JPS6150719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wedge press in which a reciprocatingly slidable wedge body engaged with a driving device is subjected to reciprocating motion by a press die disposed offset from the center. the wedge body has a common pressure-receiving contact surface with the ram on one side and a common pressure-receiving contact surface with the press frame on the opposite side of this contact surface. Relates to a type of contact surface.

Wedge presses of this type are used, for example, as forging presses or percussion presses and are currently used primarily for deforming metals.
The wedge is moved using a large and low crank or a piston and cylinder arrangement or a flywheel and spindle arrangement. Usually, the wedge body is arranged above the ram, but in the case of a ram that can move up and down, the wedge body can be arranged below the ram, or the wedge body and the ram can be arranged next to each other. In this case, the ram reciprocates horizontally.
In the case of hitherto known wedge presses of the type mentioned at the outset, the pressure-receiving contact surfaces between the wedge body and the press frame or between the wedge body and the ram extend as a flat surface, and the wedge body and the ram are flat. Lateral guide members are provided between the press frame and the press frame.

If the wedge moves the ram forward to deform the material in the press die, and the press die is positioned offset from the center relative to the ram, the ram will tilt and this will further The wedge body begins to lean. This tilting of the ram, and therefore the wedge body, can be seen in the periodical magazine "Industrie-Anzeiger", Vol. 91, No. 30, 686.
From page 688, in particular from page 686 on the left, it is known and is furthermore blocked, for example, by lateral guide elements of the wedge body. Generally, in a wedge press, the wedge body rotates around an axis parallel to its slope, and around an axis extending in the direction of movement of the ram;
A displacement in a direction perpendicular to the direction of movement of the ram and the direction of desired wedge sliding must be prevented. SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a device that is as simple as possible for preventing the wedge body from pivoting, shifting and tilting.

According to the invention, this object is achieved in that at least the pressure-receiving contact surface between the press frame and the wedge body forms at least one cavity extending in the sliding direction of the wedge body and having a chevron-shaped or trough-shaped cross section. This problem was solved in that the cross section of the cavity was tapered in the direction of movement of the ram.

By designing the contact surfaces as chevron-shaped or trough-shaped as described above, even the slightest undesired pivoting and displacement of the wedge body is prevented. This is because the pressing force forces the wedge body directly between the two mutually inclined side walls of the cavity.

In the case of the wedge press according to the invention, there is no play between the wedge body and the press frame, so that lateral guides of the wedge body in the press frame can be omitted, which reduces assembly costs. is reduced, which simplifies the production of the wedge body.

In one embodiment of the wedge press according to the invention, the contact surface is provided with only one chevron-shaped or trough-shaped cavity, the cross-section of which extends over or approximately the entire width of the wedge body. It extends over. However, it is also possible to provide a number of recesses, preferably two recesses, one next to the other, covering the width of the wedge body. The cross section of the cavity may be triangular or semicircular, for example. A cavity can also be provided at the interface between the ram and the wedge body. This cavity can also be provided in the wedge or in the press frame or ram.

When only one cavity is provided, the desired effect can be sufficiently obtained even though the manufacturing cost is small. If the cavity extends over the entire width of the wedge body, the contact surface that receives the pressure will not have a portion that extends horizontally, that is, perpendicularly to the direction of movement of the ram, resulting in a manufacturing technical problem. Not only are the advantages brought about, but any play between the wedge and the press frame or between the wedge and the ram is also eliminated.

If the cross-section of the cavity is triangular, it is not only advantageous in terms of manufacturing technology, but also the undesired movements of the wedge body are very well prevented and play is completely eliminated in the area of the contact surfaces. Also useful.

The desired effect becomes better as the maximum depth of the cavity increases. The maximum depth of the cavity is one third of the maximum width of the cavity formed by the contact surfaces.
It is advantageous if the value is chosen to be equal to or larger than . If the cross section of the cavity is partially circular, the depth of the cavity may not exceed half the width of the cavity. If the cross-section of the cavity is triangular, an internal angle of 90 degrees is advantageous in order to sufficiently prevent undesired movements of the wedge, but it is necessary to obtain satisfactory conditions in terms of manufacturing technology. If you do, you can create a 100 degree internal angle in the cavity.

The invention will now be explained with reference to the illustrated embodiment.

According to FIG. 1, a support 1 is provided which is designed as a stationary anvil and which in turn belongs to a press frame 2. At a distance from the vertically extending central axis 3, i.e. offset from the center, there is provided a press mold 4 consisting of two parts, one part of which is connected to the support base 1.
The upper and other part is fixed to a ram 5 which reciprocates in the direction of the arrow 6. On the side opposite the press mold 4, the ram 5 is connected via a lateral guide 7 to a wedge 8. Furthermore, wedge body 8
For this purpose, a support member 14 is provided in case a mass balance cylinder acting on the ram 5 is not provided. The support member 14 is the ram 5,
The wedge body 8 works effectively when it receives the weight of the tool and when there is resistance to returning the ram 5 back into the tool. The wedge body 8 is connected along a horizontal guide member 7 to a spindle 9 of an obliquely arranged flywheel-spindle arrangement (not shown in detail), which spindle 9 engages the wedge body 8 centrally. are doing. The ram 5 and the wedge 8 are in contact with each other at a pressure-receiving flat contact surface 10, which in this embodiment extends perpendicularly to the central axis 3 in all directions. A frame portion 11 of the press frame 2 is provided on the opposite side of the wedge body 8 from the ram 5.
This frame part 11 is in sliding contact with the wedge body 8. The wedge press is otherwise constructed like the wedge press according to German Patent Application No. 2007505, in which the height of the wedge body 8 is in the sliding direction, ie in the first
It varies in a direction extending perpendicular to the drawing plane of the figure.

In the sliding direction, a cavity 12 extends, which cavity 12 is arranged in the frame part 11 and forms a contact surface 13 for receiving the pressure between the frame part 11 and the wedge body 8. The area of the wedge 8 facing the frame part 11 is designed in such a way that it can be fitted into the cavity 12. The cross section of the cavity 12 is symmetrical with respect to the central axis 3. That is, the contact surface portion located to the left of the central axis 3 is mirror-symmetrical to the contact surface portion located to the right of the central axis 3.

In the case of FIG. 1, as in FIG. 2, the cross section of the cavity 12 is triangular, and a single cavity 12 into which the wedge body 8 extends is provided only in the press frame 2. In the case of FIG. 3, in a variant of FIG. 2, a single recess 12 with a triangular cross section is provided in the wedge body 8, into which the ram 5 enters. Fourth
According to the figure, there is a single cavity 12 with a triangular cross section into which the press frame 2 penetrates only into the wedge body 8.
is provided. In the case of FIG. 5, in a variant of FIG. 4, a single triangular cavity 12 is also provided in the ram 5, into which the wedge body 8 enters. FIG. 6 shows a press frame 2 with a single cavity 12 of semicircular cross section, into which a wedge 8 projects. In the case of FIG. 7, in a variant of FIG. 6, a single recess 12 with a semicircular cross section is provided in the wedge body 8, into which the ram 5 enters. According to FIG. 8, two cavities 12 having a triangular cross section are provided side by side in the press frame 2, and a wedge body 8 is fitted into the cavities 12. The case shown in Fig. 9 is a variation of the one shown in Fig. 8, in which the two chambers have a semicircular cross section.

[Brief explanation of the drawing]

The drawings show a plurality of embodiments of the present invention, in which FIG. 1 is a sectional view of a wedge press according to the present invention, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG.
7, 8 and 9 are cross-sectional views of a wedge press according to the invention with differently formed cavities in the pressure-receiving contact surfaces. 1... Support stand, 2... Press frame, 3...
Center axis line, 4...Press mold, 5...Ram, 6...
Arrow indicating the direction of movement of the ram, 7... Guide member, 8
... Wedge body, 9 ... Spindle, 10 ... Contact surface, 11 ... Frame part, 12 ... Hole, 1
3...Contact surface, 14...Support member.

Claims (1)

[Claims] 1. A wedge press, in which a reciprocating wedge engaged by a drive acts on a reciprocating ram loaded by a press die arranged offset from the center; A type in which the wedge body forms a common pressure-receiving contact surface with the ram on one side and a common pressure-receiving contact surface with the press frame on the opposite side. in which at least the pressure-receiving contact surface 13 between the press frame 2 and the wedge body 8 forms at least one cavity extending in the sliding direction of the wedge body and having a chevron-shaped or trough-shaped cross section; Wedge press, characterized in that the cross section of the cavity is tapered in the direction of movement of the ram 5.