US2390274A - Pinch type bending roll method and means - Google Patents

Description

Dec. 4, 1945- J. c. ROSE arm. 0,

PINCH TYPE BENDING ROLL METHOb AND MEANS Filed July 25, 1942 2 Sheets-Sheet 1 JESS c. ROSE 'INVENTOR GEORGE 5. smmrsy 7 T NE}! Dec. 4, 1945. J. c. ROSE ETAL 2,390,274

PINCH TYPE BENDING ROLL METHOD AND MEANS Fild July 25, 1942 2 Sheets-Sheet 2 J a S INVENTOR GEORGE STANKEY Patented Dec. 4, 1945 Jess 0. Rose and Calm, assignors to Angelcs, Calif...

George E. Stankey, Los Angeles,

Bardwell & a. corporation of California McAlister, Los

Application July 275, 2, Serial. No. 2.306

Claims.

hi n e n re a es enerall to the art of .nd g n arly e tend d stock of various cr ssectional shapes to predetermined curvatures by m ans f pinch-type bending ro ls, and he g neral object of the invention is the provision of improved methods and means for supp rting the stock as it is run through the bending oll.

In bending stock by means of pinch type bend, ing rolls, the stock is passed between two rolls which'closely support or pinch? the metal between them as it is bent. A. leading r011 supports the stock just ahead of the two pinch rolls, and a. forming.rol1 engages and deflects it just beyond them, causing the metal to bend at the pinch rolls. The aim in operating such bending rolls is to confine e metal ely at t e pinc rolls, i. e., at the point of bend, so as to control the, flow of the metal (which must be stretched at one edge and packed or shrunk at the other) in such a way as to avoid wrink ing. buck1ing,twisting or other distortions. Pinchty e bending rolls v be n ery successiully us d n the past to bend certain angle and other sections when the metal is of some substantial thickness. However, with relatively thin stock, say of 3%? thickness or ess, reat. difli u ty is ncountered. As a matter fa it has here o ore been absolutely impossible to end l ht ua e angle and other sections, made up for instance of stainless steel, without w n l n or buck t e meta The primary object of the present invention is therefore the provision of a method and means for bending relatively light guage stock of various cross-sectional shapes by me ns of conventional pinch typebending rolls. .In accordance with the invention, the relatively light guage stock to b r n thr u h the bend n Fi 2 is a side e evat on of the s biect mat e sh w in F g.1;

pa b ok n a ay, a r of spring P d ith a. -se tion st i packed therebetween;

Fig. 3 is a transverse section taken on lin 3-4 of ig. 2; i

Fig. 4 is a transverse section taken on line 4-4 of Fig. 2; a

Fig. 4a is a modification;

Fig. 5 is a transverse section taken on line 5-.-5 of Fig. 2 i V Fig. 6 is a schematic side elevation of a pinchtype bending roll adapted to carry out the present invention;

Fig. 7 i a section view similar to Fig, 4, but showing a on line l--'! of Fig. 6:

ig. 8. is a section on lin 8?8 of Fig. 6;

Fig. 9 is a section on line 9.9 of Fig. 6;

Fig. 10 is a view similar to a portion of Fig, 1, but showing a modification;

Fig. 11 is a transverse section on line i [*H of Fig. 10;

Fig. 12 is a view similar to Fig. 6, but showing additionally the use of a side thrust roller designed to impart a curvature to the stock in a direction at right angles to the direction of bend normally imparted by the bending roll; and c Fig, 13 is a view taken as indicated by line l3-l3inFig. 12. i

Figs. 6 to 9, inclusive, show schematically a fore or less conventional pinch-type bending roll, such as may be utilized in practicing the present invention; for a. more complete disclosure of such a bending roll, see our Patent .No. 2,335,028- entitled fPinch type bending roll issued November 23, 1943. This bending roll comprises two pinch roll shafts 20 and 2|, either one of which, or both, may be driven through any suitable driving arrangements. Shaft 20 carries a series of three rolls 22, 23, and 24, of which rolls 22 and 24 are of the same diameter, and roll 23 is of a lesser diameter as typically shown in Fig.7. Shaft 2| carries a singl roll 25., a marginal portion of which is received in the space between the rails 22 and 24.

The peripheries of the opposed rolls 23 and 25 together with portions of the side faces of rolls 22 and 24 define a rectangular opening or passageway for the stock Ahead of the pinch roll shaft is aleading roll 26, which idles on, a suitable spindle 21. nd which c m rises hre d ks 6a, 2 12 and 260 definin a groove 28 adapted to receive and confine laterto be bent and the-flexible supporting elements, as presently to be described.

v to impart to fine laterally the stock and supporting elements therefor, this roll 33 being mounted on a shaft 32, which may be driven, through any suitable arrangements not necessary here to illustrate, so as disk 30b defining the bottom of groove 3| rotation at the same peripheral speed as pinch roll 25, the rolls 30 and of course turning in the same direction.

Assuming the member S to be formed to be, for instance. of Z-section (see Fig. 4), the procedure is as follows: The member S is packed between two sets or pads 40 of long, flat spring elements or leaves 4|, the web 42 of the Z-section member being abutted by the longitudinal edges of the spring leaves of each pad, and eachpad being of a thickness substantially equal to the height of the web of the Z-section member plus the thickness of one of its flanges. These leaves 4! are preferably slightly greater in width than the widths of the flanges 43 of the Z-section member, and they are preferably formed of spring steel, of a thickness of the order, typically, of .031", though this is subject to modification; In Figs. 1 and 2, a substantial portion of the lengths of the spring pads and Z-section member have been broken out. It is to be understood that these members may be of any length; for instance for a Z-section member of a length of 6, the spring pads may be '7 in length. They should in any case be at least approximately one foot longer than the stock to be bent.

Leaves 4| of each spring pad 40 are preferably integrated at the nose ends of the pads; forinstance, as indicated at 44in F g. 2, the leaves may be brazed each to inch or an inch and a half at the nose ends of the pads. The brazing material is not only applied along the edges of the spring leaves, but sweated in between them so that, in effect, the spring pad is made solid at its nose end. The two pads 40, with the Z-section member S packed therebetween. are preferably provided with an encircling band 46, which secures the pack in assembly and which is slidably mounted on the pads, so that a rearward direction, and finally pulled off the rearward ends of the pads as the pads go into the bending roll.

Thelongitudinal edges of spring pads4ll support the web 42 of member S during the bending operation. but leave the flanges 43 unprotected and subject to wrinkling. To support these flanges 43, long, flat spring members or leaves 41, formed of spring steel. and of widths approximately double the widths of the spring leaves 4!, are placed at the top and bottom sides of the pack. in such manner that one-half of each such member 41 lies flat against the otherwise exposed face of one of the flanges 43. The other halves of the members 41 engage the op osed spring pad 40, as clearly shown in Fig. 4. These members 41 are made as thick as possible consistent with bending through the curved path which they must follow. and may be of thicknesses ranging typically between /8" and A1", though this is of course not to be taken as limitativee The pack P as thus assembled is then run through the bending roll as a unit, the encircling band 46 being moved in a rearward direction on the pads as the pack goesinto the bending roll,

being finally removed'from the rearward ends of the pads. I

r The pads 40 will be understood to be of such widths that, taken together with the thickness of the web 42 of the member S to be bent, the total the next for a distance of an it can be manually moved in cation of the set-up for a member S' thickness dimension of the pack is such as will just be received, with comparatively close-sliding fit, between the rolls 22 and 24 of the bending roll (see Fig. '7), and adjustments are so made that the vertical thickness of the pack, measured between the outside faces of the two outside spring leaves 41, is such as will just permit the pack to be received between the rolls 23 and 25, the latter pinching the pack between them with a pressure such as is usual in the operation of pinch-type bending rolls. It will be understood that in conventional pinch-type bending rolls, the two shafts 20 and 2| carrying the rolls 23 and 25 are vertically adjustable relatively to one another, and this adjustment is so made as to apply the proper pressure to the pack. The longitudinal edges of the spring leaves 4| making up the two spring pads 40, as thus confined between the lateral faces of the two rolls 22 and 24, support the full width of the web 42 of the member S which is to be bent, and the two flat spring members41, in cooperation with'the pads, confine and support the flanges 43. The spring pad 40, as well as the spring members 41, conform readily to the curved path for which the bending roll is adjusted, and the member S is bent to the desired shape, and because of the support provided, assumes such shape without wrinkling, buckling, twistng or becoming otherwise deformed. The close support provided for the member S on all its surfaces thus permits it to be shrunk" and stretched in different portions without introduction of the various distortions which have heretofore been inevitable with relatively light guage material.

The invention is of course not restricted-in application t0 the particular Z-sectio-n stock chosen for illustrative purposes. Fig. ie, for instance, which is a view similar to Fig. 4, showsa modifiof angle section. In this instance, the set-up is the same as before, with the exceptionthat, the member S havingbut. one flange 48, but one of the flat spring members 41 is needed Otherwise, the spring pads may be 49 of the angle member S'- being in this instance confined between the spring pads 4| thesame as the web 42 of the Z-section member S described first.

Figs. 10, 11, 12 and 13 show a modification of the invention which is employed when the stock is to be bent in two directions, one at right angles to the other. In such a case, the bending roll is equipped with an additional rollilL-whichis of a width substantially equal to the thickness of a spring pad, and which engages the lateral edge of the adjacent spring pad just beyond forming roll 3!]. In this instance, each pad, here designated by numeral a, and which, excepting for departures noted, will be understood to be the same as the pad 40, s so formed as to be flexible in two directions. Toaccomplish this, the'pad may be made up of a plurality of rods or bars Ma, flexible in both directions, and preferably of square or rectangular cross-section, as illustrated in Fig. 11. The stock S has again been illustrated as a member of Z-section, though this is of course not limitative, and the stock might equally as well be of angle or other section. The stock S being of Z-section, however, the two flanges 43 thereof are again supported bylong, fiat spring members or leaves 41, like the spring members 41 of Figs. 2 to 5. It will be understood that the lateral thrust roller of the bending roll will engage the adjacent pad 4041 between the the same as before, the web members 41, which are not laterally'flexible, and function to deflect the pads "a and the stock in a lateral direction, so as to impart to the "latter the desired lateral curvature.

The above description of typical procedures and instrumentalities for carrying the instant invention into effect will serve to impart a complete knowledge of the principles underlying the invention, and will enable the invention to be applied to stock of various cross-sectional forms not here specifically illustrated. Also, as will be evident, the particular illustrative procedures and instrumentalities are susceptible to considerable variation and modification without departing from the spirit and scope of the invention or of the appended claims.

We claim:

1. The method of bending relatively thin linearly extended sheet metal stock whose cross section includes a longitudinal web that is parallel to the plane of the bend, and a flange joined to an edge of said web and disposed at right angles thereto, by means of a pinch type bending roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said web, and with the pad on one side of the web abutting said flange, said spring pads being flexible in the direction the stock is to be bent, applyin a flat spring leaf against the exposed face of said flange, so as to pack said flange between the oneispring pad and said spring leaf, and passing the stock together with said pair of spring pads and leaf spring through the bending roll.

2. The method of bending relatively thin linearly extended sheet metal stock whose cross section includes a longitudinal web that is parallel to the plane of the bend, and a flange joined to an edge of said web and disposed at right angles thereto, by means of a pinch type bending roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said web, and with the pad on one side of the web abutting ,said flange, said spring pads each comprising a plurality of parallel spring elements which are flexible in the direction the stock is to be bent, applying a flat spring leaf against th exposed face of said flange, so as to pack said flange between the one spring pad and said spring leaf, and passing the stock together with said pair of spring pads and leaf springthrough the bending roll.

3. The method of bending relatively thin linearly extended sheet metal stock whose cross section includes a longitudinal web that is parallel to the plane of the bend, and a flange joined to an edge of said web and disposed at right angles thereto, by means of a pinchtype bending roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said Web, and with the pad on one side of the web abutting said flange, said spring pads each comprising a stack of parallel flat spring leaves whose longitudinal side edges engage the web, applying a flat spring leaf against the exposed face of said flange, so as to pack said flange between the one spring pad and said spring leaf, and passing the stock together with said pad or spring pads and leaf spring through the bending roll.

4. The method of bending relatively-thin linearly extended sheet metal stock whose cross section includes a longitudinal web that is parallel to the plane of th bend, and flanges joined to opposite edges of said web and disposed at right angles thereto, by means of a pinch type bending roll, that includes packing a pair of linearly extended spring ads against a posite surfaces of said web, and with each flange supported by an abutting spring pad, said spring pads being flexible in the direction the stock is to be. bent, applying flat spring leaves against the exposed faces of said flanges, so as to pack each said flange between a spring pad and a spring leaf, and passing the stock together with said pair of spring pads and said spring leaves through the bending roll. 7

5; The method of bending relatively thin line! arlyextended sheet metal stock whose cross Section includes a longitudinal web that is parallel to the plane of the bend, and flanges joined to opposite edges of said web and disposed at right angles thereto, by means of a, pinch type bending roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said web, and with each flange supported by an abutting spring pad, said spring pads each comprising a plurality of parallel spring elements which are flexible in the direction the stock is to be bent, applying flat spring leaves against the exposed faces of said flanges, so as to pack each said flange between a spring pad and a spring leaf, and passing the stock together with said pair of spring pads and said spring leaves through the bending roll.

6. The method of bending relatively thin linearly extended sheet metal stock whose cross section includes a longitudinal web that is parallel to the plane of the bend, and flanges joined to opposite edges of said web and disposed at right angles thereto, by means of a pinch type bending.

roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said web, and with each flange supported by an abutting spring pad, said spring pads each comprising a plurality of parallel spring elements which are flexible in the direction the stock is to be bent, applying flat spring leaves against the exposed faces of said flanges, so as to pack each said flange between a spring pad and a spring leaf, and passing the stock together with said pair of spring pads and said spring leaves through the bending roll.

'7. The method of bending relatively thin linearly extended sheet metal stock whose cross sec-v tion includes a longitudinal web that is parallel to the plane of the bend, and flanges joined to and turned oppositely from opposite edges of said web, by means of a pinch type bending roll, that includes packing a pair of linearly extended spring pads against opposite surfaces of said web, and with each flange supported by one of said spring pads, said spring pads being flexible in the direction the stock is to be bent, applying flat spring leaves against the exposed faces of said flanges, so as to pack each said flange between a spring pad and a spring leaf. and passing the stock together with said pair of spring pads and said s ring leaves through the bending roll.

8. ,The method of bending a relatively thin linearl extended member of uniform cross-section in a pinch type bending roll, said member having surfaces likely to become deformed during the bending operation, that includes setting up the pinch rolls of the bending roll to define a passageway for the member of rectangular crosssection and of greater cross-sectional area than the member, packing the member between a plurality of flexible longitudinally extending elements closely engaging and supporting said surfaces, forming said elements and member into a pack of cross-sectional size conforming to said passageway defined by said pinch rolls, and pass- 7 ing the pack longitudinally through said passageway.

9. A spring pad flexible in two directions at right angles to one another comprising a bundle of parallel linearly extended spring elements flexible in two directions arranged in a plurality of contacting vertical and horizontal rows and integrated to one another at one end.

10. Means for packing a relatively thin linearly extended sheet metal member whose cross section includes a longitudinal web parallel to the plane of the bend, and a flange joined to an edge of said Web and disposed at right angles thereto,

duringbending thereof in a pinch type bending roll, comprising: a pair of linearly extended spring pads consisting of a stack of relatively thin spring leaves adapted to be positioned adjacent oppositesurfaces of said web, and with the pad on one side of the web in engagement with the inside surface of said flange, and a spring leaf relatively thicker than the aforementioned spring leaves adapted to be applied to the outside surface of said flange.

JESS C. ROSE.

GEORGE E. STANKEY.

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