EP-4739457-A2 - EXCHANGEABLE TOOL ELEMENT FOR GRINDING DISC UNIT OF A LATERAL SURFACE GRINDING MACHINE AND GRINDING DISC UNIT

Abstract

An exchangeable tool segment (500) for use in a grinding disc unit of a lateral surface grinding machine has a cutting means support (510) which has mounting structures for fastening the cutting means support in a mounting region provided at the circumferential region of the main body of the grinding disc unit. The main body has, on its circumference, many mounting regions each for mounting one tool segment. On a cutting layer side (515), the cutting means support has, in the operationally ready state, a cutting layer (520) which forms an abrasive effective surface of the tool segment. The abrasive effective surfaces of the cutting layers are, in an operationally ready state of the cutting disc unit, arranged in a side surface of the cutting disc unit within an annular effective region with a radial distance to the disc rotational axis, said side surface being oriented perpendicularly to the disc rotational axis. The cutting means support (510) defines a longitudinal direction (L), a width direction (B) perpendicular thereto and a height direction (H) perpendicular to the longitudinal direction and the width direction, and can be mounted on the main support such that, in the mounted state, the longitudinal direction (L) is oriented tangentially to the disc rotational axis, the width direction is oriented substantially in the radial direction and the height direction is oriented parallel to the disc rotational axis. The cutting means support furthermore has a bottom side (512), an outer side (513), an inner side (514) opposite thereto in the width direction (B) and a cutting layer side (515) opposite the bottom side in the height direction and end faces oriented transverse to the longitudinal direction. In the region of the end faces, a bevel is in each case formed such that the cutting means support has, in the section along a sectional plane oriented perpendicular to the height direction between the bevels, a trapezoid shape such that the cutting means support is longer on the inner side (514) than on the outer side.

Inventors

• FINK, MATTHIAS
• Neumann, Nick
• Duda, Sebastian
• Dzivenko, Dmytro
• KRANICHSFELD, Florian
• WITT, THOMAS

Assignees

• Elgan-Diamantwerkzeuge GmbH & Co. Kg

Dates

Publication Date

20260513

Application Date

20240705

Claims (20)

1. 1. Replaceable tool segment (500, 600) for use on a grinding wheel unit of a side face grinding machine, wherein the grinding wheel unit has a base body (410) which defines a wheel rotation axis (402) and is or can be mounted on a tool spindle (136-1, 136-2) in such a way that the wheel rotation axis (402) runs coaxially to the spindle axis; wherein the base body (410) has, in a peripheral region (412), a plurality of mounting regions (420) arranged offset from one another in the circumferential direction of the base body, with fastening devices for fastening one replaceable tool segment (500, 600) each to the base body (410); wherein the tool segment (500, 600) has a cutting means carrier (510) with mounting structures for fastening the cutting means carrier in one of the mounting areas and on a cutting coating side (515) in the operational state a cutting coating (520) which forms an abrasive effective surface of the tool segment, wherein the abrasive effective surfaces of the cutting coatings are arranged in an operational state of the grinding wheel unit in a side surface (135-1, 135-2) of the grinding wheel unit oriented perpendicular to the wheel rotation axis within an annular effective region (430) with a radial distance from the wheel rotation axis (402); characterized in that the cutting means carrier (510, 610) (i) defines a longitudinal direction (L), a width direction (B) perpendicular thereto and a height direction (H) perpendicular to the longitudinal direction and the width direction and can be mounted on the base support in such a way that in the mounted state the longitudinal direction (L) is tangential to the disk rotation axis (402), the width direction is oriented essentially in the radial direction and the height direction is parallel to the disk rotation axis, (ii) has a bottom side (512), an outer side (513), an inner side (514) opposite thereto in the width direction (B) and a cutting surface side (515) opposite the bottom side in the height direction as well as end faces oriented transversely to the longitudinal direction; and (iii) in the region of the end faces each has a bevel which is designed such that the cutting means carrier has a trapezoidal shape in section along a cutting plane oriented perpendicular to the height direction between the bevels in such a way that the cutting means carrier is longer on the inside than on the outside.
2. 2. Tool segment according to claim 1, characterized in that the cutting means carrier is configured for mounting on a mounting area (420) on the base body of the grinding wheel, wherein the mounting area has a receiving device (440) with stop surfaces (442, 444) for positionally defined receiving of a tool segment (500, 600) and a quick-clamping device (470) which is designed in the manner of a dovetail clamping device which comprises dovetail flanks which delimit a dovetail groove which has a radially inner groove bottom surface and narrows radially outwards.
3. 3. Tool segment according to claim 1 or 2, characterized in that the cutting means carrier has a shape deviating from a cuboid shape, preferably at least approximately plate-shaped, wherein the underside (512) is flat and oriented perpendicular to the height direction (H), the inner side (514) is flat and aligned parallel to the height direction (H) and to the longitudinal direction (L) and the bevels on the end faces form flat inclined surfaces which run away from each other from the outside to the inside.
4. 4. Tool segment according to claim 3, characterized in that the inclined surfaces enclose an acute angle with a plane oriented perpendicular to the longitudinal direction (L).
5. 5. Tool segment according to one of the preceding claims, characterized in that a length of the cutting means carrier measured in the longitudinal direction L is several times greater than the width measured perpendicularly thereto in the width direction B, wherein preferably a ratio between length and width is in the range of 3:1 and 6:1 and/or that a height measured in the height direction H is greater than the width and smaller than the length, wherein the height preferably corresponds to three to five times the width.
6. 6. Tool segment according to one of the preceding claims, characterized in that the tool segment (600) has a cutting means carrier (610) which has a greater width (BWW) in a section on the cutting coating side than in an end section opposite in the vertical direction near the underside, wherein the cutting means carrier has a projection (612) on the outside towards the cutting coating side such that when the tool segment is attached to the base body of the grinding wheel unit, the latter has an external effective region on the abrasive side surface which extends outwards in the radial direction such that an outer radius of the effective region is larger than the outer radius of the base body.
7. 7. Tool segment according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that the cutting means carrier (510) defines a longitudinal direction (L), a width direction (B) perpendicular thereto and a height direction (H) perpendicular to the longitudinal direction and the width direction and can be mounted on the base carrier in such a way that in the mounted state the longitudinal direction (L) is tangential to the disk rotation axis (402), the width direction is oriented substantially in the radial direction and the height direction is parallel to the disk rotation axis, and that the cutting means carrier (510) is designed on the cutting coating side (515) in such a way that the tool segment in the operational state has a segmented cutting coating (520) which comprises at least two cutting material bodies (522) arranged at a mutual distance from one another.
8. 8. Tool segment according to one of the preceding claims, characterized in that the cutting coating (520) has three, four, five, six or more cutting material bodies (522) and/or that the cutting means carrier has three, four, five, six or more receptacles for cutting material bodies (522) on the cutting coating side.
9. 9. Tool segment according to one of the preceding claims, characterized in that the cutting material bodies (522) each have a narrow, preferably rectangular, active surface (525) which is delimited by two longitudinal edges running parallel or almost parallel to one another in the longitudinal direction of the cutting material body and transverse edges running transversely to the longitudinal edges, wherein a length LW of the active surface measured parallel to the longitudinal edges between the transverse edges is several times greater than a width BW of the active surface measured perpendicular to the longitudinal edges, wherein preferably an aspect ratio between the length LW and the width BW is at least 3:1 and/or is in the range from 3:1 to 6:1.
10. 10. Tool segment according to one of the preceding claims, characterized in that the tool segment (500, 600) in the ready-to-use assembled state has at least one cutting material body (525) which, in the ready-to-use assembled state of the tool segment, is oriented obliquely to the width direction (B) and obliquely to the longitudinal direction of the cutting means carrier in such a way that the longitudinal direction of the effective surface with the tool segment mounted on the base body within the annular effective area (430) of the grinding wheel unit is neither tangential nor radial, but obliquely to these two directions,
11. 11. Tool segment according to one of the preceding claims, characterized in that a longitudinal direction (LS) of an obliquely oriented cutting material body (522) forms an acute angle (SW) of a maximum of 45° with the width direction of the cutting means carrier, wherein the angle is preferably in the range of 15° to 40°, in particular approximately 30°.
12. 12. Tool segment according to one of the preceding claims, characterized in that the cutting means carrier (510) has on the cutting coating side several, in particular at least three, preferably five, receiving grooves (516) with a rectangular cross-section and a width which is dimensioned such that a cutting strip (530) can be inserted into a receiving groove with a precise fit and little lateral play and can be fixed there, in particular by gluing.
13. 13. Tool segment according to claim 12, characterized in that the receiving grooves (516) are arranged at equal distances from each other, preferably a The distance measured in the width direction corresponds approximately to the width of the receiving grooves.
14. 14. Tool segment according to claim 12 or 13, characterized in that a cutting strip (530) is inserted into each of the receiving grooves (516) or that one or more receiving grooves remain free.
15. 15. Tool segment according to claim 12, 13 or 14, characterized in that the Receiving grooves (516) are oriented obliquely to the longitudinal direction L of the cutting means carrier and obliquely to the width direction B of the cutting means carrier, wherein preferably an acute angle (SW) between the width direction B of the cutting means carrier and the longitudinal direction LS of the cutting strips (530) is in the range of 20° to 40°, in particular at approximately 30°
16. 16. Grinding wheel unit (400) for use in a side face grinding machine (100) having at least one tool spindle (132-1, 132-2) which can be driven in rotation about a spindle axis (136-1, 136-2) by means of a spindle drive (134-1, 134-2), comprising: a base body (410) which defines a wheel rotation axis (402) and is mountable or mounted on the tool spindle (136-1, 136-2) such that the wheel rotation axis (402) is coaxial with the spindle axis; wherein the base body (410) has, in a radially outer peripheral region (412), a plurality of mounting regions (420) arranged offset from one another in the peripheral direction of the base body, with fastening devices for fastening a respective exchangeable tool segment (500, 600) to the base body (410); wherein a tool segment (500, 600) has a cutting means carrier (510) with mounting structures for fastening the cutting means carrier in one of the mounting areas and a cutting coating (520) on a cutting coating side (515), which forms an abrasive active surface of the tool segment, wherein the abrasive active surfaces of the cutting coatings are arranged in a side surface (135-1, 135-2) of the grinding wheel unit oriented perpendicular to the wheel rotation axis within a radially outer annular active region (430) at a radial distance from the wheel rotation axis (402), so that the grinding wheel unit is designed in the manner of a cup wheel segmented in the circumferential direction, characterized in that an exchangeable tool segment (500, 600) according to one of claims 1 to 15 is mounted on at least one of the mounting areas, preferably on several or all of the mounting areas.
17. 17. Grinding wheel unit (400) according to claim 16, characterized in that a mounting area (420) has a receiving device (440) with stop surfaces (442, 444) for the position-defined receiving of a tool segment (500, 600) and a Quick-clamping device (470) which can be switched between an open configuration and a clamping configuration, wherein in the open configuration a tool segment (500, 600) can be inserted into the receiving device (440) or removed from the receiving device and in the clamping configuration the tool segment can be pressed against the stop surfaces and fixed in a predetermined position on the base body (410), wherein the quick-clamping device (470) is designed in the manner of a dovetail clamping device which comprises dovetail flanks which delimit a dovetail groove which has a radially inner groove bottom surface and narrows radially outwards.
18. 18. Grinding wheel unit according to the preamble of claim 16, in particular according to one of claims 16 or 17, characterized by at least one of the following features: a number of tool segments (500, 600) is in the range from 10 to 20; the annular effective region (430) has a width measured in the radial direction (R) which is 2% to 20%, in particular 5% to 10%, of the radial extension of the grinding wheel unit between the wheel rotation axis (402) and an outer edge of the grinding wheel unit; the annular effective region (430) has a width measured in the radial direction (R) which is 5% to 20% of the radius of the base body; the grinding wheel unit has an outer effective region on the abrasive side surface which extends outwards in the radial direction such that the outer radius of the effective region is larger than the outer radius of the base body.
19. 19. Grinding wheel unit according to one of claims 16 to 18, characterized in that a receiving device (440) comprises a recess in the base body (410), wherein the recess is open to the outside in the radial direction (R) and has at least one radial stop surface (442) in the opposite direction and is open to the side surface in the axial direction and has at least one axial stop surface (444) in the opposite direction, and that a quick-clamping device is provided which can be switched between an open configuration and a clamping configuration, wherein in the open configuration a tool segment can be inserted into the receiving device or removed from the receiving device and in the clamping configuration the tool segment can be pressed against the stop surfaces and fixed in a predetermined position on the base body, wherein preferably the quick-clamping device can be switched between the open configuration for inserting or removing a tool segment and the clamping configuration for securing an inserted tool segment by actuating a single actuating element.
20. 20. Side face grinding machine (100) for grinding a substantially flat workpiece surface on a workpiece section (WA) of a workpiece (WS1, WS2), in particular a double-side face grinding machine for grinding workpiece surfaces of a circular brake section of a brake disk, comprising a grinding unit (121) with at least one tool spindle (132-1, 132-2) which carries a grinding disk (130-1, 130-2) with an abrasive side surface (135-1, 135-2), wherein the grinding disk can be rotated about the associated rotation axis (136-1, 136-2) by means of an associated rotation drive (134-1, 134-2) and can be fed parallel to the associated rotation axis by means of a feed drive (131-1, 131-2), at least one workpiece spindle (154) with a workpiece holder (155) for the rotationally fixed reception of the workpiece (WS1, WS2), wherein the workpiece holder is rotatable by means of a rotary drive (157) about a rotation axis (156) running parallel or obliquely to the rotation axis of the grinding wheel and is arranged in a working position at least during a phase of a grinding operation such that the workpiece section (WA) of the received workpiece comes into contact with the abrasive side surface, characterized in that the grinding wheel is designed as a grinding wheel unit (400) according to one of claims 16 to 19. -

Description

Interchangeable tool segment for grinding wheel unit of a side face grinding machine and grinding wheel unit FIELD OF APPLICATION AND STATE OF THE ART The invention relates to an exchangeable tool segment for use on a grinding wheel unit of a side face grinding machine and to a grinding wheel unit equipped with a plurality of such tool segments. The side face grinding machine can in particular be a double side face grinding machine. Double-side face grinding machines can be used, for example, for the simultaneous grinding of essentially plane-parallel, circular workpiece surfaces on a disk-shaped workpiece section of a workpiece. One possible area of application is the grinding of surfaces of a circular brake section of a brake disk, in particular a coated brake disk. Upcoming tightening of the regulations on fine particle emissions from motor vehicles means that future brake discs for motor vehicles will have to be designed in such a way that fewer fine particles are released during braking. One approach to this is to coat the brake discs or their surface sections intended as friction surfaces with a thin functional layer made of more wear-resistant material. In a coated brake disc, the surfaces of the annular braking section each have a functional layer that is rotationally symmetrical with respect to the axis of rotation, the free surface of which is designed as the friction surface of the brake disc. The manufacturing process of a coated brake disc comprises one or more coating operations for coating the surfaces of the brake section of the brake disc with a functional layer that is intended to have a wear-reducing function due to the relatively high mechanical hardness of individual carbides. Alternatively or additionally, a corrosion-inhibiting effect can also be present. Such functional layers often consist essentially of metal; they can have a single layer or several layers with different properties. Such coatings can be applied, for example, by flame spraying or laser cladding. Typical layer thicknesses can be in the range between 50 pm and 350 pm, for example. The coatings are usually applied on both sides. The documents EP 2 746 613 A2 and WO 2019/021161 A1 disclose examples of coated brake discs. The carbides of the functional layers are usually mechanically relatively hard and the layers are relatively rough on the surface after coating. A subsequent grinding process is intended to produce a sufficiently flat surface on the coating that is optimized for the braking function. The specifications for friction surfaces of a brake disc can, for example, be such that a mean roughness Ra determined in accordance with DIN EN ISO 4288 should be in the range of 1 m to 3 pm - 3.2 pm and a flatness deviation should be no more than 20 pm (cf. WO 2021/224308 A). Double-sided face grinding machines are often used for grinding brake discs. The document JP2011156606 A2 describes a double-sided surface grinding machine with grinding wheels suitable for grinding both sides of brake discs, which is designed as cup wheels segmented in the circumferential direction with individual grinding segments. The document DE 20 2023 100 514 U1 describes, among other things, a double-sided surface grinding machine suitable for grinding brake discs on both sides, which Position data determination systems are included which determine, on the one hand, the axial position of the workpiece surface and, on the other hand, the axial position of the abrasive side surface of a grinding wheel facing the workpiece surface in relation to the same reference coordinate system. A control unit of the grinding machine can control at least one grinding parameter in at least one phase of the grinding operation depending on the workpiece position data and/or the tool position data. This gives a user a tool for optimizing "his" grinding process. The grinding wheels are designed as cup wheels segmented in the circumferential direction with individually replaceable and individually adjustable strip-shaped grinding segments. The document EP 4 147 821 A1 discloses a device, designed in the manner of a double-side surface grinding machine, for machining a hard-coated workpiece surface of a rotationally symmetrical workpiece, comprising a workpiece drive device for generating a rotational movement about a workpiece rotation axis, at least one grinding wheel drive device for generating a rotational movement about a grinding wheel rotation axis, at least one feed device for bringing the grinding wheel into contact with the workpiece surface and at least one adjustment device for adjusting the grinding wheel rotation axis and the workpiece rotation axis to one another, so that the grinding wheel rotation axis and the workpiece piece rotation axis are not parallel. The grinding wheels of the embodiment are shown as segmented cup wheels. TASK AND SOLUTION The invention is based on the object of providing an exchangeable tool segment for use on a grinding w