SK185999A3 - Rotating disk for machining material surfaces - Google Patents

Abstract

The invention relates to a rotating disk (2) for machining material surfaces, comprising a disk-shaped base part (4) which has a central hole (6); a first machining coating (12) which is subjected to wear by abrasion, has a cutting edge of undefined shape and is located on a first circular area (8) of the base part (4) which extends on a first face of the base part (4) around the central hole (6) of same; and a second machining coating (14) which is subjected to wear by abrasion, has a cutting edge of undefined shaped and is located on a second circular area (10) of the base part (4) which area extends on the second face, facing away from the first face of the base part, and around the central hole (6) of same. According to the invention the base part is provided with a recess for a spacer (22) which maintains a distance in relation to a tool housing.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary wheel for machining surface surfaces of a material comprising a disc base body having a central hole, a first material treatment facing exposed to abrasion with a geometrically indeterminate edge on the first annular zone of the base body formed on the first face of the base body around its central hole. a second material treatment clad exposed to abrasion with a geometrically indeterminate edge on the second annular zone of the base body formed on the second front side of the base body around its central opening, wherein the first material treatment cladding comprises first processing lamellae, in particular first abrasive lamellae, extending in each case in a radial direction and with a mutual fan-like interference in the circumferential direction on the first annular zone of the base body and / or the second material treatment cladding comprises second processing slats, in particular abrasive slats, each extending in a radial direction and with a mutual fan-like interference in the circumferential direction on the second annular zone of the base body.

BACKGROUND OF THE INVENTION

The closest prior art are working rotary disks equipped with working claddings for the treatment of material surfaces, in general not only abrasive cladding and coatings of abrasive material, but also polishing coatings, optionally arranged such that the abrasive cladding or coating is formed in particular on the first annular zone and the polishing lining or coating is adhered to the second annular zone of the base body.

The two annular zones covered by the machining material can also be coated with materials with different working characteristics, for example with different grinding characteristics, as for example disclosed in DE 38 11 584 A).

In many applications, the use of the same cladding on both annular regions or on both front faces of the base body should simply allow a doubling of the service life, measured up to the point where the cladding is fully worn on both sides compared to conventional cladding and base body coatings. applied on only one face. Since the manufacture of the base body is generally more expensive than the manufacture of an abrasive coating or cladding, it is possible to substantially reduce production and storage costs by alternately using a material treatment coating on both front surfaces of the base body. Such an arrangement also makes it possible to work with alternating compressive and tensile stresses of the rotary disk (e.g. DE 297 11 310 U).

For comparison, for example, a rotary disc according to DE 337 145 C lined with abrasive materials can be used on both faces, but in which the disc base body is not formed by the rotary disc b, but the central bore is used as a bearing for the drive shaft.

In particular, the invention relates in particular to a rotary disc in which the first material treatment coating or cladding is formed by first processing slats, in particular abrasive slats, which are arranged in a radial direction and at the same time partially overlap in a circumferential direction on the first annular zone of the base and the second material treatment coating is formed by second processing lamellae, in particular abrasive lamellas, which are arranged in a radial direction and at the same time partially overlap in the circumferential direction on the second annular zone of the base body.

Such special rotary disks are already known, for example, in an embodiment with a two-sided arrangement of fan-shaped, partially overlapping grinding lamellas of JP-A Sho 63-168055, DE-U G 90 02 384.6 and 298 23 200.6 and of partially published EP 0 911 116 A, from which part of the claims has been disclosed.

I

In the case of rotary wheels of this type, lined with abrasive or polishing materials on their two faces, it must be ensured that, when operating a grinding device, such as an angle hand grinder, working surfaces, in particular the grinding surfaces of the rotating wheel and the instrument surface, do not come into contact with each other. , such as its cover. To avoid this, in the case described in DE 337 145 C the entire inactive rear side of the rotary disk b, which in this case is not provided with a central opening, is surrounded by a holding device a, which in turn is connected to the grinding drive shaft. In the known solution according to EP-A-0 911 116, an arrangement in which the base body is still provided with a central bore for receiving the drive shaft is provided with a protective cover which is an integral part of both the rotary disk and the rotary disk retaining means on the drive shaft. and which completely overlaps the side of the rotary disk facing the grinding machine.

However, both of these latter known embodiments are costly and change the conventional design and structure of a rotary disk with a two-sided material treatment coating and require the unconventional formation of a disk bearing on the drive shaft to prevent unwanted alternating effects of the material on the non-rotating material. or polishing machine.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent unwanted contact between the working surface of the rotary disk facing the grinding or polishing apparatus and the housing or other part of the grinding or polishing machine while maintaining the conventional structure and construction of the rotary disk. .

SUMMARY OF THE INVENTION

This object is achieved by the rotary disc according to the invention, the nature of which is determined by the features contained in the characterizing part of claim 1, and is characterized in that the base body is provided with a spacer for the spacer with respect to the tool housing.

According to this basic embodiment of the invention and the further concretization determined by the features contained in the dependent claims 2 to 6, simply and differently from the embodiment according to EP-A-0 911 116, while maintaining the complete or at least substantially retained basic design of the rotary disk, The surface of the material facing the housing of the working apparatus does not come into undesirable contact with the second coating intended to treat the surface of the material, which is the working surface on the opposite side of the face. In this embodiment, it is even possible to use or at least partially utilize, together with other modifications, a central hole for receiving the drive shaft and also for receiving the spacer. The funnel-shaped or conical insertion chamfers of both ends of the central opening can assist in the rapid exchange between the first and second coatings for machining the surface of the material during the working process.

It is particularly advantageous to provide a spacer element for providing the spacer function in the form of an additional part according to claim 7.

In a otherwise conventional rotary disk design with a central bore in the base body, the central bore of the base body does not in itself serve as a bearing for the rotary disk drive shaft, but this function is performed from the central bore to an accessory part accommodatable in the central bore. The insertion of the complementary part takes place depending on which front side of the rotary disk is to be facing its drive means, i.e. if the first or second side of the rotary disk is to be the side facing the drive means. In the operating position, the complementary part rests on the rotary disc. The axial overhang of the complementary part over the axial longitudinal dimension of the material-processing coating is thus secured on the front facing the drive train, so that no undesirable interaction between the material-processing coating facing the drive train and the drive device itself can occur. The rotary disc thus formed, provided with an additional part, can then be mounted on its conventionally formed bearing, without undesirable interaction of the disc with the grinding or polishing apparatus.

It is possible, for example, to mount the rotary disk or its base body to the drive shaft such that the two parts are connected non-rotatably to the drive shaft. It is then not necessary to mount the complementary part in the center hole of the base body non-rotatably. However, it may be appropriate if the complementary part is held in the central opening of the base body by a positive engagement, in particular by a press fit.

The simplest kind of engagement of the complementary part in the central bore of the base body is the mounting with the housing part of the complementary part, wherein the central bore of the housing attachment then forms a bearing for the rotary disk drive shaft. The housing part may simply be formed by an ordinary hollow cylinder. Preferably, the depth of engagement of the housing part corresponds to the axial length of the opening in the base body. In another preferred embodiment of the invention, the housing surface of the housing part may be profiled for positive engagement with the base body.

In addition, the complementary part must, on the one hand, form a stop part on the base body and on the other hand form an axially overlapping element having a length dimension in the axial direction greater than the axial dimension and reach of a coating intended for machining material on the rotary disk on the same side of the base body. This dual function can be easily accomplished by means of a flange.

It is sufficient if the complementary part consists only of the flange and its sleeve extension. In this connection, it is advantageous to provide a slanted or rounded transition surface between the flange and the sleeve extension which, in a preferred embodiment, cooperates with the complementary transition surface in the transition from the central opening of the base body to its end face.

The arrangement of the complementary part with the function according to the invention is essentially possible in any known construction of the base body. The basic body is in the simplest embodiment formed by a flat disc with an opening. The coating intended for machining the surface of the material can be formed axially symmetrically on both sides of the roll. If, in the known embodiment, abrasive lamellas that are overlapping on both sides are formed on both sides, these lamellas can also be oriented in opposite directions on both sides in a known embodiment.

The base body and / or the complementary part may generally be made of plastic, but other materials such as metal may also be considered. Both plastic and other materials, such as metal, offer the possibility of manufacturing both the base body and the complementary part in the form of an injection molded element, with only one of the parts needing to be injection molded.

For this manufacturing technology, claims 16 and 17 preferably describe the physical design of the housing extension of the complementary part and of its flange.

According to claim 18, in a preferred embodiment of the invention, the base body can be joined with a coating intended to treat the surface of the material in a conventional manner. Claim 19 emphasizes that the construction of the complementary part according to the invention is also suitable for high-performance rotary disks. Ensuring a working peripheral speed of around 80 m / sec means that a minimum tear resistance to a peripheral speed of 150 m / sec must be ensured in terms of occupational safety. This corresponds to a conventional rotary disk diameter of 115 mm of about 24,900 rpm. This is a very demanding requirement.

The complementary part according to the invention has heretofore been elucidated in its function of spacer spacer with respect to the grinding device cover. This function can be realized by forming a flange in the form defined by the features of claim 20. In a further preferred embodiment of the invention according to claims 21 to 23, there is also a protective function against contact of the face surface of the coating intended for surface treatment. a surface area formed by a coating intended for machining the surface of the material and, optionally, a surface area formed by the base body, of a rotary disk / ca.

In conjunction with the spacer function and possibly the protective function, and in some cases alone, the complementary part can fulfill another function: it is possible to produce the base body always with the same central hole and to produce a corresponding complementary part having different diameters of its central hole. In this embodiment, the diameters of the central bore of the accessory part can be adapted to different diameters of the drive shafts and thus adapted to the grinders currently on the market using the same rotary disk designs using these adapter parts.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated in more detail by way of example embodiments shown in the drawings, in which: FIG. 1 is an axonometric view of a rotating wheel for surface treatment of materials, FIG. .2 is a plan view of the front side of the base disk of the rotating disk; FIG. 2a is a cross-sectional view taken along line A-A in FIG. 2, FIG. 2c detail C of FIG. 2 showing the inner contour of the central opening of the base body, FIG. 3a, 3b and 3c are views from the rear of the complementary part, i.e. from the side of its housing part, obliquely from the rear and obliquely from the front after omitting the possible rear covering of the complementary part flange; 3d and 3e are side and front views of the complementary part of FIG. 3a, 3b and 3c, FIG. 3f is a cross-sectional view taken along line F-F of FIG. 3e, FIG. 4a to 4c show an axonometric view and also two axial cross-sections oriented in opposite directions with one variant of the exemplary embodiment of the complementary part according to FIG. 3a to 3e, wherein in FIG. 4b is a sectional view taken along a plane passing between the radial partitions or between the walls of the inner chambers of the annular flange, and FIG. 4c is a cross-sectional view of this partition.

DETAILED DESCRIPTION OF THE INVENTION

The rotary disc 2 of FIG. 1 has a disc-shaped base body 4 with a central bore 6, on which both front sides around the central bore 6 up to the edge of the base body 4 or further, a first annular zone 8 and a second annular zone 10 are formed which are lined with first abrasive lamellas 12 and / or second abrasive lamellas 14 forming coatings intended for working material having a substantially constant thickness and fastened with adhesive. In this case, the abrasive lamellas 12, 14 extend in a radial direction and overlap somewhat in a fan-shaped manner and overlap each other in the circumferential direction, the orientation of the overlaps in the first annular zone 8 opposite the orientation of the lamellae in the second annular zone 10. The grinding lamellae 12, 14, when rotating the rotary disk 2, are always pressed against each other in the overlapping areas during the working operations and cannot be separated from each other by centrifugal forces. To this extent, the rotating disc 2 corresponds to a known construction according to JP-63-168055-A.

The base body 4 is shown in FIG. 2 to 2c formed by an axially symmetrical, planar and solid disc with a center hole having a constant thickness and made of plastic, in particular as an injection molding with an injection point 16 shown on the inner contour of the center hole 6 in Figs. 2a and 2c. A conical recessing transition region 18 is formed at the passage of the central opening 6 into the planar faces of the base body 4, inclined at an acute angle and a plane of symmetry of the rotary disk 2. Concentrically extending annular grooves 20 with a cup-shaped shape are formed on both annular zones. their profiles (Fig. 2b). The abrasive lamellae 12, 14 are rigidly connected to each other and also to the base body 4 by adhesive, the annular grooves 20 contributing to the firm holding of the parts to be joined.

The entire rotary disc 2 has an axially symmetrical construction, except for the opposite orientation of the grinding lamellae 12, 14 and, optionally, the location of the inflow point including the two-sided material cladding with the grinding lamellae 12, 14.

In the central bore 6 of the base body 4, an additional part 22 can be fitted from one or the other front side, which is explained in more detail by way of the embodiment shown in FIG. 3a to 3f.

The one-piece complementary part 22 consists only of two elements, one of which is formed by an annular flange 24 and one by a sleeve extension 26 of an annular flange 24. At the transition to the sleeve extension 26 which is cylindrical in its end region, a conical annular a rim 28 that is complementary to the transition region 18. Alternatively or additionally, the front end of the sleeve extension 26 may be conically tapered in such a manner that the conical taper fits with the conical transition region after insertion of the complementary part 22 into the central opening 6 of the base body 4. 18 on the opposite front side of the base body 4 into a common annular to conical surface.

The annular flange 24 has an axial length R which is greater than the axial reach of the grinding lamellae 12, 14 on the same front side of the base body 4 on the side of the base body 4, on which the complementary part 22 is mounted in the central opening 6 of the base body 4.

The annular surface on the rear face of the annular flange 24 facing the sleeve extension 26, optionally together with the conical annular rim 28, is provided with an annular abutment surface 30 which has an unladen facing face of the base body 4 between the first annular zone 8 or the second. the annular zone 10 and the central aperture 6 is not covered with a coating of machining material, and in this stop function with the stop surface 30 on the accessory part 22, a transition zone 18 on the base body 4 may be included.

Also, the complementary part 22 is formed by an injection molded in a plastic mold. The annular portion extending outwardly through the sleeve extension 26 is hollow and is provided with a plurality of inner chambers 34 disposed along its circumference, which are equally formed and are circumscribed on the radially outer and radially inner side by a cylindrical wall 38 and separated by radially extending baffles. 40. The front face 42 of the annular member 32 is in this case formed in a closed mold, while in FIG. 3a and FIG. 3b and also FIG. 3f, the side of the sleeve extender 26 is shown in open form, but may preferably be closed by a circular disc, preferably also made of plastic and fixed by welding, gluing and the like of the cap.

On the one hand, the complementary part 22 is provided with a central bore 44 extending in the form of a through bore extending through the annular flange 24 and a coaxial cylindrical wall surface 46 extending through the sleeve extension 26 of the annular flange 24. The central bore 44 in the ancillary part serves to receive the drive shaft. 2, when the sleeve extension 26 of the complementary part 22 is inserted into the central opening 4 on the base body 4, until the abutment surface 30 on the annular flange 24 in the region of the base body 4 is not covered by a working covering, e.g.

The interaction of the central bore 44 with the drive shaft (not shown), while attaining material savings on the complementary part 22, is improved by providing the cylindrical wall surface 46 of the central bore 44 with an inner surface peripheral toothing 48 extending over most of the thickness of the annular flange 24.

In a modified embodiment of the complementary part 22, in an otherwise identical construction, the outer zone 62 is flush with the end face of the sleeve 26 away from the rotating disc 2. The radial outer zone 62 extends in the radial direction of the material grinding coating and its outer edge into a cylindrical outer collar overlying the coating for processing the material circumferentially. Thus, the radially outer zone 62 and the overlap 64 form a protective wall against contact with the material treatment coating facing the tool. Since the sleeve extension 26 abuts the base body 4, however, the radial outer zone 62 (and the overlap 64) should be spaced from the material treatment coating, the annular flange 24 on the side facing the rotary disk 2 is so radially graduated that on the radially outer side of the annular step 66, the radially outer flange zone 62 is thin in the axial direction and radially within the annular step 66 of the annular flange 24 has a greater thickness in the axial direction.

Claims (24)

PATENT CLAIMS A rotary wheel (2) for surface treatment of a material, comprising a disc base body (4) equipped with a central bore (6), a first material treatment cladding (12) subjected to abrasion, with a geometrically indeterminate edge in the first annular zone (8) a base body (4) formed on a first front side of the base body (4) around its central opening (6), a second material treatment cladding (14) subjected to abrasion, with a geometrically indeterminate edge on the second annular zone (10) side the first body facing (4) formed on the second face around its central opening (6), the material processing comprising first processing lamellae, in particular first abrasive lamellas (12), for running in a radial direction and with each other a fan-shaped overlap in the circumferential direction on the first annular zone (10) of the base body (4) and / or the second material treatment cladding comprising second processing lamellae, in particular abrasive lamellas (14), each running in a radial direction and with a mutual fan-like interference in the circumferential direction on the second annular zone (10) of the base body (4), characterized in that the base body (4) is equipped by mounting (6) for the spacer (22) against the tool housing. Rotary disc according to claim 1, characterized in that the bearing (6) of the base body (4) is designed and arranged such that the axial depth as well as the radial length of the area covered by the first and second material surface cladding ensures placement of the coatings outside bearing elements (6). Rotary disc according to claim 1 or 2, characterized in that the bearing is formed by an opening (6) in the base body (4). Rotary disc according to claim 3, characterized in that the bearing is formed by a central opening (6) in the base body (4). The rotary disc according to claim 3 or 4, characterized in that the opening (6) extends at both its ends in a conical or boss-like manner (transition region 18) into or extends from the base body (4). Rotary disc according to claims 3 to 5, characterized in that the bore (6) is provided with an internal thread opposite to the direction of rotation of the rotary disc (2). Rotary disc according to Claims 4 to 6, characterized in that it is provided with an additional part (22), which can be mounted optionally from one side or the other into the central bore (6) of the base body (4) abutting in the seated position to the stop (30). ) restricting the mounting movement on the rotary disk (2) and formed with a central bore (44) adapted to receive the rotary disk drive shaft (2) and on the side of the base body (4) from which the complementary part (22) is inserted into the bore (6) of the base body (4), the complementary part (22) has an axial overlap with an axial length (R) that is greater than the axial reach of the cladding (12, 14) for machining the surface of the rotary disk material (2) on the same side of the base body (4). A rotary disc according to claim 7, characterized in that the complementary part (22) fits in the shape of the opening (6) of the base body (4) and is accommodated therein in particular by a press fit. Rotary disc according to claim 7 or 8, characterized in that the complementary part (22) is provided with a sleeve extension (26) extending into the opening (6) of the base body (4). A rotary disc according to claims 7 to 9, characterized in that the complementary part (22) is provided with an annular flange (24) abutting the base body (4) and forming an axial interference. The rotary disc according to claim 10 and claim 8 or 9, characterized in that the complementary part (22) consists only of the flange (24) and its housing extension (26). Rotary disc according to claims 1 to 11, characterized in that the two-sided working material claddings (12, 14) have an axially symmetrical arrangement and / or the base body (4) has an axially symmetrical configuration. Rotary disc according to claims 1 to 12, characterized in that the base body (4) is formed by a planar disc with an opening. Rotary disc according to claims 1 to 13, characterized in that the base body (4) and / or the complementary part (22) consist of plastic. Rotary disc according to one of Claims 1 to 14, characterized in that the base body (4) and / or the complementary part (22) are each formed by injection molded parts. Rotary disc according to claims 9 to 15, characterized in that the sleeve extension (26) has a toothed inner surface (48). The rotary disc according to claims 10 and 15, characterized in that the flange (24) is hollow and comprises a plurality of inner chambers (34) distributed around its periphery. Rotary disc according to one of Claims 1 to 17, characterized in that the first and / or the second annular zone (8, 10) is provided, in particular, with a concentric groove (20) of the surface for receiving a binder, in particular adhesive, 14) for surface treatment of the material. Rotary disc according to claims 1 to 18, characterized in that it is designed for a peripheral speed of at least 80 m / sec. A rotary disc according to claims 10 to 19, characterized in that the flange (24) of the complementary part (22) has a radial extent which is smaller than the area of the material working cladding extending inwardly in the radial direction. Rotary disc according to one of Claims 10 to 19, characterized in that the flange (24) has a radial outer zone (62) extending radially beyond the material processing coating. The rotary disc according to claim 21, characterized in that the radially outer region (62) overlaps the material cladding or coating. The rotary disc according to claim 22, characterized in that the radially outer region (62) extends radially through the material working cladding and carries at least partially covering the outer edge of the cladding or material working cladding and optionally the base body (4). Rotary disc according to claims 20 to 23, characterized in that the flange (24) is graduated in the radial direction on the side facing the rotary disc (2) so that the radial inner region of the base body (4) comes into contact and the radially outer region extends above the cladding or material dressing coating. rotary disc base body center hole first annular zone second annular zone first grinding disc second grinding disc inlet point transition area annular groove accessory part annular flange sleeve extension annular rim stop surface annular part inner chamber cylindrical wall I bulkhead front face annular flange, central hole bushing extension circumferential toothing outer zone overlap annular stage