SU1207660A1 - Shears for cutting movable billets - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to scissors for cutting moving blanks.

The aim of the invention is to improve the quality of the cut and reduce the metal intensity of the scissors.

Fig. 1 shows a kinematic diagram of shears for cutting moving blanks; Fig. 2 - the same at the moment of the start of cutting; Fig. 3 is the same at the time of the end of the cutting.

The shears for cutting moving blanks contain a bed frame 1 parallelogram mechanism 2, the rocker arm 3 of which is connected to the bed frame 1 directly, and the rocker arm 4 is connected with an eccentric shaft 5, which is made on the eccentric shaft 6. The support 8 is rigidly fixed on the pair 7 of the parallelogram mechanism 2 carrying knife 9 and guides 10 in which slider 11 with second knife 12 is installed, Slider 11 through connecting rod 13 is connected to crank 14 of crank shaft 15, Crank shaft 15 is mounted in support 8 and connected through spindle 16 to drive 17 of its rotation . In addition, the crank shaft 15 is connected to the eccentric shaft 6 via an additional crank mechanism, including the crank 18 and the connecting rod 19, which is connected to the additional eccentric 20 of the eccentric shaft 6.

To ensure the certainty of the initial position of the scissors with the eccentric 20, the counterweight 21J is rigidly connected. A shock absorber 22 is installed on the frame 1. The extreme position of the shears after the cut is limited by a rigid stop 23 fixed to the frame 1.

Scissors for cutting moving blanks work as follows.

In the initial position, before cranking the crank 14, the crank shaft 15 takes the lowest position, the crank shaft 15 is braked, which is 07660

the ryumislo 3 rests on the shock absorber 22, the solution between the scissors 9 and 12 is maximum, the workpiece 24 passes freely between them,

5 When applying the cut command, the crank shaft 15 is braked and with the aid of the actuator 17 is turned in the direction of the arrow с.

The movement from the crank shaft 15

10 is transmitted to the slider 11 with the knife 12, as well as to the eccentric shaft 6. From the eccentric shaft 6 through the eccentric 5, the movement is transmitted to the beam 4 and then to the mat 7

15 parallelogram mechanism 2.

The ratio of the links is chosen such that after rotation of the crank shaft 15 by approximately 90, the eccentric 5 and the crank 18 are close to the dead position, and the knives 9 and 12 simultaneously come into contact with the workpiece 24 (Fig. 2). With a further turn

25 of the crank shaft 15 (90-180, counted from the initial position), the pair 7 and the support 8 fixed on it with the upper knife 9 are moved horizontally. At this time

30, a slider 11 with a knife 12 rises upward to complete cutting of the blank 24 (FIG. 3).

With further rotation of the crank shaft 15 from 180 to 360

goes the lowering of the slider 11 with the bottom

the knife 12 and the lifting of the sparnik 7 with the caliper 8 fixed on it, which does not have the upper knife 9. After the knives 9 and 12 come out of contact with the thin 24 under the action of the counterweight 21 fixed on the eccentric 20, the scissors return to their initial position before the rocker arms touch 3 with a shock absorber 22. The actuator 17 is switched off with simultaneous braking of the crank shaft 15,

The use of the proposed scissors makes it possible to improve the quality of

cutter and reduce metal content.

Metal

figure 1

method

-3

12 / W

-21

Metal

lli

Editor T. Parfenova

Compiled by V. Sviridenko

Tehred A. Babinets Proofreader A. Tsko

125/13

Circulation 1000 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PSh1 Patent, Uzhgorod, st. Project, 4

(rig. 3

Claims (1)

SCISSORS FOR CUTTING MOVING PREPARATIONS, containing a parallelogram mechanism connected to the bed, one of the rocker arms of which is connected to the eccentric shaft, and a support is mounted on its coupler bearing one of the knives and guides in which a slider with a second knife is mounted connected to the crank. a shaft kinematically connected with the drive of its rotation and with an eccentric shaft, characterized in that, in order to improve the quality of cut and reduce metal consumption, the eccentric shaft is equipped with an additional exce trick, the crank shaft is mounted in a support and a kinematic link between the crank and the eccentric shaft is formed as a supplementary crank mechanism, which connecting rod is connected to a further eccentric.