SU757269A1 - Drum-type flying shears - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to cutting equipment, and can be used in industry for cutting continuously moving material.

A device comprising a pair of cutting rollers in the tapered slots ⁵ koto- ryh movably mounted knives along the axis of the cones in the form of flat wedges. On the signal of the rev counter, elements moving the knives to the cutting position are pushed out of the body. There are u devices that return the knives to the skipping cut position [1].

This design eliminates the influence of the instability of the knife-on time, since there is a rigid kinematic connection. The conical shape of the cutting rollers ¹⁵ provides a smooth adjustment of the length of the cut rod within one revolution due to the movement of the processed rod along the forming cones. 20

A disadvantage of the known device is the lack of rigid fixation of the knives during the cutting process, which leads to a decrease in the reliability of the device. If the angle is about 2

taper of the cutting head is greater than the friction angle, then the cutting force causes a load on the element that extends the knife and can even move the knife, overcoming the resistance of this element. Bolts in contact with the side edges of the knife, only regulate the gap between the knife and the cutting head. This gap is necessary to ensure the movement of the knife, it also leads to distortions of the knife and local stresses accelerating the damage of knives and cutting heads.

Known drum flying shears, containing a frame of the drum, mounted on the shafts and carrying knives placed in its grooves with the possibility of radial movement through the mechanism skip cut [2].

Scissors do not also have a rigid fixation of the knives in the process of cutting, which leads to a decrease in reliability.

In order to increase the reliability, the cut skip mechanism is made in the form of a self-braking wedge interacting with a knife base made of a wedge, clamps in the form of non-braking wedges located on both sides of the frame knife,

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installed with the possibility of moving along the drum and elastic elements connecting the self-braking wedge and clamps with the frame, and the elastic elements of the clamps have greater force, the clamps can be made in the form of successive wedges and elastic elements between them.

FIG. 1-3 depicts scissors in three projections with sections A-A and BB; in fig. 4 shows a section B-B. FIG. one.

Drum flying shears have a frame 1, in which on bearings 2 are placed shafts 3 with drums 4, in the grooves of which knives 5 are installed with the possibility of radial movement by means of cut-through mechanisms. The knives have a wedge base 6 and flat edges 7.

The cut skip mechanism is made in the form of a self-braking wedge 8 interacting with a wedge base 6, retainers 9 in the form of non-braking wedges placed on both sides 7, a frame 10 mounted to move along the shaft 3 and elastic elements 11, 12 connecting the self-braking wedge 8 and clamps 9 with a frame 10. The force of elements 12 is greater than elements 11. The movement of the wedge 8 is limited by an adjustable stop 13. The drive frames 10 of both reels are blocked by self-braking wedges 8, have springs 14 in the form of springs, and otormozyaschiesya wedges 9 - uzly'vozvrata 15 provided also in the form of springs, the blades 5 are returning to their original position by the spring 16, the clips are designed as successive wedges disposed with elastic elements 17 therebetween. Elastic elements (springs) 17 provide uniform loading wedges 9.

Drums may not only be cylindrical, but also knives may have a more complex shape. For knives, working on the cut, there will be an asymmetric installation of the elements, but the principle of their work will not change. It is most efficient to carry out knives with replaceable cutting bodies so that when changing knives it is not required to re-manufacture the entire body. This will allow, if necessary, in the form of successive sets and self-braking wedges pushing knives. The knives can be returned not only by spring devices, but also by self-braking wedges having dovetail grooves or the like. With great flexibility of the cut blanks, only one drum can be equipped with a cut-skip mechanism, the knife on the other drum will be firmly installed. On elongated cylindrical heads it is possible to simultaneously cut several rods into segments of the same length.

Scissors work as follows.

Drum 4 constantly rotates during operation from the drive (in the drawing it is not 4).

cauldron), hire 18 passes calab 19 drums. The signal of the measuring device (not shown) activates the drive (electromagnet, or hydraulic cylinder or other device) of the frame 10, which begins to move synchronously in the longitudinal grooves of both drums 4. The frames 10 through the elastic elements 11 act on the wedges 8. At the moment when the knives 5 are advanced to the cutting position of the rolled 18, the wedges 8 abut against the stops 13, the position of which is adjusted in advance and they are fixed in this position. The knives 5 are pressed against the wedges and are kept from further movement under the action of centrifugal force by the return springs 16.

After stopping the wedges 8 and the knives 5 of the frame 10 continue to move, compressing the elastic elements 11 and through the elastic elements 12 act on the wedges 9. The wedges 9 leaning on the inclined inner surfaces of the drums 4 are shifted in the transverse direction under the influence of the reactions of the bodies and wedged the knives 5, ensuring freedom slight transverse shear of wedges 9. Without elastic elements 12, due to inaccurate manufacturing (within tolerances) of the drums 4 of the knives 5 and wedges 9, shifts or distortions of the knives may occur, and if there are grooves, This turns the lateral shift of the knives will be unilateral seizure of the latter.

The knives 5 move to the cutting position and jam on the last turn of the drums 4 before the cut. During the cut, the knives 5 transfer the load to the self-braking wedges 8 that act on the drum 4 and do not transfer the load to the frames 10. After performing the cut in less than one turnover of the drums 4, the knives are retracted to the skip cut position. This happens as follows. The frames 10 are retracted by their drives. Nodes 15 return non-braking wedges free side edges of the knives 5. Nodes 14 return self-braking wedges 8 brings them back, which can be done because this time the knives are not loaded with cutting force. As the wedges 8 are moving away, the knives 5 by means of the spring of their return 16 are removed, setting to the skip cut position.

In addition to achieving the main goal, scissors provide the best compactness. This, in turn, increases their rigidity and improves operating conditions, increases durability and precision of the segments. By ensuring smooth and precise adjustment of the speed of rotation of the drums, the accuracy of cutting blanks in length increases.

Claims (2)

Claim 1. Drum flying shears containing a frame, drums mounted on shaft and bearing knives placed in his 757269 grooves are radially movable by means of mechanisms of cutting passes, characterized in that, in order to improve reliability, each mechanism skip cut made as a self-locking wedge interacting with the blade base made wedge, fiksato- ⁵ nesamotormozyaschihsya moat in the form of wedges arranged on both the edges of the knife, the frame mounted for movement along the drum and elastic elements connecting the self-braking wedge and clamps with a frame, and the elastic elements of the clamps have a greater force. 2. Drum flying shears on π. 1, characterized in that the latches are made in the form of successive wedges and elastic elements between them.