机电工程专业英语 教学课件 ppt 作者 马佐贤 主编 张雪娟 副主编Unit11.pptVIP

* * * Unit 11 Mold Technology Dialogue 11.1 Mold Technology 11.2 Dialogue 11.1 Miss Li Tom What is NC? Do you know about the kinds of steels? carbon steel alloy steel gears, bearings, springs wires nickel chromium alloy steel bolts, tools working parts of machines iron carbon carbon steel Usage Elements Name Mold Technology 11.2 What are the main plastic mold materials in mold manufacturing? machine tool 机床 paper match plaster metal 纸梗火柴 塑料 金属 It is interesting in this regard that，in many cases， the selection of the mold material is not only a question of material properties and an optimum price-to-performance ratio but also that the methods used to produce the mold， and thus the entire design can be influenced. 在许多情况下，选择哪种模具材料不仅要考虑材料的特性和最佳的性价比，还要考虑模具的制造方法，因为他们影响整体设计。 A typical example can be seen in the choice between cast metal molds，with their very different cooling systems， compared to machined molds．In addition，the production technique can also have an effect；for instance，it is often reported that，for the sake of simplicity，a prototype mold is frequently machined from solid stock with the aid of the latest technology such as computer-aided design (CAD) and computer-integrated manufacturing (CIM)． 一个典型的例子，铸造金属模和机械模的冷却系统区别很大，另外生产技术也有影响：例如，经常报道，为简单起见，固态胚料常用像计算机辅助设计和计算机一体化制造这样的必威体育精装版技术制造成原型模具。 In contrast to the previously used methods based on the use of patterns，the use of CAD and CIM often represents the more economical solution today，not only because this production capability is available in-house but also because with any other technique an order would have to be placed with an outside supplier. 与以前制造模型的方法相比，CAD和CAM的应用代表了当今更为经济的制造方法，不仅因为内部生产能力可以利用，而且因为若采用其他工艺技术，定单必然会落入厂外供应商手里。 Overall，although high-grade materials are often used，as a rule，standard materials are used in mold making．New，high-performance materials，such as ceramics，for instance，are almost completely absent．This may be related to the fact th