SU526459A1 - The device for cutting sheet material in a spiral of Archimedes - Google Patents

Description

ki tangent to the helix in the position coinciding with the direction of cutting. This is their fault.

Scissors are also known in which there is a device that provides periodic periodic adjustment of the position of the center of rotation of the workpiece. This device consists of a pressure sensor mounted on a hinge, connecting scissors and a device for circular and figure cutting, a hydraulic system, and a hydraulic actuator, such as a hydraulic cylinder. For cutting on these scissors, the workpiece is set against the stops and clamped by the rotary disks of the work centering unit. At the beginning of the cutting, the coincidence of the cutting direction and the tangent to the Archimedes spiral is ensured by turning the circular and figure cutting devices along with the centering unit of the workpiece around a vertical axis passing through the cutting point (the point of contact of the blade disks) at an angle ccir,

p - QD a, j - and j, j,

where ai is the angle between the radius-vector and the tangent to the spiral at the starting point of the spiral.

During the cutting process, the billet with the force of tapps between it and the cutting discs is rotated around the axis of the rotary discs. The turning of the rotary discs is transferred to the nut, as a result of which the carriage, with the centering and workpiece, moves along the frame to the cutting point. As the workpiece rotates, the angle between the radius vector and the tangent g)) changes. Its angle remains unchanged. A cutting force component arises, directed along the line connecting the center of rotation of the workpiece to the cutting point. A signal is generated at the pressure transducer, which turns on the drive for turning the circular cutter towards reducing the harmful forces in the shear mechanisms. As a result of moving the center of rotation of the workpiece along a certain path, the Archimedes spiral is cut more accurately.

However, such a circular knife: the nannies have a complex follow-up device. Due to the periodicity of the follow-up device, the coil is not sufficiently smooth.

The purpose of the invention is to simplify the design, to increase the reliability and durability of the device for cutting sheet material in an Archimedes spiral, to improve the quality of the parts cut.

This is achieved by the fact that in the proposed scissors the complex tracking device is replaced by a simple mechanism, for example a screw one. A new mechanism for cutting sheet material in an Archimedean spiral is designed to displace the stand of the device for circular and figure cutting with a carriage, centering unit and workpiece from the longitudinal plane of symmetry of the device by a given value e corresponding to the geometric characteristics of the spiral in a given direction.

FIG. 1 shows the proposed device, side view; in fig. 2 - the same, top view.

The device for cutting sheet material in an Archimedes spiral contains a welded base 1 of disc shears. The upper and lower blade discs are driven by the drive 2 via gears and drive shafts. The head 3 of the upper disc moves in the vertical direction.

electric motor 4. The shafts of the blade discs are inclined at an angle of 45 °. To improve the cutting conditions, the top head has a vertical axis of rotation 5. Slider 6 for circular and shape cutting

moves along the stat 7 with screw 8 from the actuator 9. The lower rotary disk 10 with cylindrical and conical gear pairs is connected to the nut 11. The kinematic chain from the rotary disk to the nut can be

separated by a cam sleeve 12. The disk knives with the device for circular and figure cutting are connected by a rod 13 passing through the lugs 14 of the frame 1 of the circular scissors and the lug 15 of the device

for circular and shape cutting. The eyelet 15 along the dovetail-type guide in the bed 7 is moved by a screw 16. The second end of the bed 7 is rotated around an axis with the help of a hydraulic or pneumatic drive.

rod 13.

The upper rotary disk 18 with the help of the mechanism 19 presses the workpiece to the lower disk 10. The bed 7 during the movement slides on the supports 20 and 21. Screw 16

can be positioned so that its axis crosses the axis of the rod 13. In this way, the eyelet 15 will be made integral with the bed 7. The ears 14 can be made movable. In this case, the screw supports 16 are placed in the frame 1 of the disc shears, and the rod 13 will begin to move with bed 7.

The device for cutting sheet material of the Archimedes spiral works as follows.

The blank for cutting out the side sheet of the fan casing is clamped between the rotary disks 10 and 18 of the carriage 6. By turning on the drive 9, the carriage 6 with the workpiece is guided to the cutting disks. With the drive 17 and the screw 16, the bed 7 of the device for the circular and figured cutting means is shifted by a predetermined distance corresponding to the step of the cut-out spiral of Archimedes. Include drive 2 cutting discs. Lower the upper knife DTSK. A pulling force of friction arises between the workpiece and the disks, which rotates the workpiece around the axis of the rotary disks. The rotation of the rotary disks is transmitted to the nut 11. The pre-carriage moves to the cutting disks.

proportional to the angle of rotation of the workpiece. As a result of the simultaneous rotation and movement of the workpiece, it is cut in a spiral of Archimedes.

Claims (1)

Invention Formula A device for cutting sheet material in an Archimedes spiral, containing circular shears with inclined knives and a circular and figure cutting device pivotally connected to them, including a stapine, a carriage with a centering and clamping unit of the workpiece, and an actuator, characterized in that, in order to increase the accuracy of the cut parts, simplify the design and increase the reliability of the shear mechanisms, the base of the circular and figure cutting apparatus is provided with perpendicular with respect to its longitudinal axes guides, made in the shape of a dovetail, and a mechanism, for example a screw, for displacing the frame of the device for circular and figure cutting by the said guides to disc shears. Sources of information taken into account in the examination. 1. Auth. St. No. 398361, cl. In 23D 19/00, 1973.