制造工程與技術(shù)（上下冊）

內(nèi)容概要

時代教育·高校雙語優(yōu)秀教材。

作者簡介

作者：(美國)S.卡爾帕基安(Serope Kalpakjian) (美國)S.R.施密德(Steven R.Schmid)

書籍目錄

上冊：制造工程與技術(shù)(熱加工)(英文版)下冊：制造工程與技術(shù)(熱加工)學(xué)習(xí)輔導(dǎo)/全燕鳴主編

章節(jié)摘錄

版權(quán)頁：   插圖：   14.7 DIE MATERIALS AND LUBRICATION Among important aspects of forging （as well as of other manufacturing processes discussed in Part Ⅲ） are die materials and lubrication. Die Materials.Most forging operations, particularly forlarge parts, are carried out at elevated temperatures. General requirements for die materials therefore are （a） strength and toughness at elevated temperatures, （b） hardenability and ability to harden uniformly, （c） resistance to mechanical and thermal shock, and （d） wear resistance, particularly resistanceto abrasive wear, because of the presence of scale in hot forging. Selection of proper die materials depends on such factors as the die size, the composition and the properties of the workpiece, the complexity of the shape, the forging temperature, the type of forging operation, the cost of the die materials, and the number of forgings required. Heat transfer from the hot workpiece to the dies （and subsequent distortion of the dies） is also an important factor. Common die materials are tool and die steels containing chromium, nickel, molybdenum, and vanadium （see Tables 5.5 and 5.6）. Dies are made from die blocks, which themselves are forged from castings and then machined and finished to the desired shape and surface finish. Die failures usually result from a variety of the reasons described in Section 14.10. Die manufacturing methods are also described in that section. Lubrication.Lubricants greatly influence friction and wear; consequently, they affect the forces required （Eq.14.1） and the flow of the metal in die cavities. They can also act as a thermal barrier between the hot workpiece and the relatively cool dies, slowing the rate of cooling of the workpiece and improving metal flow. Another important role of the lubricant is to serve as a parting agent, that is, one which inhibits the forging from sticking to the dies and helps in its release from the die. A wide variety of lubricants can be used in forging. （See also Chapter 32.） For hot forging,graphite, molybdenum disulfide, and sometimes glass are used. For cold forging, mineral oils and soaps are common lubricants, applied after conversion coating of the blanks （Section 32.12）. In hot forging, the lubricant is usually applied directly to the dies; in cold forging, it is applied to the workpiece. The method of application and the uniformity of the lubricant's thickness on the blank are important to product quality.

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《時代教育?高校雙語優(yōu)秀教材:制造工程與技術(shù)(熱加工)及學(xué)習(xí)輔導(dǎo)(英文版)(套裝共2冊)》敘述嚴(yán)謹(jǐn)、邏輯清晰、內(nèi)容適度易懂，具有很高的實用價值?？勺鳛闄C(jī)械工程類的本、?？茖W(xué)生學(xué)習(xí)英文原版教材的輔導(dǎo)，也可隨原版教材一起作為工程技術(shù)人員的參考資料及涉外企業(yè)員工的培訓(xùn)教材。

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