US 1074824 A
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NNNNNN OR SSSSSSS ES F. L. 0. WADSWORTH.
MEANS FOR DENSIFYING METALLIC SURFACES.
APPLIG 6, 1911. jifl'yl ggg Patented Oct. 7, 1913.
2 SHEETSSHBET 2.
W' Li 33 VENT FRANKL. Oi WADSWOR'IH; OF SEWICKLEY; PENNSYLVANIA.
MEANS; EQRL-DENSBEYINGPMEWA'LLIG .SUIRFAGEB.
Specification of Letters Tatum;
Patented Oct. '7, 1913.
Application filed February 6, 1911. Serial Km 606,898.
To all whom it may concern Bait-known that-I, F RANKUL. .O. VVADS- wmrrn,residingat Sewickley, in the county.
of Alleghenv and .State of Pennsylvania, a
citizen of tlieUnited States, have inventedor discovered certain :new and-'use ful Improvements in Means fr Densi'fyi-ng .Metallie Surfaoes,-of which improvementstl-ie following is a specification.
The-invention relates tothe densification of the surface portions of metallic articles, and has-for -its object the provision of improved means for effecting such densification, and .in a moreithorough and efficient manner.
The surfaces of metallic articles have heretofore beeni-densified byfirst rolling upon said surfaces closely arranged projections and depressions, and then rollingdown the roughened surfaces between smooth rolls. The rolls for roughening the surfaces of the metal piece have usually been marked by cutting their operating surfaces in annular grooves and cross-grooves, thus forming upon them a multiple of projections of a quadrilateral cross-section. By marking the rolls as hereinafter described the expense of marking is reduced, the pattern is more durable, and a more effective and thorough densification of the product is attained.
In the accompanying drawings Figure 1 is a plan View of a portion of a roll or other die surface embodying the invention; Fig. 2 is a cross-section on the line 11-11 of Fig. 1; Fig. 3 is a cross-section on the line IIIIII of Fig. 1; Fig. 4 is a View in elevation of a stand of rolls suitable for the practice of the invention, the reduced scale however not permitting a complete portrayal of the marking; Fig. 5 is a perspective view of a portion of one surface of a metal plate' after having been subjected to the action of one of the marked roll-surfaces; Fig. 6 is a View similar to Fig. 1 illustrating a modified form of marking; Fig. 7 is a cross-section on the line VII-VII of Fig. 6; Fig. 8 isa view similar to Fig. 5 of the surface of the product of the roll or die of Fig. 6; Fig. 9 illustrates conventionally the roughening and rolling down of the surface of a piece of metal.
In the embodiment of the invention illustrated in Fig. 1, the roll or other die surface for roughening the surface of the metal piece is covered with pyramidal indentations 1 of triangular cross-section. Theseindenta- :tLO'IlS a-PeOf uniform dimensions and are arranged in rows,--edge to edge, with the apices of the triangular edges of adjacent indentatrons in. each. row pointing inopposite direct1ons,- and each arranged apex to apex' and base to base with like indentationsv in the ad acent rows. Thus, as shown, the edges of the indentationstogether for-m transverse and. diagonal intersecting. ridges or facets 2, symmetrically; disposed over the entire marked surface of the roll or die.
The operating surfaces of-the rolls 3, 4 and-5 ofthe stand shown in Fig. 4, which form. the-four initial passes a, I), 0 and 0!,
.may all. be marked in themanner-described,
with indentations gradually. decreasing in dimensions at each succeeding pass. The surface of the lower roll 3 in the fifth pass 6 may. also be marked as shown, while the surfaces of the rolls 4 and 5 forming the sixth pass f will be left smooth. It will be understood however that either or both surfaces of the piece may be roughened in as many or as few passes as may be desired, and may be smoothed in another pass in the same stand of rolls or in a separate stand.
In the use of a stand of rolls such as is shown in Fig. 1, for the formation and treatment of a flat plate or strip of metal, the piece after having been heated is first fed forward through the lower pass a, whence it emerges with both of its fiat surfaces cove-red by upstanding adjacent pyramidal projections 6, as shown in Fig. 5, with their bases abutting against each other, and all faces of each projection exposed to the effect of the air or other substance with which these marked surfaces may be brought into contact. The piece is then returned through the upper pass I) and the operation repeated, as also in the next passes 0 and d. In the fifth pass 6 the projections upon the upper face of the piece will be smoothed down, and in the final pass f the projections on the lower face will be smoothed. In this final compression of the pyramidally .marked surfaces each to a smooth surface,
there will be a material densification of the surface portions of the piece in lines parallel with the general plane of its surface.
In Fig. 6 there is illustrated another arrangement of the indentations in the die surface, the edges of corresponding indent-ations in adjacent rows facing in the same 7 each indentation strikes the center of the direction, so that the apex of the edge of base of the edge of an indentation in the next row.
. By marking the operating surface of the roll or die With pyramidal indentations, with the edges of adjacent indentations coinciding as described, a much stronger and more durable die surface is obtained than in the case of a surface provided With separate and distinct prOjectio-ns, while at the same time the maximum Working and densify'ing action is insured. While the indentations may have more than three faces, it is preferred to make them of triangular crosssection as described, since there is thereby obtained a maximum of operative surface area for a given mass of metal. Thus not only is the metal piece most effectively Worked, but it is given a ver large surface area exposed to the cooling e ect of the rolls and of the surrounding atmosphere. I
-I claim as my invention: l. A die for use in the process of densifying the surfaces of metallic articles by first roughening and then smoothing the surface to be densified, having formed 1n its operat ing surface closely adjacent pyramidal indentations. I
2. A die for use in the process of densify- ,ing the surfaces of metallic articles by first roughening and then smoothing the surface to be densified, havin formed in its operating surface pyrami al indentations, each edge of each indentation coinciding with an edge of an adjacent indentation. V
3. A die for use in the process of densifying the surfaces of metallic articles by first roughenin and then smoothing the surface to be densified, having formed in its operating surface pyramidal indentations of triangular cro'ss-section arranged edge to edge.
at; A rolling mill for densifying the surfaces of metallic articles, having formed in the surface of one pass pyramidal indentations of triangular cross-section arranged edge to edge, and having a smooth-surfaced succeeding pass. i
In testimony whereof I have hereunto set my hand.
FRANK L. O. WADSWORTH. Witnesses: v
G. G. Tana, FRANCIS J. ToMAssoN.