buildup. Unusual wear is noted and/or macrophotographed for further explana- tion. T e cutting tool life is calculated by multiplying the number of passes by the time to complete a pass. T e time taken to reach the fl ank wear end of life criterion, cutting tool life, is recorded in
minutes on the test report sheet. T e procedure is repeated with the other selected speeds. Finn recommends a minimum of fi ve test campaigns that include: • Two test runs at the low cutting speed • One test run at the medium
cutting speed
• Two test runs at the high cut- ting speed.
More test campaigns with the
repetitions or other cutting speeds within the selected range will improve the test’s accuracy.
Fig. 2. Shown is a cast iron disc with uncut metal at the center after several test passes.
Fig. 3. The Taylor Line for cutting tool life can be used to compare different heat lots and cast iron grades.
36 | METAL CASTING DESIGN & PURCHASING | Mar/Apr 2013
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60