By Mabel Sykes, H E. 1861-1937 Slaught, N J. 1874- Lennes
Initially released in 1912. This quantity from the Cornell collage Library's print collections used to be scanned on an APT BookScan and switched over to JPG 2000 layout by means of Kirtas applied sciences. All titles scanned conceal to hide and pages might contain marks notations and different marginalia found in the unique quantity.
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A possible limitation to the use of castings is the time required between starting to make the patterns and receiving castings from the foundry. Production scheduling may not allow time for this delay; and weldments are often substituted for castings. Table 2-2, include their low cost (the least expensive of all irons), their ready availability, their capability of being flame hardened with a water quench, and their very good machinability. A major limitation is that their structural strengths are only fair.
For large areas, the stencil is stepped along the sheet until the desired area is covered; however, this is usually not necessary since only one or two potentially critical areas need be gridded on each panel. Once the pattern is etched into the sheet, the grid is not removed by rubbing the part over the die nor is it removed by applications of oil or chemicals. The marked sheet is placed in a tryout press and formed, approaching as nearly as possible the conditions under which the part is to be formed in production.
It is now possible to calculate the stretch forming ratio and draw forming ratio as follows: the FLD. These techniques allow the benefit of corrective action to be quantitatively measured and compared with previous forming conditions. APPLICATION OF TECHNIQUES The following example shows how the FLD and SA techniques eliminated an unacceptable fracture rate and allowed a gage reduction on a part that had been a problem for many years. Fractures were encountered in the sidewall of a drawn corner formed from an unclipped blank (see Fig.