WO2021191198A1 - Dispositif de serrage - Google Patents

Dispositif de serrage Download PDF

Info

Publication number
WO2021191198A1
WO2021191198A1 PCT/EP2021/057407 EP2021057407W WO2021191198A1 WO 2021191198 A1 WO2021191198 A1 WO 2021191198A1 EP 2021057407 W EP2021057407 W EP 2021057407W WO 2021191198 A1 WO2021191198 A1 WO 2021191198A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping
prism
clamping device
distance
jaws
Prior art date
Application number
PCT/EP2021/057407
Other languages
German (de)
English (en)
Inventor
Ralf Klerks
Original Assignee
Ralf Klerks
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ralf Klerks filed Critical Ralf Klerks
Publication of WO2021191198A1 publication Critical patent/WO2021191198A1/fr

Links

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
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/103—Arrangements for positively actuating jaws using screws with one screw perpendicular to the jaw faces, e.g. a differential or telescopic screw
    • 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
    • B25B1/00—Vices
    • B25B1/20—Vices for clamping work of special profile, e.g. pipes
    • 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
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws

Definitions

  • the invention relates to a clamping device, in particular for gripping and clamping round bodies during machining.
  • machining stations with robots which can grip workpieces and guide them to a machine tool.
  • Workpieces are usually held with clamping devices, for which there are different designs in the field of clamping technology.
  • clamping devices are known which are used in industrial practice when gripping round material such as rods with circular diameters. Clamping devices are used in which two clamping jaws face each other in the form of prisms. The round material is placed between these prisms.
  • the use of two prisms leads to a total of four contact points on the bar material, so that, due to tolerances, it is not possible to align the prism jaws exactly to one another, which in practice can lead to strong tilting of the round material.
  • clamping devices are known in which the clamping jaws produce a complete form fit to the round material, so that such a device can, however, only be used for a single diameter. It is also possible to clamp against a straight surface using a prism, but the clamping center changes the diameter of the round material accordingly, so that a calibration of the zero point position is required when gripping, especially when gripping with robot arms.
  • a machine vise is known from EP 0 411 472 A1, in which the central planes can be adjusted relative to the base plate of the machine vise.
  • the machine vice includes a device in which a power amplifier is provided for each of the clamping jaws, which can be driven by a common crank.
  • a centric clamping device for centric clamping of workpieces.
  • the centric tensioner has a base carrier on which a first jaw carrier is guided through a first slide and a second jaw carrier is guided through a second slide and is mounted adjustably by means of a spindle drive along an adjustment path oriented parallel to the longitudinal axis.
  • a pair of first runners are assigned to the first slide and a pair of second runners to the second slide, the difference between the track width of the first runners and the track width of the second runners being greater than the width of the second runners.
  • a clamping device in particular for gripping and clamping round bodies in machining, which comprises a clamping prism and a clamping jaw, which can be pushed together on a guide rail along a displacement axis relative to each other, the clamping prism two with respect to the Verie note has mirror-symmetrical legs, the opening of which points in the direction of the clamping jaw, the clamping prism being displaceable along the displacement axis by a first distance and at the same time the clamping jaws along the displacement axis by a second distance by means of a drive to accommodate a workpiece, the ratio of the The first distance to the second distance in relation to the opening angle of the legs of the clamping prism is selected so that workpieces of different diameters lie at the same point between the clamping prism and the clamping jaws with respect to their central axis formed inside the circle.
  • the workpiece is clamped at three support points, so that a tilt-free mounting in the clamping device is possible even for workpieces with tolerances.
  • the two points of support on the clamping prism move, however, starting from their completely closed zero position with an enlargement of the opening width of the clamping device at a greater speed than the point of support on the clamping jaws.
  • the ratio of the two distances covered is selected in such a way that when workpieces with a circular cross-section are clamped, their center points remain unchanged even when different diameters are set.
  • a robot gripper arm therefore does not need to recalibrate the zero point when processing workpieces with different diameters, since the center points of the circular cross-sections are always at the same point.
  • the center points are oriented along a central axis.
  • Different devices are conceivable as the drive, which are explained in more detail below. It is important, however, that the ratio of the first distance to the second distance depends only on the opening angle of the legs of the clamping prism, so that the ratio can be selected accordingly for a given clamping prism. The ratio in particular does not vary with the diameter of the workpieces.
  • the relationship between the two distances can be derived as shown. This relationship also follows the intuitive idea that when the cross-section of the workpiece to be clamped changes, the clamping prism has to cover a greater distance than the clamping jaw. The smaller the opening angle of the clamping prism is selected, the greater the difference in the distances will be compared to the clamping jaws. If both legs are on one line, ie the opening angle is 180 °, the clamping prism becomes the clamping jaw and the ratio is one.
  • the clamping jaws and the clamping prism are adjustable by means of a spindle drive which has different thread pitches for the clamping jaws and the clamping prism, which follow the ratio of the first speed to the second speed. At least the clamping prism and the part of the spindle drive assigned to the clamping prism can be interchangeable.
  • a spindle drive is a common way of adjusting a clamping device, with the different thread pitches ensuring different distances covered by the clamping prism and clamping jaws. If differently shaped clamping prisms are to be provided, at least the part of the spindle drive assigned to the clamping prism should be able to be touched in order to take into account the changed opening angle of the legs of the clamping prism.
  • a motor drives the clamping jaws and the clamping prism via a gear.
  • the different distances covered by the clamping prism and clamping jaws are generated by means of a gear unit of a motor.
  • the gear ratios follow the ratio of the two routes described above.
  • a first motor drive the clamping jaws and a second motor drives the clamping prism, the speeds of which follow the ratio of the first speed to the second speed.
  • two motors can be used in an alternative embodiment, which are operated at different speeds.
  • the clamping jaw and the clamping prism are adjustable by means of a wedge clamping drive which has different wedge angles for the clamping jaw and the clamping prism, which follow the ratio of the first speed to the second speed. At least the clamping prism and the part of the wedge clamping drive assigned to the clamping prism can be interchangeable.
  • the clamping device can be exchanged after the clamping jaw and the clamping prism and the clamping jaw can be detachably fastened by means of fastening means.
  • fastening means can be used if necessary, which have a laterally arranged or offset prism together with the associated jaws.
  • wedge clamping drives are also in use in known Spannvor devices, with which the inven tion can also be used without any problems, the different setting of clamping prism and jaws being carried out by means of appropriately adapted wedges.
  • the clamping jaw is wedge-shaped with a contact edge on the wedge tip which points in the direction of the clamping prism.
  • the angle at the wedge tip can be selected so that the clamping jaw and the clamping prism can be pushed completely into one another.
  • the clamping jaw has a flat contact surface running perpendicular to the displacement axis.
  • the clamping jaw can also be designed as a flat contact surface, which also enables the workpiece to be clamped without tilting in the event of workpiece tolerances.
  • the clamping jaw has a point-like contact point running perpendicular to the displacement axis.
  • Figure 1 shows a clamping device according to the invention in a perspective side view in a first embodiment
  • Figure 2 shows a clamping device according to the invention in a perspective side view in a second embodiment
  • Figure 3 shows a clamping device according to the invention in a perspective side view in a third embodiment.
  • FIG. 1 a first embodiment of a clamping device 2 is shown, which is described in more detail below.
  • the clamping device 2 comprises egg NEN clamping jaws 4 which is opposite to a clamping prism 6 angeord net.
  • the clamping prism 6 has legs 10 symmetrically to a displacement axis 8, which form an opening angle. The opening angle is shown in FIG. 1 with the reference number 12.
  • a workpiece 14 can be introduced, which is designed as a round bar in the example shown.
  • the workpiece 14 therefore has an essentially cylindrical outer shape about a central axis 16. Since the workpiece 14 is only held at three points or contact edges in the Spannvorrich device 2, smaller component tolerances cannot cause the workpiece 14 to tilt.
  • An essential idea of the invention is that as the diameter of the workpiece 14 increases, the central axis 16 remains unchanged in its position relative to the clamping device 2. This is achieved in that the clamping jaws 4 and the clamping prism 6 move relative to one another by means of a drive 18 in guide rails 20, whereby when the clamping device 2 is opened, the clamping prism 6 covers a first distance at the same time that is greater than the second distance of the clamping jaw 4 is. When closing the clamping device 2, of course, corresponding steps are taken so that the clamping jaws 4 and clamping prism 6 could meet at the location of the central axis 16.
  • the ratio of the first distance to the second distance depends only on the opening angle 12, so that once the opening angle is selected Angle 12 of the legs 10 on the clamping prism 6 a fixed setting can be made.
  • the drive 18 is designed in the form of a spindle drive, only the spindle half 22 assigned to the clamping prism 6 and the spindle half 24 assigned to the clamping jaw 4 being shown in FIG.
  • the spindle half 22 and the spindle half 24 are provided with different thread pitches, the ratio of which follows the above-mentioned ratio of the first line to the second line. In this way, at a constant rotational speed, a different speed of the movement of the clamping prism 6 compared to the clamping jaw 4 can be generated.
  • the clamping jaw 4 has a wedge tip 28 on its side assigned to the clamping prism 6, the shape of which can be selected so that the clamping jaw 4 and the clamping prism 6 can be moved towards one another up to the central axis 16, so that even very small workpieces 14 can pass through the clamping device 2 can be held.
  • the ratio of the first distance to the second distance is only dependent on the opening angle 12 of the legs 10 of the clamping prism 6, the ratio of the first distance to the second distance as a calculation based on simple geometric relationships
  • the clamping device 2 is provided here with a wedge clamping drive, in which differently shaped wedge surfaces for different movement speeds with respect to the clamping prism 6 and on the clamping jaws 4, so that the central axis 16 of the workpiece 14 remains unchanged when there are different diameters.
  • the clamping jaw 4 in the clamping device 2 according to FIG. 2 has a flat contact surface 30 instead of the wedge tip 28. In addition to a planar contact surface 30, it would also be possible to use a single contact point so that the workpiece 14 is only held in a point-like manner on the clamping jaw 4.
  • clamping device 2 which is designed in the form of a gripper.
  • the clamping jaw 4 and the clamping prism 6 have upwardly projecting segments 32 and 34, which can be moved towards one another as described above.
  • the drive 18 required for this is only indicated schematically here.
  • clamping jaws 4 or prisms can be used, which are also laterally offset, for example, so that the central axis 16 of the workpiece 14 was in a predetermined position, for example to the longitudinal axes of the spindle halves 22, 24 of the spindle drive is arranged.
  • Such special forms of the clamping jaw 4 or the clamping prism 6 are familiar to the person skilled in the art.
  • clamping jaws 4 or clamping prism 6 by means of, for example, detachable screw connections designed fastening means 36, which are shown in Fig. 2 and 3 for both the clamping jaws 4 and 6 for the clamping prism 6, can be made replaceable .
  • the drive 18 can also take place in other ways. It would be conceivable to move the clamping jaw 4 and the clamping prism 6 by means of an electric motor and differently graded gears. It would also be conceivable to provide two motors for the clamping jaws 4 and the clamping prism 6, which are correct in their rotational speed according to each other torque.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

L'invention se rapporte à un dispositif de serrage, en particulier pour saisir et serrer des corps ronds lors d'un traitement mécanique, lequel dispositif de serrage comprend un prisme de serrage (6) et une mâchoire de serrage (4) qui peuvent être déplacés ensemble sur un rail de guidage (20) le long d'un axe de déplacement (8) l'un par rapport à l'autre, le prisme de serrage (6) ayant deux branches (10), qui présentent une symétrie spéculaire par rapport à l'axe de déplacement (8), dont l'ouverture est orientée dans la direction de la mâchoire de serrage (4). Afin de recevoir une pièce à travailler (14), le prisme de serrage (6) est mobile le long de l'axe de déplacement (8) d'une première distance et, en même temps, la mâchoire de serrage (4) est mobile le long de l'axe de déplacement (8) d'une seconde distance au moyen d'un entraînement (18), le rapport entre la première distance et la seconde distance par rapport à l'angle d'ouverture (12) des membres (10) du prisme de serrage (6) étant choisi de telle sorte que des pièces à travailler (14) de différents diamètres se trouvent au même emplacement entre le prisme de serrage (6) et la mâchoire de serrage (4) par rapport à l'axe central (16) desdites pièces à travailler formées à l'intérieur du cercle.
PCT/EP2021/057407 2020-03-23 2021-03-23 Dispositif de serrage WO2021191198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020107967.2A DE102020107967A1 (de) 2020-03-23 2020-03-23 Spannvorrichtung
DE102020107967.2 2020-03-23

Publications (1)

Publication Number Publication Date
WO2021191198A1 true WO2021191198A1 (fr) 2021-09-30

Family

ID=75339692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/057407 WO2021191198A1 (fr) 2020-03-23 2021-03-23 Dispositif de serrage

Country Status (2)

Country Link
DE (1) DE102020107967A1 (fr)
WO (1) WO2021191198A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB775111A (en) * 1954-06-23 1957-05-22 Douglas Fraser & Sons Ltd Self-centering mechanism for locating components of nominally circular cross-section
DE8712844U1 (de) * 1986-09-23 1988-04-14 Josef Pradler, Konstruktionsbüro, 73230 Kirchheim Spanneinrichtung
EP0411472A1 (fr) 1989-08-03 1991-02-06 Saurer-Allma GmbH Dispositif sur des étaux de machines pour serrer et centrer des pièces à usiner
DE202008001563U1 (de) * 2008-02-05 2008-04-17 Hüttenhölscher Maschinenbau GmbH Verfahrbare Spanneinrichtung für Werkstücke
EP2839928A1 (fr) 2013-08-22 2015-02-25 Röhm GmbH Étau centrant
DE102014007980A1 (de) * 2014-06-15 2015-12-17 Hans Krissler Mittelachsen oder Oberkanten von zylindrischen Teilen die in prismatischen Aufnahmen liegen können mit einer Spindel und einer Stellungsanzeige auf gleiches Niveau eingestellt werden wenn Gewindesteigung Fall A 1,5/Fall B 1,25 und Prismenwinkel=2*arcsin(1
WO2018165141A1 (fr) * 2017-03-10 2018-09-13 Arobotech Systems, Inc. Ensemble de fixation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7402142U (de) 1974-05-16 Floeter H Spanneinheit mit paarweise unabhängig von einander arbeitenden Spannbacken
DE19936453A1 (de) 1999-08-03 2001-02-08 Bessey & Sohn Spanneinrichtung für parallele und winklige Teile

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB775111A (en) * 1954-06-23 1957-05-22 Douglas Fraser & Sons Ltd Self-centering mechanism for locating components of nominally circular cross-section
DE8712844U1 (de) * 1986-09-23 1988-04-14 Josef Pradler, Konstruktionsbüro, 73230 Kirchheim Spanneinrichtung
EP0411472A1 (fr) 1989-08-03 1991-02-06 Saurer-Allma GmbH Dispositif sur des étaux de machines pour serrer et centrer des pièces à usiner
DE202008001563U1 (de) * 2008-02-05 2008-04-17 Hüttenhölscher Maschinenbau GmbH Verfahrbare Spanneinrichtung für Werkstücke
EP2839928A1 (fr) 2013-08-22 2015-02-25 Röhm GmbH Étau centrant
DE102014007980A1 (de) * 2014-06-15 2015-12-17 Hans Krissler Mittelachsen oder Oberkanten von zylindrischen Teilen die in prismatischen Aufnahmen liegen können mit einer Spindel und einer Stellungsanzeige auf gleiches Niveau eingestellt werden wenn Gewindesteigung Fall A 1,5/Fall B 1,25 und Prismenwinkel=2*arcsin(1
WO2018165141A1 (fr) * 2017-03-10 2018-09-13 Arobotech Systems, Inc. Ensemble de fixation

Also Published As

Publication number Publication date
DE102020107967A1 (de) 2021-09-23

Similar Documents

Publication Publication Date Title
WO1990002633A2 (fr) Dispositif de serrage
DE2533609A1 (de) Vorrichtung zum selbsttaetigen paarweisen verloeten von draehten auf kontaktpositionen von schaltungskarten und aehnlichen traegern von schaltungen
AT390025B (de) Vorrichtung zum herstellen prismatischer oder pyramidenstumpffoermiger balken
DE4207437C2 (de) Spannvorrichtung
DE1453213C3 (fr)
WO2021191198A1 (fr) Dispositif de serrage
DE10331338B4 (de) Automatisches Positioniersystem
DE102004055355A1 (de) Spannvorrichtung
DE3103722C2 (de) Anschlagvorrichtung für Holzbearbeitungsmaschinen
EP0787560A1 (fr) Dispositif d'usinage des barres, des profilés et similaire
DE3246533A1 (de) Spannvorrichtung zur bearbeitung von werkstuecken
DE3918365A1 (de) Ultra-praezisionsschleifmaschine
DE2700386A1 (de) Plattenaufteilsaege
DE3930463C2 (fr)
DE3411991C2 (de) Positionierverfahren und Positioniereinrichtung zum Positionieren von Trägern für Werkstücke, Werkzeuge o. dgl. an Handhabungsvorrichtungen
EP0603625A1 (fr) Dispositif pour la coupe en longueur de profilés creux
EP0033531B1 (fr) Mâchoires pour le serrage à angle précis de pièces à usiner
EP2998065B1 (fr) Dispositif de traitement dote d'une table porte-piece
EP1245319A2 (fr) Support tournant pour scie circulaire
DE127809C (fr)
DE4123492C3 (de) Mehrfach-Spannvorrichtung
DE4223094A1 (de) Vorrichtung zum Einbringen von paßgenauen Bohrungen in Nummernschilder für Kraftfahrzeuge
DE684896C (de) Einspannvorrichtung fuer elektrische Stumpfschweissmaschinen mit zwei Spannbackenpaaren
DE3733454A1 (de) Gestell zur bearbeitung von kabelschaechten mit einer elektromotorisch betriebenen handstichsaege
DE2551344C3 (de) Winkeleinstellvorrichtung, insbesondere für Maschinenschraubstöcke

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21715805

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21715805

Country of ref document: EP

Kind code of ref document: A1