Honing tool with honing strip resetting system

Abstract

The invention relates to a honing tool. 2.1 The invention relates to a honing tool having a tool body which is tubular at least in sections and which comprises a cutting region with at least one honing stone receiving opening which runs through from the inside of the tool body to the outside and which serves to receive an individual honing stone. The dimensions of the honing bar receiving opening and the honing bar are coordinated with each other in the circumferential direction and preferably also in the axial direction such that the honing bar is radially movable and is received between the boundary surfaces of the honing bar receiving opening substantially without play in the circumferential direction of the tool body. By means of the radial mobility, the honing stone can be fed in the radial direction by means of the feeding element which is guided in an axially movable manner inside the tool body via the co-acting inclined surface during the axial movement of the feeding element. The invention relates to a honing tool having a honing stone resetting system, which comprises at least one elastic resetting element. In the installed state of the honing bar, the honing bar resetting system acts on the honing bar in such a way that a radial force acts from the outside to the inside and presses the honing bar against the feed element. 2.2 According to the invention, the elastic restoring element is C-shaped and partially surrounds the outer side of the tool body. 2.3 for example as a honing tool for surface treatment.

Description

Technical Field

[0001] The invention relates to a honing tool (or honing tool, Honwerkzeug) according to the preamble of claim 1 and a honing stick according to the preamble of claim 10, which can be used to produce such a honing tool. Background Art

[0002] Honing is a cutting method with a geometrically indeterminate cutting edge (or cutting, i.e. Schneiden), in which the honing tool performs a two-part cutting motion in the hole to be processed, and there is a continuous surface contact between one or more cutting material bodies of the honing tool and the inner surface of the hole to be processed. The kinematic characteristics of the expandable honing tool are the superposition of a rotational motion, a reciprocating motion extending in the axial direction of the hole, which is usually oscillating, and a feed motion, which causes the effective diameter of the honing tool to change. A surface structure with intersecting machining marks is obtained on the inner surface of the hole. The surface finally processed by honing can meet the high requirements regarding dimensional tolerances and shape tolerances, so that many highly loaded sliding surfaces in engines or engine components, such as the cylinder running surfaces in the engine block or the inner surface of the hole in the housing of the injection pump, are processed by honing.

[0003] In particular, when machining holes with relatively small diameters, for example holes in the diameter range of 15 mm or less, a honing tool is used which has a tool body which is tubular at least in sections and has a cutting region with at least one honing-stick receiving opening which passes through from the interior of the tool body to the outside and is used to receive a honing stick. The tool body serves here as a receptacle for one or more honing sticks and also as a guide for a feed element which is used for radial feeding of the honing sticks. The honing tool comprises means for detachably fastening the honing tool to a working spindle of a honing machine.

[0004] The dimensions of the usually rectangular honing-stick receiving opening and the corresponding cross-sectional dimensions of the honing stick are matched to one another in such a way that the honing stick can be moved radially and is received substantially without play between the boundary surfaces of the honing-stick receiving opening in the circumferential direction of the tool body. In this context, attempts are usually made to achieve a sliding fit by precisely machining the boundary surfaces of the honing-stick receiving opening and the corresponding side surfaces of the honing stick, so that the honing stick can still be inserted into the honing-stick receiving opening by hand and is held there by the static friction forces between the side surfaces of the honing stick and the adjacent boundary surfaces of the honing-stick receiving opening.

[0005] The inner side of the honing stick protruding into the interior of the tool body usually has a bevel which interacts with a corresponding bevel on the feed element in the manner of a wedge drive such that an axial displacement of the feed element toward the end of the tool body facing away from the spindle causes a radial displacement of the honing stick outward.

[0006] In the case of honing tools, the resetting of the honing sticks is also important. The resetting of the honing sticks is the radial displacement of the honing sticks inwards during the axial displacement of the feed element towards the end of the tool body that is close to the spindle. This facilitates the removal of the honing tool from the machined bore and also avoids damage to the honing sticks and / or the inner surface of the bore. Corresponding advantages can also be achieved when the honing tool is introduced into a new bore. In order to enable the resetting of the honing sticks, various honing stick resetting systems have been developed.

[0007] Honing stick restoring systems with so-called restoring springs are known. These restoring springs are usually designed as annular closed spiral springs or helical tension springs. Two restoring springs are usually provided, which are inserted into annular grooves machined into the tool body in the region of the axial ends of the honing stick and grip the axial ends of the honing stick. The restoring springs are intended to ensure that the honing stick is displaced back into the tool body at the end of the machining process when the feed cone is retracted.

[0008] In the case of honing tools with smaller diameters, elastic O-rings are sometimes also used as return elements instead of return springs. Summary of the invention

[0009] The object of the present invention is to provide a honing tool of the generic type which has a reliably functioning honing-stick resetting system which can be produced with relatively simple structural design measures and which is distinguished by simple handling during production and use.

[0010] To achieve this object, the invention provides a honing tool having the features of claim 1 and a honing stone having the features of claim 10. Advantageous developments are given in the dependent claims. The wording of all claims is incorporated by reference into the description.

[0011] The honing tool according to the claimed invention has a tool body which is tubular at least in sections and comprises a cutting region with at least one honing-stick receiving opening which passes through from the interior of the tool body to the outside and is used to receive a single honing stick. The dimensions of the honing-stick receiving opening and the honing stick are matched to one another in the circumferential direction and preferably also in the axial direction so that the honing stick is radially movable and is received between the boundary surfaces of the honing-stick receiving opening in the circumferential direction of the tool body essentially without play. The radial movability makes it possible for the honing stick to be fed in the radial direction by means of a feed element which is guided axially movably in the interior of the tool body via cooperating inclined surfaces during an axial displacement of the feed element. The honing tool has a honing-stick resetting system which comprises at least one elastic resetting element. The elastic resetting element acts on the honing stick in the installed state so that a radial force acts from the outside to the inside and presses the honing stick in the direction of the feed element.

[0012] The honing tool according to the claimed invention is characterized in that the elastic reset element is constructed in a C-shape and partially surrounds the outer side of the tool body in the circumferential direction. "Partially" here means in particular that the reset element does not completely surround the outer side of the tool body, but leaves a certain circumferential section. The elastic reset element can be placed on the outer side of the tool body under elastic deformation. Through the partially open C-shaped appearance, it is especially achieved that the elastic reset element can be easily assembled on the tool body. In the installed state, the reset element can be automatically retained on the tool body by its elasticity. In addition, the removal of the elastic reset element, especially when replacing the honing stick, can also be easily achieved. The reset element can be plugged into the tool body from the side for assembly, and the reset element can also be pulled down from the side for removal. The so-called "lateral" is here especially understood as a direction transverse to the tool axis.

[0013] In particular, no tools are required for assembly and, if applicable, also for disassembly. Pliers, screwdrivers or the like can advantageously be used for simple, comfortable disassembly of the resetting element. The handling is simple, since the fitter can hold the honing tool in one hand and the resetting element with the other hand and plug it in or pull it off.

[0014] In a refinement of the present invention, the C-shaped elastic reset element has an opening angle greater than 90° and less than 180° in the relaxed state. The opening angle here refers to the angle between the free ends of the C shape measured in the circumferential direction. This is a structurally and functionally advantageous implementation scheme for the honing stick reset system. When the opening angle is within this range, on the one hand, since the C shape is open on at least one quarter of its circumference, the elastic reset element can be easily assembled and disassembled; on the other hand, since the reset element grips the workpiece body over more than half of its circumference, the reset element is safely and reliably held or placed on the tool body. The elastic reset element can be placed on the tool body under elastic deformation by lateral "clamping". In the placed state, the reset element is automatically held on the tool body in a loss-proof manner. The so-called "loss-proof" here especially means that the reset element cannot be detached or fall off from the tool body by itself, for example under the action of gravity.

[0015] In the assembled state, the elastic restoring element preferably surrounds the outer side of the tool body by more than 180° and less than 270°, in particular by approximately 225°. This is a structurally and functionally advantageous implementation of the honing stick restoring system. In this embodiment, the elastic restoring element can be easily assembled and disassembled on the one hand and is securely and reliably held or attached to the tool body on the other hand.

[0016] In a refinement of the invention, the elastic restoring element is a wire bending part, which is preferably composed of spring steel. The wire bending part can be produced quickly and cost-effectively and with precisely maintained dimensions. Spring steel is very elastic and has, in particular, a tensile strength and a high elongation at break suitable for the application. Therefore, a large elastic restoring force can be generated during elastic deformation. The elastic restoring element is designed so that it can be bent up to the elastic limit and can return to the original shape after relaxation without permanent deformation. Alternatively, the restoring element can also be manufactured, for example, as a stamped part.

[0017] In an alternative embodiment, the elastic restoring element is made of an elastomeric material. Here, the elastomeric material can have material properties similar to spring steel.

[0018] The C-shaped restoring element can essentially have an outer shape in the form of a circular arc or an elliptical arc, with a uniform or only slightly varying curvature course up to the end.

[0019] In a further development of the invention, the end section of the elastic restoring element facing the honing stick is bent, wherein the elastic restoring element is connectable to the honing stick via the bent end section. Here, "connectable" means in particular that the restoring element can act on the honing stick to transmit force and can be detachably mounted on the honing stick. In this embodiment, the other end section of the elastic restoring element facing away from the bent end section surrounds the tool body and at least partially rests on the tool body.

[0020] Preferably, the end section of the elastic restoring element facing the honing stick is bent radially inwards. The end section of the elastic restoring element facing the honing stick is then located in the plane defined by the C-shape. In an alternative embodiment, the end section of the restoring element facing the honing stick is bent, for example, in the axial direction. This means that the bent end section protrudes from the plane defined by the C-shape, in particular substantially perpendicularly to the plane. In this case, the bent end section of the restoring element extends parallel to the tool axis.

[0021] In a further development of the invention, the honing stick comprises a carrier strip and a cutting coating applied to the radial outer side of the carrier strip. The cutting coating can be sintered or welded to the carrier strip, for example. The radial outer side of the carrier strip is opposite the inclined surface of the carrier strip. In this embodiment, the elastic reset element can be connectable to the carrier strip. Thus, the reset element can act in a section where no cutting coating is provided. Here, "connectable" also means, in particular, that the reset element is detachably arranged on the carrier strip. This is a structurally and functionally advantageous implementation of the honing stick reset system.

[0022] In a development of the invention, the honing stick has a recess on the outside, into which one end of the elastic restoring element can be hooked. The recess is preferably a radial hole, in particular a blind hole, which is introduced into the honing stick in such a way that it points in the direction of the tool axis when the honing stick is installed. The recess can provide a locally defined position for force-transmitting contact with the restoring element and also serves as a latching recess into which one end of the restoring element can be latched during assembly.

[0023] In an alternative embodiment, the hole on the outer side of the honing stick does not extend in the radial direction, for example the hole can extend through the honing stick in the circumferential direction of the tool body.

[0024] In a further development of the invention, the elastic restoring element has an inner diameter which, in the relaxed state, is smaller than an outer diameter of an outer side of the tool body against which the elastic restoring element at least partially abuts. The inner diameter of the elastic restoring element describes the diameter measured from the inside to the inside, wherein the inside faces the tool body in the installed state of the restoring element. The outer diameter of the outer side of the tool body corresponds to the diameter measured from the outside to the outside. If the elastic restoring element is placed on a honing stick inserted into a honing stick receiving opening of the tool body and on the tool body, a certain force already acts on the honing stick in the reset state or initial state of the honing stick due to the prestressing or deformation of the elastic restoring element. This force has a radial component which acts from the outside to the inside and presses the honing stick against the feed element. This is a structurally and functionally advantageous implementation of a honing stick restoring system.

[0025] In some embodiments, the outside of the mold body has an annular groove or annular groove for receiving the elastic return element in the circumferential direction. If this is the case, the inner diameter of the elastic return element is smaller than the outer diameter of the tool body measured at the groove bottom in the relaxed state.

[0026] In a further development of the invention, the honing tool has at least one fluid supply channel in the tubular tool body, which is used to supply coolant and / or lubricant into the cutting area. Here, the fluid supply channel opens into a hollow space in which the honing stick and the feed element are also located. The internal coolant supply is particularly advantageous in the case of long holes, since the coolant can be brought to the cutting area in a very targeted manner for cooling, lubrication and chip removal. This leads to better surface quality, removal performance, durability and thermal stability of the machining process.

[0027] In the case of honing tools with an internal fluid supply, the elastic restoring element and the restoring force associated therewith are particularly important. This is because, during the fluid supply, fluid forces occur in the hollow space, which in particular also act on the honing sticks, in particular on the carrier strips. The carrier strips are radially displaceably seated in their honing stick receiving openings and can be pressed outwards like a piston by the fluid pressure and lifted off the feed element.

[0028] The inventors have found that this effect cannot usually be suppressed or can only be suppressed with difficulty using the restoring forces of conventional spiral springs or O-rings. Moreover, high forces can be achieved with the C-shaped elastic restoring element according to the invention even in the initial position, in which the spiral spring or O-ring is still virtually unable to bring about a restoring action. The restoring force or contact force of the elastic restoring element can be so great that lifting of the honing stick from the feed element due to the fluid pressure is avoided.

[0029] In an alternative embodiment, the coolant and / or lubricant is supplied only from the outside or from the outside and from the inside. Alternatively, the honing process can also be performed dry without coolant and / or lubricant.

[0030] In a further development of the invention, the honing tool is a single-strip honing tool, i.e., has only a single honing stick. In this case, two guide strips consisting of hard metal, sintered metal or another hard material (e.g., ceramic material) can be arranged on the outer side of the tool body opposite the honing stick receiving opening, for example, offset by approximately 90° in the circumferential direction. If there is only a single honing stick, the arrangement of the resetting element is particularly simple.

[0031] In some embodiments, the honing stick resetting system has two elastic resetting elements for each honing stick. In this case, the elastic resetting elements can be connected or attached to the honing stick at each axial end region. This makes it possible to provide a uniform distribution of the resetting forces in the axial direction, thereby counteracting an unintentional tilting of the honing stick. The two elastic resetting elements can be attached from the same side or from two opposite sides.

[0032] The honing tool can also be a multi-strip honing tool. In this case, the honing-strip resetting system can have a plurality of axially offset resetting elements in each axial end region of the cutting region equipped with the honing strip.

[0033] Particularly preferred is an embodiment in which the outer side of the tool body, in particular at an axial end region of the honing-stone receiving opening, has an annular groove in the circumferential direction for receiving the elastic restoring element.

[0034] The honing stick according to the invention is suitable and designed for use in a honing tool having a tool body which is tubular at least in sections and which has a cutting region with at least one honing stick receiving opening which passes through from the interior of the tool body to the outside and is used to receive the honing stick. The dimensions of the honing stick and the dimensions of the honing stick receiving opening are matched to one another in such a way that the honing stick is radially movable and can be received in the circumferential direction of the tool body essentially without play between the boundary surfaces of the honing stick receiving opening and has a chamfer on the inner side which projects into the interior of the tool body.

[0035] The honing stick according to the claimed invention is characterized in that the honing stick has a recess, in particular a radial hole, on the outside. Preferably, such a recess is formed in the extension of the elongated cutting coating at each end section of the support stick. The honing stick is therefore particularly suitable for cooperating with a honing tool of the type described herein, which has a honing stick resetting system with a C-shaped elastic resetting element. In this case, the elastic resetting element is configured to partially surround the outside of the tool body in the circumferential direction when the honing stick is installed and to act on the outside of the tool body with the pressing force generated by the expansion in such a way that the honing stick is held in the honing stick receiving opening. The inwardly bent end section of the C-shaped resetting element can engage in the recess.

[0036] If possible, existing honing tools (new tools or already used tools) can be easily retrofitted to take advantage of the advantages of the invention. For this purpose, the invention also provides a conversion kit (or upgrade kit, i.e., Nachrüstsatz), which has at least one honing stick of the above-mentioned type and a suitable number of C-shaped resetting elements cooperating therewith, for example two, three, four, five, six or more resetting elements for each honing stick. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Further advantages and aspects of the invention are apparent from the claims and from the description of an exemplary embodiment of the invention which is explained below with reference to the drawings.

[0038] Figure 1 shows a longitudinal sectional view of a honing tool according to one embodiment;

[0039] Figure 2 Shown honing tool along Figure 1 A cross-sectional view along line II-II;

[0040] Figure 3 Shown honing tool along Figure 1 A cross-sectional view taken along line III-III;

[0041] Figure 4 Shown honing tool along Figure 3 A partial longitudinal section view along line IV-IV;

[0042] Figure 5 Shown honing tool along Figure 3 A partial longitudinal section of line VV;

[0043] Figure 6 Show Figure 1 Oblique perspective view of the free end section of a honing tool. DETAILED DESCRIPTION

[0044] exist Figure 1 1 shows a longitudinal section through an embodiment of the honing tool 100 parallel to the tool axis (rotation axis) 101 of the honing tool 100 . Figure 2 and Figure 3 Shown with Figure 1 A cross-sectional view orthogonal to the tool axis 101 of the honing tool 100 in FIG. Figure 4 and Figure 5 Shows Figure 1 Detail of a longitudinal section of a honing tool 100 in FIG. Figure 6 Shows Figure 1 Detail of an oblique perspective view of a honing tool 100 .

[0045] The honing tool 100 is designed as a single-strip honing tool, i.e., has in its cutting region only a single radially feedable honing stick 200. The honing tool 100 has a tool body 110 which is approximately in the form of a tube open on both sides with a relatively large wall thickness, wherein the outer diameter of the tube changes in sections in the axial direction.

[0046] Figure 1 The end section 180 of the tool body 110 shown on the right in the middle is used to couple the honing tool 100 to a machine tool (or machine tool, i.e., Werkzeugmaschine), in particular to a working spindle of a honing machine. The cutting region of the honing tool 100 is located in the opposite free end section of the tool body, which is introduced into the interior of the hole to be processed for the honing process. In the cutting region, the tool body 110 has a rectangular honing-stick receiving opening 120 that passes through from the interior of the tool body 100 to the outside, and in which the honing stick 200 can be received in a precisely fitting manner when the honing tool 100 is assembled. The axial length of the honing-stick receiving opening 120 is a multiple of the width measured in the circumferential direction.

[0047] The honing-stick receiving opening 120 is bounded by four planar boundary surfaces that are parallel to one another in pairs. Two planar boundary surfaces that act in the circumferential direction are provided parallel to the axial direction, namely a first boundary surface 121 and a second boundary surface 122 that is parallel thereto. The boundary surfaces 121, 122 are each planar and extend parallel to a plane that is spanned by the tool axis 101 and a radial direction that extends centrally between the lateral boundary surfaces 121, 122. In the axial direction, the honing-stick receiving opening 120 is bounded by an upper boundary surface and a lower boundary surface that are each located in a normal plane that is normal to the tool axis 101.

[0048] On the side opposite the honing-stick receiving opening 120, two guide strips 160, 170 made of hard metal, sintered metal or other hard material (e.g. ceramic material) are arranged on the tool and are offset by about 90° in the circumferential direction. The guide strips are supported with their smoothly polished, curved outer surfaces on the inner wall of the hole to be honed. The guide strips can carry a coating, for example made of diamond, which forms a wear-resistant outer surface.

[0049] The honing stick 200 is generally plate-shaped and has a plate-shaped carrier strip 210 made of steel. A cutting coating 220 is applied to the radial outer side 212 of the carrier strip 210, which contains cutting material particles that are bonded into a joint. The cutting coating 220 can be sintered directly to the planar outer side of the carrier strip 210, but the cutting coating can also be glued, welded or fixed to the carrier strip 210 by rivets or screws. It is also possible that a flat bottom 222 that carries the cutting coating 220 is between the cutting coating 220 and the carrier strip 210.

[0050] A flat bevel 211 is formed on the radial inner side of the carrier strip 210 , which interacts in a wedge-shaped drive manner with a complementary flat bevel 131 at the lower end of a feed element 130 guided in the tool body 110 , so that the honing stick 200 is pressed radially outwards in the honing stick receiving opening 120 when the feed element 130 is pressed in the direction of the cutting region of the honing tool 100 by a feed drive installed in the honing machine 100 .

[0051] The dimensions of the honing stick 200 and the honing stick receiving opening 120 are matched to one another in such a way that the honing stick 200 is received between the lateral boundary surfaces 121, 122 so that it can move radially but essentially without play in the circumferential direction of the tool body 110. In the axial direction, i.e. between the upper and lower boundary surfaces, there may be a slight amount of play, but here too a play-free fit is provided as far as possible.

[0052] When manufacturing the honing stone 200 and the tool body 110, care must be taken to ensure that the clearance between the front and rear boundary surfaces 121, 122 of the honing-stick receiving opening 120 is, at a minimum, only greater than the width of the honing stone 200 measured between the front side 201 and the rear side 202 of the honing stone 200 or the carrier strip 210. In the most favorable case, a relatively tight sliding fit should be achieved, so that during assembly, although the honing stone 200 can be pressed manually from the outside into the honing-stick receiving opening 120, the honing stone cannot fall out of the honing-stick receiving opening 120 by itself. However, the honing stone 200 should be able to be moved radially outwards by the action of the feed element 130 pressed downwards.

[0053] Honing tools can be used with an internal coolant supply. An internal coolant supply is particularly advantageous in the case of long holes, since the coolant can be brought to the cutting strand in a very targeted manner for cooling, lubrication and chip transport. This leads to better surface quality, removal performance, durability and thermal stability of the machining process.

[0054] In order to enable an internal coolant supply, the honing tool 100 has at least one fluid supply channel 140 in the tubular tool body 110 for supplying coolant and / or lubricant into the cutting region. The fluid supply channel 140 opens into a hollow space 150 in which the honing stick 200 and the feed element 130 are also located. Figure 5 As can be seen in FIG. 1 , the coolant and / or lubricant passes from the hollow space 150 into the cutting region via two radial bores 141 , 142 on the outer side 113 of the tool body 110 and the axial bore 143 on the end side 114 of the tool body 110 .

[0055] In the case of an internal fluid supply, fluid forces can be generated in the hollow space 150 , which in particular also act on the support strips 210 of the honing sticks 200 and act radially outwardly thereon.

[0056] It has been found that, in particular when using an internal coolant supply (which is guided from the tool body to an outlet opening at the junction of the honing stick), the coolant pressure can be sufficient to lift the carrier strip from the cone or bevel of the feed element at the exposed part of the carrier strip and thus generate a "hydraulic" feed force across the rear surface. This cannot be suppressed or can only be suppressed with difficulty using the restoring force of conventional spiral springs or O-rings.

[0057] In order to avoid this problem, the honing tool 100 is equipped with a honing-stone resetting system 300 which, when the honing stone 200 is installed, acts on the honing stone 200 in such a way that a radial force acts from the outside inwards and presses the honing stone 200 in the direction of the feed element 130 .

[0058] In the exemplary embodiment shown, the honing stick resetting system 300 has two identical C-shaped elastic resetting elements 310, which are explained in more detail below with reference to the resetting elements 310. An elastic resetting element 310 is arranged at each of the two axial end regions 203, 204 of the honing stick 200.

[0059] The elastic reset element 310 is a wire bending component made of spring steel. Spring steel has suitable properties for the application, especially because it can generate a large elastic reset force when the elastic reset element 310 is elastically deformed. For example, the spring steel may have a spring force between about 600 and 1800 N / mm2 The elastic reset element 310 made of round wire basically has the shape of a non-closed arc, with an end section 311 bent radially inward. In an alternative embodiment, the elastic reset element 310 can also be made of a profile wire, which is not circular in cross section, but for example polygonal.

[0060] The non-closed arc section of the elastic reset element 310 defines an opening angle α, wherein the center point of the elastic reset element 310 is the vertex of the opening angle α. The first side of the opening angle α extends from the vertex to the center axis of the radially inwardly bent end section 311 of the elastic reset element 310, and the second side of the opening angle α extends from the vertex to the end point at the other end section 312 of the elastic reset element 310. When the elastic reset element 310 is brought into the honing stick 200 or brought into the tool body 110, the opening angle α increases due to the deformation of the elastic reset element 310, wherein the first side also extends through the center axis of the radial hole 231.

[0061] The radially inwardly bent end section 311 of the elastic reset element 310 preferably has a length that may be between 10% and 40% of the outer diameter of the elastic reset element 310 and / or between 1 and 3 times the wire diameter or wire thickness of the elastic reset element 310. For example, the wire diameter or wire thickness of the elastic reset element 310 may be in the range of between 5% and 20% of the diameter of the tool body 110.

[0062] The tool body 110 furthermore has an annular groove 112 for each elastic restoring element 310, which is introduced into the outer side 113 of the tool body 110. The groove 112 extends over the entire circumference of the tool body 110 and can be produced, for example, by turning. In this case, the annular groove 112 extends at each axial end region 203, 204 of the honing stick 200 or the honing stick receiving opening 120. Furthermore, a groove extends on the radial outer side 212 of each of the non-cutting end sections 213, 214 of the support strip 210, which groove extends in the extension of the annular groove 112 in the reset state of the honing stick 200. Alternatively, the radial outer side 212 of the non-cutting end sections 213, 214 of the support strip 210 can have a shoulder. The non-cutting end sections 213, 214 of the support strip 210 each have a radial hole 231 in the groove. The radial hole 231 is introduced into the carrier strip 210 in such a way that it points in the direction of the tool axis 101 when the honing stick 200 is in the installed state.

[0063] Figure 2 The diagram shows the area of ​​the annular groove 112 and the radial hole 231 along the Figure 1The section line II-II in FIG. 1 passes through a section of the honing tool 100 oriented orthogonally to the tool axis 101 .

[0064] The arrangement of the elastic restoring element 310 on the tool body 110 is described below. This applies analogously to the second elastic restoring element 310 .

[0065] The elastic restoring element 310 is arranged or suspended in the radial hole 231 with its radially inwardly bent end section 311 and partially surrounds the outer side or groove bottom 111 of the annular groove 112 in a C-shaped portion in the circumferential direction. Here, the elastic restoring element 310 has an inner diameter that is smaller than the outer diameter of the annular groove 112 measured at the groove bottom 111 in the relaxed state.

[0066] In order to install the elastic restoring element 310, the bent end section 311 of the elastic restoring element 310 is introduced into the radial hole 231 and the other end section 312 of the elastic restoring element 310 is placed or arranged in the annular groove 112 around the tool body 110 under the elastic deformation of the elastic restoring element 310. Due to the partially open, C-shaped shape of the elastic restoring element 310, the elastic restoring element can be easily installed on the tool body 110. When pushed on laterally, the C-shape temporarily expands elastically until the restoring element is then clamped on the circumference and fixedly held on the tool body under the elastic clamping force.

[0067] In the illustrated embodiment, the elastic restoring element 310 surrounds the annular groove 112 or the outer side 111 of the tool body 110 by approximately 225° in the assembled state and thus leaves a certain circumferential section (see Figure 2 ). In the relaxed state, the elastic restoring element 310 has an opening angle α that is slightly smaller than 135°. This results in that the elastic restoring element 310 can be easily assembled and disassembled.

[0068] Due to the elastic preload of the clamped restoring element, in the reset state or initial state of the honing stick 200, a certain force already acts on the honing stick 200 due to the deformation or elasticity of the elastic restoring element 310, which acts from the outside inwards and presses the honing stick 200 against the feed element 130. In addition, the elastic restoring element 310 is automatically held on the tool body 110 in the installed state.

[0069] Due to the high restoring force acting primarily directly in the radial direction, a possible "hydraulic" advancement of the honing stick 200 can now be prevented, since the mechanical contact between the bevel 211 or the back side of the carrier strip 210 and the bevel 131 or the widening cone of the advancement element 130 is maintained and is not flushed from below by the hydraulic pressure. If a conventional spiral spring were used as the restoring element 310, such a mechanical contact between the honing stick 200 and the advancement element 130 would generally not be maintained or would only be maintained with difficulty due to its low restoring force.

[0070] As shown and the further above-described exemplary embodiments clearly illustrate, the present invention provides a honing tool and a honing stick which can be used to produce such a honing tool, which offer advantages over conventional honing tools and honing sticks, in particular with regard to the mode of action, operational reliability, design and / or handling.

Claims

1. A honing tool (100), comprising: a tool body (110) which is tubular at least in sections and has a cutting region with at least one honing-stone receiving opening (120) extending from the interior of the tool body (110) to the outside and for receiving a honing stone (200); - wherein the dimensions of the honing-stone receiving opening (120) and the honing stone (200) are coordinated with one another such that the honing stone (200) is radially movable and is received substantially without play in the circumferential direction of the tool body (110) between the boundary surfaces (121, 122) of the honing-stone receiving opening (120); and - wherein the honing stone (200) has a chamfer (211) on the inner side thereof extending into the interior of the tool body (110); a feed element (130) guided in the tool body (110), the feed element having a bevel (131) corresponding to the bevel (211) of the honing stick, so that an axial movement of the feed element (130) toward the end of the tool body (110) remote from the spindle causes a radial movement of the honing stick (200) outwards; a honing stick resetting system (300), comprising at least one elastic resetting element (310), which, when the honing stick (200) is installed, acts on the honing stick (200) in such a way that a radial force acts from the outside inwards and presses the honing stick (200) in the direction of the feed element (130); It is characterized in that The elastic restoring element (310) is designed to be C-shaped and partially surrounds the outer side (111) of the tool body (110) in the circumferential direction.

2. The honing tool (100) according to claim 1, further characterized in that: The elastic restoring element (310) surrounds the outer side (111) of the tool body (110) by more than 180° and less than 270°, in particular by about 225°, and / or The elastic restoring element (310) has an opening angle greater than 90° and less than 180° in a relaxed state.

3. The honing tool (100) according to claim 1 or 2, further characterized in that: - The elastic reset element (310) is a wire bending component, wherein: The wire bending part preferably consists of spring steel.

4. The honing tool (100) according to any one of the preceding claims, further characterized in that: The end section (311) of the elastic restoring element (310) facing the honing stone (200) is bent, preferably bent radially inwards, wherein: The elastic restoring element (310) is connectable to the honing stone (200) via the bent end section (311).

5. The honing tool (100) according to any one of the preceding claims, further characterized in that: - the honing stone (200) has a carrier strip (210) and a cutting coating (220) applied to the radial outer side (212) of the carrier strip (210); and The elastic restoring element (310) can be connected to the supporting strip (210).

6. The honing tool (100) according to any one of the preceding claims, further characterized in that: The honing stone (200) has a recess (230), preferably a radial hole (231), on the outer side, into which one end of the elastic restoring element (310) can be hooked.

7. The honing tool (100) according to any one of the preceding claims, further characterized in that: The elastic restoring element (310) has an inner diameter which, in the relaxed state, is smaller than an outer diameter of an outer side (111) of the tool body (110) against which the elastic restoring element (310) abuts.

8. The honing tool (100) according to any one of the preceding claims, further characterized in that: The honing tool (100) has at least one fluid supply channel (140) in a tubular tool body (110), which is used to supply coolant and / or lubricant into the cutting area, wherein the fluid supply channel (140) opens into a hollow space (150) in which the honing stick (200) and the feed element (130) are also located.

9. The honing tool (100) according to any one of the preceding claims, further characterized in that: - The honing tool (100) is a single-strip honing tool.

10. A honing stick (200) for use in a honing tool (100), the honing tool having a tool body (110) which is tubular at least in sections, the tool body having a cutting region with at least one honing stick receiving opening (120) extending from the interior of the tool body (110) to the outside for receiving the honing stick (200); - wherein the dimensions of the honing stick (200) and the dimensions of the honing stick receiving opening (120) are coordinated with one another in such a way that the honing stick (200) is radially movable and can be received between boundary surfaces of the honing stick receiving opening (120) in a circumferential direction of the tool body (110) substantially without play; and - wherein the honing stone (200) has a chamfer (210) on the inner side extending into the interior of the tool body (110); It is characterized by. The honing stone (200) has a recess (230), in particular a radial hole (231), on the outer side, which is used to receive a bent-over end section (311) of a C-shaped elastic restoring element (310); wherein the elastic restoring element (310) is configured to partially surround the outer side of the tool body (110) in the circumferential direction when the honing stick (200) is installed and to act on the outer side of the tool body with a pressing force generated by the expansion in such a way that the honing stick (200) is held in the honing stick receiving opening (120).

11. A conversion kit for manufacturing a honing tool (100), the honing tool being the honing tool according to any one of claims 1 to 9, the conversion kit comprising: at least one honing stick (200) according to claim 10, said honing stick cooperating with a honing stick opening in a tool body (110) of said honing tool (100); A number of C-shaped elastic restoring elements (310) are adapted to the honing stick (200) and the tool body (110) in such a way that the C-shaped restoring elements can be mounted on the tool body by clipping and in the mounted state partially surround the outer side (111) of the tool body (110) in the circumferential direction and act on the honing stick (200) in such a way that a radial force acts from the outside to the inside.

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