SI24682A - An extruded ceramic product, the manufacturing process of such a product and device for the creation of the product during the extrusion process - Google Patents

Abstract

The invention is based on the problem of the realization of an extruded ceramic article (1), which should be particularly suitable as an electrically insulating carrier of wires of an electrically conductive wire comprising a winding electrical or electronic component, in particular a resistor, a coil or the like. Such a product (1) should be feasible by extrusion, and at the same time it should cover the outer surface of said wires of the wire i.e. in a transversal direction with respect to the direction of extrusion of the spaced conveying (112) and / or the wedge (111) arranged to prevent the movement of said wire windings over the surface of the ceramic article (1). Accordingly, it is an object of the invention to further refine the extrusion process, which should enable the realization of such a product (1), while also providing an extrusion preparation (2), by means of which it will be possible to realize an extruded ceramic article (1) with the aforementioned features. According to the invention, said problem is inter alia resolved by means of a device (2) which, in the region of the outlet opening (23), comprises at least a one-forming roller (25, 25 ') freely rotatably about its axis (250) extending perpendicular to said the longitudinal axis (20) of the device (2) is located in the area of said outlet (23) and is peripherally reciprocally recessed (252) and projections (253) along its periphery (251), wherein at least said projections (253) extend into the light beam area of said outlet opening (23) of the device (2).

Description

Extruded ceramic product, process for making such product and preparation for forming product during extrusion

The invention relates to an extruded ceramic product, but also to a process for the manufacture of such a product as well as to a device for forming a product during extrusion.

According to the international classification of patents, the invention of this kind belongs to the field of processing of mineral materials, namely to the transformation of ceramic composites, in particular to the field of production of molded products.

The invention is based on the problem of realization of an extruded ceramic product, which is particularly suitable as an electrically insulating carrier made of an electrically conductive wire consisting of an electrical or electronic component, in particular a resistor, coil or the like, whereby the product is feasible by extrusion, while at the outer surface it should comprise the course of said wire sheaths, ie in the transverse direction with respect to the extrusion direction of the projected projection or. recesses to prevent the said wire wraps from moving over the surface of the ceramic product. Accordingly, it is an object of the invention to further refine the extrusion process, which is intended to enable the realization of such a product. At the same time, it is an object of the invention to provide an extrusion device by which it will be possible to realize an extruded ceramic product having the aforementioned characteristics.

The transformed product, including the process for its manufacture, is described in W02010 / 015531 Al.

The invention relates essentially to an extruded ceramic product, namely a fully or tubular shaped uniform cross-section, defined by its longitudinal axis and in each case by a corresponding transverse outline, the shape and size of which is constant throughout the length of the product along said axis.

According to the invention, it is contemplated that the product of the previously described species is at least one of its ribbed, in a direction along the longitudinal axis of the running zones of constant width, having a series of alternately repeating and equidistantly arranged convexities and protrusions, which extend repeatedly over the entire length of said width zone and are directed in the transverse direction of the product, namely in a direction meaningfully at least approximately orthogonal to said longitudinal axis. In the context of the aforementioned features, it is preferred according to the invention that the said product is ribbed, namely, provided with said periodically lengthwise product along the axis of recurrent projections and projections, in two with respect to its longitudinal axis of diametrically opposite regions of constant width. Further, in the context of the foregoing features of the invention, it is contemplated that such a product may be ribbed, namely, provided with said recurrent projections along the axis, with recurrent projections and protrusions, also in more than two relative to its longitudinal axis diametrically opposite regions of constant width.

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The said recesses and protrusions are preferably linear and may optionally extend in a direction perpendicular or oblique with respect to the longitudinal axis of said product, and may generally be non-linear, but are uniformly spaced throughout.

According to the above characteristics, the preferred product is an electrically insulating support of an electrical component with at least one coil wound along its longitudinal axis from a wire of electrically at least partially conductive material, in general it may also be the product intended or intended. adapted for a different purpose.

According to a further aspect of the present invention, there is also provided a device for manufacturing an extruded ceramic product having the above characteristics, namely, an apparatus for forming a ceramic product in the extrusion phase, i.e. pre-curing preforms, said device being generally adapted for passage and molding to produce a ceramic product of suitable material in a suitable aggregate state in the direction of its longitudinal axis, and said device comprising an inlet adapted for the entry of said material for manufacturing a product, a forming area in which said material for manufacturing a product is transformed and receives the same transverse contour in shape and size, as well as an outlet through which said material with each desired transverse contour of the product exits preparation.

According to the invention, it is envisaged that such a device comprises at least one forming cylinder which is freely rotatable about its axis, which runs perpendicularly to said longitudinal axis of the device, which is mounted in the area of said outlet and at its circumference is provided with periodically recurrent projections and projections , at least said projections extend into the brightness range of said outlet of the device. According to the invention it is further generally contemplated that such a device may also comprise two inverted diametrically opposed forming cylinders relative to said longitudinal axis, or at least three inverted forming cylinders each spaced apart along said longitudinal axis.

In this case, said recesses 252 and projections 253 may be linear, namely, either in the direction of the axis 250 around which the respective forming cylinder 25, 25 'is rotatable, or obliquely with respect to the direction of said axis 250, around which the respective transformation cylinder 25 is rotated. 25 ', while allowing the invention that said projections 252 and projections 253 may also occur non-linearly, but at a uniform distance at all times.

According to a still further aspect of the present invention, there is also provided a process for manufacturing an extruded ceramic product comprising at least

i) the preparation of a homogeneous mixture of the mineral constituents required at each time, including binders and other necessary additives, for the purpose of producing the desired final extruded ceramic product;

ii) regulating the physical properties of said mixture for extrusion purposes in order to design said ceramic product with the desired transverse shape in each case, and in particular the density, viscosity and flexibility adjustments;

iii) extruding by extruding said mixture into a suitable extrusion device under each necessary pressure by means of a piston or auger or similar means to create the desired pressure through each time a device is directed in the direction of the longitudinal axis of said device defining the longitudinal axis of the semi-finished product as well as the finished product; squeezes out the semi-finished product, leaving the still-untested semi-finished product into account

the foreseeable contractions, due to further processing steps, ensure that the size and shape are taken in each case, and in particular the shape of the transverse outline and at the same time the desired length for the purposes of forming the finished product; and iv) curing the semi-finished product thus obtained, especially at elevated temperature, adapted to the curing of the mixture used, with a view to forming an extruded ceramic finished product with the desired physical properties, in particular electrical insulation, density, strength and hardness,

According to the invention, it is provided in this process that, in step iii), extrusion into a semi-finished product with the already provided shape of the transverse circumference over at least one longitudinal longitudinal area of uniform width and directed along its longitudinal axis at its circumference is imprinted periodically recurrent convexities and protrusions, which take place at least approximately in the transverse direction with respect to the longitudinal axis of the semi-finished product, or. product and also the aforementioned extrusion apparatus e.

In general, it is generally possible to form at least two said areas in said extrusion step (iii) with periodically recurrent projections and protrusions, all of which may be formed at the same time or at least one of the regions formed at each time successively.

Said projections and projections are predetermined in each of the predetermined widths in each of the formed regions, while at the same time said projections and projections are optionally linear in each formed region and extend either perpendicularly or obliquely with respect to the longitudinal axis of the semi-finished product or . product, as well as the aforementioned extrusion apparatus, or the projections and recesses in each of the formed width regions are nonlinear.

The invention will now be explained in further detail with reference to the accompanying drawing, with reference to

FIG. 1 shows an extruded ceramic product in the outline;

FIG. 2 shows an extruded ceramic article according to FIG. 1 further illustrated in a side view;

FIG. 3 illustrates a product extrusion apparatus according to FIG. 1 and 2;

FIG. 4 is a cross-section in the plane A - A of FIG. 3.

The extruded ceramic product according to the invention is generally a tubular shaped single product 1 defined by a longitudinal axis 10 and, in each case, a corresponding transverse outline 100, the shape and size of which are fixed throughout the length of the product 1 along said axis 10. Due to its excellent electrical insulation properties, strength and resistance to corrosion, temperature, humidity and other influences, this product is particularly suitable for use in electrical engineering and electronics, as a carrier for winding wires made of electrically at least partially conductive material, which represents the electrically selected component , especially e.g. electrical resistance, coil or the like.

According to the invention, it is contemplated that the extruded ceramic product 1 of the previously described species, in one of its longitudinal axis 10, of running widths 11, 11 'of constant width B, is provided with a series of alternately repeating and equidistantly arranged recesses 111 and projections 112 which they run repeatedly along the entire length of said area 11, 11 'in width B and are directed in the transverse direction of product 1 and thus in a direction perpendicular to said longitudinal axis 10.

In a preferred embodiment of the invention, product 1 is ribbed, i.e. provided with said recesses 111 and projections 112 in two with respect to longitudinal axis 10 of diametrically opposite regions 11, 1Γ. It is also possible to implement product 1, in which product 1 with said projections 111 and projections 112 is provided in more than two with respect to longitudinal axis 10 of diametrically opposite regions 11, 1Γ.

In this case, said recesses 111 and projections 112 may be either linear or slightly curved, but mutatis mutandis throughout the distance.

In the case of using extruded ceramic product 1, the sketches of the electrically conductive winding material shown in the drawing do not coil the available electrical or electronic components spirally around the product 1 and extend along its surface by a suitable step along said axis 10. Thanks to said recesses 111 and projections 112, said covers being thus securely secured against movement over the surface of article 1, thereby preventing any contact of adjacent casings in any case, even in the event of shocks and / or vibrations that would normally occur when using this product after installation in the moto of the vehicle.

Due to its excellent electrical insulation properties, as well as the strength and resistance of the ceramic material to corrosion, temperature, moisture and other influences, this product 1 is particularly suitable for use in electrical engineering and electronics, as a carrier for wire wrapping of electrically conductive material, which is at least partially conductive. each electrically selected component comprising at least one winding of the electrical conductor, in particular e.g. electrical resistance, coil or the like.

According to a further aspect of the invention, device 2 is provided for the manufacture of the previously described product 1 by means of extrusion, namely, a device for forming a ceramic product 1 in the molding phase prior to its final curing.

Said device 2 is provided for passage and transformation to prepare a ceramic product 1 of suitable material in the appropriate aggregate state of the direction of its longitudinal axis 20. In the direction of said longitudinal axis, device 2 comprises an inlet 21 adapted for material entry, an area 22 in which said material for the manufacture of product 1 is transformed and receives, along the length and length of article 1, the same transverse contour 100, as well as an outlet 23 through which said material with the desired transverse contour 100 of product 1 exits from the apparatus 2. According to the invention, it is envisaged that the device comprises at least one molding cylinder 25 which is freely rotatable about its axis 250, which runs perpendicular to said longitudinal axis 20 of the device, which is mounted in the area of said outlet opening 23 and is provided periodically at its circumference 251. recurrent projections 252 and projections 253, with at least said projections 253 extending it into the brightness region of said outlet 23 of the device 2.

Generally, such a device may also comprise two substantially diametrically opposed shaping rollers 25, 25 'relative to said longitudinal axis 20, and optionally at least three shaping cylinders 25, 25' each spaced apart from said longitudinal axis 20.

According to a still further aspect of the invention, there is also provided a method of manufacturing an extruded ceramic product, comprising the following steps:

i) preparing a homogeneous mixture of mineral components, including binders and other necessary additives, for the purposes of producing the desired ceramic product 1;

ii) regulating the physical properties of said mixture for extrusion purposes to form said ceramic product 1 with the desired transverse contour 100 in each case, in particular density, viscosity, flexibility and the like;

iii) extruding by extruding said mixture in a suitable extrusion device, under each necessary pressure, device 2 in the direction of the longitudinal axis 20 of said device 2 is defined, which defines the longitudinal axis 10 of the semi-finished product as well as the finished product 1, so that the extrusion produces a semi-finished product , whereby the uncured semi-finished product, taking into account all the foreseeable contractions due to further processing steps, is ensured that the size and shape, and in particular the shape of the transverse contour 100 and the desired length, are always provided for the purpose of forming the finished product 1; and iv) tampering with the resulting uncured semi-finished product, especially at elevated temperature, which is adapted to the curing of the mixture used, with a view to forming an extruded ceramic product 1 having the desired physical properties, in particular electrical insulation, density, strength and hardness.

According to the invention, it is contemplated that in step iii) extrusion into a semi-finished product with the already provided shape of the transverse contour 100 at least one of its entire longitudinal longitudinal region 11, 11 'of uniform width B and directed along its longitudinal axis 10 at its circumference 100 a series of intermittently recurring recesses 111 and projections 112 extending, at least approximately, in the transverse direction with respect to the longitudinal axis 10 of the semi-finished product, respectively. product 1 and also the aforementioned extrusion apparatus 2.

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After the circumference of the semi-finished product for manufacturing the finished product 1, several of said areas 11, 1Γ may be simultaneously or successively formed in said step iii), the projections 111 and the projections 112 being preferably equidistant in each of the respective regions 11, 11 ', they are optionally linear and extend either in a direction perpendicular or oblique with respect to the longitudinal axis 10 of the product, and may generally be non-linear, but in such a case, said recesses 111 and projections 112 extend over the entire width B of the area 11, 11 'to each other at regular intervals.

Claims (21)

PATENT APPLICATIONS 1. An extruded ceramic product, namely a fully or tubularly shaped uniform product (1), defined by a longitudinal axis (10) and, in each case, by a corresponding transverse outline (100), the shape and size of which are along the entire length of the product (1) along said axis (10) is invariable, characterized in that at least one of the extending regions (11, 11 ') of the constant width (B) in the direction of the longitudinal axis (10) is ribbed, namely, provided with a series of alternating repeats and equidistantly arranged recesses (111) and projections (112) extending over the entire length of said area (11, IT) of width (B) and directed in the transverse direction of the product (1), namely in a direction at least approximately orthogonal to said longitudinal axis (10). Product according to claim 1, characterized in that it is ribbed, namely, provided with said recurrent projections (111) along said axis (10) along the axis (10), with recurrent projections (111) and projections (112), in two with respect to its longitudinal axis ( 10) Diametrically opposite regions (11, IT) of constant width (B). Product according to Claim 1, characterized in that it is ribbed, namely, provided with said recurrent projections (111) along the axis (10), recurring convexities (111) and projections (112), in more than two longitudinal directions axis (10) of diametrically opposite regions (11, IT) of constant width (B). Product according to one of Claims 1-3, characterized in that said projections (111) and projections (112) are linear and extend in a direction perpendicular to the longitudinal axis (10) of the product (1). Product according to one of Claims 1-3, characterized in that said projections (111) and projections (112) are linear and extend in an oblique direction with respect to the longitudinal axis (10) of the product (1). Product according to one of Claims 1-3, characterized in that said projections (111) and projections (112) are non-linear, but always run at a uniform distance from each other. Product according to one of Claims 1-3, characterized in that it is an electrically insulating support of an electrical component with at least one spiral along its longitudinal axis (10) a winding wire of electrically at least partially conductive material. 8. A device (2) for the production of an extruded ceramic product (1), namely an apparatus for forming a ceramic product (1) in the extrusion stage, namely, a molding prior to its final curing, wherein said device (2) is adapted for passage and transformation for preparing a ceramic product (1) of suitable material in a suitable aggregate state in the direction of its longitudinal axis (20), and wherein the device (2) comprises an inlet opening (21) adapted for the inlet of said material for the manufacture of the product (1) , a molding area (22) in which said material for manufacturing the product (1) is transformed and received along the entire length of the product (1) in shape and size the same transverse outline (100), as well as an outlet (23) through which said a material having the desired transverse contour (100) of the product (1), exits the device (2), characterized in that it comprises at least one forming cylinder (25, 25 ') which is freely rotatable about its running axis (250) perpendicular with respect to said longitudinal axis (20) of the device (2), mounted in the area of said outlet opening (23) and provided with recurrent recesses (252) and projections (253) along its circumference (252), wherein at least said projections (253) extend into the brightness range of said outlet (23) of the device (2). Device according to Claim 8, characterized in that it comprises two relative to said longitudinal axis (20), a substantially diametrically opposed forming roller (25, 25 '). Device according to Claim 8, characterized in that it comprises at least three transformer cylinders (25, 25 ') spaced apart around said longitudinal axis (20). Device according to one of Claims 8-10, characterized in that said projections (252) and projections (253) run linearly and in the direction of the axis (250) around which the respective forming cylinder (25, 25 ') rotates. Device according to one of Claims 8-10, characterized in that said projections (252) and projections (253) extend linearly and obliquely with respect to the direction of the axis (250) around which the respective forming cylinder (25, 25 'rotates) ). Apparatus according to one of Claims 8-10, characterized in that said projections (252) and projections (253) are non-linear, but at regular intervals throughout. 14. A method of manufacturing an extruded ceramic product, comprising at least i) the preparation of a homogeneous mixture of the mineral constituents required each time, including binders and other necessary additives for the purpose of producing the desired final extruded ceramic product (1); ii) regulating the physical properties of said mixture for extrusion purposes to form said ceramic product (1) with the desired transverse contour (100) in each case, and in particular the density, viscosity and flexibility adjustments; iii) extruding by extruding said mixture into a suitable extrusion device at each necessary pressure using a plunger or auger or similar means to generate the desired pressure through each time the device (2) is directed in the direction of the longitudinal axis (20) of the device (2) by which it is defined the longitudinal axis (10) of the semi-finished product and also of the finished product (1), so that extrusion produces the semi-finished product, whereby the size and shape, in particular the shape, and in particular the shape, in particular, are taken into account, in view of all the foreseeable contractions, due to further processing steps the transverse contour (100) and at the same time the desired length for the purpose of forming the finished product (1); and iv) curing the semi-finished product thus obtained, especially at elevated temperatures adapted to the curing of the mixture used, with a view to forming an extruded ceramic end product (1) with the desired physical properties, in particular electrical insulation, density, strength and hardness characterized in that in step iii) extruding into a semi-finished product with the already provided shape of the transverse contour (100) over at least one longitudinally extending longitudinal region (11, 11 ') along its longitudinal axis along its longitudinal axis (10) at its periphery (100) impresses a series of intermittently recurring recesses (111) and projections (112) extending in a sense at least approximately in the transverse direction with respect to the longitudinal axis (10) of the semi-finished product or. product (1) and also the aforementioned extrusion apparatus (2). A method according to claim 14, characterized in that in said extrusion step iii) at least two said areas (11, 11 ') are formed with periodically recurring projections (111) and projections (112). A method according to claim 15, characterized in that all said areas (11, 1Γ) are formed simultaneously. A method according to claim 15, characterized in that at least one of the shaped regions (11, 1 vsak) is formed successively. Method according to one of Claims 14 - 17, characterized in that said projections (111) and projections (112) are equidistant in each of the respective regions (11, 1Γ) of width (B). Method according to one of Claims 14 - 18, characterized in that said projections (111) and projections (112) are linear in each of the formed regions (11, 11 ') of width (B) and are perpendicular to the longitudinal axis (10) of the semi-finished product or. product (1) as well as the aforementioned extrusion apparatus (2). Method according to one of Claims 14 - 18, characterized in that said projections (111) and projections (112) are linear in each of the formed regions (11, 1Γ) of width (B) and extend obliquely with respect to the longitudinal axis (10) the semi-finished product or. product (1) as well as the aforementioned extrusion apparatus (2). Method according to one of Claims 14 - 18, characterized in that said projections (111) and projections (112) are nonlinear in each of the respective regions (11, 1Γ) of width (B).