Device and method for deburring at least one borehole in a metal workpiece

Abstract

The invention relates to a device (10) for deburring at least one bore hole (2, 2', 2") of a metal workpiece (1), wherein the device (10) has a rotationally symmetrical profile tool (11). The device (10) according to the invention is characterized in that the profile tool (11) is designed to remove at least one burr (4) of the at least one bore hole (2, 2', 2"), wherein the profile tool can be introduced into an opening (3) intersecting the at least one bore hole (2, 2', 2") and rotated. The invention also relates to a corresponding method.

Description

[0001] The invention relates to an apparatus for deburring at least one borehole in a metal workpiece and to a method for deburring at least one borehole in a metal workpiece.

[0002] In the prior art, it is known to deburr metals before they are further processed or at least before they are used in, for example, a larger component. Since burrs are usually narrow and have one or more sharp edges, deburring serves to reduce the risk of injury to persons who come into contact with the workpiece. However, since the burrs may also become detached from the workpiece by the handling of the component when the workpiece is subsequently used in an assembly consisting of a plurality of different workpieces, deburring also serves primarily to reduce the risk of the component being damaged and falling apart. For example, a workpiece in the form of a metal gear wheel may cause damage to the transmission after it has been installed in the transmission if a burr of the gear wheel becomes detached from the gear wheel and jams the transmission.

[0003] In this context, DE 28 38 516 A1 describes a method and a device for removing burrs from workpieces, in particular from the ends of tubular workpieces formed by rotary forging on a mandrel. According to DE 28 38 516 A1, the burrs that occur during the forming process are bent down into the shoulder of the mandrel by the forming tool and then sheared off by the axial movement of the mandrel.

[0004] DE 60 2004 006 331 T1 discloses a device for deburring forged parts, in particular crankshafts. The device has an upper cutting punch integrated in a vertically movable slide. The lower cutting punch passes through a lower cutting plate on the base of the upper cutting punch. The lower cutting punch cooperates with the lower cutting plate to remove burrs from the crankshaft when the crankshaft comes into contact with the cutting plate and to orient the crankshaft retained between the two cutting punches.

[0005] However, known devices for deburring metal workpieces have the disadvantage that they do not allow for simultaneous deburring of multiple locations having burrs.

[0006] The object of the present invention is to propose an improved device for deburring at least one bore hole in a metal workpiece.

[0007] This object is achieved according to the invention by a device for deburring at least one borehole in a metal workpiece as described below. Advantageous configurations and developments of the invention will become apparent from the following description.

[0008] The present invention relates to a device for deburring at least one borehole in a metal workpiece, wherein the device has a rotationally symmetrical profile tool. The device is notable in that the profile tool is configured to remove at least one burr from the at least one borehole, wherein the profile tool can be inserted into an opening intersecting the at least one borehole and rotated.

[0009] Thus, the invention describes a device configured to remove one or more burrs from one or more drilled holes simultaneously by means of a profile cutter. However, the profile cutter is not inserted into the drilled hole with the burr, but into an opening intersecting the drilled hole, i.e. an opening in contact with the drilled hole and partially overlapping with the drilled hole. For the actual deburring operation, the profile cutter is then rotated, with the result that the existing burrs are removed.

[0010] This results in the advantage that the at least one burr can be easily removed by the device according to the invention in a very time-saving manner, in particular a plurality of burrs can be removed simultaneously by the device according to the invention.

[0011] The invention makes use of the observation that burrs usually protrude only in a circumferential region of the at least one borehole which overlaps with the circular region of the opening intersecting the at least one borehole. However, due to the configuration of the workpiece or the arrangement of the boreholes, this circumferential region is always within the radius of action of the profile tool even in the case of multiple boreholes, so that multiple burrs can be removed in a single operation (i.e. lowering of the profile tool and rotation of the profile tool).

[0012] The opening intersecting at least one borehole is preferably a so-called centering hole, which is configured to at least partially receive a forming tool and, through the cooperation of the geometric structure of the centering hole with the geometric structure of the forming tool, orient the forming tool so that the longitudinal axis of the forming tool is coaxial with the longitudinal axis of the centering hole.

[0013] Particularly preferably, at least one drill hole or centering hole has a parabolic inner surface. The parabolic inner surface can be produced in particular by a suitably configured drill head, in particular by a parabolic drill head.

[0014] Since the opening intersecting the at least one bore hole is preferably a centering hole, ie a hole for better handling of the workpiece during the manufacturing process, it is advantageously not necessary to provide the device according to the invention with a separate hole.

[0015] It is also particularly preferred if the profile tool has a substantially conical end, in particular a flat end piece.

[0016] In the context of the present invention, an opening intersecting at least one borehole is understood to be an opening whose outer diameter intersects the outer diameter of the borehole at two points, so that a part of the circular area of ​​the at least one borehole and a part of the circular area of ​​the opening overlap.

[0017] Preferably, the apparatus removes at least one burr in an automated manner, ie the profile cutter is inserted into the opening intersecting the borehole in an automated manner and then rotated. This represents a significant simplification compared to conventional prior art burr removal by a human operator.

[0018] According to a preferred embodiment of the invention, the profile cutter has a plurality of shearing edges, which are configured to remove the at least one burr by shearing off the at least one burr. In this case, the shearing edges preferably have an edge angle of 90° and are configured as sharp edges as possible. If the profile cutter is now inserted into an opening intersecting the at least one borehole, its shearing edges are preferably located on the periphery of the opening intersecting the at least one borehole, and therefore also on that part of the periphery of the at least one borehole that may have one or more burrs. The shearing edges allow uniform and easy removal of the at least one burr.

[0019] According to a particularly preferred embodiment of the invention, the shearing edges are arranged in pairs on both circumferential sides of the land ridge. The land ridge forms the radially outer side and optionally the axially outer side of the blade-shaped land and flattens radially and axially outwards. The land is then preferably produced by cutting away the material of the profiling tool between the lands. The land thus represents an unremoved material area. Since the shearing edges are arranged on both sides of each land ridge in the circumferential direction, the profiling tool can be rotated about its longitudinal axis in two possible rotational directions to remove at least one burr.

[0020] Preferably, the profile cutter has twelve land ridges for a total of twenty-four shearing edges.

[0021] According to another particularly preferred embodiment of the present invention, the land ridge is formed with three segments, wherein the first portion is formed parallel to the longitudinal axis of the profile tool, wherein the second portion is at a first angle relative to the longitudinal axis, and wherein the third portion is at a second angle relative to the longitudinal axis, wherein the second angle is greater than the first angle. This results in the advantage that the profile tool can be optimally adapted to the opening intersecting the at least one drill hole to a large extent via several adjustable parameters (i.e. the first portion, the second portion and the third portion and the first angle, the second angle and the third angle) in order to remove at least one burr as easily, quickly and cleanly as possible.

[0022] According to another particularly preferred embodiment of the present invention, the third part is configured to center the profile tool in the opening intersecting the at least one borehole, and the second part is configured to remove the at least one burr. This has the advantage that, due to the geometry of the third part, the profile tool can be so accurately adapted to the opening intersecting the at least one borehole that the profile tool is initially oriented coaxially with the longitudinal axis of the opening intersecting the at least one borehole. Orientation and centering take place here because the profile tool is inserted into the opening intersecting the at least one borehole until the third part, i.e. the axially outermost part, bears on the inner periphery of the opening by its land ridge. In addition, due to the second angle, the shearing edge in the region of the second part is more or less exactly located on the outer periphery of the at least one borehole, advantageously exactly in the region optionally having at least one burr. Thus, the profile tool can be easily and quickly inserted into the opening intersecting the at least one borehole and rotated without complicated centering or orientation to remove any burrs that may be present.

[0023] According to another preferred embodiment of the invention, the profile tool is configured to widen the periphery by cutting the periphery of the opening intersecting the at least one borehole during deburring. This means that the profile tool is supported on the periphery by its land ridge and the shearing edges arranged laterally thereon, in particular in the region of the second portion. As a result of the rotation of the profile tool when the profile tool is pushed against the opening intersecting the at least one borehole by a predetermined pressure, a predetermined amount of material can now also be cut off from its periphery, thereby widening the periphery accordingly. This results in the advantage that at least one burr that may be present can be removed very reliably, since in this case the profile tool even removes additional material below the at least one burr.

[0024] According to another preferred embodiment of the invention, the apparatus comprises an automatic insertion mechanism, which is configured to insert the profile tool into the opening intersecting the at least one borehole. This results in the advantage that the removal of at least one burr can be performed largely or completely in an automatic manner. In particular, in order to insert the profile tool into the opening intersecting the at least one borehole, it is not necessary to manually actuate the apparatus.

[0025] Preferably, the device also comprises a feeding device, preferably in the form of a conveyor belt, by which a plurality of workpieces can be fed to the device in an automatic manner. In this case, the feeding of the workpiece and the deburring of the workpiece can all be carried out in a mostly or completely automatic manner.

[0026] The invention also relates to a method for deburring at least one borehole in a metal workpiece, wherein the at least one borehole is deburred by a rotationally symmetrical profile tool. The method according to the invention is notable in that the at least one borehole is deburred by the profile tool being inserted into an opening intersecting the at least one borehole and rotating. The method according to the invention thus describes the use according to the invention of the device according to the invention. This results in that the method according to the invention also achieves the advantages already mentioned in conjunction with the device according to the invention.

[0027] According to a preferred embodiment of the invention, a plurality of boreholes are deburred simultaneously. Thus, the deburring of the workpiece can be carried out relatively quickly in a time-saving manner, since not every borehole has to be deburred individually. This in turn increases the production volume, in particular during industrial manufacturing, and reduces the unit cost of the workpiece.

[0028] According to another preferred embodiment of the present invention, before deburring, the profile tool is centered in the opening intersecting the at least one borehole. When the profile tool is inserted into the opening, the centering advantageously occurs only based on the geometry of the profile tool and the geometry of the opening intersecting the at least one borehole.

[0029] The invention is explained hereinafter by way of example based on the embodiments shown in the drawings.

[0030] In the attached picture:

[0031] Figure 1 By way of example and schematically shown is a metal workpiece intended to be deburred by the device according to the invention,

[0032] Figure 2 By way of example and schematically showing details of a sub-region of a metal workpiece,

[0033] Figure 3 By way of example and schematically a possible embodiment of a profile tool of the device according to the invention is shown, and

[0034] Figure 4 By way of example and schematically, possible embodiments of the device according to the invention are shown.

[0035] The same items, functional units and similar components are provided with the same reference numerals throughout the drawings. These items, functional units and similar components are implemented identically in terms of their technical features, unless otherwise explicitly or implicitly apparent from the description.

[0036] Figure 1 By way of example and schematically, a metal workpiece 1 is shown which is intended to be processed by a device 10 ( Figure 1Deburring of a workpiece 1 by means of a device 10 according to the invention (not shown). According to the example, the workpiece 1 is a shaft 1 made of steel of a transmission (also not shown). The workpiece 1 has three bores 2, 2', 2", which, according to the example, are intended for guiding oil. It is also obvious that the workpiece 1 has an opening 3 intersecting the three bores 2, 2', 2". The opening 3 has a parabolic cross-sectional area along the longitudinal axis of the workpiece 1, which, according to the example, is produced by a parabolic drill. As a result of the parabolic cross-sectional area, the opening 3 cooperating with the forming tool can center and orient the forming tool, once a forming tool 11 of a corresponding shape is inserted into the opening 3 and comes into contact with the inner periphery of the opening 3. According to the example, the workpiece 1 has been deburred by the device 10 according to the invention, so that Figure 1 Glitch 4 is not shown.

[0037] Figure 2 By way of example and schematically, a detail of a sub-region of a metal workpiece 1 is shown. The boreholes 2, 2' and 2" and the opening 3 intersecting the three boreholes 2, 2', 2" are visible to some extent. It can also be seen that a burr 4 is present on the periphery of the borehole 2'. The burr 4 is located precisely in the area of ​​the periphery of the borehole 2' which is located in the area of ​​the opening 3. Therefore, because the profile tool 11 ( Figure 2 The burrs 4 can be easily removed by inserting a burr (not shown) into the opening 3 and rotating it. If burrs also occur on the periphery of the boreholes 2, 2", these burrs can be removed simultaneously in the same operation as the burrs 4 on the borehole 2'.

[0038] Figure 3 By way of example and schematically, a possible embodiment of a forming tool 11 of the device 10 according to the invention is shown. The forming tool 11 is configured to remove at least one burr 4 from the at least one bore hole 2, 2', 2", because the forming tool can be inserted into the opening 3 intersecting the at least one bore hole 2, 2', 2" and rotated. It can be seen that the forming tool 11 has a plurality of shearing edges 12, which are configured to remove the at least one burr 4 by shearing it off. In this case, the shearing edges 12 are each arranged in pairs on two circumferential sides of the land ridge 13. By way of example, Figure 3 The forming tool 11 in the embodiment has twelve land ridges and twenty-four shearing edges 12. Figure 3As shown, the blade ridge 13 is formed to have three segments, wherein the first portion 14 is formed parallel to the longitudinal axis 17 of the forming tool 11, wherein the second portion 15 is formed at a first angle relative to the longitudinal axis 17, and wherein the third portion 16 is formed at a second angle relative to the longitudinal axis 17, wherein the second angle is greater than the first angle. The third portion 16 is configured to center the profiling tool 11 in the opening 3 intersecting the at least one bore hole 2, 2', 2", and the second portion 15 is configured to remove the at least one burr 4. To this end, according to the example, the opening 3 has a parabolic cross-sectional area, to which the geometry of the profiling tool 11 (i.e. the first portion 14, the second portion 15 and the third portion 16, or the first angle, the second angle and the third angle) is adapted. When the profiling tool 11 is inserted into the opening 3, the profiling tool 11 is inserted far enough so that the land ridge 13 comes into contact with the circumference of the interior of the opening 3 in the portion 16. As a result, the profiling tool 11 is automatically centered and coaxially oriented with the longitudinal axis of the opening 3. In this position, the portion 15 of the profiling tool 11 is located on the periphery of the opening 3. If the profiling tool 11 is now rotated, it shears off any burrs 4 that may be present in the portion 15 in the area of ​​the periphery of the bore hole 2, 2', 2" that overlaps with the periphery of the opening 3 by means of the shearing edge 12.

[0039] Figure 3 By way of example and schematically, a possible embodiment of an apparatus 10 according to the invention is shown. According to the example, the apparatus 10 comprises an automatic insertion mechanism 18, which is configured to insert a profile tool 11 into an opening 3 in a workpiece 1 intersecting at least one bore 2, 2', 2". The apparatus 10 also comprises a conveyor belt 19, by means of which a plurality of workpieces 1 can be fed to the apparatus 10 in an automatic manner. According to the example, both the feeding of the workpieces 1 and the deburring of the workpieces 1 are performed in a fully automatic manner.

[0040] List of Reference Numerals

[0041] 1 Workpiece, transmission shaft made of steel

[0042] 2, 2', 2" Drilling

[0043] 3 Openings that intersect at least one borehole

[0044] 4 Burrs

[0045] 10. Equipment

[0046] 11 Forming tool

[0047] 12 Shear blade

[0048] 13 Land ridge

[0049] 14 Part 1

[0050] 15 Part 2

[0051] 16 Part 3

[0052] 17 Longitudinal axis of the profile tool

[0053] 18 Automatic insertion mechanism

[0054] 19 Conveyor Belt

Claims

1. A device (10) for deburring a plurality of boreholes (2, 2', 2") in a metal workpiece (1), wherein: The device (10) has a rotationally symmetrical forming tool (11). It is characterized in that the rotationally symmetrical forming tool (11) has a plurality of shearing edges (12) and a plurality of blade ridges (13), wherein each of the plurality of shearing edges (12) is arranged in pairs on two circumferential sides of the corresponding blade ridge (13), wherein the forming tool (11) is configured to remove at least one burr (4) from the plurality of bore holes (2, 2', 2"), wherein the forming tool can be inserted into an opening (3) intersecting the plurality of bore holes (2, 2', 2") and rotated.

2. The device (10) according to claim 1, characterized in that Each of the plurality of land ridges (13) comprises a first portion (14), a second portion (15) and a third portion (16), wherein the first portion (14) is formed parallel to a longitudinal axis (17) of the forming tool (11), wherein the second portion (15) presents a first angle relative to the longitudinal axis (17), and wherein the third portion (16) presents a second angle relative to the longitudinal axis (17), wherein the second angle is greater than the first angle.

3. The device (10) according to claim 2, characterized in that The third portion (16) is configured to center the profile cutter (11) in the opening (3) intersecting the plurality of boreholes (2, 2', 2"), and the second portion (15) is configured to remove the at least one burr (4).

4. The device (10) according to any one of claims 1 to 3, characterized in that The profile cutter (11) is configured to widen the periphery of the opening (3) intersecting the plurality of boreholes (2, 2', 2") by cutting the periphery during deburring.

5. The device (10) according to any one of claims 1 to 3, characterized in that The apparatus (10) comprises an automatic insertion mechanism (18) configured to insert the profile cutter (11) into the opening (3) intersecting the plurality of boreholes (2, 2', 2") .

6. A method for deburring a plurality of drilled holes in a metal workpiece, wherein: The multiple drill holes (2, 2', 2") are deburred by a rotationally symmetrical forming tool (11), characterized in that the rotationally symmetrical forming tool (11) has a plurality of shearing edges (12) and a plurality of land ridges (13), wherein each of the plurality of shearing edges (12) is arranged in pairs on two circumferential sides of the corresponding land ridge (13), wherein the multiple drill holes (2, 2', 2") are deburred simultaneously by inserting the forming tool (11) into an opening (3) intersecting the multiple drill holes (2, 2', 2") and rotating.

7. The method according to claim 6, characterized in that Prior to deburring, the profile cutter (11) is centered in the opening (3) intersecting the plurality of boreholes (2, 2', 2") .

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