SU361104A1 - SCREW PRESS MOLOT - Google Patents

Description

one

The invention relates to the field of metal forming and is intended for use in mechanical engineering and other areas of engineering.

A screw press hammer is known which contains a hydraulically-driven slider mounted in the frame guides and a running nut with a flywheel rigidly fixed in the upper cross-member of the frame and connected by means of a sub-slider to the slider.

The hammer press differs from what is known in order to increase the reliability and durability of the work, it is equipped with an annular holder rigidly fixed on the surface of the upper cross member along the axis of the press hammer, as well as a floating nut placed on the flywheel inside it, on the outer surface of which longitudinal slit protrusions included in the slotted grooves provided on the inner surface of the holder. In order to provide the possibility of adjusting the position of the floating nut, the screw press hammer is equipped with interchangeable straps installed on the screw-flywheel between the running and floating nuts.

FIG. 1 shows the design of a screw press hammer, a general view with a partial cut; in fig. 2 shows the design of the suspension nut (assembly L in FIG. 1) and the arrangement

inter-turn clearance during acceleration down; in fig. 3 - the same, in the period of working stroke and return stroke upwards.

The screw press hammer includes a closed power frame 1 in the form of a frame of any known construction, in which the travel 2 and floating 5 nuts, screwed with the flywheel 4, are located. mounted in the frame of the press hammer motionless, the floating nut can vertically move along the slits 7 (Fig. 1-3) of the holder 8 and in the lower position abuts the gasket 9. The moving parts of the press hammer are driven from the hydraulic cylinders 10 (shown ko one). The press hammer is attached to the foundation with support plates 1.

Upper, floating nut provides only acceleration of moving parts, and lower, running nut perceives the working force of the deformation of the workpiece and provides a return stroke. Both nuts 2, 3 and 3 can be moved relative to each other by the force of the press hammer.

This design will allow to exclude the transfer of work effort to the floating nut and reduce to a minimum the overrun in the thread.

Works screw press hammer as follows. In the initial position, the movable parts of the press hammer are in the upper position, the rod end of the cylinders 10 are connected to a pump (not shown), and the piston cavities are connected to a drain.

For the acceleration stroke, the rod end of the cylinders 10 are connected to the drain and the piston cavities to the pump. Under the pressure of the fluid, the floating nut is pressed against the gasket 9. The screw flywheel and the slider 6 begin to accelerate rapidly, accumulating the kinetic energy of the screw and translational motion necessary to deform the workpiece.

The thread size of the spindle nut can be chosen so that during acceleration, when the screw-flywheel slides along the turns of the floating nut, there is a gap between the threads of the screw of the flywheel and the spindle nut (Fig. 2).

During the course of deformation of the workpiece (Fig. 3), when the screw-flywheel perceives large working forces, there is an overrun of gaps in the thread of the screw pair. This leads to the fact that the floating nut pops up (by keys or splines) and allows the turns of the screw to rest on the turns of the thread of the running nut and absorb the working forces of the forging. This design makes it possible to manufacture nuts 2 and 3 of one-sided operation (which considerably simplifies and reduces the cost of their manufacture and improves the reliability of the screw mechanism), creates conditions for the hydrodynamic BITKOV lubricant in the thread, greatly simplifies the operation of the screw machine, compensating for the axial clearance resulting from wear and tear, the axial clearance in the joint .

To make a return stroke, the piston cavities of the cylinders are connected to the drain, and the piston cavities are connected to the pump. The screw flywheel, moving along the turn nut turn, rises together with the slider 6.

The screw press hammer can work in the modes of a press hammer, hammer and press.

The invention is not limited to the example described above, other variants of the design that are not beyond the scope of the invention may also be provided.

Subject invention

Claims (2)

1. A screw press hammer containing a hydraulically-actuated slider mounted in the frame frames and a running nut with a screwdriver fixed in the top cross-member of the frame, connected by means of a slider to the slider, in order to increase reliability and durability work, it is provided with an annular holder rigidly fixed on the surface of the upper cross-member along the axis of the press hammer, as well as a floating nut placed on the flywheel inside it, on the outer surface of which there are longitudinal splined protrusions provided on the inner surface holder. 2. The screw press hammer according to claim 1, characterized in that, in order to enable the positioning of the floating nut to be adjusted, it is provided with interchangeable gaskets in the screw-flywheel between the suspension and floating nuts. FIG I Fig 2  A bariat 7 3