Press-working of metals by Smith Oberlin 1840-1926

Author:Smith, Oberlin, 1840-1926. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Sheet-metal work, Dies (Metal-working)
Publisher: New York, J. Wiley & sons; London, Chapman & Hall, limited
Published: 1901-03-25T05:00:00+00:00

pressure is very great, often exceeding the crushing strength of the metal. This, in its turn, is usually something greater per square inch of section than is the tensile strength.

Assembling. Analogous to forming processes proper are various operations where the assembling of two or more pieces is done, oftentimes upon the same general principle as the riveting down of an eyelet, or a rivet, which has been passed through two pieces of paper or metal. In general, some piece of metal which has previously been brought to shape by dies or otherwise is driven tightly, or perhaps dropped loosely, into or onto some other piece or pieces, whereupon they are all fastened together by some auxiliary forming process which bends or forms certain edges or surfaces in a manner best adapted to locking the various parts permanently together.

In this way two cup-shaped pieces are connected to form a certain style of door-knob; ornamental stamped-out parts are assembled into the stem of a gas-fixture; and the base-piece is fastened onto a cuspidor or coal-scuttle. Such work will be further set forth in the next chapter, under the head of curling, etc.

Involuntary Processes. In addition to the humanly invented processes we have been considering there are sometimes developed others which, to a careless observer, might seem to emanate from the brain and hand of his Satanic Majesty. Among what may thus be called involuntary processes is the very annoying one known as warping, which occurs especially in the products of embossing and forming dies, as well as to some extent in drawn-work also. The most favorable conditions for its occurrence are thin metals, large diameters, and edges so shallow as not to form stiff trusses in themselves. The die-maker is often blamed for work thus coming from the press twisted and sprung, so

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