DE102020202464A1 - Method for producing a chassis component and such a chassis component - Google Patents

Abstract

The invention relates to a method for producing a chassis component from a fiber-reinforced plastic composite, with a rod-shaped or tubular core (1) and a semi-finished fiber product (2) being made available in a provision step (S11), - in a subsequent rolling step (S12) for simpler and more cost-effective production ) the semi-finished fiber product (2) is rolled around the core (1), whereby a rod-shaped or tubular preform (9) of the chassis component to be produced is formed, Shape is reshaped, whereby a basic shape (10) of the chassis component to be produced is formed, and - in a subsequent injection and / or curing step (S14), the basic shape (10) is impregnated with a plastic matrix and / or cured.

Description

The invention relates to a method for producing a chassis component from a fiber plastic composite and a chassis component produced according to such a method.

Such a method and such a chassis component are from DE 10 2010 049 565 A1 known. According to this, the chassis component is designed as a stabilizer body or a torsion bar spring. With regard to production, braiding and / or wrapping around the component or the later torsion bar spring is described, for example. The use of pre-impregnated fibers, rovings or fiber bundles is explicitly suggested.

As an alternative to the use of pre-impregnated fiber material, braiding or winding dry fibers onto a core is known, the core at the same time having the shape of the component to be produced.

The known methods have the disadvantage that they are usually complex and / or cost-intensive.

It is therefore the object on which the invention is based to further develop a method and / or a chassis component of the type mentioned at the beginning in such a way that production can be simplified and / or implemented more cost-effectively. In particular, an alternative embodiment is to be provided.

The object on which the invention is based is achieved with a method according to claim 1 and by means of a chassis component according to claim 10. Preferred developments of the invention can be found in the subclaims and in the following description.

The method according to the invention is designed for producing a chassis component from a fiber-plastic composite. In particular, the chassis component is designed for use and / or assembly in a chassis of a vehicle, preferably a motor vehicle. In a provision step, a rod-shaped or tubular core and a semi-finished fiber product are provided. In a rolling step that follows the provision step, the semifinished fiber product is rolled around the core. As a result of this or due to the rolling step, a rod-shaped or tubular preform is formed for the chassis component to be produced. In a subsequent reshaping step or subsequent to the rolling step, the preform is reshaped into a shape predetermined by the chassis component to be produced. In this way or by means of the reshaping step, a basic shape of the chassis component to be produced is formed. In particular, a three-dimensional shape of the basic shape corresponds to the three-dimensional shape of the chassis component to be produced. Subsequent to this or after the reshaping step, there is an injection step and / or a curing step. In the injection and / or curing step, the basic shape is impregnated with a plastic matrix and / or cured. In particular, as part of the injection and / or curing step, the basic shape is first impregnated with the plastic matrix and then cured. This produces the chassis component.

The advantage here is that comparatively inexpensive semi-finished fiber products can be used for the preparation step and the subsequent rolling step. This allows the material costs for manufacturing the chassis component to be reduced. Furthermore, the production and / or handling during the production process is simplified, since the semifinished fiber product is first rolled around the rod-shaped or tubular core, as a result of which the rod-shaped or tubular preform is formed. Only then is the preform reshaped as part of the reshaping step into the desired shape for the chassis component to be produced. It is thus possible to dispense with arranging fiber material or fiber semifinished product on a core, which is already in the shape of the chassis component to be produced. As a result, the chassis component can be produced more easily and more cost-effectively.

A prefabricated, dry, in particular flat, fiber textile is preferably used as the semi-finished fiber product. Such a fiber textile can be designed as a fiber scrim, a fiber fabric or a fiber braid. In particular, the semifinished fiber product is a non-pre-impregnated fiber textile. The semifinished fiber product therefore does not have a plastic matrix in the preparation step, in the rolling step and in the reshaping step. Such a dry fiber textile can be handled more easily during the manufacturing process than a pre-impregnated semi-finished fiber product. In addition, prefabricated dry fiber textiles can be procured inexpensively.

In particular, the fiber textile has several layers of interwoven fibers. An orientation of the fibers is preferably specified by means of or on the basis of the semifinished fiber product. The fibers of at least two layers can be oriented at an angle of + 45 ° and -45 ° to a 0 ° orientation. In particular, the 0 ° orientation coincides with a longitudinal axis of the semifinished fiber product and / or a production direction for manufacturing the semifinished fiber product. Alternatively, the fibers can be aligned with at least two layers possible at an angle of 0 ° and 90 ° to the 0 ° orientation. Different combinations of orientations of the fibers can also be implemented in the case of a multilayer design of the semifinished fiber product. For example, a four-layer semifinished fiber product can have fibers with an orientation of 90 °, −45 °, 0 ° and + 45 °. According to a further embodiment, the fibers of at least two layers can be at an angle in a range between + 30 ° and + 60 ° to the 0 ° orientation and / or in a range between -30 ° and -60 ° to the 0 ° - Alignment. In addition, other angular orientations of the fibers are also conceivable. Fibers of the semifinished fiber product can be formed as glass fibers, aramid fibers, carbon fibers or mixtures thereof.

According to a further development, the core has the shape of a straight cylinder, in particular for or in the rolling step. In particular, the core is designed with a straight cylinder jacket surface. Such a straight core can be produced easily and inexpensively. Furthermore, it is easier to wrap the straight core with the semifinished fiber product than with a core that is bent in a complex manner, for example. In particular, the preform is designed in the form of a straight cylinder and / or with a straight cylinder jacket surface. This shape of the preform inevitably results from the wrapping of the straight core with the semi-finished fiber product in the course of the rolling step. Such a straight preform is easy to handle and easy to further process.

According to a further embodiment, the core is designed as a core remaining in the preform, the basic shape and / or in the chassis component. Alternatively, the core can be removed or dissolved as a non-remaining, in particular so-called lost, core after the production of the preform, the basic shape or the chassis component. For example, a rod or tube, in particular made of metal, is used. Such a core can be pulled out of the preform after it has been produced. To roll up the semifinished fiber product, the core can protrude outward over the semifinished fiber product laterally or at two ends facing away from one another.

In particular, the core is formed from fiber strands, a roving, several roving strands, a rubber core, a foam core, a rod and / or a tube.

In the injection and / or curing step, both the semi-finished fiber product surrounding the core and the core itself are preferably impregnated with the plastic matrix and then cured. Alternatively, only the semifinished fiber product can be impregnated with the plastic matrix in the injection and / or curing step and then cured. According to a further alternative, in the injection and / or curing step, the semi-finished fiber product and only an outer area of the core are impregnated with the plastic matrix and then cured. The core preferably remains in the chassis component to be produced or in the produced chassis component. In this way, the core is not lost in the course of the manufacturing process, but becomes part of the chassis component.

According to a further development, the core is deformable, in particular bendable, and at the same time dimensionally stable. In particular, the core is sufficiently dimensionally stable that the core can be transported without changing its shape or form. Due to the deformable and at the same time dimensionally stable core, the basic shape retains its shape after the deformation step. In particular, the core is sufficiently dimensionally stable that the basic shape can be further processed without the risk of an undesired change in its shape or form.

According to a further embodiment, in the rolling step, an edge of the semifinished fiber product is brought up to the core at right angles or at right angles to the longitudinal axis of the rod-shaped or tubular core and the semifinished fiber product is rolled around the core, beginning with the edge. In particular, the semifinished fiber product has a rectangular shape or a rectangular blank. The semifinished fiber product is preferably rolled around the core in several layers. In order to wind up the semifinished fiber product, the core can be set in a rotational movement about its longitudinal axis.

The semifinished fiber product is preferably fixed, in particular glued and / or clamped, to the core in the rolling step. For this purpose, the semifinished fiber product and / or the core, in particular an outer side or jacket surface of the core, can have an adhesive layer. The fixing ensures that the semifinished fiber product does not become detached from the core after it has been wrapped around it. This ensures an undesired detachment of the semifinished fiber product from the core and thus reproducible further processing of the preform and / or basic shape. In particular, an end or edge of the semifinished fiber product facing away from the core is fixed, in particular glued, to the semifinished fiber product that has already been rolled up. This ensures that the rolled up semifinished fiber product does not unroll again.

According to a further development, the reshaping step is carried out outside of an injection and / or curing tool. Then the basic shape produced as a result of the deformation of the preform is inserted into the injection and / or curing tool. As an alternative to this, the reshaping step for forming the basic shape can be performed during Insertion of the preform into the injection and / or curing tool take place. In the first variant, the core can be deformable and at the same time dimensionally stable in order to ensure further processing of the basic shape or insertion of the basic shape into the injection and / or curing tool without changing the shape. In contrast, the aforementioned second variant can dispense with a deformable and at the same time dimensionally stable core. Here, the reshaping to form the basic shape only takes place when the preform is inserted into the injection and / or curing tool, the basic shape then being stabilized by means of the injection and / or curing tool itself. Alternatively, the already generated basic shape can be arranged in a receptacle designed to correspond to the shape of the basic shape. By means of a suitably designed gripper device, the basic shape can be arranged in the injection and / or curing tool while maintaining its shape.

According to a further embodiment, several, in particular different, semi-finished fiber products are provided in the provision step. In the subsequent rolling step, the several semi-finished fiber products are rolled around the core together or one after the other. Different semi-finished fiber products can be rolled around different sections of the core. Alternatively, at least one semifinished fiber product with a structure that changes over its width can be used. In particular, the width of the semifinished fiber product extends in the longitudinal direction of the core. Thus, a single semifinished fiber product can, for example, have different fiber orientations, fiber layers and / or fiber contents distributed over its width. As a result, for example, depending on an expected load on the chassis component, certain sections or areas of the chassis component can be reinforced.

A chassis component which is produced according to the method according to the invention is of particular advantage. In particular, the chassis component is implemented as a curved stabilizer body which forms a torsion spring and / or a spiral spring. Such a stabilizer body is also referred to as a torsion bar spring. Such a stabilizer body or such a torsion bar spring is generally known in automotive engineering, in particular in chassis construction, for use as a roll stabilizer. These are components which can be subjected to torsion and / or bending and which reduce the rolling movements of a vehicle. In order to stabilize the roll structure of motor vehicles, stabilizers designed in this way can be arranged between the wheels on an axle of a motor vehicle. If the wheels of an axle are deflected alternately, the stabilizer, the stabilizer body or the torsion bar spring distributes the axle load and thus ensures an even axle load distribution. In this way, the driving behavior of a motor vehicle can be positively influenced in such a way that, for example, the coefficient of adhesion of the wheels arranged on an axle can always be kept almost identically at a good level.

The free ends of known stabilizer bodies can usually each be arranged and / or supported via a pendulum support on a separate component, for example a wheel-guiding element such as a wheel carrier or a wheel-guiding link.

In particular, the chassis component produced according to the method according to the invention is a chassis component according to the invention as described above. The method is preferably developed in accordance with the configurations explained in connection with the chassis component according to the invention described here. Furthermore, the chassis component described here can be developed in accordance with the configurations explained in connection with the method.

• 1 ein schematisches Ablaufdiagramm eines erfindungsgemäßen Verfahrens,
• 2 eine schematische Draufsicht auf einen bereitgestellten stabförmigen Kern und ein Faserhalbzeug zum Ausbilden eines erfindungsgemäßen Fahrwerkbauteils,
• 3 eine schematische Draufsicht einer Vorform zum Ausbilden eines erfindungsgemäßen Fahrwerkbauteils, und
• 4 eine schematische Draufsicht einer Grundform zum Ausbilden eines erfindungsgemäßen Fahrwerkbauteils.

The invention is explained in more detail below with reference to the figures. Here, the same reference symbols relate to the same, similar or functionally identical components or elements. Show it:

• 1 a schematic flow diagram of a method according to the invention,
• 2 a schematic plan view of a provided rod-shaped core and a semi-finished fiber product for forming a chassis component according to the invention,
• 3 a schematic plan view of a preform for forming a chassis component according to the invention, and
• 4th a schematic plan view of a basic shape for forming a chassis component according to the invention.

1 shows a schematic flow diagram of a method according to the invention. After starting the procedure according to step S10 takes place according to step S11 a provision step in which a rod-shaped or tubular core and a semi-finished fiber product are provided. The core has the shape of a straight cylinder and a prefabricated dry fiber fabric with a predetermined fiber orientation is used as a semi-finished fiber product.

Then takes place in the following step S12 a rolling step in which the semi-finished fiber product is turned over the core is rolled to form a rod-shaped or tubular preform. At the same time, the semifinished fiber product is fixed to the core, for example by means of an adhesive layer.

This is done according to step S13 a reshaping step in which the preform is reshaped to form a basic shape. Here, the three-dimensional shape of the basic shape corresponds to the predetermined three-dimensional shape of the chassis component to be produced.

In a subsequent step S14 an injection and / or curing step takes place. Here, the basic shape is first impregnated with a plastic matrix and then cured. As a result, the desired chassis component is produced and the method is carried out in accordance with step S15 completed.

In this exemplary embodiment, the basic shape is used for the injection and / or curing step S14 inserted into a suitably designed injection and / or curing tool.

2 shows a schematic plan view of a provided rod-shaped core 1 and a semi-finished fiber product 2 according to the deployment step S11 after 1 for forming a chassis component according to the invention, not shown in detail here. The core 1 is designed in the shape of a straight cylinder. In other words, the core has 1 a longitudinal axis 3 on to which the core 1 Is designed to be rotationally symmetrical. In this embodiment, the core is 1 formed from a deformable or bendable and at the same time dimensionally stable material.

The semi-finished fiber product 2 is designed as a prefabricated dry fiber scrim. In this embodiment, the fiber is semi-finished 2 formed from at least two layers, with fibers 4th a first layer at an angle of + 45 ° and fibers 5 a second layer at an angle of -45 ° to a 0 ° orientation along the axis 6th are aligned. For a better overview, not all fibers are shown 4th , 5 provided with a reference number and shown here only schematically.

The semi-finished fiber product 2 has a rectangular shape in this embodiment. An edge 7th of the semi-finished fiber product 2 is the core 3 facing. Here is the edge 7th parallel to the longitudinal axis 3 of the core 1 aligned. To perform the scroll step S12 after 1 becomes the edge 7th of the semi-finished fiber product 2 according to arrow 8th perpendicular to the longitudinal axis 3 of the core 1 to the core 1 introduced. Then the semi-finished fiber is starting with the edge 7th around the core 1 rolled. The core is used for winding 1 in a rotational movement around its longitudinal axis 3 offset. The core 1 or the semi-finished fiber product 2 can have an adhesive layer by means of which the semifinished fiber product 2 at the core 1 is fixed.

3 Figure 3 shows a schematic top view of a preform 9 for forming a chassis component according to the invention. The preform 9 is after the semi-finished fiber product has been wound up 2 to the core 1 according to 2 educated. The preform thus exists 9 from the core 1 and semi-finished fiber products 2 . The preform 9 has the shape of a straight cylinder. This shape is due to the formation of the core 1 according to 2 given. In this embodiment, the fiber is semi-finished 2 in several layers around the core 1 rolled.

4th shows a schematic plan view of a basic shape 10 for forming a chassis component according to the invention. The basic form 10 is made by means of the preform 9 according to 3 formed, the preform 9 according to 2 into a shape predetermined by the chassis component to be produced in the deformation step S13 according to 1 is reshaped. Because of the deformable and at the same time sufficiently dimensionally stable core in this exemplary embodiment 1 can be the basic form 10 can be further processed without the risk of changing the shape.

In this embodiment, the basic shape is 10 for the subsequent injection and / or curing step S14 according to 1 into an injection and / or curing tool that is only indicated schematically here 11 inserted. In the injection and / or curing tool 11 becomes the basic form 10 initially impregnated with a plastic matrix. The plastic matrix is then placed in the injection and / or curing tool 11 hardened. The desired chassis component is thereby formed.

As an alternative to the embodiment described above, the preform 9 according to 3 into the injection and / or curing tool 11 are inserted, whereby when inserting the preform 9 at the same time the reshaping step S13 to form the basic shape 10 he follows. This means that it is not necessary that the core 1 is formable and at the same time sufficiently dimensionally stable.

List of reference symbols

1

core

2

Semi-finished fiber products

3

Longitudinal axis

4th

Fiber (+ 45 °)

5

Fiber (- 45 °)

6th

Axis (0 °)

7th

edge

8th

arrow

9

Preform

10

Basic form

11

Injection and / or curing tool

S10

begin

S11

Deployment step

S12

Roll step

S13

Forming step

S14

Injection and / or curing step

S15

end

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102010049565 A1 [0002]

Claims (10)

Method for producing a chassis component from a fiber plastic composite, wherein - a rod-shaped or tubular core (1) and a semi-finished fiber product (2) are provided in a provision step (S11), - In a subsequent rolling step (S12), the semifinished fiber product (2) is rolled around the core (1), whereby a rod-shaped or tubular preform (9) of the chassis component to be produced is formed, - In a subsequent reshaping step (S13), the preform (9) is reshaped into a shape predetermined by the chassis component to be produced, whereby a basic shape (10) of the chassis component to be produced is formed, and - In a subsequent injection and / or curing step (S14), the basic shape (10) is impregnated with a plastic matrix and / or cured. Procedure according to Claim 1 , characterized in that a prefabricated dry, in particular not pre-impregnated, fiber textile is used as the semi-finished fiber product (2), in particular the fiber textile has several layers of interconnected fibers (4, 5), preferably the fibers (4, 5) are at least two positions - at an angle of + 45 ° and -45 ° to a 0 ° -orientation or - in a range between + 30 ° and + 60 ° to the 0 ° -orientation and / or - in a range between -30 ° and -60 ° aligned to the 0 ° orientation. Procedure according to Claim 1 or 2 , characterized in that the core (1) and / or the preform (9) is designed in the shape of a straight cylinder and / or with a straight cylinder jacket surface. The method according to any one of the preceding claims, characterized in that the core (1) is formed as a remaining core (1) in the preform (9), the basic shape (10) and / or in the chassis component or the core (1) as a non-remaining, in particular lost, core (1) is removed or dissolved after the production of the preform (9), the basic shape (10) or the chassis component; Roving strands, a rubber core, a foam core, a rod and / or a tube are used. Method according to one of the preceding claims, characterized in that the core (1) is deformable, in particular bendable, and at the same time dimensionally stable, whereby the basic shape (10) retains its shape after the deformation step (S13), in particular the core (1) remains in the chassis component. Method according to one of the preceding claims, characterized in that in the rolling step (S12) an edge (7) of the, in particular rectangular, semi-finished fiber product (2) transversely or at right angles to the longitudinal axis (3) of the rod-shaped or tubular core (1) on the core (1) and the semifinished fiber product (2) is rolled starting with the edge (7) around the core (1), in particular the core (1) is set in a rotational movement about its longitudinal axis (3) for winding the semifinished fiber product (2) . Method according to one of the preceding claims, characterized in that in the rolling step (S12) the semi-finished fiber product (2) is fixed, in particular glued and / or clamped, to the core (1). Method according to one of the preceding claims, characterized in that the reshaping step (S13) is carried out outside an injection and / or curing tool (11) and then the basic shape (10) generated due to the reshaping of the preform (9) into the injection and / or the curing tool (11) is inserted, or the reshaping step (S13) for forming the basic shape (10) takes place when the preform (9) is inserted into the injection and / or curing tool (11). Method according to one of the preceding claims, characterized in that in the provision step (S11) several, in particular different, semi-finished fiber products (2) are provided and in the subsequent rolling step (S13) are rolled, preferably rolled, around the core (1) together or in succession Rolled around different sections of the core (1) different semi-finished fiber products (2) and / or at least one semi-finished fiber product (2) with a structure that changes over its width. Chassis component produced according to a method according to one of the preceding claims, wherein the chassis component is implemented as a curved stabilizer body which forms a torsion spring and / or a spiral spring.

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