Modular Forming Tool, Modular Forming Tool Set and Method for Producing Substantially Rotationally Symmetrical Parts

Abstract

Modular forming tool (1), in particular pressing tool, preferably for producing essentially rotationally symmetrical parts, comprising at least one primary tool (10), in particular a core, at least one reinforcing tube (30) and at least one auxiliary tool (50), the forming tool (1) extending along a longitudinal extension direction (L), the primary tool (10) having a workpiece machining surface (12), a sheath surface (14) and two end surfaces (16), the workpiece machining surface (12) contacting or being designed to contact a workpiece, the sheath surface (14) delimiting the primary tool (10) in a radial direction (R), wherein the end surfaces (16) delimit the primary tool (10) in the longitudinal extension direction (L), wherein the reinforcing tube (30) has an inner sheath surface (32) and an outer sheath surface (34), wherein the primary tool (10) is pressed into the reinforcing tube (30) indirectly and/or directly via the sheath surface (14), so that the primary tool (10) is secured relative to the reinforcing tube (30) in the radial direction (R), wherein the inner sheath surface (32) and the outer sheath surface (34) each have an interference fit, wherein the auxiliary tool (50) is bounded in the longitudinal direction of extension (L) by cover surfaces (56), wherein the auxiliary tool (50) is bounded outwardly in the radial direction (R) by a circumferential surface (54), and wherein the circumferential surface (54) has a clearance fit in the radial direction (R).

Claims

1. Modular forming tool (1), in particular press tool, comprising at least one primary tool (10), in particular a core, at least one reinforcement tube (30) and at least one auxiliary tool (50), wherein the forming tool (1) extends along a longitudinal extension direction (L), wherein the primary tool (10) has a workpiece machining surface (12), a sheath surface (14), and two end surfaces (16), wherein the workpiece machining surface (12) contacts or is adapted to contact a workpiece, wherein the sheath surface (14) bounds the primary tool (10) in a radial direction (R), wherein the end surfaces (16) delimit the primary tool (10) in the longitudinal extension direction (L), wherein the reinforcing tube (30) has an inner sheath surface (32) and an outer sheath surface (34), wherein the primary tool (10) is pressed into the reinforcing tube (30) indirectly and/or directly via the sheath surface (14), so that the primary tool (10) is secured relative to the reinforcing tube (30) in the radial direction (R), wherein the inner sheath surface (32) and the outer sheath surface (34) each have an interference fit, wherein the auxiliary tool (50) is limited in the longitudinal extension direction (L) by cover surfaces (56), wherein the auxiliary tool (50) is bounded outwardly in the radial direction (R) by a circumferential surface (54), wherein the circumferential surface (54) has a clearance fit in the radial direction (R), and wherein the modular forming tool (1) is a punch.

2. Modular forming tool (1) according to claim 1, wherein the forming tool (1) has an outer tool holder (60), wherein all of the primary tools (10), reinforcing tubes (30) and auxiliary tools (50) of the forming tool (1) extend at least partially within the tool holder (60).

3. Modular forming tool (1) according to claim 1, wherein at least one cover surface (56) of an auxiliary tool (50) directly contacts a reinforcing tube (30) and/or a primary tool (10).

4. Modular forming tool (1) according to claim 1, wherein at least one cover surface (56) of an auxiliary tool (50) is free of reinforcement tube contact and/or primary tool contact.

5. Modular forming tool (1) according to claim 1, wherein the outer dimension of the circumferential surface (54) of at least one auxiliary tool (50) substantially corresponds to the nominal dimension of the outer sheath surface (34) of a reinforcing tube (30).

6. Modular forming tool (1) according to claim 1, wherein the forming tool (1) comprises a plurality of reinforcing tubes (30), wherein the reinforcing tubes (30) surround the primary tool (10), in particular all primary tools (10), in the radial direction (R).

7. Modular forming tool (1) according to claim 1, wherein at least one end surface (16) of a primary tool (10), in particular of each primary tool (10), terminates flush in the longitudinal extension direction (L) with a reinforcing tube (30).

8. Modular forming tool (1) according to claim 1, wherein at least one end surface (16) of a primary tool (10), in particular of each primary tool (10), terminates flush in the longitudinal extension direction (L) with all reinforcing tube(s) (30) surrounding the respective primary tool (10).

9. Modular forming tool (1) according to claim 1, wherein the reinforcing tubes (30) and/or the auxiliary tools (50) are made of rolling bearing steel.

10. Modular forming tool (1) according to claim 1, wherein the reinforcing tubes (30) are formed such that all reinforcing tubes (30) having substantially the same outer dimension in radial direction (R) also have substantially the same inner dimension in radial direction (R).

11. Modular forming tool (1) according to claim 1, wherein at least the inner reinforcing tubes (30), preferably all reinforcing tubes (30), are formed such that the ratio of the inner dimension in radial direction (R) to the outer dimension in radial direction (R) is in a range of 0.7 to 0.98, preferably in a range of 0.8 to 0.97 and particularly preferably in a range of 0.85 to 0.95.

12. Modular forming tool (1) according to claim 1, wherein the modular forming tool (1) is limited in longitudinal extension direction (L) by a screw plug (70).

13. Modular forming tool (1) according to claim 1, wherein the screw plug (70) has a threaded section (72), wherein the threaded section (72) has a nominal diameter that is between an inner dimension and an outer dimension of a reinforcing tube (30) of the forming tool (1).

14. Modular forming tool set comprising two modular forming tools (1) according to claim 1, wherein the one modular forming tool is a punch (2), and wherein the second modular forming tool (1) is a die (3).

15. Method of manufacturing substantially rotationally symmetrical parts comprising the steps: Provision of a workpiece blank and Forming the workpiece blank by a modular forming tool (1) according to claim 1.

Description

[0024] Further advantages and features of the invention will be apparent from the following description in relation to the figures. Showing:

[0025] FIG. 1 a section through a modular forming tool in the form of a die;

[0026] FIG. 2 a section through a modular forming tool in the form of a punch and

[0027] FIG. 3 a modular forming tool set.

[0028] FIG. 1 shows a modular forming tool 1, which is a die 3. The forming tool 1 extends along the longitudinal direction L, wherein the radial direction R extends radially away from this longitudinal direction L. The forming tool 1 comprises a tool holder 60 as well as numerous primary tools 10 and reinforcing tubes 30. The forming tool 1 comprises a tool holder 60 as well as numerous primary tools 10 and reinforcing tubes 30. In addition, the forming tool 1 also has two auxiliary tools 50. One of the auxiliary tools 50 at least partially forms a distal end of the forming tool 1 along the longitudinal extension direction L by one of its cover surfaces 56. The tool holder 60 has an inner peripheral surface which forms an interference fit with the outer sheath surfaces 34 of the outer reinforcing tubes 30. In contrast, the auxiliary tools 50 and their circumferential surface 54 have clearance fits with respect to the tool holder 60 and the inner sheath surface of the tool holder 60, respectively. The reinforcing tubes 30 are each mechanically fixed in place via their inner sheath surface 32 and via the outer sheath surface 34 by means of an interference fit, so that this interference fit counteracts a displacement in the direction of longitudinal extension L. The reinforcement tubes 30 closest to the longitudinal direction of extension L in the radial direction R or the central reinforcement tubes 30 each at least partially enclose an auxiliary tool 50. These auxiliary tools 50 are pressed into the inner sheath surface 32 of the closest central reinforcement tube 30 via their sheath surface 14. Through this, a fixation of each primary tool 10 in radial direction R and at least partially also in longitudinal extension direction L can be achieved. The end surfaces 16 of the primary tools 10 each form the distal ends of the primary tools 10 in positive and/or negative longitudinal extension direction L. In an assembled state, as shown in FIG. 1, these end surfaces 16 can either be arranged in a contact-free manner or can be arranged in a contacting manner with an auxiliary tool 50 and/or a further end surface 16 of a primary tool 10, the contact-free end surfaces 16 forming in particular a distal end of the forming tool 1. Radially inward in radial direction R, the primary tools 10 each form a workpiece machining surface 12. The primary tool 10 can in particular be formed from a hard metal, while the reinforcing tubes 30 and/or the auxiliary tools 50 can be formed from rolling bearing steel. As can be seen from FIG. 1, the primary tools 10 and the reinforcing tubes 30 each form a press connection to one another via the contacting sheath surfaces 14 of the primary tools 10 and the inner sheath surfaces 32 of the reinforcing tubes. The auxiliary tools 50, on the other hand, do not have any interference fit, so that they are not held in any way by an interference fit in the longitudinal direction of extension L. Rather, there is a clearance fit between the circumferential surface 54 of the auxiliary tool 50 and the tool holder 60.

[0029] FIG. 2 shows a modular forming tool 1 in the form of a punch 2. The punch 2 has a primary tool 10 which is enclosed by the reinforcing tubes 30. The reinforcing tubes 30 each have an inner sheath surface 32 in the radial direction R towards the inside, which forms an interference fit with the adjacent or nearest surface. In addition to the reinforcing tubes 30 and the primary tool 10, the punch 2 also has a number of auxiliary tools 50, which serve to provide positive support for the primary tools 10 and the reinforcing tubes 30 in the direction of the longitudinal extension direction L. These auxiliary tools 50 each have a circumferential surface 54 which delimit the respective auxiliary tool 50 in radial direction R. These circulating surfaces 54 each have a clearance fit with their outer surrounding or contact partner in the radial direction R. In addition to the primary tools 10, the auxiliary tools 50 and the reinforcing tubes 30, the punch 2 also has a screw plug 70 which forms a distal end of the punch 2 along the longitudinal direction of extension L.

[0030] The screw plug 70 has a threaded section 72 that has a nominal diameter that is greater than the maximum dimension of all of the reinforcing tubes 30 of the punch 2.

[0031] FIG. 3 shows a forming tool set comprising a forming tool 1 in the form of a punch 2 and a forming tool 1 in the form of a die 3. The punch 2 and die 3 shown in FIG. 3 may correspond to the punch 2 in FIG. 2 and the die 3 in FIG. 1, respectively. During a forming process of a workpiece to be formed by means of the forming tool set, the punch 2 can be moved in relation to the die 3 along the longitudinal extension direction L in order to achieve forming of the workpiece. For this purpose, in particular, the free space F inside the punch 2 can be used to form the head of a bolt or screw. In other words, by displacing part of the material of the workpiece within the free space F and/or into the free space F, the head of the workpiece, in particular that of a screw and/or a bolt, can be created. The primary tools 10 are also used to achieve the configuration of the workpiece, such as a thread and/or a head and/or a shank of a substantially rotationally symmetrical component. In this respect, the auxiliary tools 50 are each arranged over their circumferential surface 54 in such a way that these have a clearance fit in the radial direction R.

LIST OF REFERENCE SIGNS

[0032] 1—Forming tool

[0033] 2—Punch

[0034] 3—Die

[0035] 10—Primary tool

[0036] 12—Workpiece machining surface

[0037] 14—Sheath surface

[0038] 16—Face

[0039] 30—Reinforcing tube

[0040] 32—Inner surface

[0041] 34—Outer sheath surface

[0042] 50—Auxiliary tool

[0043] 54—Circulation area

[0044] 56—Cover surface

[0045] 60—Tool holder

[0046] 70—Screw plug

[0047] 72—Threaded section of the screw plug

[0048] F—Free space

[0049] L—Longitudinal direction of extension

[0050] R—Radial direction