EP1718430A2 - Procede d'usinage par enlevement de copeaux de trous de precision - Google Patents

Procede d'usinage par enlevement de copeaux de trous de precision

Info

Publication number
EP1718430A2
EP1718430A2 EP05707231A EP05707231A EP1718430A2 EP 1718430 A2 EP1718430 A2 EP 1718430A2 EP 05707231 A EP05707231 A EP 05707231A EP 05707231 A EP05707231 A EP 05707231A EP 1718430 A2 EP1718430 A2 EP 1718430A2
Authority
EP
European Patent Office
Prior art keywords
tool
tool according
machining
bore
honing stone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05707231A
Other languages
German (de)
English (en)
Inventor
Friedrich Häberle
Dieter Kress
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG
Original Assignee
Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG filed Critical Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG
Publication of EP1718430A2 publication Critical patent/EP1718430A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D77/00—Reaming tools
    • B23D77/02—Reamers with inserted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/08—Honing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23B2222/16—Cermet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/31—Diamond
    • B23B2226/315—Diamond polycrystalline [PCD]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2229/00—Details of boring bars or boring heads
    • B23B2229/04—Guiding pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2250/00—Compensating adverse effects during turning, boring or drilling
    • B23B2250/12—Cooling and lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D2277/00—Reaming tools
    • B23D2277/02—Cutting head and shank made from two different components which are releasably or non-releasably attached to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D2277/00—Reaming tools
    • B23D2277/62—Margins, i.e. the area on the circumference of the tool immediately behind the axial cutting edge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/34—Combined cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/34—Combined cutting means
    • Y10T408/348—Plural other type cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/34—Combined cutting means
    • Y10T408/356—Combined cutting means including plunging [single stroke] cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/905—Having stepped cutting edges
    • Y10T408/906—Axially spaced

Definitions

  • the invention relates to a tool for machining precision bores in workpieces according to the preamble of claim 1.
  • Tools of the type mentioned here are known (DE 198 30 903 A1). They have a first processing stage with at least one geometrically defined cutting edge and a second processing stage with at least one honing stone, which includes geometrically undefined cutting edges. It has been found that the use of such tools is complex: special guide devices are required with the aid of which the tool is supported in the workpiece to be machined. Incidentally, the processing results are not always satisfactory.
  • the object of the invention is therefore to create a tool which does not have these disadvantages.
  • a tool which has the features mentioned in claim 1. It is characterized in that the first machining stage has at least three support regions which are arranged at a distance from one another in the circumferential direction and which are designed and arranged such that they are supported on the wall of a precision bore when machining. Because the tool is directly on the bore wall and not on any guide devices is present, no additional devices are required when machining a workpiece, which hold the tool in a specific position relative to it. This considerably simplifies the use of the tool.
  • Figure 1 is an exploded view of a tool with three processing stages
  • FIG. 2 shows a side view of the third processing stage according to FIG. 1;
  • FIG. 3 shows an end view of the third processing stage according to FIG. 2;
  • FIG. 5 shows a cross section of a honing stone according to FIG. 4,
  • Figure 7 is a perspective view of a knife plate obliquely from the front
  • the tool 1 shown in an exploded view in FIG. 1 has three processing stages, namely a first processing stage 3 used for pre-processing with at least one knife plate 5, which has at least one geometrically determined cutting edge 7.
  • a second processing stage 9 is provided, which is used for further processing and has at least one cutter plate 11 with at least one geometrically determined cutting edge 13.
  • the tool 1 has a third machining stage 15, which has at least one geometrically undetermined cutting edge 17.
  • a preferably hollow shaft 19 is provided, which serves to fasten the tool 1 in a machine tool and, as usual, has a conical circumferential surface which tapers to the left, as shown in FIG.
  • a preferably conical recess is made in the end face 21 of the third machining stage 15 opposite the shaft 19, which recess serves to receive a shaft 23 starting from the second machining stage 9, the diameter of which is smaller than the outer diameter of the second machining stage 9 , so that it is surrounded by an annular flat surface 25.
  • a conical recess (not visible here) is made in the end face 27 of the second processing stage 9 opposite the shaft 23, into which a shaft 29 starting from the first processing stage 3 engages.
  • the tool 1 has a modular structure and that the machining stages 3, 9 and 15 are coupled to one another by a precision connection, also referred to as a short taper connection.
  • a precision connection also referred to as a short taper connection.
  • the end face 21 of the third machining stage interacts with the annular flat surface 25 of the second machining stage.
  • the modular structure also allows processing stages to be exchanged when worn and to implement different tools 1.
  • a screw 33 which serves to clamp the first processing stage 3 with the second, processing stage 9 at the third processing stage 15.
  • the tool 1 for machining precision bores has three processing stages assigned to different processing types, of which the first and second processing stages 3 and 9 are used for preliminary and intermediate machining and the third processing stage 15 is for finishing machining.
  • the machining stages are arranged accordingly: starting from the shaft 19, which can be connected to a machine tool, the third machining stage 15 for finished machining is first available. This is followed by the second processing stage 9, viewed in the direction of the screw 33, that is to say in the direction of advance.
  • the front of the tool 1 forms the first machining stage 3, which is first inserted into a precision bore to be machined and removes chips from its surface there.
  • the at least one cutting edge 7 of the first processing stage 3 acts first. Then the at least one geometrically determined cutting edge 13 of the second processing stage 9 comes into engagement with the surface of the bore and carries out the further or intermediate machining of the bore surface. Only then does the at least one geometrically undetermined cutting edge 17 of the third machining stage 15 come into engagement with the bore surface.
  • the first processing stage 3 has several; preferably has knife plates distributed uniformly around the circumference of the processing stage, of which knife plates 5 and 5 'are shown here.
  • the knife plates 5, 5 'etc. of the first processing stage 3 are arranged tangentially and virtually sunk into the end face 35 of the first processing stage 3.
  • the second processing stage 9 here has a plurality of cutter plates which are inserted into the peripheral surface 37 of the second processing stage. For example, six to eight such cutting inserts can be provided, the number of which also depends on the size of the processing stage 9, that is to say on its diameter.
  • the knife plates 11, 11 'and 11 "can be seen in FIG. 1. They are inserted in grooves which run radially to the central axis 39 of the tool 1 and thus also to the central axis of the second machining stage 9.
  • the knife plates in the first and second machining stages 3 and 9 are fastened in a known manner, preferably screwed or fixed by means of claws, and it is also conceivable to solder them firmly.
  • FIG. 1 also shows that the geometrically undetermined cutting edge 17 is designed here as a honing stone 41 which has hard material particles, at least in its outer surface 45 with hard material particles projecting beyond the peripheral surface 43 of the third processing stage 15 is provided.
  • FIG. 1 also shows that 43 guide strips are introduced into the peripheral surface, of which here the guide strips 47, 49 and 51 can be seen.
  • the honing stone 41 preferably has a coolant / lubricant groove 53 in its outer surface 45, which runs like the honing stone 41 and the guide strips parallel to the central axis 39. At least one opens into this groove 53 , here three holes 55, 57 and 59, which serve as an outlet for a coolant / lubricant.
  • the honing stone 41 is clamped and held securely by at least one, here two clamping claws 61, 63, which are arranged laterally on a long side of the honing stone 41.
  • the tool shown in FIG. 1 is thus characterized by the combination of two machining stages with geometrically determined cutting edges with a machining stage which has a geometrically undetermined cutting edge.
  • FIG. 2 shows a part of the tool 1, namely the third processing stage 15.
  • the processing stage 15 is rotated about the central axis 39 in the illustration according to FIG. 2 in such a way that the honing stone 41 is arranged at the top.
  • the representation according to FIG. 2 is enlarged compared to that in FIG. 1.
  • the same parts are provided with the same reference numerals, so that reference is made to the preceding description.
  • FIG. 2 serves in particular to explain the interchangeable honing stone 41 further. This is inserted into a groove 65 which is introduced into the base body 67 of the third processing stage 15. It is held by the two clamps 61 and 63, whose clamping lips rest on a side surface 69 of the honing stone 41 and tighten it in the base body 47. This will be discussed in more detail below.
  • the three bores 55, 57 and 59 are made in the honing stone 41 and completely penetrate their base body starting from their outer surface 45.
  • the bores 55, 57 and 59 are designed here as a stepped bore and have a radially outer first region of smaller inner diameter and a radially inner region with a larger inner diameter.
  • the holes 55, 57 and 59 serve to accommodate an adjusting device 71, which is preferably the same in all holes. Therefore, only the adjustment device 71, which is arranged in the bore 55, is dealt with. It has a first actuating means 73, which is arranged in the first region of the bore 55, which adjoins the outer surface 45 of the honing stone 41.
  • the first adjusting means 73 is preferably designed as an adjusting screw, the second adjusting means 75 as a pressure piece. This is preferably made of hard metal, so that a pressure force exerted by the adjusting screw does not damage the surface of the pressure piece.
  • the adjusting device 71 can be modified insofar as the second adjusting means 75 can also be arranged in a suitable bore 79 in the base body 67 of the third machining stage 15. This is indicated by dashed lines in connection with the bore 57 in FIG. 2.
  • the second adjusting means 75 in the honing stone 41 can be omitted.
  • the first adjusting means 73 namely the adjusting screw, must be adapted accordingly.
  • the. Bore 55, 57, 59 have a uniform diameter over their length.
  • FIG. 2 also shows the conical recess 81 introduced into the end face 21 of the third machining stage 15, which was explained with reference to FIG. 1 and serves to receive the conical shaft 23 of the second machining stage 19.
  • FIG. 3 shows an end view of the third processing stage 15 according to FIG. 2.
  • the same parts are provided with the same reference numbers, so that reference is made to the description of the previous figures in order to avoid repetition.
  • the representations 3 is simplified and serves to illustrate the fixing of the honing stone 41 in the base body 67 of the third processing stage 15.
  • the honing stone 41 is introduced into a groove 65 made in the base body 67, which runs essentially parallel to the central axis 39 of the tool 1 and thus the third machining stage 15 and is essentially rectangular in cross section as shown in FIG. 3. It has a base area 83, which preferably has a coolant / lubricant outlet in each of the areas of the bores 55, 57 and 59, so that a medium escaping here can exit through the coolant / lubricant channel 77, which passes through the adjusting means 73 and 75 , The coolant / lubricant thus passes into the coolant / lubricant groove 53 of the honing stone 41, which was explained with reference to FIG. 1.
  • the groove 65 is delimited by two side flanks 85, 87 which are substantially perpendicular to the base 83, the side flank 85 on the right in FIG. 3 serving as an abutment for the honing stone 41 and the side flank 87 on the left in FIG. 3 being broken so that the clamping claws open the side surface 69 of the honing stone 41 act and these can press against the side surface 85 and the base surface 83.
  • the clamping claw 61 is shown as an example, which holds the honing stone 41 with a clamping lip 89. This is provided on the side surface 69 facing the clamping claw 61 with a clamping groove 91 which has a clamping surface 93.
  • the clamping claw 61 has a through hole 95, which is penetrated by a clamping screw 97. This is exemplarily provided with two counter-rotating thread areas, one of which one cooperates with the clamping claw 61 and the other with the base body 67 of the third processing stage 15;
  • FIG. 3 again shows the bore 55, which penetrates the honing stone 41 vertically, that is to say in the direction of a diameter line D, and on the one hand opens into the outer surface 45 of the honing stone 41 and on the other hand opens to the base surface 83 of the groove 65.
  • the radially outer area of smaller diameter of the bore 55 is provided with an internal thread which interacts with the first actuating means, which according to the explanations above is designed as an adjusting screw, for example.
  • the tool 1 or the third processing stage 15 has a plurality of guide strips inserted into the peripheral surface 43, some of which could be seen in FIG. 1.
  • a guide bar 47 is provided opposite the honing bar 41, - as shown in FIG. 3 - a guide bar 49 to the left and a guide bar 47 'to the right of it.
  • the third processing stage 15 is guided and supported very precisely in the precision bore to be machined by the guide strips, so that displacement forces are safely absorbed. This leads to an exact bore geometry.
  • the guide strips are preferably made of hard metal, cermet or PCD. It is also possible to produce or to coat only the surface of the guide strips projecting over the circumferential surface of the tool 1 in whole or in part from abrasion-resistant material. It can be seen from FIG. 3 that the guide bar 49, as seen in the direction of rotation indicated by an arrow P, lags the guide bar 47 by approximately 60 °, whereas, in contrast, the guide bar 47 'leads the guide bar 47 by approximately 60 °. The guide bar 49 'lags the honing bar 41, measured from the diameter line D, by approximately 60 °.
  • FIG. 4 shows a longitudinal section of the honing stone 41.
  • the same parts are provided with the same reference numbers, so that reference is made to the preceding description in this respect.
  • a first section 5 . 5a has a smaller diameter and is provided with an internal thread and a second, internal section 55b is equipped with a larger internal diameter.
  • the bores 57 and 59 are also designed as stepped bores.
  • the honing stone 41 is penetrated by a through hole 55. which is designed here as a stepped bore because part of the adjusting device 71, namely the second adjusting means 75, is accommodated in the honing stone 41.
  • the lower part of the bore 55, the area 55b is provided with a larger inner diameter.
  • the upper region 55a has a smaller inner diameter and is provided with an internal thread in order to be able to interact with the first adjusting means 73, an adjusting screw.
  • the second adjusting means 75 can also be displaced into the base body of the third processing stage in order not to weaken the honing stone 41 too much. This then eliminates the lower section 55b of the bore 55,
  • FIG. 5 shows the side surface 69, into which at least one clamping groove 91 is made for the at least one clamping claw, ie here for the clamping claws 61 and 63.
  • This has a clamping surface 93 which, viewed from the bottom upwards, is inclined to an imaginary central plane M of the honing stone 41.
  • the angle corresponds to the angle ⁇ between the side surface 69 and the base of the clamping surface 93, which is shown in FIG. 5.
  • the angle ⁇ is 10 °.
  • the tool 1 is used to machine precision bores in workpieces, on the one hand producing an exact bore geometry with regard to diameter, roundness and cylindrical shape, but on the other hand also providing a surface structure that can be optimally adapted to the function of the bore. It is therefore possible to ensure that bearings installed in the bore are held securely. In particular, however, it is possible to design the surface structure in such a way that a lubricating film is formed in the area of lubricating sliding surfaces.
  • the tool 1 has a modular structure and has two processing stages 3 and 5, each with at least one cutter plate 5 and 11, which show geometrically determined cutting edges 7, 13. These are used to machine the surface of the precision bore and to generate the desired bore geometry. If the tool 1 is inserted into a bore to be machined, the frontmost first machining stage 3 first comes into engagement with the bore wall, then the second machining stage 9. Since the first machining stage 3 and the second machining stage 9 are aligned very precisely to one another and to the third machining stage 15 with the help of the first two processing stages, the precision bore can be pre-machined and precisely machined. The dimensional deviation of the machined precision bore compared to the nominal dimension after the intermediate machining is approx. 1/100 mm to 2/100 mm.
  • the wall of the precision bore is machined using the third machining stage 15, which has at least one geometrically undetermined cutting edge 17, which is designed here as a honing stone 41.
  • the Honing stone is either made entirely of hard material particles or has at least 45 hard material particles in the area of its outer surface, which come into engagement with the bore to be machined.
  • the tool 1 is initially set in rotation, while the first and second machining stages 3 and 9 machine the precision bore.
  • a superimposed movement of an axial speed, also referred to as feed, and a peripheral speed (tangential speed) is moved in the bore of the tool 1.
  • the direction of the axial speed is periodically reversed, so that the tool 1 in the precision bore to be machined in the axial direction.
  • Direction is moved back and forth.
  • the direction of rotation of tool 1 is maintained during machining.
  • the resulting surface can be influenced by varying the speed ratio of the axial speed / peripheral speed in order to produce a desired pattern of machining grooves.
  • the third processing stage 15 After finishing with the third processing stage 15, only about 1/100 mm to 2/100 mm have to be removed after all. Since the third processing stage 15 is very precisely aligned with the second processing stage 9 and the first processing stage 3, the cardanic suspension customary for honing tools can be dispensed with. It is therefore possible to rigidly connect the third machining stage 15 to the other machining stages 9 and 13 and via the shaft 19 to a machine tool. Because of the small oversize remaining for the finishing, the third machining stage 15 only has to be moved back and forth in the precision bore to be machined in the axial direction one to three times. This shortens the processing time. of precision drilling sustainable.
  • the tool 1 has a coolant / lubricant supply, which supplies at least the third processing stage 15, so that the medium from the bores 55, 57 and 59 in the skirt 41 into a coolant introduced into the outer surface 45 thereof.
  • Lubricant groove 53 can get.
  • the coolant / lubricant supply can also extend into the second and first processing stages 9, 3 in order to supply coolants and lubricants to the respective cutting edges 7, 11 when machining a bore surface through basically known channels.
  • the third machining stage can be supported in the machined bore surface with the aid of the guide strips 49, 49 ', 47, 47'. It is also possible to insert more than one honing stone into the peripheral surface 43 of the third processing stage 15. It is of crucial importance that the modular construction of the tool 1 enables the precision bore to be machined in a single machining step without changing the tool with the aid of the geometrically determined cutting edges and with the aid of the honing stone having a geometrically undefined cutting edge.
  • the alignment of the processing stages 3, 9 and 15 with respect to one another is very precise, because short cone tension ensuring high rigidity is realized at the individual connection points by the shaft 23 of the second processing stage 9 being able to engage in a recess 81 of the third processing stage 15, in the region of the Connection point, the end face 21 and the flat surface 25 cooperate with each other, which leads to an exact radial alignment and angular alignment of the second machining stage 9 with respect to the third machining stage 15. Accordingly, a high degree of rigidity and an exact alignment of the first machining stage 3 with respect to the second machining stage i9 are achieved by shank 29 in a corresponding one .
  • the tool 1 has three processing stages.
  • the advantages mentioned above can also be easily realized with a tool that is only provided with two processing stages.
  • the first processing stage 3 used for the preliminary processing which was explained with reference to FIG. 1, can be dispensed with.
  • Such a tool 1 ' is shown in FIG. 6. It has a first machining stage 9 'and a second machining stage 15', the first machining stage 9 'of the second machining stage 9 of the tool 1 of the figure. 1 corresponds.
  • the first processing stage 3 of the tool 1 according to FIG. 1 is omitted in the embodiment of the tool V according to FIG. 6.
  • the first processing stage 9 'of the tool 1' is essentially constructed in the same way as the second processing stage 9 of the tool 1 in FIG. 1. Reference is therefore made to the description of this processing stage according to FIG. 1.
  • the second processing stage 9 ' has a number of knife plates, of which here the knife plates 11, 11' and 11 "with reference numbers are marked far away.
  • the first processing stage 9 ' can be coupled to the second processing stage 15' via a precision interface, which is also designed here as a short cone connection.
  • first processing stage 9 ' it should be noted that, like the processing stages 3 and 9 of the tool 1 according to FIG. 1, it has a number of cutting inserts.
  • the geometrically determined cutting edges of the knife inserts can also be implemented directly on the base body of the respective processing stages. However, it is more cost-effective to use interchangeable cutting inserts than to implement geometrically determined cutting edges directly on processing stages 3, 9 and 9 'of tools 1 and V.
  • At least one of the processing stages 3 and 9 at least three support areas are provided, via which the tool 1 is supported directly when machining a precision bore on the bore wall, without any other for guiding the tool Management facilities would be required.
  • support area is used very generally in connection with the explanations given here. It is assumed that when machining a bore surface by means of a geometrically determined cutting edge, reaction forces are introduced into it, which are based on the cutting forces exerted by the cutting edge. The reaction forces act on the tool, which is supported on at least two further support surfaces on the bore wall and is guided through it.
  • single-cut reamers are known with a geometrically determined cutting edge usually implemented on a cutting insert and two guide strips, of which a first, viewed in the direction of rotation of the tool, lags the cutting edge by approximately 40 ° and a second one is arranged opposite the cutting edge.
  • support area is therefore not only addressed to surfaces which, like guide strips, slide along the surface of the machined precision bore. Rather, cutting edges are also detected that remove chips from the surface of the bore.
  • two-edge tools in addition to the two cutting edges, two-edge tools also have three guide strips, by means of which the tool is supported on a bore surface, without any intervention in the surface in the area of the guide strips.
  • the support areas mentioned here can be realized in that the processing stages 3 and / or 9 of the tool 1 according to FIG. 1 and the processing stage 9 'of the tool 1' according to Figure 6 has three cutter plates with which the tool 1, 1 'is supported on the bore wall.
  • the second processing stage 9 comprises, for example, six to eight knife inserts.
  • six to eight geometrically determined cutting edges can also be implemented directly on the base body of the machining stage. The same applies to the machining stage 9 'of the tool 1' according to FIG. 6.
  • the rounded bevels of the cutting edges form the support areas for the machining stage.
  • At least one geometrically undefined cutting edge preferably at least one honing stone 41 '
  • the geometrically undefined cutting edges having.
  • Honing stones are generally known, so they are not explained in more detail here.
  • guide strips can be provided for the processing stage 15 ′ equipped with honing stones, as was explained above in connection with the tool 1.
  • the exemplary embodiment of the tool 1 'according to FIG. 6 is characterized in that the desired surface structure mentioned above can be realized when machining a precision bore, because here, in addition to geometrically defined cutting edges, geometrically undetermined cutting edges are used.
  • the modular structure using precision cut parts ensures that an exact axial alignment and angular alignment of the machining stages of the tool 1, V is guaranteed.
  • Figure 7 shows a knife plate 11 in a perspective view obliquely from the front. Irrespective of the specific shape of the knife insert 11, this always has a main cutting edge 113 which drops in the direction of the direction of advance indicated by an arrow 111. Declining here means that the main cutting edge, viewed in the feed direction, approaches the axis of rotation, not shown here, of the machining step.
  • the main cutting edge 113 merges with the secondary cutting edge 117 via an apex 115. This is inclined in the opposite direction and, viewed in the feed direction, rises in the direction of the apex 115. It can thus be seen that the main cutting edge 113 and the secondary cutting edge 117 are inclined in opposite directions from the apex 115.
  • the cutter plate 11 is arranged in FIG. 7 such that a rake face 119 is on top, on which the chips removed from the main and secondary cutting edge run. It merges into the main and minor cutting edges 113, 117.
  • a first free surface 121 is provided, which is inclined at an angle of less than 90 ° with respect to the rake surface 119, that is to say does not drop vertically downwards in FIG. 7.
  • a first free surface 123 adjoins the secondary cutting edge 117.
  • a single-cutting reamer has three support areas.
  • At least three guide strips can also be used in connection with cutting edges that do not have a bevel.
  • the round bevel is realized in the area of the first free surface 123 of the secondary cutting edge 27. This area is then curved so that a curved area adjoins the rake face 119, the radius of curvature of which is measured from the axis of rotation of the tool 1, 1 '.
  • the radius of curvature preferably corresponds to that of the precision bore to be machined.
  • the first free surface 121 of the main cutting edge 113 is adjoined by a second free surface 125 that slopes at a steeper angle than the first free surface 121.
  • a second free surface 127 adjoins the first free surface 123 of the secondary cutting edge 117, which is also more inclined , as the first open space 123.
  • the second open areas 125, 127 are preferably flat, as is often the case with conventional knife inserts.
  • main cutting edge 113 and the secondary cutting edge 117 are realized directly on the base body of a machining step, the configuration of the area of the main cutting edge and the secondary cutting edge is also provided there, as was described with the aid of the cutter plate 11.
  • a rounded bevel can also be provided in the area of the first free surface 123 of a secondary cutting edge 117 in order to realize a support area.
  • the tool 1 according to FIG. 1 and the tool 1 'according to FIG. 6 have at least three support areas in the area of a machining step with at least one geometrically determined cutting edge.
  • the at least three support areas on one or both processing stages of the tool 1 according to FIG. 1 and on the processing stage 9 'of the tool 1' according to FIG. 6 can thus be implemented in the manner described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un outil pour l'usinage par enlèvement de copeaux de trous de précision dans des pièces, comprenant un premier degré d'usinage présentant au moins une coupe géométriquement déterminée et, un second degré d'usinage présentant au moins un listel de pierrage de coupe géométriquement indéterminée. Cet outil est caractérisé en ce que le premier degré d'usinage présente au moins trois zones d'appui prévues à distance les unes des autres en direction périphérique, lesquelles sont configurées et disposées de manière à prendre appui, lors de l'usinage du trou de précision, sur sa paroi.
EP05707231A 2004-02-10 2005-02-05 Procede d'usinage par enlevement de copeaux de trous de precision Withdrawn EP1718430A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004008166A DE102004008166A1 (de) 2004-02-10 2004-02-10 Werkzeug zur spanenden Bearbeitung von Präzisionsbohrungen
PCT/EP2005/001189 WO2005077575A2 (fr) 2004-02-10 2005-02-05 Procede d'usinage par enlevement de copeaux de trous de precision

Publications (1)

Publication Number Publication Date
EP1718430A2 true EP1718430A2 (fr) 2006-11-08

Family

ID=34832832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05707231A Withdrawn EP1718430A2 (fr) 2004-02-10 2005-02-05 Procede d'usinage par enlevement de copeaux de trous de precision

Country Status (4)

Country Link
US (1) US7717651B2 (fr)
EP (1) EP1718430A2 (fr)
DE (1) DE102004008166A1 (fr)
WO (1) WO2005077575A2 (fr)

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JP2011505263A (ja) * 2007-12-06 2011-02-24 マパル ファブリック フュール プラツィジョンズベルクゼウグ ドクトル．クレス カーゲー 被加工物の切削加工用の工具
WO2010054637A1 (fr) * 2008-11-12 2010-05-20 Gühring Ohg Outil de finition d'alésage par enlèvement de copeaux, à plusieurs tranchants
US9028178B2 (en) * 2009-06-30 2015-05-12 Sandvik, Inc. Multi-effective material removal tool
DE102009042395A1 (de) * 2009-09-16 2011-03-24 Hartmetall-Werkzeugfabrik Paul Horn Gmbh Reibwerkzeug zur spanenden Bearbeitung eines Werkstücks
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WO2021228802A1 (fr) * 2020-05-12 2021-11-18 Diahon Werkzeuge Gmbh & Co. Kg Outil combiné pour l'usinage fin d'alésages
CN116810391B (zh) * 2023-07-05 2024-02-09 东莞市同进刀具科技有限公司 一种具有导向功能的铣铰刀具

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Also Published As

Publication number Publication date
WO2005077575A3 (fr) 2005-11-24
WO2005077575A2 (fr) 2005-08-25
US20070172322A1 (en) 2007-07-26
DE102004008166A1 (de) 2005-09-08
US7717651B2 (en) 2010-05-18

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