Transactions of the American Foundrymen's Association Volume 19 - Tapa blanda

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ...true in light work such as automobile castings, piston rings, etc. In the table is also a statement as to the size of the sample from which the drillings were taken, as this will affect the combined carbon. At least one wedge in each set was chilled on one face to see what effect the chilling would have on the metal. In most cases it simply closed the grain, while in some cases a white chill showed distinctly. The specimens as received were given arbitrary numbers, so that they could be identified after analysis and after testing, and for this reason the numbers in the first column of the table are not consecutive, but refer simply to the experimental records. The second column of the table is headed "Kind of Iron," and under this caption is given the name of the metal as it is commonly known in the foundries where it is used. The first specimens in the table are Nos. I, 2, 3, and 4. This represents what is known as the regular or machinery iron of the Root & Vandervort Co. This is used for gas and gasoline engine castings and for certain automobile castings. The fracture of the small wedge unchilled is shown in Fig. 1. At the left is the fracture of the metal where it is about rV of an inch thick, and at the right the fracture where it is a little over lj inches in thickness. This casting is soft and gray throughout its entire length and even the thin casting could be machined, though it is fairly hard. The fracture of the large portion shows that this is quite an open iron, which would not be suitable for large work, but should be well fitted for strong castings up to an inch or an inch and a quarter in thickness. The strength is fairly high and the deflection good. In Fig. 2, a fracture of the same iron which has been chilled is shown. It w...