外文翻譯---模具成型軋制(已改無錯字)
2022-09-06 06:54:32 本頁面
【正文】 e the stress is maximum). Large products and high strength materials can be worked upon under hot conditions since the elevated temperature lowers down the strength and, consequently, the work load. Moreover, for most materials, the ductility increases with temperature and, as a result, brittle can also be worked upon by the hot working operation. It should, however, be remembered that there are certain materials (viz., steels containing sulphur ) which bee more brittle at elevated temperatures. When a very accurate dimensional control is required, hot working is not advised because of shrinkage and loss of surface metal due to scaling. Moreover, surface finish is poor due to oxide formation and scaling. The major advantages of cold working are that it is economical, quicker, and easier to handle because here no extra arrangements for heating and handling are necessary. Further, the mechanical properties normally get improved during the process due to strain hardening. What is more, the control of grain flow directions adds to the strength characteristics of the product. However, apart from other limitations of cold working (viz., difficulty with high strength and brittle materials and large product sizes), the inability of the process to prevent the significant reduction brought about in corrosion resistance is an undesirable feature. 成形成形可以定義為一種通過材料的塑性變形獲得所需尺寸和形狀的工藝。在此工藝中引起的應(yīng)力大于材料的屈服強度，但小于材料的斷裂強度。加載的類
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