RU1828619C - Trimming shears - Google Patents

Abstract

FIELD: metal pressure forming. SUBSTANCE: shears include the frame, supporting the lower cutters for longitudinal and cross shearing respectively; crank shafts; the beam with an upper cutter for longitudinal cutting; the holder with the upper cutter and with the connecting rod for cross shearing, mounted on the driven crank shaft. The shear beam is mounted on the crank shaft, rotatably joined with the frame by the tie rod. The link, connected with the crank shaft by the tie rod, is mounted on the crank shaft. A shearing edge of the upper cutter for longitudinal shearing has constant curvature. Upon operation a sheet is being fed between the cutters for longitudinal shearing, a lengthwise edge of the sheet is being notched, then it is being sheared in longitudinal direction and after in a cross direction. EFFECT: lowered energy consumption and metal consumption of structure of the shears. 2 cl, 7 dwg

Description

 The invention relates to the processing of metals by pressure and can be used on cutting sites of rolling mills.

 The aim of the invention is to reduce the energy and metal scissors.

 In FIG. 1 shows a top view of edge trimming shears; in FIG. 2, section AA in FIG. 1; in FIG. 3 section BB in FIG. 2; in FIG. 4-7 cutting steps.

 Trimming shears contain a frame 1, a knife beam 2 mounted on a crank shaft 3 and connected to a frame 1 by a link 4. The crank shaft 3 is connected to a drive crank shaft 5 of a crank gear including a link 6, mounted on the crank shaft 3, link 7, mounted on a crank shaft 5, for example, cantilever or between supports, and a rod 8. The crank shaft 5 is coupled by a clutch 9 to a gearbox 10, which is connected to an electric motor 11 by a clutch 12. A cross-cut connecting rod 13 connected to the holder 14 is mounted on the shaft axle 5. In the camp e 1 fixed lower horizontal slitting knife 15 with a straight cutting edge and the lower knife 16 for cutting the transverse sheet edges 17. The axes of the crank shaft 3 and 5 are arranged perpendicular to the cutting edge of the lower knife slitters. In the lower part of the knife beam 2, the upper knife 18 for longitudinal cutting with an arcuate cutting edge made with a constant radius is fixed, and the upper knife 19 for lateral cutting of the edge is fixed in the holder 14. The holder 14 moves in the guides 20.

 Rod 4 is connected to the bed 1 by an axis 21, and by a hinge 22 with a knife beam 2.

 Trimming scissors operate automatically as follows.

 In the initial position, the upper longitudinal cutting knife 18 is in its highest position, and the upper transverse cutting knife 19 is located above the sheet 17. The sheet 17 is fed along the live table and stops between the longitudinal cutting knives 18 and 15 so that the longitudinal edge is cut only when rolling motion of the upper knife. The knife beam 2 with the upper knife 18 is lowered by the amount of necessary overlap of the knives 18 and 15, and then the sheet 17 is cut with a rolling movement. After that, the idling of the upper knife 18 of the longitudinal cutting begins, at which the sheet 17 is simultaneously fed by the rolling table to the required calculation step. Then there is a repeated incision of the edge in the longitudinal direction, after which, with repeated idling of the upper longitudinal cutting knife 18, the sheet is again fed to a predetermined step and stopped. The upper edge cutting knife 19 lowers close to the sheet, and the upper longitudinal cutting knife 18 is above the sheet. There is a transverse cutting of the edge, previously cut in the longitudinal direction. After the end cutting of the edge is completed, the upper slitting knife 18 lowers close to the notched edge and cuts the edge in the longitudinal direction. At this time, the upper cross-cutting knife 19 moves up, and then the knife beam 2 with the upper longitudinal cutting knife 18 also moves to its original position.

 These cutting operations are repeated until the full lengths of the longitudinal edges of the sheet.

 In the prototype, the simultaneous cutting of the sheet edges in the longitudinal and transverse directions adversely affects the increase in cutting force and torque, since moments are superimposed (“peak” moments).

 Due to the separate cutting of the sheet edges in the longitudinal and transverse directions, there is a reduction in drive power and, consequently, energy consumption.

Claims (2)

 1. EDGING SCISSORS containing a bed, a slitting unit in the form of a lower knife fixed to the bed and connected with a crank shaft of a knife beam with an upper knife with a curved cutting edge, a transverse cutting unit in the form of a lower knife mounted on the bed and a holder with an upper knife with a rectilinear cutting edge associated with the drive crank shaft by means of a connecting rod, and both crank shafts are made with pins, the axes of which are perpendicular to the plane of longitudinal cutting, as well as the drive, characterized in that, in order to reduce the energy and metal consumption of the scissors, they are equipped with two links and two rods, each of the links is rigidly mounted at one end on the trunnion of the corresponding crank shaft, one of the rods is connected to the bed with one end, the other is pivotally connected to the knife beam, and the second rod is articulated with its ends with the free ends of these links.  2. Scissors according to claim 1, characterized in that, in order to increase durability and reduce the complexity of manufacturing the cutting edge of the upper longitudinal cutting knife, the cutting edge is made in the form of an arc of a circle with a constant radius.