Mechanical tools

.The different manufacturing processes of steel . manufacturing process of steel by the bessemer process . distinguish between acid process and basic process Manufacturing processes The different manufacturing processes of steel -Bessemer process -L. D process -Electric process -Open hearth process Bessemer process Sir Henry Bessemer, a British engineer invented this process of converting molten pig-iron to steel  using a large pear shaped container. This is called the Bessemer converter. It is a method of producing steel by blasting compressed air through molten iron and burning out the excess carbon and other impurities. This does not use any source of heat other than obtained from the oxidising process used to remove carbon and other impurities. The three stages of this process are -the preliminary stage (The slag formation ) -the boil stage (The brilliant flame blowing period) -the finishing stage (The reddish smoke period ) The molten pig iare from the blast furnace is poured ...

  VEE THREADS . types of 'vee' threads used for thread fastening . distinguish the features of different 'vee' thread forms . designate different types of 'vee ' threads Types of 'vee' Threads 'Vee' threads are available in different forms and standards. The type of ' vee' threads used for general engineering threaded fasteners are ISO metric thread ISO inch(unified thread) British standard whitworth thread British standard fine thread. ISO metric thread This is the form of thread approved by B.I.S. for threaded fastening. Two series of threads have been identified by them. They are ISO meric-coarse ISO metric-fine. The thread angle is 60°.the root of the external thread is rounded. The crest of the external thread is flat, but sometimes it is rounded depending on the type of the manufacturing process. The root of the internal thread is cleared beyond the width equal to one eighth of the pitch and is rounded. The Crest of the internal thr...