[电子教案]模具技术专业英语 (15)

模具技术专业英语
15.2 Reading Material
15.2.1 Manufacturing Accuracy
Manufacturing can be defined as the transformation of raw materials into useful products through the use of the easiest and least-expensive methods. It is not enough, therefore, to process some raw materials and obtain the desired product. It is, in fact, of major importance to achieve that goal through employing the easiest, fastest, and most efficient methods. If less efficient techniques are used, the production cost of the manufactured part will be high, and the part will not be as competitive as similar parts produced by other manufacturers. Also, the production time should be as short as possible to enable capturing a larger market share.
模具技术专业英语
电子工业出版社
Unit 15 The Process of Mold Assembly
Pre-reading
Read the following passages and pay attention to these questions. 1) Which components are a die made up of? 2) How does a press die assemble？ 3) How does a plastic mold assemble? 4) Which factors should be considered when selecting fasteners for aຫໍສະໝຸດ given application?
模具技术专业英语
15.1 Text
Components and assembly The die in Fig. has several piercing punches with the last punch being the blanking station.
模具技术专业英语
15.1 Text
模具技术专业英语
15.1 Text
15.1.1 The Process of Press die assembly
Tolerance systems Manufacturing of parts cannot be absolutely precise. If such be the case, the cost of components would be horrendous. Different manufacturing fields use a different tolerance ranges. Where ±0.031 in. (0.79 mm) can be unacceptable in die work, the same tolerance range is too tight for, let us say, in steel constructions.
Mounting the dies Machining of blocks Mounting hardware Jigs and fixtures
模具技术专业英语
15.1 Text
15.1.2 The Process of Plastic Mold Assembly
Stage 1 Finishing the impression Stage 2 Aligning cavity and core Stage 3 Bedding down Stage 4 Water cooling circuit Stage 5 Fitting ejector system Stage 6 Fitting sprue bush and register ring Stage 7 Polishing, hardening and try-out
There are thee main classifications of fasteners, which are described as follows. • Removable. This type permits the parts to be readily disconnected without damaging the fastener. An example is the ordinary nut-and-bolt fastener. • Semipermanent. For this type, the parts can be disconnected, but some damage usually occurs to the fastener. One such example is a cotter pin.
模具技术专业英语
15.2 Reading Material
15.2.2 Fasteners
The principal purposes of fasteners are to provide the following design features.
• Disassembly for inspection and repair. • Modular design where a product consists of a number of subassemblies. Modular design aids manufacturing as well as transportation.