US2348491A - Shear - Google Patents

Description

May 9, 1944 J. M. OMALLEY ETAL 2,348,491

JOSEPH N. OVALLEY FRED- B. Ear' May 9, 1944- J. M. oMALLl-:Y Erm. 2,348,491

Josz'PH N. ONALLEY FRED B. FIQY @Mft/@M tion:

Patented May `9, 1944 '.UITED' -sussa `Jmnnomneymsneanm,wmer,

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i chime (el. 1st-iz) This inventionrelatestosheamandmore particularlytoilylnsshearscapableofseverlngthe mddly traveling hot metal product of a rolling It is one object of the invention to provide a yinl shearcf ,comparatively simple and .inexpensive construction and thoroughly dependable in operation. j

It is a further object of the invention to provide a flying shear capable of cutting metal bars while they are traveling at relatively high speeds.

It is a further obiect of the invention to provide a flying shear suitable for cutting rolled metal bars as they travel from the finishing stand of amerchantmilltothecoolingbed.

With these and other objects in view, as will be apparent to those skilled in the art. the invention resides in the combination oi' parts set forth in the specification and covered by the claims appended hereto.

Referring to the drawings illustrating one embodiment of the invention and in which like reference numerals indicate like parts.

Fig. 1 is a plan view of a flying shear. with certain parts 'broken away for clearness of illustra- Fig. 2 is a side elevation or the shear, likewise with certain parts broken away; l

lllg.3isasectiononthelinellofFig.l; `1113.4isasectiononthelineI-loflllll'.1;

Fig. 5 is a fragmentary elevation taken on the line55ofFlg.1;and l v Fig. 6 is an electrical wiring diagram.

The embodiment Illustrated comprises a frame Il in which are journaled two -parallel horizontal shafts II mounted one above the other so that the metal bars to be severed may travel between them. Vn each shaft there is mounted an arm I2 provided with a blade Il, these arms normally converging rearwardly toward the on-coming bars at an angle of approximately ninety degrees. These bars approach the shear from a merchant rolling mill or the like'along a horizontal guideway I5 and are directed between the blades Il -by means of a forwardly converging trough I6. The rear end of this trough is connected to the guideway I by a vertical pivot pin I8, and its front endrests on the frame III. After leaving the shear the bars travel sione a nenzontei guideway ls which ma# lead to a cooling bed (not shown) Power actuated means is provided to swing the arms I2 simultaneously ina forward direction and thereby sever the bars. YFor this pm'pose the frame Il,andontheoutercndofeachshaftthere `ismountedanprlnllwhichextenxisinsubstantially the same direction as the corresponding blade-supporting arm l2. These arms are connected hylinks Iltotheoppositeends oran uprightbar whichiscarrledbytheslidable pistonrodllofailuidmotor 2i. Thismotor ccmprises a horizontal cylinder 21 `mounted on the frame II at one side of the guideway" Il, and parallel therewith. Within the cylinder there is provided a slidable piston 2l which is secured to thefrontendofthepistonrodl. Thlsrodiv 'snowh with a rearward extension n which is sud- 'sbly supportedin a guide 3| mounted on the side of the frame Il. Near the rear end of the cylinder 21 there is provided an inlet port I3 to which a suitable pressure iiuld,.such as compressed air, is supplied through a pipe u. Near the front end of the cylinder there isprovided an exhaust port which is controlled by a slidable exhaust valve 31 having `a, stem ll extending forwardlytherefrom. 0n the front end of the cylinder 21 there is moimteda bracket Il which supports a solenoid 4I having a vertically reciprocable plunger I2. This plunger is connected to the iront portion of thevalve-stem`3l by means or a bell crank lever The bracket 3l has a lug I5 thereon to support a screw It located directly in front of the valve stem Il. This screw forms an adjustable stop to limit the forward movement of the valve stem and thus control the amount the valve 31 can open. A'restricted by-pass is provided for 'the piston 28, and as shown in Fig. 2 this by-pass' shafts Il are extended outwardly beyond the 5 maybeintheform ofasmallportll throughthe piston itself. These. various parts are so constructed and arranged that upon energization of Ythe solenoid II, the plunger 42 will be drawn upwardly, sliding the valve 31 forwardly and opening the exhaust port 35. The air will immediately exhaust from the front end of the cylinder 21, allowing the compressed air in the rear end of the cylinder to force the piston forwardly, thus swinging the blades I4 forwardly into engagement with the stock to sever the same. Since the effective length of the blade-supporting arms I2 is about twice that of the driving arms 2l, the blades I4 will travel at approximately-twice the speed of the piston. Shortly after the blades have passed the mid-point of their travel and severed the' stock. the piston will close the exhaust port 35, thus trapping air in the front end of the cylinder to form a cushion and aid in decelerating the piston. Upon de-energization of the solenoid 4 I the weight of the released plunger 42 will slide the exhaust valve I1 rearwardly and means. is provided to energize with the stock, the stock is moved laterally to one side of the blades. For this purpose the trough The piston 2s wm be et the vrear ena ofthe cylinder 21, and the blades Il will be at the rearmost points in their arcs of travel. The piston 52 will be at the inner end of the cylinder il, and the trough I6 will be positioned to guide the stock directly between the blades Il. Whena out is to be made, the operator will simply close 'the push button I2 momentariLv. This will energize the solenoid-4I, liitingzthe plunger I2, and pulling the valve stem 38 forwardly against the stop IB. The air in the front end oi'lthe cylinder will thereupon escape through the port "iisswuzuglaterallybymeansoiafiuidmotor 50 into the position indicated by the broken lines in Fig. 1. This motor comprises a horizontal cyl-l inder Slmolmtedontherearportion'oftbe frame Illwithitsaxs transversetothelineoi stock travel. Within the cylinder there is provided a slidahle piston 52 from which a piSt0n` rod 5I extends inwardly, this rod being connected by alink 55 to the trough I6. Themovements ot the piston 52 are controlled by a vslidable foin-way valve 5l from which ports 58 and 59 leadtotheinnerandouterends oithecylin- .derrespectivelylthis valve being supplied with a suitable pressure iuid, such as compressed air, throughs. pipe 6I. 'A stem 62 extends fromthevalve 51andthe outerend ofthis stem is connected by a bell-crank lever 63 (Fig. 5) to the vertically reciprocable plunger 65 of a solenoid Si.

cylinder 5i. These parts are so constructed and arranged that upon energization of the solenoidA This solenoid is supported by a bracket 61 molmted on the outer'end of the 35, and the compressed air in the rear end of the cylinder will immediately expand and force the piston 29 forwardly. This will swing the arms l2 and the blades il forwardly to sever the to the inner end of the cylinder 51,-while at the Y same time opening the outer end of the cylinder to .the atmosphere through the port 59. The piston-52 will thereupon move outwardly, swinging the trough I5 and moving the stock out of the path of the blades I4. Upon de-energization of the solenoid Si, the weight of the plunger v65 vwill causeit to descend, the valve El outwardly to the position shown in Fig. 1. This will admit compressed air to the outer end o! the cylinder and exhaust air from the inner end, so that the piston will move inwardly and return the trough I6 to its original position. l

It is important that the trough I6 should move the stock out of the path of the blades Il very soonafter the cut has been completed, and that the stock should not be returned until the blades have'swlmg back suiiiciently to avoid interference therewith. In order that the apparatus may operate in this manner automatically, the solenoid B6 substantially at the time the blades reach the ertical plane delined by the axes of the shafts 1I I, ontheir 'cutting stroke, and to maintain this energizationimtil the blades reach the same positionron their return stroke. For this purpose a switch Slis mounted beneath the lower arm 2| in a position to be closed at the proper time by a sector 'Il which projects from the hub portion of tbis'lower arm. As shown in Fig. 6, the switch Il isconnected in series with the solenoid Si vacross a suitable source 1| of electricity. The solenoid Il is connected in series with a push button switch 12 across the source 1l.

The operation oi the invention will now be apparent from the above disclosure. With the solenoids ll Aand both de-energized the parts stock.l By proper adjustment of the screw which determines the amount of opening ol.' the Aexhaust valve 31, the operator can regulate the speedothepistonandthuscausethespeed oithebladesatthetimeoi' the cuttobesulstantially equal to the speed of thestock. Because of the simple and direct connection between the piston and the blades, the moving parts have a comparatively low inertia, and it is possible to obtain very rapid acceleration. Furthermore, the speed of the blades is approximatelytwice thatofthepiston. Forthesereasons the shear is adapted for `severing very rapidly traveling bars. At substantially the time the cut is completed, the sector 10 will close the switch 69 and thus energize the: solenoid 66. This will raise the plunger 55, slide the valve 5l inwardhr, andcause the motor 58 to swing the troughii outwardly, thereby moving the stock laterally away from the path of the shear blades. By the time the main piston 29 reaches the exhaust port 35 and begins to deoeleraie from the compression of the air trapped in the iront end of the cylinder, the solenoid Il will be de-energized and the weight of the plunger 42 will have closed the exhaust valve 3l. The air pressures on the two sides oi' the piston will soon equalize through the port and the piston will move rearwardly because of the larger eiiective area. oi its front face. As the blades Il pass the midpoint of their travel on the return stroke, the sector 'lll will allow the switch S9 to open, de-energizing the solenoid 86. VThe plunger 85 willl thereupon descend, pulling the valve 51 outwardly and causing the motor 50 to swing the trough IB inwardly to its original positon. so that the stock will again travel between the blades Il in readiness for the next cut.

The apparatus is comparatively simple and inexpensive to manufacture, thoroughly dependable in operation, and well adapted for use in conjunction with a merchant rolling mill.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A yingshear'for severing stock as it travels longitudinally in a generally horizontal directionwill occupy the positions shown in the drawings. swing them forwardly and then rearwardly. and

guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

2. A flying ,shear for severing stock as it travels longitudinally in a generally horizontal direction comprising two parallel horizontal shafts located respectively' above and below the line of stock travel, two blade-carrying arms on the respective shafts normally converging rearwardly toward the `on-coming stock, a blade on each arm, an actuating arm on each shaft, extending substantially parallel with the corresponding blade-carrying arm, a fluid-pressure actuated motor spaced forwardly from the actuating arms, the motor having a piston rod which extends rearwardly substantially parallel with the line of stock travel, links connecting the piston rod with the actuating arms to swing -them forwardly and then rearwardly, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

3. A flying shear for severing stock as it travels longitudinally in 'a genenally horizontal direction comprising two parallel horizontal shafts located respectively above and below the line of stock travel, two blade-carrying arms on the respective shafts normally converging rearwardly toward the on-coming stock, a blade on each arm, an actuating arm on each shaft extending substantially parallel with thecorresponding blade-carrying arm, the effective length of the actuating arms being considerably less than the effective. length of the blade-carrying arms, a fluid-pressure actuated motor spaced forwardly from the actuating arms, the motor having a piston rod which extends rearwardly substantially parallel with the line of stock travel, links connecting the piston rod with the actuating arms to Aswing them forwardly and then rearwardly, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

4. A ying shear for severing stock as it travels longitudinally in a gener-ally horizontal direction comprising two parallel horizontal shafts located respectively above and below the line of stock travel, two blade-carrying arms on the respective shafts normally converging rearwardy toward the on-coming stock,.a blade on each arm, an actuating arm on each shaft extending substantially parallel with the corresponding blade-carrying arm, a cylinder spaced forwardly from the actuating arms, a piston slidable in the cylinder, a port for the admission of pressure fluid to the rear end of the cylinder, a port for the exhaust of fluid from the front end of the cylinder, a valve to control the exhaust port, a restricted by-pass port for the piston. a piston rod extendin g rearwardly from the piston, links connecting the piston rod with the actuating arms to swing them forwardly when the exhaust valve is opened and then rearwardly when the exhaust valve is closed, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearw-ard movement. A

5. A ying shear for severing stock as lt travels longitudinally in a generally horizontal direction comprising two parallel horizontal shafts located respectively above and below the line of stock travel, two blade-carrying arms on the respective shafts normally converging rearwardly toward the on-coming stock, a blade on each arm, an actuating arm on each shaft extending substantially parallel with the corresponding blade-carrying arm, a fluid-pressure actuated motor spaced forwardly from the actuating arms, the motor having a. piston rod which extends rearwardly substantially parallel with the line of stock travel,

links connecting the piston rod with the actuating arms to swing them forwardly and then rearwardly, laterally swinging guide means for the stock approaching the blades, a motor connected to the guide means to swing the same. a pilot device for the last-mentioned motor, and actuating means for the pilot device arranged to cause the guide means to move the stock laterally out of the path of the blades when they have swung forwardly past their cutting position and then to move the stock laterally back into the path of the blades after they have swung rearwardly once more. A

6. A ying shear for severing stock as ittravels longitudinally in a generally horizontal direction comprising two parallelhorizcntal shafts located respectively above and below the line of stock travel, two blade-carrying arms on the respective shafts normally converging rearwardly toward the on-coming stock, a blade on each arm, an actuating arm on each shaft extending substantially parallel with the corresponding blade-carrying arm, a fluid-pressure actuated motor spaced -forwardly from the actuating arms, the motor having a piston rod which extends rearwardly substantially parallel with the line of stock travel, links connecting the piston rod with the actuating arms to swing them forwardly and then rearwardly, laterally swinging guide means for the stock approaching the blades, a fluid-pressure actuated motor connected to the guide means to swing the same, a pilot valve for the last-mentiond motor, a solenoid to actuate the pilot valve, a switch to control the solenoid, and actuating means for the switch arranged to cause the guide means to move the stock laterally out of the path of the blades when they have swung forwardly past their cutting position and then to move the 'stock laterally back into the path of the blades after they have swung rearwardly once more.

7. A iiying shear for severing longitudinally traveling stock comprising a pair of cooperating blades plvotally supported about parallel axes on opposite sides ofthe stock, the axes extending transversely of the stock, means to swing the blades forwardly through arcuate paths to sever the stock and then rearwardly through the same paths to their original positions, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

8. A fiyingshear for severing longitudinally through the same lpaths to their original sta tionary positions, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

9. A flying shear for severing longitudinally traveling stock comprising two parallel shafts on opposite sides of the stock,l and extending transversely thereof, a blade carried by each shaft, means to turn the shafts inone direction to swing the blades forwardly through arcuate paths to sever the stock and then in the reverse direction to swing the blades rearwardly Vthrough the same paths to their original positions, and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward movement.

10. A ying shear for severing longitudinally traveling comprising two parallel shafts on op .posite sides of the stock and extending transversely thereof. two blade-carrying arms on the respective shafts normally extending rearwardly from the plane defined by the shaft axes, a blade on each arm, means to turn the shafts in one direction to swing the blades forwardy through arcuate paths to sever the stock and then in the reverse direction to swing the blades rearwardly through the same paths to their original positions. and guide means to direct the stock between the blades during their forward movement and at one side of the blades during their rearward. move- JOSEPH IM. OMALLEY. FRED B. FAY.

l0 ment.

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