EP3898032A1

EP3898032A1 - Method for the generative manufacture of at least one article, use of a printhead and motor vehicle

Info

Publication number: EP3898032A1
Application number: EP19813498.3A
Authority: EP
Inventors: Anwar Shad; Sven Crull; Tobias Opitz
Original assignee: Volkswagen AG
Current assignee: Volkswagen AG
Priority date: 2018-12-19
Filing date: 2019-12-02
Publication date: 2021-10-27
Also published as: CN113195132A; WO2020126427A1; DE102018132938A1

Abstract

The invention relates to a method for the generative manufacture of at least one article, to a use of a printhead and to a motor vehicle, in particular a passenger car. In a method for the generative manufacture of at least one article (20), a layer of powdered material (22) is arranged and a binder (27) is discharged onto at least one region of the powdered material (22) for the solid bonding of particles of the powdered material (22) for the purpose of manufacturing the article (20). An additional material is discharged onto at least one region of the powdered material (22) for influencing at least in certain regions a property of the article (20) to be manufactured. The binder (27) and the additional material are discharged by means of a common printhead (10) in flow paths that are separate at least in certain segments.

Description

Process for the generative production of at least one object, use of a printhead and motor vehicle

The invention relates to a process for the generative production of at least one

Object, a use of a print head and a motor vehicle, in particular a passenger car.

A generative manufacturing process for the production of three-dimensional components is the 3D printing process Binder Jetting. A powdery material is applied in layers and a binder is selectively applied at the points where the powder is to be solidified to form the component. This is repeated until the component is built up in the desired shape. Unconsolidated powder is then removed.

In the production of metal components using this method, the component produced in this way from metal powder is sintered into the finished component following the described construction process. The material is softened at high temperatures, but not melted. As the components do not have their full strength before the sintering process is completed and are subjected to gravity in the sintering furnace, deformation or warping can occur depending on the component geometry. In particular cantilevered component areas can be deformed due to gravity. The components also typically shrink during sintering. The adhesion of the underside of the component to the base can lead to deformation of component areas due to the respective frictional resistance.

It is known to also use the described deformations by means of support structures

Sinter supports referred to counteract, which can be made of ceramic, for example. These support the component to be manufactured in areas and thus prevent deformations and. a. due to the effect of gravity. Due to the higher melting point of the ceramic compared to the metal, the use of ceramic prevents the metal component to be produced from binding to the support structure, which is therefore easily removable from the sintered component.

However, since such support structures cannot be produced in unlimited size and complexity, the size and complexity of the components to be produced are severely restricted. In addition, during the sintering process, there are different, depending on the material

Shrinkage, of support structure and component instead, so that despite the use of support structures, the components can be deformed.

A related method is known from EP 2 529 694 B1, which discloses a method for the generative production of ceramic shaped bodies by 3D inkjet printing. Here becomes a ceramic slip, i.e. a suspension of ceramic particles in one

Dispersing agent, applied in layers on a carrier and hardened, preferably by means of temperature change. The particles for making the body are discharged from a nozzle. The resulting body is subjected to chemical treatment or heat treatment so that the binder is removed. Several ceramic slurries are used, the proportions of which are controlled depending on the location, so that the composition of the body produced varies. There will be slips

Ceramic particles, free-radically polymerizable binder and possibly wax are used. The body produced is then sintered.

DE 10 2012 101 939 A1 describes a method and an apparatus for

Layered structure of a shaped body. The next layer is applied before the layer below it has hardened. Material for producing the shaped body is applied from a nozzle and, in particular, support material is applied simultaneously around it, which is as heavy as the body material and in this way prevents the body to be produced from flowing or shearing off. The support material is also applied from a nozzle. The application takes place in an essentially vertical layer, so that support material is applied to the support material and not to the material for forming the shaped body. It is clearly evident from FIG. 2c and paragraph [0088] of this document that the support material and the material for producing the shaped body are applied from spatially separated nozzles. The nozzles are not interconnected. In particular, the materials are not output from a common print head.

US 9 833 839 B2 discloses a method for producing a body, one

Support material and an intermediate layer. It becomes a first material

Support structure made. The intermediate layer is produced in such a way that it

Support structure contacted. A second material is made adjacent to the

Interlayer made a surface of the body. The second material comprises powder and a binder system with at least one binder, the binder system serving to hold a final shape of the body during the processing of the body to the final part. The processing includes debinding the final shape to remove the binders and sintering the final shape. The intermediate layer prevents the support structure from binding to the body. The material of the intermediate layer is arranged with a deposition tool and the material for producing a body is applied with a print head. It is the object of the invention to provide a method and a use which allow the generative production of complex or large objects in a particularly simple and inexpensive manner.

The object is achieved by the method for the generative production of at least one object according to claim 1 and the use of a printhead according to claim 10. Embodiments of the method are specified in subclaims 2-9. In addition, a motor vehicle according to claim 11 is provided.

A first aspect of the invention is a method for the generative production of at least one object. A layer of powdery material is arranged and a binder is applied to at least a region of the powdery material for the firm connection of particles of the powdery material for the purpose of producing the object. Furthermore, an additional material is applied to at least one area of the powdery material for at least area-wise influencing a property of the object to be manufactured. The binder and the additional material are applied in at least sections of separate flow paths by means of a common print head.

In particular, the process used is the process for 3D printing referred to as binder jetting. To build up the object, a large number of layers of the powdery material are typically applied and the material of each layer is solidified in regions by means of the application of binder. The method features according to the invention can be implemented in each of the layers applied.

The layer is typically arranged in such a way that a horizontal plane is created, wherein an object can consist of several planes or layers. The object produced is then separated from the non-consolidated powdery material surrounding it. Filler material can be applied in each shift.

The powdery material is in particular a metallic material, that is to say a powder made of at least one metal and / or at least one alloy. It can include one or more components or substances, such as filler materials,

Alloying elements or the like. It can be composed differently in different areas of the layer and / or in different layers.

Typically, a uniform powder is used for all layers and / or all areas of a respective layer. The powdery material is on a

Receiving device or arranged on a previously arranged layer. A binder, also known as a binder, is a material that holds the particles of a powder together or binds them together to form a coherent one

To form object. This can be done mechanically, chemically, by adhesion and / or cohesion. The binder is typically applied in such a way that it is in

Cavities between the particles is arranged and establishes a firm connection between them, so that the particles are fixed or immobile in relation to each other. The firm connection of the particles does not stand in the way of that produced in this way

Object may have only a low strength.

In the production of objects made of metal, the object produced in this way is referred to as a green compact or green body and usually has only a low strength, so that the mechanical stress on the green body should be minimal. By means of the typically subsequent sintering process, the green body is used to produce an object with a higher strength than the green body, in which there are direct bonds between the particles between a large part of each of the adjacent particles. Of course, this does not exclude that voids or pores can remain in the article even after sintering.

In particular, the binder is composed such that it is in one

Debinding process and / or is substantially removable or decomposable under the influence of heat. For example, the binder does not include any additives or additional particles that cause a change in the properties of the object to be produced in the sintered state. Typically, the binder comprises a solution and / or one

Suspension.

The additive material can comprise a solution, a suspension, particles and / or solutes. In particular, the additional material does not comprise a binder or a polymer.

For example, the additional material is composed such that it is one

Debinding process and / or exposure to heat to remove the binder substantially completely persists in position in cavities of the powdered material. The additional material is applied to at least a region of the powder which is influenced or not influenced by the binder.

The influencing of a property means in particular an influencing of the property in relation to surrounding areas, that is to say a local setting of a desired one

Property of the item in a desired position. Alternatively, you can

of course also in all areas of a layer or several layers

Additional material can be applied. Thus, at least two different materials, namely a binder and an additional material, are applied to the powdery material in at least partially different flow paths. In particular, these are applied by means of different discharge openings of a print head, so that the separate ones

Flow paths exist at least between the print head and the powdery material or the object to be produced. Typically, binders and

Additional material directed in completely different flow paths

for example, can run essentially parallel. In particular, the binder and / or the additional material are applied at least in sections in a continuous volume flow.

In particular, the binder is deployed by means of at least one first delivery opening of the print head. In particular, the additional material is applied by means of at least one second delivery opening of the print head. Typically, the first and second discharge openings are configured in the same way.

A printhead means a device with at least one discharge opening

Output of material that is arranged or can be arranged such that a

Relative movement between the print head and an object to be manufactured or a receiving device for receiving an object to be manufactured can be realized. In particular, the discharge openings of a print head can be moved by means of a common movement device, travel device or drive device. Delivery openings arranged in a print head are fixedly or rigidly connected to one another. They can be arranged in separate, rigidly interconnected housing parts or in a common housing of the printhead. In particular, the print head has at least two redundant designs for each material to be dispensed

Discharge openings, so that if a discharge opening of a material to be discharged malfunctions, an additional discharge opening is available for this material. In particular, the print head is or are the respective ones

Delivery openings for dispensing liquid materials such as solutions or suspensions are set up. However, it is not excluded that the print head has at least one discharge opening for the discharge of a powdery material. In particular, this has a larger cross section than discharge openings for dispensing liquid materials.

The additional material can penetrate the respective layer of the powdery material and in this way influence the material of this layer. For example, it can be suitable for influencing the material in or after a sintering process and for this Purpose include alloying elements for alloying with a metallic powdery material.

The additional material can contain any single or any combination of the alloying elements known in metallurgy, in particular C, Cu, Mn, Ni and / or Si. In a subsequent sintering process, alloy formation can take place locally, at least locally, through the diffusion processes of the powdery material taking place under the influence of heat and possibly increased pressure, which can possibly be reinforced by softening the material.

The additional material can comprise sintering additives and / or smaller particles than the powdery material, for example made of the same material as the powdery material. This can improve the sintering process, for example increase the sintering activity, and thus increase the achievable density or strength of the objects after sintering. The additional material can comprise reinforcing particles, for example comprising

Tungsten carbide and / or elemental carbon to locally increase strength. The additional material can be set up to influence the chemical composition of the object to be manufactured or its material properties, such as, for example, the corrosion resistance to certain media or environments. It can be set up to have physical properties such as

To influence thermal conductivity and / or the electrical conductivity in a targeted manner. For this purpose, it can comprise copper, for example. For example, by

Alloy elements, carbon and / or carbides a locally increased hardness can be achieved. Tungsten, in particular, can also increase wear resistance

Tungsten carbide, and / or other wear-resistant elements can be achieved.

It is also possible to prevent the presence of certain substances in these areas by deliberately not applying the filler material in certain areas. For example, for subsequent welding processes, problematic alloy elements, such as nickel, can be left out of areas of the objects to be welded or can be arranged only where they are needed.

In one embodiment of the method, the object is sintered. It can be released beforehand. In particular, the sintering takes place at a temperature between 70% and 90% of the melting temperature of the powdery material or of the powdery material with any alloying elements present, for example about 80% of the

Melting temperature.

The joint printing by means of a print head enables particularly simple and inexpensive production, since only one movement device for moving the Printhead is needed. The achievable accuracies are particularly high because the distance between the discharge openings is constant.

An embodiment of the method for the generative production of at least one

The object is characterized in that a separating material is applied as additional material or in addition to the additional material, so that the material composition in the article to be produced at the position of the separating material is changed due to the separating material arranged there in relation to at least one adjacent area. After a sintering process, the object can thus be deliberately divided at this position and in particular has a predetermined breaking point.

The divisibility of the object after the sintering process means dividing or

Separate the item into at least two parts. In particular, at least a first part of the object produced is a support structure for abutting or supporting at least one area of the component actually to be manufactured, and a second part is the same component to be manufactured. The two parts are separated from one another by means of the separating material, so that they are not connected to one another in a sintering process. In the following, the term “object” refers to the generative

Object to be produced, which comprises the “component” and in particular at least one support structure for at least regionally supporting the component in one

subsequent sintering process can include.

The support structure serves in particular for the targeted support of areas of the component to be manufactured during the sintering. In this way, a flow

Shear or deform at least a portion of the body to be manufactured prevented. The green body which has only a low strength before the completion of the sintering process is thus protected against deformation or warping. Cantilevered component areas in particular are protected against gravity-induced deformations.

The changed material composition means a different area

Properties that allow a targeted failure of the object at this point. For example, this can be achieved by a locally reduced strength, so that a predetermined breaking point is created in the object, at which a targeted failure of the object can be achieved by the application of force. An area of increased brittleness can also be produced, for example using carbon, so that the object can be broken by direct force. A further possibility is to use a material which is soluble in a solvent such as water and / or a material with a low material as the separating material To arrange melting point or a low heat resistance, the at

A temperature rise allows a targeted failure.

In addition to the separating material, an additional material can be applied. This can be applied by means of at least a third delivery opening of the print head. In particular, the third discharge opening and the first and / or second

Delivery opening configured in the same way.

This embodiment has the advantage that particularly large and complex components as well as components with any cantilevered areas can be produced, since support structures that are adapted to the respective component geometry can be produced in a targeted, reproducible and automatable manner. These support structures can be tailored directly to the component to be manufactured. They can be produced in the same process as the actual component, so that a quick and efficient process is made available. Through the generative three-dimensional production of the

Support structures of any complex support structures are possible. Because of the light

Detachability of the support structure reduces the post-processing required to a minimum.

In a further embodiment of the method, the separating material is applied in such a way that it forms a phase on the powdery material that is at least substantially free of the powdery material. In other words, the separating material is applied in such a way that at least in some areas there is separating material, but no powdery material.

The phase of the separating material means in particular a layer of the separating material. The phase of the separation material can extend parallel or at any other angle to the layer of the powdery material. In other words, a layer of the separating material can be applied in or onto a layer of the powdery material and / or the separating material can be arranged in regions within a layer of the pulverulent material, so that an upright or obliquely extending phase of the separating material is formed. In particular, at least one further layer of the powdery material is arranged on the separating material. Of course, no further layer of the powdery material is arranged on the last layer.

In this way, mechanical contact between the powdery material already applied and the layer of the powdery material to be subsequently arranged is prevented. In other words, the separating material, which can be arranged, for example, as a layer and in this case is also referred to as a separating layer, separates, the areas of the powder located on both sides thereof or above and below. This has the advantage that in a subsequent sintering process there is no bond between the support structure and the actual component to be produced, and thus the

Support structure is particularly easy and reproducible separable. This enables simple automation of the process.

In one configuration, the object is deliberately divided at the position of the separating material. This is typically done after a sintering process. In particular, a force is exerted on at least one area of the object for this purpose, so that it breaks or divides in the area of the separating material for the purpose of separating the support structure of the object. This can be done automatically. The component actually to be produced is produced by separating the support structure from the manufactured object.

In a further embodiment of the method, the separating material comprises a material and consists in particular of a material which has a melting point which is at least 5% and in particular at least 10% of the melting point of the

powdery material deviates. A bond between the separating material and the powdery material is thus reduced or prevented in a sintering process for producing the article.

For example, the material comprised by the separating material has a melting point which is at least 5%, in particular at least 10%, for example at least 20%, in one embodiment at least 30% and in one example at least 40% higher than the melting point of the powdery material, so that the material comprised by the separating material is not connected to the powdery material. All percentages regarding temperatures refer to a temperature scale in ° C.

Alternatively, the material comprised by the separating material can be one around the mentioned

Percentage values have a lower melting point, so that during sintering there is a liquid phase separating the respective materials.

In other words, the separating material is selected such that the component and the

Do not sinter support structure together. In particular, a ceramic separating material is used. The additional material or the separating material can comprise particles in a suspension. Suspended ceramic particles are typically used.

This configuration has the advantage that the targeted separation of

Support structures are possible in a particularly simple manner by using the materials according to the invention. In addition, the materials that can be used as separating material are available, have good processability and are inexpensive. An embodiment of the method is characterized in that the separating material is liquid, pasty or powdery. For example, the separating material can be applied as a viscous paste. For example, it can comprise ceramic particles. In particular, the separating material in this case forms a phase that is not influenced by the powdery material, so that there is only the separating material in some areas. The

Separating material can also be dispensed onto the powdery material as a powder or as a liquid, for example as a solution or suspension with suspended particles.

A further embodiment of the method for the generative production of at least one object is characterized in that the powdery material and the additional material are arranged in such a way that the additional material is located between areas of the powdery material that are not influenced by the additional material. Thus, a material composition in the article to be manufactured is changed at the position of the additional material in relation to surrounding areas.

For example, a layer can be arranged without a specific additional material, a layer comprising or consisting of the additional material can be arranged on this and a layer without the additional material can in turn be arranged on this. In particular, the additional material is applied to a powder layer and a powder layer is then arranged on the additional material. Additional material can be applied to the last layer to be produced without a powder layer being applied to it.

The additional material can be arranged in a first region, which is arranged along at least one spatial direction between second regions, no additional material being arranged or being arranged in the second regions. The areas can be in one layer. The additional material can thus be arranged within a layer between regions of the powdery material which are not influenced by the additional material.

In the case of a separating material, this can be arranged in or on the same layer and / or in or on different layers as the actual component to be produced and / or the support structure. In particular, it serves to manufacture at least one area of the area to be manufactured which is reduced in strength or toughness

Object.

In the case of an additional material influencing the properties of the object after sintering, a range of changed properties can be produced in a targeted manner in this way. In one embodiment, the areas of the powdery material surrounding the additional material are composed of the powdery material. In other words, the support structure and the component actually to be produced are produced from the same powdery material. For example, a first part of the powder can be used to produce the component and a second part of the powder can be used to produce a support structure for contacting or supporting at least one area of the component, with a layer of the between the first and the second part of the powder

Additional material, for example a separating layer made of the separating material, is arranged.

This has the advantage that, on the one hand, the support structure and component can be produced in a particularly simple and quick manner. In addition, the shrinkage of these elements is the same due to the same material during the sintering process, so that distortion due to shrinkage in the object is prevented and the support structure can fulfill its function during the entire sintering process.

An embodiment of the method is characterized in that a pro

Surface unit of the layer of powdery material applied amount of the additional material is varied so that the object to be produced has different properties in different areas. This can be implemented in one or more layers to be applied.

Different concentrations of the additional material in the article to be produced have different properties in this way. For example, the chemical composition, magnetism, electrical conductivity, hardness, etc. of the object can be set in specific areas.

A quantity means in particular a volume or a mass. The variation takes place in particular during a movement of the print head along the layer of the

powdery material. For example, it means a change in the volume flow of the additional material.

The amount applied per surface unit can be varied continuously, so that a gradient material or a graduated object is produced, that is to say an object that is continuously variable with regard to its composition along at least one spatial direction. The variation can also be discrete or step-wise, possibly with very small steps, so that an object having graduated properties is produced.

This configuration has the advantage that, in particular in connection with the geometric variability of the additive manufacturing process, a particularly large one Freedom in the construction of objects can be achieved. For the specific application, objects with specific areas are defined mechanical

Properties producible. This holds great potential with regard to lightweight construction. Functionally integrated objects can be produced by deliberately influencing the physical or thermo-physical properties, in particular the thermal conductivity.

A further embodiment of the method is characterized in that the

Additional material includes particles and / or fibers. For example, a locally increased hardness or strength of the object to be produced can be produced by fibers.

The particles or fibers in particular have maximum diameters or lengths in the micrometer range, in particular in the nanometer range, so that they are by means of

Delivery openings of the print heads are output. They are typically in suspension. However, as described, it is not excluded that solid particles or fibers can be discharged from a suitable discharge opening.

Particles can, as described, consist of the same or a similar material as the powdery material and have a smaller particle diameter than the particles of the powdery material, so that they are arranged in their spaces in order to increase the density of the green compact and thus the sintering activity and to increase the density of the object to be manufactured.

This configuration advantageously enables greater variability in the setting of desired properties.

A further embodiment of the method is characterized in that the additional material is applied to at least one area of the powdery material in which no binder is applied.

Accordingly, it is also possible to apply additional material to areas of the powder that are not covered by the object to be produced. This can be done, for example, to determine the flow properties of the powder by means known from sintering technology

To improve flow improvers such as, for example, pyrogenic silica and in this way to facilitate the subsequent separation of the non-solidified powder, for example in cavities which are geometrically complicated or have only small cross sections, such as, for example, internal cooling channels. This has the advantage that the constructive freedom for designing the objects that can be produced using the method according to the invention is further increased. Binder can be applied in one or more layers in which no additional material is applied. Additional material can be applied in one or more layers in which no binder is applied.

A second aspect of the invention is the use of a printhead, comprising a plurality of discharge openings for the respective discharge of material, namely at least binder and filler material, for producing an object by means of the method according to the invention.

In particular, at least a first discharge opening of the printhead becomes

Discharge of the binder and at least one second discharge opening of the print head are used to discharge the filler material. In addition, the print head can have at least one further discharge opening for discharging at least one

additional material, for example a further filler material.

In particular, a conventional printhead can be used to match the

to produce at least one object according to the generative method according to the invention.

A third aspect of the invention is a motor vehicle, in particular a passenger car, which comprises at least part of an object produced using the method according to the invention.

In particular, the part of the object is a component in which at least one

Support structure has been removed.

The invention is explained below with reference to the examples shown in the accompanying drawings.

Show it

1: a schematic representation of the method according to the invention, and

2 shows a perspective illustration of a print head for carrying out the method according to the invention.

FIG. 1 schematically shows a device 19 for carrying out the generative method according to the invention for producing an object 20 by means of binder jetting.

A three-part assembly arrangement is shown with a central receiving device 18 for the layered arrangement of the powdery material 22 contained therein

Design is a metal powder. Powder stocks are on both sides of the receiving device 18 23 arranged. A multiplicity of layers (not shown individually) of the powdery material 22 are already arranged on the receiving device 18

is solidified in regions for the production of the object 20 by applying binder 20.

For this purpose, a print head 10 is shown, which is connected to a binder supply 28 by means of a line 29. The print head 10 has not shown here

Delivery openings for the delivery of the binder 20. It is movable parallel to the layers of powdery material 22, the movement being indicated by arrows with the

Reference numeral 30 is shown. The print head 10 additionally has discharge openings (not shown here) for the discharge of an additional material, by means of which it is possible to influence at least some areas of a property of the object 20 to be produced. For this purpose, the print head 10 is connected in terms of flow technology to a supply of the additional material, which can be arranged in a manner analogous to the binder supply 28, that is to say separately from the print head 10, or on or in the print head 10 and together with it.

The article 20 is produced in layers. To make a layer of

The following method steps are carried out on the object 20: The powder stores 23 are defined by a corresponding one according to the arrows shown below

Height unit shifted upwards and the central receiving device 18 is shifted downward according to the arrow shown below by a defined height unit. This takes place in particular in such a way that the volume of the powdery material 22 of the powder stores 23 made available in this way essentially corresponds to the volume that has become free for arranging a layer of the powdery material 22 above the receiving device 18.

By means of the arrangement device 25, a uniform layer of the powdery material 22 is applied to the previously applied layer of the powdery material 22, which is solidified in some areas by means of a binder 27, or distributed thereon. The

The arrangement device 25 is designed as a roller movable along the arrow direction parallel to the surface of the respective layers of the powdery material 22 for distributing and possibly compressing the powdery material 22. In other words, the powdery material 22 is on the receiving device 18 or on one beforehand

applied layer arranged. The print head 10 is then moved over at least part of the surface of the layer along the directions shown by arrows 30 parallel to the surface of the layer and at least by means of the print head 10 Binder 27 applied in areas to solidify the material. The additional material is discharged from the separate discharge opening by means of the print head 10.

In this way, the object 20 is produced, which comprises the component actually to be manufactured and at least one support structure for supporting the component in regions in the subsequent sintering process. This support structure consists of the same pulverulent material 22 as the component, the material of the support structure being spatially separated from the material of the component by means of a separating layer made of a ceramic separating material, so that the two elements do not sinter together and thus, after the sintering process, can be targeted in a simple and automated manner mechanical separation of the component from the support structure is possible.

FIG. 2 shows a perspective view and an enlarged detailed illustration of a print head 10 for use in the method according to the invention. The print head 10 has an enlarged nozzle array 16 with six rows 14, each row 14 having a plurality of discharge openings 12 for the discharge of the respective material. These are arranged one behind the other along the central longitudinal axis of the respective row 14, which is not shown here. The material to be applied is binder and at least one additional material, which can be a separating material, for example. In particular, two rows 14 are provided for dispensing the same material, so that there is a redundant design.

Furthermore, the print head 10 has electrical contacts 40 for controlling the nozzle array

Reference list

Print head 10

Delivery opening 12

Row 14

Nozzle array 16

Recording device 18

Device 19

Item 20

Powdery material 22

Powder supply 23

Arrangement device 25

Binder 27

Binder stock 28

Line 29

Movement 30

Contacts 40

Claims

1. A method for the additive manufacturing of at least one object (20), in which a layer of powdery material (22) is arranged, for solid

Connection of particles of the powdery material (22) for the purpose of producing the object (20), a binder (27) is applied to at least one area of the powdery material (22) and an additional material for at least area-related influencing on at least a area of the powdery material (22) a property of the object (20) to be produced is applied,

characterized in that the binder (27) and the additional material are discharged in at least partially separate flow paths by means of a common print head (10).

2. The method for the additive manufacturing of at least one object (20) according to claim 1, characterized in that a separating material is applied as additional material or in addition to the additional material, so that the

The material composition in the article (20) to be produced at the position of the separating material is changed as a result of the separating material arranged there in relation to at least one neighboring area and the article (20) can be deliberately divided at this position after a sintering process and in particular has a predetermined breaking point.

3. The method for the generative production of at least one object (20) according to claim 2, characterized in that the separating material is applied in such a way that it forms an at least substantially free phase on the powdery material (22) from the powdery material (22),

in particular at least one further layer of the powdery material (22) being arranged on the separating material.

4. The method for the generative production of at least one object (20) according to one of claims 2 and 3, characterized in that the separating material comprises a material, in particular consists of a material which is a

Melting point which deviates by at least 5% and in particular at least 10% from the melting point of the powdery material (22), so that a bond between the separating material and the powdery material (22) is reduced or prevented in a sintering process for producing the article (20) .

5. The method for the generative production of at least one object (20) according to any one of claims 2-4, characterized in that the separating material is liquid, pasty or powdery.

6. The method for the generative production of at least one object (20) according to one of the preceding claims, characterized in that the powdery material (22) and the additional material are arranged such that additional material is located between areas of the powdery material (22) which are not influenced by the additional material , so that a material composition in the article (20) to be produced is changed at the position of the additional material in relation to surrounding areas.

7. The method for the generative production of at least one object (20) according to one of the preceding claims, characterized in that a quantity of the additional material applied per surface unit of the layer of the powdery material (22) is varied, so that the object (20) to be produced is in different areas has different properties.

8. The method for the generative production of at least one object (20) according to one of the preceding claims, characterized in that the

Additional material includes particles and / or fibers.

9. The method for the additive manufacturing of at least one object (20) according to one of the preceding claims, characterized in that the additional material is applied to at least one area of the powdery material (22) in which no binder (27) is applied.

10. Use of a print head (10) comprising a plurality of discharge openings (12) for the respective discharge of material, namely at least binder (27) and filler material, for producing an object (20) by means of the method according to one of claims 1-9.

1 1. Motor vehicle, in particular passenger cars, comprising at least part of one produced by the method according to any one of claims 1-9

Item (20).