Advanced Manufacturing Processes (ME F315) PDF

Advanced manufacturing processes (ME F315) Department of Mechanical Engineering BITS Pilani K. K. Birla Goa campus Instructor in charge: Dr. Biswajit Das Office No.- E107 Tel: +91-832-2580381 (O) BI...

Advanced manufacturing processes (ME F315) Department of Mechanical Engineering BITS Pilani K. K. Birla Goa campus Instructor in charge: Dr. Biswajit Das Office No.- E107 Tel: +91-832-2580381 (O) BITS Pilani K. K. Birla Goa campus Dr. Manoj Kumar Pandey  G72-Canned cycle for facing in lathe G72 cycle is used for facing Block Parameter Description in a CNC lathe. First block W Depth of cut Programming syntax R Return value after G72 W….R… a cut is complete G72 P…Q…U….W…F…S Second block P Contour start block number Q Contour end block number U Finishing allowances in X- axis W Finishing allowances in Z- axis F Feed rate S Spindle speed  G73-Pattern repeating cycle in lathe Block Parameter Description G73 cycle is used for pattern repeating in a CNC First block U Amount of material lathe. will have to be cut in x-axis Programming syntax W Amount of material will have to be cut in G73 U….W…R z-axis G73 P…Q…U….W….F R No. of times cut will be repeated Second block P Start sequence No. Q End sequence No. U Finishing allowances in X-axis R=U or W/Maximum depth of cut +1 W Finishing allowances in Z-axis F Cutting Feed rate during G73 cycle G73-Pattern repeating cycle in lathe Thank you for your patience 5  Advanced manufacturing processes (ME F315) Department of Mechanical Engineering BITS Pilani K. K. Birla Goa campus Instructor in charge: Dr. Biswajit Das Office No.- E107 Tel: +91-832-2580381 (O) BITS Pilani K. K. Birla Goa campus Dr. Manoj Kumar Pandey  What is Grooving? Grooving or recessing is a material removal technique to produce narrow channel in the required place of the workpiece.  Grooving tools The shape of the groove depends on shape of grooving tool. Groove is produced either generating entire groove in a single plunge or a with a series of pulnges.  G75-Canned cycle for grooving operation in lathe G75 cycle is used for grooving cycle in a CNC Block Parameter Description lathe. First block R Retraction amount Programming syntax Second block X Groove Depth G75 R G75 X…Z…P…Q….F Z Last groove position in z-axis or last cutting point in groove face P Depth of cut in X- axis Q Depth of cut in z axis F Feed rate G75 – part programming for N10 G21 G90; grooving cycle N20 G98; N30 M06 T0303; N40 G97 S 800 M03; N50 G00 X42 Z2 M08; N60 G00 Z-19; N70 G75 R1; N80 G75 X 35 Z -23 P 1000 Q 4000 F 0.1; N90 G28; N100 M05; N110 M09; N120 M30;  G74-Canned cycles for in lathe G74 cycle is used for peck Block Parameter Description drilling in CNC lathe. First block R Retraction amount Programming syntax G74 R Second block Z Depth of the drilled hole G74 Z…Q….F Q Depth of cut in micron F Feed rate Thank you for your patience 7  Advanced manufacturing processes (ME F315) Department of Mechanical Engineering BITS Pilani K. K. Birla Goa campus Instructor in charge: Dr. Biswajit Das Office No.- E107 Tel: +91-832-2580381 (O) BITS Pilani K. K. Birla Goa campus Dr. Manoj Kumar Pandey Common operations performed in milling machine Specification of Milling machine (knee type and with arbour) Type; ordinary or swiveling bed type Size of the work table Range of travels of the table in X-Y-Z directions Arbour size (diameter) Power of the main drive Range of spindle speed Range of table feeds in X-Y-Z directions Floor space occupied. 2  Milling Operations Two main types: Planer Milling Contour Milling ❑ Planer Milling: Operation involves point to point and straight cut motions. Point to point examples: Drilling, boring, counter boring, counter sinking, reaming and tapping. Straight cut motion examples: End milling, Face milling, Plain milling and Chamfer. ❑ Contour Milling: Involves profile milling of cavities  Up and Down Milling Up Milling – Conventional milling Down Milling – Climb milling  Milling – Axes of motion The coordinate system used for the tool path must be identical to the coordinate system used by the CNC machine. Right hand rule Vertical milling machine CNC milling machines can perform simultaneous linear motion along the three axis and are called three-axes machines. CS: Axes on a CNC Milling  Standard CS In real situation, either the tool moves relative to the workpiece or the workpiece moves relative to the tool. But, in CNC programming, it is always assumed that the tool moves relative to the workpiece.  Standard CS For example, increasing +X coordinate values move the tool right in relation to the table, though the table actually moves left. Likewise, increasing the +Y coordinate values move the tool towards the back of the machine, but the table moves towards the operator. Increasing +Z commands move the tool up and away from the table.  Fixed Zero vs Floating Zero ❑ Fixed Zero: Origin is always located at some position on machine table. Usually at the south west corner or lower left hand corner of the table and all tool location are defined with respect to this zero. ❑ Floating zero: The point is selected by CNC programmer on the part, stock or fixture. The coordinate system is known as work coordinate system (WCS). WCS-Work coordinate system List of Some G-codes List of Some M-codes Radius Compensation  Cutter Offset Cutter path must be offset from actual part outline by a distance equal to the cutter radius Example 1: Example 1: Thank you for your patience 17