WO2023089025A1 - Outil de pierrage et procédé de production d'un outil de pierrage - Google Patents

Outil de pierrage et procédé de production d'un outil de pierrage Download PDF

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Publication number
WO2023089025A1
WO2023089025A1 PCT/EP2022/082268 EP2022082268W WO2023089025A1 WO 2023089025 A1 WO2023089025 A1 WO 2023089025A1 EP 2022082268 W EP2022082268 W EP 2022082268W WO 2023089025 A1 WO2023089025 A1 WO 2023089025A1
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WO
WIPO (PCT)
Prior art keywords
cutting
cutting means
tool
tool body
honing
Prior art date
Application number
PCT/EP2022/082268
Other languages
German (de)
English (en)
Inventor
Oliver Bachmann
Giorgio IANNUZZI
Robert Kapp
Florian KRANICHSFELD
Joachim Weiblen
Original Assignee
Elgan-Diamantwerkzeuge Gmbh & Co. 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 Elgan-Diamantwerkzeuge Gmbh & Co. Kg filed Critical Elgan-Diamantwerkzeuge Gmbh & Co. Kg
Publication of WO2023089025A1 publication Critical patent/WO2023089025A1/fr

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Classifications

    • 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
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • 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
    • B24B33/083—Honing tools with different sets of honing stones
    • 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
    • B24B33/084—Honing tools having honing stones at the end of bars

Definitions

  • the invention relates to a honing tool for machining a bore in a workpiece according to the preamble of claim 1.
  • the invention also relates to a method for producing a honing tool.
  • Honing is a machining process with geometrically undefined cutting edges, which is carried out with an expandable honing tool.
  • the honing process works with bonded cutting grain with constant surface contact between the abrasive working surface of the honing tool and the bore surface.
  • the cutting grains are bound in a bond system (also referred to as "bond") and together with the bond system form an abrasive cutting surface.
  • the binding system has the task of holding the bound cutting grains in place until they are blunted by the cutting process. Then they should be released so that new, still sharp-edged cutting grains can engage with the workpiece (self-sharpening effect).
  • the honing tool In a typical honing operation, the honing tool is moved back and forth within the bore to be machined in the axial direction of the bore and at the same time rotated at a suitable speed to produce a rotary motion superimposed on the lifting motion.
  • the cutting means attached to the honing tool are pressed against the inner surface to be machined via the infeed system with a pressure force acting radially to the tool axis.
  • the effective outer diameter of the honing tool is gradually increased by the infeed system.
  • the delivery is therefore also referred to as "expansion", the delivery system also as “expansion system”.
  • a cross-hatch pattern typical of honing with crossing traces of processing which are also referred to as “honing marks”, usually occurs on the inner surface.
  • a honing tool of the type considered in this application is a honing tool with double infeed or with double expansion, i.e. a honing tool that has two independent has cutting groups that can be delivered from one another. This means that multi-stage machining processes can sometimes be carried out without changing tools.
  • a first cutting group has a plurality of radially advanceable first cutting material carriers which cover a circumferential angle range of at least 20° on a radial outside and carry on the outside a single first cutting means which is wide in the circumferential direction or several narrow first cutting means which are arranged at a mutual distance from one another.
  • a second cutting group has a plurality of second cutting means carriers which can be advanced radially and which each carry a single, narrow second cutting means in the form of a cutting strip on their radial outside. All of the cutting means of the first and second cutting groups are located in an axially short cutting area having a length measured in the axial direction which is substantially smaller than an effective outer diameter of the cutting groups when the cutting means is fully retracted.
  • WO 2018/149696 A1 discloses, among other things, honing tools with a double expansion.
  • the cutting means are fastened directly to the associated cutting means carrier and are rigidly connected to the cutting means carrier, without the interposition of an elastic intermediate layer.
  • the cutting means are individually flexibly attached to the associated cutting means carrier via an elastic intermediate layer.
  • the honing tool is a honing tool with double feed or double expansion, which means that two independently feedable cutting groups are attached to the tool body.
  • Each of the cutting groups comprises a plurality of cutting-means carriers which can be radially infed together by axial displacement of the associated infeed element or expansion element.
  • a special feature is that the tool body has fourteen or more guide openings. The guide openings have an unequal angular spacing in such a way that one or more of the guide openings have unequal angular distances to the two guide openings that are immediately adjacent in the circumferential direction.
  • Directly adjacent means in particular that no guide strip is arranged between directly adjacent guide openings. Differences in the angular distances can, for example, be on the order of about 1° or more, for example in the range from 0.8° to 3°.
  • Honing tools according to this formulation of the invention differ from conventional honing tools with double infeed, among other things, by the large number of fourteen or more guide openings, in each of which a single cutting means carrier can be inserted, the outer side of which, in the circumferential direction, is relatively wide can be occupied by cutting means.
  • increased cutting strip surfaces are thus possible in the sense that larger parts of the circumference can be covered with cutting means.
  • the uneven angular pitch which differs from classic angular pitches.
  • a classic angular division is an angular division in which the guide openings are distributed evenly over the circumference of the tool body, so that, for example, there are twelve guide openings each with an angular spacing of 30° or eight guide openings each with an angular spacing of 45° or six guide openings each with an angular spacing of 60°.
  • honing tools of this type can be used particularly flexibly and advantageously for various applications and can produce very good results in terms of shape and surface quality.
  • it was possible to achieve more uniform surface characteristics which is attributed, among other things, to the possibility of relatively high surface proportions of cutting media and the resulting lower specific contact pressures required.
  • comparatively long service lives result from increased cutting surface areas over the circumference.
  • the large number of guide openings in connection with the non-uniform angular division between the guide openings opens up the possibility of configuring such honing tools very flexibly for different applications by equipping the tool body with appropriately divided and designed cutting means carriers.
  • Different first and second cutting groups can thus be formed, the group members of which can be expediently distributed over the circumference with different degrees of symmetry or asymmetry.
  • the asymmetry of the angular pitch seems to reduce the tendency to generate vibrations during honing, which has a positive effect on the form and surface qualities that can be achieved.
  • the number of guide openings is preferably an even number, ie a number that can be divided by two, guide openings being arranged in pairs diametrically opposite one another with respect to the tool axis. If identical cutting tool carriers are attached to the tool body at pairs of diametrically opposite points with cutting tools attached in an identical manner, which belong to the same cutting group and are therefore fed together, the tool position in the bore is stabilized, which has an advantageous effect on the bore quality.
  • the tool body may have exactly 14 (fourteen) pilot holes, or exactly 18 (eighteen) pilot holes, or exactly 22 (twenty-two) pilot holes. These can be distributed over the circumference of the tool body in such a way that there is twofold rotational symmetry about the tool axis, but no mirror symmetry with respect to a plane containing the tool axis. So some degree of asymmetry is possible.
  • Honing tools with different distributions of cutting means carriers between the first and the second cutting group are possible within the scope of the claimed invention.
  • the term “pitch” is intended to denote the number of guide openings, so that a “pitch of 14" corresponds to a honing tool with 14 guide openings distributed over the circumference.
  • the term “angular pitch” refers to the angular distances between the guide openings measured in the circumferential direction. The angular distances between the in Circumferentially lying centers of adjacent guide openings measured.
  • An uneven angular division then means, among other things, that the unequal angular distances between immediately adjacent guide openings differ to an extent that is clearly outside the manufacturing tolerances, so that unequal angular distances can mean, for example, at least 1° angular difference.
  • the distribution of the cutting means carriers between the first and second cutting group is made such that, with a total number of T cutting means carriers, one cutting means group has a number of T/2-1 cutting means carriers and the other cutting group has a number of T/2+1 cutting means carriers.
  • one cutting group has exactly six and the other cutting group has exactly eight cutting means carriers.
  • the honing tool has a guide assembly with a plurality of non-cutting guide pads, which are arranged on the tool body distributed according to a non-uniform angular pitch over the circumference of the tool body.
  • non-cutting guide strips are preferably arranged in pairs diametrically opposite one another on the tool body in such a way that tool body segments which lie between directly adjacent guide strips in the circumferential direction have different circumferential widths in pairs.
  • the division is such that in the tool body segments with the greater circumferential width, a number N and in the tool body segments with the smaller circumferential width, a number N ⁇ 1 of guide openings are arranged directly next to one another.
  • the guide openings and/or the cutting-means carriers have an axial length that is greater than 50% of the maximum effective outer diameter of the honing tool.
  • the axial length can be more than 80% of this outside diameter, it can possibly be larger than this outside diameter.
  • a correspondingly axially long cutting area can thus be realized.
  • the support sections have several, preferably two, three or four, mutually parallel receiving grooves on their outer sides for receiving a strip-shaped cutting means unit (cutting strip) exhibit.
  • a cutting means unit can, for example, comprise a narrow plate-shaped base made of metal, on which the actual cutting means coating (cutting grains in a corresponding bond) is applied directly or with an adhesive layer or the like in between.
  • the cutting means can be fitted with cutting means of different widths. Equipping with a single relatively long individual bar is also possible.
  • the receiving grooves do not have to be equipped with cutting-means units that essentially fill the entire length of a receiving groove. It is also possible to fasten a significantly shorter strip-shaped cutting means unit in a long receiving groove, for example with a length that corresponds to less than 50% of the axial length of the carrier section. Honing tools of this type can thus also be configured in such a way that all the cutting means are accommodated in an axially relatively short cutting area, the axial length of which can be smaller than the effective outside diameter of the honing tool.
  • honing tools can be advantageous, for example, when it comes to machining and/or producing bottle-shaped, cone-shaped or barrel-shaped bores.
  • the invention also relates to a method for producing a honing tool for machining an inner surface of a bore in a workpiece.
  • a tool body which is designed in accordance with the claimed invention, is equipped with a large number of cutting-means carriers of the type described and associated infeed elements. By equipping the tool body with cutting tool carriers and infeed elements, different configurations of the honing tool can be implemented, which can be well adapted to the respective machining task.
  • FIG. 1 shows an oblique perspective view of a honing tool according to an embodiment of the invention
  • Fig. 2 shows a longitudinal section in a plane that leads centrally through guide openings.
  • FIG. 3 shows a longitudinal section in a plane that leads centrally through guide rails and measuring nozzle bores
  • FIGS 5 to 8 show different configurations for loading the honing tool
  • 9 to 13 show different options for equipping cutting means carriers with cutting means.
  • FIG. 1 shows an oblique perspective representation of a honing tool 100 according to an embodiment of the invention.
  • Fig. 2 shows a longitudinal section in a plane that leads centrally through guide openings.
  • Fig. 3 shows a longitudinal section in a plane that runs centrally through guide rails and measuring nozzle bores. 4 shows a section perpendicular to the tool axis through the untipped tool body.
  • the honing tool is suitable and intended for machining the inner surface of a bore in a workpiece by means of honing and, in the example, is designed to hone cylinder running surfaces in the manufacture of cylinder blocks or cylinder liners for reciprocating engines.
  • the honing tool can be used flexibly and can be prepared or configured for a wide variety of machining tasks in just a few simple steps.
  • the honing tool can, for example, be used in various configurations for machining circular-cylindrical bores, i.e. rotationally symmetrical bores without an axial contour. With other configurations, it can also be used to machine rotationally symmetrical bores that have bore sections of different diameters and/or different shapes, for example bottle-shaped bores, barrel-shaped bores and/or bores that have at least one have conical bore section with axially continuously variable diameter.
  • the honing tool has a material body 110 made from a steel material, which defines a tool axis 112, which is also the axis of rotation of the honing tool during honing.
  • a coupling structure 120 for coupling the honing tool to a drive rod or a work spindle of a honing machine or another processing machine which has a work spindle which can be rotated around the spindle axis and oscillated back and forth parallel to the spindle axis .
  • the coupling structure 120 is designed as a functional part of a bayonet connection.
  • a hollow shank taper or other taper type coupling structure may be provided.
  • the cutting area 130 of the honing tool In the end section of the tool body facing away from the coupling structure 120 or the working spindle (not shown), there is the cutting area 130 of the honing tool, in which all abrasive cutting means (in the form of cutting strips, general reference number 170) are attached.
  • the cutting area 130 is arranged more or less flush with the end of the tool body remote from the spindle in the end section of the tool body facing away from the spindle, so that blind holes can also be machined down to the bottom of the hole if necessary.
  • Within the cutting area 130 there are many strip-shaped cutting means 170 (hereinafter also referred to as cutting strips) distributed around the circumference of the tool body.
  • the length LSB of the cutting area is between 80% and 95% of the outer diameter AD of the honing tool.
  • the outer diameter is of the order of 80 mm, it can be in the range of 60 mm to 90 mm, for example, but possibly also above or below.
  • the honing tool 100 has an integrated joint 190, with the aid of which the tool body 110 is coupled in a limited manner to the connection piece, which is used for connection to the work spindle of the processing machine.
  • the joint 180 is designed as a ball joint, in which the joint ball 192 is formed at the lower end of the connection piece, while the corresponding bearing elements are attached with concave spherical bearing surfaces inside the tool body 110 .
  • the honing tool 100 in FIG. 1 is a double flare honing tool.
  • a guide bore 115 runs coaxially to the tool axis 112 to accommodate two tool-side infeed elements (or expansion elements).
  • a tubular first feed element 140-1 and a second feed element 140-2 guided coaxially therein are inserted into the guide bore. These are independently axially displaceable.
  • Each of the feed elements has two axially offset conical sections 142-1 and 142-2, which are referred to here as feed cones or expansion cones and whose lateral surfaces form an axially displaceable inclined surface of the feed system.
  • the tool body has a plurality of axially elongate guide openings (general reference numeral 160) leading radially to the tool axis from the guide bore 115 to the outside of the tool body.
  • fourteen guide openings 160 are formed, which are circumferentially distributed according to an uneven angular pitch.
  • An uneven angular division means here, among other things, that one or more of the guide openings have unequal angular distances to those guide openings that are immediately adjacent in the circumferential direction without an intermediate guide strip.
  • Non-deliverable, non-cutting guide strips 190-1 to 190-4 of a guide group are arranged diametrically opposite one another in pairs on the outside of the tool body.
  • the guide pads are distributed with an uneven angular pitch, so that tool body segments that lie between immediately adjacent guide pads in the circumferential direction have different circumferential widths in pairs.
  • For the narrower WS-S tool body segments these are around 78° and for the wider WS-B tool body segments around 102°.
  • the guide group has a two-fold rotational symmetry with respect to the tool axis.
  • Two diametrically opposed guide rails 190-1 and 190-3 are designed as measuring rails. In the part of the cutting area that is farther from the coupling, they have a measuring area with three radial bores 195 that are offset axially relative to one another, which can be used as measuring nozzles of a pneumatic diameter measuring system. Do you want one measure a specific measuring level, the radial bores in this level are opened and the unused radial bores are closed.
  • Each of the guide openings defines a center plane 162 containing the tool axis 112, which lies centrally between the parallel lateral boundary surfaces of the guide opening.
  • the angular distance WA to an immediately adjacent guide opening corresponds to the angular distance between the center planes of the guide openings that are adjacent to one another.
  • the central guide opening 160-4 has the same angular spacing of approximately 22° from the guide openings 160-3 and 160-5, which are adjacent in both directions in the circumferential direction.
  • the two middle guide openings 160-14 and 160-1 are at an angular distance of 22° from one another, while the guide openings 160-2, 160 -13 there is an angular distance of approx. 23°.
  • the angular distance to the two guide openings that are directly adjacent in the circumferential direction is different.
  • the differences in the angular distance (approx. 1°) are well outside the manufacturing tolerances and in the order of a few percent (e.g. from 2% to 5%) of the absolute value of the angular distance.
  • this uneven angular distribution is also found on the opposite side, i.e. in the other, wider tool body segment.
  • Those guide openings that are only indirectly adjacent to one another with an intermediate guide strip each have an angular spacing of approximately 34°.
  • the angular distribution of the guide openings over the circumference is characterized by three different values for angular distances, namely four times approximately 22°, twice approximately 23° and four times approximately 34°. In this respect, too, there is an uneven or asymmetrical angular division.
  • the tool body 110 carries a multiplicity of cutting-means carriers (general reference number 150).
  • the cutting means carriers are in each case one-piece components made of steel material, which are essentially rigid in themselves.
  • Each of the cutting means carriers has a carrier section 152 which is relatively wide in the circumferential direction and which has on its outside a plurality of, preferably two, three or four, mutually parallel receiving grooves 156 lying in a common plane for receiving each have a strip-shaped cutting means unit.
  • the circumferential width of the carrier sections is in the range from approx. 15° to approx. 20°.
  • an infeed section 158 which is initially plate-shaped and then slightly narrows, protrudes inwards.
  • the plate-shaped part of the infeed section 158 sits radially movable in the essentially rectangular guide opening 160 of the tool body, so that a radial movement (radial to the tool axis 112) is possible, but tilting movements in the transverse direction thereto are largely avoided.
  • the cutting element carriers are prestressed into the inwardly retracted position by means of two encircling coil springs, so that the radial delivery to the outside takes place against the force of these return springs.
  • all the cutting means are designed as cutting strips which are narrow in the circumferential direction and whose width BS measured in the circumferential direction is small compared to the axial length LS.
  • An aspect ratio between length LS and width BS can be in the range from 4:1 to 55:1, for example.
  • the axial length LS almost as large as the maximum effective outer diameter AD of the honing tool.
  • the honing tool 100 can be configured for different machining tasks without great effort. Two steps are usually necessary for a specific configuration.
  • a first step includes equipping the tool body 110 with cutting means carriers that are equipped with suitable cutting means. The cutting means carriers are inserted from the outside into the guide openings 160 provided for them in the desired distribution for the two cutting groups.
  • the configuration comprises, as a second step, the installation of corresponding first and second delivery elements.
  • this is relatively easy because the feed elements are only secured against falling out and held in their position in the installed state by two screws engaging radially inwards. If the feed elements are to be exchanged, the retaining screws can be unscrewed and the feed elements attached to the free front side of the Tool body are removed from this. Feed elements suitable for the desired configuration can then be inserted into the guide bore 115 and secured against falling out by screwing in the retaining screw.
  • FIGS. 9 to 13 illustrate different possibilities for equipping the cutting means carrier 150 with a suitable number of receiving grooves and for equipping the receiving grooves with different distributions and types of cutting strips.
  • the honing tool comprises a first cutting group, the cutting means carriers of which are fed together via a first feed element 140-1, and a second cutting group, the cutting means carriers of which are fed together via the second feed element 140-2.
  • the infeed sections of the cutting means carriers of the first cutting group are each marked in black, while the infeed sections of the second cutting group appear light.
  • receiving grooves 156 which are rectangular in cross-section, on the carrier sections of the cutting-means carriers.
  • cutting means carriers are shown with either three or four equidistant receiving grooves of the same dimensions.
  • the cutting-means carriers 150 of the first cutting group each have three comparatively wide receiving grooves, while the cutting-means carriers of the second cutting group each have four somewhat narrower receiving grooves.
  • Other divisions are possible.
  • the same number of receiving grooves (e.g. two, three or four) can be provided everywhere.
  • the first cutting group comprises six cutting-means carriers, while the second cutting group comprises eight cutting-means carriers.
  • the number of receiving grooves on the cutting means carriers thus corresponds in each case to half the number of cutting means carriers in a cutting group.
  • this division leads to the cutting means carriers of the first cutting group per carrier unit covering a larger part of the circumferential width with cutting means than the cutting means carriers of the second cutting group, where accordingly a smaller proportion of the circumferential surface of the Cutting means carrier is covered with cutting means.
  • the condition is met that the cutting means carriers of the cutting group that has fewer cutting means carriers, the outer surface of which is covered more densely with cutting means, viewed in the circumferential direction, than the cutting means carriers of the group with a greater number.
  • the equipment can also be exchanged.
  • FIG. 5 shows a first configuration of the division of the first and second cutting groups.
  • all the cutting means carriers of the first cutting group are arranged in groups of three directly next to one another, that is to say without intervening cutting means carriers of the second cutting group.
  • the four cutting means carriers per side of the second cutting group are also located directly next to each other.
  • the members of the first cutting group are located in the narrower tool body segments WS-S between the guide pads that are closer together.
  • the first cutting group thus has 18 cutting strips and the second cutting group has 32 cutting strips.
  • the first cutting group thus has 18 cutting strips and the second cutting group has 32 cutting strips.
  • 9 to 13 show examples of different options for the assignment of receiving grooves, which can be selected here.
  • the configuration of FIG. 5 may also be referred to as "shell splitting." This division can be used, for example, when machining cylinder liners.
  • the angular distances to the immediate neighbors of the same cutting group are the same in each case.
  • the angular division varies within the second cutting group, since there both an angular distance of 22° and an angular distance of 23° occur.
  • the non-uniform angular pitch between adjacent tool carriers can contribute to reducing the tendency to chatter during machining, as well as solving overlapping problems in so-called spiral honing, in which relatively high honing angles (up to, for example, in the order of 140°) is worked.
  • FIG. This can also be referred to as "light shell division".
  • a characteristic of this division is that within the larger tool body segments WS-B (where four guide openings are next to each other) cutting tool carriers of the different groups lie alternately next to each other, so that each cutting tool carrier has direct neighbors of the other cutting group. In the narrower tool body segments (with three guide openings per side) there is a pair of adjacent cutting means carriers of the second cutting group and additionally one of the first cutting group.
  • a third configuration is shown in FIG.
  • the cutting-means carriers of the two cutting groups are nested or mixed into one another.
  • the different cutting tool holders are arranged alternately next to each other, while in the wider tool body segments WS-B (with the four guide openings) two cutting tool holders of the first cutting group are arranged in the middle directly next to each other are.
  • This configuration results in a pairwise symmetrical division of the second cutting group.
  • This configuration can be used with particular advantage when processing unstable components.
  • FIG. 8 A fourth configuration is shown in FIG. 8, which can be referred to as a “nearly symmetrical” split.
  • the cutting means carriers of the different groups are arranged alternately next to one another in the circumferential direction. This results in a relatively uniform distribution in almost regularly distributed areas of the circumference both in the first cutting group and in the second cutting group.
  • the arrangement is not completely symmetrical due to the different angular distances between adjacent guide openings, but there is a proportion of asymmetry which, according to the inventors' observations, significantly reduces the generation of vibrations during machining compared to more symmetrical arrangements.
  • this division of the cutting tool carrier can geometric weak points of Cylinder bores are well bridged, resulting in better shape and roundness values.
  • the cutting means carriers can be variably fitted with cutting means of different widths and/or with different numbers of cutting means and/or with cutting means of different lengths.
  • 9 to 13 show a small selection.
  • at the top left (partial figure A) is an axial view
  • at the top right (partial figure B) is a side view
  • at the bottom left (partial figure C) is a plan view
  • at the bottom right (partial figure D) is an isometric view of a cutting means carrier with cutting strips attached thereto (a or more) shown.
  • 9 and 12 show examples in which a cutting means carrier with several (three or four) receiving grooves is occupied with only a single individual strip of the cutting means.
  • FIG. 11 shows an example in which all three receiving grooves of a cutting-means carrier are occupied by relatively wide cutting strips, which essentially extend over the entire length.
  • Assemblies of the type shown in FIGS. 9, 11 and 12, ie with relatively long cutting strips that cover the greater part of the cutting area, are particularly well suited for machining and/or producing circular-cylindrical bores.
  • FIG. 10 shows an example of an assembly in which a cutting means carrier is equipped with four long, narrow receiving grooves with four relatively short cutting strips whose axial length is less than half the axial length of the receiving grooves.
  • the arrangement ensures that the areas covered with cutting tool are in the immediate vicinity of the free end of the honing tool.
  • Such a tool can be used particularly well in so-called contour honing in order to machine or produce rotationally symmetrical bores with a bore shape that deviates from a circular cylinder, for example with a bottle shape, barrel shape or a tapered shape.
  • the cutting means carrier 150 which has a T-shaped cross section, has three receiving grooves. The middle one is fitted with a single long cutting bar (over a substantial axial range, eg over 80% to 100% of the length of the receiving groove). Two relatively short cutting strips (e.g. approx. 10 mm to 15 mm to the left and right of the long cutting strip) are installed at the end to be attached away from the spindle.
  • This arrangement is useful, for example, for workpieces with very little overflow, e.g. monoblocks, i.e. cylinder blocks with a cylinder head already cast in. Usually the overflow of these workpieces is less than 5 mm. In this application it is helpful to have more cutting material available in the lower area of the carrier in order to avoid a diameter drop in the lower area of the bore just before the start of the honing overflow.
  • Very stable bores can be honed with a "shell arrangement" (see e.g. Fig. 5).
  • This has the advantage that the tool run is very smooth and a possible tendency to chatter is prevented.
  • a shell arrangement has proven to be useful for the first honing stage (roughing or pre-honing), especially with coated bores, since the geometric errors after coating are not insignificant.
  • the shell arrangement prevents individual slats from cutting free and swinging open, since the opposing angular areas of the support slats are relatively narrow and the slats “tighten” one another accordingly.
  • the axial position of the measuring nozzles and the measuring level determined thereby can be adapted to the corresponding requirements.
  • the axial position can be selected in such a way that it is approximately in the middle of the area covered with cutting means.
  • the honing tool can be easily adapted to different machining tasks. Due to its flexibility of use, it is also very well suited as a test tool.

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  • Mechanical Engineering (AREA)
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  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

L'invention concerne un outil de pierrage (100) pour usiner la surface interne d'un alésage dans une pièce au moyen d'au moins une opération de pierrage, comprenant : un corps d'outil (110) qui définit un axe d'outil (112) et a un alésage de guidage (115), qui est coaxial à l'axe d'outil, pour recevoir deux éléments d'ajustement qui peuvent être déplacés axialement indépendamment l'un de l'autre, et une pluralité d'ouvertures de guidage (160) qui sont réparties sur la circonférence du corps d'outil (110) et mènent radialement par rapport à l'axe d'outil (112) de l'alésage de guidage (115) à une face externe du corps d'outil ; une pluralité de supports de moyen de coupe qui ont chacun une section de support (152) qui est large dans la direction circonférentielle et comprend une face externe pour recevoir un moyen de coupe, et ont une section d'ajustement (158) qui est plus étroite que la section de support et a une surface inclinée sur la face interne opposée à la face externe pour interagir avec une surface inclinée associée de l'un des deux éléments d'ajustement. Les sections d'ajustement des supports de moyen de coupe sont chacune radialement reçues de manière mobile dans l'une des ouvertures de guidage. Tous les supports de moyen de coupe qui peuvent être ajustés par l'intermédiaire du premier élément d'ajustement forment un premier groupe de coupe, et tous les supports de moyen de coupe qui peuvent être ajustés par l'intermédiaire du second élément d'ajustement forment un second groupe de coupe, le corps d'outil (110) ayant au moins quatorze ouvertures de guidage (160) qui ont une répartition angulaire irrégulière de telle sorte qu'au moins l'une des ouvertures de guidage a un espacement angulaire différent (WA) par rapport aux ouvertures de guidage directement adjacentes dans la direction circonférentielle.
PCT/EP2022/082268 2021-11-22 2022-11-17 Outil de pierrage et procédé de production d'un outil de pierrage WO2023089025A1 (fr)

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DE102021213090.9A DE102021213090A1 (de) 2021-11-22 2021-11-22 Honwerkzeug und Verfahren zur Herstellung eines Honwerkzeugs
DE102021213090.9 2021-11-22

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501690A1 (de) * 1974-05-10 1975-11-20 Ex Cell O Corp Honwerkzeug
DE102017202573A1 (de) 2017-02-17 2018-08-23 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Honwerkzeug und Feinbearbeitungsverfahren unter Verwendung des Honwerkzeugs
DE102019201465A1 (de) 2019-02-05 2020-08-06 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Honwerkzeug und Feinbearbeitungsverfahren unter Verwendung des Honwerkzeugs

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271586B (de) 1964-10-08 1968-06-27 Peter Nagel Honwerkzeug
DE2914157C2 (de) 1979-04-07 1983-09-15 Peter 7442 Neuffen Nagel Honwerkzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2501690A1 (de) * 1974-05-10 1975-11-20 Ex Cell O Corp Honwerkzeug
DE102017202573A1 (de) 2017-02-17 2018-08-23 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Honwerkzeug und Feinbearbeitungsverfahren unter Verwendung des Honwerkzeugs
WO2018149696A1 (fr) 2017-02-17 2018-08-23 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Outil de finissage et procédé d'usinage de précision reposant sur l'utilisation de l'outil de finissage
DE102019201465A1 (de) 2019-02-05 2020-08-06 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Honwerkzeug und Feinbearbeitungsverfahren unter Verwendung des Honwerkzeugs

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