ComputerAided_Design_Engineering_amp_Manufactur.pdf
ComputerAided_Design_Engineering_amp_Manufactur.pdf
ComputerAided_Design_Engineering_amp_Manufactur.pdf
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In a strict theoretical perspective, a report generation module in a CAPP system should be capable of<br />
providing the process plans in one or all of the above formats. This becomes possible only when the<br />
basic process plan information is represented in a structured format. In this context, the role of PPIR<br />
and Report-GIFTS in the proposed system can be appreciated.<br />
It is to be noted that PPIR alone cannot provide all the details that should appear on the process<br />
planning sheets. This is because some fields in PPIR are pointed to other models of GIFTS. These pointers,<br />
adopted from the concept of relational data base managements systems (RDBMS), can be thought of as<br />
the mechanisms providing meaningful relationships among models. For ex<strong>amp</strong>le, using the machine<br />
code and tool code (which are stored in PPIR) as the pointers, the machine tool and cutting tool details<br />
can be obtained from the data bases (MRIR). Similarly, the part name, drawing number, batch size, etc.<br />
are available as global data in PDIR.<br />
In the current implementation of the system, several macros are developed in Report-GIFTS for<br />
automatic translation of PPIR details to predetermined textual formats. Once translated, these are stored<br />
in a text file. This file consists of the process planning details (description of setup, machine, and<br />
operations, tools to be used, and the process parameters) in a comprehensible form. This file can be<br />
retrieved into any word processor for editing the plan if desired and to take the printout of the process<br />
plan. Graphical simulation of the plans is also attempted by representing the tool shapes symbolically,<br />
the details of which can be found in the next chapter. The process (PPER) generated by Report-GIFTS<br />
for the ex<strong>amp</strong>le part shown in Figure 5.18 is given in Table 5.7.<br />
TABLE 5.7 Process Plan for the Part in Figure 5.18—PPER in Textual Format<br />
A. B. C. Ltd. Process plan for the part EX_GIFTS QTY:1<br />
No. Machine/Setup/Operation Tool<br />
Speed<br />
(m/min)<br />
Feed<br />
(mmpr)<br />
Doc<br />
(mm) NOP<br />
Time<br />
(min)<br />
1 4-A-23 reverse and hold in chuck<br />
Face TT49 198.00 0.16 6.50 1 0.790<br />
Rough turn dia 100.00 to 64.00 over a length of 75.00 TT49 170.79 0.21 6.00 3 3.700<br />
Rough turn dia 64.00 to 60.00 over a length of 73.00 TT49 258.52 0.52 2.00 1 0.610<br />
Rough turn dia 60.00 to 45.00 over a length of 35.00 TT49 161.98 0.17 7.50 1 0.740<br />
Chamfer dia 45.00 161.98 0.17 2.00 1 0.010<br />
Chamfer dia 60.00 161.98 0.17 2.00 1 0.010<br />
Cut groove of width 3 mm GR19 121.49 0.04 3.00 1 0.070<br />
Make fillet FIR2 121.49 0.02 2.00 1 0.190<br />
Knurl dia 45.00 KNS1 121.49 0.03 1.00 1 1.020<br />
2 4-A-23 reverse and hold in chuck<br />
Face to length TT49 162.00 0.21 6.50 1 0.760<br />
Rough turn dia 100.00 to 91.00 over a length of 112.00 TT49 161.32 0.33 4.50 1 1.150<br />
Rough turn dia 91.00 to 45.00 over a length of 76.00 TT49 162.63 0.24 5.75 4 4.300<br />
Rough turn dia 45.00 to 43.00 over a length of 74.50 TT49 211.86 0.52 1.00 1 0.600<br />
Rough turn dia 43.00 to 36.00 over a length of 45.00 TT49 187.13 0.38 3.50 1 0.580<br />
Finish turn dia 91.00 to 90.00 over a length of 36.00 TT47 429.18 0.35 0.50 1 0.580<br />
Finish turn dia 43.00 to 42.00 over a length of 29.50 TT47 202.43 0.24 0.50 1 0.580<br />
Chamfer dia 90.00 202.43 0.24 2.00 1 0.010<br />
Chamfer dia 42.00 202.43 0.24 2.00 1 0.010<br />
Chamfer dia 36.00 202.43 0.24 2.00 1 0.010<br />
Cut groove of width 3 mm GR19 101.21 0.12 3.00 1 0.020<br />
Make fillet FIR1.5 151.82 0.05 1.50 1 0.030<br />
Thread dia 36.00 TH84 40.72 2.50 0.48 10 1.000<br />
TH84: R166N-3232M-310 (Sandvik code); TT49: PDJNR2525M15 (insert: DNMG150608); GR19: Form grooving<br />
tool; TT47: PDJNR2525M15 (insert: DNMG150612); KNS1: Straight knurling tool with pitch 1 mm; FIR1.5: Filleting<br />
tool with radius 1.5 mm; FIR2: Filleting tool with radius 2 mm.