SU470369A1 - Stamp for cutting bar material - Google Patents

Description

i

This invention relates to the field of metal forming.

Known stamps for cutting bar material containing movable and fixed plates, as well as a bar clamping mechanism equipped with a cutting tool.

However, the known stamps exclude the possibility of using automatic bar feeders and, moreover, are unreliable in operation.

To improve the performance and reliability of the proposed stamp, the bar clamping mechanism is designed as a fixed block, the casing of which is mounted on the bottom plate and has cutouts with guide bars on which a slider is mounted with a clamping semi-ring fixed on it, which forms another semiring that is identical to it, fixed in the housing, the cutting unit, and also in the form of a movable unit installed inside the housing, consisting of a spindle bearing on the springs, carrying the clamping half ring and entering aplechikami formed in the fixed block housing grooves, a spring-loaded relative to the rocker crosshead equipped with a second clamping semicircle, forming a semicircle with said second cutting unit and the associated passing through the connecting rods to traverse

2

a lever resting on it interacting with a cam fixed in the upper plate interacting on a slider of a fixed block.

FIG. 1 shows the proposed stamp, longitudinal section; in fig. 2 - the same, section along AA.

On the bottom plate 1 of the stamp, a body 2 is installed, in the recesses of which between the guides (not shown) the clamping slider 3 moves with a clamping half ring 4. In the lower part of the housing 2, the second half ring 5 is fixed. Both half rings form a nerve cutting block.

In the rectangular cut-out of the housing 2, a movable unit is mounted on the springs 6, consisting of the yoke 7, the yoke 8, spring-loaded with respect to the yoke 7 by the springs 9, the gi 10 and the levers I. In the yoke 7

a semi-ring 12 is fixed (see Fig. 2), and in the yoke 8 a movable clamping semi-ring 13. The upper part of the stamp consists of the top plate 14 and the cam 15 attached to it. The stamp works as follows.

In the upper position of the press slide, the axes of the movable and fixed blocks coincide due to the fact that the movable block is spring-loaded. The bar is fed into the working hole of the punch, and its free movement is ensured by the fact that under the action of the springs 9 there are gaps between the half rings.

When the press ram moves downwards, the cam 15 rotates around its axis and moves the movable block, exerting pressure on the levers I, while through the pulls 10 the force is transferred to the rocker arm 8, thereby clamping the cut piece. The clamping force is equal to the cutting force. At the same time, the reaction occurring during the cutting is equal to the magnitude of the cutting force, through the cam 15 it acts on the slider 3, as a result of which the bar is clamped. When the slide is upward, all the levers are unloaded, the yoke 7 under the action of the springs 6 returns to its original position, and between the half rings under the action of the springs 9 a gap is again formed, which is necessary for the free pushing of the bar and the cut of the blank.

Subject invention

A stamp for cutting bar material containing movable and fixed plates, as well as a bar clamping mechanism equipped with a cutting tool, characterized in that, in order to increase productivity and reliability of operation, the bar clamping mechanism is made in the form of a fixed block, the casing of which is mounted on the bottom plate It has cutouts with guide rails on which a slider with a clamping half ring fixed on it is installed, forming with the other half ring identical to it fixed in the housing, the cutting unit, as well as in the form of a movable block installed inside the body consisting of a spreader bar supported on the springs, carrying the clamping half ring and entering with its shoulders into the grooves formed in the fixed block case, spring-loaded relative to the cross arm of the rocker arm, equipped with the second clamping half ring, which forms the second cutting block with the said half ring and the connecting rods passing through the yoke with the lever resting on it interacting with the cam fixed in the upper plate acting on the motionless slider block.

eleven

t

15

FIG. 2