WO2005014232A1 - Screwing tool for screwing in sensitive parts, and method therefor - Google Patents

Screwing tool for screwing in sensitive parts, and method therefor Download PDF

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Publication number
WO2005014232A1
WO2005014232A1 PCT/DE2004/001117 DE2004001117W WO2005014232A1 WO 2005014232 A1 WO2005014232 A1 WO 2005014232A1 DE 2004001117 W DE2004001117 W DE 2004001117W WO 2005014232 A1 WO2005014232 A1 WO 2005014232A1
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WO
WIPO (PCT)
Prior art keywords
screwing
torque
angle
screwing tool
controlled
Prior art date
Application number
PCT/DE2004/001117
Other languages
German (de)
French (fr)
Inventor
Christian Braeurer
Stefan Holl
Original Assignee
Robert Bosch Gmbh
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Publication date
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Publication of WO2005014232A1 publication Critical patent/WO2005014232A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • Screwing tool for screwing in sensitive components and methods therefor
  • the invention relates to a screwing tool for screwing in a sensitive mounting element and a method therefor.
  • the value of the torque is measured and the mounting element is not rotated further than until a predetermined torque, the target torque, is reached.
  • the mounting element In the case of the angular pull, a certain target screwing angle is specified and the mounting element is screwed in only by this screwing angle.
  • the mounting element which can be a screw, a nut or a screwable functional component, such as a spark plug, an electrode or a valve, is on the one hand screwed so tightly to the desired one
  • the screw connection is not carried out so tightly that there is damage to the threads or even to the component
  • Screwing tool experiences a torsion even when turning, which is not taken into account in the angle measurement. This misalignment cannot be corrected by adding a lump sum to the target rotation angle, since the torsion of the screwing tool is a complex process. The actual screwing angle can be found in
  • the angle tightening method is primarily suitable for expansion screws, i.e. assembly elements that are themselves not susceptible to torsion.
  • assembly elements can be screwed in too tightly and possibly suffer a deformation that damages them.
  • the object of the invention is to achieve a durable screw connection without or with only slight or defined deformation of the mounting element.
  • the solution to the problem is to present a screwing tool that includes a protractor in addition to a torque meter, so that after reaching a predetermined value for the torque, the torque threshold value, the screwing tool also has a defined angle that is greater than 0 degrees , is rotated further.
  • the task is further solved by a method which consists of a sequence of torque-controlled and angle-controlled screwing-in steps.
  • An essential advantage of the invention is that the screwing tool according to the invention enables a screw connection in which a possible deformation of the mounting element either does not take place at all or at least does not depend on the friction between the screw connection surfaces.
  • the mounting element is initially only rotated until a torque threshold value has been reached, it can be ensured by suitable selection of this threshold value that the mounting element is not impaired with such a tightening force.
  • the mounting element is rotated further by a defined angle which can be controlled by the protractor. This is selected so that the additional torque which is exerted by the further rotation by the angle does not produce any deformation or a predetermined deformation which impairs the later functioning of the mounting element.
  • the screwing tool according to the invention can be designed as a hand-held tool that has a torque and angle display for an operator. It can also be used as a fully automatic tool in a production line or as a tool element of a robot. For the automatic It is advantageous if the screwdriver has an interface that can be used to enter the torque threshold and the defined angle of rotation.
  • the invention is advantageously further developed by the screwing tool having a control unit which, depending on one or more torque threshold values, permits a successive sequence of torque and torque-controlled screwing in.
  • the advantage of the method claimed in accordance with the invention also lies in the fact that screwing in is made possible, in which a tight screw connection is achieved and at the same time the assembly element is treated gently. Depending on what the assembly element is, care must be taken, for example, that the assembly element is not twisted or that the screw connection can be released again.
  • an additional process step can be introduced. After tightening the mounting element up to a specified torque, the screw connection is loosened again in order to then carry out the torque-controlled screw connection again.
  • the screwing surfaces of the mounting element and its screwing partner i.e. the contact surfaces of the elements to be screwed
  • the screwing surfaces of the mounting element and its screwing partner i.e. the contact surfaces of the elements to be screwed. It may be that dirt particles between the screwing surfaces, canting of the tool to the mounting element, hardening of the lubricant or other undesired influences, during the screwing, a torque is briefly generated that reaches the threshold value and triggers the termination of the screwing process. In this case there is a so-called "spurious" increase in torque.
  • connection may not be strong enough.
  • the screwing surfaces are moved against each other when loosening and the screwing of the now smoothed screwing surfaces is carried out again in a torque-controlled manner.
  • the screw connection can be continued by a predetermined angle, either by a negative angle, whereby the screw connection is loosened again somewhat, by a positive angle, in accordance with the method described above, or by the angle 0 degrees, which is a purely torque-controlled screw connection equivalent.
  • the method according to the invention is advantageously further developed by loosening the screwing process only up to a certain second lower threshold value of the torque.
  • the second threshold value can be used to ensure that the assembly element is not completely loosened, but rather that the assembly element remains in contact with its screwing partner. This prevents slipping and prevents repositioning.
  • Figure 1 shows the relationship between torque and mounting angle in the conventional torque-controlled screw connection
  • Figure 2 shows the relationship between torque and mounting angle with successively carried out torque and angle-controlled screw connection.
  • Figure 1 shows the relationship between torque, plotted on the y-axis 1 and the angle of rotation by which the mounting element is rotated, hereinafter referred to as the mounting angle, plotted on the x-axis 2 in the conventional torque-controlled screw connection.
  • the mounting angle plotted on the x-axis 2 in the conventional torque-controlled screw connection.
  • the diagram shows a number of assembly curves 4 which show the measured torque at a specific assembly angle for various screwing-in processes.
  • the slopes of the assembly curves 4 shown result from various friction between the screw surfaces of the assembly element and its screwing partner, lubricants, surface properties, manufacturing tolerances, etc., on which practically no influence can be exerted. In this example, there is a considerable spread 5 of the mounting bracket.
  • FIG. 2 shows the relationship between the torque, plotted on the y-axis 11 and the mounting angle, plotted on the x-axis 12, with the torque and angle-controlled screw connection being carried out successively.
  • the slopes of the mounting curves 14 correspond to those in FIG. 1, but the curves are shifted such that the reference angle 16 for all curves is at a specific torque 13, that is to say the curves do not intersect at the point at which the torque as in FIG. 1 and the mounting bracket has the value 0.
  • the assembly elements are initially only rotated up to a torque threshold value 13, in this example 10 Nm, and then rotated further by a predetermined angle 17, here 12 degrees.
  • the spread of the mounting bracket 15 is significantly smaller because it is related to the smaller torque threshold 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

The invention relates to a screwing tool comprising a torque meter and a protractor such that the screwing tool continues rotating by an additional defined angle that is greater than 0 degrees once a torque threshold value has been reached. Also disclosed are methods comprising a sequence of torque-controlled and angle-controlled screwing steps. The invention allows mounting elements to be screwed together in a fixed manner without being deformed or such that the deformation of the mounting element is minimal or defined.

Description

Schraubwerkzeug zum Eindrehen empfindlicher Bauteile sowie Verfah- ren hierfürScrewing tool for screwing in sensitive components and methods therefor
Die Erfindung betrifft ein Schraubwerkzeug zum Einschrauben eines empfindlichen Montageelements sowie ein Verfahren dafür.The invention relates to a screwing tool for screwing in a sensitive mounting element and a method therefor.
Stand der TechnikState of the art
Moderne Schraubanlagen stellen den Grad der Verschraubung mittels Drehmomentüberwachung oder Winkelzug sicher.Modern tightening systems ensure the degree of tightening by means of torque monitoring or angled pull.
Bei der Drehmomentüberwachung wird der Wert des Drehmoments gemessen und das ontageelement nicht weiter als bis zum Erreichen eines vorgegebenen Drehmoments, des Solldrehmoments, gedreht.When monitoring the torque, the value of the torque is measured and the mounting element is not rotated further than until a predetermined torque, the target torque, is reached.
Bei dem Winkelzug wird ein bestimmter Solleindrehwinkel vorgegeben und das Montageelement nur um diesen Eindrehwinkel eingeschraubt. Mit diesen Massnahmen soll sichergestellt werden, dass das Montageelement, bei dem es sich um eine Schraube, eine Mutter oder ein einschraubbares funktionales Bauteil, wie beispielsweise eine Z ndkerze, eine Elektrode oder ein Ventil handeln kann, einerseits so fest verschraubt ist, um die gewünschte Fixierung zu erreichen, andererseits die Verschraubung nicht so fest ausgeführt wird, dass es zu Schaden an den Gewinden oder sogar an dem Bauteil kommtIn the case of the angular pull, a certain target screwing angle is specified and the mounting element is screwed in only by this screwing angle. These measures are intended to ensure that the mounting element, which can be a screw, a nut or a screwable functional component, such as a spark plug, an electrode or a valve, is on the one hand screwed so tightly to the desired one To achieve fixation, on the other hand, the screw connection is not carried out so tightly that there is damage to the threads or even to the component
Nachteile des Standes der TechnikDisadvantages of the prior art
Bei der Winkelzugmethode wird trotz des eingestellten Solldrehwm- kels das Montageelement häufig nicht b s zum gewünschten Drehwm- kel eingeschraubt. Die Ursache dafür liegt darin, dass dasWith the angular pull method, the mounting element is often not screwed in to the desired angle, despite the set desired angle. The reason for this is that
Schraubwerkzeug selbst beim Drehen eine Torsion erfahrt, die bei der Winkelmessung unberücksichtigt bleibt. Dieser Fehlwinkel kann nicht durch das Hinzufugen eines Pauschalbetrags zum Solldrehwinkel korrigiert werden, da die Torsion des Schraubwerkzeug ein kom- plexer Prozess ist. Der tatsächliche Eindrehwinkel lasst sich imScrewing tool experiences a torsion even when turning, which is not taken into account in the angle measurement. This misalignment cannot be corrected by adding a lump sum to the target rotation angle, since the torsion of the screwing tool is a complex process. The actual screwing angle can be found in
Nachhinein nur dadurch bestimmen, dass nach Absetzten des Schraubwerkzeugs vom Montageelement die Restentspannung, also das Zurückdrehen der bei dem Emschraubprozess aufgetretenen Torsion des Schraubwerkzeugs, gemessen und vom Solldrehwinkel abgezogen wird. Eine genaue Voreinstellung des Drehwinkels ist nicht möglich Die Winkelanzugmethode eignet sich vorwiegend für Dehnschrauben, also Montageelemente, die selbst nicht anfällig für eine Torsion sind.Only determine afterwards that after the screwing tool has been removed from the assembly element, the residual relaxation, i.e. the turning back of the torsion of the screwing tool that occurred during the screwing process, is measured and subtracted from the desired angle of rotation. Precise presetting of the angle of rotation is not possible. The angle tightening method is primarily suitable for expansion screws, i.e. assembly elements that are themselves not susceptible to torsion.
Bei der Drehmomentuberwachung hangt der Grad der Verschraubung stark von den beteiligten Schraubflachen ab, also von verwendeten Schmierfetten, Verschmutzungen, Fertigungstoleranzen usw. Die Streuung der Drehwinkel variiert demzufolge über einen großen Bereich .In the case of torque monitoring, the degree of screwing strongly depends on the screwing surfaces involved, i.e. on the ones used Lubricating greases, dirt, manufacturing tolerances, etc. The spread of the angle of rotation consequently varies over a wide range.
Es kann einerseits dazu kommen, dass Montageelemente zu fest eingedreht werden, und dabei womöglich eine sie beschädigende Verformung erleiden. Andererseits ist es möglich, dass nur eine vorübergehende Haftreibung zwischen den Verschraubungsflachen des Montageelements und seines Verschraubungspartners, z.B. durch ein Schmutzpartikel, für ein ausreichendes Drehmoment sorgt, aufgrund dessen der Drehvorgang zu früh abgebrochen wird und es nicht zu einem ausreichenden Halt oder Kontakt kommt.On the one hand, assembly elements can be screwed in too tightly and possibly suffer a deformation that damages them. On the other hand, it is possible that only a temporary static friction between the screwing surfaces of the mounting element and its screwing partner, e.g. due to a dirt particle, ensures sufficient torque, due to which the turning process is stopped too early and there is no sufficient hold or contact.
Aufgabe der ErfindungObject of the invention
Die Aufgabe der Erfindung besteht darin, eine haltbare Verschraubung ohne oder mit nur geringfügiger, bzw. definierter Verformung des Montageelements zu erreichen.The object of the invention is to achieve a durable screw connection without or with only slight or defined deformation of the mounting element.
Losung der AufgabeSolution to the task
Die Losung der Aufgabe besteht darin, ein Schraubwerkzeug vorzu- stellen, das neben einem Drehmomentmesser einen Winkelmesser ura- fasst, sodass nach Erreichen eines vorgegebenen Werts f r das Drehmoment, des Drehmomentschwellwerts, das Schraubwerkzeug zusätzlich um einen definierten Winkel, der großer als 0 Grad ist, weitergedreht wird. Die Aufgabe w rd ferner durch ein Verfahren gelost, das aus einer Abfolge von drehmomentkontroUierten und winkelkontroUierten Eindrehschritten besteht.The solution to the problem is to present a screwing tool that includes a protractor in addition to a torque meter, so that after reaching a predetermined value for the torque, the torque threshold value, the screwing tool also has a defined angle that is greater than 0 degrees , is rotated further. The task is further solved by a method which consists of a sequence of torque-controlled and angle-controlled screwing-in steps.
Vorteile der ErfindungAdvantages of the invention
Ein wesentlicher Vorteil der Erfindung besteht darin, dass das er- findungsgemaße Schraubwerkzeug eine Verschraubung ermöglicht, bei der eine mögliche Verformung des Montageelements entweder gar nicht stattfindet, oder zumindest nicht von der Reibung zwischen den Verschraubungsflachen abhangt.An essential advantage of the invention is that the screwing tool according to the invention enables a screw connection in which a possible deformation of the mounting element either does not take place at all or at least does not depend on the friction between the screw connection surfaces.
Wenn das Montagelement zunächst nur bis zu einem Erreichen eines Drehmomentschwellwert gedreht wird, so kann durch geeignete Wahl dieses Schwellwerts sichergestellt werden, dass bei einer derartigen Anzugstarke das Montageelement nicht beeinträchtigt wird. Um jedoch eine ausreichende Fixierung des Montageelementes zu erreichen, wird das Montageelement noch um einen definierten und m t dem Winkelmesser kontrollierbaren Winkel weitergedreht. Dieser ist so gewählt, dass das zusätzliche Drehmoment, welches durch die Weiterdrehung um den Winkel ausgeübt wird, keine bzw. eine vorgegebene Verformung hervorruft, die die spatere Funktionsweise des Montageelements beeinträchtigt.If the mounting element is initially only rotated until a torque threshold value has been reached, it can be ensured by suitable selection of this threshold value that the mounting element is not impaired with such a tightening force. However, in order to achieve sufficient fixation of the mounting element, the mounting element is rotated further by a defined angle which can be controlled by the protractor. This is selected so that the additional torque which is exerted by the further rotation by the angle does not produce any deformation or a predetermined deformation which impairs the later functioning of the mounting element.
Das erfindungsgemaße Schraubwerkzeug kann als handgehaltenes Werkzeug ausgeführt sein, das über eine Drehmoment- und Hinkelanzeige für einen Bediener verfugt. Es kann auch als vollautomatisches Werkzeug in einer Fertigungsstrasse eingesetzt werden oder als Werkzeugelement eines Roboters verwendet werden. Für den automati- sierten Einsatz ist es gunstig, wenn das Schraubwerkzeug über eine Schnittstelle verfugt, mittels derer der Drehmomentschwellwert und der definierte Drehwinkel eingebbar sind.The screwing tool according to the invention can be designed as a hand-held tool that has a torque and angle display for an operator. It can also be used as a fully automatic tool in a production line or as a tool element of a robot. For the automatic It is advantageous if the screwdriver has an interface that can be used to enter the torque threshold and the defined angle of rotation.
Vorteilhafter wird die Erfindung weitergebildet, indem das Schraubwerkzeug über eine Steuereinheit verfugt, die m Abhängigkeit von einem oder mehreren Drehmomentschwellwerten einen sukzessiven Ablauf von drehmoment- und wmkelkontrolliertem Eindrehen erlaubt .The invention is advantageously further developed by the screwing tool having a control unit which, depending on one or more torque threshold values, permits a successive sequence of torque and torque-controlled screwing in.
Der Vorteil des erfmdungsgemaß beanspruchten Verfahrens liegt ebenfalls darin, dass ein Einschrauben ermöglicht wird, bei welchem eine feste Verschraubung erreicht und gleichzeitig das Montageelement schonend behandelt wird. Je nachdem, worum es sich bei dem Montageelement handelt, rauss beispielsweise darauf geachtet werden, dass es nicht zu einer Torsion des Montageelements kommt oder dass die Schraubverbindung wieder losbar ist.The advantage of the method claimed in accordance with the invention also lies in the fact that screwing in is made possible, in which a tight screw connection is achieved and at the same time the assembly element is treated gently. Depending on what the assembly element is, care must be taken, for example, that the assembly element is not twisted or that the screw connection can be released again.
Um nur vorübergehende Störungen m dem drehmomentkontroUierten Einschraubvorgang zu verhindern, kann ein zusätzlicher Verfahrensschritt eingeführt werden. Dabei wird nach dem Anzug des Montageelements bis zu einem vorgegebenen Drehmoment die Verschraubung zunächst wieder gelost, um anschließend die drehmomentkontrollier- te Verschraubung nochmals durchzufuhren.In order to prevent only temporary disturbances in the torque-controlled screwing-in process, an additional process step can be introduced. After tightening the mounting element up to a specified torque, the screw connection is loosened again in order to then carry out the torque-controlled screw connection again.
Beim Losen werden die Verschraubungsflachen des Montageelements und seines Verschraubungspartners, also die Kontaktflachen der zu verschraubenden Elemente, geglättet. Es kann sein, dass durch Schmutzpartikel zwischen den Verschrau- bungsflachen, eine Verkantung von Werkzeug zu Montageelement, einer Verhärtung des Schmiermittels oder anderer ungewunschter Einflüsse, bei der Verschraubung kurzzeitig ein Drehmoment entsteht, das den Schwellwert erreicht und den Abbruch des Verschraubungs- vorgang auslost. Es kommt in diesem Fall zu einem sogenannten „unechten" Ansteigen des Drehmoments .When loosening, the screwing surfaces of the mounting element and its screwing partner, i.e. the contact surfaces of the elements to be screwed, are smoothed. It may be that dirt particles between the screwing surfaces, canting of the tool to the mounting element, hardening of the lubricant or other undesired influences, during the screwing, a torque is briefly generated that reaches the threshold value and triggers the termination of the screwing process. In this case there is a so-called "spurious" increase in torque.
Wird der Einschraubvorgang tatsächlich beendet, so ist d e Verbm- düng möglicherweise nicht fest genug. Um dem entgegenzuwirken, werden die Verschraubungsflachen beim Losen gegeneinander bewegt und die Verschraubung der nunmehr geglätteten Verschraubungsflachen erneut drehmomentkontrolliert durchgef hrt.If the screwing-in process is actually ended, the connection may not be strong enough. To counteract this, the screwing surfaces are moved against each other when loosening and the screwing of the now smoothed screwing surfaces is carried out again in a torque-controlled manner.
Nach diesem Vorgang kann die Verschraubung um einen vorgegebenen Winkel weitergeführt werden, entweder um einen negativen Winkel, wodurch die Verschraubung wieder etwas gelockert wird, um einen positiven Winkel, entsprechend dem oben beschriebenen Verfahren, oder um den Winkel 0 Grad, was einer rein drehmomentkontroUierten Einschraubung entspricht.After this process, the screw connection can be continued by a predetermined angle, either by a negative angle, whereby the screw connection is loosened again somewhat, by a positive angle, in accordance with the method described above, or by the angle 0 degrees, which is a purely torque-controlled screw connection equivalent.
Das erfindungsgemaße Verfahren wird vorteilhaft weitergebildet, indem die Losung des Schraubvorgangs nur bis zu einem bestimmten zweiten unteren Schwellwert des Drehmoments vorgenommen wird. Mit dem zweiten Schwellwert kann sicher gestellt werden, dass die Losung des Montagelements nicht vollst ndig erfolgt, sondern das Montageelement m Kontakt mit seinem Verschraubungspartner bleibt. Dadurch wird ein Verrutschen verhindert und ein Neuansetzen vermieden . Weitere vorteilhafte Ausgestaltungen gehen aus der nachfolgenden Beschreibung, Zeichnungen sowie den Ansprüchen hervor.The method according to the invention is advantageously further developed by loosening the screwing process only up to a certain second lower threshold value of the torque. The second threshold value can be used to ensure that the assembly element is not completely loosened, but rather that the assembly element remains in contact with its screwing partner. This prevents slipping and prevents repositioning. Further advantageous configurations emerge from the following description, drawings and the claims.
Zeichnungendrawings
Es zeigt:It shows:
Figur 1 den Zusammenhang zwischen Drehmoment und Montagewinkel bei der herkömmlichen drehmomentkontrollierten Verschraubung;Figure 1 shows the relationship between torque and mounting angle in the conventional torque-controlled screw connection;
Figur 2 den Zusammenhang zwischen Drehmoment und Montagewinkel bei sukzessiv durchgeführter drehmoment- und winkelkon- trollierter Verschraubung.Figure 2 shows the relationship between torque and mounting angle with successively carried out torque and angle-controlled screw connection.
Ausführungsbeispieleembodiments
Figur 1 zeigt den Zusammenhang zwischen Drehmoment, aufgetragen auf der y-Achse 1 und dem Drehwinkel, um den das Montageelement gedreht wird, im folgenden Montagewinkel genannt, aufgetragen auf der x-Achse 2 bei der herkömmlichen drehmomentkontrollierten Verschraubung. Je nach der Reibung zwischen den Verschraubungsflachen des Montageelements und seines Verschraubungspartners kommt es bei Erreichen des Drehmomentsollwerts 3, in diesem Beispiel 50 Nm, zu unterschiedlichen Montagewinkeln . In dem Diagramm sind mehrere Montagekurven 4 dargestellt, welche das gemessene Drehmoment bei einem bestimmten Montagewinkel für verschiedene Einschraubvorgänge zeigen.Figure 1 shows the relationship between torque, plotted on the y-axis 1 and the angle of rotation by which the mounting element is rotated, hereinafter referred to as the mounting angle, plotted on the x-axis 2 in the conventional torque-controlled screw connection. Depending on the friction between the screwing surfaces of the mounting element and its screwing partner, different mounting angles occur when the torque setpoint 3 is reached, in this example 50 Nm. The diagram shows a number of assembly curves 4 which show the measured torque at a specific assembly angle for various screwing-in processes.
Die Steigungen der eingezeichneten Montagekurven 4 ergeben sich aufgrund verschiedener Reibungen zwischen den Schraubflächen des Montagelements und seines Verschraubungspartners, Schmiermittel, Oberflächenbeschaffenheiten, Fertigungstoleranzen u.s.w., auf die praktisch kein Einfluss genommen werden kann. In diesem Beispiel entsteht eine erhebliche Streubreite 5 der Montagewinkel.The slopes of the assembly curves 4 shown result from various friction between the screw surfaces of the assembly element and its screwing partner, lubricants, surface properties, manufacturing tolerances, etc., on which practically no influence can be exerted. In this example, there is a considerable spread 5 of the mounting bracket.
Figur 2 zeigt den Zusammenhang zwischen Drehmoment, aufgetragen auf der y-Achse 11 und Montagewinkel, aufgetragen auf der x-Achse 12 bei sukzessiv durchgeführter drehmoment- und winkelkontrollier- ter Verschraubung. Die Steigungen der Montagekurven 14 entsprechen denen in Figur 1, jedoch sind die Kurven so verschoben, dass der Bezugswinkel 16 für alle Kurven bei einem bestimmten Drehmoment 13 liegt, sich die Kurven also nicht wie in Figur 1 in dem Punkt schneiden, an dem das Drehmoment und der Montagewinkel den Wert 0 haben.FIG. 2 shows the relationship between the torque, plotted on the y-axis 11 and the mounting angle, plotted on the x-axis 12, with the torque and angle-controlled screw connection being carried out successively. The slopes of the mounting curves 14 correspond to those in FIG. 1, but the curves are shifted such that the reference angle 16 for all curves is at a specific torque 13, that is to say the curves do not intersect at the point at which the torque as in FIG. 1 and the mounting bracket has the value 0.
Die Montagelemente werden zunächst nur bis zu einem Drehmomentschwellwert 13 gedreht, in diesem Beispiel 10 Nm, anschließend um einen vorgegeben Winkel 17, hier 12 Grad, weitergedreht. Die Streubreite der Montagewinkel 15 ist deutlich kleiner, da sie mit dem kleineren Drehmomentschwellwert 13 zusammenhängt. The assembly elements are initially only rotated up to a torque threshold value 13, in this example 10 Nm, and then rotated further by a predetermined angle 17, here 12 degrees. The spread of the mounting bracket 15 is significantly smaller because it is related to the smaller torque threshold 13.

Claims

A N S P R U C H E EXPECTATIONS
1. Schraubwerkzeug zum kontrollierten Einschrauben von schraubbaren Montageelementen umfassend eine Schraubspindel und einen Drehmomentmesser, dadurch gekennzeichnet, dass das Schraubwerkzeug einen Winkelmesser umfasst, sodass nach Erreichen eines Drehmomentschwellwerts das Schraubwerkzeug zusätzlich um einen definierten Winkel weitergedreht wird.1. Screwing tool for the controlled screwing in of screwable assembly elements comprising a screw spindle and a torque meter, characterized in that the screwing tool comprises a protractor, so that after a torque threshold value is reached, the screwing tool is additionally rotated through a defined angle.
2. Schraubwerkzeug gemäß Anspruch 1, dadurch gekennzeichnet, dass das Schraubwerkzeug eine Kontrolleinheit umfasst, die die Eingabe von mindestens einem Drehmomentschwellwert und mindestens einem Drehwinkel und oder die Anzeige des momentanen Drehmoments sowie Drehwinkels ermöglicht. 2. Screwing tool according to claim 1, characterized in that the screwing tool comprises a control unit which enables the input of at least one torque threshold value and at least one angle of rotation and or the display of the instantaneous torque and angle of rotation.
3. Schraubwerkzeug gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Schraubwerkzeug eine Steuereinheit umfasst, die einen sukzessiven Ablauf von drehmomentkontrolliertem und winkelkontrolliertem Einschrauben erlaubt . 3. Screwing tool according to one of the preceding claims, characterized in that the screwing tool comprises a control unit which allows a successive sequence of torque-controlled and angle-controlled screwing.
4. Verfahren zum kontrollierten Einschrauben von schraubbaren Montageelementen mit einem Schraubwerkzeug, das eine Schraubspindel und ein Drehmomentmesser umfasst, dadurch gekennzeichnet, dass - ein Drehmomentschwellwert (15) und ein definierter Winkel (16), der größer als 0 Grad ist, vorgegeben werden, - das Montageelement bis zu einem Drehmomentschwellwert (15) eingedreht wird, - das Montageelement um den definierten Winkel (16) weiter eingedreht wird.4. Method for the controlled screwing in of screwable assembly elements with a screwing tool, which comprises a screw spindle and a torque meter, characterized in that a torque threshold value (15) and a defined angle (16), which is greater than 0 degrees, are specified, the mounting element is screwed in up to a torque threshold (15), - the mounting element is screwed in further by the defined angle (16).
5. Verfahren zum kontrollierten Einschrauben von schraubbaren Montageelementen mit einem Schraubwerkzeug, das eine Schraubspindel und ein Drehmomentmesser umfasst, dadurch gekennzeichnet, dass - ein Drehmomentschwellwert (15) und ein definierter Winkel (16) vorgegeben werden, - das Drehmoment gemessen wird, - das Montageelement bis zu einem Drehmomentschwellwert (15) eingedreht wird, - das Montagelement wieder gelöst wird, - das Montageelement wieder bis zu einem Drehmomentschwellwert (15) eingedreht wird, - das Montageelement um den definierten Winkel (16) weiter eingedreht wird.5. Method for the controlled screwing in of screwable assembly elements with a screwing tool, which comprises a screw spindle and a torque meter, characterized in that - a torque threshold value (15) and a defined angle (16) are specified, - the torque is measured, - the assembly element is screwed in up to a torque threshold (15), - the mounting element is loosened again, - the mounting element is screwed in again up to a torque threshold (15), - the mounting element is screwed in further by the defined angle (16).
6. Verfahren zum kontrollierten Einschrauben von schraubbaren Montageelementen mit einem Schraubwerkzeug, das eine Schraubspindel und ein Drehmomentmesser umfasst, dadurch ge- kennzeichnet, dass - ein erster oberer Drehmomentschwellwert, ein zweiter unterer Drehmomentschwellwert und ein definierter Winkel vorgegeben werden,6. Method for the controlled screwing in of screwable assembly elements with a screwing tool, which comprises a screw spindle and a torque meter, characterized in that a first upper torque threshold value, a second lower torque threshold value and a defined angle are specified,
- das Drehmoment gemessen wird, - das Montageelement bis zu einem ersten oberen Drehmomentschwellwert (15) eingedreht wird,- the torque is measured, - the assembly element is screwed in up to a first upper torque threshold value (15),
- das Montag re&lement bis zu einem zweiten unteren Drehmomentschwellwert gelöst wird,- the Monday re & lement is released up to a second lower torque threshold,
- das Montageelement wieder bis zu einem ersten oberen Dreh- momentschwellwert (15) eingedreht wird,- The assembly element is screwed in again up to a first upper torque threshold (15),
- das Montageelement um den definierten Winkel (16) weiter eingedreht wird. - The mounting element is screwed in further by the defined angle (16).
PCT/DE2004/001117 2003-07-28 2004-06-02 Screwing tool for screwing in sensitive parts, and method therefor WO2005014232A1 (en)

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