污染等优点，但是，其适用范围受到电源的限制，因此，常在很少移动或移动距离较短的挖掘机、起重机上。燃气轮机的特点是结构简单、尺寸小、重量轻、运转平稳等，其功率比汽油机和柴油机底，因而主要用于航空动力方面。汽油机与柴油机相比，由于升功率较高，噪声与振动较小，所以它多应用于国民经济的各个领域，并成为工程机械的主要动力。这里所讨论的是这种应用广泛的汽油机气门顶柱挤压模设计。在挤压工艺中我所讨论的是冷挤压加工。冷挤压加工是在模具的强大压力下，迫使大截面的毛坯从凹模孔或从凸模与凹模之间的间隙中挤出，从而获得小截面的挤压件。

【关键词】内燃机；冷挤压；凸模；凹模

Engine Valve top column extrusion die design
 [Abstract] Internal combustion engine is to use the fuel directly in the internal combustion machinery, and with working fluid (gas) is doing work to achieve the mechanical state changes. The current power plant construction machinery have gasoline engines, diesel engines, gas turbines and diesel engines. Has a wide range of motor power, noise, pollution, etc, but its scope limited by the power supply, therefore, often little move or move away from short excavator, crane. Gas turbine is characterized by simple structure, small size, light weight, smooth operation, with its power base than gasoline and diesel engines, which is mainly used for air force side. Compared to gasoline and diesel, rose as high power, low noise and vibration, so it is more used in various fields of national economy and become the main driver of construction machinery. Discussed here, this is the widely used gasoline engine valve top column extrusion die design. In the extrusion process is discussed in my cold extrusion. Extrusion is under strong pressure in the mold, forcing a large section of the blanks from the die hole or from the punch and the die gap between the extrusion, which was a small section of the extrusion.

[Key words]  Internal combustion engine ；Cold extrusion； Punch；Die

目  录
1 前言 1
2 选题背景 1
2.1 内燃机气门顶柱 1
2.2 挤压模选型 3
3 冷挤压前的准备 6
3.1 工艺分析 6
3.2 原材料的选择 7
3.3 毛坯的形状与尺寸 8
3.4 毛坯制备 8
3.5 冷挤压材料的软化处理 9
3.6 冷挤压毛坯的表面处理与润滑 9
4 冷挤压力的计算及挤压力机的选择 11
4.1 变形程度 11
4.2 计算挤压力 13
4.3 冷挤压设备的选择 16
5 冷挤压模具 18
5.1 冷挤压模具工作部分设计 18
5.2 导向装置 23
5.3 顶件装置 24
6 总结 24
参考文献 25
致   谢 26

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