Title ：Magnetic motor shell stamping process and die design Author：yu

Department of Materials

"Magnetic motor shell stamping process and die design" literature review Abstract摘要

By read these references and documents, in-depth understanding of the contemporary mold of advanced manufacturing technology and metal forming technology, a number of instances of mold design and the understanding and learning, to further study the method of stamping die design, die design and thus have a directionalguidance.As used in this design and drawing die punching die and so on, through the design of the book related to mold in-depth study, this drawing die and the punching die and so the design methods have shape.These references and documents, the design of low-cost high-accuracy die with directional guidance. Keywords： Mold advanced manufacturing technology Mold Manufacturing Trends Drawing Punching CAE Die Materials Prices

Preface前言

As China's economic integration with the world economy, the rapid development of basic industries, mold manufacturing industry is also developing fast.In the current economic situation, people pay more attention to efficiency, product quality, cost, and new product development capabilities.The innovation and development of mold manufacturing concern.

1.1 The history of the development of mold

Archaeological discoveries in China, as early as 2,000 years ago, China has been used to make bronze stamping dies to prove that in ancient China stamping die stamping and achievements to the world's leading.In 1953, the Changchun First Automobile Works in China for the first time established a stamping plants, the plant began manufacturing cars in 1958, cover mold.60 years of the 20th century began producing fine blanking dies.In walked a long path of development temperature, the present, China has formed more than 300 billion yuan (not including Hong Kong, Macao and Taiwan statistics) the production capacity of various types of stamping dies.

1.2 Development Status and Trends Die

Since reform and opening, with the rapid development of the national economy, the market demand of mold growing.In recent years, the mold industry has been the growth rate of about 15% of the rapid development of industrial enterprises in the ownership of the mold components also changed dramatically, in addition to professional mold factory outside of state-owned, collective, joint ventures, wholly-owned and private has been a rapid development.

As with the accelerating pace of international standards, increasing competition in the market, it has been increasingly recognized product quality, cost, and new product development capacities.Many enterprises have increased in recent years, the mold for investment in technological progress, technological progress will be seen as an important driving force for enterprise development.Some domestic enterprises have popularized the two-dimensional mold CAD, and are starting to use UG, Pro / Engineer, I-DEAS, Euclid-IS and other international common software, individual manufacturers have also introduced Moldflow, C-Flow, DYNAFORM, Optris and MAGMASOFT etc.CAE software, and successfully applied to stamping die design.

1.2.2 trend

(1) a comprehensive promotion of CAD / CAM / CAE technology die CAD / CAM / CAE technology is the development direction of mold design and manufacturing

(2) high-speed milling process of foreign high-speed milling process developed in recent years, significantly improve the processing efficiency, and to get a high surface finish.

(3) die scanning and digitizing system and mold high-speed scanner provides scanning system to scan from a model or physical model of processing required for the desired number of functions, greatly reducing the manufacturing cycle in the development of mold.

(4) milling EDM EDM EDM Milling Technology, also known as invasive as processing technology, which is an alternative to the traditional processing of the cavity by forming a new electrode technology

(5) to improve the die mold standardization of standardization is increasing, estimates that the current use of standard mold coverage has reached about 30%.Developed countries is generally about 80%.

(6) high-quality materials and advanced surface treatment technology and application of high quality steel, the corresponding surface treatment technology to improve the life of the mold it is very necessary. New Technology Application in the metal forming

2.1 New Technology mold stamping application

Die mold manufacturing technology modernization is the basis for industrial development.With the development of science and technology, computer technology, information technology, automation technology and other advanced technologies are continuing to penetrate the traditional manufacturing technology, cross, integration, implementation of its transformation, the formation of advanced manufacturing technologies.

Today, CNC wire cut has a very high level of technological development, function quite well, the degree of automation has reached the degree of unattended operation.Developed by Japan Sodick Corporation A500W-E Sodick EDM wire EDM cutting speed has reached the maximum 300mm/min, machining precision can reach ± 1.5μm, surface roughness Ra0.1 ~

0.2μm.0.03 ~ 0.1mm in diameter fine thread cutting technology development, can be cut to achieve a complete convex mold, and the radius of 0.04mm and 0.02mm narrow groove cutting fillets.Taper cutting technology has been able to taper to 30 ° above the precision machining.

The application of advanced manufacturing technology, the mold has changed the traditional tooling mold quality depends on human factors and difficult to control the situation, making the mold quality depends on the physical and chemical factors, the overall level of easy to control, mold reproduction ability.

Summar结论y

After the analysis of the parts and see the large amount of data, and finally select the desired mold, mold design be simple, economical, practical, difficult to produce low, high efficiency, where workers learn a lot of mold research.See the development of domestic mold industry, the rapid development of China's mold industry rejoiced, but to see the advanced molding process with a huge gap, as a material people also feel a long way.The rapid development of today's industry, mold development of new technologies with the invention of new technology constantly updated, constantly changing.This requires that we always pay attention to the mold industry, and even the industrial development process.

 

第二篇：Context英文版的文献综述

Context---- a basic concept in the study of pragmatics. It is generally considered as constituted knowledge shared by the speaker and the hearer

Pragmatics-----the study of language in use or language communication; the study of the use of context to make inference about meaning；the study of how speakers of a language use sentences to effect successful communication . The study of the intended meaning of a speaker (taking context into consideration),

Sentence meaning: Abstract and context-independent meaning; literal meaning of a sentence; Utterance meaning: concrete and context-dependent meaning; intended meaning of a speaker

Speech act theory: analyzes the role of utterances in relation to the behavior of the speaker and the hearer in interpersonal communication.

Cooperative principle (CP) ---- Make your conversational contribution such as required at the stage at which it occurs by the accepted purpose or direction of the talk exchange in which you are engaged

Register, in a restricted sense, refers to the variety of language related to one’s occupation 201

Dialect: a variety of a language used recognizably in a specific region or by a specific social class: regional dialect, sociolects, idiolect, ethnic dialect-198

Language acquisition----refers to the child’s acquisition of his mother tongue, i.e. how the child comes to understand and speak the language of his community.

Error analysis: study and analysis of the errors made by second and foreign language learners 275 Interlangauge: learners’ independent system of the second language which is of neither the native language nor the second language, but a continuum or approximation from his native language to the target language.

Language aptitude refers to a natural ability for learning a second language. It is believed to be related to a learner’s general intelligence 277

Learning strategies are learners’ conscious, goal-oriented and problem-solving based efforts to achieve learning efficiency.

Second language: it plays an institutional and social role in the community; it functions as a recognized way of communication among members who speak some other language as their mother tongue, 273

Presequence：the opening sequences that are used to set up some specific potential action .186 Code-switching: bilinguals often switch between their two languages or language varieties in the middle of a conversation 206

Language planning: people examine all the languages and dialects in the country and decide which is the standard, official language or languages and specify their scope of use, and also make plans for the regional use and/or development of other languages and dialects.203

Adjacency pairs: a sequence of two related utterances by two different speakers. 183

Cohesion: refers to the grammatical and /or lexical relationships between the different elements of a discourse. 175

Topic: what the utterance is about； comment: what is said about it. 170