DE2609005A1 - PRESSING STAMP FOR STRAND OR Extrusion - Google Patents

Description

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Patent attorneys
Or. Manitz · D ^: pl .-! Ng. Dark forest

Dipi.-.ng. Gramkow 2 6 0 9 D 0

Munich, 4th J. 1976

EURAL SAS DI GNUTTI GIULIANO & C ₃ ROVATO (BRESCIA), ITALY.

"Press ram for extrusion or extrusion"

The present invention relates to a ram for strand or. Extrusion of metals, the Pressing intended for both direct or forward pressing and indirect or reverse pressing could be.

The ram is a component of the press device that has very critical and sometimes conflicting requirements must follow.

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OPlGiNAL INSPECTED

The ram must have a high buckling strength exhibit so that he has the maximum, without noticeable changes in shape, on him by the press during the pressing process can absorb applied load.

However, it is desirable that the ram without. disadvantage Can accommodate loads that tend to buckle if the pressing device is not working properly Coaxiality of the Aufnahiaezylinders or housing with the same ram and with the die or the Has pressing head.

Such a deviation from equiaxiality is not to be regarded as extraordinary, even if it is very large loads required when pressing metals.

If the type of stress and wear and tear on a press ram is then taken into account, there is a possibility very advantageous to carry out a repair at a low cost, thereby intervening on the ram in the case of a partial compression or a partial breakage is appropriate.

These desirable features are not adequately suggested by those proposed by the prior art Apprenticeships achieved.

Most used, one-piece ram when he is designed with sufficient buckling strength,

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also has a very high level of flexural rigidity, which means that the press ram does not adapt favorably during the pressing process allowed inside the receiving cylinder. In such press rams from one piece are also great difficulties, the longitudinal duct for to work out the molding compound when pressing backwards.

Press rams have been proposed which are formed by a thin-walled, tubular outer jacket, in which the cylindrical blocks are lined up, in which the bushings for the indirect pressing obtained profiles are elaborated. Even if in this case; the machining of the internal feedthroughs is made easier such dies do not have optimal and adequate flexural strength characteristics Tensile strength in the case in which the extraction of the ram with a fixed press head or fixed die from the receiving housing should be desired.

The object of the invention is therefore to propose a training for press rams for pressing metals, which has adequate resistance to the loads to be borne and generally acceptable Costs can be produced and maintained.

According to the invention, this object is achieved in that a Fieas stamp from a multitude of strung together Blocks that are penetrated by at least one tension rod, which is on the first and the

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last block acts in such a way that the lined up blocks are clamped together.

For a better understanding of the purposes and features of the press ram according to the invention, are below exemplary embodiments shown in the accompanying drawings are described. In the drawing demonstrate:

FIG. 1, in axial section, a press ram according to the invention, which is used for the indirect pressing of profiles suitable is;

FIG. 2 shows a section along the line II-II from FIG. 1;

3 shows in longitudinal section a detail of a variant ues punch to the position shown in Figure 1 Artj

FIG. 4, in ^an axial section, shows a further embodiment of a press ram according to the invention.

In FIGS. 1 and 2, a ram is generally indicated by the reference numeral -10. The ram 10 is made from a base block 11 on which cylindrical, Elements 12 that are essentially identical to one another are lined up, and a head element 13. The head piece is located in block 11 14 of tie rods 15 which freely penetrate the blocks 12 and are screwed into the end block 13.

The punch 10 shown schematically in Figures 1 and 2 is intended for indirect or reverse pressing: its end block 13 therefore carries a die 16, which is held with its support 17 by a ring 18:

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The elements 16, 17 and 18 are intended to represent a sketch of an arrangement of the known type of matrix holder-liatric. The particular training shown is exemplary overall. When performing this arrangement all precautions are taken that are taught by the state of the art.

The implementation of the strand - or. extruded profile extends within blocks 12 and 11 and is released there with 19.

The element 11 forming the stamp base has a frustoconical configuration, which means a shape which is an advantageous one because of its undercut Attack part for pulling the stamp out of the receiving housing, not shown, after completion of the Pressing process forms.

According to the invention, in the stamp of FIGS. 1 and 2, the Compressive stress absorbed during the pressing process from the entire, full cross-section of the blocks 11, 12 and 13, while the tensile stress is passed by the tie rods 15 during the extraction from the receiving housing.

FIG. 3 shows an embodiment of a press ram which is intended for direct pressing. The body of this A total of 20 stamps are to be regarded as completely analogous to the stamp from FIGS. 1 and 2, i.e. the stamp consists of analogous elements 21 and 22, which are held together by tensile elements within the

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End blocks 23 are screwed.

In this latter a threaded bolt 24 is screwed, which keeps a centered Kqfstück or plug 25, which is intended to come with dev to be pressed mass in direct contact ι

In this case, too, is the type of attachment shown of the head piece 25 cited as an example of known designs.

Another variant of a stamp according to the invention is shown in Figure 4 in axial section.

A stamp 30 consists of a base block 31 _s between blocks 32 and an end block partially represented in the 33rd

The various blocks are held braced together by a single, central tie rod 35, which on the block 31 with the head piece 34 and on the block 33 with a nut 36 acts.

The various adjacent blocks 31, 32 and 33 become held mutually aligned by thorns 37, but the blocks allow a little play.

Is the ram 30 for direct extrusion or extrusion determined, it is attached to the head element 33 a conventional plug (not shown). A punch of this type can in any case be used for indirect or reverse pressing used by one or more profiles

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with a suitable die attached to the top and for the profiles bushings are provided in the body of the blocks forming the punch 31, 32 and 33 are arranged eccentrically.

The structure of a press ram according to the invention, which consists of several by means of one or more to the contact surfaces The blocks of vertical tie rods, interconnected blocks, has peculiar and unexpected ones in the application has favorable characteristics.

The ram has namely a buckling strength, which is essentially the optimal buckling strength of a one-piece stamp can be equated.

Such a ram, however, has shown a great ability to adapt to the loads that hejzu tend to bend. The possibility of the blocks mutually shifted along their contact surfaces avoids that they are subjected to bending or kinking. Appropriate tensioning of the tie rods allows the adhesion of the blocks and therefore the order of magnitude of the cutting load to be adjusted, which causes a small misalignment in the blocks, which allows the punch to adapt to the bending loads that are applied to the punch during the pressing process act.

The punch according to the invention is moreover capable of tensile loads record, which with a flawless

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measurement can be adapted to the requirements.

The manufacture of the stamp is made considerably easier by the limited size of the elementary blocks, which can be machined on small machines, with any bushings for those with indirect Pressing obtained profiles can be easily worked out.

The cross-section shown, for example, as circular of the stamp can have any design that corresponds to the cavity of the housing in which the The plunger acts as a pressure piston, and the tie rods become accordingly be distributed in an appropriate manner and in an appropriate number.

The stamp elements, possibly both used are very easy to replace without losing the entire stamp.

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Claims (6)

26Ü9005 ■ 8- PATENT CLAIMS 1.) Press ram for metal strand or. Metal extrusion, characterized by a multitude of blocks lined up next to one another, at least of a tie rod that acts between the first and last block in such a way that they are with each other be braced. 2. Press ram according to claim 1, characterized in that these blocks have a base block for gripping and moving the stamp, a plurality of intermediate blocks with essentially the same Outer profile and an end block, which is intended to act on the mass to be pressed element to hold, with the base block and the end block forming the first and last block of the lined up blocks. 3.. Press ram according to claim 1, characterized in that that each tie rod with a head part that rests on the first block, and with a threaded end is provided, which is screwed to the last block of the lined up blocks. 4. Press ram according to claim 1, characterized in that it is marked chnet that every tie rod with a Head part that rests on the first block, and is provided with a threaded end, on which one on the last 609838/0296 26U9G05 Block of the lined up blocks acting screw nut is screwed on. 5. Press ram according to claim 1, characterized in that the adjacent surfaces of successive blocks has seats for a bolt element, which the blocks with radial play connects. 6. A press punch according to claim 1, wherein the last block has a die for indirect pressing, wherein the blocks forming the punch have a passage for the profile pressed through the die. 609838/0296