Tool segment, grinding tool, grinding tool assembly and grinding machine

Abstract

A tool segment (60) for a grinding tool for surface finishing of building materials has a base body (110) with an end face (112), a rear face (114) facing away from the end face (112), and a circumferential region (122) extending between the end face (112) and the rear face (114). The end face (112) is equipped with at least one hard material cutting element (140, 142). The rear face (114) has at least one fastening element (130) for mounting on a base body of a grinding tool. At least one circumferential side (124) of the circumferential region (122) is equipped with at least one hard material cutting element (150). A grinding tool has at least one such tool segment (60). A grinding machine for surface finishing of building materials has at least one such grinding tool.

Description

[0001] The present disclosure relates to a tool segment for a grinding tool for surface treatment of building materials, to a grinding tool that can carry two or more such tool segments, and to a grinding machine with such a grinding tool.

[0002] Tool segments and grinding tools within the meaning of the present disclosure are used for machining surfaces, typically floors, walls, and ceilings. The present disclosure intentionally does not refer to tools and machines for metalworking.

[0003] Common building materials that are processed with grinding tools equipped with the tool segments mentioned above include plaster, gypsum, screed, synthetic resin coatings, plastic coatings, adhesive layers, paint layers, asphalt, and the like. These materials are therefore relatively soft to medium-hard.

[0004] US 2019 / 389034 A1 discloses a tool segment equipped with sanding pads for a sanding head of a floor-working sanding machine. A sanding tool can be formed using several such tool segments. The tool segment has a base, on the upper side of which sanding pads are arranged. Two circumferential sides of the base are each provided with a retaining flange. The base is tapered, allowing the base with the retaining flanges to engage beneath retaining plates on the sanding head and be secured there. The sanding pads are firmly fixed to the upper side of the base or embedded in recesses in the base. The sanding pads are puck-like or disc-like and therefore have a front end and a circumferential surface.

[0005] From EP 1 321 233 A1, which forms the basis for the preamble of claim 1, grinding tools for machining mineral surfaces such as stone or artificial stone floors, concrete or asphalt surfaces, and similar materials are known. These grinding tools comprise a rotating support plate and at least one tool support element arranged thereon, which is equipped with machining tools. The machining tools consist of PCD elements that are received and secured in receiving pockets formed on the tool support element. PCD stands for polycrystalline diamond, a synthetically produced, hard cutting material with diamond particles embedded in a metal matrix.

[0006] Similar tools are known from DE 10 2009 008 261 A1. Tools equipped with segments are also known from WO 2008 / 100210 A1, DE 72 27 449 U, EP 3 928 894 A1, and DE 299 11 352 U1.

[0007] EP 3 713 709 A1 discloses an attachment for the removal or smoothing of walls or ceilings for a mobile handling device, which is suitable for the use of grinding tools with tool segments for the purposes described above. WO 2005 / 077599 A1 discloses a device for processing hard floors by grinding or polishing.

[0008] Tools equipped with PCD elements and similar hard material cutting elements allow common soft to medium-hard construction materials, such as those mentioned above, to be machined with high stock removal rates. The cutting elements are usually significantly harder than the materials being machined, enabling high feed rates (along the surface).

[0009] However, it has been shown that under certain operating conditions, such tools tend to dig into the materials being machined, making it difficult to advance along the surface being machined. This can lead to the tool digging deeply and becoming stuck in place. At the very least, machining is less consistent than with a reduced grinding tool's smooth running. Shocks and similar load peaks can occur.

[0010] This can occur especially when working on walls and ceilings. It should be noted that when working on floors, the weight of the sander usually ensures a relatively constant contact pressure. However, when working on walls or ceilings, the weight usually does not act in the direction of the surface being worked on, so the contact force and pressure must be applied via the sander.

[0011] This can potentially lead to reduced smoothness during machining, combined with increased dynamic loads on the tool, machine, and machined surface, as well as compromised machining results. Furthermore, noise and vibration levels may increase during machining. This can also lead to increased wear on the grinding tool or grinding machine.

[0012] Against this background, the present disclosure seeks to provide a tool segment for a grinding tool for surface processing of building materials that is particularly powerful and enables high stock removal rates when processing soft to medium-hard building materials. The tool segment is intended to enable the smoothest possible processing with reduced jerking or impact loads. In particular, the tool is intended to be less susceptible to unwanted digging into the surface. Even with potentially fluctuating contact pressure, the tool is intended to enable gentle, smooth processing, leading to a uniform processing result with a smooth surface.

[0013] Finally, the present disclosure aims to provide a grinding tool that carries a plurality of such tool segments. Furthermore, a grinding machine that utilizes such grinding tools is to be provided.

[0014] According to a first aspect, the present disclosure relates to a tool segment for a grinding tool for surface treatment of building materials, comprising: a base body with a front side, a rear side facing away from the front side and a circumferential region which extends between the front side and the rear side, wherein the front side is equipped with at least one hard material cutting element, wherein the rear side has at least one fastening element for receiving on a base body of a grinding tool, wherein at least one circumferential side of the circumferential region is equipped with at least one hard material cutting element, and wherein the base body has, on the at least one circumferential side equipped with the cutting element, a raised web in a cutting direction behind the at least one cutting element, which web serves as a spacer for limiting a penetration depth.

[0015] The task of revelation is solved in this way.

[0016] The at least one hard material cutting element on the peripheral side acts laterally, i.e., its cutting edge extends laterally beyond the peripheral side. At least significant sections of the at least one hard material cutting element on the peripheral side are located behind the face, as seen from the surface to be machined. The at least one hard material cutting element on the peripheral side leads to smoother machining overall. Machining is less rough. A grinding tool equipped with a plurality of such tool segments, which rotate around a center, can penetrate the surface to be machined with its face (axially) (feed motion). However, if the feed motion is too large, there is a risk of the tool "digging in." This would complicate feed movements (perpendicular to the feed motion or parallel to the face).The lateral teeth allow the grinding tool to run more smoothly along the surface to be worked on (floor, wall or ceiling).

[0017] With conventional tool segments, the main removal performance is usually provided by the cutting elements on the face. This is now supplemented by at least one cutting element on the peripheral side, which also contributes to material removal. The at least one cutting element on the peripheral side is also intended to ensure quieter, smoother running of the grinding tool during machining. The at least one cutting element on the peripheral side is intended to maintain working capacity through lateral removal in the event of the grinding tool digging in. This enables overall smoother, less rough machining with a grinding tool equipped with a plurality of such tool segments.

[0018] The tool segment typically has a polygonal basic shape. When viewed from the face (front side), which faces the workpiece (surface to be machined) during machining, the basic shape of the tool segment resembles, for example, a bicycle pedal (the side that is in contact with the foot).

[0019] The grinding tool is particularly suitable for processing building materials. Examples include mineral and / or thermoplastic building materials, such as plaster, screed, plastic coatings, adhesives, paint, asphalt, and the like. These materials are relatively soft to medium-hard, compared to, for example, hardened concrete.

[0020] The front and rear sides of the tool segment are oriented at least approximately parallel to each other. The front side is the side facing the workpiece. The rear side, when mounted, faces a base body of the grinding tool.

[0021] The front end and the peripheral area, or rather its peripheral sides, are oriented approximately perpendicular to each other. For manufacturing reasons, this may also include slight deviations from a strict 90° angle. For example, the angle of inclination between the front end and the peripheral side is between 75° (degrees) and 105° (degrees).

[0022] The at least one cutting element on the front side and the at least one cutting element on the peripheral side each have at least one cutting edge. For example, the cutting elements are designed as truncated cones (or truncated cone sections) or cylinders (or cylinder sections) partially embedded in the base body. Accordingly, in one exemplary embodiment, each cutting element has a cutting edge corresponding to a circular arc or a similarly convexly curved curve.

[0023] Typically, the front side has a higher number of cutting elements than the peripheral side. For example, the base body has a height between the front side and the rear side, where the height defines the transverse extent of the peripheral area surrounding the base body. The height of the base body corresponds, for example, to less than 50% of the longitudinal extent of the base body (parallel to the cutting direction). In another embodiment, the height of the base body corresponds to less than 40% of the longitudinal extent of the base body. In another embodiment, the height of the base body corresponds to less than 30% of the longitudinal extent of the base body.

[0024] The base body has a width perpendicular to its longitudinal extent, which amounts to, for example, 60% to 110% of the longitudinal extent. In another exemplary embodiment, the width comprises approximately 70-90% of the longitudinal extent. The longitudinal extent and the width approximately define the size (area) of the front and rear sides. It is understood that, even with a substantially polygonal design, the tool segment can have rounded edges (unless required for machining purposes) and other design elements that deviate from an ideal polygon (quadrilateral, rectangle, square, and the like).

[0025] Typically, one or more rows of cutting elements are arranged on the face, offset from one another purely along the cutting direction. Within a row, cutting elements can be arranged strictly next to one another, so that the row is aligned essentially perpendicular to the cutting direction. However, a slight offset between adjacent cutting elements is also conceivable within a row; for example, the row would then be slightly inclined relative to a perpendicular to the cutting direction.

[0026] Generally, the number of cutting elements on the front and the peripheral side is not excessively large. In one exemplary embodiment, the tool segment comprises one or two rows of cutting elements on the front, each with two to five cutting elements. In one exemplary embodiment of the tool segment, a maximum of one or two cutting elements are arranged on one peripheral side.

[0027] Typically, the base body of the tool segment is equipped with a plurality of cutting elements. These cutting elements are typically designed as PCD cutting elements, i.e., cutting elements made of polycrystalline diamond particles. The connection to the base body is achieved, for example, by soldering or sintering. This is not to be understood as a limitation.

[0028] For the purposes of the present disclosure, cutting elements on the face of the tool segment may also be referred to as face-side cutting elements. For the purposes of the present disclosure, cutting elements on a peripheral side of the tool segment may also be referred to as peripheral side cutting elements.

[0029] According to an exemplary embodiment, the peripheral side equipped with the at least one cutting element faces away from a center of the base body when equipped. In other words, the peripheral side cutting element is located on the outside of the grinding tool, which is equipped with the tool segment. In this way, the cutting element can remove material laterally as the grinding tool is advanced. This simplifies machining when the grinding tool has already penetrated the workpiece.

[0030] According to a further exemplary embodiment, the base body has an at least approximately rectangular or quadrangular outline, wherein at least one side of the outline is convexly curved, and wherein the equipped peripheral side is arranged on the convexly curved side of the outline. This ensures that the peripheral side cutting element projects beyond the circumference of the grinding tool during machining and can remove material there. The at least approximately rectangular or quadrangular design of the outline does not preclude the presence of curves, draft angles, and the like. For example, the outline resembles the outline of a bicycle pedal.

[0031] According to a further exemplary embodiment, a first circumferential side and a second circumferential side facing away from the first circumferential side are each equipped with at least one cutting element, wherein the first circumferential side faces away from a center of the base body in the equipped state, and wherein the second circumferential side faces a center of the base body in the equipped state. This takes into account the fact that a ring is milled into the surface upon rotation of the grinding tool and an exclusively axial feed.

[0032] This applies, for example, to grinding tools that rotate around a center during machining, but where there is no superimposed movement (compare planetary movement in grinding tool assemblies with multiple grinding tools). The grinding tools are usually disc-shaped or ring-shaped and equipped with tool segments in a ring section around their circumference. However, the grinding tools are usually not equipped with tool segments across their entire radius. This means that in the case of a pure feed movement (axial movement of the grinding tool towards the workpiece), an annular recess is created in the workpiece. Once the tool has already dug into the workpiece, peripheral side cutting elements directed inwards towards the center and outwards away from the center help to ensure that the feed movement can take place easily.

[0033] According to a further exemplary embodiment, the at least one peripheral cutting element and the at least one end cutting element are oriented identically with respect to a cutting direction. In other words, for example, one cutting edge of the peripheral cutting elements and one cutting edge of the end cutting elements are oriented substantially perpendicular to the cutting direction. This does not change the fact that the peripheral cutting elements and the end cutting elements are arranged on different surfaces on the tool segment.

[0034] In the context of the present disclosure, the cutting direction is at least approximately parallel to a tangent to the circumference of a grinding tool which is equipped with a tool segment according to the disclosure.

[0035] According to another exemplary embodiment, the base body has a raised ridge on its front side in a cutting direction behind the at least one cutting element, which serves as a spacer to limit the penetration depth. The ridge can also be referred to as a buffer element. The raised design comprises, for example, an outwardly curved shape, wherein the ridge has, for example, a convex cross-section. The raised ridge can also contribute to increasing smoothness during machining. Furthermore, the ridge can protect the cutting elements from excessive wear and / or breakage.

[0036] According to a further exemplary embodiment, the end face web has a longitudinal extension along the end face that is approximately perpendicular to the cutting direction. This can also include slight deviations from a strict 90° angle. For example, an angle of the longitudinal extension to the cutting direction is between 75° (degrees) and 105° (degrees). In the context of the present disclosure, an end face web is a web that extends along the end face. In the case of one or more rows of cutting elements on the end face of the tool segment, the at least one web can be oriented approximately parallel to the respective rows.

[0037] According to a further exemplary embodiment, a first end face web and a second end face web are formed on the end face, which are arranged one behind the other in the cutting direction, and wherein, in particular, a single row of cutting elements is arranged on the end face in front of the first end face web and the second end face web in the cutting direction. The row of cutting elements comprises, for example, two to five cutting elements arranged side by side.

[0038] On the at least one circumferential side equipped with the cutting element, the base body has a raised ridge behind the at least one cutting element in a cutting direction. This ridge serves as a spacer to limit the penetration depth. This allows for more uniform and smoother machining. For the purposes of the present disclosure, a ridge on a circumferential side is referred to as a circumferential side ridge. Similar to the end face ridge, the circumferential side ridge can also have an outwardly curved design, for example, a convex cross-section.

[0039] According to another exemplary embodiment, the circumferential side web has a longitudinal extension along the circumferential side that is approximately perpendicular to the cutting direction. This can also include slight deviations from a strict 90° angle. For example, an angle of the longitudinal extension to the cutting direction is between 75° (degrees) and 105° (degrees). The longitudinal extension of the circumferential side web is oriented approximately perpendicular to the front. In one exemplary embodiment, the circumferential side web extends along the circumferential side approximately between the rear side and the front. The longitudinal extension of the circumferential side web can correspond to the height of the base body.

[0040] According to another exemplary embodiment, at least one circumferential side is equipped with two or more cutting elements, wherein the two or more cutting elements are arranged one behind the other in the cutting direction and at least partially offset from one another in a height direction perpendicular to the face. In one exemplary embodiment, the (imaginary) diameter of a circumferential side cutting element corresponds approximately to 50% to 100% of the height of the base body. In one exemplary embodiment, the (imaginary) diameter of a circumferential side cutting element corresponds approximately to 60-90% of the height of the base body. The use of two cutting elements arranged one behind the other in the cutting direction, which may be slightly offset from one another (in height), ensures a larger overall "working width" on the circumferential side.

[0041] In one exemplary embodiment, identical cutting elements with the same (imaginary) diameter are used for both the front and at least one peripheral side. This allows for standardized cutting element production.

[0042] According to a further aspect, the present disclosure relates to a grinding tool with a base body rotatable about a center (rotation axis), which is ring-shaped or disc-shaped and has at least two or more receptacles distributed over the base body, wherein the grinding tool is equipped with at least one tool segment according to at least one of the embodiments described herein, which sits in one of the receptacles. By way of example, a plurality of tool segments are provided, which are distributed along a circle around the center of the grinding tool. The grinding tool can also be referred to as a grinding disc. The use of tool segments to equip the grinding tool has the advantage that application-specific, specific tool segments can be used.

[0043] According to an exemplary embodiment of the grinding tool, three or more receptacles are distributed over the base body, each carrying a tool segment, wherein the circumferential side of the tool segments, each equipped with at least one cutting element, faces away from a center of the base body and in particular projects radially beyond a circumference of the base body.

[0044] This allows the grinding tool to also act laterally (radially) on the workpiece being worked on (floor, wall, or ceiling). This effectively prevents the grinding tool from digging into the workpiece and becoming stuck.

[0045] According to a further aspect, the present disclosure relates to a grinding tool assembly with a carrier rotatable about a global center of rotation and with two or more grinding tools according to at least one of the embodiments described herein, wherein the rotation axes of the two or more grinding tools are fixed relative to one another and are received on the rotatable carrier in a manner distributed around the global center of rotation. The grinding tool assembly can also be described as a multi-disk grinding tool. In other words, there are several disk-shaped grinding tools, each rotatable about its center, wherein the entirety of the grinding tools is rotatable about a common center of rotation. In other words, the movement of the individual grinding tools resembles a planetary movement.

[0046] The individual grinding tools move along a (circular) orbit around a global center of rotation and rotate on their own axis. This allows for high stock removal rates. Even with such a design, it is advantageous to provide the tool segments with a cutting element at least on their outer circumference.

[0047] According to a further aspect, the present disclosure relates to a grinding machine for surface processing of building materials, in particular for processing floors, walls and / or ceilings, comprising a grinding tool equipped with at least one tool segment according to at least one of the embodiments described herein. Generic machines are usually referred to as grinding machines. This expressly does not contradict the convention common in metalworking, namely that grinding is machining with a geometrically undefined cutting edge. In the field of construction machinery, however, the term grinding machines is used, even if the tool segments are equipped with individual cutting elements (with a geometrically defined cutting edge).

[0048] According to an exemplary embodiment, the grinding machine is designed as an attachment for mounting on a mobile work machine, in particular on the boom of a mobile work device or an excavator. This design has the advantage that the grinding machine can also be used to work on walls and ceilings, because the mobile work machine can not only support the weight of the grinding machine but also apply the necessary contact and feed forces. It is understood that the grinding machine can alternatively also be designed as a conventional floor-guided grinding tool. Tool segments according to the disclosure simplify the processing of surfaces made of relatively soft building materials, in particular.

[0049] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present disclosure.

[0050] Further features and advantages of the disclosure will become apparent from the following description and explanation of several exemplary embodiments with reference to the drawings. Fig. 1: a perspective frontal view of an embodiment of a grinding machine for floor processing; Fig. 2: a perspective view of an embodiment of a grinding machine that can be coupled to a mobile work machine for processing floors, walls, or ceilings; Fig. 3: a frontal schematic view of a grinding tool equipped with a plurality of tool segments; Fig. 4: a frontal schematic view of a grinding tool assembly comprising several grinding tools equipped with a plurality of tool segments; Figs. 5-7: three views of an embodiment of a tool segment equipped with cutting elements and having a lateral cutting element; Figs. 8-10: three views of a further embodiment of a tool segment with two lateral cutting elements; Fig.11: a frontal view of a further embodiment of a tool segment which is equipped with at least one cutting element on two circumferential sides; Fig. 12: a frontal view of a further embodiment of a tool segment which is equipped with at least one cutting element on two circumferential sides; Fig. 13: a frontal view of a further embodiment of a tool segment which is equipped with at least one cutting element on two circumferential sides; Fig. 14: a frontal view of a further embodiment of a tool segment which is equipped with at least one cutting element on two circumferential sides; Fig. 15: a mobile work machine designed as a remote-controllable work device; and Fig. 16: a mobile work machine designed as an excavator.

[0051] Fig. 1 shows a perspective view of a grinding machine designated 10. The grinding machine 10 is in Fig. 1with the handle folded in, i.e. not in an operating position. The grinding machine 10 comprises a chassis 12, which carries a drive 14 for driving a grinding tool 20 surrounded by a protective cover 16. The grinding machine 10 according to Fig. 1 is particularly suitable for soil cultivation. The weight of the grinding machine 10 presses the grinding tool 20 against the ground.

[0052] Fig. 2illustrates a further embodiment of a grinding machine designated overall by 30. The grinding machine 30 is designed as an attachment 32, which has a coupling unit 34 for attachment to a mobile work machine. The grinding machine 30 is not operable on its own (without a carrier machine). The grinding machine 30 has a drive head 36, which is designed, for example, as a hydraulic drive. Furthermore, an articulated suspension 38 is provided for the drive head 36. To ensure the required contact force, a pretensioning unit 40 is provided. The drive head 36 comprises a protective cover 38, which in the exemplary embodiment comprises a grinding tool assembly 48 with a plurality of grinding wheels 50. For a more detailed design of the Fig. 2 With regard to the grinding machine 30 illustrated, reference is made to the above-mentioned EP 3 713 709 A1, which discloses such an attachment for removing or smoothing machining.

[0053] The grinding machine 10 according to Fig. 1 has a single disc-shaped grinding tool 20. The grinding machine 30 according to Fig. 2 has three grinding tools 50 that form a grinding tool assembly 48. This assignment is not mandatory. It is understood that floor-mounted grinding machines 10 with a grinding tool assembly with multiple grinding tools are also conceivable. Likewise, grinding machines 30 designed as an attachment 32, which are equipped with single-disk grinding tools, are also conceivable.

[0054] Fig. 3 illustrates, by way of a frontal view, an exemplary embodiment of a grinding tool 20 which is suitable for use in the grinding machine 10 according to Fig. 1 and if necessary also for use with the grinding machine 30 according to Fig. 2 suitable.

[0055] The grinding tool 20 is equipped with a plurality of tool segments 60. The grinding tool 20 is located (from the perspective of the surface to be machined) within a protective cover 16. The grinding tool 20 comprises a base body 62 that is rotatable about a center 64 that defines a rotation axis. The tool segments 60 thus rotate along a circular path around the center 64. The rotational movement is illustrated by an arrow labeled 66. The grinding tool 20 is designed as a disc-shaped unit.

[0056] The base body 62 comprises a plurality of receptacles 68 for receiving a tool segment 60. In Fig. 3one receptacle 68 is explicitly shown. The remaining receptacles 68 are each covered by a tool segment 60. Overall, the grinding tool 20 in the exemplary embodiment is designed to accommodate six tool segments 60, with six receptacles 68 also being provided. An offset angle between the receptacles 68 is 60° in the exemplary embodiment. In exemplary embodiments, the grinding tool 20 is designed to accommodate three to eight tool segments 60. To secure the tool segments 60 within the receptacles 68, a retaining ring 70 is used in the exemplary embodiment. The retaining ring 70 has a plurality of cam tracks assigned to the respective receptacles 68, which secure the tool segments 60 in the receptacles 68 in a form-fitting manner (and optionally in a force-fitting manner).

[0057] Fig. 4illustrates, by way of a frontal view, an exemplary design of a grinding tool assembly 48 with grinding tools 50, which are suitable for use in the grinding machine 30 according to Fig. 2 and if necessary also for use with the grinding machine 10 according to Fig. 1 suitable.

[0058] The grinding tool assembly 48 comprises a carrier 80 (in Fig. 4 shown only symbolically), which is rotatable about a global center of rotation 82; compare an arrow labeled 84 to illustrate the (global) rotation of the carrier 80. In the exemplary embodiment, three grinding tools 50 are mounted on the carrier 80, each offset by 120° from one another with respect to the global center of rotation 82. It is understood that in other embodiments, the grinding tool assembly 48 can also accommodate a number of grinding tools 50 other than three. The grinding tools 50 are each disk-shaped.

[0059] Each of the grinding tools 50 is designed to accommodate a plurality of tool segments 60. The grinding tools 50 have a base body 92 that is rotatable about a center 94 that defines a rotation axis; see also the arrow labeled 96 for illustrating the (local) rotational movement. In the embodiment according to Fig. 4 Three tool segments 60 are each attached to corresponding receptacles (covered by the tool segments 60) in the base body 92. In the exemplary embodiment, the offset angle between the tool segments 60 is 120°. A retaining ring 100 is provided to secure the position, which secures the tool segments 60 to / in the base body 92 in a form-fitting and / or force-fitting manner.

[0060] With reference to the Figures 5-14 Various embodiments of tool segments according to the disclosure are illustrated and explained in more detail.

[0061] The Figures 5-7illustrate, using three views, a tool segment designated 60. The tool segment 60 has a base body 110 which is approximately rectangular in shape, wherein at least the corners may be rounded and individual flanks may be curved. A side of the base body 110 facing the surface to be machined is referred to as the end face 112. A side facing away from the end face 112, which faces a respective base body 62, 92 of the grinding tool 20, 50 (cf. Fig. 3 and Fig. 4 ) is referred to as back side 114, compare Fig. 6 . Especially in frontal view, compare Fig. 7 shows the approximately rectangular floor plan 120, the shape of which in the exemplary embodiment resembles a bicycle pedal.

[0062] A peripheral region 122 extends between the front 112 and the rear 114. The peripheral region 122 follows the silhouette of the plan view 120. The height of the tool segment 60 between the front 112 and the rear 114 is smaller than the longitudinal extent and transverse extent in the plan view according to Fig. 7 .

[0063] The peripheral area 122 comprises, in the given design of the floor plan 120, four peripheral sides, of which the peripheral side 124 in Fig. 5 and Fig. 7 On the rear side 114, a fastening element 130 is formed (see Fig. 6 ), which in the embodiment is designed as an undercut fastening web and is part of a dovetail guide for receiving in one of the receptacles 68 of the base bodies 62, 92 (see also Fig. 3 and Fig. 4). In the assembled state of the tool segment 60, the fastening element 130 is oriented toward the center and tapers slightly toward the center. The fastening element 130 can engage at least partially in the receptacle 68 with a positive fit and be secured there.

[0064] Fig. 7 further illustrates a cutting direction by means of an arrow labelled 132 and a (radial) direction towards a centre by means of an arrow labelled 134 (compare the centre 64 according to Fig. 3 and the center 94 according to Fig. 4). This results in the orientation of the tool segment 60 in the mounted state on the grinding tool 20, 50. The peripheral side 124 is accordingly facing away from the center. In the context of the present disclosure, the arrow 134 or the associated direction toward the center 94 is opposite to an imaginary (at least momentary) working direction, in which the entire grinding tool 20, 50 is usually moved radially (away from the center 94) in order to remove material. It is understood that the respective tool segment 60 rotates around the center 94 during this process.

[0065] Arranged on the face 112 are a plurality of cutting elements 140, 142 that are raised relative to a base surface of the face 112. In the exemplary embodiment, these are a first row of cutting elements 140 and a second row of cutting elements 142. The two rows are arranged one behind the other in the cutting direction 132 and slightly offset from one another with respect to the radial direction 134.

[0066] A web 144 is formed on the end face 112 in the cutting direction 132, behind the cutting elements 140, 142. In the exemplary embodiment, the web 144 is designed as a cylinder partially recessed into the end face 112. During machining, the web 144 serves as a spacer or buffer element for the cutting elements 140, 142.

[0067] However, the tool segment 60 is equipped with a cutting element 150 not only on its end face 112, but also on the radially outwardly oriented circumferential side 124. The cutting element 150 is oriented in the cutting direction 132 in the same way as the cutting elements 140, 142.

[0068] In the exemplary embodiment, the cutting elements 140, 142, 150 are each designed as truncated cones (or truncated cone sections) or cylinders (or cylinder sections) that are partially recessed into the base body 110. A corresponding circular area of ​​the contour is aligned in the cutting direction 132, with an arc of the contour forming the cutting edge. In the exemplary embodiment, the cutting elements 140, 142, 150 are designed as PCD cutting elements.

[0069] Behind the cutting element 150, on the peripheral side 122, is a web 154, which, similar to the web 144, is designed as a cylinder partially embedded in the base body 110. The web 154 acts as a spacer for the cutting element 150.

[0070] The cutting element 150 can engage laterally with the material being removed during operation of the grinding tool 20, 50. This prevents the grinding tool 20, 50 from digging in and jamming and allows for more uniform machining overall. This can result in better machining quality and reduce wear on the tool and machine.

[0071] The Figures 8-10 illustrate, using three views, a tool segment designated 160. The tool segment 160 is assigned to the tool segment 60 according to the Figures 5-7 at least similarly designed. The tool segment 160 has a base body 210 which extends between a front side 212 and a rear side 214. The plan view 220 ( Fig. 10 ) resembles the floor plan 120 of the tool segment 60 according to Fig. 7. A circumferential region 222 extends between the rear side 214 and the front side 212. A side of the circumferential region 222 facing away from the respective center 64, 94 of the grinding tool 20, 50 in the mounted state is designated by 224.

[0072] On the back 214, a raised fastening element 230 is formed, compare Fig. 9 . In Fig. 10 An arrow labeled 232 illustrates the cutting direction. An arrow labeled 234 indicates a radial direction toward the respective center 64, 94 of the grinding tool 20, 50.

[0073] On the end face 212, the tool segment 160 is equipped with cutting elements 240, 242, which in the exemplary embodiment form two rows arranged one behind the other and offset from one another. A web 244 is formed behind the cutting elements 240, 242.

[0074] In the exemplary embodiment, a first cutting element 250 and a second cutting element 252 are arranged on the peripheral side 224. The second cutting element 252 is arranged behind the first cutting element 250 in the cutting direction 232. Fig. 8 and Fig. 9 It is evident that there is also a slight height offset (perpendicular to the planar extension of the front 212) between the cutting elements 250, 252. In this way, the height of the peripheral side 224 can be well covered or utilized.

[0075] The Figures 11-14 illustrate further designs of tool segments 260, 360, 460, 560 using top views. A view of the front of the tool segments 260, 360, 460, 560 is shown. For further views and related design features, reference is made to the figures already described in connection with the Figures 5-10illustrated tool segments 60, 160. In each case, an identical, or at least similar, design may be present, so that repetitions are omitted.

[0076] Fig. 11 illustrates a tool segment 260 which corresponds to the tool segment 160 according to the Figures 8-10 is designed similarly. The orientation of the tool segment 260 is indicated by arrows 332 for the cutting direction and 334 for the (radial) direction toward the center of the respective grinding tool. Similar to the tool segment 160, a front-end assembly with cutting elements 340, 342 and a web 344 is provided, as well as a lateral assembly on the peripheral side 324 with a first cutting element 350 and a second cutting element 352. The cutting elements 350, 352 can be slightly offset relative to one another (perpendicular to the viewing plane).

[0077] In addition, however, a further cutting element 356 is provided on a circumferential side 326 facing away from the circumferential side 324. The circumferential side 326 faces the center when fitted, compare arrow 334. Basically, the cutting element 356 is designed and oriented similarly to the cutting elements 350, 352. During machining, the cutting element 356 is oriented not outwards, but inwards towards the center. This takes into account the fact that with a buried tool an annular recess is usually created, with material also remaining within the annular recess. If the tool is then to be moved laterally along the surface to be machined, the inwardly oriented cutting element 356 can contribute to removing the material in the center.

[0078] Fig. 12 illustrates a tool segment 360 corresponding to the tool segment 260 according to Fig. 11is designed very similarly. The orientation of the tool segment 360 is indicated by arrows 432 for the cutting direction and 434 for the (radial) direction towards the center of the respective grinding tool. Similar to the tool segment 360, the end face is provided with cutting elements 440, 442 and a web 444. A cutting element 450 and a web 454 are formed on a circumferential side 424 facing away from the center. A cutting element 356 is formed on a circumferential side 426 facing the center. In other words, the design of the circumferential side 424 is similar to that of the circumferential side 124 of the tool segment 60. In contrast, the design of the circumferential side 426 is similar to that of the circumferential side 326 of the tool segment 260.

[0079] Fig. 13 illustrates a tool segment 460 corresponding to the tool segment 260 according to Fig. 11is designed very similarly. The orientation of the tool segment 460 is indicated by arrows 532 for the cutting direction and 534 for the (radial) direction towards the center of the respective grinding tool. Similar to the grinding tool 260, it is provided with cutting elements 550, 552 on a circumferential side 524 facing away from the center and with a cutting element 556 on a circumferential side 526 facing the center. The end-face equipment of the tool segment 460 has in the embodiment according to Fig. 13 a (single) row of cutting elements 540. Two webs 544, 546 are provided behind the cutting elements 540 in the cutting direction 532. In this way, even smoother running can be achieved, although the front-end removal rate may be slightly reduced.

[0080] Fig. 14 illustrates a tool segment 560 corresponding to the tool segment 460 according to Fig. 13is designed similarly. The orientation of the tool segment 560 is indicated by arrows 632 for the cutting direction and 634 for the (radial) direction towards the center of the respective grinding tool. Similar to the tool segment 460, the tool segment 560 is also equipped on the front side with a (single) row of cutting elements 640 and two webs 644, 646. Furthermore, the circumferential side 624 facing away from the center is equipped with a cutting element 650 and a web 654, which is arranged behind the cutting element 650 in the cutting direction 632. Finally, the circumferential side 626 facing the center is also equipped with a cutting element 656 and a web 658, which is arranged behind the cutting element 656 in the cutting direction 632.

[0081] Fig. 15illustrates a mobile work machine designed as a mobile work device 700. The mobile work device 700 is designed to accommodate a grinding machine 30 and in Fig. 15 equipped with such a grinding machine 30. Compare also the illustration of the grinding machine 30 in Fig. 2 The mobile working device 700 is remotely controllable. The mobile working device 700 has a chassis 702 that carries a superstructure 704. A boom 706 is pivotally mounted on the superstructure 704. At an end of the boom 706 facing away from the superstructure 704, a receptacle 710 is formed, to which the coupling unit 34 (see Fig. 2 ) of the grinding machine 30 can be coupled.

[0082] Fig. 16illustrates a mobile work machine designed as an excavator 800. The excavator 800 has a chassis 802 that carries a superstructure 804. The superstructure 804 accommodates control elements for a driver / operator. A boom 806 is pivotally mounted on the superstructure 804. At an end of the boom 806 facing away from the superstructure 804, a receptacle 810 is formed, to which the coupling unit 34 (cf. Fig. 2 ) of the grinding machine 30 can be coupled.

Claims

1. A tool segment (60, 160, 260, 360, 460, 560) for a grinding tool (10, 30) for surface processing of building materials, comprising: - a main body (110, 210) with a front (112, 212), a rear side (114, 214) facing away from the front (112, 212), and a peripheral area (122, 222) extending between the front (112, 212) and the rear side (114, 214), wherein the front (112, 212) is equipped with at least one hard material cutting element (140, 142; 240, 242; 340, 342; 440, 442; 540; 640), wherein the rear side (114, 214) has at least one mounting element (130, 230) for attachment to a base body (62, 92) of a grinding tool (20, 50), characterized in that at least one peripheral side (124, 224, 324, 424, 524, 624) of the peripheral area (122, 222) is equipped with at least one hard material cutting element (150; 250; 350, 352; 450; 550, 552; 650), and the main body (110, 210) comprises, on the at least one peripheral side (124, 424, 624) that is equipped with the cutting element (150, 450, 650), in a cutting direction (132, 232, 332, 432, 532, 632) behind the at least one cutting element (150, 450, 650), an elevated bar (154, 454, 654) that serves as a spacer for limiting a penetration depth.

2. . The tool segment (60, 160, 260, 360, 460, 560) according to claim 1, wherein the main body (110, 210) has an at least approximately rectangular or quadrangular layout (120, 220), wherein at least one side of the layout (120, 220) is convexly curved, and wherein the equipped peripheral side (124, 224, 324, 424, 524, 624) is arranged on the convexly curved side of the layout (120, 220).

3. . The tool segment (60, 160, 260, 360, 460, 560) according to claim 1 or 2, wherein the at least one peripheral side cutting element (150; 250; 350, 352; 450; 550, 552; 650) and the at least one front face cutting element (140, 142; 240, 242; 340, 342; 440, 442; 540; 640) are oriented in the same direction with respect to a cutting direction (132, 232, 332, 432, 532, 632).

4. . The tool segment (60, 160, 260, 360, 460, 560) according to any one of claims 1-3, wherein the main body (110, 210) comprises, at its front (112, 212) in a cutting direction (132, 232, 332, 432, 532, 632) behind the at least one cutting element (140, 142; 240, 242; 340, 342; 440, 442; 540; 640), an elevated bar (144; 244; 344; 444; 544, 546; 644, 646) which serves as a spacer to limit a penetration depth.

5. . The tool segment (60, 160, 260, 360, 460, 560) according to claim 4, wherein the front face bar (144; 244; 344; 444; 544, 546; 644, 646) has a longitudinal extension, in particular along the front (112, 212), which is perpendicular to the cutting direction (132, 232, 332, 432, 532, 632).

6. . The tool segment (60, 160, 260, 360, 460, 560) according to claim 4 or 5, wherein a first front face bar (544, 644) and a second front face bar (546, 646) are formed on the front (112, 212), which are arranged one behind the other in the cutting direction (132, 232, 332, 432, 532, 632), wherein, in particular, in the cutting direction (132, 232, 332, 432, 532, 632) in front of the first front face bar (544, 644) and the second front face bar (546, 646), a single row of cutting elements is arranged at the front (112, 212).

7. . The tool segment (60, 160, 260, 360, 460, 560) according to any one of claims 1-6, wherein the peripheral side bar (154, 454, 654) has a longitudinal extension along the peripheral side (124, 424, 624) that is perpendicular to the cutting direction (132, 232, 332, 432, 532, 632).

8. . The tool segment (60, 160, 260, 360, 460, 560) according to any one of claims 1-7, wherein the at least one peripheral side (224, 324, 524) is equipped with two or more cutting elements (250, 252; 350, 352; 550, 552), wherein the two or more cutting elements (250, 252; 350, 352; 550, 552) are arranged one behind the other in the cutting direction (132, 232, 332, 432, 532, 632) and are offset from one another at least partially in a height direction perpendicular to the front (112, 212).

9. . A grinding tool (20, 50) with a base body (62, 92) that is rotatable about a center (64), that is designed in a ring shape or disc shape and that has at least two or more receptacles (68) distributed over the base body (62, 92), and with at least one tool segment (60, 160, 260, 360, 460, 560) according to any one of claims 1-8, which is seated in one of the receptacles (68).

10. . The grinding tool (20, 50) according to claim 9, wherein three or more receptacles (68) are distributed over the base body (62, 92) and each carry a tool segment (60, 160, 260, 360, 460, 560), and wherein the peripheral side (124, 224, 324, 424, 524, 624) of the tool segments (60, 160, 260, 360, 460, 560) that is respectively equipped with at least one cutting element (150; 250; 350, 352; 450; 550, 552; 650), is facing away from a center (64) of the base body (62, 92) and in particular extending radially beyond a perimeter of the base body (62, 92).

11. . The grinding tool (20, 50) according to claim 9 or 10, wherein, at the tool segment (60, 160, 260, 360, 460, 560), the peripheral side (124, 224, 324, 424, 524, 624) that is equipped with at least one cutting element (150; 250; 350, 352; 450; 550, 552; 650) is facing away from a center (64) of the base body (62, 92) of the grinding tool (20, 50) in the equipped state.

12. . The grinding tool (20, 50) according to any one of claims 9-11, wherein, at the tool segment (60, 160, 260, 360, 460, 560), a first peripheral side (324, 424, 524, 624) and a second peripheral side (326, 426, 526, 626) are each equipped with at least one cutting element (350, 352, 356; 450, 456; 550, 552, 556; 650, 656), wherein the first peripheral side (324, 424, 524, 624) in the equipped state is facing away from a center (64) of the base body (62, 92) of the grinding tool (20, 50), and wherein the second peripheral side (326, 426, 526, 626) in the equipped state is facing the center (64).

13. . A grinding tool assembly (48) with a support (80) that is rotatable about a global rotation center and with two or more grinding tools (50) according to any one of claims 9-12, wherein the rotation axes (64) of the two or more grinding tools (50) are fixed relative to each other and are distributed about the global rotation center (82) on the rotatable support (80).

14. . A grinding machine (10, 30) for surface processing of building materials, in particular for processing floors, walls and / or ceilings, with a grinding tool (20, 50) equipped with at least one tool segment (60, 160, 260, 360, 460, 560) according to any one of claims 1-8.

15. . The grinding machine (30) according to claim 14, wherein the grinding machine (30) is arranged as attachment equipment for mounting (32) on a mobile work machine (700, 800), in particular on a boom (706, 806) of a mobile working device (700) or an excavator (800).

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