EP4543631A1 - Dispositif de serrage central pour maintenir par serrage des pièces à usiner - Google Patents

Dispositif de serrage central pour maintenir par serrage des pièces à usiner

Info

Publication number
EP4543631A1
EP4543631A1 EP22735416.4A EP22735416A EP4543631A1 EP 4543631 A1 EP4543631 A1 EP 4543631A1 EP 22735416 A EP22735416 A EP 22735416A EP 4543631 A1 EP4543631 A1 EP 4543631A1
Authority
EP
European Patent Office
Prior art keywords
clamping
jaws
center
clamping device
clamping jaws
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP22735416.4A
Other languages
German (de)
English (en)
Inventor
Dieter Mosig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hemo Ag
Original Assignee
Hemo Ag
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 Hemo Ag filed Critical Hemo Ag
Publication of EP4543631A1 publication Critical patent/EP4543631A1/fr
Pending legal-status Critical Current

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
    • B25B1/12—Arrangements for positively actuating jaws using screws with provision for disengagement
    • B25B1/125—Arrangements for positively actuating jaws using screws with provision for disengagement with one screw perpendicular to the jaw faces
    • 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
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws

Definitions

  • Center clamping device for clamping workpieces to be machined mechanically
  • the invention relates to a center clamping device for clamping workpieces to be machined mechanically and a method with the center clamping device according to the preambles of the independent claims.
  • Center clamping devices for clamping workpieces to be machined have become an integral part of mechanical production today. They form the center of the processing zone and have a significant influence on manufacturing precision. The requirements for such center clamping devices are varied. In addition to the basic requirements of high rigidity and good repeatability, there is also a need for the largest possible span range to be covered with a single clamping device. At the same time and in some contradiction to the latter need, it is also desirable that the center clamping devices require as little space as possible in the production zone. create as few defects as possible, e.g. B. Avoid unnecessarily long spindle projections, which increase the potential for collision with the machining tools and may require unnecessarily long machining tools.
  • the task is therefore to provide a technical solution with which the aforementioned deficit in the prior art can be reduced.
  • a first aspect of the invention relates to a center clamping device for clamping workpieces to be machined mechanically.
  • the center clamping device comprises a base body for fastening the device on the machine table of a machine tool, two clamping jaws arranged on the base body so that they can be moved along linear guides for clamping the workpiece, and a threaded spindle with two spindle nuts for moving the two clamping jaws relative to one another along the linear guides by rotating the Threaded spindle.
  • the spindle nuts are designed separately from the clamping jaws and each of the spindle nuts is assigned to exactly one of the two clamping jaws. According to the invention, different relative positions between the clamping jaws and the spindle nuts can be adjusted in the direction of displacement of the clamping jaw, so that different spans can be achieved with unchanged relative positions of the spindle nuts on the threaded spindle.
  • the relative positions between the clamping jaws and the spindle nuts in the direction of displacement of the clamping jaws can be adjusted without tools. As a result, no tool is required for changing the center clamping device to a different span range and one can therefore neither be lost nor forgotten in the machining zone.
  • the relative positions between the clamping jaws and the spindle nuts can be adjusted in fixed steps in the direction of displacement of the clamping jaws, preferably in a form-fitting manner, e.g. B. through positioning or locking bolts. In this way, the clamping forces can be transmitted safely and precisely.
  • the spindle nuts are guided in guides in the clamping jaws and are used to set the desired relative positions in the direction of displacement of the respective clamping jaw after loosening a connection or Fixation can be moved relative to the clamping jaw. This results in a compact and very rigid structure of the center clamping device.
  • the spindle nuts can be fixed in several defined relative positions with respect to the clamping jaws, in particular by means of positioning or locking bolts provided on the clamping jaws. In this way, the clamping forces can be transmitted safely and precisely through positive locking and no additional components are required that could get lost.
  • the clamping jaws can be removed, advantageously without tools, from the base body and from the spindle nuts and can then be arranged again on the guides of the base body in a 180 ° rotated position and connected to the spindle nuts in several defined relative positions, and although advantageously by means of positioning or locking bolts provided on the clamping jaws.
  • the span range of the center clamping device according to the invention can be significantly increased again.
  • the spindle nuts can be fixed in several defined relative positions with respect to the clamping jaws by means of positioning or locking bolts provided on the clamping jaws, it is preferred that it is visible from the outside whether the positioning or locking bolts are engaged or not. he doesn't. This can prevent incorrect tensioning and damage to the center clamping device caused by tension when the positioning or locking bolts are not correctly inserted or engaged.
  • the clamping jaws each consist of a base jaw, which is displaceably arranged on the base body along linear guides, and an top jaw, which is attached to the base jaw and is in contact with it when clamping a workpiece clamped workpiece is formed.
  • the areas of the clamping jaws that come into contact with the workpiece, namely the top jaws can be designed either as soft or hard jaws or as shaped jaws tailored to a specific workpiece.
  • top jaws are snapped onto the base jaws and, in particular, can be mounted and dismantled without tools. This means that no additional components are required, which could get lost.
  • top jaws When using top jaws, it is also preferred that the top jaws form a defined positive fit with the base jaws in both clamping directions of the center clamping device, in particular in the form of dovetail stops for both clamping directions. In this way, the top jaws can be used both for removal can be used for internal clamping as well as for internal clamping, even with a 180° twisted arrangement of the base jaws, as described above.
  • the top jaws have clamping screws by means of which they can be clamped in the dovetail stops, the clamping screws on the base jaws each being supported in recesses in the stop surface of the dovetail stop, which is not active in this clamping direction. This ensures that the top jaws are firmly seated on the dovetail stops of the base jaws, regardless of the clamping forces.
  • the base jaws have supporting projections which protrude towards the other clamping jaw in the direction of displacement of the respective clamping jaw and support or support the top jaws when clamping a workpiece internally with the center clamping device. can support.
  • These support projections are arranged in a crenellated manner on the base jaws at intervals and offset from one another in such a way that the support projections of a first of the base jaws can move into the distances between the support projections of the other base jaw when the base jaws move together and vice versa. In this way, effective support of the top jaws can be achieved during internal clamping and at the same time it can be prevented that the support projections lead to a significant limitation of the minimum span of the center clamping device.
  • the center clamping device comprises a central axial bearing for the threaded spindle, which is fixed between the clamping jaws on the base body, wherein the axial bearing can be fixed in different relative positions on the base body in the direction of displacement of the clamping jaws.
  • the center clamping device is brought into a state in which the fixation between the axial bearing of the threaded spindle and the base body is temporarily canceled so that the axial bearing can be moved in the direction of displacement of the clamping jaws on the base body.
  • Temporary stops are also installed for the two clamping jaws of the center clamping device, which limit their displacement path in one of the two displacement directions.
  • the two clamping jaws of the center clamping device are then clamped against the stops by rotating the threaded spindle, whereby the axial bearing of the threaded spindle is positioned relative to the base body. In this position, the axial bearing of the threaded spindle is then fixed to the base body and then the stops for the two clamping jaws are removed again.
  • Fig. 1 a perspective top view of a center clamping device according to the invention
  • Fig. 2 is a side view of the center clamping device from FIG. 1 ;
  • Fig. 3 shows a representation like Fig. 2 with one half of the center clamping device shown in section;
  • Figures 4a to 4c show side views of the center clamping device from Figure 1 with different settings regarding the span range;
  • Figures 5a to 5c are representations like Figures 4a to 4c with clamping jaws rotated through 180°;
  • Fig. 6 shows a section through one of the clamping jaws in the upper area.
  • Figure 1 shows a perspective top view of a center clamping device 1 according to the invention for a machine tool
  • Figure 2 shows a side view of the center clamping device from Figure 1, but with a setting for a different span range than shown in Figure 1.
  • Fig. 3 shows a representation like Fig. 2 with one half of the center clamping device shown in section.
  • the center clamping device 1 has a base body 2, on which two clamping jaws 4, 5 are displaceably arranged along linear guides 3.
  • the clamping jaws 4, 5 are each formed from a base jaw 4, which is arranged on the base body 2, and an attachment jaw 5, which is attached to the base jaw 4 and is in contact with the clamped workpiece when clamping a workpiece.
  • the top jaws 5 are snapped onto the base jaws 4.
  • the center clamping device 1 further comprises a threaded spindle 6 with two spindle nuts 7, for moving the two clamping jaws 4, 5 relative to one another along the linear guides 3 in the displacement direction S by rotating the threaded spindle 6.
  • the threaded spindle 6 has a central axial bearing 13, which between the clamping jaws 4, 5 on the base body 2 is xed, wherein the axial bearing 13 can be fixed in different relative positions on the base body 2 in the displacement direction S of the clamping jaws 4, 5.
  • the spindle nuts 7 are formed separately from the clamping jaws 4, 5 and each of the spindle nuts 7 is accommodated in a guide 8 within one of the two base jaws 4, within which they are positioned by means of two positioning bolts (not visible) provided by the respective base jaw 4. the effect of which can be temporarily canceled by pressing assigned operating buttons 9, is fixed in its relative position with respect to the respective clamping jaw 4, 5.
  • the positioning bolts engage from opposite sides radially to the axis of rotation of the threaded spindle 6 under spring pressure, each into one of three positioning openings 15 arranged at certain distances from one another in the spindle nut 6.
  • the relative position between the spindle nut 7 and the base jaw 4 is in the displacement direction S of the clamping jaw 4, 5 by moving the clamping nut 7 can be changed within the guide 8, and a total of three different relative positions between the spindle nut 7 and the clamping jaw 4, 5 in the displacement direction S of the clamping jaw 4, 5 can be adjusted and fixed by inserting the positioning bolts into other positioning openings 15 on the spindle nut 7. So there are three different relative positions between the clamping jaws 4, 5 and the spindle nuts 7 in the displacement direction S of the clamping jaws that can be adjusted in fixed stages, without tools.
  • the actuation buttons 9 are designed in such a way that when the positioning bolts are inserted as intended, they are flush with the outer surface of the respective base jaw 4 and can be used to extend the position. Nier pins must be pressed inwards from the positioning openings 15 against a spring force. If a spindle nut 7 is in an intermediate position in the guide 8 in the base jaw 4, in which the positioning pins cannot engage in any of the positioning openings 15, the actuation buttons 9 remain in their pressed positions. This makes it clear from the outside whether the positioning bolts are being used as intended. are engaged or not.
  • Figures 4a, 4b and 4c show side views of the center clamping device 1 with the three different adjustable relative positions between the spindle nuts 7 and the clamping jaws 4, 5, with Fig. 4a shows the setting with the smallest span range, Fig. 4b (which is identical to Fig. 2) shows the setting with a medium span range and Fig. 4c the setting with the largest range.
  • Fig. 4a shows the setting with the smallest span range
  • Fig. 4b (which is identical to Fig. 2) shows the setting with a medium span range
  • Fig. 4c the setting with the largest range.
  • the reference numbers have not been entered again here. These can be freely derived from Figures 1 to 3.
  • the positioning openings 15 on the spindle nuts 7 are spaced apart from one another in such a way that the span ranges resulting from the three defined relative positions between the spindle nuts 7 and the clamping jaws 4, 5 overlap.
  • the spindle nuts 7 point in the direction of the axis of rotation of the threaded spindle 6 or seen in the displacement direction S of the clamping jaws 4, 5, the shape of a polygon, and the guides 8 in the clamping jaws 4, 5 have a complementary shape, so that a rotational positive connection in both directions of rotation of the threaded spindle 6 between the spindle nuts 7 and the clamping jaws 4, 5 is present and the positioning bolts 9 do not have to absorb any related forces.
  • the relative positions between the spindle nuts 7 and the base jaws 4 in the displacement direction S of the clamping jaws 4, 5 can be changed by moving the spindle nuts 7 within the guides 8, and it can be done by retracting the positioning bolts into the Positioning openings 15 on the spindle nuts 7 also allow a total of three different relative positions between the spindle nuts 7 and the clamping jaws 4, 5 to be set and fixed in the displacement direction S of the clamping jaws 4, 5. So even with the clamping jaws 4, 5 rotated by 180 °, three different relative positions between the clamping jaws 4, 5 and the spindle nuts 7 can be adjusted in the direction of displacement S of the clamping jaws in fixed steps, without tools.
  • the positioning openings 15 on the spindle nuts 7 are spaced apart from one another in such a way that the span ranges resulting from the three defined relative positions between the spindle nuts 7 and the clamping jaws 4, 5 also overlap and there is also an overlap with the span ranges, which are at non-twisted arrangement of the clamping jaws 4, 5 as shown in Figures 4a to 4c at the respective defined relative positions.
  • Fig. 6 shows a section through one of the clamping jaws 4, 5 in the upper area shows, the base jaws 4 and the top jaws 5 are designed such that the top jaws 5 form a defined positive fit with the base jaws 4 in both clamping directions S of the center clamping device 1, in the form of dovetail stops 10 for both clamping directions S.
  • the top jaws 5 have clamping screws 11, by means of which they are clamped in the dovetail stops 10, the clamping screws 11 on the base jaws 4 each being supported in recesses in the stop surface of the dovetail stop 10, which is not active in this clamping direction.
  • the base jaws 4 of the center clamping device 1 have support projections 12, which protrude in the direction of displacement S of the respective clamping jaw 4, 5 towards the other clamping jaw 4, 5 and support or support the top jaws 5 when internally clamping a workpiece with the center clamping device 1. can support.
  • these support projections 12 on the base jaws 4 are arranged at intervals and offset from one another in such a way that the support projections 12 of a first of the base jaws 4 can enter the distances between the support projections 12 of the other base jaw 4 when the base jaws 4 move together and vice versa .
  • the center clamping device 1 To determine the relative position of the axial bearing 13 of the threaded spindle 6 with respect to the base body 2, the center clamping device 1 is brought into a state in which the fixation between the axial bearing 13 of the threaded spindle 6 and the base body 2 is temporarily canceled, so that the axial bearing 13 the clamping jaws 4, 5 can be displaced on the base body 2 in the displacement direction S.
  • stops 14 see cut left half of FIG. 3 for the two clamping jaws 4, 5 of the center clamping device 1 are temporarily attached to the base body 2, which limit their displacement path towards each other.
  • the two clamping jaws 4, 5 of the center clamping device 1 are then clamped against the stops 14 by rotating the threaded spindle 6, whereby the axial bearing 13 of the threaded spindle 6 is positioned relative to the base body 2. In this position, the axial bearing 13 of the threaded spindle 6 is then fixed to the base body 2 and then the stops 14 for the two clamping jaws 4, 5 are removed again.

Landscapes

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

Abstract

L'invention concerne un dispositif de serrage central (1) pour maintenir par serrage des pièces à usiner. Le dispositif comprend un corps principal (2), deux mâchoires de serrage (4, 5) qui sont agencées de manière mobile sur le corps principal (2) le long de guides linéaires (3) et servent à maintenir par serrage la pièce, et une broche filetée (6) pourvue de deux écrous de broche (7), pour déplacer les deux mâchoires de serrage (4, 5) l'une par rapport à l'autre le long des guides linéaires (3) par rotation de la broche filetée (6). Les écrous de broche (7) sont formés séparément des mâchoires de serrage (4, 5), et chacun des écrous de broche (7) est affecté précisément à l'une des deux mâchoires de serrage (4, 5). Selon l'invention, différentes positions relatives entre les mâchoires de serrage (4, 5) et les écrous de broche (7) peuvent être réglées dans la direction de déplacement des mâchoires de serrage (4, 5) de sorte que, sans changer les positions relatives des écrous de broche (7) sur la broche filetée (6), on peut obtenir diverses largeurs de serrage. Il est ainsi possible de diviser une grande plage de largeurs de serrage voulue en plusieurs petites sous-plages de largeurs de serrage et de raccourcir considérablement la broche filetée (6), ce qui permet de réaliser des dispositifs de serrage central très compacts (1) présentant de grandes plages de largeurs de serrage, et d'améliorer ainsi considérablement l'accessibilité pendant l'usinage des pièces.
EP22735416.4A 2022-06-24 2022-06-24 Dispositif de serrage central pour maintenir par serrage des pièces à usiner Pending EP4543631A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2022/067447 WO2023247057A1 (fr) 2022-06-24 2022-06-24 Dispositif de serrage central pour maintenir par serrage des pièces à usiner

Publications (1)

Publication Number Publication Date
EP4543631A1 true EP4543631A1 (fr) 2025-04-30

Family

ID=82321593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22735416.4A Pending EP4543631A1 (fr) 2022-06-24 2022-06-24 Dispositif de serrage central pour maintenir par serrage des pièces à usiner

Country Status (2)

Country Link
EP (1) EP4543631A1 (fr)
WO (1) WO2023247057A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013105694A1 (de) * 2013-06-03 2014-12-04 Klaus Hofmann Spannvorrichtung, insbesondere Spannmodul
DE102014110352B3 (de) * 2014-07-23 2015-10-08 Gressel Ag Zentrisch-Spannvorrichtung
DE102015220810B3 (de) * 2015-10-23 2017-03-02 Spreitzer GmbH & Co. KG Spannstock

Also Published As

Publication number Publication date
WO2023247057A1 (fr) 2023-12-28

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