EP2364813B1 - Honing tool - Google Patents

Description

The invention relates to a honing tool for machining cylindrical bores according to the preamble of claim 1 and to a honing stone usable for producing such a honing tool according to the preamble of claim 11.

Honing is a machining process with geometrically indeterminate cutting, in which a honing tool performs a two-component cutting movement and there is a continuous surface contact between one or more cutting material bodies of the honing tool and the bore inner surface to be machined. The kinematics of an expandable honing tool is characterized by a superposition of a rotational movement, a running in the axial direction of the bore lifting movement and a feed movement, which leads to a change in the effective diameter of the honing tool. At the bore inner surface results in a surface structure with intersecting machining marks. Finished by honing Surfaces can meet extremely high dimensional and dimensional tolerances requirements, so that many highly loaded sliding surfaces in engines or engine components, eg cylinder surfaces in engine blocks or inner bore surfaces in injection pump housings, are honed.

Particularly in the machining of holes with relatively small diameters, for example in the diameter range of 15 mm or less, honing tools are used, which have a tubular tool body which is fixed with one end portion in a tool shank and at the opposite end portion a cutting area with at least one of Inside the tool body have outwardly continuous Honteistenaufnahmeöffnung for receiving a honing stone. The tool body serves as a receptacle for one or more honing stones and at the same time as a guide for a Zustellstange, which serves the radial delivery of the honing stones. The tool shank serves, on the one hand, to receive the tool body and, on the other hand, to fasten the honing tool to the work spindle of a honing machine.

The dimensions of the generally rectangular Honleistenaufnah-, meöffnung and the corresponding cross-sectional dimensions of the honing stone are coordinated such that the honing stone is received radially movable and in the circumferential direction of the tool body substantially free of play between boundary surfaces of the honing stone receiving opening. As a rule, attempts are hereby made to realize a precise fit of the boundary surfaces of the honing stone receiving opening and the corresponding side surfaces of the honing stone a sliding seat, so that the honing stone can be used by hand just in the honing stone receiving opening and there by static friction forces between side surfaces of the honing stone and adjacent boundary surfaces the honing stone receiving opening is held.

The protruding into the interior of the tool body inside the honing stone usually has an inclined surface which cooperates with a corresponding inclined surface at the end of the feed rod in the manner of a wedge drive such that an axial displacement of the Zustellstange to the distal end of the tool body a radial displacement of the honing stone after outside causes. The DE 299 21 053 U1 shows examples of such honing tools.

Honing tools of this type are very reliable and guarantee best machining results. However, after a prolonged period of use, honing stone damage can occasionally be observed, which can be seen in part as one-sided wear of the cutting surface. In some cases, after prolonged use, it has also been observed that honing stones can get stuck in the honing stone opening. It may also happen that after a longer useful life of the honing tools honing stones fall out of the honing stone receiving opening when the honing tool is pulled out of the machined bore. In order to prevent falling out of honing tools, so-called inguinal traps are used in some cases. These are essentially sleeve-shaped components which are slidably guided on the tool body above the cutting area and, due to their own weight, slide over the cutting area with the honing stones when the honing tool is pulled out of the bore. As a result, the falling out of honing stones is prevented and any difficulties in introducing the honing tool in the next hole to be machined are avoided.

The utility model DE 296 16 300 shows a honing tool, which has a restraining device or a brake for inhibiting the movement of the honing stone in the radial feed, wherein the inhibiting device holds the honing stone in the respectively delivered position. This persists the honing stone without the action of the feed mechanism in the respectively reached position. In one embodiment, the tool shank in a wall of a slot-shaped honing stone receiving opening on a radially open and open to the outside of the tool shank recess, in which a brake element is inserted from an elastomeric material, which is frictionally engaged with honing stone with inserted honing stone.

The U.S. Patent 4,471,576 describes a honing tool for machining small diameter holes. The honing tool has a tubular tool body which is fixed with one end portion in a tool shank and at the opposite end portion has a cutting area with a rectangular honing stone receiving opening extending from the inside of the tool body to the outside. In this is a honing stones used. At the side of the honing stone opening facing away from the tool shank, a recess is drilled in the wall of the tool body into which a resilient rubber O-ring is inserted. The O-ring partly projects beyond the boundary surface facing the honing stone, so that the honing stone is held in the honing stone receiving opening by the O-ring which presses against the honing stone.

The U.S. Pat. No. 2,952,952 describes abrasive elements for honing tools. The abrasive material of the honing stone is surrounded by a preformed shell of wear-resistant, non-abrasive material into which the abrasive material is glued. The shell protects the abrasive material against breakage and the wall of the honing stone opening against wear by the abrasive material. In one embodiment, the shell has a rectangular shape. On a side wall V-shaped projections or ribs are provided, which extend with built honing stone in the radial direction of the honing tool. Support the projections At the associated boundary surface of the honing stone opening and thereby prevent falling out of the honing stone from the honing stone receiving opening.

The US Pat. No. 5,957,766 describes a honeycomb with a tool body having a removable outer shell on which the abrasive elements of the honing tool are mounted.

The Patent US 3,037,333 describes honing elements having a carrier element carrying an abrasive honing stone. At one axial end a bushing for receiving a retaining ball is recessed in a recess. The restraint ball is seated on an O-ring of resilient, compliant material attached to the bottom of the sleeve. In the fully assembled state, the retaining ball projects with a small portion beyond the axial end face of the support element. When inserting the honing stone into a honing stone receiving opening, the ball snaps behind corresponding protrusions on the opposite side of the honing stone receiving opening, so that the honing element as a whole loosely sits in the honing stone receiving opening without falling out.

TASK AND SOLUTION

It is an object of the invention to provide a generic honing tool that works reliably even after prolonged use and can have a longer service life than conventional honing tools of similar design. The improved functionality should be achievable with relatively simple design measures.

To solve these and other objects, the invention provides a honing tool with the features of claim 1 and a honing stone with the features of claim 11 ready. Advantageous developments are specified in the dependent claims. The wording of all claims is incorporated herein by reference.

A honing tool according to the invention is characterized by an effective between the honing stone and the Honleistenaufnahmeöffnung clearance compensation device with at least one support element which is supported in the installed state of the honing stone on the one hand on a side surface of the honing stone and on the other hand on a side surface opposite boundary surface of the honing stone receiving opening with a pressing force. For this purpose, the honing stone has a recess in at least one side surface on a guide surface provided for cooperation of the honing stone receiving opening and an elastically deformable support element is arranged in the recess which projects beyond the side surface of the honing stone in the unloaded, ie non-deformed state and which is installed Condition of the honing stone partially deformed and supported on the side surface opposite the boundary surface of the honing stone receiving opening with a pressing force.

In this embodiment, all required for the provision of the play compensation device structural changes over conventional honing tools on the honing stone can be realized. This makes it possible to provide novel honing stones, can be produced by their installation in conventional tool body honing tools with improved properties. Such honing stones can be used not only in the new production of honing tools, but also when retrofitting conventional honing tools. Honing strips of this type can also be used in the maintenance and repair of already used hone tools of the generic type.

Detailed investigations have shown that hitherto unobserved wear mechanisms can occur on honing tools, which limit the service life of the honing tools. In the new manufacture of the tools is ensured that a clear distance between facing boundary surfaces of the honing stone receiving opening and a measured between corresponding side surfaces of the honing stones the width of the honing stone are coordinated such that the generally planar and parallel to each other lateral boundary surfaces of the honing stone receiving opening and the side faces, which are also generally flat, facing them form the honing stone sliding partners, which allow a radial displacement of the honing stone within the honing stone receiving opening at the delivery, on the other hand, however, the stiction should be sufficiently large so that a once inserted honing stone no longer falls out of the honing stone receiving opening. During use of the honing tool, however, wear on the cooperating sliding surfaces can occur, which occur due to movement of the honing stone within the honing stone receiving opening during honing. For example, honing sludge, ie a mixture of cooling lubricant and the finest abrasive particles of the honing process, can settle in the gaps and lead to increased abrasive wear. Where this wear mechanism acts, the honing stone may become somewhat narrower and / or the honing stone receiving aperture may become slightly wider so that the clearance between these elements increases over the duration of tool use. During the rotational movement of the honing tool, this can lead to slight tilting of the honing stones from the desired radially aligned nominal position, which in turn can lead to unilateral wear of the cutting pad and possibly not optimal machining results on the bore inner wall. The loss of the relatively firm fit of the honing stone in the honing stone receiving opening can eventually lead to the honing stone falling out of a bore when moving out of the honing tool, if no countermeasures are taken.

By the play compensation device such problems are eliminated, since the possibly in the course of use magnifying game between honing stone and honing stone receiving opening is pushed at any time on the support member from the fit, so that evolving tolerances are bridged. The elastically deformable support element is biased in a slightly deformed state, so that even when increasing a distance between Honing side surface and boundary surface gives a reliable two-sided support and the honing stone is reliably held in the honing stone receiving opening. By the play compensation device, the range of motion of the honing stone in the Honleistenöff voltage is limited so far that at least a portion of the previously effective wear mechanisms can not act or only in a greatly mitigated form. As a result, on the one hand, the wear on the honing tool is reduced and, on the other hand, the potential consequences of wear-related changes in the geometries are compensated so that the problems associated therewith no longer occur or only in a greatly attenuated form.

In some embodiments, the support member is an element that is at least partially, but preferably entirely made of an elastically compressible material, in particular an elastomeric material or a rubber material. As the elastomer is here called a dimensionally stable, but elastically deformable plastic, as used for example for sealing elements different construction. Rubber materials can be made on the basis of vulcanized rubber. Support elements made of elastically compressible materials are inexpensive to manufacture, available in many useful dimensions and cross-sectional shapes and usually permanently resistant to all occurring during honing coolants and lubricants under normal processing conditions.

Alternatively or additionally, at least one support element may be a spring element which, inter alia for reasons of durability, may preferably consist of a metallic material, for example a suitable spring steel. The spring element can be configured for example in the form of a leaf spring.

In some embodiments, the recess is a groove, i. an elongated recess in a side surface of the honing stone and the support member is an elongate member which extends over at least a portion of the length of the groove, in particular over the entire length of the groove. Elongated recesses in the form of grooves can be produced very easily and with any suitable cross-sectional shape by milling or grinding on a honing stone. It is also possible to provide a recess for an elastically deformable support element equal to the production of the honing stone, so that a material-removing machining step can be saved. For example, a recess can be produced during sintering of a sintered honing stone body in that the corresponding molding tool has a corresponding strip-shaped projection at the desired location of the recess.

As elongated elastic support members, portions of conventional weather strips or other sealing members may be used. Due to the elongated configuration of the recess and the support element, support along a linear support region is possible, as a result of which the inclination of the honing stone for tilting can be reduced. In a groove, a plurality of support elements or support element segments may be included. Preferably, only a single support element is received in a groove, which can extend over the entire length of the groove.

It is particularly favorable when the groove extends over the entire length of the side surface and when the support element is an elongate member made of an elastically compressible material and also extends over the entire length of the side surface. In particular, the groove and the support element received therein can run parallel to the axial direction of the honing tool or perpendicular to the radial feed direction of the honing stone. In this way, the lash adjuster simultaneously act as a sealing device, for example, prevents the penetration of honing sludge or coolant from the outside into the interior of the tool body over the entire width or length of the compressed support member.

In some embodiments, the elongated support member in the undeformed state has a round cross-sectional shape, in particular a circular or elliptical cross-sectional shape. Such elements are durable even under harsh environmental conditions and, with appropriate oversizing of the recess in this possibly limited and reolling, whereby the radial mobility of the honing stone can be supported. It is also possible that the support element in the undeformed state has a polygonal cross-sectional shape, in particular a rectangular shape or a triangular shape. Other cross-sectional profiles of elastic support elements are possible.

Preferably, the groove has a rounded groove shape, i. a cross-sectional shape without corners. The inside width of the groove can decrease continuously with increasing depth, so that it can be a groove open to the side surface without an undercut. In such shaped grooves supporting elements with a round cross-sectional shape and some undersize relative to the larger groove may optionally roll limited to ensure the radial mobility of the honing stone.

In general, it is advantageous if a play compensation device is provided only at one of two perpendicular to the direction of rotation of the honing tool side surfaces of the honing stone. On a corresponding honing stone, this is normally recognizable by the fact that only at one of two parallel longer side surfaces of the honing stone a recess is attached. Preferably, these are the lateral surface of the honing stone leading in the direction of rotation of the honing tool. A one-sided clearance compensation device is on the one hand in the production cheaper than a bilateral clearance compensation device. In addition, it is ensured by a one-sided clearance compensation device that exists on the opposite side surface direct contact contact between the hard boundary surface of the honing stone receiving opening and the likewise hard side surface of the honing stone, so that the position of the honing stone is defined relative to the honing stone receiving opening. As a result, the danger of tilting of the honing stone within the honing stone receiving opening can be counteracted, especially as, upon rotation of the honing tool, the force resulting from the processing acts as a contact force on these surfaces.

When using elastically compressible materials for support elements, even more favorable effect may result. On the one hand, the elasticity or compressibility of the material between the side surface of the honing stone and the opposite boundary surface acts in the sense of backlash compensation to prevent relative movement in the direction perpendicular to the sliding surfaces largely. On the other hand, when the honing stones are fed radially, there is a relative displacement between honing stone and honing stone opening in the radial direction, so that the rubber-elastic material clamped therebetween is subjected to transverse forces which entangle or walk the material. As a result, elastic restoring forces can arise, which want to achieve a return movement or catching movement of the honing stones against the force of acting from the inside delivery. If the Zustellstange withdrawn to relieve the honing stones, so the elastically deformed support member can serve as Honteisten-pulling-in device for pulling the honing stone when retracting the Zustellstange or another Zustellinrichtung. As a rule, return paths in the order of a few micrometers are sufficient to facilitate the removal of the honing tool from the machined bore and to avoid damage to the honing stone and / or bore inside surface. Corresponding advantages may also arise during insertion of the tool into a new bore.

The invention thus also provides a generic honing tool, which is characterized by a honing stone intake device for drawing in the honing stone when retracting the delivery device. In contrast to the conventional groin-catching bushes, which push back the honing stones from the outside into the honing stone opening, an inwardly acting retraction force becomes effective here. It is therefore possible to dispense with groin-trap bushings.

These and other features will become apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combinations in one embodiment of the invention and in other fields be realized and advantageous and protectable Can represent versions. Embodiments of the invention are illustrated in the drawings and are explained in more detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

shows a parallel to the axis of rotation of the honing tool extending section through an embodiment of a honing tool;

Fig. 2

shows a side elevational view of a tubular tool body with rectangular honing stone receiving opening;

Fig. 3

shows a guided perpendicular to the tool axis section through the provided with a honing stone cutting area of the honing tool Fig. 1 ;

Fig. 4

shows a schematic detail of a lash adjuster in another embodiment;

Fig. 5

shows a schematic detail view of a lash adjuster with a leaf spring element which is mounted in a recess of the honing stone,

Fig. 6

shows a schematic detail of a lash adjuster in another embodiment;

Fig. 7

shows a schematic detail of a lash adjuster with a tubular support member; and

Fig. 8

shows a schematic detail of a lash adjuster with a support member which completely fills a recess of the honing stone.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In Fig. 1 is a longitudinal section through an embodiment of a designed as Einleisten honing tool honing tool 100 parallel to the not visible in the sectional view tool axis (rotation axis) of the honing tool shown. The honing tool has a tool body 110 in the form of a tube open on both sides with a relatively large wall thickness, which is more than 20% of the outer diameter of the Tube is. An end portion of the tool body made of a steel material is rotatably inserted into a cylindrical receiving opening of a tool shank 120 and fixed there by means of a retaining screw 122. The tool shank 120 serves to couple the honing tool to a honing spindle of a machine tool. Tool shank and tool body can be connected to each other in a detachable or non-detachable manner, for example by clamping (see DE 299 21 053 U1 ), by soldering o.

In a tool end opposite the tool free end portion of the tool body is the cutting area of the honing tool, which is introduced for honing in the interior of a machined bore. How very good in Fig. 2 can be seen, the tool body in the cutting area has a from the inside of the tool body outwardly continuous, rectangular honing stone receiving opening 140, in the assembled honing tool (see Fig. 1 or 3 ) a honing stone 150 is recorded accurately. The honing stone receiving opening has four pairs of parallel, planar boundary surfaces, namely a (in the axial direction) upper boundary surface 141, a parallel thereto lower boundary surface 142 and two perpendicular to these shorter boundary surfaces extending, longer lateral boundary surfaces 143 and 144, of which in the direction of rotation 115th leading boundary surface is referred to as a front boundary surface 143 and trailing in the direction of rotation boundary surface as the rear boundary surface 144. The front and the rear boundary surface are each flat and parallel to a plane which is spanned by the tool axis 112 and a centrally extending between the lateral boundary surfaces radial direction 113.

At the side opposite the honing stone receiving opening 140, two mutually offset by approximately 90 ° on the tool body Support strips 180, 181 mounted with radial outer surfaces of hard metal or other hard, such as ceramic material.

The overall plate-shaped honing stone 150 has a plate-shaped support member 151 made of steel, on the radial outer side of a cutting pad 152 is applied, which holds the bound in a bond Schneidstoffkörner. The covering is sintered on the carrier in the example, but can also be glued or soldered in other embodiments or attached by rivets or screws on the support element. A honing stone may also be formed by a one-piece sintered body. A radial inner side of the carrier element has a flat oblique surface, which interacts with a complementary planar oblique surface at the lower end of a guided in the tool body feed rod 130 in the manner of a wedge drive, that the honing stone is pressed radially outward within the honing stone receiving opening when the Zustellstange by the in the honing machine accommodated feed drive is pressed in the direction of the cutting area of the honing tool. Soche honing stones are sometimes referred to as "honing stone with expansion profile".

The portion of the honing stone, which lies in the installed state between the lateral boundary surfaces 143, 144 of the honing stone receiving opening and which is guided during the radial movement through these surfaces, is referred to as guide section 155. The guide portion includes a portion of the support member 151 and a smaller portion of the cutting pad. The dimensions of the honing stone and the honing stone receiving opening are matched to one another in such a way that the honing stone is accommodated radially movably in the circumferential direction of the tool body substantially without clearance between the lateral boundary surfaces 143, 144. In the axial direction, ie between the upper and lower boundary surfaces may be present a small game. In general, however, one tries, even in the axial direction one To achieve as play-free seat. During production, care is taken that the clear distance between the front and rear boundary surfaces 143, 144 of the honing stone receiving opening is only minimally greater than the width of the honing stone measured between the front side surface 153 and the rear side surface 154 of the honing stone. In the most favorable case, a relatively fixed sliding seat should result, so that the honing stone can be manually pushed into the honing stone receiving opening from the outside during assembly, but it can not fall out of the honing stone receiving opening on its own. However, the honing stone should be able to be moved radially outwards under the action of the downwardly pressed infeed rod.

A peculiarity of the honing tool is that a play compensation device 160 is provided between the honing stone 150 and the honing stone receiving opening 140, which is constructed so that a possible clearance between the honing stone receiving opening and the honing stone received therein is permanently compensated even if the above described geometric conditions (sliding seat) due to wear or other causes should change. In the embodiment, this is structurally very simple, but solved very effectively. The honing stone has an elongated recess 162 in the form of a groove in the guide section in the immediate vicinity below the cutting surface, which extends over the entire length of the front side surface 153, parallel to the tool axis and thus also to the cutting surface. The groove 162 has a rounded, approximately semicircular cross-sectional shape. The groove width is less than 50%, in particular less than 40% or less than 30% of the radial width of the guide section, so that the groove in the entire radial adjustment of the honing stone is always completely opposite to the opposite front boundary surface 143.

In the groove 162 is an elastically deformable support member 165, which is a cross-sectionally round, elongate member made of an elastomeric material. The support member may be formed, for example, by a portion of an O-ring or similar conventional sealing element. The diameter of the support member is about twice the depth of the groove 162 provided for receiving it, so that about half of the support member projects beyond the front side surface 153 when the support member is completely inserted into the groove and optionally there by gluing or on others Way is attached. The elastically compressible support member fills the groove 162 along its entire length, so that the parallel to the tool axis gap, which may be formed between the front side surface 153 of the honing stone and the opposite front boundary surface 143 of the honing stone receiving opening, largely by the compressible material in the radial direction is sealed when the honing stones is inserted into the honing stone receiving opening.

During assembly, the support element 165 is first inserted into the groove 162 and optionally fixed there by gluing or the like. Then the honing stone is pressed from the outside into the honing stone receiving opening. The support element is strongly compressed as soon as the groove reaches the area of the honing stone receiving opening. Upon insertion, the support member is compressed and fills the groove 162 and the gap between the grooved side surface 153 and the front boundary surface 143 from. The elastic forces within the support element ensure that the honing stone is pressed with its rear side surface 154 firmly against the rear boundary surface 144, so that there is no playful gap between the sliding partners of the sliding pair there. If a gap arises, so this is the case between the corresponding surfaces 143, 153 of the front pair, which may be due to the Support element are pressed apart. Nevertheless, the honing stone remains due to the pressure-loaded system of the rear end surfaces 154, 144 reliably in their radial orientation and can not tilt. This pressing force F (see arrow) is further enhanced when the honing tool rotates during machining in the bore in the direction of rotation 115 and the cutting pressure additionally presses the honing blade against the rear boundary surface 154.

The play compensation device 160 is mounted only on one side of the honing stone, namely on that side which leads in rotation direction 115 upon rotation of the honing tool. This ensures that two hard, flat surfaces 144, 154 rest on the opposite sliding pair, so that the honing stone always has a defined position position during processing. A tilting of the honing stone is thereby reliably avoided. The avoidance of a Honleistenverkippung in turn means that the Honleiste remains optimally aligned radially even during processing and thus the cutting surface is processed evenly. This results in noticeable increases in the service life of the tools. The lash adjuster further secures the honing stone from falling out of the tool body so that separate retention means, such as e.g. a groin box, are not necessary.

If the honing stone is delivered to the outside in the radial direction during machining by means of the feed rod, then the elastomer material running perpendicular to the radial feed direction is deformed by the advancing movement and a structure of the elastomeric material distorted by transverse deformation results. If, after completion of the honing process, the feed rod is withdrawn, the elastic return forces within the support element can bring about a restoring force on the honing stone, by which the honing stone is retracted radially inwards. The Rückholweg is usually only a few microns, for example between two microns and thirty microns. However, this is sufficient to cancel the contact pressure between the cutting surface and the bore inner surface so far that the honing tool can be safely pulled out of the workpiece without damaging the honed inner surface. Therefore, the elastically deformable support member here has a dual function, since it also acts as a restoring element of a honing stone catcher for pulling the honing stone when retracting the Zustellstange.

Some of numerous variants are in the 4 to 6 shown schematically. Fig. 4 shows an enlarged section of a honing tool with a lash adjuster 460, which has a running in the longitudinal direction of the honing stone 450 below the cutting pad 452 groove 462 in which a continuous, long, elastically compressible support member 465 is located. This has a circular cross-section in the unloaded state and can be formed, for example, by a section of an O-ring of suitable dimension. In contrast to the embodiment of Fig. 3 the groove 462 has a wider and shallower appearing cross-section, which results from the fact that the radius of curvature of the groove cross-section is substantially larger than the radius of curvature of the support element cross-section. This makes it possible that the parallel to the axial direction elongated support member 465 within the relatively wide groove 462 in the radial direction of the honing stone rolls when the honing stone is advanced by the feed device from the inside radially outward. The compressed support element then gets into the increasingly narrowing region of the groove edge on the side facing away from the cutting surface. During the rolling movement, an increasing compression of the support element takes place. If the feed rod is subsequently withdrawn, the support element can relieve pressure or relax by attempting to move into the infeed Fig. 4 Roll back the equilibrium position shown. As a result, a radially inwardly directed restoring force is exerted on the honing stone.

In the embodiment of Fig. 5 is in the front side surface 553 of the honing stone 550 a rectangular recess 562 introduced, which can pass over the entire length of the honing stone, but can also take only a portion of the length. In the upper surface of the recess 662 facing the cutting pad 552, one end of a thin-plate spring 565 made of spring steel is fixed by spot welding or otherwise. The leaf spring is curved convexly relative to the bottom of the recess 562 and is supported with its free end on the flat bottom of the recess 162. The leaf spring is dimensioned so that the curved central portion of the leaf spring in the unloaded, undeformed state, the side surface 553 so far surpasses that the leaf spring slightly deformed when inserting the honing stone in the honing stone opening by the abutting contact with the front boundary surface 543 of the honing stone receiving opening and thereby the honing stones and the opposite boundary surface 543 of the honing stone opening apart such that any existing game is compensated.

In the embodiment of Fig. 6 the supporting element 665 made of an elastomeric material has a rectangular cross-section, in particular a square cross-section and fits snugly into a rectangular groove 662 of the honing stone 650. The support element lies with a frontally flat interface at the opposite flat boundary surface 643 large area and seals this area reliably , If an elastic deformation of the support element has built up after radial displacement of the honing stone to the outside, so the restoring forces that lead to retrieve the honing stone after relieving the Zustellsystems, in this embodiment, particularly strong.

In the embodiment of Fig. 7 has the support member 765 made of a rubber-elastic material a roundish cross-section and is precisely in a rectangular groove 762 of the honing stone 750. The diameter of the support member is slightly larger than the depth of the rectangular groove. The support member is a tubular hollow body in the form of a compressible tube with a tube wall made of an elastic material. For example, a silicone hose can be used. The wall thickness is typically between 10% and 40% of the diameter in the uncompressed state. The forces required for the deformation of the hollow body are less than with solid support elements, the support element adapts particularly well to the shape of the gap between the honing stone and the inside of the honing stone receiving opening in the tool body.

In the embodiment of Fig. 8 fills the consisting of a rubber elastic material support member 865 the substantially semi-circular cross-section of a receiving groove 862 of the honing stone 850 completely and protrudes slightly beyond the edge of the receiving out. The support element is produced by the receiving groove on the honing stone is sprayed with a flowable silicone compound so that a portion of the silicone mass protrudes beyond the edge of the receiving groove. Thereafter, if necessary, a portion of the over the edge of the receiving protruding silicone mass to a defined supernatant height by wiping or otherwise removed before the mass solidifies. It is also possible to carry out the removal after solidification of the silicone composition by cutting or grinding. If the correct amount is filled in during filling, a subsequent removal can be dispensed with. Such support elements are relatively inexpensive to manufacture and sit particularly firmly in the associated recess. They can be particularly advantageous in small-sized honing tools, where separate support elements with sufficient small dimensions may be difficult to produce or procure.

The embodiments of the FIGS. 7 and 8 are particularly suitable for honing tools with a very small diameter, eg for diameters from 2 mm to 10 mm.

Embodiments of the invention have been explained with reference to Einleisten honing tools, so honing tools with only a single honing stone. A honing tool may also have more than one honing stone, for example, two or three or four honing stones, the honing stones may be evenly or non-uniformly distributed around the circumference of the honing tool. Instead of a single support element, a play compensation device or a honing stone catchment device may also have more than one elastically deformable support element, for example three, four, five or six or more.

A major advantage of the embodiments described is that the elements of the play compensation device or the honing stone catcher can be provided in very small dimensions. Preferred embodiments of honing tools are intended for machining relatively small bores and have, for example, an effective diameter of 20 mm or less or even 15 mm or less, in particular 10 mm or less. Typically, the effective diameter may be between about 5 mm and about 10 mm. However, it is not excluded to use the concepts presented here for honing tools with larger diameters up to 35 m or beyond.

Claims (12)

1. Honing tool having a tubular tool body (110) which is fastened with an end section in a tool shank (120) and has on the opposite end section a cutting region with at least one honing-stick accommodating opening (140) which is continuous from the interior of the tool body to the outside and is intended for accommodating a honing stick (150), the dimensions of the honing-stick accommodating opening and of the honing stick being matched to one another in such a way that the honing stick is accommodated in a radially movable manner, and essentially free of play in the circumferential direction of the tool body, between boundary surfaces of the honing-stick accommodating opening, a play-compensating device (160) which is effective between the honing stick and the honing-stick accommodating opening and has at least one elastically deformable supporting element (165) being provided, which is supported with a pressure force, in the fitted state of the honing stick, on the one hand on a side surface (153) of the honing stick (150) and on the other hand on a boundary surface (143), opposite the side surface, of the honing-stick accommodating opening,
   characterized in that the honing stick has a recess (162) on a side surface (153) in a guide section (155) intended for interaction with the honing-stick accommodating opening (140), and arranged in the recess is an elastically deformable supporting element (165) which projects beyond the side surface (153) of the honing stick in the relieved state and which, in the fitted state of the honing stick, is partly deformed and is supported with a pressure force on a boundary surface (143), opposite the side surface, of the honing-stick accommodating opening.
2. Honing tool according to claim 1, wherein the supporting element (165) is made at least partly, preferably completely, of an elastically compressible material, in particular an elastomer material or a rubber material.
3. Honing tool according to any of the preceding claims, wherein the recess is a groove (162) in a side surface (153) of the honing stick (150) and the supporting element (165) is an elongated element which extends over at least part of the length of the groove, in particular over the entire length of the groove.
4. Honing tool according to claim 3, wherein the groove (162) has a rounded groove shape, the clear width of the groove preferably decreasing continuously with increasing depth.
5. Honing tool according to any of claims 3 or 4, wherein the elongated supporting element (165) has a round cross-sectional shape, in particular a circular or elliptical cross-sectional shape, in the non-deformed state.
6. Honing tool according to any of the preceding claims, wherein the recess (162) extends over the entire length of the side surface (153) of the honing stick, preferably in parallel to an axial direction of the honing tool, and the supporting element (165) is an elongated element made of an elastically compressible material and likewise extends over the entire length of the side surface.
7. Honing tool according to any of the preceding claims, wherein a play-compensating device (160) is provided only on one of two side surfaces of the honing stick, running perpendicularly to the rotation direction (115) of the honing tool, preferably on that side surface (153) of the honing stick which leads in the rotation direction of the honing tool.
8. Honing tool according to any of the preceding claims, characterized by a honing-stick draw-in device for drawing in the honing stick (150) during retraction of an infeed device.
9. Honing tool according to any of the preceding claims, wherein the supporting element (865) fills the recess completely, wherein the supporting element is preferably produced in that the recess is filled up with a silicone material capable of flowing and solidifying, said material partially projecting beyond a rim of the recess.
10. Honing tool according to any of the preceding claims, wherein the supporting element is a hollow body made of a rubber-elastic material, preferably a silicone hose (765).
11. Honing stick, in particular for use in a honing tool according to any of the preceding claims, characterized in that the honing stick has a recess (162) on a side surface (153) in a guide section intended for interaction with a honing-stick accommodating opening (140) of the tool body of the honing tool, and arranged in the recess is an elastically deformable supporting element (165) which projects beyond the side surface (153) of the honing stick in the relieved state and which is dimensioned in such a way that, in the fitted state of the honing stick, it is partly deformed and is supported with a pressure force on a boundary surface (143), opposite the side surface, of the honing-stick accommodating opening.
12. Honing stick according to claim 11, characterized by the features of the characterizing part of any of claims 3, 5 to 7, or 9 to 10.

Images