SU1449222A1 - Forging tools - Google Patents

Abstract

The invention relates to the field of forging, primarily to the draft of the blanks. The purpose of the invention is to reduce strain and increase productivity. The upper and lower forks of the forging tool are equipped with at least three inserts made in the form of a set of plates, spring-loaded in the direction opposite to the flow of the metal during the draft. The axes of the plate sets in the plan are radial. In the center of the working surface of each hammer is installed a pyramidal rod and is equal to high with the plates. Plates in the set are made of different widths, more distant from the center has a greater width than the neighboring one, located closer to the center. Such a design of the tool allows one to reduce the influence of contact friction during the deformation of the workpiece, which leads to a decrease in the stress of deformation and an increase in productivity. 1 h. apt. 5 il.

Description

The invention relates to the processing of metals by pressure, in particular to devices for depositing blanks.

The purpose of the invention is to reduce strain and increase productivity.

FIG. I shows the instrument, front view, section; in fig. 2 - bottom firing pin, top view; in fig. 3 shows section A-A in FIG. 2 (fragment); in fig. 4 and 5 are the arrangements for the plate sets on the dies.

The forging tool contains upper and lower strikers 1, on the working surfaces of each of which inserts in the notches are installed in the form of sets of plates 2. The sets of plates 2 in an amount of not less than three are located around the rod 3, made equal in height with the plates 2 in sets and installed in the center of the working surface of each striker. The sets of plates 2 in the plan have a trapezoidal shape due to the fact that the plates are made with an increasing width of each plate compared to the adjacent one, located closer to the center. The axes of the sets of plates 2 are parallel to the working surfaces of the strikers and radially around the rod 3. The sets of plates 2 are spring-loaded in the direction to the rod 3, one example, the rods of power hydraulic or pneumatic cylinders 4 located in the cut-out walls of the strikers 1. To protect the sets of plates 2 from offset away from the radial direction, protrusions 5 are provided on the working surfaces of the strikers 1, to which the sets of plates 2 are pressed by springs 6 missed in the slots of the working surfaces. The rod 3 has the shape of a pyramid, the larger base of which faces the working surface of the striker. The working surface of each plate, which interacts with the workpiece 7, and the opposite supporting surface of the plate. interacting with the working surface of the striker, they have the shape of a cylinder with a radius equal to half the plate thickness. The plate thickness is constant, since the aforementioned cylindrical surfaces are connected by parallel planes.

The tool works as follows.

In the initial position, the sets of plates 2 are pressed against the lateral inclined upper-shaft rod 3 with the rods of pneumatic cylinders 4, i.e. the plates are inclined toward the center of the striker.

The workpiece 7 is placed between the set plates 2 of the strikers 1 and the tool travels, bringing the strikers 1 closer. In this case, the sets of plates 2 are inserted into the workpiece 7, deforming it, and their working surfaces interacting with the workpiece 7 are moved from the center of the work surface striker, carried away by the current metal. At the end of the compression sets of plates 2 occupy a fan-shaped position (Fig. 1, right

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va half drawing). It is recommended to stop the compression of the workpiece 7 when the gaps between the plates are equal to 0.6 ... 0.75 of the plate thickness, in order to avoid excessive waviness on the surface of the workpiece and jamming of the lower striker plates 1. In the squeeze window of the upper firing pin I lift, sets the plates 2 are returned to their initial position by the cylinder bars 4 and the next working stroke is made, repeat the cycle until the desired forging height is reached. If necessary, the edge workpiece 7 is sub-edged between the working strokes of the tool, turning it around the vertical axis, and also offset in the angle of the sets of plates 2, turning one of the strikers.

The wavy surface of the workpiece 7 is straightened with flat plates mounted on sets of plates or flat replaceable plates.

In order to increase the strength of the plates located closer to the center, they can be made common to adjacent sets, and most distant from the center, in order to avoid excessive tensile tangential stresses in the metal, blanks 7 - smaller ones (Fig. 5).

The proposed forging tool design reduces the stress of deformation during upsetting by reducing the effect of contact friction when separating the surface of the deformation zone to certain areas and increasing productivity by using at least three sets of plates 2 each striker, which allows you to affect the entire surface the ends of the upsetting workpiece 7.

Claims (2)

1. The blacksmith’s tool, mainly for sludge, containing upper and lower strikers with inserts mirrored in their notches, made in the form of sets of plates springed in the direction opposite to the flow of metal, the axes of which are arranged parallel to the working surfaces of the strikers, characterized in that , in order to reduce the stress of deformation and increase the productivity during the draft, each slaughter has at least three sets of plates fitted with its side surfaces, the axes of which are olozheny ra- dially around rod made with plates of equal height and mounted in the center of each pin, and the plates in each set are made of different width, of increasing as the distance from the striker plate center. 2. The tool according to claim 1, characterized in that the axes of the pdastin sets of one die are offset relative to the axes of the sets of plates of the other die. FIG L FIG. AFChG FI.5