KR102341025B1 - Pressing device - Google Patents

Abstract

The present invention presses the finishing band on the peripheral surfaces 38 of the substantially cylindrical workpiece portions 36 in a finishing process, wherein the finishing band is pressed against the peripheral surface 38 by a pressing force through the engagement angle portion 46. A pressing device (10) comprising a pressure band (48) for pressing in such a way as to be pressed against the two parts of a support member (26) comprising at least one axis of rotation (28) Supported by support bearings 52 , the support bearings are disposed on both sides of the engagement angle portion 46 .

Description

pressing device {PRESSING DEVICE}

[0001] The present invention is a pressure band for pressing a finishing band to the circumferential surfaces of substantially cylindrical workpiece portions in a finishing process in such a way that the finishing band is pressed against the circumferential surface by a pressing force through the bite angle portion. It relates to a pressing device comprising a.

[0002] From EP 2 212 058 B1, a pressing device is known in which a pressure band is fixed to two bearings spaced apart from each other of a support member, the front side of the pressure band being provided with anti-skid means, the anti-slip means comprising: Prevent the finishing band from sliding against the pressure band within the bite angle.

[0003] From this, an object forming the basis of the present invention is to provide a pressing device that implements high processing accuracy.

[0004] An object of the present invention is to provide a pressing device in the technical field mentioned at the outset, wherein, according to the invention, a pressure band is supported on two bearing bearings of a support member comprising at least one pivot axis. In this case, the support bearings are disposed on both sides of the engagement angle part.

[0005] The support of the pressure band according to the present invention provides at least one additional degree of freedom for the alignment of the pressure band and the finishing band relative to the workpiece to be machined. Such a degree of freedom leads to an equalization of the pressing forces, especially in connection with the finishing of workpieces with different diameters. In particular, the pressing forces acting on both support bearings can be equalized. That is, the pressing apparatus according to the present invention realizes equalization of pressing forces and prevention of excessively high pressing forces. This ensures that high material removal rates do not adversely affect processing accuracy.

[0006] Preferably, the pressure band is only supported on the support bearings and is not fixed in this area. In this context, it is highly desirable for the pressure band to comprise unsupported free band portions on either side of the support bearings when viewed in the band direction of the pressure band. In this case, a central band portion is provided between the support bearings. This is a band portion that presses the finishing band toward the circumferential surface of the workpiece to be finished through the engagement angle portion. The free band portions arranged externally in relation to the central free band portion allow the pressure band to be fixed spaced apart from the support bearings, in particular to parts provided separately from the support member.

[0007] In one embodiment of the invention, the support bearings are substantially inelastic and are made, for example, of a metallic material.

[0008] In a preferred embodiment, the support bearings are made of an elastically bendable material, in particular of an elastomer. Such bearing bearings may be formed, for example, by pads compressible in the pressing direction and/or by means of a rotational axis or a roller movable about the rotational axis.

[0009] An elastomeric material that is very well suited for support bearings is "Vulkollan" (registered trademark of Bayer AG or its affiliates). This material refers to polyurethane elastomers from Bayer MaterialScience AG (51368 Leverkusen, Germany). These materials are available in the harder so-called "massive" form and the softer so-called "cellular" form. Higher pressing forces can be generated in the use of Massive Vulkoran, resulting in a more stable support effect suitable for very high material removal rates. The use of cellular Vulkoran has a weaker support effect suitable for very high dimensional accuracy.

[0010] An additional degree of freedom for the bearing of the pressure band can be provided if the pressure band is fixed to a holder provided separately from the support member.

[0011] In use of such a holder, it is preferred that the support member is rotatable about at least one axis of rotation relative to the holder.

[0012] The holder may include, for example, a receiving space defined in a U-shape for placement of a support member. In this case, the partial faces of the boundary surface of the U-shaped accommodation space may simultaneously function as guides for the support member movable relative to the holder.

[0013] Very preferably, the holder is connected to or is part of the pressing arm, the pressing arm being rotatable about the pressing arm axis. In this way, the pressing arm of a known pressing device can be used.

[0014] At least one axis of rotation of the support member is, for example, a tilting axis, which in relation to the workpiece to be machined extends in a direction parallel to the axis of rotation of the workpiece. Such a tilting axis enables a very good equalization of the pressing forces during machining of workpieces with different diameters.

[0015] Additionally or alternatively to the tilting axis, at least as an axis of rotation an oscillation axis is provided, the oscillation axis extending in a direction perpendicular to the axis of rotation of the workpiece in relation to the workpiece to be machined. This makes it possible to equalize the pressing forces over the width of the circumferential surface of the workpiece to be finished, wherein the width of the circumferential surface is measured parallel to the axis of rotation of the workpiece.

[0016] The support bearings described below, the formations of the front side and/or the rear side of the pressure band, in particular the friction between the pressure band and the finishing band described below and/or between the pressure band and the support bearings Measures affecting friction are each advantageous in their own right, and can also be used in pressing devices where the support member does not comprise a pivot axis (ie according to claim 1, except for the feature that the support element comprises a pivot axis). pressing device according to).

[0017] In another embodiment of the present invention, the pressure band comprises friction surfaces at the level of the support bearings, the pressure band comprises pressure surfaces between the support bearings in the region of the engagement angle portion, the friction of the pressure band The static friction between the faces and the rear side of the finishing band is greater than the static friction between the pressing surface of the pressure band and the rear side of the finishing band. In this way, the friction between the pressure band and the rear side of the finishing band in a region other than the engagement angle portion can be increased. At the same time, the rear side of the finishing band cooperates with the smooth pressing surface of the pressing band within the area of the engagement angle portion, so that the forces acting on the peripheral surface of the workpiece from the finishing band are equalized, and the peripheral surface of the workpiece is finished with high accuracy can be In particular, the adverse influence that the (locally irregularly) roughened pressing surface may have on the accuracy of the finishing process can be prevented. Preferably, the average roughness depth Rx of the pressing surface is at most 3 micrometers, in particular at most 1 micrometer.

[0018] Relevant measures are known to the person skilled in the art for adjusting the static friction in the region of the friction surfaces and in the region of the pressing surfaces. One of these measures is that the friction surfaces have a higher roughness than the pressure surfaces. For example, metal pressure bands can be used, which metal pressure bands are roughened only in the area of the support bearings and/or contain additional fittings, in particular additional fittings of cut material (eg diamond) material. .

[0019] Additionally or alternatively to this, the support bearings may comprise roughened surfaces or friction coatings, which cooperate with and/or with the rear side of the pressure band in a direction away from the finishing band and/or the rear of the pressure band. The side may include roughened sides or friction coatings.

The pressing apparatus according to the present invention provides a technical effect of realizing high processing accuracy.

[0020] Other features and advantages of the present invention may be seen through the following description of preferred embodiments and illustration of the drawings.
[0021] The drawing is as follows:
1 is a perspective view of an embodiment of a pressing device;
FIG. 2 is a side view of an embodiment of a finishing device comprising the pressing device according to FIG. 1 ;
[0024] Figure 3 is a side view of another embodiment of a finishing apparatus including a pressing apparatus in a pressed state to a work piece having a smaller diameter;
FIG. 4 is a view of the finishing device according to FIG. 3 , in which the pressing device is pressed against a workpiece having a larger diameter;
5 is a perspective view showing another embodiment of the pressing device.
6 is a side view of the support bearing of the pressing device according to FIG. 5 ;
7 is a perspective view showing another embodiment of the pressing device.
8 is a side view of a support bearing according to another embodiment of a pressing device;
9 is a perspective view showing another embodiment of the pressing device.
10 is a longitudinal cross-sectional view of the pressing device according to FIG.
11 is a perspective view showing another embodiment of a finishing device including a pressing device.
12 is a perspective view showing another embodiment of a finishing device including a pressing device.

[0034] One embodiment of a pressing device is shown in FIG. 1 , which is indicated in its entirety by the reference numeral 10 . The pressing device 10 according to FIG. 1 is used for the finishing device according to FIG. 2 , generally denoted by the reference numeral 12 .

The pressing device 10 includes a holder 14 , which is a part of a pressing arm 16 rotatably supported about a pressing arm shaft 18 .

The holder 14 includes a main portion 20 and two holder arms 22 protruding from the main portion 20 . The main part 20 and the holder arms 22 collectively form a U-shaped interface of the receiving space 24 for the placement of the support member 26 .

The support member 26 is connected to the holder 14 using the rotation shaft 28, and is rotatably supported in the holder. To define a basic position of the support member 26 relative to the holder 14 , two springs 30 are provided on either side of the rotation axis 28 , these springs being the main part of the holder 14 . It is disposed between ( 20 ) and the rear side ( 32 ) of the support member ( 26 ).

The support member 26 includes a recess 34 on its front side (not referenced) away from the holder 14 , the recess 34 at least partially receiving the workpiece portion 36 . is the role

[0039] Workpiece portion 36 includes a cylindrical circumferential surface 38, which is, for example, a major bearing or a big end bearing of a crankshaft. When the circumferential surface 38 is the main bearing of the crankshaft, the circumferential surface 38 rotates around the workpiece rotational axis 40 during the finishing process. For this purpose, a known but not shown rotation driving unit is provided. During the finishing of the circumferential surface 38 , the rotational motion of the workpiece overlaps the oscillating motion. This oscillating motion is implied by double arrow 42 in FIG. 1 ; The workpiece portion 36 of the workpiece then reciprocates parallel to the axis of rotation 40 of the workpiece portion 36 relative to the finishing band 44 (see FIG. 2 ). This creates a cross-cutting structure of the surface of the circumferential surface 38 which is characteristic for finishing. To create an oscillating motion 42 , the workpiece portion 36 and/or the finishing band 44 may reciprocate in a direction parallel to the axis of rotation 40 of the workpiece portion 36 . For the generation of the oscillating action 42 , a oscillating drive, which is likewise known but not further described, is provided.

[0040] During machining of the workpiece portion 36, the finishing band 44 is pressed towards the circumferential surface 38 via the bite angle portion 46 (see FIG. 1). For a better overview of the drawing, the finishing band 44 is not shown in FIG. 1 . A pressure band 48 is used to press the finishing band 44 towards the circumferential surface 38 . The pressure band 48 is, for example, a metal band, which may be relatively thin, for example having a material thickness of between 0.2 mm and about 1.5 mm.

The pressure band 48 has distal ends directed away from each other, these ends being each secured to one of the holder arms 22 , for example secured using a threaded portion 50 .

The support member 26 comprises two support bearings 52 , which are arranged on both sides of the angle of engagement 46 and are formed in particular as ridges in the form of peaks. Support bearings 52 support the pressure band 38 in support portions 54 locally defined in the band direction. Between the supporting parts 54 in the band direction, a free pressing part 56 of the unsupported pressing band is provided. Free band portions 58 are provided which are not supported outside the support portions 54 in the band direction.

The pressure band 48 is effected with first and second pressure using support bearings 52 in the region of the support portions 54 , which pressure is applied to the base portion ( 20) and facing away from it. In the region of the engagement angle portion 46 the finishing band applies a third pressure to the pressure band 48 , which pressure is directed in the direction of the base portion 20 of the holder 14 and is directed to first and second pressures. is equal to the sum of

[0044] An advantage of the support member 26 being supported in the holder 14 rotatably about the pivot axis 28 is the operation of the press arm 16 about the press arm axis 18 (see FIG. 2). This is not directly transferred to the same operation of the pressure band 48; Rather, an additional degree of freedom is provided around the axis of rotation 28 so that the support member 26 is rotatable about the axis of rotation 28 . In FIG. 2 the support member 26 is shown in an appropriately biased position relative to the basic position shown in FIG. 1 .

[0045] The aforementioned equalization possibilities are explained below with reference to other embodiments of the pressing device 10 and the finishing device 12 according to FIGS. 3 and 4 . The pressing device 10 of the finishing device 12 according to FIGS. 3 and 4 is likewise suitable for machining workpiece parts 36 of different sizes; It is suitable, for example, for the machining of relatively small workpiece parts 36a (see FIG. 3 ) and relatively large workpiece parts 36b (see FIG. 4 ).

[0046] When machining a relatively small workpiece part 36a, the pressing devices 10 facing each other are spaced apart in relatively close proximity to each other (see FIG. 3 ), whereas this spacing is a relatively large workpiece part (36b) increases during processing (see FIG. 4). When machining the relatively large workpiece portion 36b, while the support member is held in its basic position relative to or spaced apart from the holder 14 when machining the relatively small workpiece portion 36a The support member 26 pivots to the biased position shown in FIG. 4 .

In contrast to the holder 14 according to FIGS. 1 and 2 being an integral part of the pressing arm 16 , the holder 14 of the pressing device 10 according to FIGS. 3 and 4 is a pressing arm 16 . provided separately from The holders 14 according to FIGS. 3 and 4 likewise comprise a base 20 and holder arms 22 for the delimitation of a receiving space 24 for the support member 26 .

The holder 14 according to FIGS. 3 and 4 is rigidly connected with a plier arm 16 by means of an additional screw connection 60 , in particular the base 20 of the holder 14 . ) is used to do so.

[0049] Hereinafter, embodiments of a pressing device will be described with reference to FIGS. 5 to 8, and this pressing device has a structure similar to that of the pressing device 10 described with reference to FIGS. 1 to 4 above. Therefore, only differences from the previously described pressing device 10 will be dealt with below.

The pressing devices 10 according to FIGS. 5 to 8 include support bearings 52 , which support bearings are elastically bendable. For this purpose, support members 62 , which are curved in an arc in the region of the support bearings 52 , can be used, these support members being immovably coupled to the support member 26 . The support members 62 are for example made of elastomer, in particular Vulkoran. The support members 62 preferably extend at an angle greater than 90° and eg 180°.

[0051] Additionally or alternatively to the plate-shaped or arcuate pressure member 62 (see FIGS. 5 and 6), a substantially cylindrical pressure roller 64 (see FIGS. 7 and 8) may be used. have. Pressure rollers are for example made of elastomers, in particular Vulkoran. The pressure rollers may be immovably fixed to the support member 26 (see, for example, FIG. 7 , in which the pressure roller 64 is embedded in the receptacle 65 ). Alternatively to this, the pressure rollers 64 may be supported on a support member 26 rotatably around a roller axis 66 (see FIG. 8 ).

The pressure band 48 described above and below in relation to the various pressing devices 10 and finishing devices 12 may be formed smoothly on the front side toward the rear side of the finishing band 44 . In this case, the pressing surface 66 of the pressing part 56 of the pressing band 48 is exactly at the level of the bearing bearings 52 with the friction surfaces 68 of the supporting part 54 of the pressing band 48 . equally smooth. In this case, the static friction between the pressure surface 66 and the rear side of the finishing band 44 is exactly equal to the static friction between the friction surfaces 68 of the pressure band 48 and the rear side of the finishing band 44 . do.

6 and 8 , in another embodiment of the present invention, the friction surfaces 68 include a coating 70 having a roughened or roughened surface at the level of the support bearing 52 .

The pressing surface 66 of the pressing portion 56 is particularly smooth and does not include rough portions and/or coatings 70 . However, it is conceivable that the pressure band 48 is also roughened and/or includes a coating 70 in the region of the pressure surface 66 .

Alternatively or additionally to the aforementioned front side of the pressure band 48 being roughened in the area of the friction surfaces 68 , also the rear side of the pressure band 48 and/or the bearing bearing The poles 52 themselves may include a suitable roughening portion or coating 70 . It cooperates with the rear side of the pressure band 48 (see FIGS. 6 and 8, reference numeral 72). The roughness portions or coatings 72 may be disposed directly on the body forming the support member 26 (eg on the support member 26 ) (according to FIG. 1 ), or as shown in FIGS. 6 and 8 . as in particular on a support member 62 or a support roller 64 made of an elastomeric material.

[0056] The entire pressing device 10 and finishing device 12 described above comprises a rotational axis 28 of the support member 26, the rotational axis of which is the rotational axis 40 of the workpiece portion 36 to be machined. parallel to This axis of rotation is a tilting axis, that is, an axis that enables "tilting" of the support member 26 .

Additionally or alternatively to this, the support member 26 may be supported in an oscillating manner about an oscillation axis 74 , wherein the oscillation axis 74 is the oscillation axis of the workpiece portion 36 to be machined. perpendicular to the axis of rotation 40 (see FIGS. 9 and 10 ). The expression “vertical” chosen in this context does not imply that the axis of rotation 40 and the axis of oscillation 74 must intersect each other; The mentioned axes may be spaced apart from each other within a range of a minimum distance.

In use of the oscillation shaft 74 , for example, the holder arm 22 of the holder 14 may have a bearing bolt 76 that enters the bolt receiver 78 of the support member 26 . Preferably, the inner faces 80 of the holder arm 22 facing each other serve as guide faces for the outer faces 82 of the support member 26 .

[0059] The examples of the formation of the pressure bands described below, in particular the fixing possibilities of the pressure bands described below, are advantageous in themselves and can be used in a pressing device in particular when the support member does not comprise a pivot shaft ( That is, the pressing device according to claim 1, except for the feature that the support member includes a pivot shaft).

[0060] Hereinafter, the fixing possibility of the pressure band 48 of the pressing device 10 will be described with reference to FIGS. suitable for a support member 26 (which does not include coaxial and can be rigidly coupled with the plier arm 16).

[0061] The pressure band 48 is coupled with the support member 26 using, for example, a connecting device 50 at one end, and in particular can be screwed together (see FIG. 11 ), and using a connecting device 84 at the other end. to the plier arm 16 (especially on the inside pointing in the direction of the opposite plier arm 16), preferably using screws.

In the embodiment according to FIG. 11 , the two pressing devices 10 each have their own pressure band 48 .

[0063] It is also connected at one free end with the support member 26 of the first pressing device 10, in particular by means of a connecting device 50, in particular screwed together (see FIG. 12), and at the other end it is connected with a connecting device It is possible to use a pressure band 48 which is connected with the support member 26 of the second pressing device 10 by means of 50 , in particular is screwed together. Such a pressure band 48 , which is used simultaneously for the two pressing devices 10 , is preferably around a turning axis 88 at a turning part 86 arranged between both pressing devices 10 . change direction from

Claims (12)

Pressing the finishing band 44 on the circumferential surfaces 38 of the substantially cylindrical workpiece portions 36 in a finishing operation, wherein the finishing band 44 is circumferentially applied by a pressing force through the engagement angle portion 46 . A pressing device (10) comprising a pressure band (48) for pressing in a pressurized manner against a face (38),
The pressure band 48 is supported on two support bearings 52 of a support member 26 comprising at least one axis of rotation 28 , the support bearings on both sides of the engagement angle portion 46 . is placed in
The pressure band (48) is fixed to a holder (14) provided separately from the support member (26), the support member (26) being relative to the holder (14) at the at least one axis of rotation (28). A pressing device (10), characterized in that it is rotatable around the circumference. The method according to claim 1,
Pressing device (10), characterized in that the pressure band (48) comprises unsupported free band portions (56, 58) on either side of the support bearings (52) when viewed in the direction of the band of the pressure band (10). . The method according to claim 1,
The pressing device (10), characterized in that the support bearings (52) are made of an elastically bendable material. The method according to claim 1,
Pressing device (10), characterized in that the support bearings (52) are made of elastomer. delete The method according to claim 1,
A pressing device (10), characterized in that the holder (14) comprises a receiving space (24) defined in a U shape for the placement of the support member (26). The method according to claim 1,
Pressing device (10), characterized in that the holder (14) engages with or is part of the pressing arm (16), the pressing arm (16) being rotatable about a pressing arm axis (18) . The method according to claim 1,
A tilting axis is provided as at least one axis of rotation (28), the tilting axis extending in a direction parallel to the axis of rotation (40) of the work piece in relation to the work piece to be machined ). The method according to claim 1,
An oscillation axis (74) is provided as at least one axis of rotation (28), said oscillation axis extending in a direction perpendicular to the axis of rotation (40) of the workpiece in relation to the workpiece to be machined device (10). The method according to claim 1,
The pressure band 48 comprises friction surfaces 68 at the level of the support bearings 52 , the pressure band being interposed between the support bearings 52 in the area of the engagement angle portion 46 . a pressure surface 66 in the pressure band 48, the static friction between the friction surfaces 68 of the pressure band 48 and the rear side of the finishing band 44 is equal to the pressure surface 66 of the pressure band 48 and Pressing device (10), characterized in that it is greater than the static friction between the rear side of the finishing band (44). 11. The method of claim 10,
The pressing device (10), characterized in that the friction surfaces (68) have a greater roughness than the pressing surfaces (66). The method according to claim 1,
The support bearings 52 may include roughened surfaces or friction coatings 72 , which engage/engage with the rear side of the pressure band 48 away from the finishing band 44 . or the rear side of the pressure band (48) comprises roughened surfaces or friction coatings (72).

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