SU848114A1 - Extruding press - Google Patents

Description

I The invention relates to the processing of materials by pressure and can be used in the manufacture of products of periodic and variable sections by extrusion. A press is known for making articles by extruding a material of a blank placed in a container through a matrix consisting of a back beam, including a main power drive mounted on it, a reverse drive, a press die, and a front beam of the plate on which the mechanism is located. closure with shutter supported on a matrix holder, container, container holder. Zaodn and anterior traverse of the plate are fastened, for example, by rigid columns or a monolithic bed. In addition, presses are equipped with power drives for re-shifting and clamping the container llj. It is also known to manufacture products of periodic and variable sections using dies with moving parts. In the process of pressing moving parts using a special power drive installed th. in the press, they move in the radial direction, thereby changing the cross-sectional area of the matrix point 2j. The disadvantage of this device is the need to have an additional power drive on the press, as well as its relative low capacity due to the lack of space on the press to accommodate a powerful power drive. Therefore, the device has limited application and is mainly used for producing profiles with small section tips. A device for pressing variable cross-section profiles is known, in which the radial movement of the moving parts of the dies is carried out with the help of a copier connected to the press stamp of the press Gz}. However, the device has a limited gradient of radial movement of moving parts, as well as rapid wear of the copier due to high pressures. Therefore, its use is limited to the production of small variable section profiles of light alloys. Thus, the production of products of periodic and variable sections is limited to a small range of profiles from easily deformable metals, due to the small radal pressures on the moving parts of the matrices created by known devices. .

In addition, prior art devices do not allow the production of articles with periodically repeated transverse ribs, etc.

The purpose of the invention is to expand the range of compressible articles of periodic and variable cross sections by increasing the radial pressure on the movable parts of the dies.

The goal is achieved by the fact that in a press containing cross-braced crossheads, of which the main actuator is mounted on the rear with a press stamp and the return drive, and on the front closure mechanism with a gate, the matrix holder with the dies has parts with a matrix holder, a container with a drive for its movement, a mechanism for moving the movable parts of the dies is made in the form of drivers that pivotally connect the parts of the dies with the front beam plate, and the matrix holder is mounted with possible axial movement.

FIG. Figure 1 shows a press and its front assembly with an instrumental setup for the manufacture of products with repeating transverse ribs, a general view; in fig. 2-6 show the sequence of press operation for such products; in fig. 7 is a diagram of the work of the Press in the manufacture of products of periodic and variable sections.

The press contains the back plate 1, the main power actuator 2 with backward movement placed on it, the press-stamp 3, which are fastened to the crosshead 6 by folding columns 4 and special nuts 5, on which the support ring 7 is placed, closing mechanisms 8, locks 9.

A central hole is made in the front plate into which the matrix holder 10 is installed, supported on the gates 9, containing the previous matrix with movable parts 11, locking the wedge 12, the mechanism 13 for raising and lowering the movable parts of the previous matrix, gasket 14, after the extension matrix with movable parts 15. The drivers 16 are hinged by means of the axles 17 and connected to the movable parts 15, and by means of the axles 18 with the front plate. The matrix holder is connected to the container 19, for example, by clamping wedges (not shown). The container is installed in the container holder 20. The power drives 21 are fixed on the front plate and the container holder, providing axial movement, the container with the matrix holder and their

pressing against the valves 9 or the support ring 7.

The front press assembly is made in the form of a mechanism in which the movable parts 15 are hingedly connected by the drivers 16 to the front plate, and the matrix holder is arranged to oceBCj in the guide hole made in this plate.

The press works as follows.

The actuators 21 of the matrix holder 10 with the container 19 are pressed against the closures 9. The movable parts 11 rest on the locking wedges 12, the movable parts 15 are separated and locked with leads 16. The cross section of the previous matrix point with its movable parts 11 is equidistant to the cross section of the next matrix point with its movable parts 15 mi, but a little more.

Stop the movement of the press stamp 3 (Fig. 3). By means of mechanisms 8, the valves 9 are separated with amykani, releasing the matrix holder from the support. They give pressure to the power cylinders on the pressure of the container. In this case, the support holder deprived of support with the container begins an axial movement in the direction of flow. The die holder moves in the guide hole of the plate. The drivers 16 turn and press the movable parts 15 into the workpiece, the shape of which is a transverse edge.

The matrix holder abuts against the support ring 7 (Fig. 4).

The movable parts 15 are collapsed and occupy a working position. The pressure in the cylinders 21 is relieved. The locking wedges 12 are withdrawn to the sides from the retainer, releasing the moving parts 11, which are then removed by the mechanisms 13 from contact with the workpiece. Pressure is applied to the press-stamp and extruded through the next matrix with moving parts 15 the next section of the product is slightly smaller in cross section than the previous one.

Then, the pressure is relieved of the ram and reversed, and at the same time pressure is applied to the power cylinders 21 at the extraction of the container and die holder. The die holder is moved in the guide hole of the plate, the leads 16 are rotated and the moving parts 15 are pulled out of contact with the product. At the same time, the movable parts 11 and the shutters 9 are reduced.

The closures 9 and the movable parts 11, which with the pressed section of the product have the necessary clearance, since the cross-section of the point of the previous matrix is made somewhat better than the subsequent matrix, is set to the working position. Set the locking wedge 12, push the stamp 3 to the movable parts 11 of the workpiece and opress it. Then

further extrusion or molding the next edge.

In this way, all products 23 are made successively with transverse ribs and areas between them of different lengths.

In the manufacture of products of periodic and variable sections (Fig. 7), the closures are made, for example, wedge-shaped. Shifting or pushing them up ensures the movement of the matrix holder in the guide hole of the plate and the rotation of the leads that push or move the moving parts of the matrix, thereby changing the cross-section of the point of the matrix.

The proposed press creates considerably greater radial pressure on the moving parts of the dies than the pressure developed by the power drives of the container movement, as well as by known devices. This makes it possible to process more difficult-to-deform materials on the press, as well as to produce a wider product range, including products with transverse ribs such as tiled panels, beams, and profiles with ribs, etc. In addition, the simplicity of the design provides a relatively quick conversion with minimal cost of existing presses of various designs for the production of the necessary products of periodic and variable sections.

Claims (3)

1.Zholobov V.V. and others. Metal pressing. Metallurgists, 1971. 2. Matveev, B.I. et al. Technologists of the pressing of profiles of variable and periodic section of light alloys. Oborongiz, 1959, FIG. 57. 3. Authors certificate of the USSR 80834, cl. B 21 C 23/21, 1953. S jf 21 Have 15 FIG. 7