Device and method for deburring at least one bore opening of a metallic workpiece

Abstract

Device (10) for deburring at least one bore opening (2, 2', 2'') of a metallic workpiece (1), wherein the device (10) has a rotationally symmetrical countersink (11), wherein the countersink (11) is designed to remove at least one burr (4) of the at least one bore opening (2, 2', 2'') by being immersible and rotatable in an opening (3) that cuts the at least one bore opening (2, 2', 2'') and wherein the countersink (11) has a plurality of shearing edges (12) which are designed to remove the at least one burr (4) by shearing, characterized in that that the shear edges (12) are arranged in pairs on both circumferential sides of the bridge ridge (13), that the web ridges (13) are formed in three stages, wherein a first section (14) is formed parallel to a longitudinal axis (17) of the die (11), wherein a second section (15) has a first angle to the longitudinal axis (17) and wherein a third section (16) has a second angle to the longitudinal axis (17), the second angle being greater than the first angle and that the third section (16) is designed to center the countersink (11) in the opening (3) intersecting the at least one bore (2, 2', 2'') and the second section (15) is designed to remove the at least one burr (4).

Description

[0001] The present invention relates to a device for deburring at least one bore opening of a metallic workpiece according to the preamble of claim 1 and a method for deburring at least one bore opening of a metallic workpiece according to the preamble of claim 8.

[0002] It is known in the art to deburr metallic parts before further processing or at least before their use in, for example, a larger assembly. Since a burr is often relatively narrow with one or more sharp edges, removing it serves, on the one hand, to reduce the risk of injury to people who come into contact with the workpiece. On the other hand, since the burr can also detach from the workpiece during subsequent use in an assembly consisting of numerous different parts, removing the burr primarily serves to reduce the risk of damage and failure of the assembly. For example, a workpiece designed as a metallic gear can, after installation in a gearbox, damage the gearbox if a burr detaches from the gear and causes it to jam.

[0003] In this context, DE 38 38 516 A1 describes a method and a device for removing a burr from workpieces, in particular from the end face of tubular workpieces formed on a mandrel by rotary swaging. According to DE 28 38 516 A1, a burr formed during forming is bent by the forming tool into a shoulder of the mandrel and then sheared off by an axial movement of the mandrel.

[0004] From DE 60 2004 006 331 T1, a device for deburring forgings, in particular crankshafts, is known. The device has an upper cutting punch integrated into a vertically movable slide. A lower cutting punch passes through a lower cutting plate at the base of the upper cutting punch. The lower cutting punch interacts with the lower cutting plate to remove a burr from a crankshaft when the crankshaft contacts the cutting plate and to align the crankshaft held between the two cutting punches.

[0005] DE 10 2009 034 270 A1 discloses a countersink for removing a burr and / or a chip or for producing a chamfer on a material edge, which comprises a clamping shank and a tool head, wherein the tool head has a first and second machining stage with at least one cutting edge each, to which, following the cutting rotation direction, a clearance surface with a back taper and a chip groove are attached.

[0006] From DE 35 17 147 A1, a tool for deburring the edges of bores, in particular the curved edges of piston pin bores, is known. The tool has a tool shank and a plurality of elongated metallic elements held at the feed-direction front end of the tool shank, the surfaces of which are coated with abrasive particles in the working area. The elongated elements are arranged around the tool shank in an approximately frustoconical shape, and their rear ends, which follow the feed-direction from the abrasive-coated working areas, are resiliently movable.

[0007] However, the known devices for deburring metallic workpieces have a disadvantage in that they do not allow the simultaneous deburring of several burr points.

[0008] It is an object of the invention to propose an improved device for deburring at least one bore opening of a metallic workpiece.

[0009] This problem is solved according to the invention by the device for deburring at least one bore opening of a metallic workpiece according to claim 1.

[0010] Advantageous embodiments and further developments of the invention are evident from the dependent claims.

[0011] The invention relates to a device for deburring at least one bore opening of a metallic workpiece, wherein the device comprises a rotationally symmetrical countersink. The device is characterized in that the countersink is designed to remove at least one burr from the at least one bore opening by being able to be inserted into and rotated within an opening intersecting the at least one bore opening.

[0012] The invention describes a device designed to remove one or more burrs from one or more boreholes simultaneously using a countersink. The countersink is not inserted into the borehole containing the burr, but rather into an opening that intersects the borehole, i.e., an opening that touches and partially overlaps the borehole. For the actual deburring process, the countersink is then rotated, thereby removing any existing burrs.

[0013] This offers the advantage that the at least one burr can be removed easily and very quickly using the device according to the invention; in particular, a large number of burrs can be removed simultaneously using the device according to the invention.

[0014] The invention utilizes the observation that a burr typically only forms in that circumferential area of ​​the at least one bore opening that overlaps with the circular area of ​​the opening intersecting the at least one bore opening. However, this circumferential area—even with a multitude of bore openings—is always within the effective range of the countersink due to the design of the workpiece or the arrangement of the bore openings, so that a multitude of burrs can be removed in a single operation, namely lowering and rotating the countersink.

[0015] The opening that intersects the at least one borehole is preferably a so-called centering bore, which is designed to at least partially receive the countersink and to align it by an interaction of the geometric properties of the centering bore and the geometric properties of the countersink in such a way that a longitudinal axis of the countersink is coaxial to a longitudinal axis of the centering bore.

[0016] Preferably, the at least one bore opening or the centering bore has a parabolic inner surface. The parabolic inner surface can be produced, for example, by means of a suitably designed drill, in particular a parabolic drill.

[0017] Since the opening that intersects the at least one borehole is preferably a centering bore, i.e. a bore for better handling of the workpiece in a manufacturing process, it is advantageous not to have to provide a separate bore for the device according to the invention.

[0018] Equally preferred is the countersink which has a substantially conical tip, in particular with a flattened end piece.

[0019] For the purposes of the invention, an opening that intersects the at least one borehole is understood to be an opening whose outer diameter intersects an outer diameter of the borehole at two points, such that a part of the circular area of ​​the at least one borehole and a part of the circular area of ​​the opening are superimposed.

[0020] Preferably, the device is designed to automatically remove the at least one burr, i.e., the countersink is automatically plunged into the opening intersecting the bore and then rotated. This represents a significant simplification compared to the prior art method of burr removal by a human operator.

[0021] According to the invention, the countersink has a plurality of shearing edges designed to remove the at least one burr by shearing. The shearing edges preferably have an edge angle of 90° and are as sharp as possible. When the countersink enters the opening intersecting the at least one bore, its shearing edges preferably rest on the outer circumference of the opening intersecting the at least one bore, and thus also on that part of the outer circumference of the at least one bore which may have the burr or burrs. The shearing edges enable the at least one burr to be removed evenly and easily.

[0022] According to the invention, the shear edges are arranged in pairs on both circumferential sides of the ridges. The ridges form the radial and, if applicable, axial outer surfaces of blade-like ridges and are flattened radially and axially, respectively. The ridges are preferably produced by machining away the material of the countersink between the ridges. The ridges thus represent the material areas that were not removed. By arranging the shear edges circumferentially on both sides of each ridge, the countersink can be rotated about its longitudinal axis in both possible directions to remove the at least one burr.

[0023] Preferably, the countersink is designed to have twelve webs with a total of 24 shear edges.

[0024] According to the invention, the webs are designed in three stages, with a first section being parallel to a longitudinal axis of the countersink, a second section having a first angle to the longitudinal axis, and a third section having a second angle to the longitudinal axis, the second angle being larger than the first angle. This offers the advantage that the countersink can be optimally adapted to the opening intersecting the at least one borehole by means of a series of adjustable parameters, namely the first, second, and third sections or the first, second, and third angles, in order to enable the simplest, quickest, and cleanest possible removal of the at least one burr.

[0025] According to the invention, the third section is designed to center the countersink in the opening intersecting the at least one borehole, and the second section is designed to remove the at least one burr. This offers the advantage that the countersink can be adapted so precisely to the opening intersecting the at least one borehole that, due to the geometry of the third section, it is initially aligned coaxially to the longitudinal axis of the opening intersecting the at least one borehole. The alignment and centering are achieved by immersing the countersink into the opening intersecting the at least one borehole until the third section, i.e., the axially outermost section, comes to rest with its webs against an inner circumference of the opening.Furthermore, due to the second angle, the shear edges in the area of ​​the second section lie essentially exactly on the outer circumference of the at least one bore opening, advantageously in precisely the area which may have the at least one burr. Thus, the countersink can be easily and quickly plunged into the opening intersecting the at least one bore opening and rotated without complex centering or alignment to remove any burrs that may be present.

[0026] According to a further preferred embodiment of the invention, the countersink is designed to widen the outer circumference of the opening intersecting the at least one bore hole by machining during deburring. This means that the countersink, with its webs and the shear edges arranged laterally thereon, rests on the outer circumference, particularly in the area of ​​the second section. By rotating the countersink while applying a predefinable pressure to the opening intersecting the at least one bore hole, a predefinable amount of material can be machined away from its outer circumference, thus widening the outer circumference accordingly. This offers the advantage that any existing burr can be removed very reliably, since the countersink even removes additional material below the burr in this case.

[0027] According to a further preferred embodiment of the invention, the device comprises an automated immersion mechanism configured to immerse the countersink into the opening intersecting the at least one bore. This offers the advantage that the removal of the at least one burr can be largely or completely automated. In particular, no manual operation of the device is required to immerse the countersink into the opening intersecting the at least one bore.

[0028] Preferably, the device further comprises feeding means, for example in the form of a conveyor belt, by means of which a large number of workpieces can be automatically fed to the device. In this case, both the feeding of the workpieces and the deburring of the workpieces can be largely or completely automated.

[0029] The invention is explained below by way of example with reference to embodiments shown in the figures.

[0030] They show: Fig. 1. An exemplary and schematic representation of a metallic workpiece intended for deburring by a device according to the invention. Fig. 2. An exemplary and schematic close-up representation of a section of a metallic workpiece, Fig. 3. An exemplary and schematic representation of a possible design form of a die sinker of a device according to the invention and Fig. 4. An exemplary and schematic representation of a possible design form of a device according to the invention.

[0031] Identical objects, functional units, and comparable components are designated across all figures using the same reference symbols. These objects, functional units, and comparable components are identical in their technical characteristics unless explicitly or implicitly stated otherwise in the description.

[0032] Fig. Figure 1 shows, by way of example and schematically, a metallic workpiece 1 which is to be deburred by a device 10 according to the invention (not shown in Figure 10). Fig. 1) is provided. The workpiece 1 is, for example, a steel shaft 1 of a (also not shown) gearbox. The workpiece 1 has three bore openings 2, 2', 2'', which are, for example, provided for oil supply. As can be further seen, the workpiece 1 has an opening 3 that intersects the three bore openings 2, 2', 2''. The opening 3 has a parabolic cross-sectional area along the longitudinal axis of the workpiece 1, which was, for example, produced by means of a parabolic drill bit. Due to the parabolic cross-sectional area, the opening 3, in conjunction with a correspondingly designed countersink 11, can center and align the countersink as soon as it enters the opening 3 and comes into contact with the inner circumference of the opening 3. For example, the workpiece 1 has already been deburred by the device 10 according to the invention, so that in Fig. 1 no ridge 4 is shown.

[0033] Fig. Figure 2 shows an exemplary and schematic close-up view of a section of a metallic workpiece 1. The bore openings 2, 2', and 2'' are partially visible, as is the opening 3 intersecting the three bore openings 2, 2', and 2''. As can also be seen, there is a burr 4 on the outer circumference of bore opening 2'. The burr 4 is located precisely on that part of the outer circumference of bore opening 2' that lies within the area of ​​opening 3. Therefore, the burr 4 can be easily removed by using a countersink 11 of the device 10 (both not shown in Figure 2). Fig. 2) is immersed in the opening 3 and rotated. If burrs had also formed on the outer circumferences of the boreholes 2, 2'', these could be removed simultaneously and in the same operation as the burr 4 of the borehole 2'.

[0034] Fig. Figure 3 shows an exemplary and schematic embodiment of a possible embodiment of a countersink 11 of a device 10 according to the invention. The countersink 11 is designed to remove at least one burr 4 from the at least one bore opening 2, 2', 2'' by being immersible and rotatable in the opening 3 that intersects the at least one bore opening 2, 2', 2''. As can be seen, the countersink 11 has a plurality of shear edges 12, which are designed to remove the at least one burr 4 by shearing. The shear edges 12 are arranged in pairs on both circumferential sides of the web ridge 13. By way of example, the countersink 11 has Fig. 3 twelve bridge ridges with 24 shear edges 12 on. As in Fig. As further shown in Figure 3, the web ridges 13 are formed in three stages, wherein a first section 14 is formed parallel to a longitudinal axis 17 of the countersink 11, wherein a second section 15 has a first angle with respect to the longitudinal axis 17, and wherein a third section 16 has a second angle with respect to the longitudinal axis 17, the second angle being larger than the first angle. The third section 16 is designed to center the countersink 11 in the opening 3 intersecting the at least one bore 2, 2', 2'', and the second section 15 is designed to remove the at least one burr 4. For this purpose, the opening 3 has, for example, a parabolic cross-sectional area to which the geometry of the countersink 11, i.e., the first section 14, the second section 15, and the third section 16, or the first, second, and third angles, are adapted.When the countersink 11 is immersed in the opening 3, it is driven in until the ridges 13 in section 16 come into contact with the circumference inside the opening 3. This automatically centers the countersink 11 and aligns it coaxially with a longitudinal axis of the opening 3. In this position, section 15 of the countersink 11 rests on an outer circumference of the opening 3. When the countersink 11 is now rotated, its shear edges 12 in section 15 shear off any burrs 4 present on those areas of the outer circumference of the bore openings 2, 2', 2'' that overlap the circumference of the opening 3.

[0035] Fig.Figure 3 shows an exemplary and schematic embodiment of a possible embodiment of a device 10 according to the invention. The device 10 comprises, for example, an automated immersion mechanism 18 configured to immerse the countersink 11 into the opening 3 of the workpieces 1, which intersects the at least one bore opening 2, 2', 2''. The device 10 further comprises a conveyor belt 19 by means of which a plurality of workpieces 1 can be automatically fed to the device 10. For example, both the feeding of the workpieces 1 and the deburring of the workpieces 1 are fully automated. Reference sign 1 workpiece, a steel shaft of a gearbox 2, 2', 2'' borehole 3 the opening that cuts through at least one borehole 4 degrees 10 Device 11 Countersinks 12 Shearing edge 13 bridge spines 14 first section 15 second section 16 third section 17 Longitudinal axis of the countersink 18 automated immersion mechanism 19 Conveyor belt

Claims

[1] Device (10) for deburring at least one bore opening (2, 2', 2'') of a metallic workpiece (1), wherein the device (10) has a rotationally symmetrical countersink (11), wherein the countersink (11) is designed to remove at least one burr (4) of the at least one bore opening (2, 2', 2'') by being immersible and rotatable in an opening (3) that intersects the at least one bore opening (2, 2', 2'') and wherein the countersink (11) has a plurality of shear edges (12) which are designed to remove the at least one burr (4) by shearing, characterized by , that the shear edges (12) are arranged in pairs on both circumferential sides of the bridge ridge (13), that the web ridges (13) are formed in three stages, wherein a first section (14) is formed parallel to a longitudinal axis (17) of the die (11), wherein a second section (15) has a first angle to the longitudinal axis (17) and wherein a third section (16) has a second angle to the longitudinal axis (17), the second angle being greater than the first angle and that the third section (16) is designed to center the countersink (11) in the opening (3) intersecting the at least one bore (2, 2', 2'') and the second section (15) is designed to remove the at least one burr (4). [2] Device (10) according to claim 1, characterized by , that the countersink (11) is designed to widen the outer circumference of the opening (3) which cuts through at least one bore opening (2, 2', 2'') by machining during deburring. [3] Device (10) according to at least one of claims 1 and 2, characterized by , that the device (10) comprises an automated immersion mechanism (18) designed to immerse the countersink (11) into the opening (3) cutting the at least one bore opening (2, 2', 2''). [4] Method for deburring at least one bore opening of a metallic workpiece, wherein the at least one bore opening (2, 2', 2'') is deburred by means of a rotationally symmetrical countersink (11), characterized by , that the at least one bore opening (2, 2', 2'') is deburred by immersing the countersink (11) in an opening (3) that cuts the at least one bore opening (2, 2', 2'') and rotating it. [5] Method according to claim 4, characterized by , that a large number of boreholes (2, 2', 2'') are deburred simultaneously. [6] Method according to at least one of claims 4 and 5, characterized by, that the countersink (11) is centered in the opening (3) which cuts at least one bore opening (2, 2', 2'') before deburring.

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