HU204462B - Extruding tool for producing bodies of cellular structure - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to an extrusion tool suitable for continuous production of thin-walled cellular bodies. The tool according to the invention has a tool body (1) for forming a cell structure having distribution channels parallel to each other on its inlet side and connected to a collecting cavity. The cell wall forming body (2), which is connected to the collecting cavity corresponding to the shell thickness of the cell structure (10), is disposed at the exit cavity corresponding to the inner contour of the shell of the cell structure (1) for the cell structure forming the body structure (1). EN 204 462 A Scope of the description: 5 pages (including 2 sheets)

Description

Scope of the description: 5 pages (including 2 sheets)

EN 204462 A

FIELD OF THE INVENTION The present invention relates to an extrusion tool suitable for continuous production of thin-walled cellular bodies. The present invention relates to thin-walled cellular bodies produced by a tool, e.g. It can be used as a catalyst carrier in heat exchangers, filters, soundproofing and building materials. For example, a method for producing thin-walled cell structures is that in which the mixture to be transformed (e.g., ceramic powder and plasticizer) is molded and the mixture is pressed by mechanical pressure.

Also known is a casting process in which an aqueous ceramic suspension is poured into a cellular sticker, solidified, and then separated from the sticker.

In addition, U.S. Patent No. 4,259,057 discloses a so-called extrusion method for producing thin-walled cell structures comprising a plastic mixture (extrudable material) consisting of a liquid and a viscosity-improving additive from a carrier material or a compound which is converted into a carrier material by a thermal reaction on an extrusion die body. material which has been machined into the plurality of bores on the inlet face of the tool holder and the axis of the holes coincides with the intersection of the extrusion slots formed on the side of the die body and the holes are connected to the extrusion slits. The body thus obtained is dried (e.g. by incineration) and the body of the body is obtained.

In extrusion, as the cell-shaped bodies can be continuously extruded, productivity is higher and the cost is lower than in the extrusion and casting method.

In the known extrusion process, the holes for the material to be extruded are in direct contact with the extrusion opening. The extruding openings must therefore be arranged axially long enough to force the material to flow laterally and promote uniformity since the extrusion pressure is higher.

The disadvantage of the known extrusion method is the need for a larger extrusion machine due to the long extrusion openings. However, the increase in pressure exerted by the extrusion is limited by the strength resistance of the tool, so when the wall of the cell structure is thin, the cell structure extruded from the extrusion opening is not sufficiently homogeneous, its mechanical strength varies within the same body, so that it is not possible to produce a microstructural strength or a thin thin wall cell structure.

A further disadvantage of the known solution is that the formation of a plurality of holes (having a practical size of about 0 0.7 mm and a depth of 8-10 mm) formed on the inlet face of the tool body can only be realized with high time and high cost.

In addition, U.S. Patent No. 4,468,366 discloses an extrusion tool for producing thin-walled cell structures, wherein deflecting plates are provided in the inlet passages of the die body for braking the material to be extruded, forcing the material to have an approximately equal distribution of the material in the extrusion openings to the transverse flow.

The disadvantages of this disclosed solution are essentially the same as those described in U.S. Patent No. 4,259,057. The extrusion openings in the axial direction 10 have to be formed for a relatively long time even in this case, because of the application of the baffle plates, the material to be extruded has to overcome the higher friction resistance, therefore a higher extrusion pressure, a larger extrusion machine is required.

It is an object of the present invention to provide a tool for the continuous extrusion of thin-walled cellular bodies that can be used to produce a light, homogeneous, thin-walled cellular body, and to provide a suitable tool with relatively little time and low cost.

According to the invention, on the one hand, it has been found that before the extrusion openings the stresses to be extruded in the material to be extruded can be reduced, and on the other hand, the distribution cross section can be increased by the distribution of the distribution holes instead of the distribution holes, the axial size of the extrusion opening can be reduced, Thus, the extrusion process can be carried out on a smaller machine, as the material can be pressed into the tool with less pressure, without the walls of the bodies cracking during the extrusion, drying and firing at relatively low pressure.

The extrusion die of the present invention has a tool-holder frame, a cell-shell forming body, and a tool body forming a cell structure, which has dispensing channels formed parallel to each other on the inlet side of the tool body forming the cell structure and smaller than the cross-section of the collecting cavity at the outlet side of the tool body forming the cell structure. there is an extruding aperture of a size corresponding to the thickness of the cell body forming the cell structure forming the collecting cavity of the cell structure corresponding to the geometry of the shell of the cell structure to be produced.

The invention will now be described in more detail with reference to the drawings.

Amellékeltrajzokon

Figure 1 shows a cross-section of an exemplary extrusion tool according to the invention.

Fig. 2 shows an exemplary extrusion tool according to the invention in a side view.

Figure 3 is a perspective view of a detail of the body 60 of the inventive extrusion tool cell structure according to the present invention;

HÜ 204462 A magnified.

Fig. 1 shows an extrusion tool suitable for the continuous production of thin-walled cellular bodies, which is built up to form a so-called. from the body body forming a single-body cell structure 1, to its outlet face, with a distance corresponding to the shell thickness of the cell structure 10, the cell body forming body 1 and the body body forming the cell structure 1 and the cell shell forming body 2 are inserted into the tool-holding frame 3 by means of 4 support pads. The inlet face 9 of the tool body forming the cell structure 1 is formed with a deflection angle, whereby during the flow of the material to be extruded in parallel sections, a live live life defect is created.

Figure 3 illustrates the design of the tool body forming the cell structure 1, which has parallel distribution channels 6 at the inlet side, and the distribution channels 6 extend into a collecting cavity 7. Extruding openings 8 of the size corresponding to the thickness of the cell wall are formed from the outlet side of the tool body forming the cell structure. The corners of the collecting cavity 7 are formed by rounding the neck 11 to facilitate the flow of material to be extruded.

In the case of the implementation of extrusion tools with relatively larger diameters, there are also provided, if necessary, 5 stiffeners on the inlet side of the body (the tool-forming tool body 1).

The extrusion openings 8 may be triangular, rectangular, or honeycomb, etc., in accordance with the cell unit of the cellular body. shape.

For the production of honeycomb-shaped bodies, a tool body forming a cell structure 1 is advantageously constructed from elements of a slab mosaic _r for more economical production.

As can be seen from the foregoing description, the material to be extruded flows through the distribution channel 6 into the tool body forming the cell structure 1, from which the material to be extruded is pressed into a collecting cavity 7, where the material to be extruded is evenly distributed. Subsequently, the material to be extruded is uniformly pressed on the extrusion openings. The resulting cellular body does not crack, despite the fact that the material to be extruded is pressed at a relatively low pressure.

The process and the tool described herein may not only extrude a ceramic plastic mixture containing glass fibers and other reinforcing materials, but also other organic materials such as e.g. art15 materials etc. and inorganic plastic materials e.g. gypsum.

Claims (3)

An extruding tool for producing cellular bodies having a tooling frame, a cell shell forming body, and a cell body forming body, the inlet side of the cell forming tool body having parallel sizing channels and a cell lining to form a cell body. characterized in that the distribution channels (6) have a cross-section greater than the cross-section of the extrusion orifices (8) Connected to 30 collecting cavities (7) and connected to the output face of a cell body forming tool body (1) machined to the collecting cavity (7) according to the internal contour geometry of the cell structure to be produced, spaced (10) . Extrusion tool according to Claim 1, characterized in that the cell body (1) forming the cell structure is composed of a mosaic element. Extruding agent number according to claim 1 or 2, characterized in that the cell body-forming tool body (1) is formed with an inlet face deflection angle (9).