Method and tool device for manufacturing a component having a tooth profile

Abstract

The invention relates to a method for producing a component (10) with a tooth profile (5), in which in a first step a component blank (1) is inserted into a mounting part (2) of a tool device (4) to receive a pressing force during a movement of a pressing part (3) of the tool device (4) in a vertical movement direction (V), and in a second step the tooth profile (5) is pressed into the component blank (1) using a rotating body (7) connected to the pressing part (3) via a joint rod (8), and when the pressing part (3) is moved in the movement direction (V), the rotating body (7) is pressed towards the component blank (1) and rolls along the component blank (1), thereby forming the tooth profile (5). Additionally, the invention relates to a tool device (4) for producing a component (10).

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a component / transmission component with a tooth profile, preferably a gear rack, the component further preferably configured as a steering rod to be used in motor vehicles (for example in a steering gear). [Background technology]

[0002] Various cold forming methods are already known, in which in general the component to be machined is held between at least two spaced apart components of a rolling tool and shaped according to its geometric shape, examples of which are known from DE 1 237 051 A1, US 716 241 and US 2 782 663.

[0003] However, in the case of the methods known from the prior art, it has been found that the tool devices used and the methods used for manufacturing the toothed components are implemented in a relatively complex manner. Summary of the Invention [Problem to be solved by the invention]

[0004] It is therefore an object of the present invention to produce a tooth profile on a component using the simplest means possible. [Means for solving the problem]

[0005] This is achieved according to the invention by the subject matter of claim 1. Thus, a method for producing a component with a tooth profile is claimed, in which in a first step a) a component blank is inserted into a mounting part of a tool device in order to receive a pressing force when a press part of the tool device moves in a vertical movement direction, and in a second step b) the tooth profile is pressed into the component blank using a rotating body coupled to the press part via a joint rod (in the sense of a connecting rod / conrod), which is pressed towards the component blank and rolls along it during the movement of the press part in the movement direction such that the tooth profile is formed.

[0006] This object is therefore achieved by a tool device according to the invention by the subject matter of claim 9, the claimed tool device being configured to produce a component having a tooth profile, a vertically movable press part, a mounting part prepared to receive a component blank, a rotating body and a joint rod connecting the rotating body to the press part in such a way that when the press part moves vertically to form the tooth profile, the rotating body is pressed towards the component blank and rolls along the outer periphery of the component blank / component blank.

[0007] Such production of the tooth profile means that as few components as possible are required for the finish forming of the component. On the one hand, this significantly simplifies the construction of the tool device, and on the other hand, the manufacturing process is implemented as efficiently as possible. In particular, to implement a different toothing, preferably only the rotating body has to be exchanged.

[0008] Further advantageous embodiments are claimed with the dependent claims and are explained in more detail below.

[0009] It is therefore also advantageous if the rotating body has the negative of the tooth profile directly (preferably on the radially outer side of the rotating body), which further simplifies the construction, the tooth profile being pressed into the component blank by directly pressing the rotating body against the component blank.

[0010] Furthermore, it is advantageous if the tool device is implemented as a progressive tool / progressive press, as a result of which particularly precise tooth profiles are formed.

[0011] If the progressive tool is configured such that the tooth profile is formed in several stages, manufacturing efficiency is improved.

[0012] It is therefore also advantageous if the tooth profile is formed in a number of cold forming stages, each cold forming stage having a rotating body which is connected to the pressing part via a joint rod, which further increases the manufacturing efficiency.

[0013] In this respect it is also advantageous if the rotating bodies of the various cold forming stages differ with regard to tooth diameter and / or tooth depth.

[0014] If the component blank is elongated, for example a gear rack blank, and is inserted in a first step at an angle (with the longitudinal axis of the component blank) to the vertical movement direction of the press, the rotating body can roll along the component blank with as little wear as possible.

[0015] It is also advantageous if the component blank is inserted in the first step a) at an angle of 20° to 50°, preferably 25° to 35°, i.e. approximately 30°, to a horizontal plane (relative to the longitudinal axis of the component blank), this horizontal plane being perpendicular to the vertical direction of movement of the pressing part. As a result, the rotating body is received on the joint rod with as little wear as possible.

[0016] It is also advantageous if the rotating body is guided in a housing with a rolling movement of the rotating body, the housing being further preferably connected to a base part which receives the mounting part. This results in a rigid mounting of the rotating body.

[0017] In this respect it is also advantageous if the rotating body is connected to the joint rod by a bearing shaft and / or guided in the housing (preferably at an angle to the vertical direction of movement of the pusher).

[0018] If the rotating body is advantageously implemented as a roller and has the negative of the tooth profile on only a portion of its circumference, the rotating body can be supported as rigidly as possible.

[0019] More preferably, the rotor is configured to form an irregular tooth profile.

[0020] In other words, according to the invention, the cold-formed gear rack is preferably produced in a multi-stage tool, the tooth profile is produced by rolling forming rollers, the vertical movement of the press is converted into a rolling movement via a connecting rod, so that there is a profile unrolled by the rollers, which is then pressed into the workpiece, the rollers being moved via a type of connecting rod.

[0021] In the following, the invention is explained in more detail with reference to the drawings. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 shows a partially illustrated side view of a tool device constructed and used in accordance with the present invention according to a preferred exemplary embodiment, in which a rotating body inserted into the tool device and a joint rod connecting the rotating body to a vertically movable pressing part are clearly visible. [Diagram 2]2 shows a detailed perspective view of the machining tool according to FIG. 1 in the region of the rotating body and a component blank to be machined with the rotating body; [Diagram 3] FIG. 2 shows a perspective view of a gear rack produced by the tool device according to FIG. 1 . [Figure 4] 2 shows a schematic flow chart for implementing a fabrication method according to the invention using a tool device according to FIG. 1; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] These figures are merely schematic in nature and serve only for the understanding of the invention, and the same elements are given the same reference symbols.

[0024] 3 shows a component 10 in the form of a gear rack completely manufactured using the method according to the invention. The component 10 is in particular implemented as a steering rod and is therefore preferably used in steering systems of motor vehicles. In a further embodiment according to the invention, however, the component 10 is also implemented as another component 10 configured with a tooth profile 5, for example as a gear wheel.

[0025] In the present embodiment, the finished component 10, as a gear rack, has a tooth profile 5 in longitudinal section due to the configuration of the component 10, which is shown as a helical toothing in this figure 3. However, in figures 1 and 2 the tooth profile 5 is shown as a straight toothing, and in principle the most diverse toothing / tooth profiles 5, preferably also irregular tooth profiles 5, can be implemented using the manufacturing method described below.

[0026] Figures 1 and 2 illustrate a tool device 4 configured for implementing the method according to the invention, by means of which a component 10 according to figure 3 can be manufactured. The tool device 4 is implemented as a progressive tool / progressive press. The manufacturing stages can be seen in figure 1.

[0027] 1 shows that the tool device 4 has a base part 14 that defines / extends in a horizontal plane 12. The pressing part 3 can move in a vertical movement direction V relative to the base part 14, i.e. orthogonal to the horizontal plane 12. When the tool device 4 is in operation, the movement of the pressing part 3 generates / transmits a forming force that forms the tooth profile 5.

[0028] The mounting part 2, which is configured to support the pressing force transmitted by the pressing part 3, is received on the base part 14. The mounting part 2 is also configured in such a way that the component blank 1 to be produced (here in the form of a gear rack blank) can be clamped at an angle to the direction of movement V and is already clamped in this position in Fig. 1. In the clamped state of the component blank 1 shown in Fig. 1, this component blank 1 is clamped / inserted inclined with respect to its longitudinal axis 15 at an angle 11 of 30° to the horizontal plane 12.

[0029] To form the tooth profile 5 by cold forming, a rotating body 7 in the form of a roller having a negative 6 of the tooth profile 5 is provided. The rotating body 7 is rotatably supported at one end of a joint rod 8 inserted according to a connecting rod. The joint rod 8 serves to couple the movement of the rotating body 7 to the pressing part 3. The joint rod 8 is therefore rotatably attached to the pressing part 3 at its end opposite to the rotating body 7.

[0030] Furthermore, the rotating body 7 is guided in the housing 9 of the tool device 4 such that it is movable along the longitudinal axis 15 of the clamped component blank 1. In this respect, as can be seen, for example, in Fig. 2, the rotating body 7 is received on a bearing shaft 13 which is guided in the housing 9 with an area of ​​the bearing shaft 13 protruding from the rotating body 7 and which is also attached to the joint rod 8.

[0031] It has proven to be particularly advantageous if the joint rod 8 is configured with two arms, one arm being mounted on each side of the rotor 7 on a bearing shaft 13 .

[0032] Thus, according to the invention, the rotary body 7 is held on the pressing part 3 via the joint rods 8 in such a way that a vertical movement of the pressing part 3 (movement along the movement direction V) results in a direct pressing of the rotary body 7 onto / at the component blank 1 by the negative form 6 (also called negative profile) of the rotary body 7 and thus the tooth profile 5 is pressed in by cold forming. At the same time, the rotary body 7 rolls along the movement direction V along the component blank 1 during the movement of the pressing part 3.

[0033] The method according to the invention is illustrated diagrammatically in Fig. 4. In a first step a), the component blank 1 is clamped / inserted into the mounting part 2. Subsequently, in a second step b), the tooth profile 5 is formed in the manner already described. The tooth profile 5 is thus formed by moving the pressing part 3 towards the component blank 1 and thus pressing the rotary body 7 onto the component blank 1.

[0034] In this context, it should be pointed out that the tooth profile 5 is preferably formed in several individual manufacturing / cold forming stages. In this case, rotating bodies 7 of different dimensions are preferably inserted in several stations / cold forming stages (located behind or in front of the drawing plane of FIG. 1), which rotating bodies 7 are connected to the pressing part 3 via corresponding joint rods 8. The rotating bodies 7 differ, in particular, in the tooth diameter or tooth depth of their negative moulds 6. As a result, in a first partial step, the tooth profile 5 is preferably produced with a first depth, and in at least one further second step, the tooth profile 5 is further formed / produced with a second depth. Any number of cold forming stages can thus be implemented until finally the component 10 according to FIG. 3 is completed and removed from the tool device 4 in step c). [Explanation of symbols]

[0035] 1 Component Blank 2. Mounting part 3 Pressing part 4 Tool Device 5 Tooth profile 6 Negative type 7 Rotating Body 8 Joint Rod 9. Housing 10 Components 11 angles 12 horizontal plane 13 Bearing shaft 14 Base section 15 Longitudinal axis V vertical motion direction

Claims

1. 1. A method for the production of a component (10) having a tooth profile (5), comprising: in a first step, a component blank (1) is inserted into a mounting part (2) of a tool device (4) for receiving a pressing force when a pressing part (3) of the tool device (4) is inserted in a vertical movement direction (V); and in a second step, the tooth profile (5) is pressed into the component blank (1) using a rotating body (7) connected to the pressing part (3) via a joint rod (8), the rotating body (7) being pressed in the direction (R) of the component blank (1) and rolling along the component blank (1) during a movement of the pressing part (3) in the movement direction (V) such that the tooth profile (5) is formed.

2. 2. A method according to claim 1, characterized in that the rotating body (7) has, preferably on its outer periphery, a negative (6) of the tooth profile (5).

3. 3. The method according to claim 1 or 2, characterized in that the tool device (4) is implemented as a progressive tool.

4. 4. The method according to claim 1, wherein the tooth profile (5) is formed in several cold forming stages, each cold forming stage having a rotating body (7) connected to the pressing part (3) via a joint rod (8).

5. 5. A method according to claim 4, characterized in that the rotary bodies (7) of the various cold forming stages differ with respect to tooth diameter and / or tooth depth.

6. The method according to any one of the preceding claims, characterized in that the component blank (1) is elongated and is inserted in the first step at an angle to the vertical movement direction (V) of the pressing part (3).

7. The method according to any one of the preceding claims, characterized in that in the first step, the component blank (1) is inserted at an angle (11) between 20° and 50° with respect to a horizontal plane (12).

8. Method according to any one of the preceding claims, characterized in that the rotating body (7) is guided in a housing (9) with a rolling movement of the rotating body (7).

9. 1. A tool device (4) for producing a component (10) having a tooth profile (5), the tool device (4) comprising a vertically movable press part (3), a mounting part (2) arranged to receive a component blank (1), a rotating body (7) and a joint rod (8) connecting the rotating body (7) to the press part (3) in such a way that the rotating body (7) is pressed in the direction of and rolls along the component blank (1) when the press part (3) moves vertically to form the tooth profile (5).

10. Tool device (4) according to claim 9, characterized in that the rotating body (7) is connected to the joint rod (8) and / or guided in the housing (9) by a bearing shaft (13).

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