DE2059760A1 - Extrusion machine for the production of objects made of concrete-like material - Google Patents

Description

6 Frankfufi em .Lin 70 December 2, 1970

George Putti, North Vancouver, British Columbia, Canada

Extrusion machine for the production of objects from concrete-like material

The invention relates to extrusion machines for the production of objects such. B. T-beams, discs, beams or the like, made of suitable, deformable material such. B. Concrete. The malleable material used consists of a relatively stiff mixture and quickly sets to a relatively solid state. The following is the invention described on the basis of the manufacture of hollowed-out concrete slabs.

There are many machines in use which manufacture concrete slabs and other concrete objects by extrusion. An example of the known machines is shown and described like in the US Patent No. 3,159,897 of December 8, 1964. This patent shows a machine with a plurality of augers or drills, each having a spiral ^research. .Ciglied (which is attached to its core shaft. Each drill has a smoothing spindle attached to its downward end so that it rotates with the drill. A vibrator is mounted on the machine outside of the forming area so that the entire Machine is vibrating, and the vibrations are not there

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where to be for best results and the vibrations are also applied to the part of the machine with the finished product. As every smoothing unit is attached to a drill and rotates with this, it is only possible to make recesses in the concrete slabs of circular To shape cross-section and not of any other cross-sectional shape

An extrusion machine according to the invention is at least one a screw conveyor, which extends in the longitudinal direction of the shape of the machine, for the concrete under pressure in the longitudinal direction to move the machine. A shaping element of

"A predetermined cross-sectional shape is oriented or but is substantially aligned with the downward end of the auger and is attached so that it does not come with the latter rotates * Accordingly, the shaping element can have any desired cross-sectional shape, around recesses to produce a corresponding cross-sectional shape in the finished product. The attachment of the shaping element makes it possible to move the shaping element in the same direction or opposite to the direction of rotation of the screw conveyor to rotate, and at the same or a different speed. If a plate with recesses of different Cross-sectional size or shape can be produced

fe, it is only necessary to replace the shaping element.

If, in addition, solid sheets are to be formed, it can be used this can be achieved simply by removing the core forming element, which is not possible with the known machines which the screw conveyor is molded in one piece with the core forming element.

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Preferably a vibrator is provided within the shaping element so that the vibrations affect the concrete at the time the latter is pressed against the molded part of the plate. This Vibrator can be operated with a lower power than the well-known vibrator because it does not cover the entire machine shake or vibrate.

The shaping element can be made so long that it the inner surface of each cavity is shaped or smoothed after the plate has been shaped but while it is still in place located within the mold or it may have one or more post-processing parts or elements that are solid or

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releasable at the downwardly directed end of the main shaping element are attached. Vibration dampers are preferably provided between the shaping element sections, so that the vibrations within the shaping element are not transmitted to the elements or parts for finishing and therefore will not be transferred to the finished part of the plate.

An extrusion machine of the invention comprises means for delivering concrete to a shape, a rotatable conveying i screw in the machine, which extends in the longitudinal direction of the mold to the concrete under pressure to move in accordance with the shape and against the concrete, the is tied to the cross-sectional shape dictated by the cross-sectional shape of the mold

/ any

is, and a shaping element of a 'predetermined cross-sectional shape, which is essentially aligned with the downwardly directed end of the screw conveyor and so fastened is that it does not rotate with the latter. The snail

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moves the material under pressure over the shaping element so that this element creates a cavity of a predetermined cross-sectional shape in the article during its shaping. The screw conveyor has a spiral-shaped RMergHed, which is wound around the core shaft, this Fört!. <3 * - member is preferably attached to the shaft or formed from it. Although it is not necessary for certain purposes, a vibrator is provided within the shaping element preferably so that the concrete of a high-frequency vibration is suspended at the time, while it sets the highest pressure excluded w and against the part of Platte.gedrückt, which is already formed. In addition, one or more finishing elements or sections which are attached to the end of the shaping element in the flow direction by vibration dampers are preferably provided. These finishing elements have the same cross-sectional shape and size as the shaping element.

The conveyor links (flights) of the screw conveyor, which are arranged closer to the core forming element, show a slight one larger diameter than those that are further away from this element, although the core shaft is in this area ^ usually larger in diameter. This increases the compression of the concrete in the deformation area. In order to increase the compression further, the guide surface of the conveyor links (flights) can be radial in the area of the mold be arranged to the core shaft, d. H. they have a profile in contrast to the normal screw-like conveyor links (flights) on. This reduces the tendency of the concrete to move on and over these conveyor links (flights).

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In addition, the edges of the core shaping element, beveled or undercut adjacent to the screw conveyor so that the element differs from the desired end cross-section tapered to a smaller cross-section, adjacent to the auger, creating a smooth packing of the concrete around the item around is enabled.

Additionally or alternatively, the slope of the conveyor links (flights) can be progressively reduced in the direction the shape or the downward end of the screw conveyor to such an arrangement that the use of a parallel arranged core shaft still allows.

In an extrusion machine for making elongated articles of concrete-like moldable material, wherein the material is forced through a mold and the machine is moved forward by the reaction while the material is pressed against the molded part of the article, the improvement of the invention is characterized by a rotatable screw conveyor extending in and longitudinally of the mold to carry the material under pressure through the mold and against the material which is bonded into the cross-sectional shape determined by the cross-sectional shape of the mold. move and by a molding element of any Querschnittsforra near the in the flow direction befind- ä loan end of the screw conveyor, which · is fixed so that it does not rotate with the latter, wherein the screw conveyor moves the material under pressure over the shaping element, whereby this creates a cavity of the predetermined cross section in the article to be molded.

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The invention relates to an extrusion machine for making elongated articles of concrete-like material having a provided with an open end Gestaltgebungsform of a desired cross-sectional shape, at least one rotatable screw conveyor with a located in Störmungsrichtung end in the mold, means for conveying concrete-like material to the Auger and to the mold to be moved through that mold and a shaping element of a cross-sectional shape in the mold near the upstream end of the auger which is fixed so that it does not rotate with the latter.

Further advantages, features and application possibilities of the The present invention emerges from the illustration of exemplary embodiments and from the description below.

It shows:

Figure 1 is a side view of the extrusion machine with one side broken away to show a screw conveyor and its to show adjacent shaping element,

Figure 2 is a plan view of the machine shown in Figure 1,

FIG. 3 shows a horizontal section along the line 3-3 of FIG. 1, which shows two conveyor screws in plan view,

FIG. 4 shows an enlarged vertical longitudinal section along the line 4-4 of FIG. 3, which shows one of the screw conveyors and part of the shaping element in section ,

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FIG. 5 shows a cross section along the line 5-5 of FIG. 3;

FIG. 6 is a view of the end of the machine in the direction of flow,

FIG. 7 shows a longitudinal section through an alternative form of the screw conveyor,

characters

8, 9 & 10 reduced end views of panels produced by I.

this machine are shaped, and recesses of three different cross-sectional shapes,

FIG. 11 shows an enlarged longitudinal section through the outer end of a screw conveyor, similar but somewhat different from the screw conveyor according to Figure 4 and

Figure 12 is an enlarged section through the outer end a screw conveyor which is still another form of the invention.

In the figures there is an extrusion machine 10 according to the invention shown, which is suitable to move over any suitable surface to objects from malleable To create material such as B. Concrete slabs. The objects can be molded on the ground or any other foundation which actually forms the bottom surface of the mold of the machine. In the exemplary embodiment, the moves Machine along a base plate 12 with vertical sides 13 and 14 which form rails for the machine, the Base plate in a suitable manner, such as. B. through profiles

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15 and 16, on which the sides 13 and 14 rest, supported will.

The machine 10 consists of a main frame 19, which Has side parts 20 and 21 which are connected to one another by cross members 22 and 23 at their opposite ends are. A support frame 26 is attached to and extends on the side members 20 and 21 between the ends thereof across the machine. The frame 26 can be moved upwards and downwards relative to the main frame 19 by means of bolts 27

w can be adjusted. The device 19 is provided with wheels 28 which roll on the rails 13 and 14. Since it is necessary to prevent the upstream end 30 of the machine from lifting during operation of the device, brackets 32 extend downwardly from the framework 19 * are engaged, shown in Figure 6. When the machine 10 is used to form a narrow slab or beam with a single recess therein, only one auger 37 is provided. However, there are usually several of these screws in the machine, two screws are in the one shown

^ Machine shown. Since the screw conveyors and the shaping elements associated with them are each the same, only one arrangement is described below.

The screw conveyor 37 is in suitable bearings at one end recorded, which are carried by the support frame between the two side parts 20 and 21. This snail Let assembled from a conveyor link (flights) 40 which is attached to or formed from a hollow core shaft 41 is. In the illustrated embodiment, the shaft

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a straight section 44 which extends over a certain part of the length of the screw conveyor and a diverging one Section 45, which extends over the remaining part of the screw at the end in the direction of flow 46 extends. The conveyor link 40 (flight) may have a constant outer diameter, as at 49 in FIG Figures 1 and 4 shown. Alternatively, and as described with reference to FIG. 11, the outer diameter of the Conveyor link (flight) on the one located in the direction of flow The end of the snail will be bigger.

Each worm 37 is rotated appropriately. By doing

/ The only exemplary embodiment is a screw through a 'chain and Gear arrangement 54 driven, which by a suitable Power source, such as B. an electric motor 55 * which is attached to the frame 26 is driven. While the other worm can be driven by the drive 54, the latter worm is preferably in the opposite direction Direction through gears 56 and a chain and gear arrangement 57 rotated.

A shaping element 62 is disposed at the downstream end 46 of the screw 37, and so on mounted so that it is not rotated by the screw conveyor. In the exemplary embodiment shown, the shaping element is 62 attached to the end of a hollow shaft 63 which at its opposite end from the support frame 26 is worn. The shaft 63 may be fixedly mounted or, as shown, mounted so that it can rotate can perform. In such a case, the shaft is supported by a chain and gear assembly 64 which is provided by a suitable power source is driven, such. B. a

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Electric motor 65 driven. The shaping element 62 is fixedly or movably attached to the end of the shaft 63, beyond the outer end of the screw 37, and in the illustrated embodiment the shaping element is on attached to the end of the shaft 63 by bolts 66.

The shaping element 62 can be of any desired cross-section provided that the shaft 63 is not rotated, e.g. Oval, square, triangular or the like, or if it is desired to form panels without a recess, element 62 can be removed. However, when the shaft 63 is rotated, the shaping element will form a recess of circular cross-section. In such a case the element itself may be circular in section. The shaping element can be no larger in cross-section than the screw conveyor, as shown, or it can be larger in cross-section.

A vibrator 68 is preferably attached within the shaping element 62. Any suitable vibrator can be used for this purpose, e.g. B. an eccentric vibrator as shown. The vibrator 68 consists of a body 70 which is mounted on a shaft 71, which is a slightly offset ™ relative to the elongate central axis of the body. The shaft 71 is supported in bearings 72 which are carried by a housing 73 which is held in the forming element and which has perforations 7 ^ -. A drive shaft 75 is connected to one end of the shaft 71 and extends longitudinally through the shaft 73 to a suitable power source, such as a power source. B. a small electric motor 76 carried by the frame 26 beyond the

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End of the shaft 63 shown in Figure 1. The bearings 72 are lubricated by oil 79 in the shaping element 72, the shaping element serving as a housing or container for the oil. The level of the oil normally rises above the bottom of the vibrator body 70, so that the latter sprays the oil to lubricate the bearings a suction through the perforations 74 which draws oil through the perforations even when the level of the oil is low. In fact, an oil mist is always present within the forming element to keep the bearings 72 lubricated.

When the shaping element is removed to panels without To create a recess, obviously the vibration, if desired, necessarily applied externally to the body. Such arrangements are well known and therefore not described in detail here. It is clear that with a core forming element as an alternative to that inner vibration system shown or in addition to this an outer vibration of the form can be communicated.

The shaping unit 62 can be relatively long, or it can be | of two or more interconnected sections exist as shown. In such a case, the shaping element consists of a main section 82 which is connected with and supported by the outer end of the shaft 63 and two additional sections 83 and 84. The two additional Sections are the same size and shape in cross section like the main section 82, and the section 83 is connected to the section 82 by means of a damping member 86

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connected, while the section 84 is connected to the section 83 by means of an attenuator 87. The main section 82 serves as a shaping element, while the sections 83 and 84 serve as finishing elements. Any suitable type of attenuator can be used. An example is shown in FIG. Each attenuator consists of a resilient block 88 located between the connected sections and bolts 89 extending from the sections into the block to hold these elements together. An egg hopper 90 is mounted on the frame over the inner end of the '37 auger. This ψ hopper directs previously mixed concrete of the desired composition into the area between the sides of the frame 19 at the inner end of the auger or augers. A majority of these are usually similar

/available

Screws in a device of this type '. The width of the to be produced Plate is determined by edgewise side plates placed on opposite sides of the auger are. There can be one or more of these panels on each Side be arranged. In the embodiment described, there are two substantially aligned plates 92 and 93 located on one side of the machine and substantially aligned plates 94 and 95 on the opposite side ^ the machine. The plates 92, 93, 94 and 95 are for adjustment attached to the frame side parts 21 and 22 by means of bolts 97, 98 and 100 accordingly. The panels can against this Side parts and moved away from them by means of the bolts. The plates 92 and 94 are usually light against one another inclined towards the flow and discharge end of the Machine, while the plates 92 and 93 are usually inclined towards each other in the same direction, but to a lesser extent. The distance between the ejection ends of plates 93 and 95 >

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indicated at 102, determines the width of the completed Product.

A support plate 105 extends across the Machine, over its screws and shaping elements and is attached to the side parts 20 and 21 and vertical adjustable to these by washers and bolts 106. One or more horizontal head plates are on the holder plate 105 above the screw and shaping elements hung up. In the illustrated embodiment, head plates 108 and 109 are adjustable by bolts 111 and 112 hung up. The side panels 92, 93, 94 and 95 and the top Panels 108 and 109 provide the sides and top of a mold 115 for forming the concrete objects or panels . The surface on which the machine 10 "works, and which forms the bottom of the mold is represented by the base plate 12 in the exemplary embodiment shown. ■ Prepared concrete is poured while the machine is in operation of the desired consistency via the filling funnel 90 promoted to the space immediately below it. The concrete fills the mold 115 by pouring over the auger and the shaping elements connected to them. While the snails rotate, they move d ^ j ^^ l ^ ön against the loading end of the machine. However, if this move meets resistance and is stopped by the part of the slab which is already formed, the concrete becomes a Pressure is applied as it moves through the mold and the machine moves in the opposite direction. Of the Pressure in the concrete depends on the force necessary to move the mass of the machine. The pressure can be controlled are made by changing the angles of the side plates 92, 93, 94 and 95 and / or the top plates 108 and 109. The concrete is also named around sections 82, 83 and 84 of the shaping egg

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INSPECTED

moves when it moves towards the discharge end of the Machine moves.

While the concrete is moved around the shaping elements, these form recesses in the finished product of the same cross-sectional shape and size as the shaping elements. The vibrators work within the shaping elements and this subjects the concrete to high frequency vibrations while it is compacted into the finished object. This improves the compression, and when * strength-increasing strands or cables to tecken through the machine ers "to be incorporated in the finished plate, the vibration ensures a firm adhesion between the strands or cables and the concrete within the concrete. The compression is as a result of the vibrators

/ ■■ ·

within the concrete so well that the finished slab or object is immediately self-supporting.

The finishing sections 83 and 84 support the concrete within the formed recesses as the concrete is still subject to external pressure. They also support the finishing and smoothing of the surfaces of the recesses fc inside the panels, if the entire shaping element is circular in cross-section, it can be at the same or a different speed as the rotational speed of the screw conveyor at different speeds in the same or opposite to the direction of rotation of the screw conveyors Direction to be rotated. This enables the screw conveyors and the shaping elements to rotate with optimum Speeds for their respective purposes. Smooth the rotating finishing sections of the shaping elements

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the surfaces of the recesses. Attenuators 86 and prevent the vibrations from being transmitted from the vibrators to finishing sections 83 and 84 and to the finished portion of the panel.

Figure 7 illustrates another form of auger 37a having a tubular core shaft 120 which does not have a diverging outer section similar to section 45 on shaft 41. The screw conveyor 37a has a helical conveyor member 122 which is wound around the shaft 120 and attached to it. The snail shaft 120 is rotated in the same manner as the screw shaft 41 described above.

In the example according to FIG. 7, the shaping element is 62 mounted on the end of a tubular shaft 125 which may or will be permanently mounted in the machine rotated by the same drive means as the shaft 63 of the worm 37. The remaining elements of the worm 37a are the same as that of the screw 37 "and the two screws work in the same way.

The machine 10 is equipped so that suitable reinforcing rods can extend through it so that the rods in the concrete slabs are incorporated while the latter are being formed. In a similar way, pre-parity strands or cables extending through the machine which are also incorporated into the panel. By attaching the vibrators within the shaping elements, the high-frequency vibrations are communicated to the concrete exactly there, where they are needed and where they will get the best results. These vibrations also cause a firm bond between

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the concrete and the prestressing cords or cables. St.
ji "·

When the shaping elements are mounted so that they can remain stationary while the screw conveyors rotating, it is possible to form recesses of any desired cross-sectional shape within the concrete slabs. These Shaping elements can, for. B. cylindrical, square, oval or any other suitable shape in cross section ' be. In Figures 8, 9 and 10 are finished

Plates 1250, 131 .., 132 shown, with recesses 134, 135 P and 136 of correspondingly different cross-sectional shape. These are examples of the different shapes that can be made. When the shaping elements are cylindrical are, they can be in the same direction or -, opposite the direction of rotation of the screw conveyors with the same or at a different speed. The shaping elements can therefore be rotated so that Well-gfe | iont 4 recesses made in the plates will. ■

The various finished sections in the shaping elements allow the panel to be internally supported for a longer period after the panel has been molded around the main shaping elements than is normally possible. The attenuators between the shaping element sections prevent the high frequency vibrations from being transmitted to the finished plate so that the latter is dimensionally stable regardless of the fact that it is being shaped and out of the

• »« US; ■ ■

Formation form has been expelled.

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Another advantage of the machine is that the shaping elements can be easily and quickly removed from the machine without interfering with the screw conveyors when the production of compact concrete slabs is desired. The side panels 92, 93, 94 and 95 can be easily moved sideways to produce panels of different widths, while the top panels 108 and 109 can be easily adjusted in the vertical direction. This machine can be used to make panels of different thicknesses and with recesses of the same or different sizes. The transverse support plate 105 can be adjusted up and down on the framework 19 if a change in the thickness of the plate to be produced is desired. The frame 26 can also be adjusted up and down to center the recesses relative to the top and bottom of the panel. If the Ausnehmungsgröße change _s to be, it is not necessary to replace the screw conveyors, but only need zuwerden replaced their related design elements. Two layers of recesses can be formed in the plate by two layers of screws and shaping elements within the mold of the machine.

In the case of the screw 139 shown in FIG. 11, the core shaft 140 has conveyor links (flights) 141 which are connected to it by welding or bolted connections or which consist of one piece with it.

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The shaft 140 has a diverging section 142 and the conveyor members 141 on this section have an increasingly larger diameter in the direction of the core forming element, so that their compressive effect on the concrete in this area is increased compared to the effect of conveyor members which are not as enlarged. While the conveyor members (flights) on the section of the core shaft arranged in parallel are of conventional helical shape, the conveyor members on the diverging section show a cross-sectional shape W with radial end faces 143 in the direction of the shaping element, ie in the direction of flow and rising surfaces 144 in that of this Element facing away from direction.

This shape aims to resist movement of the concrete along and beyond the surfaces 143 and therefore further increases the compression effect of the screw conveyor. In order to guide the concrete into the mold, the end of the core forming element, which one is adjacent to the auger, beveled or pointed, as seen at 145.

It is desirable that the distance, i.e. H. the slope * of the conveyor links (flights) to that in the direction of flow located end of the screw becomes smaller, as shown, and (read characteristic can be compared with the previous one described trains can be combined or can replace them.

FIG. 12 shows a screw 139 with a screw extension 150 which can be detached from the screw in the direction of flow located end of the screw in a suitable spiral, such as. B. by bolts 151 attached. This extension will used when the core forming element 6 has a large cross section in relation to the screw 139. the Extension 150 diverges outwardly in the direction of flow between the adjacent ends of the screw and the shaping element. The extension has a promotional link

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(flight) 153 on its outer surface, which is preferably the same as the conveyor link 141 of the screw 139 However, the extension can also be any other desired Have type of conveyor links (flights). The extension and its conveyor links decrease in diameter from the auger to the shaping element.

While the extension 150 is shown on the linden of the auger 139 has been, it is of course possible that this Extension engages the end of the other auger described above.

The conveyor link 153 (flight) of the extension 150 conveys the concrete in the direction of flow and outward so that the relatively large shaping element 62 can be pulled through the concrete without too much power for the purpose require. In addition, the funding extension helps pack the concrete in the mold around the forming element. The extension 150 can be removed from the screw when the shaping element is substantially the same size in cross section as the snail.

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Claims (21)

Claims 1.) Extpusion machine for the production of elongated Objects made of concrete-like malleable material, the material being forced through a shape and the machine is moved forward by reacting while the material is against the molded part of the article is pressed, characterized by a rotatable screw conveyor (37, 37a, 140), which extends in and in the longitudinal direction the mold (115) extends to move the material under pressure through the mold and against the material that becomes a Cross-sectionalforjpiy. ,, which by the cross-sectional shape the form prescribed is,.,. has been tied to move and through a Formgebμngselement (162) of a any cross-sectional shape near the end of the screw conveyor in the direction of flow, which is mounted in this way /with is that it does not rotate, the screw conveyor the material moves under pressure over the forming element, whereby this element has a recess of Shapes predetermined cross-sectional shape in the article during its manufacture. 2. Extrusion machine for the production of elongated objects made of concrete-like material, characterized by a shaping mold (115) provided with open ends of the desired cross-sectional shape, by at least one rotatable screw conveyor (37 »37ä, 140) with an end in the flow direction in the mold, by means (90) for the supply of concrete-like material to the screw conveyor and the mold which is moved by that mold and by a shaping element (62) of any one 109824/1287 • Cross-sectional shape in the form near the end of the screw conveyor in the direction of flow, which is so is mounted so that it does not rotate with the latter. 3. A machine according to claims 1 to 2, characterized in that that the shaping element (62) is substantially aligned with the screw conveyor (37). 4. A machine according to claims 1 to 3, characterized in that the screw conveyor has a core shaft (41, 120, 140) with a spiral conveyor link wound around it ' (flight) (AO, 122, 141). 5. A machine according to claim 4, characterized in that the core shaft. (41, 120) has a constant diameter over its entire length. 6. A machine according to claim 4, characterized in that / ι 40
the core shaft increases in diameter towards the end in the direction of flow. "'■■ * ■ 7. A machine according to claim 4, characterized in that the core shaft is hollow and a support shaft (63) ä includes -welcher extends through and beyond the left in the flow direction end of the auger, wherein the forming member is mounted on said shaft and carried by the shaft. 8. A machine according to claims 1 to 7, characterized by means (63) for movably securing the shaping element in a position relative to the screw conveyor. 109824/1287 9. A machine according to claims 1 to 8, characterized by a vibrator (68) which is mounted inside the shaping element » 10. A machine according to claims 1 to 9 »characterized by means (63, 65) connected to the shaping element to make this element independent of the Rotate feed screw. fc 11, A machine according to claims 1 to 10, characterized in that that the shaping element consists of a plurality of interconnected sections (82, 83, 84) consists. 12. A machine according to claim 11, characterized in that the shaping element portions are releasably together are connected. 13. A machine according to claims 1 to 2, characterized in that that the shaping element is made up of a plurality ■ of interconnected sections (82, 83, 84) ; consists and that the end of the screw conveyor adjacent ü section (82) includes a vibrator (68). 14, A machine according to claim 13, characterized by vibration damping means (86) which connect the between the shaping element section in which the vibrator is mounted and form the next section. 15 · A machine according to claims 1 to 14, characterized by a frame (19) with side parts (20, 21), the are suitable to cooperate with a base plate (12) in order to create a shape between them, whereby 109824/1287 this form in el cn and ^L: ing s direction of this molding space extends and this base plate is the bottom wall of the mold and the screw conveyor is disposed in the forming space and extending into the mold, and wherein the material supply means are arranged to the Materil into the shaping space around the screw conveyor. 16. A machine according to claims 1 to 15, characterized in that that the mold has a substantially horizontal top plate (108, 109) and substantially vertical spaced apart side plates (92, 93, 94, 95) and the means (97, 98, 99, 100, 111, 112) are provided for changing the angle of these top and side panels relative to the longitudinal axis the form. 17. A machine according to claim 6, characterized by conveyor links (flights) (141) of the conveyor screw (139), those in diameter to that in the direction of flow At the end of the screw conveyor increase progressively over the part of the core shaft of increasing diameter. 18. A machine according to claims 1 to 17, characterized by conveyor members (flights) (141) of the screw conveyor (139) which consist of individual parts (I43 _t 144) at least at the end located in the flow direction (characterized by flights (141 ) of the conveyor (139) at least towards the downstream end thereof are sectional (143, 144). 109824/1287 - 24 - 19. A machine according to claim 18, characterized by Conveyor links consisting of individual parts (sectional flights), their outward-facing surfaces (144) are inclined with respect to the radius of the core shaft. 20. A machine according to claims 1 to 19, characterized in that that the upstream end (145) of the core shaping element.s to that in the direction of flow located end diverges to a section which corresponds to the desired final section of the core. 21. A machine according to claims 1 to 20, characterized by an extension of that located in the direction of flow End of the screw conveyor between the latter and shaping element adjacent to this end, wherein on this extension a spiral conveyor member is arranged with increasing diameter of the conveyor screw to the shaping element. 109824/1? 87 Blank