Extrusion part, brake pressure generator, vehicle and method for producing an extrusion part

Abstract

The invention relates to an extrusion part (1) comprising an axial end portion having an outer contour (2), wherein the axial end portion has a recess (3) located in an axial end face of the extrusion part (1), wherein the recess (3) and the outer contour (2) overlap one another in an axial direction of the extrusion part (1).

Description

[0001] R. 417062

[0002] - 1 -

[0003] Description

[0004] Title:

[0005] Flow-formed part, brake pressure generator, vehicle and method for manufacturing a flow-formed part

[0006] The present invention relates to a flow-formed part, a brake pressure generator, a vehicle and a method for manufacturing a flow-formed part.

[0007] State of the art

[0008] DE 20 2015 003 147 U1 shows a machine tool for cold forming.

[0009] DE 10 2012 100 850 A1 discloses a nut and a method for manufacturing a nut.

[0010] Disclosure of the invention

[0011] The core of the invention for the extrusion part, comprising an axial end section with an outer contour, consists in the fact that the axial end section has a recess which is arranged in an axial end surface of the extrusion part, wherein the recess and the outer contour overlap each other in an axial direction of the extrusion part.

[0012] The background of the invention is to improve the component accuracy of the extrusion part. By introducing a recess in the center of the affected area or on the opposite side, additional material is displaced, thereby distributing the pressure build-up more evenly during forming. This is achieved through repeated re-insertion in R. 417062.

[0013] - 2 -

[0014] The recess allows material to be pressed into the counter-mold, for example into the outer tool half, thereby achieving a more accurate reproduction of the outer contour and vice versa.

[0015] Advantageously, the recess completely overlaps the outer contour in the axial direction.

[0016] Further advantageous embodiments of the present invention are the subject of the dependent claims.

[0017] According to an advantageous embodiment, the recess is arranged centrally in the axial end face of the extrusion part. This enables a uniform distribution of the material during forming.

[0018] It is also advantageous if the outer contour has a variable cross-section, particularly if round and straight sections alternate. This allows the extruded part to be connected to other components via a positive fit and / or friction fit.

[0019] It is advantageous if the extrusion part and / or the recess is essentially cylindrical.

[0020] According to a further advantageous embodiment, the recess has a conical bottom section, in particular wherein the conical bottom section has an angle between 140° and 160°, and / or wherein a transition from the conical bottom section to a cylindrical area of ​​the recess has a radius of at least 0.5 mm. This enables a more uniform distribution of the material during forming, thereby further improving the component accuracy of the extruded part.

[0021] Furthermore, it is advantageous if the distance between the outer contour and the recess is smaller than the radius of the recess. The distance between the outer contour and the recess is advantageously minimized so that the extruded part has the minimum required stability. R. 417062

[0022] - 3 - while simultaneously maximizing component accuracy. This also results in material savings and a consequent weight reduction.

[0023] The core of the invention in the brake pressure generator consists in the fact that the brake pressure generator has a flow-formed part as described above or according to one of the claims relating to the flow-formed part, in particular wherein the flow-formed part functions as a pressure rod.

[0024] The background of the invention is that the increased component accuracy of the extrusion part or the push rod enables a secure positive locking and / or friction locking connection of the extrusion part with other components of the brake pressure generator, thereby improving the operational reliability of the brake pressure generator.

[0025] The core of the invention in the vehicle consists in the fact that the vehicle has a braking system as described above or according to the claim relating to the braking system.

[0026] The core of the invention in the method for producing a flow-formed part, in particular as described above or according to one of the claims relating to the flow-formed part, consists in the fact that the method comprises the following process steps, wherein in a first process step a material blank is inserted between a die and a punch, wherein in a second process step the material blank is pressed onto the die by means of the punch, and wherein in a third process step the punch is pressed onto the die at least once more.

[0027] The invention aims to improve the component accuracy of the extruded part. By creating a recess in the center of the affected area or on the opposite side, additional material is displaced, resulting in a more even distribution of pressure build-up during forming. Repeated repositioning within the recess allows material to be pressed into the counter-mold, for example, the outer mold half, thereby achieving a more accurate reproduction of the outer contour, and vice versa. R. 417062

[0028] - 4 -

[0029] Advantageously, in the third process step, the stamp is repeatedly pressed onto the die.

[0030] The above embodiments and further developments can be combined with one another as appropriate. Further possible embodiments, further developments, and implementations of the invention also include combinations of features of the invention described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

[0031] Brief description of the drawings

[0032] The following section explains the invention with reference to exemplary embodiments, from which further inventive features may emerge, but to which the scope of the invention is not limited. These exemplary embodiments are illustrated in the drawings.

[0033] Fig. 1 Three-dimensional oblique view of an extrusion part 1 according to an embodiment of the invention,

[0034] Fig. 2 shows a sectional view of the extrusion part 1 and

[0035] Fig. 3 shows a schematic flow diagram of a method according to the invention for producing a flow-formed part 1.

[0036] Figure 1 shows an axial end section of the extrusion part 1 according to the invention. The extrusion part 1 is essentially cylindrical and has an outer contour 2 on its outer circumference at an axial end section.

[0037] The outer contour 2 extends from an axial end of the R. 417062

[0038] - 5 -

[0039] extrusion part 1 in the axial direction of extrusion part 1 and surrounds extrusion part 1 in the circumferential direction.

[0040] The outer contour 2 has a variable cross-section. It alternates between round sections with a constant radius and straight sections whose normal vectors extend radially.

[0041] In the region of the outer contour 2, the axial end section has a recess 3. The recess 3 is centered in an axial end surface of the extruded part 1. The recess 3 is, for example, cylindrical and / or blind. The distance between the outer contour 2 and the recess 3 is less than the radius of the recess 3.

[0042] The recess 3 has a bottom section 4 with a radius decreasing in the axial direction, in particular a conical bottom section 4. The conical bottom section 4 has an angle between 140° and 160°. The transition from the conical bottom section 4 to a cylindrical area of ​​the recess 3 has a radius of at least 0.5 mm. The lowest point of the bottom section 4 is located on an axis, in particular a rotational axis, of the extrusion part 1.

[0043] The extrusion part 1 is made of metal, in particular as a steel part.

[0044] The extrusion part 1 can be used, for example, as a push rod in a brake pressure generator. The push rod can be positively and / or frictionally connected to other components of the brake pressure generator, such as a spindle drive unit, by means of the outer contour 2.

[0045] Fig. 3 shows a method 100 according to the invention for producing a flow-formed part 1 .

[0046] In the first process step 101, a material blank is inserted between a die and a punch. R. 417062

[0047] - 6 -

[0048] In a second process step 102, the raw material is pressed onto the die using the punch. The raw material is then brought into the desired shape by means of cold forging.

[0049] In a third process step 103, the stamp is repeatedly applied several times.

[0050] In a fourth process step 104, the finished extrusion part 1 is removed.

Claims

R. 417062 - 7 - Claims 1. Flow-formed part (1) comprising an axial end section with an outer contour (2), characterized in that the axial end section has a recess (3) which is arranged in an axial end surface of the flow-formed part (1), wherein the recess (3) and the outer contour (2) overlap each other in an axial direction of the flow-formed part (1).

2. Flow-formed part (1) according to claim 1 , characterized in that the recess (3) is arranged centrally in the axial end surface of the flow-formed part (1).

3. Flow-formed part (1) according to one of the preceding claims, characterized in that the outer contour (2) has a variable cross-section, in particular wherein round sections and straight sections alternate.

4. Flow-formed part (1) according to one of the preceding claims, characterized in that the flow-formed part (1) and / or the recess (3) is substantially cylindrical.

5. Flow-formed part (1) according to one of the preceding claims, characterized in that the recess (3) has a conical bottom section (4), in particular wherein the conical bottom section (4) has an angle between 140° and 160°, R. 417062 - 8 - and / or wherein a transition from the conical bottom section (4) to a cylindrical area of ​​the recess (3) has a radius of at least 0.5 mm 6. Flow-formed part (1) according to one of the preceding claims, characterized in that a distance between the outer contour (2) and the recess (3) is smaller than a radius of the recess (3).

7. Brake pressure generator comprising a flow-formed part (1) according to one of the preceding claims, in particular wherein the flow-formed part (1) functions as a push rod.

8. Vehicle comprising a brake pressure generator according to claim 7.

9. Method for producing a flow-formed part (1), in particular according to one of claims 1 to 6, wherein in a first process step (101) a material blank is inserted between a die and a punch, wherein in a second process step (102) the material blank is pressed onto the die by means of the punch, wherein in a third process step (103) the punch is pressed onto the die at least once more.

Images