DE1210550B - Method and device for the production of deformed parts in several dimensions from shredded organic fibers, e.g. B. wood chips, and a binder - Google Patents

Description

GERMAN

PATENT OFFICE

EDITORIAL

German class: 39 a7 - 5/06

Number:
File number:
Registration date:
Display day:

1210550
F 417811 c / 39 a7
January 18, 1964
February 10, 1966

The invention relates to a method for the production of relatively thin-walled molded parts, which are shown in two or three dimensions are deformed with relatively sharp transitions, being first from shredded organic fibers, e.g. B. wood chips, and a binder in a first cold pressing a bendable pre-pressed part is produced, in which the two or three dimensions of the desired prefabricated part are arranged to one another so that the flat as possible Inclinations of the corresponding surfaces to the press plane a largely uniform compression of the pre-pressed part is guaranteed, and in a subsequent, usually hot pressing cycle of the Prepress is pressed into its final shape without the transitions from one to the other Dimension can be changed significantly, and with the shape of the preform first the dimension running parallel to the press plane is pressed. - The invention further relates to a Device for the continuous production of two-dimensionally shaped preforms for Implementation of the method according to the invention, the for the cold pressing of the pre-pressed part necessary matrices are designed as a movable link chain, the respective links of the form correspond to the die, and wherein one or more male dies are designed as a press die, the move together with the link chain under pressure and thus compress the bulk material and during the Pressing process run synchronously with the link chain and run back after the pressing process and always again, for the purpose of re-pressing the previously applied bulk material onto the link chain be pressed. - The inventive method can, for example, with success for Use of the production of hollow bodies open on one side from crate parts and concrete cladding.

It is known that both open hollow bodies and U-shaped parts made of organic fibers and a binder can then be pressed with a die and male mold when the inner angles of the parts at the transitions from one dimension to the other are relatively large. Only then can the bulk material be distributed fairly evenly and receive the pressure necessary for the strength of the body in all areas in the pressing process. Such a well-known compression becomes critical when the interior angle falls below about 125 °. But there is a need to use hollow bodies open on one side and U-shaped parts such. B. for boxes, with a method and apparatus for the production of
Parts deformed in several dimensions from shredded organic fibers,
z. B. wood chips, and a binder

Applicant:

Veneer and plywood factory JF Werz jr. KG
Werzalit Preßholzwerk Oberstenfeld,
Oberstenfeld (district of Ludwigsburg)

Named as inventor:

Edmund Munk,

Herbert G. Haas,

Gerd Weinberg, Oberstenfeld (district of Ludwigsburg)

To deform interior angles of e.g. 90 to 100 °. The well-known method fails with such parts so that one for the production of parts deformed in several dimensions with relatively sharp transitions must use pressing tools, the z. B. generate side pressure via slide. Such Pressing tools are, however, several times more expensive than tools consisting of a matrix and a patrix; they are also very susceptible to failure in operation, require a significantly longer construction period, require more laborious maintenance and wear out significantly faster. - When pressing with sideshifter but it is also the strength at the transitions from one dimension to the other (Corners) relatively small, since the fiber structure of the compressed bulk material is inconsistent at these points is.

According to the invention, the preform is formed so that the interior angles of the preform (from one dimension to the other) roughly correspond to the interior angles of the prefabricated part, where the surfaces of the individual dimensions are as flat as possible to the press plane. This is because of this achieves that the surfaces of the dimension that lie parallel to the press plane in the final press passage comes, is designed to be uniformly curved, with the corners of the preform at the transition to the other dimensions almost correspond to the corners of the finished product. The curvature must in this case lie in such an area that they are flat in the second press pass without breaking can be squeezed out. - The corners of the parison

609 507/284

a . 5'5Ό

■ ι -

must largely correspond to the corners of the finished product, because in "this" area tAitfcfr the small radius of the corners no greater deformation can take place in the second pressing pass without the parts breaking in this area. - ■ By the method according to the invention, it is ^; possible, only with matrix and patrix ii. Open hollow bodies or U-shaped deformed parts with an internal angle of the surfaces down to one another 'to press up to 90 °.' Because of the "flat" reinforcement of the pre-pressed part, the bulk material is easy to apply to the die. Experience has shown that pressing tools that only consist of a die and a male part are quick and cheap to manufacture. They are safe, in operation, and require a little maintenance and have a Böehstzahl of Pressungen.zu before _sje;... verschleißen.'Dies means a decisive increase of the .Wirtschaftlichkeit of the method for the production of thin-walled deformed in multiple dimensions "parts with sharp transitions. Because the inner angles of the different surfaces of the part already correspond to the angle of the desired finished part in the pre-pressed part, the structure of the pre-pressed part is only changed slightly in the second pressing cycle. Since "in the case of the pre-pressed part" the relatively planar grain structure ensures a continuous fiber course, a very high level of strength is achieved in the area of the corners, which is essential depending on the intended use of the part. - According to the invention, it is also possible to pre-pressings for U-shaped deformed 'parts such. B. crate parts to produce continuously. A system is used for this, consisting of a revolving link chain with links that correspond to the die required for the production of the pre-pressed part and one or more press punches; which continuously press the bulk material applied to the link chain by driving it under pressure onto the link chain, the press rams running synchronously with the chain during and until the end of the pressing cycle. This ensures that the preforms run continuously from the link belt, the quantity of the pressed profile being determined by the length of the link belt, its operating speed and by the length and the number of subdivisions of the press ram.

To illustrate the method and the device according to the invention, the drawings show four sehematic representations.

Fig. 1 shows a pre-pressed part X, which is intended for a U-shaped part with the legs? the second dimension, the interior angle 3 largely corresponding to the interior angle of the desired finished part and the first dimension of the preform having the curvature 4. The pre-pressed part is produced in that the bulk material is poured into the die 6 and pressed with the male die 7;

Fig. 2 shows a Vorpreßling8, which was pressed over the intermediate stage 9 to the finished part 10, by means of a Werfefeugobsriieies 1% ., And 'jejnes- "tool lower part 12;'; /

Fig. 3 shows a three-dimensionally shaped preform 13 for the production of a one-sided

5 open hollow body. whose abutting edges 14 so: aasggfrildst.isind, .ädäßv5ie:, siGbL in the second 'jPr <eßgang overlap;

'F i g. 4 shows a device consisting of a spreader 15, a chain belt machine

ίο 16, those with the links 17, which have the profile 18, is formed, a ram 19, which is part of the press 20. The bulk material becomes cyclical between the link belt and the ram

.. '. . Continuously pressed to the pre-compression profile 21 and then divided by the cut-off saw 22 into the individual desired pre-pressings.

Claims (1)

Claims: "'.,.' ·. ■ 1. Method of manufacture- relatively ■ thin- '. walled molded parts with relatively sharp. r - transitions in two or three dimensions are deformed, mostly organic ·. Fibrous materials, e.g. B; Wood chips, and one. - Binder, - characterized in that ■ that in a manner known per se in a first, , · Or, third ■ dimension - according to the '■■■ the desired prefabricated parts are arranged in relation to one another ° that the flat inclination of the surfaces to the pressing plane ensures a largely uniform compression of the pre-pressed part, and its transitions from one dimension to the other approximately correspond to the transitions of the desired finished part (10), and 4ass in a subsequent, in ■ Usually the pre-pressed part is hot in its final shape is pressed without the transitions from one to the other dimension in the pressing process changed significantly _c - are, preferably by the Fobkh ■ the preform gebung first ^curved; dimension running parallel to the pressing plane is pressed. 2, device for continuous manufacture ... · production of two-dimensionally deformed preforms, for carrying out the method according to claim 1, characterized in that the dies required for cold pressing of the pre-pressed part as movable links -: chain (17) are formed, the respective "links of which correspond to the shape of the die (6), and that one or more male molds (7) are designed as a pike (19) with the Bring the link chain together under pressure and thus compress the bulk material and during the Pressing run synchronously with the link chain and after the pressing run in a clocked process run back and again and again, for the purpose of renewed compression of the bulk material applied to the link chain, onto the link chain can be pressed. For this! Sheet of drawings