T
2 3
1
he machinability of a casting is infl uenced by the metal. Metallurgists and quality assurance managers wish to use machinability testing methodology to measure and record the eff ect of alloy type, metal al- loy grade, composition, microstructure, mechanical properties and/or physical properties on enhancing machinability. Michael Finn, Finn Metalwork- ing and Cutting Solutions, with support from the American Foundry Society (AFS), developed a manual for using factorial designed experiments to reduce the number of metalcasting experimental
ADDING IT ALL UP
“User’s Manual on a Machinability Testing Methodology for Cast Iron,” Michael Finn, Finn Metalworking and Cutting Solutions, Loveland, Ohio. Background—The new manual for testing the machinability of cast metals contains recommended procedures designed to test gray and ductile cast iron.
Procedure—Multiple test campaigns at different cutting speeds are conducted, during which the time to take one pass, along with the fl ank wear width of the wear land, is measured and recorded. Results and Conclusions—A graph of the results plotted on a graph with a Taylor Line is used to compare the different heat lots and grades of cast iron for machinability. The test has been verifi ed at multiple machining locations.
runs and identify the processing condi- tions aff ecting the machinability values. T e user’s manual for testing the
machinability of cast metals, now avail- able from AFS and written by Finn, contains recommended procedures designed for testing gray and ductile iron castings and may be adapted to machinability testing of other cast metals. It includes recommended parameters for: • Workpiece shape and size • Machine and cutting tools • Cutting fl uid • Machining parameters and data measurements
• Data recording and analysis • Presentation of the results. The testing methodology mea-
sures machinability value relative to a casting’s performance in machin- ing, reducing the amount of time and money spent on chemical, tensile and microstructure rechecks of the castings. The methodology also can help predict machinability values for components produced in a specific cast alloy.
Mar/Apr 2013 | METAL CASTING DESIGN & PURCHASING | 33
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