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广东工业大学 材料成型及控制工程 专业英语 复习版.doc

发布:2017-05-26约6.82千字共6页下载文档
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parting (line) plane分模面;draft拔模斜度;corner( fillet) radius外(内)圆角半径;web筋;rib肋;punchout连皮;roller impression 滚挤模膛;bar stock棒坯,棒料;gutter沟槽,仓部;gate钳口;flash飞边;knock-out pins顶杆;thermal fatigue 热疲劳;die wear模具磨损;heat checking热龟裂;steep temperature gradient温度梯度高;slider-crank mechanism 曲柄滑块机构;pinion shaft 小齿轮轴,驱动轴;press frame机身,机架;nominal load名义载荷,标称吨位;overload safety 过载保护;BDC------bottom dead center下止点;upright 立柱;blank holder slide压边滑块;close-tolerance小公差;wire drawing 线材拉拔,拉丝;close-die presses 模锻压力机;vertical presses立式机身压力机;relief valve安全阀;reservoir充液罐,油箱;accumulator 蓄能器;residual pressure背压;emulsion 乳化液;foot treadle脚踏板;idle swings悬空摆动; 1. The dies for use on presses are often designed to forge the part in one blow, and knock-out pins are often incorporated to mechanically eject the forging from the impression. 用于热模锻压力机的锻模常设计成一火锻造,为从模膛中顶出锻件常需安装顶杆。 2. Since mechanical presses operate with a fixed, the dies used on these presses are designed so that die filling occurs without the two die halves making contact. 由于机械压力机以固定行程运行,压力机上的模具设计成填充模具时两哈夫块不接触。 3. The dies are subjected to alternating stresses due to loading and unloading during the deformation process, and this causes crack initiation and eventual failure. 模具正是由于承受变形过程中加载和卸载的交变应力而产生裂纹直至最终失效。 4. In this study, the yield strength value and the hardness value of 5 kinds of materials were measured. and the result was compared with the theoretical values; the hardness value is 3 times that of the yield strength.。本研究测定了5种材料的屈服强度和硬度,进行了实验结果与理论值的对比,硬度约为屈服强度的3倍。 电火花加工示意图如图3-17所示。模块放在装有电火花加工液的容器里,加工液通常用的是煤油。具有一定形状的金属或石墨电极通过伺服控制朝下缓缓向模块移动。模块和电极都接通电源就会有电压,当电极和模块之间的间隙足够小时,电压会产生电火花击穿这个间隙。电火花频率为200~500,000赫兹,电极和模块上的部分材料会被电火花熔化。在理想条件下,模块与电极的损耗比如下:金属电极为3:1,石墨电极为100:1。从模块上去除的金属屑被循环流动的电解液冲走。因此,模具材料被电火花腐蚀后,在模块中形成了电极的空间形状。 钢带模冲裁是将钢带安装在硬木上作为模具的工艺。钢带冲模与甜饼切刀相似,这种工艺省去了用作落料的刚性凹模。钢带制成有待成形零件的外形,并镶在硬木板或专用的层压板上。钢带及其剪切运动如图14-32所示。冲头可用1045钢,并经火焰淬火后精磨。 用于钢带模的钢条厚度在1.4~4.22毫米范围,且剪切刃口磨成45(的斜角。钢带模适用于精度要求不高、厚度达10毫米的铝板或1.5毫米的钢板的小批量冲压生产。 机械压力机效力高,适合自动化生产。大部分机械压力机(包括曲柄
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