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  3.2 &3.3 Housing and baseframe Different components being manufactured can’t work freely in air , will need some outer cover where in planned spaces the gear, pinion shafts , shaft , bearings will be placed perfectly. This cover is generally fabricated in fabrication shop in two or three parts. - Housing is the upper part of the cover (it may be divided into two parts upper and lower housing) - Baseframe is lower part of the cover which remains on the ground and gets joint to housing. Different steps followed - At first the process starts at fabrication shop where bigger sheets of metal of desired thickness gets cut through cnc laser cutter or manual laser cutter machines. Flame used in the process is mainly lpg- oxygen flame or plasma flame. - After marking on the sheet and cutting through the flame the small sheet parts are sent for welding where the welder joins the pieces according to the given drawing. Mostly MIG welding is used over arc welding because of more strength, no gap, no flux formation. -Before the welding process the pieces of sheets gets grinded according to requirement . After the welding too grinding can be done if required. - Now the housings and baseframes are sent to stress relieving furnace where it is heated upto desired temperature to remove the internal stresses generated during the fabrication process. Stress relieving Stress Relieving is a heat treating process that consists of heating the steel to a temperature below the critical range to relieve the residual stresses resulting from hot rolling, welding shearing, or gas cutting. Stress relieving does not change the material properties as does annealing and normalizing. Since the critical temperture remains around 900 to 950 °c ,the stress relieving is done at around 600 °c.   Stress relieving furnace Stress Relief Furnaces  relieve stresses in materials generated by welding, machining, or heat processing.  The purpose of a Stress Relief Furnace is to raise the temperature of a component to slightly below the transformation temperature. This elevation in temperature eliminates internal stresses caused by secondary processes such as welding, machining, or cold forming. Upon reaching completion of the heat-up and hold cycle, the parts are then cooled at a controlled rate. Stress relieving furnace - After stress relieving the housing and base frame are sent to shot blasting  unit where through steel ball shots the cleaning , deburring of the housing surface. - Shot blasting  Shot blasting is a method used to clean, strengthen (peen) or polish metal. Shot blasting is used in almost every industry that uses metal, including aerospace, automotive, construction, foundry, shipbuilding, rail, and many others. There are two technologies used: wheelblasting or airblasting .  Airblast machines can take the form of a blast cabinet ,the blast media is pneumatically accelerated by compressed air and projected by nozzles onto the component. For special applications a media-water mix can be used, this is called wet blasting. In both air and wet blasting the blast nozzles can be installed in fixed positions or can be operated manually or by automatic nozzle manipulators or robots.  The blasting task determines the choice of the abrasive media,in our case the abrasive material was steel balls. Steel balls shooting the parts - after this step the warnish is applied on the surface of the parts and sent for machining. Machining Machining  is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing.  Different processes of machining Boring  - In machining, boring is the process of enlarging a hole that has already been drilled(or cast) by means of a single- point cutting tool (or of a boring head containing several such tools), such as in boring a gun barrelor an engine cylinder. Boring is used to achieve greater accuracy of the diameter of a hole, and can be used to cut a tapered hole. Turning- Turning operations are operations that rotate the workpiece as the primary method of moving metal against the cutting tool. Lathes are the principal machine tool used in turning Milling- Milling operations are operations in which the cutting tool rotates to bring cutting edges to bear against the workpiece. Milling machines are the principal machine tool used in milling.    Drilling - Drilling operations are operations in which holes are produced or refined by bringing a rotating cutter with cutting edges at the lower extremity into contact with the workpiece. Drilling operations are done primarily in drill presses but sometimes on lathes or mill. Shaping or planing- Planing  is a manufacturing process of material removal in which the workpiece reciprocates against a stationary cutting tool producing a plane or sculpted surface. Planing is analogous to shaping. The main difference between these two processes is that in shaping the tool reciprocates across the stationary workpiece. Planing motion is the opposite of shaping. Both planing and shaping are rapidly being replaced by milling.
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