EP3774140A1 - Clamping jaws, clamping insert and chuck - Google Patents
Clamping jaws, clamping insert and chuckInfo
- Publication number
- EP3774140A1 EP3774140A1 EP20717798.1A EP20717798A EP3774140A1 EP 3774140 A1 EP3774140 A1 EP 3774140A1 EP 20717798 A EP20717798 A EP 20717798A EP 3774140 A1 EP3774140 A1 EP 3774140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clamping
- jaw
- clamping jaw
- sensor
- 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
Links
- 238000005452 bending Methods 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013481 data capture Methods 0.000 description 1
- 238000011157 data evaluation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
- B23B31/1627—Details of the jaws
- B23B31/16279—Fixation on the master jaw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders
- B23Q17/005—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders by measuring a force, a pressure or a deformation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/26—Detection of clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/128—Sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
- B23B2270/06—Use of elastic deformation
Definitions
- the invention relates to a clamping jaw for a chuck, with a
- Jaw body on which at least one jaw step is formed with a T-shaped step head formed by two lateral grooves for holding a clamping insert that can be inserted into the lateral grooves.
- the invention also relates to a clamping insert and a chuck.
- the clamping force of a clamping device such as a chuck is subject to various disturbance variables during operation, namely in particular centrifugal forces, effective friction or wear. Therefore, despite the known actuating force, the clamping force acting on the tool or workpiece to be clamped is never exactly known, which is disadvantageous with regard to the operation of the
- Clamping device as insufficient clamping force can lead to the clamped object being thrown away. Furthermore, the processing accuracy can suffer, since too high a clamping force can lead to deformation and, in case of doubt, too low a clamping force does not guarantee the position security.
- a threaded hole is provided in the carrier jaw, which is used to receive a locking screw, which with its head secures the interchangeable jaw against the carrier jaw.
- the threaded hole is in a stage of
- the invention is based on the object of designing a clamping jaw of the type mentioned at the beginning in such a way that the clamping force actually acting can be precisely determined.
- the object of the invention is furthermore to provide a clamping insert which promotes a more precise measurement of the clamping force and to provide an improved chuck.
- the part of the task relating to the clamping jaw is achieved in a clamping jaw of the type mentioned in that the outside leg of the T-shaped step head is designed as a bending beam with a sensor location on the outside for the arrangement of a sensor. It is therefore possible that the sensor provided for detecting the clamping force is arranged directly at the clamping point and the acting clamping force can be measured there, without the falsifications that occur in
- Measurements in the power transmission chain are closer to the location of the generation of the actuation force. It is also important that the sensor is on the outside leg of the T-shaped one, which is designed as a bending beam
- Stepped head is positioned, since a defined bend occurs when a workpiece or a tool is clamped, as a result of which the top of the contact surface is stretched, from which the acting clamping force can be determined directly.
- a slot is formed below the T-shaped step head in order to enable a homogeneous flow of force with a force acting uniformly on the bending beam.
- the sensor point is formed from a pocket in which the sensor is arranged.
- the formation of the pocket in the bending beam has the effect that the power transmission chain is introduced from the clamping insert via the edge area of the outside leg into the stepped head of the clamping jaw, which promotes the longitudinal expansion on the side of the bending beam facing the clamping insert and thus measuring the effective clamping force more easily can be.
- a passage opening into the pocket is formed in the jaw step for the passage of a data line and / or a power supply line. It is necessary that the measured value recorded by the sensor is also evaluated accordingly and the
- Machine control can be made available to ensure the required security, including the data line and the
- Energy supply lines are provided, which can be guided through the passage, which is preferably designed as a bore, from the area of the pocket into regions of the clamping jaw that are remote from the pocket.
- the senor is designed as a strain gauge, in particular if the strain gauge is formed as a metal strain gauge that is welded into the pocket with arranged over the passage
- the pocket that receives the sensor is closed by a cover, which can preferably only be removed by destroying it.
- the sensor can be formed by a pressure sensor element consisting of a ring with an attached thin-walled membrane that carries the measuring structure.
- the clamping jaw For a broader range of application of the clamping jaw, it is advantageous if several jaw steps are formed on the jaw body and / or the jaw body is designed as a step reversal jaw.
- This makes it possible to clamp a wide variety of objects in a simple manner, both in internal clamping and in external clamping, whereby the diameter of the workpiece or tool to be clamped can vary within wide limits, since a quick diameter adjustment is possible due to the multiple jaw step, without the detection of the clamping force losing accuracy, since each jaw step has the design with the sensor assigned to the bending beam, that is to say, in the case of a clamping jaw with several jaw steps, correspondingly more
- Cross-section is compressed at through voltage.
- Jaw body a first receptacle for an electronics housing is provided, which is connected to the pocket via the passage, and that a second receptacle for an energy store is provided in the jaw body, which is connected to the pocket via the passage.
- the clamping jaw is thus designed as a self-sufficient unit that can also be completely replaced in a simple manner. It should be noted that the
- Electronics housing in particular also accommodates the corresponding components for detecting the clamping force and forwarding, namely in particular a carrier board with a microprocessor, connections for supplying and evaluating the strain gauge and additional sensors, for example for detecting the speed and / or temperature.
- evaluation and / or transmission electronics can be assigned to the housing in order to convert the data recorded by the sensor as raw data or to make it available wirelessly to the machine control of a machine tool in a correspondingly prepared manner.
- the energy supply for this is provided by the energy store, which is usually formed by a rechargeable battery, that is, an accumulator.
- the arrangement of a first receptacle and second receptacle is variable and based on space requirements.
- the design is made so that the grooves inclined and / or bores for receiving bolts for the step head
- Workpiece support are formed.
- the inclination of the grooves causes a pull-down as soon as a workpiece or a tool is clamped with the clamping insert, while precise positioning is made possible by the bolt for the workpiece support.
- Guide strips is inserted into the lateral grooves, which has a counter pocket on the side opposite the pocket, including the
- Design of the clamping insert promotes a force transmission to the outside leg of the bending beam at its edge areas in order to achieve greater deflection.
- the part of the object relating to the clamping insert is achieved by a clamping insert in which a counter-pocket is formed on the inside of the base arm centrally between the side arm, the dimensions of which are matched to those of the pocket.
- FIG. 1 shows a perspective illustration of a chuck with a workpiece clamped in external clamping, with a workpiece that is symbolically shown and can be assigned to the machine tool
- FIG. 2 shows a representation of the chuck corresponding to FIG. 1, shown without the workpiece
- FIG. 3 shows a representation of the chuck corresponding to FIG. 1 with the workpiece clamped in internal clamping
- FIG. 4 shows a representation of the chuck without the workpiece corresponding to FIG.
- FIG. 5 shows a representation corresponding to FIG. 2 with the representation in FIG.
- FIG. 6 shows a plan view of the chuck with the workpiece clamped in external clamping according to FIG. 1,
- FIG. 7 shows the section VII-VII from FIG. 6,
- Clamping jaw, 9 shows a view of an isolated clamping jaw alignment from the direction of the arrow IX from FIG. 10,
- FIG. 11 shows the section XI-XI from FIG. 7
- FIG. 12 shows the detail XII from FIG. 11
- FIG. 13 shows a representation corresponding to FIG. 10 with a different one
- FIG. 14 shows a perspective view of the clamping jaw from FIG. 13;
- FIG. 15 shows a clamping jaw optimized for through voltage for the application of the pressure bolt principle,
- FIG. 16 shows a representation corresponding to FIG. 13 with a
- FIG. 17 shows a pressure sensor made from a ring with an attached
- a chuck 1 which has a chuck body 2, in the radial evenly distributed over the circumference
- Jaw guides 3 clamping jaws 4 are arranged. In the embodiment shown, three radial jaw guides 3 with correspondingly inserted three clamping jaws 4 are shown, but with a different number of radial jaw guides 3 with associated clamping jaws 4 is also possible, in particular a chuck 1 with two
- the chuck 1 is assigned in normal use to the work spindle of a machine tool, the machine tool providing the rotating drive of the chuck 1 and providing the actuating force for
- the receiving unit 5 shown in FIG. 1 is generally part of the machine tool for receiving data to be transmitted wirelessly from the clamping jaws 4 inserted in the chuck 1.
- the clamping jaws 4 themselves are shown in detail in Figure 8 and have a jaw body 6 on which at least one jaw step 7 is formed, with a T-shaped step head 9 formed by two lateral grooves 8 for folding one insertable into the lateral grooves
- Clamping insert 10 In the exemplary embodiment shown, three of the jaw steps 7 are shown, whereby a different number is also possible here, i.e. a clamping jaw 4 with only one jaw step 7, with two jaw steps 7 or with four or five jaw steps 7 can be implemented can, depending on the requirements of the required clamping ratios.
- the grooves 8 on the step head 9 are designed inclined to a
- bores 11 for receiving bolts 12 or pins for the workpiece support are also formed on the stepped head 9.
- the jaw body 6 of the clamping jaw 4 is designed as a stepped reversible jaw, that is, in a simple manner, a change between the external clamping shown in FIG. 1 to that from the Figure 3 apparent internal tension by simply turning the
- FIG. 14 shows a clamping jaw 4, which is optimized with regard to its suitability for the through voltage with an alternative clamping insert 10 with a strain gauge 18 which is inserted laterally in a receptacle 32 and together with the loaded cross-section in the manner of
- outside leg 13 of the T-shaped step head 9 is designed as a bending beam 14, with a sensor point 15 for the
- the sensor point 15 is formed from a pocket 17 in which the sensor 16 is arranged.
- the sensor 16 itself is formed as a strain gauge 18, in particular a metal strain gauge, which is welded into the pocket 17, the contacting surfaces being arranged over a passage 19 which is provided for the passage of a data line and / or a power supply line.
- a slot 20 is formed below the T-shaped step head 19.
- FIGS. 16 and 17 An alternative with regard to the design of the sensor is shown in FIGS. 16 and 17 with a pressure sensor element 33, which consists of a ring 34 with a thin-walled 35 that carries the measuring structure.
- FIG. 8 shows the three jaw stages 7 shown assigned
- the clamping inserts 10 are secured by securing means, in particular at least one each Screw secured against being thrown out in the event that no
- Bending bar 14 the outside leg 13 of the T-shaped stepped head 9 forming the bending bar 14 is bent in a defined manner, namely stretched, which also acts on the metal strain gauges 18, which causes a change in resistance or tension proportional to the tension force acting.
- the slot 20 below the T-shaped step head 9 causes an undisturbed, homogeneous flow of force.
- a cover 25 which is preferably only removed destructively.
- a first receptacle 26 for an electronics housing 27 is provided in the jaw body 6, which is connected to the pocket 17 via the passage 19, and that in the jaw body 6 a second receptacle 28 for a
- FIG. 13 shows the possibility of interchanging the arrangement of the first and second receptacles 26, 28 and, in particular, of forming the first receptacle 26 in the area of the toothing.
- the data captured by the metal strain gauge 18 can thus be fed to the electronics housing 27, in which the required electronic components for data capture and evaluation are accommodated, the raw data or processed data from the sensor 16 being made available without contact via the receiving unit 5 of the machine tool will.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019109856.4A DE102019109856B4 (en) | 2019-04-15 | 2019-04-15 | Clamping jaw, clamping insert and chuck |
PCT/EP2020/059084 WO2020212132A1 (en) | 2019-04-15 | 2020-03-31 | Clamping jaws, clamping insert and chuck |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3774140A1 true EP3774140A1 (en) | 2021-02-17 |
Family
ID=70228003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20717798.1A Pending EP3774140A1 (en) | 2019-04-15 | 2020-03-31 | Clamping jaws, clamping insert and chuck |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3774140A1 (en) |
DE (2) | DE102019109856B4 (en) |
WO (1) | WO2020212132A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021107492A1 (en) | 2021-03-25 | 2022-09-29 | Röhm Gmbh | clamping jaw |
DE102021107499A1 (en) | 2021-03-25 | 2022-09-29 | Röhm Gmbh | CLAMPING JAW, CHUCK AND MACHINE TOOL |
DE102021107489A1 (en) | 2021-03-25 | 2022-09-29 | Röhm Gmbh | clamping jaw and chuck |
DE102021107493A1 (en) | 2021-03-25 | 2022-09-29 | Röhm Gmbh | Method for reducing the energy requirement in a clamping device and clamping means for and machine tool with such a clamping device |
CN113649836B (en) * | 2021-08-30 | 2022-08-23 | 深圳市日昭自动化设备有限公司 | Annular thin-walled part clamp of sweeping robot |
CN113977321B (en) * | 2021-11-26 | 2023-04-25 | 晶澳(无锡)光伏科技有限公司 | Milling fixture device |
DE102022131722A1 (en) | 2022-11-30 | 2024-06-06 | Röhm Gmbh | Clamping jaw, clamping insert and chuck |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4546988A (en) * | 1983-08-05 | 1985-10-15 | The S-P Manufacturing Corporation | Chuck top jaw with removable insert |
DE3512929C2 (en) * | 1985-04-11 | 1987-03-12 | Rudi 4018 Langenfeld Kirst | Clamping jaw |
DE102010039608A1 (en) * | 2010-07-26 | 2012-01-26 | Illinois Tool Works Inc. | Power-operated chuck for a tool spindle of a machine tool |
DE202013104141U1 (en) | 2013-09-11 | 2014-12-12 | Schunk Gmbh & Co. Kg Spann- Und Greiftechnik | The jaw assembly |
DE102014104285A1 (en) * | 2014-03-27 | 2015-10-01 | Röhm Gmbh | chuck |
DE102017121286C5 (en) | 2017-09-14 | 2023-06-22 | Schunk Gmbh & Co. Kg Spann- Und Greiftechnik | clamping jaw |
-
2019
- 2019-04-15 DE DE102019109856.4A patent/DE102019109856B4/en active Active
-
2020
- 2020-03-31 DE DE202020106061.9U patent/DE202020106061U1/en active Active
- 2020-03-31 WO PCT/EP2020/059084 patent/WO2020212132A1/en unknown
- 2020-03-31 EP EP20717798.1A patent/EP3774140A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020212132A1 (en) | 2020-10-22 |
DE202020106061U1 (en) | 2020-11-26 |
DE102019109856A1 (en) | 2020-10-15 |
DE102019109856B4 (en) | 2024-01-25 |
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