US2348283A - Burr masher - Google Patents

Description

May 9, 1944.

F, D. DOLAN BURR MASHER Filed May 9, 1941 2 Sheets-Sheet 1 May 9, 1944.

BURR MASHER Filed May 9, 1941 '2 Sheets-Shet 2 F. D. DOLAN 7 Patented May 9, 1944 BURR MASHER Francis Daniel Dolan, Dundalk, Md.,

assignor to Bethlehem Steel Company, a corporation of Pennsylvania Application May 9, 1941, Serial No. 392,739

1 Claim.

This invention relates to a device or apparatus for treating the edges of sheet or strip metal, and particularly to a device or apparatus for flattening or mashing the edges of cut strips of steel or other metal to remove roughnesses or burrs caused by the operation of a prior cutting device.

It is well known that trimming the edges of cold rolled steel strip and the like in a rotary or similar shear, especially if the shear is somewhat dull, is apt to produce a slight burr on the sheared surfaces. Heretofore this objectionable surface defect has been eliminated in one of two ways,

by filing or by edge rolling. Filing has been done by means of a filing board consisting of a narrow plate on which are fixed a number of small rectangular files kept in contact with the edge of the strip by springs, while in edge rolling suitably grooved rolls revolving on their vertical axes are used to produce the required edge.

One object of my invention is to lessen the friction of these previous arrangements, which causes a needless and wasteful expenditure of power.

Another object of my invention is to provide a more rapid and efiicient means of removing burr from the edges of metal strip or the like.

Another and further object is to provide a burr masher which is quickly and easily adjustable for different widths and gages of strip.

Still other objects, purposes and advantages of my invention will appear in the following specification and claim.

With this general description of my invention,

I shall now, in order to make the same more clear, refer to the annexed two sheets of drawings forming a part of this specification and in which like characters of reference indicate like parts.

Figure 1 is a diagrammatic top plan view illustrating the operating position of my burr masher in relation to the feeding, levelling and shearing apparatus;

Fig. 2 is a vertical longitudinal section taken On I the line 2-2 of Fig. 1;

Fig. 3 is a side elevation of my burr mashing apparatus showing the strip and a portionof the side frame in section;

Fig. 4 is a vertical section through the journal bearings and supporting frame for the roller shafts associated with the burr masher taken on the line #4 of Fig.5;

Fig. 5 is a transverse section view taken on the line 5-5 of Fig. 4-; and

Fig. 6 is a detail section view of one of the burr masher rollers illustrating the manner of adjustably attaching it to its supporting arbor.

In the particular application of my invention which I have illustrated, with special reference to Figs. 1 and 2, coil of strip I mounted on rotatable uncoiling-device or mandrel 2 and directed by guide plates 3 is fed through shear rolls 4 which trim the strip to length. Thence the strip passes between the tapered rollers 5 and 6 and bottom roll 1 of the burr masher. Said tapered rollers 5 and 6 bend down andflatten burrs on the side edges of the strip against said bottom roll 1 without changing the cross section of the strip. The strip passes thence between levellin rolls 8 on leveller frame 9, and is then cut into sheets by a shear consisting of knife blades I0 mounted in two revolving drums H, dropping finally onto moving belts l2 driven by rollers I3 which remove the sheets for inspection and sortmg.

The burr masher proper, shown in more complete detail in Figures 3 to 6, inclusive, comprises an edging or flattening device mounted on leveller frame 9 by face plates ll bolted or otherwise suitably fastened to the leveller frame at each inner side thereof. Side frames l5 formed in a U-shape with the opening upward enclose and support bearing boxes I6 and I1, provided with grease holes I8 and glands I 9, in the upper one of which on each side on ball bearings 20 is joumaled a horizontal shaft or arbor 2| provided with a key way 22. In the lower bearing boxes I! on ball bearings 23 on each side beneath the arbor 2| is journaled bottom roll. 1 over which the strip passes. Across the top of each side frame I5 is fastened flat strap or member 24, and spring 25 and spring seat 26 are adjustable to give the degree of pressure desired on the strip by pressscrew 2'! threaded in strap 24. Rollers 5 and 6 tapered very slightly at 28 to avoid marking the strip are held in position in the keyway 22 on the shaft by keys 29, and are adjustably movable along the shaft for the sheared width of strip, being held in adjustment by set-screws 30. Bottom roll 1 is vertically adjustable by press-screw 3|. It should be noted that the taper at 28, which consists in a slight, diminution in the enlarged middle portion of the roller longitudinally toward the center of the shaft or arbor 2|, on a roller 4 inches long and 3.5 inches in largest diameter for strip .010 or lighter gage, such as is used for tin plate, is of the order of .008 inch or an angle from horizontal about one-half of a degree or less and is therefore too small for effective illustration.

I have herein shown the strip as pulled through the rollers by levelling rolls 8, which in turn are "essential scope and spirit.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

A burr masher like, comprising a. pair 01' supports relative to which the strip is led, a U-shaped side frame secured to each support, bearing boxes slidably for moving metal strip or the I mounted in each side frame, an arbor journaled in the upper bearing box on each side, a keyway on the arbor, adjustable rollers having a slight inward taper keyed to the keyway on the arbor and rotated by frictional contact with the moving strip, a bottom roll iournaled in the lower bearing'boxes, a metal strap fastened across the top of each side frame, a coil spring beneath each strap for holding the bearing boxes in position, a press screw threaded through each strap for adjusting the pressure or the spring, and a second press-screw threaded through the bottom of each side frame for vertically adjusting each lower bearing box.

FRANCIS DANIEL DOLAN.

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