新型铣削测温系统设计+CAD图纸+答辩PPT
时间:2017-06-27 19:22 来源:毕业论文 作者:毕业论文 点击:次
| 摘要：铣削是切削加工中应用最广泛的一种断续切削方式。目前，铣刀刀片的材料主 要采用硬质合金、金属陶瓷等脆性材料。这类材料硬度高但韧性较差，在断续切削 过程时易造成刀具破损。其原因是切削温度直接影响刀具体内的热应力分布，尤其 在铣削过程中，刀片频繁切入切出，刀具受到周期性的热冲击，易使硬质合金刀片 产生热裂纹而导致破损。因此测量出铣削温度，并以此为基础对铣刀片的温度场以 及受热密度函数特别是表面受热密度函数进行研究，为铣刀刀片的破损原因及槽型 优选提供关键数据和依据。铣削是指使用旋转的多刃刀具切削工件，是高效率的加工方法。工作时刀具旋转（作主运动），工件移动（作进给运动），工件也可以固定，但此时旋转的刀具还必须移动（同时完成主运动和进给运动）。铣削用的机床有卧式铣床或立式铣床，也有大型的龙门铣床。这些机床可以是普通机床，也可以是数控机床。铣削的特征是：①铣刀各刀齿周期性地参与间断切削；②每个刀齿在切削过程中的切削厚度是变化的。③每齿进给量αf（毫米/齿）,表示铣刀每转过一个刀齿的时间内工件的相对位移量。10792 关键词：铣削；铣刀；测温；特征 Thermocouple basic principle and method of use Abstract：Commonly used thermocouple indexing, S, B, E, T, K, J, etc., these are all standard thermocouples. Which type K means nickel chrome - nickel and silicon thermocouple, it is a cheap thermocouple to measure high temperature. Because of this alloy has good high temperature oxidation resistance, may apply in oxidizing or neutral medium. It can measure 1000 - degree heat for a long time, short-term measurable to 1200 degrees. It cannot be used for reducing medium, otherwise, the decay quickly, in this case can only be used for measuring under 500 degrees. It is much cheaper than S type thermocouple, the repeatability is good, the thermoelectric potential is large, and thus the sensitivity is very high, and it has a good linear. Although its measuring precision degree is slightly lower, but can entirely meet the requirements of industrial temperature measurement, so it is the most commonly used thermocouple on industry. Summary: as the industrial temperature measurement, one of the most widely used temperature sensor of thermocouple, and the platinum thermal resistance, together accounting for about 60% of the total temperature sensor, thermocouple and display instrument, usually measured directly in the production of various - 40 ~ 1800 ℃ range of liquid, vapour and gas medium, as well as the surface temperature of the solid. Thermocouple principle: two different components of the conductor (called the thermocouple wire or hot electrode) synthesis loop at both ends, when the junction temperature is not at the same time, in the circuit will generate electromotive force, this kind of phenomenon called the thermoelectric effect, called the thermoelectric potential and the electric potential. 目录 摘要 3 1课题背景 6 2测量方法的研究 6 2.1 热电偶法 6 2.1.1 自然热电偶法 7 2.1.2人工热电偶法 8 2.1.3半人工热电偶法 9 2.2热辐射测温法 11 2.3红外照相法 11 3铣削温度测量方法选择 12 4.温度检测系统的构成 12 4.1 铣削温度试验系统软硬件配备 13 4.2铣刀片测温孔的获得 13 4.3温度传感器的组装 13 4.4 铣削温度试验 14 4.5 补偿导线 15 4.6电压信号放大器 16 4.7 软件设计 18 (责任编辑：qin) |