freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

機(jī)械專業(yè)畢業(yè)設(shè)計(jì)--外文資料和翻譯-其他專業(yè)-文庫(kù)吧資料

2025-01-27 12:28本頁(yè)面
  

【正文】 e of workpiece surface of workpiece surface quality, scratch, leads to poor cutting processing. For this kind of steel, annealing may not be the most appropriate treatment. Many of the most high and cutting steel processing usually can be greatly improved by annealing except in the soft, because of their condition, high hardness and strength for processing. And the annealing method is GongXi just slow to the steel wire, insulation above about for a period of time, make the same temperature uniformity, forming materials, then the austenitic or buried with furnace lime or other insulating materials in slow cooling. To precipitation of ferrite and pearlite bulky iron, steel in the soft, the strain of toughness and minimum, must slow cooling. Second, normalizing How much is the fire of similar purposes, but not the annealing steel soft and fine pearlite state. Not bulky. Steel is refined grains, fire can release of stress, improve structural homogeneity and restore some plastic, high toughness. This method is often used to improve cutting machining, reduce stress, reduce part machining or limitation of deformation. Is the fire will chromatography method is GuoGongXiGang steel or slow heated 畢業(yè)設(shè)計(jì)說(shuō)明書(shū) 28 to Ac3 respectively, Accm line or online insulation for a period of time to form, and in the austenitic stationary air slow cooling. Should notice more, GongXi position of carbon steel needs to be heated to Accm line above, not Ac1 line above the annealing. The purpose is in the process of austenitic to dissolve all cementite, thus to minimize the boundaries on hard and brittle iron carbon pounds, and get little grain of ferrite pearlite, minimum free cementite and freedom. Third, the ball annealing Through the steel ball annealing can get minimum hardness and the biggest plastic, it can make the iron carbon pounds with small globular distribution in ferritic matrix. In order to make the ball easier small particles, usually for fire steel ball a
點(diǎn)擊復(fù)制文檔內(nèi)容
研究報(bào)告相關(guān)推薦
文庫(kù)吧 www.dybbs8.com
備案圖鄂ICP備17016276號(hào)-1