6) Shaping-Grinding-and-Realated-Operations - LECTURE-05 SHAPING RELATED OPERATIONS NIKHIL R DHAR Ph D DEPARTMENT OF INDUSTRIAL PRODUCTION ENGINEERING

6) Shaping-Grinding-and-Realated-Operations - LECTURE-05...

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LECTURE-05 SHAPING & RELATED OPERATIONS NIKHIL R. DHAR, Ph. D. DEPARTMENT OF INDUSTRIAL & PRODUCTION ENGINEERING BUET BANGLADESH
Department of Industrial & Production Engineering 26/2 Shaping and Planing Shaping and Planing among the oldest techniques Shaping is where the workpiece is fed at right angles to the cutting motion between successive strokes of the tool. Planing the workpiece is reciprocated and the tool is fed at right angles to the cutting motion. These process require skilled operators and for the most part have been replaced by other processes
Department of Industrial & Production Engineering 26/3 Classification of Shapers Horizontal -push cut Plain (Production work) Universal (Tool room work) Horizontal -draw cut Vertical Slotter Key seater Special purpose-as for gear cutting
Department of Industrial & Production Engineering 26/4 Horizontal Push Cut Shaper The shaper is a relatively simple machine. It is used fairly often in the toolroom or for machining one or two pieces for prototype work. Tooling is simple, and shapers do not always require operator attention while cutting. The horizontal shaper is the most common type, and its principal components are shown below, and described as follows:
Department of Industrial & Production Engineering 26/5 Ram : The ram slides back and forth in dovetail or square ways to transmit power to the cutter. The starting point and the length of the stroke can be adjusted. Toolhead : The toolhead is fastened to the ram on a circular plate so that it can be rotated for making angular cuts. The toolhead can also be moved up or down by its hand crank for precise depth adjustments.
Department of Industrial & Production Engineering 26/6 Clapper Box : The clapper box is needed because the cutter drags over the work on the return stroke. The clapper box is hinged so that the cutting too] will not dig in. Often this clapper box is automatically raised by mechanical, air, or hydraulic action. Table : The table is moved left and right, usually by hand, to position the work under the cutter when setting up. Then, either by hand or more often automatically, the table is moved sideways to feed the work under the cutter at the end or beginning of each stroke.
Department of Industrial & Production Engineering 26/7 Saddle : The saddle moves up and down (Y axis), usually manually, to set the rough position of the depth of cut. Final depth can be set by the hand crank on the tool head. Column : The column supports the ram and the rails for the saddle. The mechanism for moving the ram and table is housed inside the column.
Department of Industrial & Production Engineering 26/8 Tool holders : Tool holders are the same as the ones used on at engine lathe, though often larger in size. The cutter is sharperred with rake and clearance angles similar to lathe tools though the angles are smaller because the work surface is usually flat. These cutters are fastened into the tool holder. just as in

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