EP2874804B1 - Cam drive - Google Patents

Description

The invention relates to a wedge drive with slider element receptacle, at least one movable slide carriage, at least one driver element and with sliding surfaces between the at least one slide slide and the at least one driver element.

Such a wedge drive is from the DE 10 2007 045 703 A1 known.

This document also describes that a wedge drive, also referred to as a slider, basically serves for the deflection of pressing forces in punching or forming tools in order to be able to cut, punch or deform through these, in particular, oblique or backward portions of body parts. The wedge drive comprises at least the above elements. The rigid slider element receptacle is connected to a part of the press or of the press tool in order to be able to carry out the punching or forming work by means of the wedge drive.

In this case, a wedge drive is called upper slide when its slide element receptacle is fixed in the upper part of the press tool connected to the moving press ram.

A lower slide is then spoken of when the slide element receptacle is connected to the lower press tool fastened to the rigid press table.

However, it is independent of this that the slider element receiving the wedge drive usually has a linear guide in which the movable slide element can reciprocate.

Usually, the driver element is connected as a rigid element fixed to the part of the press tool to which the slider element receptacle is not attached.

The linear guide in the slider element holder should bear the movable slide element as free of play as possible and thereby high press forces and realize high punching times. In order to allow one degree of free cutting or punching of a workpiece, a tolerance of the running accuracy of the movable slide element of at most 0.02 mm is currently required.

Failure to comply with this tolerance means that the workpieces can no longer be placed precisely on top of each other so that faults occur in the body shop.

To ensure the required running accuracy, a variety of concepts have been developed, but all of which do not yet ensure the desired accuracy, or are very expensive to manufacture.

The invention is therefore based on the object of specifying a wedge drive of the type mentioned, which ensures a high degree of running accuracy with technically simple means and at the same time minimizes the manufacturing cost and running time.

This object is achieved according to the wedge drive of the type mentioned in the present invention that at least one clamping device is present at least one sliding surface, which simulates the pressing force adjustable during assembly of the working tool for producing a backlash between the at least one slide slide and the at least one slide holder.

The gist of the invention is that by simulating the pressing force on the wedge drive, a 0.02 mm clearance tolerance is not only achieved but even improved to 0.00 mm.

The reason is that the mutually movable parts by means of the clamping device so firmly pressed by the simulated pressing force on each other that the desired goal of very little backlash of 0.02 mm and even 0.00 mm is reached and attached to the working tool becomes.

Certainly, there are a variety of ways to initiate the desired force in the wedge drive. It is advantageous, however, when a clamping screw is used as a clamping device.

A development of the invention provides that the clamping screw is arranged in a plane which is perpendicular to the respective sliding surfaces, and the clamping screw is arranged in this plane perpendicular or inclined to the vertical.

As a result, not only in the slip plane but also perpendicular thereto a sufficient force acts on the sliding surface to ensure freedom from play.

In this case, it is advantageous if the force vector generated by the clamping screw, which approximately corresponds to that of the pressing force, in each case at least one first vector triangle perpendicular to the plane of the sliding surface and a second in the plane of the at least one sliding surface or parallel thereto Power triangle vector is split.

According to an advantageous embodiment of the invention, it is provided that the clamping device generates a compressive or tensile stress.

If larger sliding surfaces meet, it is advantageous if several clamping devices per sliding surface are present.

As a result, the introduction of force can be better distributed over the large areas.

Thus, the once set position can always be kept safe, it is advantageous that the set position of the clamping device can be fixed by the working tool.

A development of the invention provides that the inclination of the clamping screw clamps the Endstellungspassstück backlash.

An additional support for the low backlash, but mainly for a long term, it is advantageous if the sliding surfaces each have a sintered metal bearing surface, is stored in the solid lubricant.

A further assurance of the low backlash is given when a dovetail-like or prism guide means is arranged between the slide carriage and the slider element receiving.

Fig.1

eine Draufsicht auf einen Prismen-Führung-Schieberschlitten;

Fig.2

eine Draufsicht auf einen entsprechenden Treiber des Schieberschlittens gemäß Fig.1;

Fig.3

zwei Ansichten eines weiteren Keiltriebs, dabei einmal im geschnittenen Zustand mit der Presskraftangabe und einmal im ungeschnittenen Zustand mit der Presskraft (F_P) die später durch die Spanneinrichtung ersetzt wird;

Fig.4

eine der Fig.3 ähnliche Ausführungsform anderer Keiltriebe;

Fig.5

eine geschnittene Skizze in Draufsicht zur Darstellung der Schlittenspannung und der Wirkung der Spannschraube;

Fig.6

eine der Fig.5 ähnliche Schnittdraufsicht mit einer anderen Krafteinleitung; und

Fig.7

eine letzte Ausführungsform zur Darstellung der Spannkraft eines weiteren Keiltriebs.

Further advantages and features of the invention will become apparent from the following description with reference to several different wedge drives, which are set in the same way under tension. This description will be made with reference to the figures, which show:

Fig.1

a plan view of a prism guide slide carriage;

Fig.2

a plan view of a corresponding driver of the slide carriage according to Fig.1 ;

Figure 3

two views of a further wedge drive, this once in the cut state with the press force and once in the uncut state with the pressing force (F _P ) which is later replaced by the clamping device;

Figure 4

one of the Figure 3 similar embodiment of other wedge drives;

Figure 5

a sectional sketch in plan view showing the carriage tension and the effect of the clamping screw;

Figure 6

one of the Figure 5 similar sectional top view with a different force introduction; and

Figure 7

a final embodiment for illustrating the clamping force of another wedge drive.

Based on FIGS. 1 to 7 Now, the effects and arrangements of the clamping devices 20 are described in more detail on various wedge drives 10. The same reference numerals mean the same or similar features, unless stated otherwise.

As already described in the introduction, each wedge drive 10, which is shown here in the figures, consists of a slider element receptacle 12, at least one movable slide carriage, at least one driver element 16 and sliding surfaces 18 joined therebetween.

In order to be able to attach the corresponding tools to the wedge drives 10 with maximum accuracy and with a clearance of at most 0.01 mm, the sliding surfaces 18 between the slide carriages 14 and the driver elements 16 are acted upon by at least one clamping device 20 with the pressing force F _P. This pressing force is of course adjustable and simulated to produce the backlash between the slide carriage 14 and the slide holder 22, the pressing force F _P.

The simulated pressing force F _P is of course similar in size to the actual then acting in operation pressing force F _P and presses the two sliding faces so tightly that no more than a clearance of 0.01 mm between these units is present.

In this state, any working tool is then connected, which then fixes the corresponding positions to the other accompanying elements at the same time.

Of course, for the operation or the use of the wedge drive 10 each clamping screw 20 must be removed. This setting virtually eliminates the possibility for the tool elements to exceed the desired tolerance. Of course, after a certain period of time, which is significantly extended in these embodiments, however, to the prior art, also the necessity of replacing the work tools on.

In order to simulate the correct compressive stress F _P , the clamping screw 20 is arranged in a plane which is perpendicular to the respective sliding surfaces 18 and the clamping screw 20 is arranged in this plane perpendicular or perpendicular to the vertical.

In this case, the different inclinations to the different wedge drives 10 are based on the corresponding points of application and vectors of the pressing force F _P.

The force vector vectors F ₁ and F ₂ occurring in the application of the clamping force F _S run once perpendicular to the sliding surface and on the other parallel to it. This gives an even better assembly of the sliding elements to each other.

The clamping force F _S corresponds to the pressing force F _P , so that the actual state for the production can be set clean.

Depending on the arrangement of the clamping screw 20 generates this with respect to the wedge drive 10 seen tensile force to the outside, as in the FIGS. 5 to 7 shown, or a compressive force in the direction of the wedge drive 10, as for example in Figure 4 is shown.

If very large sliding surfaces 18 are present, then 18 more clamping devices or clamping screws 20 can be used per sliding surface 18.

Furthermore, the inclination of the clamping screw 20 for play-free clamping of Endstellungspassstückes 26. In order that the desired backlash is maintained as long as possible, the sliding surfaces 18 each have a sintered metal support surface, is stored in the solid lubricant.

Another support for maintaining the low clearance is given when a dovetail-like or prism guide means is disposed between the slide carriage 14 and the slider element receptacle 12.

According to the invention, it is therefore possible with the help of the clamping device or clamping screws in the assembly of the working tools on the wedge drives 10 to achieve maximum accuracy and also an extension of the term.

LIST OF REFERENCE NUMBERS

10

cotter

12

Slider element receiver

14

slide slide

16

driving element

18

sliding surfaces

20

Clamping device / clamping screw

22

spool location

24

Prism guide means

26

Endstellungspassstück

F _P

pressing force

F _S

tension

F ₁

first power triangle vector

F ₂

second power triangle vector

Claims (10)

1. Wedge drive (10) having a pusher element receiver (12), at least one moveable pusher carriage (14), at least one driver element (16) and having sliding surfaces (18) between the at least one pusher carriage (14) and the at least one driver element (16), characterised in that at least one clamping device (20) is provided for at least one sliding surface (18) and simulates the pressing force (F_P) in an adjustable manner during assembly of the working tool in order to achieve an absence of play between the at least one pusher carriage (14) and the at least one pusher receiver (22).
2. Wedge drive (10) as claimed in claim 1, characterised in that the clamping device is a clamping screw (20).
3. Wedge drive (10) as claimed in claim 2, characterised in that the clamping screw (20) is disposed in a plane which extends perpendicularly with respect to the respective sliding surfaces (18), and the clamping screw (20) is disposed perpendicularly in this plane or in an inclined manner with respect to the vertical.
4. Wedge drive (10) as claimed in claim 3, characterised in that the force vector (F_S) produced by the clamping screw (20), which approximately corresponds to that of the pressing force (F_P), is divided respectively into a first triangle of forces vector (F₁) extending perpendicularly with respect to the plane of the sliding surface (18) and a second triangle of forces vector (F₂) extending in the plane of the at least one sliding surface (18) or parallel thereto.
5. Wedge drive (10) as claimed in any one of claims 1 to 4, characterised in that the clamping device (20) produces a compressive stress or a tensile stress.
6. Wedge drive (10) as claimed in any one of claims 1 to 5, characterised in that a plurality of clamping devices (20) are provided per sliding surface (18).
7. Wedge drive (10) as claimed in any one of claims 1 to 6, characterised in that the adjusted position of the clamping device (20) can be fixed by the working tool.
8. Wedge drive (10) as claimed in any one of claims 3 to 7, characterised in that the inclined position of the clamping screw (20) clamps the end position fitting piece (26) in a play-free manner.
9. Wedge drive (10) as claimed in any one of claims 1 to 8, characterised in that the sliding surfaces (18) each comprise a sintered metal support surface in which the solid lubricant is incorporated.
10. Wedge drive (10) as claimed in any one of claims 1 to 9, characterised in that a dovetailed or prismatic guide device is disposed between the pusher carriages (14) pusher element receiver (12).

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