DE6912936U - PLANT FOR THE MANUFACTURE OF LARGE OR COMPLEX MOLDED PARTS FROM LIQUID MULTI-COMPONENT PLASTICS - Google Patents

Description

Patent attorney

^τ 'WpL Phye. Dr. Walther 3unlus

S Hannover, Abb * *. 20th

27ο March 1969

DroJ / Hao

My file: 9269

Richard Zippel & Coο KG ₀ , 344 Eschwege, Bremer Strasse 12/27

Plant for the production of large or complex shaped format parts from liquid multi-component plastics

The present invention relates to a plant for the production of clay large or complex shaped molded parts from liquid Mehrkoaponenteifc-Kunetetoffe, consisting of aue a fixed form filling machine «which is equipped with a dosing device, a mixing device and a floodplain * for the termiaohtenr fl uid plastic components is provided, and from einehiebbaren into the form filling machine Forms that are opened during the filling process »

With a known system of this type, format parts made of liquid multi-component plastic " However, this system Weiat the brook part that with large or complex shaped parts the The density of the mostly foamed plastic differs

lioh let and therefore also the mechanical own accountability such parts are different.

In the case of Verpaokungskieten, for example, it happens again and again that the corners are much softer than the middle ones file the Verpaokungekiste, in particular »if this packaging box is prepared on its inside according to the packaging material to be accommodated. These soft corners are undesirable, especially in the case of packaging boxes the corners should be hard and mechanical shocks oppose, while the inside should be as white as possible, so that the packaged goods are stored as softly as possible o Also in the manufacture of upholstered furniture from hemmed Plastics experience similar difficulties: Here, parts are often harder in undesired places than other parts »- When making decorations for furniture« which SoB »reproduces baroque or rococo woodwork, extraordinarily soft treads occur again and again Positions that are undesirable ο

If some places are particularly soft, lies after one The invention recognizes that not enough material has flowed into these places, at other places however, see below Tiel Material for the unevenness of the piping can only be removed with great difficulty. Bean those means of foundry technology that are used in metal casting to avoid similar errors cannot be used with foaming synthetic fabrics o Because here when processing liquid Menromponent plastics, the liquid mixed plastic is poured into the open mold, then is

the mold is closed and only the foaming pressure acting on the inside can push the plastic to the outermost points to press the form «

For this reason you have to assemble these molded parts from several pieces in the production of complicated molded parts

The invention avoids these disadvantages _o The invention creates a possibility to produce large and complex shaped molded parts in such a way that they have a desired hardness at the desired points. In particular, the invention succeeds in producing large and complexly shaped molded parts of uniform material properties.

JXLe invention consists in that working means are provided for moving the discharge nozzle with respect to the opened mold to be filled during the discharge process according to a predetermined program which is set up according to the geometry of the mold Parting plane of the form.

In this way it can be achieved that according to a predetermined program the discharge nozzle is guided and that the discharge nozzle so in places which are particularly hard should be, emits a lot of material and in places which should have a greater softness, little ma-

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material ejects. In particular, a skillful guidance of the discharge nozzle achieve that a uniform material distribution occurs inside the mold.

One possibility is that the feed was carried out intermittently by impulses. According to a set up program, the feed will then take place one step forwards, to the left, from ₀ to the right or to the back in the desired compiled sequence ▼ of many steps <> One such step intermittent feed, however, does not allow an excessively large number of steps, so that particularly complex shapes cannot be filled using such a method «

More complex forms can be better filled with a system in which the versohiebebewege continuous and goes at the same speed and with which the movement of the discharge nozzle with mold sections larger shape cross-section or with different desired strength in loops, zigzag or wavy lines. In this way I read one achieve rapid movement of the discharge nozzle and so the Meet the requirements of teaching component plastics, which fully eject the entire contents of the mold within thirty seconds to a maximum of two minutes required for large forms ο

It is useful if the discharge nozzle on an in two coordinates moving cross table or at the end of one

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Articulated army arranged let. This creates a fast agility achieved »

One can control the movement of the discharge nozzle with the help of a Controlling the template “This is necessary” Provide work equipment for scanning the template, for example Work equipment, which scan the edge of the template. These can be known mechanical work equipment, which is used, for example, in post-form milling machines or in used by stencil-controlled son-oath-burning machines Such a scanning means can also be an optical scanning means, for example a photocell or a photoresistor o

It is expedient if each shape is associated with a separate template "Because in systems of this type, the various molds are filled one after the other in order to exploit the one hand forms the other hand, the system economically as possible _o

Conventional stencils, which have the shape of a plate, the edge of which corresponds to the desired movement the Aueetoßdüae is formed, but are not yet able to meet all requirements for complicated shapes su.

Surprisingly, it has been shown that all requirements of particularly complicated shapes can be met by a Soha-Mone, which is an Ifiatt glass pane

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with a curve ieto optically projected on this With such a template, the most complicated curve shapes can be produced in the simplest possible way without difficulty: The curve drawn becomes simple photographed and projected as a slide onto the frosted glass pane, for example. Also leave changes • The easiest and fastest way to carry out this type of stencil «With conventional photoelectric The discharge nozzle can be scanned with a large Lead accuracy »

The optical project specially designed in this way The ion and scanning device can also be used for other purposes: To guide seers in the sheet metal industry and clothing industry »where there is still the special advantage» that when the magnification is changed the projection by changing the lens divisions or values, uniformly shaped cuts can be made in different sizes, further for guiding Flame cutting machines and similar machines, here you will benefit from the possibility of optical reproduction being able to make use of the control cams · Here you will often find the same control cam over and over again Use for series production of a type of goods or semi-products «

Eb is a special problem to choose the curve so that it has a very specific length according to the required filling volume. while by simply inserting a

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Loop the existing length can be shortened _o Since these extensions and shortenings can be carried out on a drawing that is then projected, adapting the curve to the requirements of the shape is particularly easy with this type of template «

A further advantage of the template type is that the curve can consist of several different colored portions, and may give the established with photocell sensing means corresponding to the sensed color different control commands for controlling the Formenfüllmaschine ₀ For example, it may be expedient, in certain places to interrupt the ejection This can be achieved by choosing a different curve color. In other cases it can be useful that the curves partially overlap, eo that some areas of the form are sprayed twice in a row with the liquid plastic. In these cases the color can be used to to guide the scanning element in the correct way according to the given color ₀

The essence of the present invention is based on in the drawing shown Ausführungsbeiapielen closer explained. Show it:

Fig. 1 with the help of a plate-shaped template controlled system,

Flg. 2 an optically controlled system _s in which the slides are housed in a separate magazine ο

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Figo 3 shows another optically controlled system in which each form carries a slide intended for its control

Figo 4a is a plan view of a mold for the production of a complete armchair _{or the like}

4b shows the control cam on the template for guiding the discharge nozzle

Figo 4c the armchair in perspective view »

Figo 5a is a plan view of a packaging box for two Glass cakes *

Figo 5b shows the control cam for guiding the waste nozzle in the production of this packing box

The discharge nozzle 1 of a system for producing molded parts from liquid multicomponent synthetic materials is attached to an arm 2 which is mounted on a cross table. This cross table consists of a table 3 which is driven by the screw shaft 4, which is driven by the electric motor 5 one coordinate direction is moved o For movement in the other coordinate direction the table T _{9 is used,} which is moved with the help of the electric motor 8 o To the discharge nozzle 1, hose lines 10 lead from the dosing device 9 via the mixing device 11, which also contains the necessary valves « The discharge nozzle 1 is to be moved over the mold 12, the cover 13 of which is open in the illustrated embodiment. Above the discharge nozzle there is a scanning element 14 which scans a plate-shaped template 15 at its edge. This template is held on the fora 12 with the aid of a holder 16,

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Figure 2 shows another embodiment, and Here the template is formed by a ground glass 17 which, with the aid of the holder 18, is attached to the metering device 9 of the stationary Mold filling machine is attached «. A slide projector 19 is arranged above the ground glass 17, which was used to project control curves onto the ground glass screen 17 scanned by an optical scanner 20, which is a movement of the tables by means known per se 3 and 7 undertakes »With this type of control of the movement of the discharge nozzle 1, the individual must respond to the various Forms corresponding slides with the control cams in a specific order in a magazine 21 of the projector 19 can be saved »Here it is useful» if a slide projector is used for projection 19 serves, in which the slides are automatically activated by an impulse from the mold filling system 9 or on one of the into the mold filling system 9, the mold 12 triggered pulse can be changed »

This is not necessary if, as shown in FIG. 3, at each Form 12 the associated slide 22 with the corresponding Control cam is attached and is projected by a projector 23 onto the focusing screen 17, but here something else is arranged »To protect the slide 22 is a wall 24ο

In Figure 4a, the plan view of an armchair with the backrest 6, the side parts 24 and the seat 25 is shown ο While the seat 25 takes up a large area of low height, the side parts 24 and the back

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Part 25 tone of a considerable height. As Figure 4b shows, is therefore the control curve beginning at A and ending at B in the area of the side parts 24 and the back parts 25 guided very closely, while only a few lines of the control curve are on site 25. To illustrate the position of the control curve, this is shown in FIG. 4b ait drawn full lines, while the imperfections of the Seeaele are drawn in dashed lines.

FIG. 5a shows a pressure on a packaging rivet for two glass retorts Figure 5b shows the position of the control curve 26, which is again executed in great lines, while the outlines of the packaging racks are drawn in dashed lines are · Loops 27 and 28 as well as 29 arranged at the corners serve to strengthen the eye · Here, »da die Ausstoffidüae 1 with constant speed and Constant amount of Auestofi see moving, especially a lot Eject material “At point 30 there is a correction the curve shape has been carried out afterwards · First should the curve shape run along the dotted line » It turned out, however, that corner 31 would not then was executed strong enough. Aue this is the reason Cross connection of the line 30 has been made, which shortens the control curve at this point, so that the ejection nozzle 1 can remain longer at location B in FIG. 5b.

You loops 32 and 33 are aa location of the recesses for the retort necks. These loops 32 and 33 are used dasu, enough material for the bottom of these recesses ah to create this place.

With this type of optical stencil it is possible to

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extremely complicated control curve !! with simply » β th means and in the simplest way to produce, Complicated forms of specialist formations of baroque and bokoko woodwork can be filled in this way » that everywhere a uniform material thickness and so that a uniform strength is achieved. There is always the possibility of coloring by different Control curve signals to interrupt the ejection process to give in places where otherwise too much material would go, but also in places where at all no material should be available «With these optically

projected control cams, even the most difficult shapes can be filled in the desired way »

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Claims (1)

itit * · ··· · crt ι · tt ι tt t 11 ·· tt tt tt - 12 - 8ohutsanaprüoho 8 ο Plant for the production of large or complex shaped molded parts from liquid multi-component * plastics »consisting of a stationary form filling machine that works with a dosing device, a mixing device and an AueetoBdüse is provided for the mixed plastics, and from molds that can be pushed into the mold filling machine and that are opened during the filling process, I characterized by working means (3 o 7) for moving the discharge nozzle (1) relative to the open one filling mold (12) during the ejection process according to a predetermined program which is set up according to the geometry of the mold (12). 2ο System according to claim 1, characterized by a shifting movement in two coordinates »System according to claims 1 and 2" characterized by the fact that the movement of the ejector nozzle (1) takes place in loops, zigzag or wavy lines for shapes with a larger cross-section or with different desired strengths. Installation according to Claims 1 to 3 »characterized by - 13 - I) ItI t · ■ · t 0 * 1 1) Il It Il Il - 13 - an arrangement of the discharge nozzle (1) on a cross table (3 ₉ 7) moved in two coordinates or the like ο System according to Claims 1 to J> _9, characterized by an arrangement of the ejector nozzle (1) on an articulated arm driven by two hydraulic cylinders » 6ο system according to claims 1 to 5 » characterized by working means (14) for scanning a template (15h corresponding to the intended movement of the discharge nozzle (1) is manufactured * To system according to claim S ₉ ! characterized in that each mold (12) to be filled in the system has one Template (15) is assigned 8ο system according to claim 6 and characterized, that the working means (12) for scanning the template 'have at least one photocell'. 9ο system according to claim 8, characterized "that the template has a frosted glass pane (17) with a optically on this projected curve (26) is « - 14 - r r ι f ι c [IC ff ( <■ CC (C. re cert C C C C - 14 - 10ο system according to claim 8, characterized »that a slide projector (19) is used for projection» in which the slides are automatically activated by an impulse from the mold filling system (9) or on one of the mold (12) inserted into the mold filling system (9) Impulse to be changed " ο System according to claim 9 »characterized» that the curve consists of several different colored sections and the scanning device constructed with photocells, according to the scanned color, different control commands for controlling the mold filling machine submit o 12 »System according to claim 9» characterized in that each fora to be pushed into the mold filling system (12) led a carrier (22) for the control cam with see