DE202018101202U1 - System, with a workpiece in the form of a threaded spindle and with a finishing device - Google Patents

Abstract

A system (10) comprising a workpiece (12) in the form of a threaded spindle (14) and a finishing device (20) for machining the threaded spindle (14), the finishing device (20) comprising an abrasive finishing tool in the form of an abrasive belt (22). Further, a pressing element (44) for pressing the abrasive tape (22) against a threaded portion (68) of the threaded spindle (14), wherein the pressing member (44) has a pressing portion (62), with the interposition of the abrasive tape (22) in a Working space (74) can be introduced, which is bounded by two mutually adjacent, mutually facing thread flanks (70, 72), characterized in that in one or starting from a basic position of the pressing member (44) of the pressing portion (62) and the abrasive tape (22 ) preferably with play afflicted in the working space (74) can be arranged, that a pivot drive (38) is provided, by means of which the pressure element (44) to a Swivel axis (42) is pivotable, wherein in a relative to the basic position pivoted working position of the pressing member (44) of the pressing portion (62) with at least one of two mutually remote pressing surfaces (64, 66) at least one of different sections (22a, 22b) of the Abrasive belt (22) against at least one of the mutually facing thread flanks (70, 72) presses.

Description

The invention relates to a system comprising a workpiece in the form of a threaded spindle and a fine machining device for machining the threaded spindle, wherein the fine machining device comprises an abrasive abrasive finishing tool in the form of abrasive, further comprises a pressing element for pressing the abrasive against a threaded portion of the threaded spindle, wherein the Pressing element has a pressing portion which can be introduced with the interposition of the abrasive tape in a working space which is bounded by two mutually adjacent, mutually facing thread flanks.

From the DE 10 2014 111 790 A1 For example, a method of polishing a ball screw is known. In this method, a pressure roller is used, which presses a polishing belt in the circumferential groove-shaped recess of the ball screw. The radius of the contour of the pressure roller plus the thickness of the polishing belt corresponds to the radius of the profile of the groove-shaped depression.

In principle, it would be possible to use the above method also for the machining of threaded spindles, which limit a working space between two mutually adjacent, mutually facing thread flanks. The raw geometry of a threaded spindle is produced, for example, in the context of a thread rolling or thread rolling process, in which cylindrical blanks are deformed so that a thread structure is formed. Such produced raw geometries have process-related irregularities, ie deviations of the geometry of the thread flanks from a desired geometry. In an application of the in DE 10 2014 111 790 A1 disclosed method in a threaded spindle subject to the pressure roller and the polishing belt, due to the irregularities described, a greatly increased wear. This is disadvantageous in particular when machining relatively long workpieces.

Proceeding from this, the present invention has the object to provide a fine machining device, which makes it possible to provide the thread flanks of a threaded spindle with a defined surface structure, with the disadvantages discussed above to be avoided.

This object is achieved in a system of the type mentioned above in that in one or starting from a basic position of the pressure element of the pressure and the Abrasivband preferably with play afflicted in the working space can be arranged that a pivot drive is provided by means of which the pressure element to a Pivot axis is pivotable, wherein pressed in a relative to the basic position pivoted working position of the pressure element of at least one of two opposing pressure surfaces at least one of different sections of Abrasivbandes against at least one of the mutually facing thread flanks.

According to the invention, the distances of the thread flanks on the one hand and the geometry of the pressing portion of the pressing and the other hand, the thickness of the abrasive tape coordinated so that at least in one or starting from a basic position of the pressure element of the pressure and the Abrasivband preferably tainted in the limited between the thread flanks Working space can be arranged. The pressing element is pivotable about a pivot axis, so that the pressing portion rests in a working position with at least one pressing surfaces facing away from each other on at least one of the thread flanks of the threaded spindles. It may therefore be preferable to first hold a game that can then be compensated by the pivoting of the pressing element. Any changes in the distance of the thread flanks ("irregularities" described above) along the course of the thread of the threaded spindle can be compensated by minimal pivoting movements of the pressure element.

It is preferred that the pivot drive is force-controlled, so that the system of the pressure surfaces at rear portions of the abrasive belt and the pressing of abrasive abrasive front portions of the abrasive tape on the thread flanks is carried out with a predetermined force. As a result, a constant pressure force is ensured, at the same time - by means of minimal pivoting movements of the pressure element - geometric irregularities of the thread flanks can be compensated.

It is preferred that the pressing element is aligned symmetrically in its basic position relative to the two mutually facing thread flanks in order to hold in the basic position a respective game to both thread flanks.

Preferably, the pivot axis is perpendicular to the workpiece axis of the threaded spindle. This simplifies the definition of the basic position and makes it possible to use a pressure section symmetrical in the profile.

Preferably, the pivot axis intersects the workpiece axis of the threaded spindle. This makes it possible optimally to the course and the length of the respective contact areas of the pressing surfaces distribute, so that the two contact areas are preferably symmetrical to each other in terms of their length and their course.

Furthermore, it is preferred that a rotational drive is provided for rotating the threaded spindle about the workpiece axis. This is an easy way to provide high cutting speeds. Such a rotary drive can also be used to rotate the threaded spindle at intervals in a first direction (for example, each 360 °) and rotate in intermediate intervals, the threaded spindle in the opposite direction (for example, less than 360 °, eg only 340 ° ).

Preferably, the pressure element is designed in the form of a pressure plate. Such a disk enables the provision of a pressing portion in the form of an endlessly circulating pressing portion.

It is preferred that the pressing element is rotatable about an axis of rotation. This makes it possible to be able to track a pressing portion by simply rotating the pressing element, wherein the speed of the pressing portion preferably corresponds to a feed rate of the abrasive tape.

In the basic position of the pressure element, the axis of rotation of the pressure element preferably runs parallel to the workpiece axis of the threaded spindle. In this way, it is possible to provide a comparatively large pressing portion in relation to the working space.

Preferably, the axis of rotation is formed by a pivot bearing, which is pivotable by means of the pivot drive. This makes it possible to pivot a pressing element rotatable about the axis of rotation.

It is preferred if the pressure element along the axis of rotation in the axial direction along a limited axial travel is movable. As a result, a further compensation possibility for compensating irregularities of the thread flanks is created. Moreover, it is thus possible that a rotational movement of the threaded spindle, a pitch of the thread on the one hand and a relative movement of the abrasive tape in a direction parallel to the workpiece axis direction need not be perfectly synchronized with each other.

Furthermore, it is preferred if a locking device is provided, by means of which a position of the pressure element along the axis of rotation in the axial direction is releasably fixed. This has the advantage that a position of the pressing element along the axis of rotation can be fixed, so that the pressing portion can be introduced from the outside without collision in the working space. During fine machining, the locking device can be solved, so that the above-described, further compensation option is realized.

Preferably, a belt conveyor is provided, by means of which the abrasive belt can be conveyed at least in one feed direction. Particularly preferred is a continuous tape feed, whereby a complex indexing is avoided and at the same time ensures that along the course of the thread of the threaded spindle continuously fresh abrasive tape can be provided.

It is possible that the belt conveyor also conveys in a reverse direction, so that the abrasive belt is "scythed" back and forth, whereby an additional movement component is generated, similar to an oscillatory motion in a finishing process. It is possible that a feed of fresh abrasive tape is longer than a return stroke, so for example, a feed of 10 mm and a return stroke of 9 mm can be selected.

Preferably, a positioning device is provided, by means of which the pressure element, preferably also the pivot drive, in a direction parallel to the pivot axis direction and / or in a radial direction relative to the workpiece axis of the threaded spindle can be positioned. This allows an automated introduction of the pressing portion into the working space.

Preferably, a displacement device is provided, by means of which the pressure element, preferably also the pivot drive, in a direction parallel to the workpiece axis of the threaded spindle direction is movable, preferably along the entire length of the threaded spindle. This makes it possible that the total length of the system need not be longer or not significantly longer than the length of the workpiece.

Furthermore, it is possible that an oscillation device is provided, by means of which a relative movement between the threaded spindle and the abrasive belt can be generated, which extends in a tangential direction relative to the workpiece axis of the threaded spindle. This makes it possible to realize a finish machining, which is characterized by a superposition of rotational movement of the workpiece relative to the tool (here: abrasive belt) and an oscillatory movement of the tool relative to the workpiece.

A preferred embodiment of the invention provides that the pivot drive a Biasing means comprises or is formed by such, wherein the biasing means the force applied to the pressing element in the direction of its normal position and / or pretending the basic position of the pressure element. In this way, a particularly simple constructed pivot drive can be provided, which preferably simultaneously generates a machining force in a simple manner, with which the pressure element presses the abrasive tape against at least one thread flank.

It is possible for the pretensioning device to apply force to a pivot support for arranging the pressure element about the pivot axis and / or to form a pivoting support.

A simply constructed pretensioning device comprises a compression or tension spring or at least one leaf spring, preferably a pair of mutually parallel leaf springs.

A further preferred embodiment of the invention provides that at least one support element for supporting the threaded spindle is provided in an at least approximately radial direction to the workpiece axis of the threaded spindle. Such a support element is preferably effective along the workpiece axis of the threaded spindle, at least also at the level of the working space of the threaded spindle, so that machining forces exerted on the threaded spindle by the pressure element can be absorbed particularly well by the at least one support element. As a result, a "bending" or "swinging" especially very slim threaded spindles can be prevented.

Preferably, the at least one support element are arranged with respect to the workpiece axis of the threaded spindle on opposite sides of the threaded spindle in order to allow a particularly good absorption of machining forces.

Furthermore, it is possible that a drive device is provided, by means of which the pressure element and the at least one support element are movable in the direction of the threaded spindle. Such a drive device may be, for example, a linear drive or even a simple spring, which moves the pressure element and the support element in mutually facing directions toward the threaded spindle or presses it against the threaded spindle.

The invention also relates to a fine machining apparatus for use in a system as described above.

Further features and advantages of the invention are the subject of the following description and the diagrammatic representation of a preferred embodiment.

• 1 eine perspektivische Ansicht einer Ausführungsform eines Systems mit einer Feinbearbeitungsvorrichtung und mit einer Gewindespindel;
• 2 eine Draufsicht eines Teils eines Andrückelements der Feinbearbeitungsvorrichtung und der Gewindespindel gemäß 1, wobei das Andrückelement in seiner Grundstellung dargestellt ist;
• 3 eine der 2 entsprechende Ansicht, mit schematischer Darstellung eines Abrasivbandes;
• 4 eine Schnittansicht längs einer in 3 mit IV-IV bezeichneten Schnittebene;
• 5 eine der 2 entsprechende Ansicht, wobei das Andrückelement in einer aus seiner Grundstellung verschwenkten Arbeitsstellung dargestellt ist;
• 6 eine perspektivische Ansicht des Systems in der Arbeitsstellung des Andrückelements;
• 7 eine Rückansicht der Feinbearbeitungsvorrichtung in einer Grundstellung des Andrückelements;
• 8 eine der 7 entsprechende Ansicht in einer Arbeitsstellung des Andrückelements;
• 9 eine Seitenansicht einer weiteren Ausführungsform eines Systems mit einer Feinbearbeitungsvorrichtung und mit einer Gewindespindel, wobei die Feinbearbeitungsvorrichtung eine Oszillationseinrichtung aufweist;
• 10 eine der 7 entsprechende Ansicht in einer Grundstellung des Andrückelements einer weiteren Ausführungsform einer Feinbearbeitungsvorrichtung;
• 11 eine der 10 entsprechende Ansicht in einer Arbeitsstellung des Andrückelements;
• 12 eine Draufsicht einer weiteren Ausführungsform eines Systems; und
• 13 eine Seitenansicht einer weiteren Ausführungsform eines Systems.

In the drawing shows

• 1 a perspective view of an embodiment of a system with a finishing device and with a threaded spindle;
• 2 a plan view of a portion of a pressing member of the fine machining device and the threaded spindle according to 1 , wherein the pressure element is shown in its normal position;
• 3 one of the 2 corresponding view, with a schematic representation of an abrasive tape;
• 4 a sectional view along an in 3 sectional plane designated IV-IV;
• 5 one of the 2 corresponding view, wherein the pressure element is shown in a pivoted from its basic position working position;
• 6 a perspective view of the system in the working position of the pressing member;
• 7 a rear view of the fine machining device in a basic position of the pressing member;
• 8th one of the 7 corresponding view in a working position of the pressure element;
• 9 a side view of another embodiment of a system with a finishing device and with a threaded spindle, wherein the fine machining device comprises an oscillation device;
• 10 one of the 7 corresponding view in a basic position of the pressing member of another embodiment of a fine machining device;
• 11 one of the 10 corresponding view in a working position of the pressure element;
• 12 a plan view of another embodiment of a system; and
• 13 a side view of another embodiment of a system.

A system shown in the drawing 10 includes a workpiece 12 in the form of a threaded spindle 14 extending along a workpiece axis 16 extends. The threaded spindle 14 is by means of a rotational drive shown schematically 18 around the workpiece axis 16 rotatably drivable. For example, it is the threaded spindle 14 around a trapezoidal spindle. This can be very long deviating from the graphic representation, for example. 1 m or 1.5 m.

The system further includes a finisher, generally designated by the reference numeral 20. This includes a in 1 schematically with a dotted line shown abrasive tape 22 , This is by means of a belt conveyor, not shown in the drawing in the feed direction 24 and optionally additionally in the backward direction 26 conveyed.

The fine processing device 20 is by means of a schematically shown traversing device 28 along a track axis 30 moved, preferably in one to the workpiece axis 16 parallel direction.

The fine processing device 20 has a positioning device 32 on, with a drive unit 34 for driving a frame part 36 in one to the workpiece axis 16 radial direction.

On the frame part 36 is a swivel drive 38 fixed, by means of which a pivot carrier 40 around a pivot axis 42 is pivotable. The Schenk axis 42 runs perpendicular to the workpiece axis 16 and cut them.

On the swivel carrier 40 is a pressing element 44 in the form of a pressure plate 46 around a rotation axis 48 rotatably mounted. This is due to the pivot carrier 40 a pivot bearing 41 arranged.

Along the axis of rotation 48 is the pressure disk 46 like with a in 1 with double arrow 50 indicated, axially movable. For detection and release of the pressure disk 46 along the axis of rotation 48 is a locking device 50 intended. This has a locking drive 52 on, on the swivel carrier 40 is attached and a wedge-shaped output element 56 having. This engages between two in the axial direction fixed to the axis of rotation 48 connected boundary discs 58 and 60 one. Depending on the position of the output element 56 are the boundary discs 58 and 60 and thus the axis of rotation 48 and thus the pressure disk 56 movable in the axial direction or not.

The pressure disk 46 has on the edge side a pressing portion 62, with two facing away from each other Andrückflächen 64 and 66 , see. 2 , In 2 is the abrasive tape 22 not shown. The pressure disk 46 assumes its basic position, in which the axis of rotation 48 parallel to the workpiece axis 16 is aligned or the pitch of the thread of the threaded spindle 14 is inclined accordingly.

The threaded spindle 14 has a threaded portion 68 on, the profile facing each other thread flanks 70 and 72 which together has a working space 74 limit. In 2 this is to improve the clarity two threads offset from the Andrückabschnitt 62 shown; it is understood, however, that the pressing portion 62 in a workroom 74 is arranged, that of two thread flanks 70 and 72 is limited.

In 3 and 4 is starting from 2 also the abrasive tape 22 shown with a border section 22a on a first thread flank 70 , with a border section 22b on an opposite second thread flank 72 and with a central section 22c on a thread 76 (see. 2 ) is applied, in the basic position of the pressure plate 46 with play afflicted (for example 0.02 mm to 3 mm).

A pivoting of the pressure plate in a working position causes a movement of the pressing surfaces 64 respectively. 66 in the direction of the respective adjacent thread flanks 70 respectively. 72 , Undoing the game becomes the abrasive belt 22 with the edge sections 22a respectively. 22b against the thread flanks 70 or 72 pressed, cf. 6 , There are Andrückbereiche, in which the edge sections 22a respectively. 22b of the abrasive band 22 are effective, with reference numerals 78 respectively. 80 designated. These pressing areas are, with intersecting and vertical arrangement of the pivot axis 42 and the workpiece axis 16 , symmetrical to each other. But it is also possible that the pivot axis 42 and the workpiece axis 16 do not cut and thus create non-symmetrical pressure areas to each other.

To define the pivoting positions, it is preferred that end positions of the pivot carrier 40 through stops 82 and 84 are predetermined. The swivel carrier 40 has a nose 86 on that between the stops 82 and 84 is arranged. In a basic position of the pressure disk 46 is the nose 86 at the first stop 82 on, cf. 7 , In a maximum pivoted position is the nose 86 at the second stop 84 on, cf. 8th , The total available swivel angle 88 is, for example, a maximum of 15 ° or a maximum of 10 °. Typical working positions of the working disk correspond to smaller angles of, for example, 1 ° to 5 °, in each case based on the basic position (cf. 7 or reference line 90 in 8th ).

The peculiarity of in 9 illustrated embodiment of a system 10 is that an oscillation device 92 is provided. This is on the frame part 36 fixed and serves to the pivot carrier 40 and related Components along an oscillation axis 94 to move back and forth. The axis 94 runs tangentially to the workpiece axis 16 , With active oscillation device 92 is the rotational movement between workpiece 12 and abrasive tape 22 superimposed on a linear oscillation movement.

In the in the 10 and 11 embodiment shown is the pivot drive 38 by a pretensioner 96 educated. This has, for example, a tension spring 98 on, which at one end to the frame part 36 is fixed and at the other end to the pivot carrier 40 attacks. The tension spring acts on the pivot carrier 40 around the pivot axis 42 around in the direction of a basic position of the pressure element 44 (see. 10 ).

In a basic position of the pressing element 44 there is a stop surface 83 of the pivot carrier 40 at a stop 82 on the frame part 36 is fixed. At an introduction of the pressing section 62 of the pressing element 44 in the workroom 74 can the pressure element 44 together with the swivel carrier 40 around the pivot axis 42 to pivot into a working position (cf. 11 ), in which the pretensioner 96 one in the direction of the basic position of the pressure element 44 provides oriented pressing force with which the pressing surfaces 64 . 66 of the pressing element 44 the abrasive tape 22 for machining the thread flanks 70 . 72 opposes them, see also the description above 2 to 6 ,

At the in 12 illustrated embodiment, the pivot carrier 40 of the pressing element 44 by two parallel leaf springs 100 educated. As a result, the pivot carrier forms 40 at the same time a rotary actuator 38 , Starting from a basic position of the leaf springs 100 and the pressing element 44 can the Andrückabschnitt 62 of the pressing element 44 in the workroom 74 be introduced. The pitch of the thread of the threaded spindle 14 accordingly, the leaf springs 100 then twisted, with the pressure element 44 around the pivot axis 42 pivoted. The leaf springs 100 So are around the pivot axis 42 can be twisted around between a basic position and different working positions, this twisting the leaf springs 100 Restoring forces generated as pressing forces of the pressure element 44 are usable.

At the in 13 illustrated embodiment are support elements 102 provided in the form of support wheels or support rollers, which based on the threaded spindle 14 on a pressing element 44 opposite side of the threaded spindle 14 are arranged and thus can absorb processing forces. The support elements 102 are rotatably mounted on a support member carrier 104.

Preferably, a drive device 106 provided by means of which the pivot carrier 40 and the support element carrier 104 from the outside on the threaded spindle 14 can be pressed. It is also possible that the pivot carrier 40 and / or the support element carrier 104 along a track axis 108 are movable. The travel axis 108 runs for example in the vertical direction and preferably perpendicular to a horizontal axis 30 a moving device 28 , see. 13 and 1 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014111790 A1 [0002, 0003]

Claims (20)

A system (10) comprising a workpiece (12) in the form of a threaded spindle (14) and a finishing device (20) for machining the threaded spindle (14), the finishing device (20) comprising an abrasive finishing tool in the form of an abrasive belt (22). Further, a pressing element (44) for pressing the abrasive tape (22) against a threaded portion (68) of the threaded spindle (14), wherein the pressing member (44) has a pressing portion (62), with the interposition of the abrasive tape (22) in a Working space (74) can be introduced, which is bounded by two mutually adjacent, mutually facing thread flanks (70, 72), characterized in that in one or starting from a basic position of the pressing member (44) of the pressing portion (62) and the abrasive tape (22 ) preferably with play afflicted in the working space (74) can be arranged, that a pivot drive (38) is provided, by means of which the pressure element (44) to a e pivot axis (42) is pivotable, wherein in a relative to the basic position pivoted working position of the pressing member (44) of the pressing portion (62) with at least one of two opposing pressing surfaces (64, 66) at least one of different sections (22a, 22b) of the abrasive belt (22) presses against at least one of the mutually facing thread flanks (70, 72). System (10) after Claim 1 , characterized in that the pivot axis (42) perpendicular to the workpiece axis (16) of the threaded spindle (14). System (10) according to any one of the preceding claims, characterized in that the pivot axis (42) intersecting the workpiece axis (16) of the threaded spindle (14). System (10) according to any one of the preceding claims, characterized in that a rotary drive (18) for rotation of the threaded spindle (14) about the workpiece axis (16) is provided. System (10) according to any one of the preceding claims, characterized in that the pressure element (44) in the form of a pressure plate (46) is formed. System (10) according to one of the preceding claims, characterized in that the pressure element (44) about an axis of rotation (48) is rotatable, wherein preferably the axis of rotation (48) in the basic position of the pressing element (44) to the workpiece axis (16) of Threaded spindle (14) runs parallel. System (10) after Claim 6 , characterized in that the axis of rotation (48) by a pivot bearing (41) is formed, which by means of the pivot drive (38) is pivotable. System (10) after Claim 6 or 7 , characterized in that the pressing element (44) along the rotational axis (48) in the axial direction along a limited axial travel is movable. System (10) after Claim 8 , characterized in that a locking device (50) is provided, by means of which a position of the pressing element (44) along the axis of rotation (48) in the axial direction releasably fixed. System (10) according to any one of the preceding claims, characterized in that a belt conveyor is provided, by means of which the abrasive belt (22) at least in a feed direction (24) is conveyed, preferably both in the feed direction (24) and in an opposite direction of return (26). System (10) according to any one of the preceding claims, characterized in that a positioning device (32) is provided, by means of which the pressing element (44), preferably also the pivot drive (38), in a direction parallel to the pivot axis (42) direction and / or in a radial direction relative to the workpiece axis (16) of the threaded spindle (14) can be positioned. System (10) according to any one of the preceding claims, characterized in that a displacement device (28) is provided, by means of which the pressure element (44), preferably also the pivot drive (38), in one of the workpiece axis (16) of the threaded spindle (14 ) parallel direction, preferably along the entire length of the threaded spindle (14). System (10) according to one of the preceding claims, characterized in that an oscillation device (92) is provided, by means of which a relative movement between the threaded spindle (14) and the abrasive belt (22) can be generated, based on the workpiece axis (16) of Threaded spindle (14) extends in the tangential direction. System (10) according to any one of the preceding claims, characterized in that the pivot drive (38) comprises a biasing means (96) or is formed by such, wherein the biasing means (96) the pressing element (44) in the direction of its normal position and / / or the basic position of the pressing element (44) pretends. System (10) after Claim 14 characterized in that the biasing means (96) applies a pivotal support (40) for locating the pressing member (44) about the pivot axis (42) and / or forms a pivot support (40). System (10) after Claim 14 or 15 , characterized in that the biasing means (96) comprises a compression or tension spring (98) or at least one leaf spring (100). System (10) according to one of the preceding claims, characterized in that at least one support element (102) for supporting the threaded spindle (14) is provided in an at least approximately radial direction to the workpiece axis (16) of the threaded spindle (14). System (10) after Claim 16 , characterized in that the pressing element (44) and the at least one support element (102) with respect to the workpiece axis (16) of the threaded spindle (14) on opposite sides of the threaded spindle (14) are arranged. System (10) after Claim 17 , characterized in that a drive device (106) is provided, by means of which the pressure element (44) and the at least one support element (102) in the direction of the threaded spindle (14) are movable. Finishing apparatus (20) for use in a system (10) according to any one of the preceding claims.

Images